KYN61-40.5□ armored withdrawable AC metal-enclosed switchgear

KYN61-40.5□ armored withdrawable AC metal-enclosed switchgear is equipped with fully insulated ZN85-40.5, VD4 or VB2 vacuum circuit breakers and spring operating mechanisms. The cabinet is assembled from aluminum-zinc-coated steel sheets to improve the fit between the withdrawable truck and the cabinet. The truck moves smoothly in and out and offers strong interchangeability. The equipment has an attractive appearance, a complete range of circuit arrangements, and safe, reliable operation.

For 35kV, three-phase AC 50Hz power systems, this equipment receives and distributes electrical power in distribution rooms of power plants, substations and industrial or mining facilities, with control, protection and monitoring functions.

This product complies with: GB3906 "3-35kV AC metal-enclosed switchgear"; GB/T11022 "Common technical requirements for high-voltage switchgear and controlgear standards"; DL/T404 "Technical requirements for ordering AC high-voltage switchgear"; IEC298 "AC metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to and including 52kV".

Ambient air temperature: -15°C to +40°C.

Altitude: no more than 2500m.

Humidity conditions: daily average ≤95%, with daily average water-vapor pressure ≤2.2kPa; monthly average ≤90%, with monthly average water-vapor pressure ≤1.8kPa.

Seismic intensity: No more than 8 degrees.

There are no clearly contaminated sites such as corrosive or flammable gases.

Note: Users may consult with the company if the normal conditions of use mentioned above are exceeded.

1. Technical parameters of KYN61-40.5□ switchgear

2. Technical parameters of the ZN85-40.5 circuit breaker with integral spring operating mechanism

The product is divided into cabinets and handcars. The cabinet is made of steel plate bends, which are then assembled with bolts. By functional characteristics, it can be divided into four parts, small lead room, relay instrumentation room, handcar room, cable room and main room, separated by the metal partition of the site. The shell protection level is IP4X; the protection level is IP2X when the door of the car is open.

Main-circuit arrangements include cable or overhead incoming/outgoing connections, bus couplers, isolation, voltage transformers and surge arresters. The busbars use composite insulation. Flame-retardant injection-molded insulating sleeves protect phase-to-phase connections and joints. Busbar bushings separate adjacent cabinets, helping prevent fault propagation and supporting the main busbars. The cable compartment contains an earthing switch and overvoltage protection devices.

Metal shutters are fitted in front of the contact boxes. The upper and lower shutters open automatically as the truck moves from the disconnected/test position to the service position, and close when it moves back, isolating the high-voltage parts. Positive mechanical interlocks between the main switch, truck, earthing switch and cabinet door provide the five required protections against incorrect operation.

The circuit-breaker truck uses a lead-screw racking mechanism and an overrunning clutch. The screw-and-nut mechanism moves the truck easily between test and service positions. Its self-locking action holds the truck securely in the service position, preventing movement caused by electrodynamic forces. At the test and service positions, the overrunning clutch disengages the operating shaft from the screw shaft so it can turn freely, protecting the racking mechanism from incorrect operation. Other trucks use lever-operated racking mechanisms. Locating pins secure the test and service positions. Cabinet dimensions, width × depth × height (mm): 1400 × 2800 (3000) × 2600.