Lightning arrester resistor disc side surface glaze leakage current test system

Abstract

The invention discloses a lightning arrester resistor disc side glaze leakage current test system. The system comprises a variable frequency power supply module, a transformer, a reactor module, a voltage divider, a peak voltmeter, a resistor disc module, a temperature module and an oscilloscope. A low-voltage side of the transformer is connected with the variable-frequency power supply module, one end of a high-voltage side of the transformer is connected with the reactor module, and another end of the high-voltage side of the transformer is connected with the voltage divider. The reactor module comprises a series reactor. One end of the peak voltmeter is connected between a high-voltage arm and a low-voltage arm of the voltage divider. The temperature module is used for providing a corresponding temperature for the test resistor. The lightning arrester resistor disc side glaze leakage current test system provided by the embodiment of the invention can effectively prevent the interference of cutoff current, the circuit topological structure is simple, and the insulation condition of a lightning arrester can be accurately reflected.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to a glaze leakage current test system on the side of a resistor sheet of a lightning arrester. Background technique [0002] The core component of the arrester is a zinc oxide resistor, and its performance will directly affect the service life and overall electrical performance of the arrester. The glaze on the side of the zinc oxide resistor is an important factor affecting its electrical performance. Generally speaking, the glaze layer is coated on the side of the resistor. Under the normal rated power frequency voltage, the arrester can be regarded as an insulator, and the current passing through the zinc oxide resistor is called the leakage current of the zinc oxide arrester. Considering the voltage Fluctuation range, the leakage is not greater than 50μA at 0.75U1mA, in principle, the smaller the better. The leakage current can reflect the insulation condition of the arreste...

AI Technical Summary

Problems solved by technology

The existing test system for the leakage current of the arrester has a complex circuit topology, which cannot simultaneously reflect the influence of temperature on the side glaze of the resistor sheet, and will be affected by the short-circuit current of the circuit, thereby affecting the calculation of the leakage current of the arrester, making the test The system can not get the correct leakage current, and then make a wrong judgment on the electrical performance of the arrester, affecting its correct use

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