KYN61-40.5 Armoured Removable AC Metal-Enclosed Switchgear
KYN61-40.5 armored removable AC metal-enclosed switchgear is a high-voltage metal-clad withdrawable switchgear designed for 40.5kV three-phase AC 50Hz power systems. The main feature is that the cabinet is equipped with ZN85-40.5 fully insulated vacuum circuit breaker and spring operating mechanism. The cabinet body is composed of steel spray-plastic assembly, improving the coordination accuracy of the hand-car and the cabinet body — the hand-car is very light to push and pull out with strong interchangeability.
The switchgear adopts a metal-clad, compartmentalized structure with independent busbar, circuit breaker, cable, and low-voltage compartments, each separated by grounded metal partitions. This design ensures maximum operational safety and prevents fault propagation between compartments in accordance with IEC 62271-200 internal arc classification standards (IAC AFLR up to 31.5kA 1s).
Technical Specifications
| Item | Specification |
|---|---|
| Rated Voltage | 40.5kV |
| Rated Insulation Voltage | 40.5kV |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current (Main Busbar) | 630A / 1250A / 1600A / 2000A / 2500A / 3150A |
| Rated Short-time Withstand Current (Icw) | 25kA / 31.5kA (4s) |
| Rated Peak Withstand Current (Ipk) | 63kA / 80kA |
| Degree of Protection | IP4X (enclosure) / IP2X (partition) |
| Internal Arc Classification | IAC AFLR up to 31.5kA 1s |
| Circuit Breaker Type | ZN85-40.5 fully insulated vacuum circuit breaker |
| Operating Mechanism | Spring-operated mechanism (manual or motor-charged) |
| Electrical Endurance | ≥ 10,000 operations (mechanical) / ≥ 50 times rated short-circuit breaking |
| Busbar Material | High-conductivity electrolytic copper (T2 grade) |
| Enclosure Material | Steel plate with electrostatic spray-powder coating |
| Hand-car Type | Withdrawable, 3-position (Connected / Test / Disconnected) |
| Standards | IEC 62271-200, GB 3906 |
Key Features
- ZN85-40.5 Fully Insulated Vacuum Circuit Breaker: Integrates vacuum interrupter and spring operating mechanism in a compact, maintenance-friendly design with superior arc extinction capability and high electrical endurance
- Precision Hand-Car Mechanism: High-accuracy guide rails ensure smooth push-pull operation with minimal effort; all hand-cars of the same specification are fully interchangeable, significantly simplifying spare parts management and maintenance procedures
- Steel Spray-Plastic Cabinet Body: Heavy-duty steel plate with electrostatic spray-powder coating provides excellent corrosion resistance and mechanical strength for long-term outdoor or indoor service
- Metal-Clad Compartmentalization: Independent busbar, circuit breaker, cable, and low-voltage compartments with grounded metal partitions, preventing internal arc fault propagation and ensuring operator safety
- Comprehensive Interlocking System: Mechanical and electrical interlocks prevent incorrect operations — including preventing breaker withdrawal when in closed position, and preventing breaker closure when hand-car is in intermediate position
- Arc-Resistant Design: Type-tested to IEC 62271-200 internal arc classification AFLR up to 31.5kA 1s, with pressure-relief flaps directing arc gases to safe exhaust areas
- Flexible Configuration: Supports single bus, single bus with bypass, and double bus systems; wide range of standard schemes for incoming, outgoing, metering, PT, and bus-riser applications
Applications
- Thermal and hydro power plants — high-voltage auxiliary power distribution and generator outlet
- 35kV substations — power receiving, distribution, and control
- Wind farm and solar PV power plants — renewable energy collection and step-up substations
- Industrial enterprises — large motor control and process power supply
- Mining and metallurgy — high-voltage power distribution in harsh environments
- Urban power grid — 35kV distribution and transformation