Switch cabinet partial discharge detection system

Abstract

The invention relates to a switch cabinet partial discharge detection system. The switch cabinet partial discharge detection system includes a handheld detection device and an ultrahigh frequency sensor built in a switch cabinet, wherein the handheld detection device and the ultrahigh frequency sensor are connected with each through a coaxial cable; the ultrahigh frequency sensor built in the switch cabinet includes an antenna radiation layer, a dielectric layer, a feed probe and a BNC cable connector; one surface of the dielectric layer is directly attached to inner wall of the switch cabinet; the shell of the switch cabinet is adopted as signal reference ground of the ultrahigh frequency sensor; the antenna radiation layer is laid on the other surface of the dielectric layer; the feed probe is vertical to and is arranged in the dielectric layer; the inner end of the feed probe is connected with the antenna radiation layer; the other end of the feed probe is connected with the inner core of the BNC cable connector which passes through a through hole in the wall of the switch cabinet from outside to inside; and the shell of the BNC cable connector is electrically connected with the switch cabinet. According to the switch cabinet partial discharge detection system of the invention, the ultrahigh frequency sensor can be installed on site conveniently and has excellent directionality. With the switch cabinet partial discharge detection system of the invention adopted, power frequency signals can be extracted from onsite lighting signals so as to be adopted as phase reference for partial discharge, and therefore, analysis on a phase where of partial discharge occurs can be realized.

Description

technical field [0001] The invention relates to a partial discharge detection system of a switch cabinet, in particular to a partial discharge detection system of a switch cabinet based on an ultra-high frequency antenna sensor built in the switch cabinet. Background technique [0002] There are always some defects inside the insulation of high-voltage electrical equipment, such as air bubble gaps, impurities, spikes, etc. Under the action of a strong electric field, the electric field distribution inside the insulation of the equipment is uneven, and the electric field intensity at the defect site increases, which easily leads to this A discharge that does not penetrate the entire insulation, that is, a partial discharge. Partial discharge generally does not cause penetrating breakdown of insulation, but it can cause local damage to the insulation medium. If it exists for a long time, it will cause damage to the electrical strength of the insulation device under certain co...

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Problems solved by technology

[0006] Application number CN2012102303160 for a Chinese invention patent application for "a built-in ultra-high frequency antenna sensor in a switchgear". The antenna sensor is composed of a radiation antenna, a dielectric layer, an air layer and a ground layer. The main disadvantage of this sensor is: the structure is relatively complicated , takes up a lot of space and is not easy to install

In addition, there is no switchgear partial discharge detection system based on the built-in switchgear UHF antenna sensor

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