In Shenzhen city strong report tells staff of research and development of limited company of science and technology in, have many country to register electric engineer, have rich building electric design experience, through us technical personnel is opposite the analysis of use situation of product of switch of double power source in the building and research, think to use contactor as box of illume of the lash-up in the building in component of switch of double power source, it is a kind of very good choice. In the occasion that uses switch of double power source in the building, product of switch of double power source occupies 60% above in the application of box of lash-up illume distribution, the integral cost of the plan that adopts contactor to make switch of double power source as a result of this kind is low, use plan of this kind of double power source to be able to reduce estate to develop the investment that the enterprise is building box of the distribution in the project to go up so, reduce the cost expenditure of the enterprise, enhance business market competition ability.

Want in the box of lash-up illume distribution in the building by power supply of double power source, realize automatic switch inside distribution box, the device of switch of double power source of herein has a few characteristics:

1. How is the switch electric current of here counted not quite, do not exceed 100A commonly.

2. Because the bulk of box of lash-up illume distribution is restricted, the bulk that asks double power source cuts buy of transhipment of through cargo wants small, the volume that can cause case of lash-up illume distribution otherwise is too large, cause box of lash-up illume distribution to install the difficulty that go up. E.g. box of lash-up illume distribution installation is inside strong report shaft, if volume of case of lash-up illume distribution is too large, the installation that can create the facility inside shaft is difficult.

The device of switch of double power source in making case of lash-up illume distribution with contactor is a kind of very good choice, contactor is the control electric equipment with a kind of use very very long, honest history, what contactor basically applies in electromotor is frequent open, stop control, OK also of course on the control of illume bear applying, the rigid structure of contactor simple and have very long electric life, the electric life that contactor has 500 thousand ～ generally 1 million times, a the mainest characteristic is: The volume of the contactor under 100A is minor, majority has the kind that slideway installs, can very convenient with box of lash-up illume distribution medium small break the means installation that uses slideway installation jointly, the double power source in using contactor to regard lash-up illume distribution as box so cuts buy of transhipment of through cargo, it is a kind of very good choice.

The double power source in using contactor to regard lash-up illume distribution as box cuts buy of transhipment of through cargo, be not is to let everybody use inchoate the sort of using auxiliary relay and contactor take the plan that accepts a circuitry to realize switch of double power source, means of switch of this kind of double power source, can say only going up is plan of a kind of simple and easy switch of double power source, the expression in using comes out to have a lot of problems, a the biggest drawback is power source detects not comprehensive, because auxiliary relay coil has two terminal only, without giving thought to how wiring, can detect only one or whether is phone broken on two-phase, voltage of on-line of the 3rd photograph does not detect anyhow, if this did not receive auxiliary relay look line of commonly used power source appeared to break a string, only two-phase has report in three-phase power source, it is a kind of serious power source breakdown, build the plan of switch of double power source that accepts control line logic to cannot appear in commonly used power source with relay this kind of breakdown when switch arrives reserve power source goes up; In addition, if voltage exorbitant on the high side, the means of switch of double power source that with relay control line road comes true also cannot switch, and this kind of breakdown is to happen likely, if work,for instance 0 lines were broken, and bear lopsided, give Xian Mou phase voltage likely special on the high side, at the same time some phase voltage the circumstance of on the low side, breakdown of this kind of power source can cause the many equipment breakdown that use phone, and appear when breakdown of this kind of power source, auxiliary relay is won't of the movement, contactor also won't automatic switch arrives reserve on power source. Means of this kind of simple and easy switch of double power source is in the circumstance of a variety of power source breakdown cannot switch, just be in situation of specific power source breakdown (three-phase of commonly used power source cuts off the power at the same time, or the look line that receives auxiliary relay cuts off the power) next ability switch, so the means of switch of this kind of double power source is fluky. The national level that in October 2002 the country rolled out ATSE " GB/T14048.11-2002 " in, clear specification ATSE must be in the switch when one phase voltage is unusual goes to the random of commonly used power source reserve power source goes up, take plan of received switch of double power source with auxiliary relay and contactor so, of the requirement in the national level that is switch of not contented double power source.
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