A correction method of internal synchronous reference for partial discharge monitoring based on sv sampling signal
A sampling signal and internal synchronization technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc.
Active Publication Date: 2017-01-18
XJ ELECTRIC +1
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[0004] The purpose of the present invention is to provide a partial discharge monitoring internal synchronization reference correction method based on SV sampling signals to solve the problems that occur in the current partial discharge monitoring device in the process of obtaining the power frequency voltage phase
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[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0019] The present invention is realized in the hardware architecture of the existing partial discharge monitoring equipment without changing the framework of the existing partial discharge monitoring equipment. The high-speed acquisition card for partial discharge monitoring uses its own timer to generate a 50Hz square wave signal that is the same as the power frequency cycle, That is, the "internal synchronization" signal mentioned in the background, and use the virtual power frequency phase signal to pre-calibrate the phase of each sensor input signal; the partial discharge data processing module receives the sensor digital signal that has undergone phase pre-calibration, and at the same time receives the merging unit The SV signal of the voltage transformer sent; the partial discharge data processing module corrects the virtual power freq...
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The invention, which belongs to the technical field of high-voltage equipment partial discharge monitoring, relates to an SV-sampling-signal-based partial discharge monitoring internal synchronization reference correction method. The method is realized based on the existing partial discharge monitoring equipment architecture. On the basis of not changing the existing partial discharge monitoring hardware structure, a high-speed acquisition card for partial discharge monitoring is used for generating a square signal identical with a power frequency period, wherein the square signal is used as an internal synchronization signal; the internal synchronization signal is used for carrying out phase pre calibration on all sensor input signals; a partial discharge data processing module carries out correction on the internal synchronization signal by using an SV voltage signal as a reference, thereby obtaining precise and reliable power frequency phase reference. According to the invention, a precise and reliable power frequency phase reference can be provided for a partial discharge on-line monitoring apparatus or partial discharge detection instrument on a conventional mutual inductor occasion or electronic transformer occasion. Therefore, the method has advantages of high flexibility and universality.
Description
technical field [0001] The invention relates to an internal synchronous benchmark correction method for partial discharge monitoring based on SV sampling signals, and belongs to the technical field of partial discharge monitoring for high-voltage equipment. Background technique [0002] Partial discharge monitoring of high-voltage equipment is one of the important technical fields of high-voltage equipment intelligence and high-voltage equipment condition monitoring. It can detect insulation problems in equipment operation in time, provide data and reference for power system optimization operation and condition maintenance, and reduce accidental power outages and maintenance. Huge losses caused by power outages. When partial discharge occurs inside high-voltage equipment, the partial discharge signal is highly correlated with the power frequency voltage of the equipment. This feature is not only an important method to distinguish partial discharge signals from interference n...
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IPC IPC(8): G01R35/00
Inventor 路光辉雍明超张仑山牧继清周钟王伟杰庒益诗郭旭
Owner XJ ELECTRIC