Today I introduce to you the analysis of the basic requirements of the circuit breaker control circuit, do you understand?
(1) There should be a monitoring circuit for the control power supply. The control power of the circuit breaker is the most important. Once the power circuit breaker is lost, it cannot be operated. Therefore, no matter what the reason is, when the circuit breaker control power supply disappears, it should send out sound and light signals to remind the duty personnel to deal with it in time. For the remote control substation, the disappearance of the circuit breaker control power supply should send a remote signal.
(2) There should be an electrical blocking device to prevent the circuit breaker from "jumping". The occurrence of "jumping" is very dangerous to the circuit breaker, which can easily cause damage to the mechanism and even cause the circuit breaker to explode. Therefore, blocking measures must be taken. The "jumping" phenomenon of the circuit breaker generally occurs only when the tripping and closing circuits are connected at the same time. The design of the "anti-jump" circuit should be such that when the circuit breaker "jumps", the circuit breaker is locked to the trip position.
(3) The integrity of circuit breaker tripping and closing circuits should be constantly monitored. When the tripping or closing circuit fails, the circuit breaker control circuit disconnect signal should be issued.
(4) There should be an obvious position signal for the closing and tripping status of the circuit breaker, and there should be an obvious action signal when the fault automatically trips and automatically closes.
(5) The trip and close commands should be kept long enough, and when the trip or close is completed, the command pulse should be automatically released. The mechanism action of the circuit breaker needs a certain time, and the main contact must have a certain stroke when it reaches the specified position when it is closed. These add ups are the inherent action time of the circuit breaker and the arc extinguishing time. The command is kept long enough to ensure that the circuit breaker can reliably trip and close. In order to speed up the action of the circuit breaker and increase the growth rate of the current in the tripping and closing coils, the inductance of the tripping and closing coils should be reduced as much as possible. For this reason, the tripping and closing coils are designed for short-lived charging. Therefore, after the tripping operation is completed, the tripping circuit must be automatically opened, otherwise, the tripping or closing coil will burn out. The auxiliary circuit breaker's auxiliary contacts usually automatically open the trip circuit.
(6) When the operating power of the circuit breaker disappears or is insufficient, such as the spring of the spring mechanism is not tensioned, the pressure of the hydraulic or pneumatic mechanism is reduced, etc., the action of the circuit breaker should be blocked and a signal should be issued. When the SF6 gas pressure decreases and the circuit breaker cannot be operated reliably, the action of the circuit breaker should also be blocked and a signal should be issued.
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