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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

Inactive Publication Date: 2007-07-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Therefore, the test signal has a small amplitude and is easily overwhelmed by noise signals, which brings great difficulties to the DC partial discharge test.

Method used

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  • High senitive system for detecting local discharging of high voltage electric power equipment with large capacity

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specific Embodiment approach

[0027] Figure 1 shows that a specific embodiment 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 sample C to be tested is extracted by the balanced detection impedance circuit 1 X The partial discharge signal is sent to the differential amplification filter circuit 2 for differential amplification and filtering, and then sent to the data acquisition and analysis system 3 for processing to obtain the detection and analysis results of the partial discharge signal.

[0028] The composition of the balanced detection impedance circuit 1 is as follows: two identical detection impedances Zm and Zm' form a balanced detection impedance Z, which are respectively connected to the tested sample C X , standard coupling capacitor C K connected to form two branches, and the ...

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Abstract

A detection system of high sensitivity DC local discharge on large-capacity high voltage power device is prepared for providing high voltage DC voltage to balance detection impedance circuit by DC high voltage source, picking up local discharge signal of detected sample by balance detection impedance circuit, sending local discharge signal to differential amplification filtering circuit to carry out differential amplification filtering treatment than sending treated signal to data collection and analysis unit for obtaining detection and analysis result of local discharge signal.

Description

technical field [0001] The invention relates to a high-sensitivity DC partial discharge detection system for large-capacity high-voltage power equipment. Background technique [0002] With the development of the electric power industry, there are more and more electrical equipment working under DC voltage, such as DC transmission insulated cables, filter capacitors in HVDC converter stations, performance test devices such as electromagnetic accelerators, nuclear fusion, and pulsed laser power supplies. High-density energy storage capacitors, etc. [0003] During the DC transmission process of insulated cables, the polluted environment makes the insulation prone to dendrite aging under the action of high voltage, which seriously affects the current transmission and safety. With the gradual establishment of ±500kV and ±800kV UHV DC transmission lines in China, a large number of DC high-voltage capacitors are used as filter capacitors in high-voltage and large-capacity voltage...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/14G01R31/00
Inventor 张血琴吴广宁张星海冉汉政曲衍宁王鹏李晓华边姗姗
Owner SOUTHWEST JIAOTONG UNIV
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