Power system computer aided design (PSCAD) based running fault simulation method of capacitor voltage transformer

Abstract

The invention discloses a power system computer aided design (PSCAD) based running fault simulation method of a capacitor voltage transformer (CVT). The PSCAD based running fault simulation method comprises the following steps of sorting device parameters of a 500-kV CVT in a site during actual running; building a system model of a CVT equivalent circuit, setting device parameters for the system model, and simultaneously configuring a secondary voltage monitor for the system model of the CVT equivalent circuit; building an adjustable AC power module, an adjustable capacitor component module and a module controller; performing breakdown fault analogue simulation of a capacitor component in the CVT; and acquiring a correlation between a breakdown fault of the capacitor component in the CVT and secondary voltage change before and after performing breakdown fault analogue simulation of the capacitor component in the CVT. The PSCAD based running fault simulation method has the advantages of flexibility, high efficiency, simplicity, feasibility, accuracy, fineness, no safety risk and no test cost, various running faults of the CVT can be simulated, a basis is provided for research on state monitoring and fault diagnosis of the CVT, and the PSCAD based running fault simulation method has favorable application prospect.

Description

technical field [0001] The invention relates to a method for simulating operation faults of capacitive voltage transformers based on PSCAD, and belongs to the technical field of high-voltage power equipment operation fault simulation. Background technique [0002] As an important measurement, protection and communication equipment in the power system, the stable operation of the capacitor voltage transformer (CVT) is very important to the safety of the power grid. However, the capacitor unit failure of CVT often occurs, which is manifested in the phenomenon of breakdown and explosion of the capacitor element due to moisture and aging during operation. Fault diagnosis methods are of great significance. [0003] At present, the method of using simulation software to simulate the fault of CVT has not been reported yet. Some researchers simulate the breakdown fault of its capacitive element through the physical CVT. The physical fault simulation test is based on the field capac...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of the existing CVT physical failure simulation test, the test cost is high, the implementation is difficult, there is a certain potential safety hazard, the wiring needs to be changed repeatedly, and the problem of lack of flexibility and accuracy

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