By hvhipot 
The measurement principle of the partial discharge detector and the influence of partial discharge on power equipment. In order to understand the test efficiency of the partial discharge detector, we first need to know what is the partial discharge detector test.
Partial discharge detector test digital partial discharge detection system can detect machine failure, vibration, leakage and high-frequency signals generated by electrical partial discharge. The digital partial discharge testing machine uses the universal heterodyne method to convert these signals into audio signals, so that the operator can hear these sounds through headphones and see the intensity indication in the pointer. The principle of heterodyne method is like a radio, it can accurately convert the signal into sound, making it easy for people to recognize and understand. The advantages of digital partial discharge detection system using ultrasonic technology are simple, easy to understand and convenient. Ultrasound is a high-frequency and short-wave signal. This sound wave cannot be heard directly by people. We can fully detect these sounds through an ultrasonic full-function detector. Using advanced visual ultrasonic principles and sophisticated sensing skills, it can vividly show the picture of the discharge, and notify the maintenance personnel to check through three ways of digital, sound and pictures to ensure the safe operation of the GIS.
The traditional insulation test method is difficult to find the shortcomings of partial discharge, and the 1min AC withstand voltage test will damage the insulation and affect the future operation of the equipment. With the improvement of voltage levels, this problem becomes more serious. In recent years, 50% of large-scale transformer incidents above 110kV are caused by turns or inter-section short circuits under normal operation, forming an emergency end, and the cause is also caused by partial discharge. Therefore, testing the partial discharge characteristics of the transformer is a good way to prevent transformer failures.
The partial analysis system of the partial discharge detector is composed of three modules: a signal processing module, a block module, and an acquisition and processing module. According to the system connection diagram, the impedance is detected and the partial discharge signal is sent to the signal processing module. The signal processing module collects the partial discharge signal and sends the partial discharge signal to the circuit breaker module after completing functions such as amplification and shaping. The circuit breaker module connects the computer acquisition and processing module with the The signal processing module is isolated to avoid mixing between them. Finally, the acquisition and processing module completes the detailed functions of the partial discharge signal acquisition, processing, analysis and expression.
1. The operation and protection of the partial discharge detector of the partial discharge detector should be carried out by the responsible experts.
2. The experimental site voltage of some partial discharge detectors reaches tens of thousands of volts, and the experimenters must strictly abide by all safety precautions. The experimental area must be a prominent and clear warning board, and everyone on the scene should be aware of the high-pressure area. The measurer who is directly engaged in the measurement must understand all the live factors and high-voltage factors in the measurement circuit, and the person who is not directly engaged in the measurement must be isolated from the experimental area. During the experiment and after the power is turned on, no one is allowed to enter the high-voltage area.
3. Before the partial discharge detector experiment, the operator must master the test circuit, test method, test process and test purpose.
4. The experimental site of the partial discharge detector should be tidy and clean, and other irrelevant items should not be stored. Please avoid scattered small metal pieces (bare copper wire segments, screws, nuts, other small metal pieces, etc.) on the ground in the high-voltage area. The test piece, step-up transformer, coupling capacitor, etc. should be kept at a proper distance from the surroundings.