Core Switching Components (Main Circuit Core)
- Vacuum circuit breaker: The core executive component, used to switch on and off the 10kV circuit. It can quickly cut off fault currents (such as short circuits and overloads) to ensure system safety.
- Isolating switch: Achieves circuit isolation during maintenance, forming a visible break point to prevent hazards from live working.
- Earthing switch: Discharges residual charges in the cabinet through earthing before equipment maintenance, ensuring the personal safety of maintenance personnel.
Protection and Measurement & Control Components (Safety Monitoring Core)
- Current transformer (CT): Converts high current into standard low current (e.g., 5A) to provide detection signals for protection devices and instruments.
- Voltage transformer (VT): Converts 10kV high voltage into standard low voltage (e.g., 100V) for voltage measurement and protection activation.
- Relay protection device: Real-time monitors circuit parameters. When faults such as overload, short circuit, or earthing occur, it triggers the circuit breaker to trip and avoids equipment damage.
- Intelligent measurement and control instrument: Displays data such as voltage, current, power, and electrical energy, supporting remote monitoring and data upload.
Auxiliary Electrical Components (Operation Guarantee)
- Fuse: Protects the secondary circuit or auxiliary circuit to prevent the expansion of small-current faults.
- Surge arrester: Suppresses lightning overvoltage or switching overvoltage, protecting the insulation of internal equipment from breakdown.
- Secondary circuit components: Including contactors, relays, terminal blocks, and cables, realizing control signal transmission and equipment interlocking.
- Earthing busbar and insulation parts: Ensures reliable cabinet earthing to prevent electric leakage. Insulation parts (such as insulators) isolate live parts to avoid short circuits.