Switchgear comprises various components, including circuit breakers, disconnect switches, fuses, relays, control panels, and transformers. These components are designed to function together to achieve the desired protection, control, and reliability of the electrical power system.
Circuit Breakers: Circuit breakers are devices used to break or interrupt the flow of electrical current when there is an electrical fault or overload. They protect the electrical system from damage due to excess current. Circuit breakers are available in various types, including air, oil, and vacuum circuit breakers.
Disconnect Switches: Disconnect switches are used to isolate the electrical system for maintenance or repair. They are manually operated and are usually installed in series with the circuit breaker.
Fuses: Fuses are devices that protect the electrical system from overload. They contain a thin wire that melts when the current exceeds the rated value, thus breaking the circuit.
Relays: Relays are devices that detect abnormal conditions in the electrical system and trigger the protective devices to operate. They can be electromechanical or solid-state relays.
Control Panels: Control panels are used to monitor and control the electrical system. They contain meters, switches, and indicators that provide information about the system’s performance.
Transformers: Transformers are used to increase or decrease the voltage of the electrical system. They are used for power transmission and distribution.