The high and low voltage switch cabinet consists of two parts: the cabinet and the circuit breaker, with functions such as overhead inlet and outlet, cable inlet and outlet, and busbar connection.
The cabinet consists of a shell, electrical components (including insulating parts), various mechanisms, secondary terminals and connections.
Cabinet materials
1. Cold-rolled steel plate or angle steel (for welding cabinets); 2. Aluminum-zinc steel plate or galvanized steel plate (for assembling cabinets). 3. Stainless steel plate (non-magnetic). 4. Aluminum plate (non-magnetic).
Cabinet functional unit
1. Main busbar room. 2. Circuit breaker room. 3. Cable room. 4. Relay and instrument room. 5. Cabinet top small busbar room. 6. Secondary terminal room.
Electrical components in the cabinet
1. Commonly used primary electrical components (main circuit equipment) in the cabinet are the following equipment:
1. Current transformer. 2. Voltage transformer. 3. Grounding switch. 4. Lightning arrester (resistance-capacitance absorber). 5. Disconnector. 6. High-voltage circuit breaker. 7. High-voltage contactor. 8. High-voltage fuse. 9. Transformer. 10. High-voltage live display. 11. Insulation parts [such as: wall bushing, contact box, insulator, insulation heat Shrink (cold shrink) sheath]. 12. Main busbar and branch busbar. 13. High-voltage reactor. 14. Load switch. 15. High-voltage single-phase shunt capacitor, etc.
The main secondary components commonly used in the cabinet are the following equipment:
1. Relay. 2. Watt-hour meter. 3. Ampere meter. 4. Voltmeter. 5. Power meter. 6. Power factor meter. 7. Frequency meter. 8. Fuse. 9. Air switch. 10. Transfer switch. 11. Signal light. 12. Resistor. 13. Button. 14. Microcomputer integrated protection device, etc.
Secondary components, also known as secondary equipment or auxiliary equipment, refer to low-voltage equipment that monitors, controls, measures, adjusts and protects primary equipment.
