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KYN61-40.5 Armored Withdrawable AC Metal-Enclosed Switchgear - China Suppliers and Factory for High Voltage Solutions
Basic Overview
This KYN61-40.5 type high-voltage switchgear, a core electrical equipment widely applied in 35kV power distribution systems. It's designed for receiving, distributing, and protecting high-voltage electrical energy, typically used in power plants, substations, industrial and mining enterprises, and large-scale commercial buildings.
The KYN61-40.5 cabinet adopts a metal-clad, compartmentalized structure (complying with GB3906-2020 standards), which separates functional areas — such as the circuit breaker compartment, busbar compartment, cable compartment, and secondary control compartment — with grounded metal partitions. This design effectively prevents the spread of faults between compartments and enhances operational safety.
The cabinet shown is an "incoming line cabinet" (responsible for connecting the external power supply to the distribution system), marked with ANN1 (cabinet number) and 1250A (rated current of the main circuit).
The cabinet shown is an "incoming line cabinet" (responsible for connecting the external power supply to the distribution system), marked with ANN1 (cabinet number) and 1250A (rated current of the main circuit).
Application Scenarios
As an incoming line cabinet, it's the "entry point" of the 35kV power distribution system: it connects the power supply (e.g., from a substation) to the busbar, distributes power to outgoing line cabinets, and provides protection for the entire system. It's suitable for:
- Medium and large-scale industrial plants (e.g., steel mills, chemical plants) that require stable high-voltage power supply.
- Urban substations (as part of the 35kV/10kV transformation system).
- Large commercial complexes (to meet the high-power electricity demand of multiple equipment).
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In summary, the KYN61-40.5 (1250A) incoming line cabinet is a high-reliability, safe high-voltage switchgear with standardized parameters and a modular structure. It balances operational convenience and fault protection, making it a key device in modern 35kV power distribution networks.
Technical Parameters
| Parameter | Specification |
|---|---|
| Rated Voltage | 40.5kV Max 46kV — adapted to 35kV power systems |
| Rated Frequency | 50Hz — compatible with standard power grids in China and most regions |
| Rated Current (Main Circuit) | 1250A — supports long-term operation; optional: 630A, 1000A, 1600A, etc. |
| Auxiliary Circuit | 220V / 380V — for control, protection, and monitoring components |
| Rated Short-Time Withstand Current | ≥ 25kA Duration: 4s — withstands short-circuit impact within specified time |
| Rated Peak Withstand Current | ≥ 63kA — resists instantaneous peak current generated by short circuits |
| Power Frequency Withstand Voltage | 95kV (1 min) — between live parts and ground; between different phases |
| Lightning Impulse Withstand Voltage | 185kV — protects against overvoltage caused by lightning strikes |
| IP Protection Grade | IP4X — prevents solid foreign objects ≥1mm from entering; suitable for indoor installation |
| Operating Temperature | -10°C to +40°C — normal operation; derating required when exceeding this range |
Detail Pictures
Frequently Asked Questions
Q
What is the KYN61-40.5 high-voltage switchgear primarily used for?
The KYN61-40.5 is primarily used for receiving, distributing, and protecting high-voltage electrical energy in 35kV power distribution systems. It is commonly installed in power plants, substations, industrial and mining enterprises, and large-scale commercial buildings as an incoming line cabinet.
Q
What does the "metal-clad, compartmentalized structure" mean in the KYN61-40.5 cabinet?
It means the cabinet's functional areas — including the circuit breaker compartment, busbar compartment, cable compartment, and secondary control compartment — are separated by grounded metal partitions. This structure complies with GB3906-2020 standards and prevents fault propagation between compartments, significantly improving operational safety.
Q
What is the rated current of the KYN61-40.5 main circuit, and are other options available?
The standard rated current for the main circuit is 1250A, which supports long-term continuous operation. Other available specifications include 630A, 1000A, and 1600A, allowing the cabinet to be configured according to different project requirements.
Q
What is the insulation level of the KYN61-40.5 switchgear?
The KYN61-40.5 features a power frequency withstand voltage of 95kV (1 minute, between live parts and ground or between phases) and a lightning impulse withstand voltage of 185kV, providing robust protection against overvoltage caused by lightning strikes and switching surges.
Q
What are the operating environment requirements for the KYN61-40.5 cabinet?
The cabinet is designed for indoor installation environments with an IP4X protection grade, preventing solid foreign objects ≥1mm from entering. The normal operating temperature range is -10°C to +40°C. If the ambient temperature exceeds this range, derating measures must be applied to ensure safe and stable operation.
Q
How does the KYN61-40.5 handle short-circuit fault conditions?
The KYN61-40.5 is designed to withstand a rated short-time withstand current of ≥25kA for 4 seconds and a rated peak withstand current of ≥63kA. This ensures the cabinet can safely endure the thermal and mechanical stresses produced during short-circuit events without structural damage or hazard to personnel.