The grounding resistance testerunder UHV power can help many power workers conduct various power tests more conveniently.

DC resistance testing is a very important testing item after transformer handover, overhaul, and replacement of tap changers. It refers to the resistance of buried grounding bodies and the resistance of soil stray currents. Generally speaking, using traditional methods (bridge method and voltage drop method) to measure the DC resistance of transformer windings and high-power inductive devices is both time-consuming and laborious. Usually using a testing instrument for measurement can effectively improve product quality and prevent power accidents from occurring. It consists of a high-power switching power supply circuit, a precision small signal measurement circuit, a protection circuit, and a high-speed microcontroller control circuit. It has functions such as instrument self checking, signal measurement, data processing, rapid discharge, and printing results.

The application of grounding resistance tester is quite complex and requires scientific application based on actual environment. If the influence of external environmental factors cannot be avoided, it will affect its effectiveness. For example, in a strong electromagnetic interference environment, it may lead to command errors or protection failures. Therefore, special attention should be paid to the environmental requirements of the tester.

In short, with the increase of power system scale, the application range of grounding resistance tester is becoming wider and wider. To ensure the safe operation of the power system, more attention should be paid to testing instruments, common faults should be eliminated, and corresponding preventive measures should be taken to reduce inspection and maintenance costs, truly guarantee the continuous supply of electricity, and ensure the smooth development of social activities.