Protection method for three-phase contacts of circuit breaker, shunt release and circuit breaker
A technology of shunt release and circuit breaker, which is applied in the direction of protection switch operation/release mechanism, etc., which can solve the problems of unbalanced burning of three-phase contacts, etc., and achieve the effect of protection and prolonging the service life
Active Publication Date: 2017-08-11
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a protection method for the three-phase contacts of the circuit breaker, which can effectively solve the problem of unbalanced burning of the three-phase contacts of the circuit breaker and prolong the service life of the circuit breaker
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Embodiment Construction
[0029] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0030] In order to eliminate the unbalanced burning loss phenomenon of the three-phase contacts of the circuit breaker existing in the prior art, it is first necessary to analyze its formation mechanism in detail.
[0031] The shunt release is the main actuator for the electric opening of the circuit breaker. Its working principle is that through the connection of the shunt coil power supply circuit in the shunt release, the shunt release converts electrical energy into mechanical energy, and through mechanical coupling, the circuit breaker operating mechanism is unlocked to open the circuit breaker. The existing shunt release that extracts energy from the main circuit for power supply does not necessarily act immediately after receiving the opening command. When the power supply circuit of the shunt coil of the shunt release is connected, the shunt rel...
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The invention discloses a breaker three-phase contact protection method and belongs to the technical field of low-voltage apparatus. According to the protection method, in the switching-off process every time, electric energy is supplied to a shunt excitation coil according to different time delay durations, so the situation that one contact or two contacts among breaker three-phase contacts bear the largest turn-off current all the time in the switching-off process is avoided. The invention further discloses a shunt release and a breaker. According to the breaker three-phase contact protection method, the shunt release and the breaker, the influence of the switching-off synchronous effect is effectively overcome, and equilibrium distribution of burning losses of the breaker three-phase contacts is achieved not like the situation that in the prior art, burning losses are centralized to one contact or two contacts, so the three-phase contacts are effectively protected, and the service life of the breaker is prolonged.
Description
technical field [0001] The invention relates to a method for protecting a three-phase contact of a circuit breaker, belonging to the technical field of low-voltage electrical appliances. Background technique [0002] With the rapid development of circuit breaker technology, the requirements for power distribution are getting higher and higher, and the requirements for circuit breakers are also getting higher and higher. High breaking and long life are its important manifestations. [0003] Usually, the shunt release is used as the main actuator for the electric opening of the circuit breaker. Its working principle is that through the connection of the shunt coil power supply circuit in the shunt release, the shunt release converts electrical energy into mechanical energy, and through mechanical coupling, the circuit breaker operating mechanism is unlocked to open the circuit breaker. [0004] The existing shunt tripper usually uses the energy-taking circuit to obtain electr...
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IPC IPC(8): H01H71/24H01H71/44
CPCH01H71/24H01H71/44
Inventor 朱冬明毛振风周敏琛管瑞良
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)