Rated voltage: 12 kV
Rated frequency: 50 Hz (or 60 Hz)
Rated current:
Main bus: 630A, 800A, 1250A, 1600A, 2000A, 2500A, 3150A, 4000A (4000A and above require special design or capacity reduction).
Feeder/incoming line/bus tie circuit: 630A, 800A, 1250A, 1600A, 2000A, 2500A, 3150A.
Rated short-time withstand current (thermal stability current - Icw): 25kA, 31.5kA, 40kA (mainstream, 4s), some high-end products can reach 50kA.
Rated peak withstand current (dynamic stability current - Ipk): 63kA, 80kA, 100kA (mainstream, usually 2.5 times of Icw), high-end products can reach 125kA.
Rated short-circuit breaking current (Isc): 25kA, 31.5kA, 40kA (most common, depending on the circuit breaker), 50kA (high-performance circuit breaker).
Rated short-circuit closing current: equal to the rated peak withstand current (Ipk).
Rated insulation level:
1min power frequency withstand voltage (phase-to-phase, phase-to-ground): 42 kV
Lightning impulse withstand voltage (peak, phase-to-phase, phase-to-ground): 75 kV
Isolation break withstand voltage: usually higher than phase-to-ground (such as power frequency 48kV, impulse 85kV).
Protection level:
Casing: IP4X (standard, protection against >1mm solid foreign objects).
When the circuit breaker door is open: IP2X (protection against >12.5mm solid foreign objects).
Internal compartments: Metal partition isolation, high protection level.
Main circuit resistance: ≤ specified value (μΩ), such as ≤100 μΩ (1250A), according to current level and standard requirements.
Mechanical life:
Circuit breaker trolley: conventional 10,000 times, maintenance-free type can reach 30,000 - 50,000 times (such as with VD4/VEP, etc.).
Earthing switch: 2,000 times.
Dimensions (width x depth x height): The typical size of a standard single cabinet is about 800mm (or 1000mm) x 1500mm (1650mm, 1800mm) x 2200mm (2300mm). It is extremely compact and a model of space saving. The size is affected by the current, the way the lines are connected, and the manufacturer's design.
Excellent safety: Armored structure, independent compartment, automatic valve, forced five-protection interlock, directional pressure relief and other designs provide industry-leading personal and equipment safety protection levels.
High reliability: Mature design, strict process, extensive use of high-performance vacuum circuit breakers (such as VS1, ZN63 (VS1), VD4, VEP, i-AX, etc.), stable quality of key components, ensuring long-term trouble-free operation.
Unparalleled maintenance convenience: The center-mounted removable design is the biggest highlight. The circuit breaker is repaired or replaced outside the cabinet, without the need to disassemble the primary cable and busbar, and the replacement time can be shortened to less than 30 minutes, significantly improving power supply continuity.
Compact structure, space saving: Compared with the old fixed cabinet (such as XGN) and floor-standing trolley cabinet, the volume is greatly reduced, especially suitable for distribution rooms with limited space.
Modularity and flexibility:
Easy to combine into various main wiring schemes: incoming line cabinet, outgoing line cabinet, busbar cabinet, PT cabinet, metering cabinet, isolation cabinet, station transformer cabinet, capacitor cabinet, etc.
Support multiple incoming and outgoing line modes: cable in/out from below, cable in/out from below, busbar bridge in/out from above.
Various types of trolleys to meet different functional requirements.
Intelligent and digital interface: The low-voltage room has ample space and is easy to integrate:
Powerful microcomputer integrated protection and control device.
Intelligent control device (integrated display, control, status indication, temperature and humidity control, etc.). <
Online monitoring device (circuit breaker mechanical characteristics, temperature, partial discharge, etc.).
Communication management unit, supports IEC 61850, Modbus and other protocols, and is connected to SCADA/DCS system.
Good environmental adaptability: The standard design meets the indoor environment (temperature: -5°C ~ +40°C, humidity: ≤90%, altitude ≤ 1000m). Higher altitudes or special environments (condensation, dirt, salt spray) require special treatment or capacity reduction.
Industrial and mining enterprises: high-voltage incoming lines, feeders, motor control and protection of main distribution stations and workshop substations.
Commercial buildings: main distribution stations of large commercial complexes, office buildings, hotels, hospitals, airports, and data centers.
Infrastructure: power distribution systems of rail transit, tunnels, ports, and water treatment plants.
New energy: grid-connected/distribution switchgear for photovoltaic power stations, wind farms (high-voltage side of box-type transformers or collector lines), and energy storage power stations.
Public utilities: upper power incoming line cabinets of switch stations (switch stations) and ring network cabinets.
Power plants: plant power systems.
