NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–POE Tester
Common faults and treatment during AC withstand voltage test of power cables? Common faults and treatment during AC withstand voltage test of power cables? In the power cable AC withstand voltage test of the power cable fault detection equipment manufacturer, the common fault causes and troubleshooting methods of the test device are as follows: 1. The internal temperature is too high, and the power supply components have thermal protection; troubleshooting methods: turn off the power of the instrument, let the instrument stand for about 30 minutes, turn on the power again, and press the button on the instrument panel.“reset”key to start the instrument. If you still cannot start the fan, please contact Wuhan Hezhong Electric Co., Ltd. and do not disassemble the instrument by yourself! 2.
The automatic tuning cannot be completed, and the resonance point cannot be found: Fault phenomenon: The tuning curve is completely a straight line, and the instrument prompts that there is no resonance point after the tuning is completed. Reason: poor grounding of the circuit, wrong wiring of the test circuit, open circuit of the device and instrument Troubleshooting method: 1 ) Check whether the grounding device is reliable and whether the grounding wire has a disconnection point; 1/>2) Check the continuity of the high and low voltage coils of the excitation transformer; 3) Check the continuity of each reactor; 4) Check the continuity of the signal line of the voltage divider; 5) Check the continuity of the high and low voltage capacitor arms of the voltage divider; 6) Check whether the compensation capacitor has no resonance point when the equipment is self-boosting; all components are normal, but there is still no resonance point, please contact the manufacturer, do not disassemble the instrument! Cable AC withstand voltage test device. Failure to boost the voltage to the test voltage: 1) The setting curve is a curve with a lower peak value; 2) During the test, the primary voltage is relatively high, while the high voltage is relatively low, even if the primary voltage has not risen to the test voltage, the primary voltage has reached the rated voltage , the loop is automatically depressurized; fault causes: 1) The reactor does not match the capacitance of the test product, there is no quasi-voltage, and the resonance point is determined; \2) The loss of the test product is large, and the Q value of the system is too low; 3) The high-voltage output voltage of the excitation transformer is low ;4) The high-voltage connecting line is too long or the high-voltage corona discharge line is not used; Troubleshooting methods: 1) Connect the compensation capacitor to the test loop to increase the loop capacitance; 2) Connect as many reactors as possible in series to increase the circuit inductance ; 3) Increase the output voltage of the excitation transformer; 4) Dry the test product, improve the dielectric strength of the test product, and reduce the active power loss of the circuit. Common faults and treatment during AC withstand voltage test of power cables? Manufacturer of power cable fault detection equipment.
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