High senitive system for detecting local discharging of high voltage electric power equipment with large capacity
A high-voltage power equipment, partial discharge detection technology, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength and other directions, can solve the problems of difficult DC partial discharge testing, submerged noise signals, and small test signal amplitudes, and achieves good results. The effect of dynamic characteristics, high signal-to-noise ratio and good linearity
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[0027] Figure 1 shows that a specific implementation of the present invention is: a high-sensitivity DC partial discharge detection system for large-capacity high-voltage power equipment, which is composed of: a DC high-voltage source 4 provides a high-voltage DC voltage to a balanced detection impedance circuit 1. The test sample C is extracted from the balanced detection impedance circuit 1 X The partial discharge signal is sent to the differential amplifying and filtering circuit 2 for differential amplifying and filtering processing, and then sent to the data acquisition and analysis system 3 for processing to obtain the detection and analysis result of the partial discharge signal.
[0028] The composition of the balanced detection impedance circuit 1 is: two identical detection impedances Zm and Zm’ form a balanced detection impedance Z, which are respectively the same as the tested sample C X , Standard coupling capacitor C K Connected to form two branches, the two branches...
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