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Dongguan Zhongli Instrument Technology Co., Ltd., in conjunction with the School of Physics and Electronic Science of Changsha University of Science and Technology, uses a combination of high-frequency square wave pulse power supply, high-frequency current detection technology, weak signal detection and micro-control technology to improve the corona resistance of the original CVT5 enameled wire. On the basis of the tester, a PDIV automatic test system for corona-resistant enameled wire under repeated high-frequency square wave pulse conditions is designed – ZL-2701 enameled wire partial discharge and corona resistance tester, ZL-2701 enameled wire partial discharge and electricity resistance tester The corona tester can use the host computer to control the high-frequency square wave pulse power supply of the corona-resistant tester to achieve uniform and automatic voltage boosting, and at the same time collect the high-frequency instantaneous current generated by partial discharge to complete the PDIV rapid automatic test of corona-resistant enameled wires, which can efficiently , Accurately test the PDIV of corona-resistant enameled wire. Use ZL-2701 to conduct PDIV testing of enameled wire strands or wire pairs of different sizes under repeated high-frequency square wave pulses of different frequencies. Conduct a large number of tests on different samples in the same environment. The experimental results are consistent with the PDIV results using a UV spectrometer. The trend is the same.
Compliant with Standards：
GB/T 23642-2017/IEC/TS 61934:2011 “Electrical measurement of partial discharge (PD) under conditions of instantaneous rise and repeated voltage surges in electrical insulating materials and systems”
GB/T 21707-2018 “Insulation Specification for Three-Phase Asynchronous Motors Specially Used for Variable Frequency Speed Regulation”
GB/T 4074.21-2018 “Test methods for winding wires Part 21: High-frequency pulse voltage resistance performance”
The Main Technical Parameters:
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Waveform Rise Time |
≤100ns Four gears available |
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The Output Voltage |
(0-5000) V continuously adjustable |
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Output Voltage Indication Error (Vp-p) |
≤±3% (1500V～5000V) |
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Output Frequency |
2-20KHz continuously adjustable |
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Pulse Voltage Waveform |
Bipolar square wave |
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Dimensions |
Control box : 490×500×1650mm Heating host : 900×760×1650mm |
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Input Power |
AC220V±5% 50Hz |
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Voltage Stability |
≤±1% (1500V～5000V) |
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Frequency Stability |
≤±1‰ |
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Test Chamber Temperature |
Room temperature to 200℃ |
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Duty Cycle |
50% |
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Power |
4.5KW |
Test Results:
When testing using the high-frequency current method, the square wave pulse power supply starts from 400V and is stepped up to 1500V at a constant speed, the frequency is 10kHz, and the rise/fall time is 100ns. The diameter of the test sample is 1.12mm enameled wire. A 33pF high-voltage capacitor was used in the comparison test. The sampling results under different voltages are shown in the figure below. It can be seen from the figure that when the sample is a high-voltage capacitor, as the square wave pulse power supply voltage increases , the sensor output current gradually increases slowly. When the sample is an enameled wire sample, the sensor output current increases slowly with the square wave pulse power supply voltage at a lower voltage, and no partial discharge occurs at this time. The current began to increase rapidly at around 920V. At this time, partial discharge occurred, and local breakdown occurred inside the insulating medium of the enameled wire. It was determined that the partial discharge starting voltage of the enameled wire sample was 920V.
© Dongguan Zhongli Instrument Technology Co., Ltd.
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