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Oil paper insulation early stage discharge defect diagnosis method

A technology of oil-paper insulation and defect diagnosis, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of reliable support

Inactive Publication Date: 2011-10-05
STATE GRID CORP OF CHINA +2
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Problems solved by technology

It can be seen that there is no use of the characteristic parameters of the partial discharge signal to identify the early partial discharge defects inside the transformer, so it is difficult to take corresponding maintenance measures for the partial discharge defects that are already in the development stage

Method used

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  • Oil paper insulation early stage discharge defect diagnosis method
  • Oil paper insulation early stage discharge defect diagnosis method
  • Oil paper insulation early stage discharge defect diagnosis method

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Embodiment Construction

[0019] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0020] By monitoring the whole process of the occurrence, development and final breakdown of partial discharge, the development and change law of the characteristic parameters of partial discharge, especially the frequency of discharge pulses, phase distribution characteristics and the development law of the characteristic gas content in oil are obtained. By digging deeply into the hidden information on the degree of insulation degradation, the division criteria for distinguishing early defects from defects in the rapid development stage can be obtained.

[0021] In the present invention, the applicant has established a power transformer oil-paper insulation partial discharge test platform and a ball-plate oil wedge di...

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Abstract

The invention discloses an oil paper insulation early stage discharge defect diagnosis method in the field of transformer partial discharge partial discharge monitoring technology in an electric power system. The method comprises collecting a partial discharge pulse signal of a transformer in a signal power frequency period and extracting the number of the pulse, carrying out a statistics towards the phase distribution of the transformer discharge impulse and acquiring the phase distribution range of the pulse, detecting the content of acetylene in the transformer oil, using oil paper insulation early stage discharge defect to set a standard and determining whether the oil paper insulation discharge in the transformer is at an early stage or not. According to the invention, a goal of recognizing early stage partial discharge defects in the transformer is achieved by observing characteristic parameters such as the frequency and phase of the discharge impulse, the gas content in the oil and the like and supports are provided for the state assessment and maintenance of the transformer.

Description

technical field [0001] The invention belongs to the technical field of partial discharge monitoring of transformers in power systems, and in particular relates to a method for diagnosing early discharge defects of oil-paper insulation. Background technique [0002] Oil-paper insulation is an internal insulation component of oil-immersed transformers. Oil-immersed transformers are currently the mainstream transformers. Transformer is the key equipment in the power system. As an important part of the transmission network, it is responsible for the important task of power transmission in the system. The reliability of its operation is directly related to the safety and stability of the power system. From the statistical results of transformer damage accident parts, the transformer winding is the main damage part of transformer damage accidents. Partial discharge is one of the main causes of transformer insulation failure. Due to short circuit at the transformer outlet or near...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R23/02
Inventor 程养春陈金祥李成榕林韩郑重王伟薛阳杨圆岳华山盛康
Owner STATE GRID CORP OF CHINA
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