Fixed high-voltage switch cabinet interlocking mechanism

Abstract

The invention discloses a fixed high-voltage switch cabinet interlocking mechanism. A circuit breaker spindle is connected with and drives a crank arm and a roller to rotate clockwise or anticlockwise; a third lock bar is pushed inwards or outwards under the action of a returning spring so as to be unlocked or locked with a second lock bar fixed on an ejector rod; the second lock bar fixed on the ejector rod is unlocked or locked so as to unlock or lock the ejector rod; the end of a rotating shaft is connected with a baffle plate, below which the ejector rod is arranged to be vertical with the baffle plate; a first lock bar and the second lock bar are arranged on the ejector rod; the returning spring is arranged outside the third lock rod; an operation handle is connected with a push rod; and the rotating shaft is connected with an opening button lock bar and a closing button lock bar and controls the opening button and the closing button of a circuit breaker respectively. According to the fixed high-voltage switch cabinet interlocking mechanism, a mechanical interlocking mechanism is added between the circuit breaker and an operating mechanism inside a high-voltage switch cabinet to realize a safer 'five prevention' interlocking function of the fixed high-voltage switch cabinet, and an active locking way is adopted to realize the interlocking function.

Description

technical field [0001] The invention relates to an operating mechanism of a high-voltage switchgear used in the electric power industry, in particular to an interlocking mechanism between the operating mechanism of a high-voltage switchgear and a circuit breaker, that is, a fixed high-voltage switchgear interlocking mechanism. Background technique [0002] In the substation where the power system operates, the operation of the isolating switch, circuit breaker, grounding switch and the opening of the cabinet door of the high-voltage switchgear need to meet the "five-proof" interlocking requirements, that is, to prevent the load from opening and closing the isolating switch; Prevent mis-disconnection and closing of circuit breakers; prevent grounding wires from closing disconnectors; prevent live wires from being connected to ground wires; prevent accidental entry into live intervals. At present, there are many types of operating mechanisms for fixed high-voltage switchgear, ...

AI Technical Summary

Problems solved by technology

At present, there are many types of operating mechanisms for fixed high-voltage switchgear, and the interlocking between them and the circuit breaker is also in various forms. Some of them are rigid interlocking mechanisms made of cast iron. The reliability is poor, and the installation is concealed, invisible, and the operation is not intuitive and clear, and the fault cannot be found and eliminated in the first time, which can easily cause misoperation and destructive operation, resulting in safety hazards and equipment damage; some use motorcycle brake lines It is made into a soft interlocking mechanism, but due to the frequent operation of the isolating switch and the hard impact when the circuit breaker opens and closes, it is easy to cause the broken wires and strands of the motorcycle brake line until the interlocking function is lost at last, which brings hidden dangers to safe operation; Others use the method of program lock to realize the "five defenses" interlocking. The program is complicated and the operation is slow, requiring the operator to have a clear mind and a high degree of proficiency in operation. The linkage between the operating mechanism and the circuit breaker is a passive linkage, that is, when the circuit breaker is closed, the opening operation of the isolating switch is realized by passively tripping the circuit breaker through the operating mechanism, and some operating mechanisms are in the operable state of the isolating switch. The remote electric closing operation of the circuit breaker can still be performed, so there are certain safety hazards and the possibility of misoperation, and the accident of the circuit breaker closing coil burning out will affect the reliability of power supply

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