What are the classifications of switchgear?

Switchgear can be classified in various ways, mainly according to voltage level, application, structure, installation environment, and function. Different classification methods are suitable for different scenarios, and proper selection can effectively improve the safety and efficiency of the power system.

 

1. Classification by Voltage Level

Low-voltage switchgear: Used in power systems below 500V, commonly found in buildings, factories, and other end-user locations, such as models GGD, GCK, GCS, and MNS.

Medium-voltage switchgear: Suitable for 3kV, 6kV, and 10kV systems, mostly used in industrial distribution rooms or substations, such as the KYN28-12 medium-voltage switchgear.

High-voltage switchgear: Used in 24kV, 35kV, and above systems, commonly found in large substations and new energy power plants.

 

2. Classification by Application

Incoming line cabinet: Receives electrical energy from transformers or upstream power sources; it is the "entry point" of the entire power distribution system. Outgoing Line Cabinet: Distributes electrical energy to specific electrical equipment or downstream distribution boxes.

Bus Link Cabinet: Connects and switches between multiple busbar sections, improving power supply reliability.

Metering Cabinet: Contains an energy meter for electricity consumption statistics and billing.

Capacitor Compensation Cabinet (Compensation Cabinet): Improves power factor and reduces line losses by connecting capacitors in parallel.

PT Cabinet (Voltage Transformer Cabinet): Used for voltage measurement and relay protection.

UPS/Emergency Power Supply Cabinet: Provides uninterrupted power or emergency power to critical equipment.

 

3. Classification by Structural Form

Fixed Distribution Cabinet: Such as the GGD type, simple in structure and low in cost, but requires power disconnection for maintenance; suitable for applications with few circuits and stable loads.

Drawer-type (pull-out) distribution cabinets: such as GCK, GCS, MNS, which install circuit breakers and other components in pull-out drawers, making maintenance convenient and not affecting the operation of other circuits. They are suitable for scenarios with concentrated loads and many circuits.