Rated voltage: 40.5 kV
Rated frequency: 50 Hz
Rated current:
Main bus: Usually 1250A, 1600A, 2000A, 2500A, 3150A, etc.
Feeder/incoming line/bus tie circuit: Select according to demand, commonly used 630A, 800A, 1250A, 1600A, 2000A, 2500A, 3150A, etc.
Rated short-time withstand current (thermal stability current - Icw): Usually 25kA, 31.5kA, 40kA (4s), etc.
Rated peak withstand current (dynamic stability current - Ipk): usually 63kA, 80kA, 100kA, etc. (generally 2.5 times of Icw).
Rated short-circuit breaking current (Isc): usually 25kA, 31.5kA, 40kA, etc. (consistent with the equipped circuit breaker).
Rated short-circuit closing current: usually equal to the rated peak withstand current (Ipk).
Rated insulation level:
1min power frequency withstand voltage (phase-to-phase, phase-to-ground): 95 kV
Lightning impulse withstand voltage (peak, phase-to-phase, phase-to-ground): 185 kV
Isolation break withstand voltage: usually higher than the relative ground level (such as power frequency 110kV, impulse 215kV).
Protection level:
Casing: IP4X (prevents solid foreign objects with a diameter greater than 1mm from entering).
When the circuit breaker room door is open: IP2X.
Between internal compartments: usually with metal partitions to ensure a certain degree of isolation.
Main circuit resistance: ≤ specified value (μΩ), the specific value depends on the circuit configuration and current level.
Mechanical life: Circuit breaker trolley: usually 10,000 times; grounding switch: usually 2,000 times; isolating switch (if any): usually 2,000 times.
Dimensions (width x depth x height): Typical dimensions are about 1200mm x 1800mm x 2600mm (single cabinet), but there are large differences between different manufacturers and configurations.

High safety: Armored structure, compartment division, valve, perfect five-protection interlock, pressure relief channel and other designs to ensure personal and equipment safety to the greatest extent.

High reliability: Mature design, strict manufacturing process, reliable components (usually high-quality vacuum circuit breakers such as VS1, ZN85, etc.) to ensure long-term stable operation.

Maintenance convenience: The removable design is the biggest advantage. When the circuit breaker or other components fail, the faulty trolley can be quickly pulled out and replaced with a spare trolley to restore power supply. Maintenance work can be carried out outside the cabinet, greatly shortening the power outage time.

Good interchangeability: Trolleys of the same model and specification are interchangeable, which is convenient for spare parts management and quick replacement.

Flexibility: Different solutions can be configured according to user needs (such as incoming lines, outgoing lines, metering, busbars, PTs, station transformers, etc.), and there are various types of trolleys (circuit breakers, PTs, isolation, metering, fuses, etc.).

Modular design: easy to expand and combine into different power distribution systems.

Good operation monitoring: the relay instrument room can be installed with various protection, measurement, control and signal devices.

Strong environmental adaptability: the design can meet certain environmental temperature and humidity requirements (see technical conditions for details).