Transformer substation partial discharge locating method based on spatial spectrum unambiguous estimation

A technology of partial discharge and positioning method, which is applied in the direction of testing dielectric strength, etc., can solve the problems of low direction finding accuracy, excessive array size, and direction finding blur, and achieve the effect of reducing array size, improving detection efficiency, and reducing costs

Inactive Publication Date: 2018-04-20
STATE GRID TIANJIN ELECTRIC POWER +3
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, propose a substation partial discharge localization method based on spatial spectrum unambiguous estimation, and solve the problems of fuzzy direction finding, low direction finding accuracy and too large array size

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  • Transformer substation partial discharge locating method based on spatial spectrum unambiguous estimation
  • Transformer substation partial discharge locating method based on spatial spectrum unambiguous estimation
  • Transformer substation partial discharge locating method based on spatial spectrum unambiguous estimation

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Embodiment Construction

[0046] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0047] A substation partial discharge localization method based on spatial spectrum unambiguous estimation, such as figure 1 shown, including the following steps:

[0048] Step 1. Select a uniform circular array as the UHF antenna array, and the number of array elements is greater than 4 (excluding 6).

[0049] As an example, a uniform circular array with a radius of 0.3m is selected, the number of array elements is selected as 5, and the establishment is as follows figure 2 The coordinate system shown.

[0050] Step 2, using the least square algorithm to focus on the collected partial discharge signals.

[0051] In this step, a broadband focusing algorithm is used for focusing, and the broadband focusing algorithm includes the following steps:

[0052] a) Use discrete Fourier transform to disperse the partial discharge signal collected by...

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Abstract

The invention relates to a transformer substation partial discharge locating method based on spatial spectrum unambiguous estimation. The transformer substation partial discharge locating method is technically characterized by comprising the following steps that a uniform circular array is selected as an ultrahigh frequency antenna array; the acquired partial discharge signals are focused by usingthe least square algorithm; the azimuth angle and the pitch angle of a partial discharge source are calculated by using a multi-signal classification algorithm based on the fourth-order cumulant; andthe position of the antenna array is changed and the electric power equipment having partial discharge is determined. Transformer substation partial discharge is located by using the method based onspatial spectrum unambiguous estimation so that partial discharge detecting and locating of all the electric power equipment in the open transformer substation can be realized; besides, the detectingsystem has small size and has no problem of direction finding ambiguity so that the problems that the present partial discharge detecting system based on the ultrahigh frequency antenna array has large size and inspection is not implemented easily can be effectively solved, the cost of the large installing equipment state online detecting device can be greatly reduced and the detecting efficiencycan be enhanced.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection of electric power equipment, in particular to a substation partial discharge location method based on spatial spectrum unambiguous estimation. Background technique [0002] There are a large number of open substations, the operating environment is harsh, and the insulation of high-voltage equipment is aging seriously. Partial discharge problems should attract more attention. At present, in the partial discharge detection carried out at home and abroad, the sensors are usually fixedly installed on core equipment such as gas-insulated electrical appliances and transformers, and the partial discharge detection and positioning are mainly carried out for specific equipment. Partial discharge may occur in any high-voltage power equipment such as circuit breakers, disconnectors, bushings, and voltage / current transformers in substations, causing insulation failures. However, partial di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 于啸韩斌吴世哲杨勇志郭永占赵聪李松原刘青邓军波刘伟
Owner STATE GRID TIANJIN ELECTRIC POWER
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