The Role Of The Isolating Switch

The main functions of Isolator switch are to isolate power supply, perform switching operation, and connect or disconnect low-current circuits.

Isolate power supply: Reliably isolate the electrical equipment or lines that need to be repaired from the energized power grid to ensure the safety of the maintenance personnel. This is the most basic and important function of the disconnector. During the maintenance process, by operating the disconnector, an obvious disconnection point can be formed, so that the electrical equipment is completely separated from the power supply, thereby avoiding the passage of current and ensuring the safety of the maintenance personnel.
Switching operation: In a double-bus circuit, the disconnector can also be used for switching operation, that is, switching the electrical equipment or power supply line from one set of busbars to another set of busbars to achieve a change in the operating mode. This operation is very common in power systems and is used to adjust the operating mode of the power system and improve the flexibility and reliability of the power system.
Connect or disconnect low-current circuits: Although the disconnector has no arc extinguishing ability and cannot be used to cut off large load currents and short-circuit currents, it can be used to connect or disconnect circuits when the current is very small and the capacity is very low. This function also has certain applications in power systems, such as opening and closing unloaded busbars and equipment directly connected to the busbars for trouble-free operation.

In summary, disconnectors play a vital role in power systems and are one of the important devices to ensure the safe operation of power systems.