Lightning impulse test system and method for electric equipment

Abstract

The invention provides a lightning impulse test system for electric equipment, which includes an impulse voltage generator, wherein a steepening circuit for secondary discharge is provided between the impulse voltage generator and the electric equipment to be tested. By setting the steepening circuit, the impulse voltage generator first charges the steepening circuit when discharging, and then conducts the lightning impulse test on the power equipment to be tested through the steepening circuit discharge. The secondary discharge technology is used, and the lead inductance of the steepening circuit is relatively high. It solves the problem that the impact of the large loop inductance in the impulse voltage generator on the wave front time and oscillation amplitude exceeds the standard.

Description

technical field [0001] The invention relates to the field of lightning impulse test of electric equipment, in particular to a lightning impulse test system and method of electric equipment. Background technique [0002] In the power system, it is generally necessary to transmit or exchange power through high voltage, which leads to the high voltage withstand function of the power equipment in the power system, and in the actual power system, most of the equipment is in the Relatively harsh environments, and due to weather and other influences, such as lightning, will also have a greater impact on electrical equipment. Therefore, there is a high requirement for lightning impact capability for electrical equipment. At the same time, how to test the lightning impact capability of electrical equipment is also very important. [0003] The equivalent circuit of the lightning impulse test system for existing power equipment is as follows: figure 1 , the impulse voltage generator...

AI Technical Summary

Problems solved by technology

In this way, the wave front time T1 is greater than 1.56μs and / or the oscillation is greater than 10%. In order to obtain a smaller wave front time (preferably meeting the standard specified range), it is inevitable to generate oscillation or overshoot at the peak of the lightning impulse

[0006] In the prior art, in order to ensure that the wave front time T1 meets the standard requirements, it is possible to reduce the wave front resistance R1, but the existence of the loop inductance L1 will cause oscillation overshoot at the peak of the shock waveform, and increasing the wave front resistance R1 will affect the oscillation overshoot It has a certain inhibitory effect. In this contradictory situation, it often occurs that the oscillation overshoot is greater than 10% in order to ensure the wave front time. Even for some products, the wave front time of the lightning shock and the oscillation overshoot even appear. Phenomena that do not meet the requirements

Although the method of connecting a capacitor in parallel to the wave front resistance R1 can improve this situation, it cannot fundamentally change the problem of the loop inductance L1

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