Multi-parameter high-voltage bushing online monitoring device

Abstract

The invention discloses an online monitoring device for a multi-parameter high-voltage bushing. The online monitoring device comprises a bushing adapter and a four-in-one bushing oil state sensor which are connected with a bushing state acquisition unit; the bushing adapter is used for monitoring leakage current of the bushing capacitor and high-frequency pulse to-ground partial discharge current signals of the bushing capacitor; the four-in-one casing oil state sensor is used for monitoring temperature, pressure, micro-water and hydrogen content signals of insulating oil in the casing; the casing state acquisition unit is used for acquiring signals monitored by the casing adapter and the four-in-one casing oil state sensor; and the analysis processing unit is used for diagnosing and pre-judging various faults in the casing pipe based on the signals acquired by the casing pipe state acquisition unit and the multi-state quantity. According to the invention, high-voltage bushing monitoring is carried out based on multiple state quantities, bushing faults are comprehensively analyzed and diagnosed, various faults of the bushing can be accurately and timely found, early warning intervention is timely carried out, and further expansion of accidents is avoided.

Description

technical field [0001] The invention belongs to the technical field of high-voltage equipment, and in particular relates to a multi-parameter high-voltage bushing on-line monitoring device. Background technique [0002] The transformer is the core equipment of the substation, and the stable operation of the transformer is directly related to the stability of the substation and the power grid. If there are defects or faults in the high and low voltage side bushings of the transformer, it will directly endanger the safe operation of the transformer and the reliability of its power supply. [0003] In the fault statistics of transformers, the transformer bushing is the part with the most faults, accounting for 29% of the total number of transformer faults. [0004] For many years, testing bushings has often meant taking the transformer out of service, closely inspecting the bushing for cracks or defects, monitoring internal oil levels, measuring the capacitance or power factor...

AI Technical Summary

Problems solved by technology

[0005] On-line monitoring of casing dielectric loss, which is occasionally applied, has not been popularized because of the single monitoring principle, easy to be affected by environmental factors, and high false alarm rate due to inaccurate monitoring.

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