On-line detection method and device for power capacitor

A technology of a power capacitor and a detection method, which is applied in the direction of testing dielectric strength, etc., can solve the problems of large energy loss of partial discharge signal, signal loss energy, signal distortion, etc.

Inactive Publication Date: 2012-10-17
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Although these methods can suppress the interference signal to a certain extent, the energy loss of the original partial discharge signal is relatively large, and when new interference occurs or the center frequency of the interference changes, t...

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  • On-line detection method and device for power capacitor
  • On-line detection method and device for power capacitor
  • On-line detection method and device for power capacitor

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Embodiment Construction

[0061] A power capacitor online detection device such as figure 1 As shown, it is mainly composed of a current transformer, a signal conditioning unit and a data acquisition and processing unit. The data acquisition and processing unit includes an analog-to-digital conversion module, an EMD decomposition and screening IMF component module, a mathematical morphology alternating hybrid filter, a threshold quantization processing module and Refactor the module. The current transformer is socketed on the grounding wire of the low-voltage bushing of the power capacitor, the output end of the current transformer is connected to the input end of the analog-to-digital conversion module of the data acquisition and processing unit through the signal conditioning unit, and the output end of the analog-to-digital conversion module is connected to the EMD decomposition The input end of the screening IMF component module is connected, the output end of the EMD decomposition and screening IM...

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Abstract

The invention discloses an on-line detection method and device for a power capacitor. A current sensor is used for collecting a noise-contained local electric discharge signal of a capacitor; after the signal is processed, a complex signal is decomposed into limited intrinsic mode function components by empirical mode decomposition; the intrinsic mode function components are subjected to mathematical morphology alternate mixing filter by a flat structure element; a threshold value and a hard thresholding rule are determined by a 3sigma gross error standard to carry out threshold value discrimination to a new intrinsic mode function component; the intrinsic mode function component processed by the threshold value is reconfigured to obtain a de-noised power capacitor local discharge signal; and the signal is sent into the computer to obtain the on-line working condition of the capacitor. The on-line detection method has a clear physical meaning on processing non-linear and non-stable signals and has a good localized characteristic in a frequency domain and a time domain, the original morphological characteristics of the signal can be kept to the maximum degree, local signal dynamic behaviors and characteristics can be analyzed, and the on-line detection target of the power capacitor can be better realized.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to an online detection method and device for a power capacitor. Background technique [0002] With the development of social economy, the social electricity consumption is increasing rapidly, the scale and transmission capacity of the power system are also increasing rapidly, and the requirements for the reliable operation of the power system are getting higher and higher. The role of power capacitors in the power system is mainly to compensate the reactive power of the inductive load of the power system, improve the power factor, improve the voltage quality, and reduce line losses. The reliability of its operation is directly related to the safe and stable operation of the power system. However, due to the influence of overvoltage, overcurrent, temperature, harmonics, etc. during operation, the strength of the insulating medium will gradually decrease, which is obviously ma...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 黄知超延红艳范兴明李震陈佩翔杨升振申双江张科伟
Owner GUILIN UNIV OF ELECTRONIC TECH
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