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Method for separating periodic component and steep pulse component in insulated leakage current

A technology of leakage current and periodic component, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as difficulty and achieve the effect of effective separation

Inactive Publication Date: 2014-06-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amplitude of pulse discharge in practical applications varies from large to small. When a pulse discharge with a small amplitude occurs in the non-peak area of ​​the current, it is necessary to judge whether the discharge occurs in the cycle according to the maximum amplitude of the signal. difficulty, especially to achieve an automatic threshold is even more difficult

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  • Method for separating periodic component and steep pulse component in insulated leakage current
  • Method for separating periodic component and steep pulse component in insulated leakage current
  • Method for separating periodic component and steep pulse component in insulated leakage current

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Embodiment 1

[0033] figure 1 It is a flow chart of the separation method of the periodic component and the steep pulse component in the insulation leakage current. figure 1 Among them, the separation method of the periodic component and the steep pulse component in the insulation leakage current provided by the present invention includes:

[0034] Step 1: Obtain the insulation leakage current signal s(n), where n represents the serial number of the signal.

[0035] Obtaining the insulation leakage current signal is a common technical means used by those skilled in the art, and methods such as non-inductive resistors or Rogowski coils can be used.

[0036] Step 2: Filter the insulation leakage current signal s(n) to obtain the filtered current signal s 1 (n).

[0037] The invention uses an improved median filter algorithm to filter the insulation leakage current signal s(n), thereby obtaining the filtered current signal s 1 (n). Median filtering is a nonlinear filtering method, which s...

Embodiment 2

[0057] The effect of the method provided by the present invention in specific implementation will be illustrated through experiments below.

[0058] Schematic diagram of insulator leakage current test figure 2 shown. Among them, T1 is a voltage regulator, T2 is an isolation transformer, L is a filter, T3 is a transformer, G is a ball gap, K is an artificial climate chamber, S is a test insulator, F is a capacitor voltage divider, R1 is a transformer anti-corrosion Vibration resistor, R2 is ball gap protection resistor, R3 is non-inductive resistor, TVS is transient voltage suppressor, Y is oscilloscope.

[0059] The test product is the XWP2-70 high-voltage line pollution-resistant disc-shaped suspension insulator produced by Inner Mongolia Jingcheng High Voltage Electric Porcelain Co., Ltd. The single-chip test product is subjected to a constant voltage of 10kV, the sampling frequency is 25kHz, and the number of sampling points is 2500.

[0060] Both the separation method b...

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Abstract

The invention discloses a method for separating a periodic component and a steep pulse component in insulated leakage current in the technical field of the control of power transmission. The method for separating the periodic component and the steep pulse component in the insulated leakage current comprises the following steps of: obtaining a signal s (n) of insulated leakage current; filtering the signal s (n) of the insulated leakage current so as to obtain a signal s1 (n) of filtering current; calculating by utilizing a formula of s2 (n) = s (n) - s1 (n) so as to obtain a signal s2 (n) of difference current; processing the signal s2 (n) of the difference current so as to obtain a steep pulse component s3 (n) of the insulated leakage current; and calculating by utilizing a formula of s4 (n) = s (n) - s3 (n) so as to obtain a periodic component s4 (n) of the insulated leakage current. According to the method for separating the periodic component and the steep pulse component in the insulated leakage current, the effective separation of the periodic component and the steep pulse component in the insulated leakage current is realized.

Description

technical field [0001] The invention belongs to the technical field of power transmission control, in particular to a method for separating periodic components and steep pulse components in insulation leakage current. Background technique [0002] The AC leakage current of insulation contains periodic components, and often also contains very steep pulse components. Both of them contain information that reflects the insulation status. There are many insulation analyzes based on leakage current that need to analyze periodic components and pulse components. If not The accurate separation of the two will definitely affect the effect of the analysis based on the leakage current. [0003] The digital filtering method and the digital non-filtering method can realize the separation of the periodic component and the pulse component in the insulation leakage current. [0004] The digital filtering method obtains the periodic component by filtering out the pulse component. The princip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R27/26
Inventor 律方成徐志钮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)