A Partial Discharge Simulation Device for Metal Enclosed Combined Electric Appliances

Abstract

The invention provides a partial discharge simulator of a metal closed composite apparatus. The partial discharge simulator of the metal closed composite apparatus consists of a discharge electrode, a high-voltage bushing, a metal closed air chamber, a grounding device, an air charging and discharging device and an observation window, wherein the discharge electrode comprises a high-voltage electrode, a ground potential electrode, a high-voltage electrode fixing structure and a ground electrode fixing structure; the high-voltage sleeve comprises an interior metal conductor, an external insulating umbrella skirt, a binding post, a grading shield and a connecting flange; the metal closed air chamber comprises a four-way metal shell, an adsorbent frame, a sealing element and a port blanking plate; the grounding device comprises a movable grounding conductor, a metal shell and a position indicating device; the air charging and discharging device comprises a charge valve and an SF6 gas pressure gage; and the observation window comprises a transparent insulating cover plate and an anti-explosion guard plate. The device has the advantages of flexible simulation, convenient material selection, safety, reliability and convenience in maintenance.

Description

technical field [0001] The invention relates to the field of partial discharge simulation models, and in particular to a partial discharge simulation device for a metal-enclosed combined electrical appliance. Background technique [0002] Metal-enclosed combined electrical appliances have many advantages such as small footprint and high reliability, and are widely used in power systems. However, its internal electric field strength is very high, and it is easy to cause a decrease in insulation performance due to internal tiny defects, or even insulation breakdown, resulting in serious power supply failures. Internal defects such as poor installation and insulation aging of metal-enclosed combined electrical appliances are usually accompanied by partial discharge. Therefore, the simulation of partial discharge and the research on detection and analysis technology are the key to improving the early warning ability of equipment insulation status. At present, two methods and mo...

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Problems solved by technology

[0003] The existing two types of simulation methods and models have shortcomings and deficiencies in simulating the partial discharge of metal-enclosed combined electrical appliances

The discharge of the electrode model is highly controllable, simple and reliable, but its structure is quite different from that of the real device, which causes the transmission of the discharge signal to be distorted and affects the analysis of the signal characteristics, and the gas chamber capacity of the model is usually small, which is not conducive to SF 6 Detection of gas decomposition products

The discharge in the equipment model is similar to the real equipment, but the controllability of the discharge is poor, the actual situation of the model is invisible, the repeatability of the discharge simulation is not good, and the capacity of the gas chamber is large, which brings a lot of SF when adjusting the discharge model 6 The problem of gas recovery, the actual simulation effect is not good, and the control is difficult

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