How does a partial discharge tester resist interference

The anti-interference ability of a partial discharge tester refers to its ability to resist the influence of external electromagnetic fields, interference sources, and other electrical signals from the equipment itself in practical use. The following are several commonly used anti-interference methods for partial discharge testers:  

1. Electromagnetic shielding design: Partial discharge testers usually adopt a reasonable electromagnetic shielding design, which reduces the impact of external electromagnetic interference on internal circuits through the design of the device casing and material selection.

2. Filtering technology: The partial discharge tester will perform filtering processing on the signal input end, filtering out high-frequency noise and stray signals, and retaining the partial discharge signal.

3. Anti interference algorithm: The data processing unit (such as DSP or FPGA) inside the partial discharge tester will use anti interference algorithms to denoise and filter the collected signals to improve testing accuracy and anti-interference ability.

4. Site environment control: In order to reduce external interference, the use site of partial discharge testers should try to avoid electromagnetic radiation sources, strong current equipment, and other equipment that may interfere with the testing. At the same time, measures such as ground wire connection and shielding should be taken to further reduce the possibility of interference.

5. Signal calibration and reference level: The partial discharge tester will perform signal calibration and set the reference level before use to ensure the accuracy and consistency of the test results. During calibration, Confounding of the equipment itself can be eliminated and reference values can be established.

。The above are some commonly used anti-interference methods, but it should be noted that in the actual testing process, it is very difficult to completely eliminate interference due to various uncertain factors. Therefore, in partial discharge testing, operators need to have rich experience and professional knowledge, while combining anti-interference technology to obtain reliable test results.
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