Method and system for identifying transition resistance during short-circuit fault of power system

Abstract

The invention provides a method and a system for identifying a transition resistor during a short-circuit fault of a power system, and the method comprises the steps: injecting a DC voltage into the power system through a high-voltage injection resistor, and detecting and collecting an output current Idc, three-phase voltages Ua, Ub and Uc, and three-phase load currents Ia, Ib and Ic; when the power system operates normally, calculating equivalent insulation resistance R of the power system; according to the collected three-phase voltages Ua, Ub and Uc and the collected three-phase load currents Ia, Ib and Ic, judging the fault type; and calculating equivalent transition resistance R<transition> of the power system. The system is applied to the method. The identification device, the system and the identification method are used for identifying and calculating the transition resistance under the insulation state and the fault of the power system, the mechanism is clear, the physical significance is clear, and the effectiveness is high.

Description

Technical field [0001] The present invention relates to the field of power supply protection techniques, and more particularly to a method of identifying a transition resistance in a short circuit failure of a power system and a recognition system of the method. Background technique [0002] The short circuit failure of the power system has always threatened the safety and stable operation of the power system, because all types of equipment within the power system face the risk of burning. Therefore, the short-circuit fault of the power system is studied, and the characteristics of short-circuit faults are very important. In particular, it is further analyzed electromagnetic transient process and mechanism to develop electromagnetic transient processes and mechanisms, develop a new generation of power systems, and fault identification devices have particularly significant demand for electromagnetic transient process and mechanism. . [0003] Conventionally analyzes the short-circ...

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Problems solved by technology

[0003] Conventionally, there are many methods to analyze the type of short-circuit fault through the existing voltage and current, but there is still a lack of diagnostic method with clear mechanism for the identification of fault transition resistance in short-circuit

In particular, there is still a lack of effective solutions to analyze the transition resistance in the short-circuit fault process of the power system through simple devices and methods, and provide a substantive reference for the high-end diagnosis of the future power system

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