Distribution box is a massive data on the parameters, generally constitute a low-voltage forest according to the electrical wiring requirements of the switchgear, measuring instruments, protective appliances and auxiliary equipment assembled in a closed or semi-enclosed metal cabinet or screen to form a low-voltage power distribution box. In normal operation, the circuit can be switched on or off by manual or automatic switch.
Switch cabinet (switch cabinet) is an electrical equipment, switch cabinet outside the first access to the main control switch cabinet, and then enter the sub-control switch, the shunt according to their needs set. Such as instruments, automatic control, motor magnetic switches, all kinds of AC contactor, and some also set high voltage room and low voltage room switchgear, with high voltage bus, such as power plants, and some also have to protect the main equipment of the low week Loaded.
The main function of the switchgear is to open and close, control and protect the electrical equipment in the process of power generation, transmission, distribution and power conversion. Components in the switchgear are mainly circuit breakers, disconnectors, load switches, operating mechanisms, transformers and various protection devices. There are many ways to classify switchgear, for example, it can be divided into switchgear and fixed switchgear through circuit breaker installation. Or according to the structure of cabinet, it can be divided into open type switchgear, metal enclosed switchgear, and metal Closed armored switchgear; according to the different voltage levels can be divided into high voltage switchgear, medium voltage switchgear and low voltage switchgear. Mainly used in power plants, substations, petrochemicals, metallurgical steel rolling, light industry and textile, factories and mines and residential quarters, high-rise buildings and other different occasions.
Rural low-voltage electrical operation of the general provisions?
1, low-voltage electrical operation should fill in the operating ticket (see Appendix D), but only stop (send) a shunt and the operation of the project does not exceed 3, the item may not fill in the operation ticket. Where there is hanging, demolition of the ground operation, should fill out the operation vote. Before operation, check the field equipment name, number, switch and knife switch's position and closing position according to the low voltage system simulation board and operation sequence. After the operation is completed, a full inspection should be carried out.
2, the electrical operation sequence: the power outage should be opened before the switch, switch off the knife switch; power transmission and reverse the above sequence of operations.
3, Knife switch, when the knife switch moving contact close to the static contact, the knife switch should be quickly incorporated, but when the knife switch moving contact near the closing end, there should be no impact; Broach switch, when Moving contact is about to leave the static contact should be quickly disconnected, and then operate to the end.
4, switch, knife switch operation, should be checked. After the closing, should check the three-phase contact is good, even with the operating handle (handle) is braking well; after the brake, should check the three-phase dynamic and static contact is disconnected, moving contact and static contact Between the air distance is qualified, even with the operating handle (handle) is braking well.
5, if the operation found abnormal or abnormal problems, should stop operating until the problem is identified and dealt with before they can continue to operate.
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