Testing system for shunt characteristics of multi-column arrester

Abstract

A testing system for shunt characteristics of a multi-column arrester comprises a charging loop, a discharging loop and a measuring control and data analysis management system, wherein the charging loop comprises a testing power supply and energy storage units; the multilevel energy storage units are sequentially cascaded with an output end of the testing power supply; each energy storage unit comprises an energy storage capacitor C and charging protection resistors Rn connected to two ends of the energy storage capacitor correspondingly and respectively; the discharging loop comprises a discharging switch G, an energy capacitor C, a wave modulating inductor L, a wave modulating resistors R and a wave modulating resistor S; and the measuring control and data analysis management system comprises a plurality of detecting units, multichannel data acquisition (DAQ) units or multichannel oscilloscopes, a computer data processing unit and a programmable controller, and the number of the detecting units corresponds to the number of columns of the multi-column arrester or the number of groups of valve plates of the multi-column arrester. The testing system can output high-class voltage and is large in adjusting range; and by means of the protection of the charging protection resistors Rn as well as discharging isolation of other levels excluding the first level, the energy storage capacitors C have characteristics of low charging voltage and high discharging voltage.

Description

Technical field [0001] The invention relates to a high-voltage large-current pulse current system, in particular to a test system for the shunt characteristics of a multi-pillar arrester. Background technique [0002] With the rapid development of AC and DC transmission projects, metal oxide arresters are the key power equipment for overvoltage protection in the transmission system to limit the lightning overvoltages that appear in the lines and the transient overvoltages caused by various operations and faults. , Plays a vital role in the safe operation of the entire transmission line. [0003] Surge arresters generally adopt a multi-pillar parallel structure. Under lightning and operating overvoltage impacts, if the current distribution between the arresters is not uniform, it will cause aging or breakdown of a certain column, especially when operating with large energy absorption. In the case of voltage energy, the uneven shunt of the arrester will cause excessive energy absorp...

AI Technical Summary

Problems solved by technology

[0004] However, the voltage of the existing test system is relatively fixed and cannot be adjusted or the adjustment range is very small, which cannot meet the actual requirements; at the same time, there are few test data in one test, which often need to be collected separately, and the operation is cumbersome, which affects the accuracy of the test and the accuracy of the conclusion. sex

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