When the field strength of the applied voltage in the electrical equipment is enough to cause the discharge in the insulating part area, but the discharge phenomenon that no fixed discharge channel is formed in the discharge area is called partial discharge.

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The partial discharge tester has a digital partial discharge detector using the principle of the pulse current method:
The pulse current method means that when a partial discharge occurs, the two ends of the sample Cx make an instantaneous voltage change Δu. At this moment, if the electric Ck is coupled to a detection impedance Zd, a pulse current I will be generated in the circuit, and the pulse current will be generated through the detection impedance. The pulse voltage information is detected, amplified and displayed, and some fundamental parameters of the partial discharge (mainly the discharge quantity q) can be determined.
It should be pointed out here that the actual partial discharge inside the test product cannot be measured. Because the transmission path and direction of the partial discharge pulse inside the test product are extremely complicated, we only need to use the comparison method to detect the visual appearance of the test product. In the discharge charge, that is, inject a certain amount of electricity at both ends of the test sample before the test, adjust the magnification to establish a scale, and then compare the part of the discharge pulse inside the test sample received under the actual voltage with the scale, so as to obtain Apparent discharge charge of the test object.
The digital partial discharge detector ensures the reliability of the detected data through digital signal processing, adaptive filtering and other interference signal processing methods.