Damage caused by excessive leakage current of high-voltage arrester manufacturers and preventive measures

High-voltage arrester leakage current treatment process

(1) After the maintenance personnel first stop the capacitor and take safety measures, check the primary and secondary wiring of the current transformer, and the connections are reliable and firm; the secondary insulation resistance of the current transformer is measured, and the secondary insulation resistance is 1.2MΩ, No abnormality;

(2) Check the capacitor discharge voltage transformer, the primary and secondary wiring connections are firm, reliable and free of abnormalities;

(3) The ground insulation and interphase insulation of the telemetering capacitor are above 2000MΩ, no abnormality;

(4) Check the wiring of the high-voltage arrester and the wiring connection, the contact is good, and the insulation resistance is above 1000MΩ;

(5) Apply DC 1mA voltage u1mA to the high-voltage arrester, and the specified change range should not exceed ±5%

(6) The leakage current of 0.75u1mA shall be applied to the high-voltage arrester, and the regulations stipulate that it should not exceed 50μA

Analysis and Treatment of Excessive Leakage Current Fault of HV Arrester

According to the above test results, compared with the initial value, the DC 1mA voltage u1mA has a variation range of less than ±5%, which complies with the regulations; the leakage current of 0.75u1mA for A and B phases is less than 50μA, and the C phase exceeds the specified value, indicating that the C phase The leakage current of the zinc oxide arrester is too large. After replacing the C-phase high-voltage arrester with a qualified high-voltage arrester, the fault is eliminated.

Preventive Measures for Excessive Leakage Current of High Voltage Arrester Manufacturers

(1) Measure the leakage current under the operating voltage of the high-voltage arrester in time, and strengthen monitoring when the measured value changes significantly from the initial value;

(2) During operation, the operators should conduct inspections and inspections in place and earnestly, discover equipment abnormalities in time, and eliminate them in time to avoid the expansion of the scope of failures.

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbows, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-shaped heads, wall bushings, European cable accessories, American cable connectors, transformer neutral point protection devices, fuses, isolation switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products