Dual power capacitor compensation current sampling switching device based on auxiliary contact of circuit breaker

Abstract

The utility model provides a double power supply capacitor compensation current sampling switching device based on circuit breaker auxiliary contact belongs to low voltage distribution reactive compensation technical field. The utility model sets up current sampling mutual inductor in two way incoming line cabinet respectively, utilizes incoming line circuit breaker to correspondingly access two way current mutual inductor secondary sampling loop respectively with auxiliary contact, need not add intermediate relay and supporting control loop. The device relies on the characteristics of the auxiliary contact of the circuit breaker and the mechanical linkage of the opening and closing state of the body, automatically completes the interlocking switching of the two sampling loops, and makes the reactive power compensation controller accurately collect the load current of the current operating incoming line. The utility model has the advantages of simple structure, few fault points, synchronous and reliable switching response, completely getting rid of the restriction of secondary control loop, effectively improving the sampling accuracy and system operation stability of reactive power compensation, reducing the operation and maintenance cost of equipment, and adapting to the low voltage distribution scene of double power supply single-sided transformer power supply and single capacitor cabinet sharing.

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