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Method and system for precise orientation on local discharging

A partial discharge and precise orientation technology, which is applied in the direction of testing dielectric strength, etc., can solve the problem of partial discharge signal randomness, etc., achieve high orientation success rate, good performance, and improve the effect of orientation accuracy

Inactive Publication Date: 2019-05-28
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0005] One of the purposes of the present invention is to provide a method for precisely orienting partial discharges, which aims to solve the problem of partial discharge signal randomness, and builds the likelihood of partial discharge signals on the basis of deriving the probability density function of partial discharge signals function, and then bring the measured partial discharge signal samples into the partial discharge signal likelihood function, by calculating the maximum value of the partial discharge signal likelihood function, the direction angle at which the maximum probability of partial discharge is located is obtained by reverse deduction

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  • Method and system for precise orientation on local discharging
  • Method and system for precise orientation on local discharging
  • Method and system for precise orientation on local discharging

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[0084] The method for accurately orienting partial discharge and its system according to the present invention will be further explained and illustrated in conjunction with the accompanying drawings and specific embodiments. However, such explanations and illustrations do not constitute improper limitations on the technical solution of the present invention.

[0085] figure 1 It is a schematic flowchart of the method for precisely orienting partial discharges described in the present invention in an implementation manner.

[0086] like figure 1 As shown, in this embodiment, the method for precisely orienting the partial discharge includes the following steps:

[0087] Step 100: Construct the partial discharge signal likelihood function:

[0088]

[0089] Among them, L(θ,σ 2 ) means that when the measured partial discharge signal is y i In the case of , the partial discharge incident angle is θ, and the noise size is σ 2 The size of the probability; n represents the num...

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Abstract

The invention discloses a method for precise orientation on local discharging. The method comprises the steps that 1, a local discharging signal likelihood function shown in the description is established, wherein L(theta, sigma 2) expresses the probability that the local discharging incidence angle is theta and the noise magnitude is sigma 2 under the condition that it is measured that local discharging signals are yi; n expresses the number of the local discharging signals in a local discharging signal sample; sigma 2 expresses a noise variance, s(t) expresses a local discharging signal source vector, and a (theta) expresses a local discharging signal steering vector; 2, the local discharging signal sample obtained through measurement is substituted into the local discharging signal likelihood function, so that a maximum value of the local discharging signal likelihood function is solved; a local discharging incidence angle theta0 corresponding to the maximum value represents the direction of the local discharging signals. In addition, the invention further discloses a system for precise orientation on local discharging. The system comprises a processing module and a local discharging signal receiving antenna.

Description

technical field [0001] The invention relates to a positioning method and system, in particular to a positioning method and system for a substation. Background technique [0002] Partial Discharge (PD for short) is a manifestation of the deterioration of insulation performance of power equipment, and it is also the cause of further deterioration of insulation performance, so the positioning of partial discharge is of great significance. The detection and location of partial discharge can be realized by ultrasonic method, electrical parameter measurement method and ultra-high frequency electromagnetic wave and other methods. However, because the partial discharge positioning method based on ultra-high frequency electromagnetic waves has the advantages of strong anti-interference and high detection sensitivity, it is very suitable for field applications. [0003] The discharge volume of partial discharge changes randomly, and the partial discharge signal is easily disturbed by...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 罗林根周南盛戈皞宋辉钱勇刘亚东江秀臣
Owner SHANGHAI JIAO TONG UNIV
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