The overvoltage protector tester is an instrument specially used to detect the power frequency discharge voltage of electrical equipment, especially for the detection of zinc oxide overvoltage protector (lightning arrester) with gap. This kind of protector uses the method of dividing the pressure of the zinc oxide valve plate with the discharge gap to reduce the residual pressure of the operating impact protection, and at the same time destroy the resonance conditions and reduce the amplitude of the resonant overvoltage. It protects against interphase overvoltages and relative ground overvoltages. 
The use of the overvoltage protector tester is relatively simple, it uses a special circuit, which can automatically judge the gap discharge and lock the effective voltage value at the moment of discharge. Before measuring, the ground wire and power cord should be connected, and the instrument output adjustment knob should be returned to zero. When the output voltage of the instrument reaches the gap discharge voltage, the instrument will automatically cut off the high-voltage output current and lock the voltmeter.
The data measured by the overvoltage protector tester is not only scientific and practical, but also reflects the quality and performance of the protector under test. For users, choosing a reliable tester can make the measurement results more accurate and reliable. Therefore, we should fully understand the function and function of the overvoltage protector tester in order to better apply it in the power system, which plays an important role in ensuring the stable operation of the power system and the safety of the equipment. At the same time, the test accuracy of the overvoltage protector tester has also been verified. The tester has a test accuracy of 05%, which is higher than the 1. required by the relevant national standards0%。This accuracy means that the overvoltage protector tester accurately reflects the state of the protector under test in the measurement, making the measurement results more reliable. Therefore, the overvoltage protector tester is a scientific, practical and high-precision testing instrument.
In addition, the overvoltage protector tester also has the characteristics of strong anti-interference ability. During the measurement process, the measurement data is not disturbed, making the measurement results more accurate and reliable. Therefore, the overvoltage protector tester is not only suitable for power systems, but also for other industrial fields.
To sum up, the overvoltage protector detector is a high-precision test instrument suitable for various industrial fields, which can accurately reflect the state of the protector under test, and has the advantages of strong anti-interference ability and high test accuracy. Therefore, the selection of an overvoltage protector tester is very important for both the power system and other industrial sectors.