Isolation/disconnector switch is a switching device mainly used for isolating power sources, switching operations, and connecting and disconnecting small current circuits. It does not have arc extinguishing function, so it cannot carry load current or short-circuit current when opening and closing circuits. Isolation switches are mainly used in high-voltage power systems, with rated voltages typically above 1kV. Its main uses include: Isolation voltage: During maintenance and repair, use isolation switches to isolate electrical equipment from the operating power grid, ensuring safe operation and maintenance. Switching operation: used to activate the standby bus or change the operating mode, and cooperate with the circuit breaker to complete the operation. Connect and disconnect low current circuits, such as voltage transformers, lightning arresters, no-load lines, and no-load transformers. Structure and characteristics The contacts of the isolation/disconnector switch are all exposed in the air and have obvious disconnection points. Due to its lack of arc extinguishing device, it cannot be used to cut off load current or short-circuit current. If the isolation/disconnector switch is operated under load, it may cause strong arcing and even lead to equipment damage and personal safety risks. Application scenarios Isolation/disconnector switches are widely used in high-voltage distribution systems such as substations and power plants. Its main function is to reliably isolate the parts that need to be powered off from the live parts to ensure the safety of maintenance work. In addition, isolation/disconnector switches are also used to change the operating mode of the system, such as switching between running circuits in a dual bus circuit.
