High-voltage electrode device for insulating self-recovery space charge measurement

Abstract

The invention discloses a high-voltage electrode device for insulated self-recovery type space charge measurement. The device comprises a grounding metal radome and a top cover; the upper end of the grounding metal radome is open, the grounding metal radome is internally provided with high-voltage metal electrode and filled with a liquid insulating layer, and a tested sample is placed in the grounding metal radome; and the top cover is mounted in the open end of the grounding metal radome detachably, and provided with a high-voltage DC conducting rod and a high-voltage pulse conducting rod, the high-voltage DC conducting rod is connected with the high-voltage metal electrode, a capacitor is connected between the high-voltage pulse conducting rod and the high-voltage metal electrode, and the high-voltage metal electrode, the high-voltage DC conducting rod and the high-voltage pulse conducting rod are insulated from the top cover. The high-voltage electrode device can improve the flashover level of the surface voltage of the tested sample, realizes insulated self-recovery of breakdown, reduces processing, debugging and calibrating time, and also has the advantages of high withstanding voltage, compact structure, high stability, uniform internal temperature and low cost.

Description

technical field [0001] The invention relates to the technical field of insulating material performance testing, and more particularly relates to a high-voltage electrode device for insulating self-restoring space charge measurement. Background technique [0002] After more than 30 years of development, the electroacoustic pulse method space charge measurement technology has become one of the general measurement techniques for studying the space charge characteristics of insulating materials at home and abroad. This measurement technology is mainly used to measure the distribution characteristics of space charge and electric field intensity inside insulating materials under the condition of DC electric field, to study the dynamic evolution process of space charge generation, transportation, accumulation and dissipation, and to analyze the insulating materials in combination with related physical models. The origin mechanism and migration rules of internal charges, and the inf...

AI Technical Summary

Problems solved by technology

In the actual production process of high-voltage electrode devices, the insulating resin inevitably has defects such as micro-bubbles, which will reduce the insulation performance, and partial discharge phenomenon will occur under low DC voltage, and even breakdown will occur in advance

Insulating resin is powerless against breakdown accidents caused by combined electrical-thermal-mechanical aging and insulation defects. It can only be remade, which has high cost, low efficiency, heavy workload, long processing and production cycle, and it is difficult to find out the cause of the accident.

In addition, the nanosecond-level high-voltage pulse signal is extremely sensitive to the circuit topology, and the calibration and debugging of the new high-voltage electrode device requires a lot of work

Moreover, in the space charge test process, surface flashover often occurs on the surface of the tested sample, which seriously affects the test process.

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