Transformer bushing insulation partial discharge monitoring system and method

Abstract

The invention provides a transformer bushing insulation partial discharge monitoring system and method. The method comprises the following steps of: sending out a discharge signal by a partial discharge source; sending out an ultrahigh-frequency electromagnetic wave signal by an ultrahigh-frequency sensor, and combining the ultrahigh-frequency electromagnetic wave signal with an ultrasonic signalsent by an ultrasonic sensor as auxiliary judgment signals; denoising a partial discharge signal, extracting an accurate partial discharge signal capable of reflecting a partial discharge problem in atransformer, and further extracting characteristic parameter information in the partial discharge signal; and finally, detecting a high-frequency current signal of a high-frequency current sensor, and judging whether a partial discharge signal exists in an internal insulation system of the transformer or not in combination with the ultrasonic signal sent by the ultrasonic sensor. According to theinvention, an electromagnetic vector sensor and an acousto-optic signal characteristic transformer partial discharge fault detection and positioning technology are utilized to establish a transformerpartial discharge detection method by combining inspection general measurement and accurate determination phase positioning.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular, the invention relates to a transformer bushing insulation partial discharge monitoring system and method. Background technique [0002] The transformer is the most expensive and most important primary piece of equipment in the power system. It is also the equipment with the most complex structure and high failure rate. The safe operation of the transformer is of great significance to ensure the reliability of power supply. The high failure rate of power transformers not only greatly affects the safe operation of the power system, but also causes huge economic losses to power companies and power users. [0003] How long does the transformer run or how many faults need to be overhauled? At present, there is no scientific conclusion and unified standard. In order to improve the reliability of the power system operation and reduce the economic losses caused by faults and accide...

AI Technical Summary

Problems solved by technology

The high failure rate of power transformers not only greatly affects the safe operation of the power system, but also causes huge economic losses to power companies and power users

[0003] How long does the transformer run or how many faults need to be overhauled? At present, there is no scientific conclusion and unified standard. In order to improve the reliability of the power system operation and reduce the economic losses caused by faults and accidents, the transformer should be regularly insulated. preventive test

However, conventional preventive tests require the transformer to be powered off, which affects the normal power supply. Some important data cannot be tested during a power outage, and a considerable part of the equipment replaced during regular maintenance is unnecessary, which greatly reduces the economy of power grid operation.

Therefore, the conventional method of periodic preventive testing is not compatible with the development trend of modern condition-based maintenance

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