Detection circuit of open circuit of operating mechanism opening coil and detection method thereof

Abstract

The invention relates to a detection circuit of the open circuit of an operating mechanism opening coil and a detection method thereof. The detection circuit comprises a breaker opening coil TQ, an operating circuit positive power supply +KM, an operating circuit negative power supply -KM, an optoelectronic isolator OC1 and an optoelectronic isolator OC2. The detection method is characterized in that the input pin 2 of the optoelectronic isolator OC1 is grounded, and the other input pin 1 of the optoelectronic isolator OC1 is connected with the output pin 3 of a singlechip; the output pin 3 of the optoelectronic isolator OC1 is connected with the operating circuit positive power supply +KM, and the other output pin 4 of the optoelectronic isolator OC1 is connected with the input pin 1 of the optoelectronic isolator OC2; the input pin 2 of the optoelectronic isolator OC2 is sequentially connected with the breaker opening coil TQ and the operating circuit negative power supply -KM; the output pin 3 of the optoelectronic isolator OC2 is grounded; the output pin 4 of the optoelectronic isolator OC2 is branched into two ways to be respectively connected with a power supply VCC (Voltage To Current Converter) and the detection pin 2 of the singlechip; and the singlechip is connected with an alarm circuit. The detection circuit disclosed by the invention has the advantages of simpler structure, more convenience for implementation and operation and suitability for the detection of the open circuit of the operating mechanism opening coil or the improvement of similar methods.

Description

technical field [0001] The invention relates to an open circuit detection circuit of an opening coil of an operating mechanism, and relates to an open circuit detection circuit and a detection method for the opening coil of an operating mechanism. Background technique [0002] The opening coil is the final executive element of the control and protection circuit of the power system, and one of the important components in the electromagnetic operating mechanism of the high-voltage circuit breaker, which plays a decisive role in the safe and reliable operation of the power system. The existing opening coils are designed according to the short-time electrification. If there are problems such as improper coordination between the circuit breaker mechanism and the auxiliary switch, failure of the auxiliary switch, or mechanism jamming during opening, the auxiliary switch node will not be disconnected in time. The gate circuit will be self-maintained for a long time, that is, the op...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above problems, the object of the present invention is to provide the field with an operating mechanism opening coil open circuit detection circuit and its detection method, so as to solve the existing technology that the operating mechanism opening coil open circuit detection is relatively difficult and inconvenient to implement. question

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