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1
Yang, Jie, Jingang Wang, Ruixi Luo, Can Gao, Li Songnong, and Zhou Kongjun. "Simulation Test System of Non-Contact D-dot Voltage Transformer." International Journal of Emerging Electric Power Systems 17, no. 2 (2016): 91–99. http://dx.doi.org/10.1515/ijeeps-2015-0193.
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Abstract The development trend of future voltage transformer in smart grid is non-contact measurement, miniaturization and intellectualization. This paper proposes one simulation test system of non-contact D-dot transformer for voltage measurement. This simulation test system consists of D-dot transformer, signal processing circuit and ground PC port. D-dot transformer realizes the indirect voltage measurement by measuring the change rate of electric displacement vector, a non-contact means (He et al. 2004, Principles and experiments of voltage transformer based on self-integrating D-dot probe. Proc CSEE 2014;15:2445–51). Specific to the characteristics of D-dot transformer signals, signal processing circuits with strong resistance to interference and distortion-free amplified sensor output signal are designed. WIFI wireless network is used to transmit the voltage detection to LabVIEW-based ground collection port and LabVIEW technology is adopted for signal reception, data processing and analysis and other functions. Finally, a test platform is established to simulate the performance of the whole test system of single-phase voltage transformer. Test results indicate that this voltage transformer has sound real-time performance, high accuracy and fast response speed and the simulation test system is stable and reliable and can be a new prototype of voltage transformers.
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Živanović, Dragan, Milan Simić, Zivko Kokolanski, Dragan Denić, and Vladimir Dimcev. "Generation of Long-time Complex Signals for Testing the Instruments for Detection of Voltage Quality Disturbances." Measurement Science Review 18, no. 2 (2018): 41–51. http://dx.doi.org/10.1515/msr-2018-0007.
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Abstract Software supported procedure for generation of long-time complex test sentences, suitable for testing the instruments for detection of standard voltage quality (VQ) disturbances is presented in this paper. This solution for test signal generation includes significant improvements of computer-based signal generator presented and described in the previously published paper [1]. The generator is based on virtual instrumentation software for defining the basic signal parameters, data acquisition card NI 6343, and power amplifier for amplification of output voltage level to the nominal RMS voltage value of 230 V. Definition of basic signal parameters in LabVIEW application software is supported using Script files, which allows simple repetition of specific test signals and combination of more different test sequences in the complex composite test waveform. The basic advantage of this generator compared to the similar solutions for signal generation is the possibility for long-time test sequence generation according to predefined complex test scenarios, including various combinations of VQ disturbances defined in accordance with the European standard EN50160. Experimental verification of the presented signal generator capability is performed by testing the commercial power quality analyzer Fluke 435 Series II. In this paper are shown some characteristic complex test signals with various disturbances and logged data obtained from the tested power quality analyzer.
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Wei, Dexin, Chongyou Wu, Lan Jiang, Gang Wang, and Hui Chen. "Design and Test of Sensor for Monitoring Corn Cleaning Loss." Agriculture 13, no. 3 (2023): 663. http://dx.doi.org/10.3390/agriculture13030663.
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At present, Chinese corn grain harvesters lack cleaning loss monitoring. Cleaning parameters cannot be automatically adjusted, and the loss rate is high. In view of the above problems, a cleaning loss monitoring sensor is designed, composed of a metal impact plate, piezoelectric ceramic and signal processing circuit. The factors affecting the characteristics of vibration signals are analyzed from the material, size and other aspects. The sensitive plate is composed of a 304 stainless steel impact plate and piezoelectric ceramic. The sensitive plate can convert the vibration signal of the impact plate into a voltage signal, and the output voltage range can reach ±3 V or more. The signal generated by the collision of corn kernel and damaged corn cob with the sensitive plate was analyzed.It was found that the frequency domain range of corn grains was wider, with signals above 6 kHz, but broken corncobs did not have such signals. Based on the frequency distribution, a signal processing circuit is designed, which consists of high-pass filter circuit, an envelope detection circuit, and a voltage comparison circuit. The circuit can convert analog signals into pulse signals, which facilitates the counting process by the microprocessor. In order to obtain the monitoring accuracy and installation parameters of the integrated corn cleaning loss monitoring sensor, a Central Composite Design was carried out with the installation height and angle of the sensitive plate as the test factors and monitoring accuracy as the test index. Based on the test results and field test conditions, a regression model was established to determine the optimal installation parameters: the installation angle of the sensitive plate is 30°, and the installation height is 30 cm. At this stage, the accuracy of the sensor monitoring corn grains was 92.82%, and the accuracy of monitoring the mixture of corn grains and broken corncobs was 90.07%. The verification test shows that the monitoring accuracy can reach more than 94% after the sensor is debugged. This research can provide a reference for the design of corn cleaning loss monitoring devices.
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Li, Linao, and Xinlao Wei. "Power Interference Suppression Method for Measuring Partial Discharges under Pulse Square Voltage Conditions." Energies 15, no. 9 (2022): 3437. http://dx.doi.org/10.3390/en15093437.
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Partial discharge (PD) is an important metric for the insulation diagnosis of power equipment. However, its detection is affected by the strong electromagnetic interference generated by pulse square voltage. We therefore propose a power interference suppression method for partial discharges under pulse square voltage based on a quadratic measurement method. We conduct analysis of the topology circuit when partial discharge occurs in the insulation test sample and introduce the basic principle of the secondary measurement method according to the superposition principle and the linear relationship between the square voltages at different peak values. We verify the feasibility of this method by simulating a PD signal with power interference. Subsequently, we use the successive interception comparison method to solve the non-correspondence of the two initial measurement points problem and design and manufacture the transformer turn-to-turn oil-paper insulation test sample and experimental tank. By measuring the PD starting voltage of the insulation test sample under the power frequency voltage, we determined the first measurement voltage under the pulse square voltage and obtained the signal x1(t) to subsequently measure the PD signal x2(t). According to the proposed successive interception comparison method, the signal x1(t) is processed, and the secondary measurement method suppresses the power interference of the measured signal x2(t). We demonstrate that the proposed method effectively suppresses the power interference in PD detection under a pulse square voltage.
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Vučković, Mladen, Vladimir Popović, Djura Oros, Veran Vasić, and Darko Marčetić. "Low Voltage Induction Motor Traction Drive Self-Commissioning Technique with the Advanced Measured Signal Processing Procedure." Energies 14, no. 6 (2021): 1700. http://dx.doi.org/10.3390/en14061700.
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In this paper, the enhanced auto-tuning technique based on the injection of two sinusoidal test signals of different frequencies applicable on the low voltage induction motor self-commissioning process is presented. The main feature of the proposed technique resides in the advanced signal processing of measured IM voltage and current signals based on the cascaded delay signal cancelation structure. This processing algorithm enables the filtering of the symmetry-related fundamental harmonic from the non-symmetrical test signal excitation typical for the self-commissioning process. Based upon the steady-state response from the proposed filtering block, the simple yet effective calculation method derives the complete parameter set of the IM equivalent circuit. The technique is validated through the variety of computer simulations and experimental tests on the digitally controlled low voltage IM traction drive.
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Yang, Jing Gang, Yong Yong Jia, Zhi Cheng Zhou, and Jun Hao Li. "The Measurement System of Partial Discharge under Impulse Voltage." Applied Mechanics and Materials 543-547 (March 2014): 1046–49. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.1046.
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Partial discharge (PD) is the important detection parameter for power equipment, with the development of high voltage test technology, PD detection under impulse voltage is more attention. In order to detect the partial discharge signal under the impulse voltage, this paper designs a high-frequency current sensor and broadband measurement impedance. A set of partial discharge measurement system under impulse voltage is built up. The frequency characteristics of current sensor and measurement impedance are detected. In order to test the measurement system, the PD signals of a needle defect under impulse voltage is detected, the test results show that the PD measurement system can detect the PD signals effectively.
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Li, Zhi Jian, Xiao Li Zhao, Qiu Sheng Liu, and Jing Bin Wang. "The Study on the Test Model about the Electromagnetic Inductive Communicating Signal Quality." Advanced Materials Research 834-836 (October 2013): 1055–60. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1055.
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The article analyzes the quality checkout methods of different signals, carrying on the concrete analysis at the concrete characteristic about the signal of electromagnetic inductive communicating. Analyze the quality circumstances of waveform with the input / export signal contrast, and environmental influencing factors like power supply voltage and metal environment, transmission distance and electromagnetic environment could lead to transmit without thread fail, Get a mathematical model which can directly perceived the signal quality state with the threshold value law establishment.
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Zaratuyiko, A., A. Kobozev, and I. Smilyansky. "USE OF FEATURES OF THE TRANSIENT PROCESS OF THE SIGNAL OF THE TOTAL INSTANTANEOUS POWER OF THE THREE-PHASE NETWORK FOR DETERMINATION OF THE ELECTROMAGNETIC TIME CONSTANT OR POWER FACTOR OF THE ELECTRICAL SYSTEM." Sciences of Europe, no. 146 (August 8, 2024): 47–52. https://doi.org/10.5281/zenodo.13267870.
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The features of the transient process of the signal of the total instantaneous power of three phases for quickly determining the time constant (power factor) of electrical networks are considered. The possibility of eliminating the direct input of voltage into the decision device by using a test voltage signal is shown. The structure of a microprocessor device for determining the overheating temperature of IMs during frequent starts is presented.
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Shen, Jui-Hsieh, C. M. Ettles, and H. A. Scarton. "The Analysis of Thermoelectric Signals in Metallic Sliding." Journal of Tribology 111, no. 1 (1989): 114–20. http://dx.doi.org/10.1115/1.3261860.
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The thermoelectric signal from an Alumel pin sliding over a steel surface was recorded and analyzed. The load, speed and surface topography were varied and correlations were attempted of the voltage signal against several parameters. The average temperature of the whole contact was found to agree fairly consistently with the surface temperature rise models of Blok and Archard. Of the available methods of signal analysis, the power spectrum of the voltage signal was found to give the best understanding of the micro-mechanisms of sliding, particularly when compared against the power spectra of profilometer signals. The largest component of the temperature signal was found to be caused by wavelength components equal to the extent of the contact. The correlation distance β* of the test surfaces was much less than the contact extent and contributed negligibly to the voltage signal rise.
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Zheng, Meizhu, Yanzhi Zhang, Haiyang Lv, and Chuan Xiao. "Front-End Circuit for Photomultiplier Tube Signal Readout Based on Recognition of Traffic Signal Images." Journal of Nanoelectronics and Optoelectronics 18, no. 11 (2023): 1366–73. http://dx.doi.org/10.1166/jno.2023.3516.
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Photoelectric sensing technology plays a crucial role in vehicular equipment, which is equipped with various photoelectric devices to perceive the surrounding environment and avoid traffic lights and vehicles. This research selects the Hamamatsu H9500, a 256-channel, position-sensitive photomultiplier tube, as the test unit. It aims to simplify signal readout while improving the spatial resolution of the photodetector. This research focuses on designing a charge distribution circuit named Discretized Positioning Circuit (DPC) for the photomultiplier tube, with an additional charge-sensitive front-end amplification and shaping circuit. This circuit can convert the weak current signals from the H9500 into voltage signals. The shaping part of the circuit employs an active CR-RC circuit with weak signal amplification capabilities. This circuit is deployed within the photomultiplier tube, strategically positioned on vehicles to recognize various traffic sign images. The front-end shaping circuit is tested in the experiments, which converts square wave voltage into pulse current using a capacitor. It is observed that the current signal has a certain width and the voltage waveform of the CR differential circuit can be obtained by increasing the input impedance to 1 MΩ. During input voltage amplitude testing, the corrected output signal voltage shows a good linear relationship with the input square wave voltage. This designed front-end shaping circuit is used for signal readout in photomultiplier tubes and deployed in vehicular equipment to collect image information of traffic signs. After image processing, satisfactory recognition results are achieved.
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Saribulut, Lutfu, and Arman Ameen. "Voltage Sag Detection and Compensation Signal Extraction for Power Quality Mitigation Devices." Energies 16, no. 16 (2023): 5999. http://dx.doi.org/10.3390/en16165999.
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The importance of voltage quality is continuously increasing in electrical networks due to the rising manufacturing costs resulting from system faults and disturbances in utility dynamics. Researchers generally prefer reference-frame transformation-based methods to detect and mitigate these disturbances. However, these methods are adversely affected during unbalanced loading and disturbances due to their direct dependence on system dynamics (currents and voltages). In this study, a new and simple method based on Clarke transformation is proposed to detect disturbances and generate compensation signals for Power Quality Mitigation Devices. The aim is to address the deficiencies of existing approaches. Firstly, the Clarke transformation is introduced through the vector presentation. Then, the mathematical derivation of the proposed method is provided to enhance readers’ understanding. The voltage sag detection and compensation signal extraction of its control algorithm for a Dynamic Voltage Restorer is illustrated graphically. Subsequently, a simple power system is created using a simulation program. Balanced and unbalanced voltage disturbances are applied to the test system to demonstrate the validation of the proposed method under distorted system conditions. The results of voltage sag detection and compensation signal extraction for both the proposed and existing methods are compared at the end of the case studies.
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Sun, Rong Xia, Xiao Ning Sun, and Shuo Nan Wang. "The Design of the Solar Panels Automatic Tracking Controller." Advanced Materials Research 953-954 (June 2014): 123–27. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.123.
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In this paper, the design is with the single chip microcomputer as the core of automatic tracking controller. The system is mainly composed of the signal acquisition part, the signal conditioning part, a control circuit and a drive circuit. The signal collection circuit composed of photosensitive resistance sensors to collect light signal, signal conversion circuit with voltage follower LM324 convert the change of light intensity to the change of the voltage, through the voltage comparator LM393 produce high and low level control stepping motor rotation; Control circuit use the AT89S52 as the main control device, output different control signals to the driving circuit; Driving circuit use the ULN2003 as driver stepper motor. Is obtained by simulation debugging, physical test, the error rate is less than 5%, in order to realize the efficient utilization of solar energy.
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Fauziah, Sulaiman, Santa Salmia, and Folly Eldy Elnetthra. "The Optimum Distance of Lift-Off Height on Different Test Material's Thickness by using Eddy Current Testing Technique." International Journal of Engineering and Advanced Technology (IJEAT) 10, no. 1 (2020): 125–28. https://doi.org/10.35940/ijeat.A1705.1010120.
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The Eddy current testing (ECT) technique is one of the non-destructive testing (NDT) techniques which is sensitive to the unintended signal such as lift-off (LO) height effect. The output voltage of signal defects with different thicknesses of test materials (i.e., Copper, Brass and Magnesium Alloy) can be determined from the optimum distance of LO height of the ECT technique. Previously, an established frequency was determined for these particular materials (i.e., Copper = (5.00-5.25) MHz, Brass = (4.75-5.25)MHz and Magnesium Alloy= (4.75-5.00)MHz). The frequency then generated the established voltage signal of the ECT technique. The acquired optimum distance of LO height for these materials is approximately 2mm. The findings from this established technique indicated that the determined optimum distance of LO height can find the output voltage signal of the defects as well as to detect the thicknesses.
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Zhang, Jia Yin, Tao Dong, Kai Ying Wang, Yan Su, and Yong He. "Infrared Biosensor Test System under Pulsed Bias Voltage." Applied Mechanics and Materials 411-414 (September 2013): 1539–45. http://dx.doi.org/10.4028/www.scientific.net/amm.411-414.1539.
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Infrared biosensor has been a hot area of research for several years in infrared field. This paper proposes a method to test infrared biosensor array which is not bonding with ROIC. The presented ROIC-less infrared biosensor is encapsulated in a vacuum chip scale packaging, and we design the off-chip “ROIC” in order to read out signal of infrared biosensor. It is necessary to apply bias voltage on pixels when infrared biosensor works, we gave a simulation of infrared biosensor in pulsed bias votage mode according to the infrared biosensor heat balance equation. Based on the simulation result, we have implemented the test system for ROIC-less and small-scale infrared biosensor array. We use FPGA as main controller to readout the infrared signal and transfer the data to PC via USB interface.
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Zhou, Qin Ling. "The Study on Electric Parameters Automatic Test System." Applied Mechanics and Materials 416-417 (September 2013): 1068–71. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.1068.
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Based on a digital signal processor hardware and the wavelet transform theory the next generation of electri'cal parameters automatic test system is designed. The current and voltage signal measurement relative error is not more than 0.2%, the power factor and harmonic content measurement error is not more than 1.1%, and frequency signal measurement error is less than 0.1% by this system.
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Tang, Xiao-Bin, and Masayoshi Tachibana. "A BIST Scheme for Bootstrapped Switches." Electronics 10, no. 14 (2021): 1661. http://dx.doi.org/10.3390/electronics10141661.
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This paper proposes a built-in self-test (BIST) scheme for detecting catastrophic faults in bootstrapped switches. The clock signal and the gate voltage of the sampling MOS transistor are taken as the observation signals in the proposed BIST scheme. Usually, the gate voltage of the sampling MOS transistor is greater than or equal to the supply voltage when the switch is turn on, and such a voltage is not suitable for observation. To solve this problem, a low power supply voltage is provided for the bootstrapped switch to obtain a suitable observation voltage. The proposed BIST scheme and the circuit under test (CUT) are realized with transistor level. The proposed BIST scheme was simulated by HSPICE. The simulated fault coverage is approximately 87.9% with 66 test circuits.
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Rakov, I. A. "Test signal for calibrating meters of linearly varying voltage parameters." Measurement Techniques 31, no. 7 (1988): 683–86. http://dx.doi.org/10.1007/bf00866665.
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Wu, Chao, Wei Ming Liang, Xu Nian Lai, and Fen Liu. "Initialization Time Test and Analysis about the Control Unit of Fuel Cell Vehicle." Applied Mechanics and Materials 419 (October 2013): 505–10. http://dx.doi.org/10.4028/www.scientific.net/amm.419.505.
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The paper introduces the test process of the initialization time of the control unit of Fuel cell vehicle (FCV), including connecting to the high-voltage power supply speedily, connecting to the high-voltage power supply with normal steps, and correspondent vehicle testing and hardware in the loop (HIL) bench testing. By analyzing the hard-wired signal such as key location data from data collection device and by analyzing vehicle CAN signal, the test obtained the general initialization time of each control unit and their correspondent systems, and the time needed for speedy connection to high-voltage power supply, and sorted out the determining negative factor of speedy high-voltage connection. This test could obtain implicit system parameters, which might be referred to when improving vehicle properties.
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Peng, Haojie, Hongwei Liu, Kuo Shang, Gaoyue Li, and Liping Zhao. "Design and Simulation Test of Non-Contact Voltage Sensor." Sensors 25, no. 10 (2025): 3118. https://doi.org/10.3390/s25103118.
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The miniaturization of sensors and non-contact measurement techniques is currently at the forefront of smart grid development. This paper proposes a miniature voltage sensor whose size is significantly reduced while maintaining large bandwidth and high linearity. To minimize the impact of environmental factors on measurement accuracy, a differential structure is utilized to optimize the sensor. The sensor is designed with a dual-channel measurement mode for both high-frequency and power-frequency signals, addressing issues of signal refraction and reflection due to impedance mismatch. COMSOL Multiphysics 6.2 is employed to simulate the sensor’s structural design and placement. Moreover, the experimental analysis of key parameters, such as parallel resistance and capacitance, identifies the optimal parameter combination for low-voltage distribution lines and cables of 10 kV and below. Experiments show that the voltage sensor’s bandwidth ranges from 30 Hz–200 kHz when measured through a frequency response analyzer. Finally, through the measurement carried out on the overhead line and cable, we evaluate the linearity of the sensor according to the experimental data. Specifically, the nonlinear errors of the voltage measurement for the overhead line and cable are 0.62% and 0.57%, respectively.
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Cao, Wen Lun, Bei Chen, and Yu Yao He. "The Software Design of Inverter Test System Based on VC and NI Controls." Key Engineering Materials 467-469 (February 2011): 2002–6. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.2002.
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The I/O performance test system of inverter is designed. ADlink PCI board and signal regulating panel are core of hardware platform. The software uses the mixed programs, that is, the graph control of Labview and Microsoft Visual C++. Based on the eight analog inputs, two analog outputs, three digital inputs and four digital outputs provided with specific application, we fulfill the following assignments: the dynamic monitoring of three-phase input current/voltage, DC-bus voltage and actual rotation speed, curve drawing and data storage. The computer could give the enable signal and analog speed of inverter, besides the failures are read and displayed. Finally the harmonic analysis and the balance analysis of three-phase current/voltage are realized.
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ZHANG, MIAO, YI SHEN, XIAO-LEI ZHANG, ZHI-BO WANG, and YE ZHANG. "BUILT-IN TEST SIGNAL FEATURE EXTRACTION METHOD BASED ON HILBERT–HUANG TRANSFORM." Advances in Adaptive Data Analysis 04, no. 01n02 (2012): 1250005. http://dx.doi.org/10.1142/s1793536912500057.
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This work proposes a feature extraction method from Hilbert–Huang-transform- or HHT-based data analysis of built-in test (BIT) signals, which are sampled on-site and without reference signals for fault diagnosis. The proposed method fully utilizes self-adaptation of the HHT method in characterizing the envelope amplitude and instantaneous frequency for the intrinsic mode function (IMF), so as to single out the features with most irregular characteristics. Simulations are carried out on steering gear feedback voltage signal of target drone aircraft, and the extracted features show great potential for the improvement in built-in fault diagnosis.
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Liu, Chang, Shiwu Yang, Yong Cui, and Jiaqi Lv. "Quantitative analysis on coupling of traction current into cab signaling in electrified railways." Railway Engineering Science 28, no. 3 (2020): 275–89. http://dx.doi.org/10.1007/s40534-020-00220-z.
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Abstract Cab signaling apparatus is the critical equipment for ground-vehicle communication in electrified railways. With the rapid development of high-speed and heavy-haul railways, the immunity to unbalanced traction current interference for cab signaling apparatus in the onboard train control system is increasingly demanded. This paper analyzes the interference coupling mechanism of the ZPW-2000 track circuit. Based on electromagnetic field theory and the actual working parameters, a calculation model is established to complete the quantitative research of the cab signal induction process and traction current interference. Then, a finite element model is built to simulate the process. The simulation results under the signal frequency, fundamental and harmonic interference are all consistent with the theoretical calculation results. The practical measurement data verify the coupling relationship between cab signal inductive voltage and rail current. Finally, an indirect immunity test method applying this relation for the cab signals is proposed, and the voltage indexes of the disturbance sources are determined, i.e., the test limits. The results provide an accurate quantitative basis for the cab signaling research and design of the immunity test platform; besides, the proposed indirect test method can simplify the test configuration and improve test efficiency.
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Jeong, Seong-Min, Seokmoo Hong, and Jong-Seok Oh. "A New Fracture Detection Algorithm of Low Amplitude Acoustic Emission Signal Based on Kalman Filter-Ripple Voltage." Sensors 21, no. 12 (2021): 4247. http://dx.doi.org/10.3390/s21124247.
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In this study, an acoustic emission (AE) sensor was utilized to predict fractures that occur in a product during the sheet metal forming process. An AE activity was analyzed, presuming that AE occurs when plastic deformation and fracturing of metallic materials occur. For the analysis, a threshold voltage is set to distinguish the AE signal from the ripple voltage signal and noise. If the amplitude of the AE signal is small, it is difficult to distinguish the AE signal from the ripple voltage signal and the noise signal. Hence, there is a limitation in predicting fractures using the AE sensor. To overcome this limitation, the Kalman filter was used in this study to remove the ripple voltage signal and noise signal and then analyze the activity. However, it was difficult to filter out the ripple voltage signal using a conventional low-pass filter or Kalman filter because the ripple voltage signal is a high-frequency component governed by the switch-mode of the power supply. Therefore, a Kalman filter that has a low Kalman gain was designed to extract only the ripple voltage signal. Based on the KF-RV algorithm, the measured ripple voltage and noise signal were reduced by 97.3% on average. Subsequently, the AE signal was extracted appropriately using the difference between the measured value and the extracted ripple voltage signal. The activity of the extracted AE signal was analyzed using the ring-down count among various AE parameters to determine if there was a fracture in the test specimen.
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Zhang, Ying, Jiachen Zeng, Zhuang Jiang, and Kun Yu. "Research on Traveling Wave Detection Performance Based on Optical Voltage Transformer." Journal of Physics: Conference Series 2479, no. 1 (2023): 012049. http://dx.doi.org/10.1088/1742-6596/2479/1/012049.
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Abstract Traditional transformers cannot effectively transmit high-frequency traveling wave signals, which leads to the fact that traditional voltage transformers cannot fully reflect the panoramic information of fault traveling waves and ensure fault location accuracy. This paper mainly analyzes the working principle of optical voltage transformers. The Jones matrix models the optical path system and its optical components, and the output model of the optical path system is obtained. The principle of photoelectric signal conversion is analyzed. The test principle, experimental method, and data results are studied and analyzed by power frequency, withstand voltage, lightning impulse, and arc tests. The transmission effect of fault traveling wave signal is verified, which provides the theoretical and experimental basis for the fault location of the distribution network.
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Yan, Biao, Li Zhou, Jie Chen, Feng Bo Tao, and Jian Zhang. "Testing and Diagnosis of Extra High Voltage Power Cables Using Damped AC Voltages Combined with Distributed Partial Discharge Measurement." Advanced Materials Research 1070-1072 (December 2014): 1039–43. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1039.
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State assessment method of cables with extruded insulation and their accessories, DAC withstand test combined with a diagnostic test (such as PD measurement) has two shortcomings, the output voltage is not high enough for EHV cables, it cannot detect and locate PD effectively when defects are far away from signal acquisition point. This paper focus on DAC voltages up to 250kV and a kind of distributed measurement of PD. Defects existing in arbitrary of tested cable can be accurately measured in theory by installing sensor at intervals along the tested cable. This method has been validated on a long extra high voltage cross-linked polyethylene (XLPE) insulated underground cable circuit and the filed PD test has been completed successfully.
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Tian, Jin Ming, Lei Zhang, Cheng Long Gong, and Lin Hai Ji. "Design of Three Voltage Level Test System for Auto Sensor Based on LabVIEW." Applied Mechanics and Materials 130-134 (October 2011): 4147–51. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.4147.
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A set of data acquisition terminal for automotive sensor three voltage level signal performance testing is designed. It is connected together to form a complete set of automotive sensor performance test monitoring system using NI-6259 data acquisition card and PC data collection terminal. The system can display real-time maximum, minimum and average of high voltage level, middle and low, duty cycle, frequency, and flipping or not. The measured signal frequency range is 1Hz~2.5 KHz. The measured data and the specified range of data interface is contrasted, automatically determined whether it is reasonable, and classified saved.
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Thuc, Vu Cong, and Han Soo Lee. "Partial Discharge (PD) Signal Detection and Isolation on High Voltage Equipment Using Improved Complete EEMD Method." Energies 15, no. 16 (2022): 5819. http://dx.doi.org/10.3390/en15165819.
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Electricity has a crucial function in contemporary civilization. The power grid must be stable to ensure the efficiency and dependability of electrical equipment. This implies that the high-voltage equipment at the substation must be reliably operated. As a result, the appropriate and dependable use of systems to monitor the operating status of high-voltage electrical equipment has recently gained attention. Partial discharge (PD) analysis is one of the most promising solutions for monitoring and diagnosing potential problems in insulation systems. Noise is a major challenge in diagnosing and detecting defects when using this measurement. This study aims to denoise PD signals using a data decomposition method, improved complete ensemble empirical mode decomposition with adaptive noise algorithm, combined with statistical significance test to increase noise reduction efficiency and to derive and visualize the Hilbert spectrum of the input signal in time-frequency domain after filtering the noise. In the PD signal analysis, both artificial and experimental signals were used as input signals in the decomposition method. For these signals, this study has yielded significant improvement in the denoising and the PD detecting process indicated by statistical measures. Thus, the signal decomposition by using the proposed method is proven to be a useful tool for diagnosing the PD on high voltage equipment.
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Fu, Li, and Xiu Wei Fu. "Design of the Portable Detector for Formaldehyde." Advanced Materials Research 989-994 (July 2014): 615–18. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.615.
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The design of the portable formaldehyde detector based electrochemical sensors with microcontroller is introduced in the paper .In conducting the test, the formaldehyde-containing gas diffusion to the sensor internal to react with the internal electrolyte and generates a weak current signal, the current signal through the working circuit is converted to a voltage signal, the voltage signal via the signal processing circuit, and it is collected and processed by MCU after input to the A/D. the signal is communicated with operator through the buttons and LCD.
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Jin, Bo, Lijun Zhao, and Shiqiang Zhu. "A Breakage-Stop System for Linen Wet Spinning Frame." Open Electrical & Electronic Engineering Journal 8, no. 1 (2014): 159–69. http://dx.doi.org/10.2174/1874129001408010159.
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A multi-way control system for spun yarn breakage detecting and tow stopping is presented for linen wet spinning frame upgrade in medium-sized businesses of southeastern China. The signals from periodic rotations of spun yarns are picked by piezoelectric sensors. After input protection and multiplexers, the weak voltage signal from gated channel is processed through links including voltage following, passive high-pass filter, active low-pass filter, in-phase and reversedphase proportional amplifying, precision full-wave rectification, retardation voltage comparison, etc.. After regulated at a zener diode link, the final electrical level is sent to LPC2132 processor which gives trigger signals to actuators when yarn breakage is detected. In the corresponding actuator channel, armature of electromagnet will be pushed off to stop tow feed and the red LED will be lightened to warn spinner. Circuit board units for signal amplifying, conditioning and actuator driving were designed for controlling 24 yarn channels simultaneously. The simulation result and field test verified the circuit accuracy and programmed effectiveness.
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Živanović, Dragan, Milan Simić, Dragan Denić, and Živko Kokolanski. "SCRIPT FILES APPROACH IN THE POWER QUALITY EVENTS GENERATION." Facta Universitatis, Series: Automatic Control and Robotics 17, no. 2 (2018): 93. http://dx.doi.org/10.22190/fuacr1802093z.
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Generation of typical power quality (PQ) events, based on Script files and virtual instrumentation, is presented in this paper. Such approach provides definition and generation of three-phase voltage signals with various PQ events defined according to relevant international quality standards. Using of Script files enables easy and flexible generation of long-time voltage signals with complex PQ disturbances, according to the predefined test algorithms and scenarios. Detailed front panels and block diagrams of developed virtual instrument for signal generation are described in the paper. As specific examples, generated signals defined using the Script files are presented. Experimental confirmation of described software supported method is performed using the three-phase PQ analyzer Fluke 435. Some specific test waveforms and obtained experimental results are shown.
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Severo, Lucas Compassi, and Wilhelmus Adrianus Maria Van Noije. "A Generic Test Board for the Electrical Characterization of ULP and ULV Fully-Differential Integrated Analog Circuits." Journal of Integrated Circuits and Systems 14, no. 3 (2019): 1–7. http://dx.doi.org/10.29292/jics.v14i3.90.
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The characterization of ultra-low power (ULP) fully-differential/balanced amplifiers and active filters is challenging due to the incompatibility with the classical single-ended (SE) and 50 Ω impedance equipment. Interface circuits between the device under test (DUT) and the equipment are needed to perform the signal conversion and to work as voltage buffers. In this work, we propose a generic test circuits to be used in the characterization of ULP and ultra-low voltage (ULV) analog circuits. The test board includes balun transformers to the signal conversion, a high input impedance and low capacitance output driver and voltage regulators to provide the target DUT supply voltage. The characterization of the proposed PCB demonstrates a bandwidth of 30 MHz, output driver input impedance of 5 MΩ with 2.5 pF capacitance and low input-referred noise. The proposed circuit was applied to the electrical characterization of two fully-differential ULV and ULP analog integrated circuits.
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Cao, Aisong. "Pulse eddy current testing of corrosion defects in pipelines with insulation layer based on U-shaped sensors." Journal of Physics: Conference Series 2897, no. 1 (2024): 012054. https://doi.org/10.1088/1742-6596/2897/1/012054.
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Abstract In response to the insufficient detection ability of CUI in pipelines, based on U-shaped sensors, combined with the wide spectrum and non-contact characteristics of pulse eddy current detection technology, the area and depth of corrosion defects on the outer wall of pipelines can be effectively detected without removing the insulation. Simulation and experimental research are conducted on the outer wall defects of carbon steel test tubes with insulation layers. The simulation results show that the excitation magnetic field generated by the U-shaped sensor can effectively penetrate the inner wall of the pipeline, and the two signal-receiving coils of the U-shaped sensor will generate significant characteristic signals when passing through defects. The detection voltage position curve is obtained by applying the voltage distribution analysis method, and the characteristic signal length is the defect length. The experimental results show that when the detection sensor passes through and leaves the defect, the detection voltage distribution curve will generate a significant voltage drop characteristic signal, and the distance between the measurement points is consistent with the length of the defect. The experimental results are highly consistent with the simulation results.
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Nazarychev, A. N., D. A. Polkoshnikov, A. S. Strakhov, E. M. Novoselov, M. A. Zakharov, and A. A. Skorobogatov. "Study of the external magnetic field signal of an asynchronous electric motor in run-down mode." Vestnik IGEU, no. 3 (June 30, 2024): 46–54. http://dx.doi.org/10.17588/2072-2672.2024.3.046-054.
Full textAbstract:
Currently, one of the important scientific tasks is the development and improvement of methods for non-destructive testing of asynchronous electric motors during operation. One of the promising areas of diagnostics is the use of an external magnetic field signal. However, its study in the run-down mode is not given due attention by the authors of scientific publications, despite a number of advantages of this signal. Therefore, the aim of this research is to confirm the possibility to record and study the signal of the radial component of the induction of the external magnetic field in the run-down mode of an asynchronous motor. So, the aim is relevant. The research is carried out using several test benches, real low-voltage and high-voltage asynchronous motors and a simulation model of an asynchronous electric motor designed in the Ansys software package. To process the signals, namely, to construct the frequency-time spectra of the external magnetic field in the run-down mode, the authors have used a program based on the Short Time Fourier Transform using the Flat-top window as a window function to more accurately determine the amplitudes of the harmonic components. During the research conducted on test benches, it has been found that the external magnetic field of the motor in the run-down mode will exist due to the phenomenon of residual magnetization. The possibility of modeling asynchronous motors considering residual magnetization has been proven and the reliability of the resulting model has been confirmed. The spectra of external magnetic field signals on real motors and simulation models in the run-down mode are presented. The external magnetic field signal in the run-down mode can be recorded both on simulation models and on real low-voltage and high-voltage asynchronous electric motors. During further research, it is planned to analyze the possibility of identifying faults in asynchronous motors using this signal.
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Yang, Yang, Yuan Bin Hu, and Wen Gang Huang. "The Analysis and Solution of a PLL Signal Source's Abnormity." Applied Mechanics and Materials 446-447 (November 2013): 971–75. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.971.
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In this paper, a kind of 120 kHz PLL signal source system is presented. Its based on the principle that changes in feedback voltage at a constant surge frequency which is related to reference voltage. At the same time, combine an actual test circumstance; the abnormity of signal lock is analyzed. Based the conclusion and the mode of interior parts, we take a simple adjust measure. The abnormity of the signal source is avoided availably.
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Yu, Ting, Xiaoli Duan, Yishi Yue, Sanwei Liu, Zeyu Zeng, and Jianjia Duan. "Research on the High Voltage Near Electric Safety Distance Alarm Device." Journal of Physics: Conference Series 2474, no. 1 (2023): 012061. http://dx.doi.org/10.1088/1742-6596/2474/1/012061.
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Abstract In the process of construction near overhead transmission lines, the safety distance between the crane, tower crane, and live wire is insufficient, which leads to the tripping of lines. It not only causes huge economic losses, but also endangers human life safety. In order to avoid the car accidentally touching live wire, this paper studies a high voltage near electric safety distance alarm device, and introduces the structure and working principle of the device. The voltage signal is measured by the test to reflect the distance between the vehicle and the live wire. The measured voltage signal data is processed and compared with the alarm voltage signal threshold. According to different voltage levels and distances, the high voltage near electric safety distance alarm device can realize voice alarm and remind operators to pay attention to keep a safe distance.
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Lee, Jeong Ki, Dong Man Suh, and Seung Seok Lee. "Change of the Pulsed Eddy Current Signals by the Variation of the Thickness of an Aluminum Specimen." Key Engineering Materials 297-300 (November 2005): 2028–33. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2028.
Full textAbstract:
The conventional eddy current testing uses a sinusoidal signal with very narrow frequency bandwidth. Whereas, the pulsed eddy current method uses a pulse signal with a broad frequency bandwidth. This allows multi-frequency eddy current testing, and the penetration depth is greater than that of the conventional eddy current testing. In this work, the pulsed eddy current instrument was developed for evaluating the metal loss. The developed instrument was consist of the pulse generator generating the square pulse of maximum 40 V, the amplifier controlled to 52dB, the A/D converter of 16bit 20MHz, and the industrial personal computer for operating with Windows program. And, the probe for the pulsed eddy current was designed as the pancake type in which the sensing coil was located in the driving coil. The peak voltage did not linearly increase with the voltage of the step pulse. For the driving coil with inductance of 670µH, the peak voltage linearly increased with the step pulse voltage to 30V. But, for the other driving coils with the inductance of 1.7mH, 2.7mH, 3.6mH, 22mH, the peak voltage linearly increased with the step pulse voltage to 20V. The output signals of the sensing coil rapidly increased when the step pulse driving voltage was off, and the latter part of the sensing coil output voltage exponentially decreased with a time. The decrement value of the output signals of sensing coil increased with the thickness of the aluminum test piece.
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Yan, Song, Xiaoming Zhang, Kai Ma, and Yang Su. "Test method for opening and closing time of 500kV high voltage circuit breaker under double terminal grounding condition." Journal of Physics: Conference Series 2087, no. 1 (2021): 012019. http://dx.doi.org/10.1088/1742-6596/2087/1/012019.
Full textAbstract:
Abstract The opening and closing time test of 500kV high voltage circuit breaker can evaluate the mechanical characteristics and three-phase synchronization performance of the circuit breaker. Due to the influence of the earth resistance circuit, the traditional test method of circuit breaker opening and closing time can not be carried out when both ends are grounded. This paper first introduces the differential coil used to collect the signal, and then according to the requirements of field test, puts forward a test method for the opening and closing time of circuit breaker under the condition of double terminal grounding, and gives the basis for judging the opening and closing signal time. Finally, it compares and analyses the results of this method with the traditional high voltage circuit breaker opening and closing time test method, and obtains the conclusion of high voltage circuit breaker. The test method of grounding time division and closing time at both ends of the circuit breaker can fully meet the needs of field maintenance, which provides a new idea for the opening and closing time test of 500kV high voltage circuit breaker.
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Sireesha, T., та K. Krishna Murthy. "Comparative Assessment on Linearity Test based V2π and Vπ/2 Voltage Variations of Closed Loop IFOG". International Journal of Electrical and Computer Engineering (IJECE) 6, № 2 (2016): 583. http://dx.doi.org/10.11591/ijece.v6i2.8809.
Full textAbstract:
Interferometric Fiber Optic Gyroscope (IFOG) has to operate in closed loop condition to achieve inertial grade performance. The closed loop system is mainly depends upon the amplitude of the ramp signal (V2π of IOC) and bias (square wave) signal frequency (f<sub>bias</sub>). The digital phase ramp function is given as feedback to the optical system and makes gyro to null condition. The peak-to-peak amplitude (Vπ/2) of biasing signal is one-fourth of the ramp amplitude (V2π). If there are any variations in the amplitude of the ramp and biasing signals, then it introduces variations in the gyro performance. In this paper, a comparative discussion made in the gyro parameters for three cases: (i) V2π (vary) &amp; Vπ/2 (constant), (ii) Vπ/2 (vary) &amp; V2π (constant) and (iii) both V2π and Vπ/2 are varying simultaneously. The effects on gyroscope are described with the derived values in terms of linearity. From the experimental results, it was observed that the gyro output is very sensitive with respect to V2π variations and obtained the percentage error of 10% in gyro output, but very less effect due to Vπ/2 variations. So, the proper resetting of ramp voltage (V2π) is required to avoid nonlinearities and instabilities in gyro output.
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Sireesha, T., та K. Krishna Murthy. "Comparative Assessment on Linearity Test based V2π and Vπ/2 Voltage Variations of Closed Loop IFOG". International Journal of Electrical and Computer Engineering (IJECE) 6, № 2 (2016): 583. http://dx.doi.org/10.11591/ijece.v6i2.pp583-595.
Full textAbstract:
Interferometric Fiber Optic Gyroscope (IFOG) has to operate in closed loop condition to achieve inertial grade performance. The closed loop system is mainly depends upon the amplitude of the ramp signal (V2π of IOC) and bias (square wave) signal frequency (f<sub>bias</sub>). The digital phase ramp function is given as feedback to the optical system and makes gyro to null condition. The peak-to-peak amplitude (Vπ/2) of biasing signal is one-fourth of the ramp amplitude (V2π). If there are any variations in the amplitude of the ramp and biasing signals, then it introduces variations in the gyro performance. In this paper, a comparative discussion made in the gyro parameters for three cases: (i) V2π (vary) &amp; Vπ/2 (constant), (ii) Vπ/2 (vary) &amp; V2π (constant) and (iii) both V2π and Vπ/2 are varying simultaneously. The effects on gyroscope are described with the derived values in terms of linearity. From the experimental results, it was observed that the gyro output is very sensitive with respect to V2π variations and obtained the percentage error of 10% in gyro output, but very less effect due to Vπ/2 variations. So, the proper resetting of ramp voltage (V2π) is required to avoid nonlinearities and instabilities in gyro output.
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Wang, Shu Chen, Hsiao Chen Lee, and Chi Jui Wu. "Signal Detection Technology for Low Voltage Arc Fault Circuit Interrupter Using FPGA." Applied Mechanics and Materials 376 (August 2013): 451–54. http://dx.doi.org/10.4028/www.scientific.net/amm.376.451.
Full textAbstract:
This paper is studying the low voltage arc fault circuit interrupters (AFCI) based on FPGA Signal detection. The arc fault generator is designed to generate artificial low voltage series arc faults. The AFCI signal detection circuits are tested by using the measured voltage and current waveforms from the testing circuits. It is expect to develop high performance signal detection circuits and the key component using in AFCI. Finally, the experimental data with serial arc faults are used to test the detecting methods and compare with the commercial devices. The purposed detecting methods can effectively detect the occurring of series arc faults, and the probability of malfunction is low.
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Lei, Yang. "Array Sensor Output Signal Detection System Signal Conditioning Circuit Design." Journal of Physics: Conference Series 2452, no. 1 (2023): 012033. http://dx.doi.org/10.1088/1742-6596/2452/1/012033.
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Abstract The signal output by the array sensor is generally very weak, with a large dynamic range and a wide range of signal frequencies. In order to solve the problem of accurate measurement of weak signals with wide frequency and large dynamic range, this paper proposes a design method of sub-band filtering and variable gain amplifying circuit based on the analog switch, divides the signal into four frequency bands, and designs four groups of second-order voltage control filter, and adjust the magnification for different frequency signals, and only need to switch the corresponding resistance and capacitance to realize the switching of signal processing circuits of different frequency bands, which greatly optimizes the circuit structure. In order to reduce the interference in the transmission process, a single-ended differential circuit is designed to transmit the processed signal to the subsequent acquisition system for acquisition. After the simulation test, the signal conditioning circuit can effectively improve the signal-to-noise ratio of the detection signal and improve the measurement accuracy.
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Wu, Chang Zhong. "An Online-Monitoring System of Machine Tool Cutting Force." Applied Mechanics and Materials 155-156 (February 2012): 658–62. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.658.
Full textAbstract:
Use the piezoelectronic sensor to test the signal then use the charge amplifier to amplify it,after several amplification ,the weak charge signal is amplified into voltage signal,after that convert the analog signal into dagital signal by the data acquisition board,then input the data into a computer,signal real-time collection and dynamic display can be achieved on the computer.Signal processing process disposes and analyzes the collected signal further,at last obtains the right cutting force signal dynamically,thus it can be used to test the monitoring system's stability and reliability
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Zhu, Jingyi, Wanlu Zhu, Haifeng Wei, and Yi Zhang. "Research on Self-Recovery Ignition Protection Circuit for High-Voltage Power Supply System Based on Improved Gray Wolf Algorithm." Energies 17, no. 24 (2024): 6332. https://doi.org/10.3390/en17246332.
Full textAbstract:
In order to solve the problems of traditional high-voltage power supply ignition protection circuits, such as non-essential start–stop power supply, a slow response speed, the system needing to be restarted manually, and so on, a high-voltage power supply system self-recovery ignition protection circuit was designed using an IGWO (improved grey wolf optimization) and PID control strategy designed to speed up the response speed, and improve the reliability and stability of the system. In high-voltage power supply operation, the firing discharge phenomenon occurs. Current transformers fire signal into a current signal through the firing voltage value and Zener diode voltage comparison to set the safety threshold; when the threshold is exceeded, the fire protection mechanism is activated, reducing the power supply voltage output to protect the high-voltage power supply system. When the ignition signal disappears, based on the IGWO-PID control of the ignition self-recovery circuit according to the feedback voltage, the DC supply voltage of the high-voltage power supply is adjusted, inhibiting the ignition discharge and, according to the ignition signal, “segmented” to restore the output of the initial voltage. MATLAB/Simulink was used to establish a system simulation model and physical platform test. The results show that the protection effect of the designed scheme is an improvement, in line with the needs of practical work.
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Khazieva, R. T., and A. N. Mukhametshin. "Development and research of the circuit for measuring the leakage current when testing the insulation with the higher rectified voltage." Power engineering: research, equipment, technology 23, no. 4 (2021): 145–55. http://dx.doi.org/10.30724/1998-9903-2021-23-4-145-155.
Full textAbstract:
OBJECT. When developing DC test voltage sources to assess the insulation quality of high-voltage equipment, the task is to measure the leakage current flowing through the test object. METHODS. When solving the problem the authors proposed a technical solution for measuring the current flowing through the test when testing insulation with rectified voltage, which uses a precision resistor, an isolating amplifier, a 2-channel operational amplifier with a unipolar power supply, zero voltage drift, and an ADC of a microcontroller.RESULTS. The article in the course of the study of the stand of the circuit for measuring the leakage current flowing through the tested object when testing the insulation with rectified voltage, an experimental industrial sample was created, which makes it possible to measure the leakage current value in the range from 10 μA to 1000 μA. The use of the developed circuit for measuring the current flowing through the test object when testing the insulation with rectified voltage makes it possible to calculate the DC component of the voltage signal from the alternating signal and in real time, and, therefore, to quickly monitor the current in high-voltage circuits for continuous monitoring. CONCLUSION. So the introduction of this sample will make it possible, on its basis, to create a number of digital measuring microammeters that make it possible to measure the leak-age current in high-voltage test installations for testing the insulation of objects from 15 nF to 200 nF, in the leakage current measurement range from 10 μA to 1000 μA. The results obtained can be used in high voltage technology to study circuits for measuring the leakage current flowing through the test object when testing insulation with rectified voltage.
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Khazieva, R. T., and A. N. Mukhametshin. "Development and research of the circuit for measuring the leakage current when testing the insulation with the higher rectified voltage." Power engineering: research, equipment, technology 23, no. 4 (2021): 145–55. http://dx.doi.org/10.30724/1998-9903-2021-23-4-145-155.
Full textAbstract:
OBJECT. When developing DC test voltage sources to assess the insulation quality of high-voltage equipment, the task is to measure the leakage current flowing through the test object. METHODS. When solving the problem the authors proposed a technical solution for measuring the current flowing through the test when testing insulation with rectified voltage, which uses a precision resistor, an isolating amplifier, a 2-channel operational amplifier with a unipolar power supply, zero voltage drift, and an ADC of a microcontroller.RESULTS. The article in the course of the study of the stand of the circuit for measuring the leakage current flowing through the tested object when testing the insulation with rectified voltage, an experimental industrial sample was created, which makes it possible to measure the leakage current value in the range from 10 μA to 1000 μA. The use of the developed circuit for measuring the current flowing through the test object when testing the insulation with rectified voltage makes it possible to calculate the DC component of the voltage signal from the alternating signal and in real time, and, therefore, to quickly monitor the current in high-voltage circuits for continuous monitoring. CONCLUSION. So the introduction of this sample will make it possible, on its basis, to create a number of digital measuring microammeters that make it possible to measure the leak-age current in high-voltage test installations for testing the insulation of objects from 15 nF to 200 nF, in the leakage current measurement range from 10 μA to 1000 μA. The results obtained can be used in high voltage technology to study circuits for measuring the leakage current flowing through the test object when testing insulation with rectified voltage.
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Xiao, Shi Wu, and Lan Lan Shu. "Damping Analysis of Subsynchronous Oscillation Caused by HVDC." Advanced Materials Research 732-733 (August 2013): 1065–68. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.1065.
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High Voltage Direct Current transmission (HVDC) will cause torsional interaction under certain conditions. Among a variety of factors, improper rectifier control has fateful effect. In the paper, the test signal method which is the time-domain form of the complex torque coefficient approach (CTC approach) is studied. Its application conditions in multi-machine systems are summarized. Using the test signal method, impacts of DC power, DC voltage, rectifier controller parameters and generator output on electrical damping characteristics in the Suizhong system are studied based on time-domain simulation model.
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Jalilzadeh, Saeid, and Shahriar Golchin. "Voltage Flicker Parameters Estimation UsingShuffled Frog Leaping Algorithm (SFLA) andImperialistic Competitive Algorithm (ICA)." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 15, no. 1 (2015): 6373–78. http://dx.doi.org/10.24297/ijct.v15i1.1714.
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Measurement of magnitude and frequency ofthe voltage flicker is very important for monitoring and controlling voltage flicker efficiently to improve the network power quality. This paper presents two new methods for measurement of flicker signal parameters using Shuffled Frog Leaping Algorithm (SFLA) and Imperialist Competitive Algorithm (ICA). This paper estimates fundamental voltage and flicker magnitudes and frequencies with proposed methods. The goal is to minimize the error ofthe estimated magnitudes and frequencies via a designed fitness function. At first we introduce voltage flicker and its measuring techniques. Then voltage flicker model is analyzed. At the next part a review of SFLA and ICA is presented these methods are applied to a test voltage signal and the results are given and analyzed.
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Yu, Liang Jun, Li Hua Sun, and Cui Cui Huang. "Design of Comprehensive Test Instrument Based on FPGA and Cortex-M0." Applied Mechanics and Materials 312 (February 2013): 583–87. http://dx.doi.org/10.4028/www.scientific.net/amm.312.583.
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The design consists of three modules: the voltage amplitude measurement module, the level oscillator module and the amplitude-frequency characteristic test module. The voltage amplitude measurement module uses AD817 to consist three-stage amplifier. The magnification of each level can be adjusted for 1 times/10 times. At the same time, the author uses the Cortex-M0 for controlling the relay switch to achieve automatic range conversion. The principle of DDS is adopted in the level oscillator module. FPGA is used for realizing the phase accumulator, the phase modulator, the sine ROM look-up table. Digital signal is finally outputted by high-speed analog-to-digital conversion chip DAC900. Then, by controlling the 6-channel relay switch to make the magnification in the amplifying circuit,which can be adjusted step-by-step from-30dB to 20dB. Through outputting sine wave whose amplitude is fixed, but frequency is variable to the network under test, amplitude-frequency characteristic test module measures the relation betthe authoren the amplitude change of the output signal and the signal frequency to obtain the amplitude-frequency characteristics of the network under test..
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Hou, Zhe, Zhi Wei Huang, Rong Xue, Chen Xi Huang, Hong Jie Li, and Sheng Chang Ji. "Novel High Voltage Switch for Damped Oscillatory Voltage Testing System." Applied Mechanics and Materials 494-495 (February 2014): 1424–27. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1424.
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This paper describes the development of a novel high voltage (HV) switch for use in the damping oscillating voltage testing system. Specialized for up to 10 kV rated XLPE partial discharge test application, the switch consists of ten identical IGBT function units in series connection and has a maximum voltage of 20 kV. To solve the synchronization problem of the gate signal, we used the optical fiber to trigger the units. A multiple isolation power-supply system is used for the drive circuit. The operation of proposed switch is tested on an equivalent specimen, confirming the feasibility of this kind of application.
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Carotenuto, Gianfranco. "A New Method to Detect Zeolite Breath Sensor Response Based on Low-Power Square-Wave Sources." European Journal of Engineering Research and Science 4, no. 10 (2019): 152–54. http://dx.doi.org/10.24018/ejers.2019.4.10.1594.
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Low-power A.C. generators of square-wave or sinusoidal signals can be used in combination with impedimetric sensors to detect stimuli on the basis of the voltage drop taking place at the sensor electrodes. When a.c. generators with a power of only a few µ-Watts are used, this approach becomes extremely sensitive. A very low-power generator is the LCD back panel driving signal, which has a flipping polarity with a voltage of 3-5Vpp, depending on the generator model. This type of square-wave generator is contained in many low-cost handheld digital multimeters, and it is used as signal tracer to test, for example, low-frequency amplifiers. As an example, this method has been used to acquire a human breath rate pattern, by using a zeolite-based water sensor. If the generator I-V characteristics has been measured, the achieved breath pattern can be converted from a voltage drop vs. time graph to an impedance or current intensity vs. time graph.