Device and method for online monitoring of partial discharge of shunt capacitor

Abstract

The invention relates to a device and a method for online monitoring of partial discharge of a shunt capacitor. The device comprises a capacitor, a broadband partial discharge sensor, a high-frequency coaxial cable, a signal hardware adjusting unit, an A / D (analog / digital) acquisition card and an industrial personal computer. The broadband partial discharge sensor is installed at the lower end connecting wire of the capacitor in a sleeving way and connected with the signal hardware adjusting unit through the high-frequency coaxial cable; the signal hardware adjusting unit is connected with a data acquisition device through the high-frequency coaxial cable; and the data acquisition device is connected with the industrial personal computer through a USB (universal serial bus) connecting wire. According to the device for online monitoring of partial discharge of the shunt capacitor, a partial discharge signal is sensed by a wide-band rogowski coil partial discharge sensor, the original connection way of equipment is not changed and high detection sensitivity is obtained. A band-pass filter with adjustable frequency band width and a broadband amplifier are adopted by the device, so that the detection sensitivity is improved greatly, the partial discharge signal can be effectively monitored, the partial discharge state of the capacitor in operation can be known in real time, and an equipment insulation fault is avoided.

Description

technical field [0001] The invention relates to the on-line monitoring technology of capacitors, relates to the on-line monitoring technology of partial discharge of capacitors, in particular to an on-line monitoring device and method of partial discharge of parallel capacitors. Background technique [0002] With the development of the national economy, the requirements for the reliable operation of the power system are getting higher and higher. The shunt capacitor is mainly used to compensate the reactive power of the inductive load of the power system to improve the power factor, improve the voltage quality, and reduce the line loss. In the power grid It plays an important role, and the reliability of its operation is directly related to the safety and stability of the power system. Statistical analysis of actual faults shows that among the main reasons affecting the normal operation of capacitors during insulation faults, partial discharge is the root cause of insulation...

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Problems solved by technology

[0004] Chinese patent application number 200920104603.0, titled "Capacitor Partial Discharge Detection Circuit", discloses a capacitor partial discharge detection circuit, but the circuit has a complex structure and is mainly used for off-line testing, and cannot be used for on-line monitoring of capacitor partial discharge

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