What are the functions of the disconnect switch

Thedisconnect switch is a kind of switching device mainly used for isolating power supply, switching operation, connecting and cutting off small current circuits, and has no arc extinguishing function. When the disconnect switch is in the sub-position, there is an insulation distance that meets the specified requirements and an obvious disconnection mark between the contacts. When in the closed position, the switchgear can carry the current under normal loop conditions and the current under abnormal conditions within a specified time. The disconnect switch has many functions, so what is the function of the disconnect switch? Next, let's go take a look.

This is the content list:

• The secondary function of the disconnect switch

• The main function of the disconnect switch

The secondary function of the disconnect switch

After the disconnect switch is opened, a reliable insulation gap is established, and the equipment or lines that need to be overhauled are separated from the power supply with an obvious disconnection point to ensure the safety of overhaul personnel and equipment. According to operational needs, switch lines. Disconnect switches can be used to separate and close small currents in the circuit, such as the charging current of bushings, bus bars, connectors, short cables, the capacitance current of the switch voltage equalizing capacitor, the circulating current during double bus switching, and the excitation current of the voltage transformer Wait. The disconnect switch can be used to divide and close the no-load excitation current of a certain capacity transformer according to the specific conditions of different structure types.

The main function of the disconnect switch

The main function of the disconnect switch is to disconnect and connect the line without load. The disconnect switch is used to turn on or off the small current circuit. Generally, a set of disconnect switches are installed on each of the fronts and rear sides of the circuit breaker to isolate the circuit breaker from the power supply to form an obvious disconnection point. Because the original circuit breaker is an oil circuit breaker, the oil circuit breaker needs to be overhauled frequently, so there must be obvious disconnect points on both sides to facilitate the overhaul. Under normal circumstances, the outlet cabinet is powered down from the upper bus bar through the switch cabinet. A set of disconnect switches is required in front of the circuit breaker to isolate from the power supply, but sometimes there may be incoming calls behind the circuit breaker, such as through the reverse of other loops. It also needs a set of disconnect switches behind the circuit breaker.

The disconnect switch has no arc extinguishing device, so it cannot be used to cut offload current or short-circuit current. Otherwise, under the action of high voltage, the disconnection point will produce a strong arc, and it is difficult to extinguish by itself, and may even cause arcing, burning equipment, and endanger personal safety. The disconnect switch can also be used to switch some circuits to change the operating mode of the system.

Haivo Electric Co., Ltd. is a global supplier of electrical equipment and services. A lot of technical force and capital investment has been injected into the manufacturing of disconnect switches, and we are committed to producing better disconnect switches. If you are interested in disconnect switches, you can contact us. Our website is https://www.haivofusecutout. com/.