Circuit breaker control loop for phase selection opening and closing

Abstract

The invention provides a circuit breaker control loop for phase selection opening and closing. The circuit breaker control loop comprises a measurement and control opening and closing loop, a manual closing and manual opening setting loop, a phase selection / non-phase selection opening and closing loop, a manual closing switching-in starting loop, a protection closing switching-in starting loop, a closing switching-out and holding loop, a jump position monitoring loop, a manual opening switching-in starting loop, a split-phase protection tripping switching-in starting loop, a split-phase tripping switching-out and holding loop, and a closing monitoring loop. According to the circuit breaker control loop for the phase selection opening and closing of the invention, phase selection, non-phase selection and protection opening and closing are carried out through an operation box self-holding loop outlet, so that the reliability of the outlet is ensured; phase-selection / non-phase-selection opening and closing operations can set and reset a closed relay, so that the accuracy of an accident total signal and reclosing logic is ensured; and protection tripping signals do not pass through a remote / local change-over switch of a circuit breaker, so that it can be ensured that the protection quantity is not remotely / locally controlled, the industrial standard is met, and the reliability of the circuit breaker is improved.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a circuit breaker control circuit for phase selection opening and closing. Background technique [0002] Circuit breakers in power systems usually open and close randomly, accompanied by inrush currents and voltage fluctuations. The circuit breaker phase selection opening and closing technology uses certain means to make the moving and static contacts of the circuit breaker open and close at the specified phase angle of the system voltage waveform, reducing the impact of the opening and closing process on the power equipment itself and the system. The phase selection opening and closing device needs to be combined with the circuit breaker phase separation control circuit, and effectively monitor the circuit breaker tripping and closing circuit. [0003] The traditional combination of the phase selection opening and closing device and the circuit breaker phase separation...

AI Technical Summary

Problems solved by technology

[0005] The conventional method has the following problems: first, the phase selection opening and closing operation does not pass through the self-maintaining circuit outlet of the operation box, and the reliability of the outlet cannot be guaranteed; The manual tripping relay and manual closing relay are not connected to the operation box, and the relays are not set and reset after closing, which will affect the accuracy of the important signal of relay protection-the accident total signal, and may interfere with the reclosing of some protective equipment The charging and discharging process of the gate function; third, both the protection trip and the measurement and control trip are activated by the remote / local switch of the circuit breaker to start the trip coil, which does not meet the "DL / T5136-2012 Thermal Power Plant and Substation Secondary Wiring Design Article 5.1.14 of the Technical Specifications: The amount of protection is not controlled by the remote / local switch, and the protection should be directly connected to the strong current circuit to improve the reliability of the work and simplify the input and output

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