Evaluation method for electrical life loss and arc extinguishing ability of circuit breakers in smart substations

Abstract

The invention discloses a method of evaluating intelligent substation circuit breaker electrical life loss and an arc extinguishing ability. The method comprises steps: a network message recorder is used for capturing a circuit breaker opening command message with a time scale and a corresponding circuit breaker opening position message in a GOOSE net, the time for issuing the opening command and the time for issuing the opening position message are acquired, the circuit breaker arcing start time is calculated, an SV message corresponding to a circuit breaker opening event is captured, the circuit breaker arc current effective value at the arcing start time is calculated, the arc extinguishing time is calculated, the opening life loss is calculated and the like; the circuit breaker arcing time is calculated, the circuit breaker arc extinguishing remaining stroke time is calculated, the circuit breaker arc extinguishing remaining stroke is calculated. By using the method provided by the invention, no special sensor needs to be added, no other special hardware needs to be added, and thus, the intelligent substation circuit breaker conductive contact electrical life loss and the arc extinguishing ability can be monitored and evaluated, and the method is effective, economic, simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of evaluating characteristics of circuit breakers in intelligent substations, in particular to an evaluation method for electrical life loss and arc extinguishing capabilities of circuit breakers in intelligent substations. Background technique [0002] The condition-based maintenance of high-voltage electrical equipment in the power grid can deal with equipment defects in a timely manner, improve maintenance efficiency, and extend the service life of equipment, which is of great significance to the safe and economical operation of the power grid. Accurate condition monitoring and condition evaluation are the technical basis for condition-based maintenance. [0003] The condition monitoring and condition evaluation of the electrical life of the main contact of the circuit breaker is an important basis for the condition-based maintenance of the switchgear in the substation. In the existing state monitoring m...

AI Technical Summary

Problems solved by technology

Since this type of method needs to be equipped with special sensors and data processing devices, the application of these technologies is limited by technical and economic factors and the reliability of online monitoring equipment itself, resulting in the failure to generally realize the monitoring of high-voltage switchgear in existing smart substations ( Including circuit breaker, isolating switch, grounding switch, the same below) condition monitoring and evaluation of mechanical characteristics, so that the implementation effect of condition-based maintenance is affected

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