Because disappear arc is encircled can effectively restricts fault current of single-phase ground connection, although blame breakdown is opposite ground voltage is times more elevatory, line voltage still is balanced between three-phase lead, the dynamo can be avoided for asymmetry bear, power system can continue to move. It is especially when power source insecurity or power cut consequence are serious, enough time is started reserve power source or move bear, avoid to be interrupted suddenly be immersed in passive situation to the power supply of the user.
When system of ground connection of coil of arc of disappear of neutral site classics produces breakdown of single-phase ground connection, ground connection electric current and the place that breakdown chooses have nothing to do. Because incomplete shedding is very small, ground connection electric arc can go out for an instant, effectively restricted the harm action of electric arc overvoltage. Protection and automatic device, lightning arrester, lightning rod, can protect institute of specific facility, plant and line only, and disappear arc coil can make the breakdown of odd conterminous ground of great majority does not develop however for alternate with short circuit, the dynamo can be avoided for short-circuit current, the equipment such as transformer can avoid the concussion that suffers short-circuit current, protection and automatic device need not movement, breaker need not movement, protect action to be in the facilities of full electric power in the system to all have thereby.
Of disappear arc coil answering speed also is a very important parameter, when producing breakdown of single-phase ground connection, if need to amount to the time of several seconds even through a few millisecond,ability can cast disappear arc to encircle, older and older to receiving ground electricity at present system will tell, already more and more incommensurate. Ideal the way to deal with a situation is to use the disappear arc coil that answers quickly to restrain arc ground connection what removing arc is flashy, this asks arc system has disappear to answer speed lickety-split. In the meantime, in moving actually (be in especially thunderstorm season) can produce cutty of be apart time continuously normally for many times breakdown of single-phase ground connection (for example some stands in season of a thunderstorm to already recorded be apart, arc coil must have disappear to answer speed lickety-split, ability is compensated effectively and remove these trouble, the safety that assures a system moves.
Domestic some neutral nod the disappear arc that needs to add damp resistance to encircle a system, answer speed to rise, use the working means of preliminary adjustments, the archives with when having breakdown namely, already moved disappear arc coil to computation good, when should producing breakdown of single-phase ground connection again short receive damp resistor. This kind of means, still often want damp of be enslaved to be enslaved to resistor weak point receives an orgnaization (contactor and multistage auxiliary relay) the influence that handles time, rise hard also so answer speed. Use pilot of silicon controlled rectifier disappear arc coil, can answer quickly inside a few millisecond conterminously to sheet, should be to dog automatically the development direction that controls disappear arc coil. Somebody worries about the dependability problem of silicon controlled rectifier, actually this basically depends on the operating condition of the type selecting of silicon controlled rectifier, silicon controlled rectifier (namely the control means of disappear arc coil) etc. Even if homebred high-power silicon controlled rectifier, day is new the experience that electric disappear arc coil already had result of a few the year's harvest to move in certain and large power station, if type selecting is correct, apply appropriate, the reliability of silicon controlled rectifier is quite high still.
Current society, a variety of information processing systems apply extensively at each respects of production of national defence, society, life, but ability of its interference rejection is very poor however, compatible problem becomes electromagnetism a brand-new research domain. Strong report disturbs weak report, power system is contradictory main field. Best means of settlement is to introduce fiber-optic, existing however investment increases. Actually, because neuter orders system of ground connection of coil of classics disappear arc,restrict fault current of single-phase ground connection effectively, so can yet be regarded as the way with a kind of efficient economy, compensation system can offer good electromagnetism to communication system compatible environment.
