Local discharge detection device and method for GIS

Abstract

The invention discloses a local discharge detection device and method for a GIS. The local discharge detection device comprises a supporting plate and a sensor fixing frame, an ultrasonic sensor is arranged on the sensor fixing frame, an installation rack is arranged on the supporting plate, a plurality of fixing holes are formed in the supporting plate, and the sensor fixing frame is connected with the installation rack. Connecting rods are arranged in the fixing holes, the connecting rods are slidably connected with the supporting plate, and each connecting rod is provided with a connectingblock, a limiting block and a compression spring, wherein the connecting block and the limiting block are arranged on the two opposite sides of the supporting plate, the connecting block and the ultrasonic sensor are located on the same side of the supporting plate, the compression spring is arranged on the connecting rod and located between the supporting plate and the limiting block, and the connecting block is provided with a sucker. By means of the local discharge detection device and method for the GIS, the problem about fixing of an ultrasonic detection sensor and the problem about testing of a traditional handheld sensor are mainly solved.

Description

technical field [0001] The invention relates to the field of GIS ultrasonic partial discharge detection, in particular to a GIS partial discharge detection device and method. Background technique [0002] GIS (combined electrical appliances) ultrasonic partial discharge detection is an important detection method to investigate whether there is discharge phenomenon inside GIS. State Grid Q / GDW 1168-2013 "Condition Maintenance Test Regulations for Power Transmission and Transformation Equipment" stipulates that GIS equipment conducts ultrasonic partial discharge detection on a periodic basis (the cycle is 220kV and above: 1 year; 110 (66) kV: 2 years); Zhejiang The Provincial Electric Power Company's "GIS Ultrasonic Partial Discharge On-Site Detection Guidelines (Trial)" stipulates that "a special coupling agent should be evenly applied between the sensor and the measuring point, and the sensor should be kept relatively still with the GIS shell during measurement. The method ...

AI Technical Summary

Problems solved by technology

However, when testing on site, since the instrument is not equipped with a special sensor fixing device, the staff collects partial discharge signals by holding the sensor close to the GIS shell

Due to the time-varying nature of the test signal and the coupling instability introduced by manual operation, the final collected signal amplitude is usually unstable

[0003] Fixing the hand-held sensor has the following defects: (1) The hand-held sensor will have different stability due to different techniques of the operator, resulting in unstable test results

(2) Operators who hold the sensor for a long time are prone to fatigue and deformed movements, which will lead to inaccurate test results

In order to accurately obtain the state quantity of GIS equipment, continuous measurement is required. In addition, due to the type of intermittent discharge, long-term observation is required, so manual hand-held sensor measurement cannot meet the requirements

(3) Due to the proximity to live equipment, there is a danger of inductive electric discharge for operators

The shell of the GIS is at ground potential under normal operation. If the high-voltage conductor discharges to the ground or the isolation switch operates abnormally, the shell will become a charged body or have induced electricity, which will threaten the personal safety of the staff.

(4) The height of some GIS cylinders is high or the cylinder is compact, and the operator cannot hold the sensor for testing

However, it still needs to be hand-held, and cannot solve the other problems mentioned above

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