Introduction of model and characteristics of knife switch

Electricity is very dangerous in our life. Knife switches are generally used to control electricity and appliances. Knife switch can not only ensure our life safety, but also be very accurate when controlling electricity. Knife switch is mainly used for "isolating power supply, switching operation, connecting and cutting off small current circuit" and has no arc extinguishing function. Moreover, there are many kinds of knife switches, and with the development of science and technology, knife switches are becoming more and more automatic. Then Bian Xiao will tell you about the knife switch.

Knife switch model

Disconnector (switch), that is, when in the separation position, there is an insulation distance between contacts that meets the specified requirements and obvious disconnection signs; When in the closed position, it can withstand the current under normal loop conditions and the current under abnormal conditions (such as short circuit) within the specified time. (IEV44 1- 14-05)

Common high-voltage isolating switch models

CR, central isolating switch (126kV~252kV)

DR, bilateral disconnector (72.5kV~363kV)

KR, double-column horizontal telescopic disconnector (126kV~550kV)

PR, single-column double-arm vertical telescopic disconnector (126kV? Where to? 500 kV)

SR, horizontally rotating single-side isolating switch (40.5kV)

VR, V-type central isolating switch (126kV)

YR, single column and single arm vertical telescopic disconnector (126kV~550kV)

Primary circuit breaker

DW series high-voltage outdoor installation multi-oil circuit breaker

Installation of SW series outdoor high-voltage low-oil circuit breaker

High voltage indoor installation of SN series low oil circuit breaker

ZW series high-voltage outdoor installation vacuum circuit breaker

ZN series high-voltage indoor vacuum circuit breaker LW series high-voltage outdoor SF6 circuit breaker

Indoor Installation of SF6 Circuit Breaker LN Series High Voltage

Characteristics of knife switch

1. When electrical equipment is overhauled, providing an electrical interval is an obvious disconnection point to ensure the personal safety of maintenance personnel.

2. The disconnector can't run with load: it can't run with rated load or heavy load, and it can't separate load current and short-circuit current, but it can run with light load and no-load line when there is an interrupter.

3. General power transmission operation: close the isolating switch first, and then close the circuit breaker or load switch; During power-off operation: disconnect the circuit breaker or load switch first, and then disconnect the disconnector.

4. The selection is the same as that of other electrical equipment, and its rated voltage, rated current, dynamic stable current and thermal stable current must meet the needs of use occasions.

The function of the disconnector is to disconnect the circuit of no-load current, so that the equipment to be overhauled has an obvious disconnection point with the power supply, so as to ensure the safety of the maintenance personnel. The disconnector can't cut off the load current and short-circuit current without special arc extinguishing device, so it can only be operated when the circuit breaker opens the circuit.

Knife switch function

1. It is used to isolate the power supply and disconnect the high-voltage maintenance equipment from the live equipment, so that there is a clearly visible disconnection point between them.

2. According to the needs of the system operation mode, the disconnector cooperates with the circuit breaker to open the brake, thus changing the wiring mode of the system operation.

3. Used to connect or disconnect the small current circuit.

Generally, a set of isolating switches are installed on the front and back sides of the circuit breaker, in order to isolate the circuit breaker from the power supply and form an obvious disconnection point; Because the original circuit breaker is an oil circuit breaker, the oil circuit breaker needs frequent maintenance, so there should be obvious disconnection points on both sides to facilitate maintenance; Under normal circumstances, the outlet cabinet is powered off from the upper bus through the switch cabinet, and a set of isolating switches is needed to isolate it from the power supply before the circuit breaker. But sometimes, there is the possibility of incoming calls behind the circuit breaker, such as reverse transmission through other circuits and capacitors, so a set of isolating switches is also needed behind the circuit breaker.

The above is the basic knowledge about knife switch that Bian Xiao shared in detail. I hope our sharing can help everyone. Knife switches are widely used in circuits and electrical appliances. Knife switch can not only ensure the personal safety of maintenance personnel, but also be very convenient in controlling circuits and electrical appliances. There are many kinds of knife switches, among which the most common ones are low-voltage disconnectors and high-voltage disconnectors. At the same time, pay attention to the maintenance of the knife switch when using it.

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