What is the role of the isolating switch ? The difference between the circuit breaker and the isolating switch
The role of the isolating switch is:
1) After the opening, establish a reliable insulation gap, and separate the equipment or line that needs to be repaired from the power supply with an obvious disconnection point to ensure the safety of the maintenance personnel and equipment.
2) Change the line according to the operation needs.
3) It can be used to divide and combine small currents in the line, such as casing, busbar, connector, short cable charging current, capacitor equalizing capacitor capacitance current, double busbar switching current and voltage transformer excitation current Wait.
4) According to the specific conditions of different structure types, it can be used to separate and combine the no-load excitation current of a certain capacity transformer.
The circuit breaker, also known as the air switch, is an electrical appliance that has both manual switching and automatic voltage loss, undervoltage, overload, and short circuit protection. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, and automatically cut off circuits when they are severely overloaded or short-circuited or under-voltage faults. Their functions are equivalent to fuse switches and A combination of under-heat relays, etc. Moreover, it is generally not necessary to change parts after breaking the fault current, and has been widely used.
The circuit breaker ( or switch ) is the main power control device of the substation . It has arc-extinguishing characteristics . When the system is in normal operation , it can cut off and turn on the no-load and load current of the line and various electrical equipment ; when the system occurs fault, and with the protection it can quickly cut off the fault current to prevent the expansion of scope of the accident therefore, the quality of high-voltage circuit breakers work directly affect the safe operation of the power system; many types of high-voltage circuit breaker, according to extinguish The difference of arc can be divided into: oil circuit breaker (multi-oil circuit breaker, oil-less circuit breaker), sulfur hexafluoride circuit breaker ( SF6 circuit breaker), vacuum circuit breaker, compressed air circuit breaker and so on.
Selection and type of isolating switch : indoor high-voltage isolating switch has two kinds of single-pole and three-pole type, generally knife-type isolating switch, usually the movable contact ( gate ) is installed perpendicularly to the shaft of the post insulator, and Most of the conductor blade contacts are used. Figure 1 shows the outline structure of the indoor GN-10 isolation switch. It can be seen from the figure that the three common bases of the high-voltage isolating switch are clamped on both sides of the static contact by the spring pressure, so that the moving and static contacts ( one pole ) are two parallel rectangular cutters, and the spring pressure is utilized. , clamped on both sides of the static contact, so that the moving and static contacts form a good line contact. The movable contact knife brake rotates by operating the insulator, and the operating insulator is connected with the knife gate and the spindle arm, and the high-voltage isolating switch can be divided and operated.
It can be seen from the above that the main difference between the circuit breaker and the isolating switch is that the circuit breaker has the ability to extinguish the arc, and the isolating switch does not.
Closing: first disconnecting switch, rear closing circuit breaker;
Opening: First divide the circuit breaker, then divide the isolation switch. (China electrical equipment to provide network support, collaborative B2B Website Daquan http://hao.cngaoge.cn)
Related isolation switch article reading :
HGW9-10/630A isolation switch http://?id=50
GW9-10/630A high voltage isolation switch http://?id=49
Isolation switch grounding requirements http://?id=123
High voltage isolation switch installation method http://?id=119
Circuit breaker and disconnector http://?id=49
Isolation switch selection http://?id=100
The role of the isolating switch http://?id=79
The field of isolating switch applications http://?id=108
Fuse high voltage fuse http:// high voltage current limiting fuse
High voltage fuse http://?id=3
China Electric Network http:// B2B Website Navigation http://hao.cngaoge.cn