An ultra-high frequency sensor for on-line monitoring of partial discharge inside a switchgear

Abstract

The invention discloses an ultra-high-frequency sensor for monitoring partial discharge in a switch cabinet online. The ultra-high-frequency sensor comprises a micro-strip slot antenna and an SMA (Sub-Miniature A) connector, wherein the micro-strip slot antenna comprises a dielectric substrate, wherein a grooved metal grounding plate is arranged on one side of the dielectric substrate, and the micro-strip slot antenna is arranged on the opposite side of the dielectric substrate; the SMA connector is electrically connected with the micro-strip slot antenna. From an overall perspective, the shape of the groove in the metal grounding plate is an inverted U shape; a detail design adopts a meander technology, and the path of exciting current on the surface of the metal grounding plate is changed by bending, so that the miniaturization of an antenna is realized. In application, the ultra-high-frequency sensor is light in weight, small in size and easy to manufacture, and is beneficial to be arranged in the switch cabinet; meanwhile, the sensitivity is high; a feed structure is simple and compact; the loss of a feed line is low. Simulation and experiments prove that the return loss of the sensor in a bandwidth range is less than -10 dB; in addition, the impedance matching with a standard 50-Ohm coaxial transmission line is effectively realized by optimizing micro-strip feed line parameters and feed positions.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of state monitoring of electric equipment, and relates to an ultra-high frequency sensor used for on-line monitoring of partial discharge inside a switch cabinet. [0003] 【Background technique】 [0004] The high-voltage switchgear is a very important electrical equipment in the power system. The defect or deterioration of the internal insulation part and the poor contact of the conductive connection part all threaten the safe operation. According to the statistics of 6-10kV switchgear accidents in the national power system from 1989 to 1992, the faults caused by insulation and current carrying accounted for 40.2% of the total, and the accidents caused by the flashover of the insulating part accounted for 79.0% of the total number of insulation accidents. [0005] The partial discharge of switchgear equipment is a key indicator to evaluate whether the health status of such equipment is good, and it is also the...

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Problems solved by technology

[0010] The purpose of the present invention is to provide an ultra-high frequency sensor for on-line monitoring of partial discharge inside the switchgear to solve the problems of low gain, narrow bandwidth, and low efficiency of the existing ultra-high frequency sensor; The ultra-high frequency sensor for on-line monitoring of partial discharge inside the switchgear has the advantages of miniaturization and high gain

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