On-line calibrator for partial discharge of high-voltage switch cabinet by three-phase synchronous pulse current method

Abstract

The invention relates to the technical field of high-voltage switch cabinet monitoring, and discloses an on-line calibrator for partial discharge of high-voltage switch cabinet by a three-phase synchronous pulse current method. The on-line calibrator comprises a high-voltage switch cabinet, wherein the high-voltage switch cabinet can be divided into a first cabinet and a second cabinet, and the first cabinet is internally provided with a partial on-line discharge calibrator and an a calibration capacitor connected with a port of the partial on-line discharge calibrator. According to the on-line calibrator provided by the invention for the partial discharge of the high-voltage switch cabinet by the three-phase synchronous pulse current method, the on-line calibration for the partial discharge can be easily realized in the actual use process, a high-voltage calibration capacitor does not need to be externally arranged because the original coupling capacitor of the high-voltage switch cabinet is directly used as the calibration capacitor, and the cost of a high-voltage power supply module is saved at the same time. In addition, each on-line monitoring host can accurately and consistently carry out real-time on-line monitoring on electric equipment, so that the accuracy and consistency of each monitor are well guaranteed.

Description

technical field [0001] The invention relates to the technical field of high-voltage switchgear monitoring, in particular to an on-line partial discharge calibrator for high-voltage switchgear with three-phase synchronous pulse current method. Background technique [0002] Laboratory pulse current method partial discharge calibrator, this calibrator is only suitable for off-line calibration of laboratory pulse current method partial discharge tester, only suitable for calibration work of the tested equipment in the laboratory; the specific technical scheme is as follows: Calibration signal The voltage source is a high-voltage power supply with continuously adjustable output, and then the output of the high-voltage module is grounded instantly through a high-speed mosfet. At this time, a voltage pulse U with a falling edge of about 20ns will be generated. This pulse passes through a calibration capacitor of about 100pF After C, a signal equivalent to partial discharge will be ...

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Problems solved by technology

[0003] However, the current technology has the following disadvantages: first, it can only be calibrated offline, that is, the partial discharge tester can be calibrated when the experimental equipment is not connected to the high voltage; the offline calibration is only aimed at the accuracy of the partial discharge measurement of the electrical equipment itself , when the electrical equipment is installed on the power system and connected to high voltage, the parasitic capacitance and other parameters of the entire system will have a great impact on the transmission of the discharge signal. If the influence of these parasitic parameters is not calibrated, the partial discharge The value will be very different from the value in the laboratory; secondly, phase calibration cannot be performed, because the collection of partial discharge and the analysis of the discharge characteristic map are closely related to the AC voltage phase of the power grid. If the phase of the partial discharge tester is not accurate, directly It affects the analysis and positioning of the partial discharge characteristic map; thirdly, a high-voltage power supply module is required. At present, the domestic modules are immature, and the cost of foreign modules is relatively high, which makes the cost of the offline calibrator very high.

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