Transformer bushing ultrahigh frequency partial discharge on-line monitoring system and partial discharge type diagnosis method

Abstract

The invention discloses a transformer bushing ultrahigh frequency partial discharge on-line monitoring system, which relates to the technical field of electrical equipment partial discharge and is composed of a magnetic type sensor array unit, a comprehensive monitoring unit and a comprehensive monitoring background. The magnetic type sensor array unit is composed of a plurality of ultrahigh frequency sensors which are evenly arranged on the outer edge of the sleeve heating base. The comprehensive monitoring unit comprises an acquisition and main control module, a filtering module, a power supply module and a communication module; according to the bushing ultrahigh-frequency partial discharge online monitoring system, the magnetic type ultrahigh-frequency sensor which is simple to use and convenient to install is magnetically attracted to an ascending flanged base of the bushing of an ultrahigh-voltage transformer, so that safe and reliable operation of an end screen is ensured; a noise channel is independently arranged in the comprehensive detection unit, so that field noise can be directly distinguished from a partial discharge signal of the bushing, and the comprehensive detection unit has relatively high sensitivity and anti-interference capability.

Description

technical field [0001] The invention relates to the technical field of partial discharge of electrical equipment, in particular to an on-line monitoring system for UHF partial discharge of a transformer bushing and a method for diagnosing the type of partial discharge. Background technique [0002] Transformer bushings are key insulation support equipment in power systems. Transformer bushings have to be affected by various factors such as heat, electricity, chemistry, and machinery for a long time during operation, resulting in partial discharge, resulting in insulation degradation and performance degradation. In severe cases, transformers and adjacent equipment will be damaged. In turn, it will cause power outages or even explosions, leading to local or even large-scale power outages, which will have a huge negative impact on the national economy and social stability. [0003] At present, many transformer bushings are not equipped with partial discharge on-line monitoring...

AI Technical Summary

Problems solved by technology

Transformer bushings have to be affected by various factors such as heat, electricity, chemistry, and machinery for a long time during operation, resulting in partial discharge, resulting in insulation degradation and performance degradation. In severe cases, transformers and adjacent equipment will be damaged. In turn, it will cause power outages or even explosions, leading to local or even large-scale power outages, which will have a huge negative impact on the national economy and social stability.

[0003] At present, many transformer bushings are not equipped with partial discharge on-line monitoring systems, and it is impossible to obtain timely and accurate partial discharge information of transformer bushings, so that fault diagnosis cannot be performed based on partial discharge information; the existing online monitoring of bushings is aimed at Generally, the pulse current sensor or UHF sensor is installed at the end screen of the casing. This monitoring method itself is susceptible to on-site electromagnetic interference, and needs to modify the structure of the end screen of the casing, which destroys the original internal electric field of the casing. , making the reliable end screen extremely vulnerable to damage during operation, adding new safety hazards

In other words, some partial discharge on-line monitoring systems that have been applied in the field are not accurate in the diagnosis of discharge types, and cannot achieve a discharge type identification function.

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