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China KYN61-40.5 Armored Withdrawable AC Metal-Enclosed Switchgear - Reliable Suppliers and Factory Source
Basic Overview
This KYN61-40.5 type high-voltage switchgear is 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 in the image 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).
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
Rated Voltage
40.5kV
Adapted to 35kV power systems; max operating voltage 46kV
Rated Frequency
50Hz
Compatible with standard power grids in China and most regions
Rated Current
Main Circuit: 1250A
Optional: 630A, 1000A, 1600A, etc.
Auxiliary Circuit: 220V / 380V
Short-Time Withstand Current
≥ 25kA
Duration: 4s — withstands short-circuit impact within specified time
Peak Withstand Current
≥ 63kA
Resists instantaneous peak current generated by short circuits
Insulation Level
Power Frequency: 95kV (1 min)
Lightning Impulse: 185kV
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?
A The KYN61-40.5 is primarily used for receiving, distributing, and protecting high-voltage electrical energy in 35kV power distribution systems. It is widely deployed in power plants, substations, industrial and mining enterprises, and large commercial buildings as an incoming line cabinet.
Q What does the "1250A" marking on the cabinet indicate?
A The "1250A" marking indicates the rated current of the main circuit. This means the cabinet can support long-term continuous operation at 1250 amperes. Other optional specifications include 630A, 1000A, and 1600A depending on application requirements.
Q How does the compartmentalized structure improve safety?
A The metal-clad, compartmentalized structure separates key functional areas — including the circuit breaker compartment, busbar compartment, cable compartment, and secondary control compartment — using grounded metal partitions. This prevents fault propagation between compartments, significantly enhancing operational safety and complying with GB3906-2020 standards.
Q What is the insulation performance of the KYN61-40.5 cabinet?
A The cabinet features a power frequency withstand voltage of 95kV (sustained for 1 minute between live parts and ground, and between phases), and a lightning impulse withstand voltage of 185kV, providing reliable protection against overvoltage caused by lightning strikes or switching surges.
Q Is the KYN61-40.5 suitable for outdoor installation?
A No. The KYN61-40.5 carries an IP4X protection grade, which prevents solid objects of 1mm or larger from entering the enclosure. It is designed for indoor installation environments. For outdoor applications, a higher IP-rated enclosure or additional protective housing would be required.
Q What short-circuit protection capabilities does this switchgear offer?
A The KYN61-40.5 offers a rated short-time withstand current of ≥25kA for a duration of 4 seconds, and a rated peak withstand current of ≥63kA. These specifications ensure the cabinet can safely withstand and interrupt fault currents under short-circuit conditions without structural damage.