Anti-interference online monitoring method for partial discharge of high-voltage transformer bushing

A technology of high-voltage transformers and transformer bushings, which is applied in the direction of instruments, measuring electronics, and measuring devices, and can solve problems such as inaccurate measurement, inability to quantitatively measure partial discharge, and exposure to the outside world

Pending Publication Date: 2021-10-19
SIFANG-TBEA INTELLIGENT ELECTRICAL CO LTD
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Problems solved by technology

The first two methods are mainly to monitor the partial discharge of the transformer body, not the partial discharge of the transformer bushing; the third method is to use ultrasonic and ground wave sensors to couple the partial discharge signal of the bushing at the bushing riser seat. The disadvantages of this method are Quantitative measurement of partial discharge cannot be carried out, only qualitative measurement, and the transformer is greatly affected by its own vibration du

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  • Anti-interference online monitoring method for partial discharge of high-voltage transformer bushing
  • Anti-interference online monitoring method for partial discharge of high-voltage transformer bushing
  • Anti-interference online monitoring method for partial discharge of high-voltage transformer bushing

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] The invention uses HFCT to extract the partial discharge signal at the grounding line of the bushing end screen, and can separate the partial discharge signal of the transformer body and the partial discharge signal of the bushing, so as to filter out the discharge of the transformer body and retain the transformer bushing discharge purpose. In the high-voltage transformer bushing partial discharge monitoring system, the partial discharge signal of the transformer body can be regarded as an interference signal, and a certain method must be used to filter out the transformer body discharge signal, and because the partial discharge of the transformer body is greater than the partial discharge of the transformer bushing 1 to 2 orders of magnitude, and the two discharge mechanisms are similar, and the characteristics of the final discharge ...

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Abstract

The invention relates to an anti-interference online monitoring method for partial discharge of a high-voltage transformer bushing. A high-frequency current sensor is additionally arranged at a grounding wire of an iron core of a transformer besides a grounding high-frequency current sensor of an end screen of the transformer, two paths of signals can be synchronously acquired by the system, and through a time domain comparison algorithm of the two paths of signals, the partial discharge signal of the transformer can be effectively filtered, only the partial discharge signal of the bushing is reserved, and the purpose of monitoring the partial discharge of the high-voltage transformer bushing is achieved.

Description

technical field [0001] The invention belongs to the technical field of insulation monitoring of large-scale high-voltage transformer bushings, and in particular relates to an online partial discharge monitoring method of high-voltage transformer bushings. Background technique [0002] Transformers play an extremely important role in the process of power transmission. Transformers of different voltage levels can be combined to connect power grids of different voltages to form a complex and huge power network, so that power energy can be transmitted over long distances. The bushing of the transformer is the most important part of the inlet and outlet interface of the transformer busbar, and its performance will directly affect the normal operation of the transformer. [0003] At present, the testing of high-voltage transformer bushings is still mainly in the offline detection stage, that is, in the case of transformer power outage maintenance, the routine detection test of hig...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 庞佳曹成王富民闫睿智李高峰
Owner SIFANG-TBEA INTELLIGENT ELECTRICAL CO LTD
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