Built-in pre-buried ultrahigh-frequency GIS internal partial discharge monitoring sensor

Abstract

The invention relates to a device for monitoring GIS internal partial discharge, in particular to a built-in pre-buried ultrahigh-frequency GIS internal partial discharge monitoring sensor. The sensor comprises an insulator, a guiding device and a radio-frequency connector, wherein the insulator is perpendicularly connected to the interior of a grounding shell, the circumferential portion of the insulator is connected with the cylinder wall of the shell, the edge of the insulator extends out of the shell, the guiding device comprises a high-voltage conductor and an antenna, the high-voltage conductor is arranged along the axis of the grounding shell and penetrates through the insulator, the two ends of the high-pressure conductor extend out of the insulator, the antenna is annular, the section of the antenna is in the shape of a circle or a long circle, the antenna is embedded into the insulator, one end of the radio-frequency connector is connected with the antenna, and the other end of the radio-frequency connector extends out of the edge of the antenna. The sensor has the advantages that monitoring position is flexible, monitoring range is wide, monitoring sensitivity is high, the uniform electric field of an original coaxial cylindrical structure is not changed, original insulation margin is increased, and cost is low.

Description

[0001] technical field [0002] The invention relates to a device for monitoring partial discharge inside a GIS, in particular to a built-in embedded UHF monitoring sensor for partial discharge inside a GIS. Background technique [0003] At present, the UHF method GIS internal partial discharge monitoring technology has been generally recognized, which provides a basis for early monitoring of the internal insulation status of important equipment GIS in the power system, and effectively avoids power outage losses caused by sudden insulation failures. With the continuous development of UHF technology, in order to improve the monitoring sensitivity, a method of building a partial discharge sensor is proposed. The traditional built-in method is to set a disc-shaped insulator inside the flange of the shell, and the conductive rod as the guide device passes through the insulator and the flange to connect with the RF connector on the flange. Buried in the insulator, see the Chines...

AI Technical Summary

Problems solved by technology

The traditional built-in method is to set a disc-shaped insulator inside the flange of the shell, and the conductive rod as the guide device passes through the insulator and the flange to connect with the RF connector on the flange. Buried in the insulator, see the Chinese patent with publication number 203643559U, the sensing device of this structure can filter out low-frequency signals well and reduce interference, but its setting has the following disadvantages: (1) Additional settings need to be added to the original shell The window is used for sensor installation. On the one hand, the increase of each window increases a sealing structure, which increases a possible air leakage hazard; on the other hand, each window and sensor increases the cost of more than ten thousand yuan; (2) due to It is necessary to add windows to install, and the number or density of settings will be limited. Usually, only one is set when it exceeds 10 meters. For partial discharges that occur in the middle of the two sensors, the monitoring sensitivity will decrease; (3) due to the The sensing device is set on the side of the shell, and can only receive the signal leaked through the installation window, and its monitoring range and sensitivity are limited; (4) The increase of the window makes the uniform electric field of the original coaxial cylindrical structure in the window become uneven, reducing the original insulation margin

Images