Self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker
A high current, air blowing technology, applied in the field of current limiting, can solve the problems of reduced life, difficult to achieve the air blowing effect, limited movement speed of the mechanism, etc., and achieve the effect of increasing the recovery strength.
Inactive Publication Date: 2010-07-28
XI AN JIAOTONG UNIV +1
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Problems solved by technology
However, this method requires a separate air blowing mechanism, and requires a high degree of sealing and a huge volume, which is not suitable for medium-voltage fast DC circuit breakers.
The second type is used in the low-voltage field. After the circuit breaker arcs, the piston mechanism is used to force air blowing to the arcing area. However, the movement speed of the mechanism is limited, and it is difficult to achieve a good air blowing effect.
However, in the case of medium voltage and high current, after the short-circuit capacity is increased, if the gas-generating material is placed in the arcing area, it will gasify in large quantities during arcing, and the service life will be greatly reduced, so it is not suitable for medium-voltage fast DC circuit breakers. use
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[0017] The structure and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments of double fractures.
[0018] see Figure 1-4 , the preferred embodiment of the present invention is a bridge-type contact double-break circuit breaker, which includes a contact system 2 and arc extinguishing chambers 3 arranged on both sides of the contact system 2. The said contact system 2 includes a moving contact 7, a static The conductive circuit formed by the contact 8 and the current incoming line 11 connected to the static contact 8 and the current outgoing line 12, the two static contacts 8 are connected through the static contact insulating baffle 14, and the upper end of the moving contact 7 is set There is an air blowing system housing 1 compatible with the moving contact 7, and the two sides of the moving and static contacts 7 and 8 in the air blowing system housing 1 are respectively...
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The invention discloses a self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker. An insulating baffle is arranged to design a space round a contact system so as to achieve the purpose of utilizing self energy of an electric arc to exert the function of high-speed air flow arc blowing without an additional air blowing mechanism. The strong air blowing function can shorten the stagnation time of the electric arc, accelerate the electric arc to transfer from a contact to an arc way, lead the electric arc to quickly enter an arc extinguishing chamber, and shorten the on-off time, thereby realizing the purpose of quicker short-circuit current limiting.
Description
technical field [0001] The invention relates to a current-limiting technology applied to a medium-voltage direct current high-current circuit breaker, in particular to a self-energy blown medium-voltage high-current direct current fast current-limiting circuit breaker. Background technique [0002] The connection between DC power supply system and people's daily life is getting closer and closer. At present, DC power supply system is used in many important industries such as urban trolleybus, subway, smelting, chemical industry, rolling material, ship power, mining and so on. Among them, the DC circuit breaker is the guarantee for the safe operation of the DC power supply system, and has the protection function of reliably cutting off the fault current of the DC circuit. With the rapid development of my country's economy and the gradual modernization of the industrial and transportation sector, the requirements for the reliability of the power supply system are becoming more...
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IPC IPC(8): H01H73/18
Inventor 杨飞荣命哲吴翊王伟宗王小华刘懿莹
Owner XI AN JIAOTONG UNIV