A partial discharge tester high speed wave recording method

Abstract

The invention provides a partial discharge tester high speed wave recording method. A hardware logic controlled high speed analog-digital converter is used for sampling high frequency partial discharge signals in real time, and a high speed memory in hardware is used as a buffer area to store sampling data obtained through high speed sampling; when a wave recording start signal is received, a waverecording data reading position is set to be before a current write data position, wherein the specific position is set according to practical requirements and the wave recording start signal is generated automatically when control logic judges that the amplitude of partial discharge signals exceeds the set threshold and generated through CPU control; when the write data position is moved to theprevious storage unit of the data reading position, write operation is stopped, a buffer area write indicator points to the next double end buffer area and the CPU is informed to start read wave recording data. The method can store and display discharge signal oscillograms and provide direct and visual criteria, so that partial discharge signals and interference signals can be distinguished more accurately.

Description

technical field [0001] The invention relates to the technical field of partial discharge detection, in particular to a high-speed wave recording method for a partial discharge tester. Background technique [0002] When high-voltage electrical equipment works in a high-voltage environment for a long time, the insulation material of the equipment will gradually deteriorate, generate partial discharge, and even be broken down under the action of a strong electric field, seriously affecting the normal operation of the equipment. Long-term partial discharge will cause insulation failure of electrical equipment, which will affect the use of electricity in the slightest, and cause equipment damage or even explosion in severe cases, resulting in heavy losses of personnel and property. Therefore, we need a partial discharge tester to regularly detect electrical equipment. [0003] However, currently known partial discharge testers can only display the value of the detected signal, a...

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Problems solved by technology

[0003] However, currently known partial discharge testers can only display the value of the detected signal, and cannot distinguish whether the detected partial discharge is real or external interference, which is likely to cause misjudgment, waste manpower and financial resources

On the other hand, the frequency of partial discharge signals is very high (several megahertz to tens of megahertz), and the speed of sampling and processing is higher. Generally, CPUs cannot complete such fast and real-time operations, and hardware logic such as FPGA is usually used to Therefore, the original waveform of the PD signal is generally not available, resulting in a lack of intuitive criteria for PD judgment

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