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China KYN61-40.5 Armored Withdrawable AC Metal-Enclosed Switchgear - Reliable Suppliers and Factory 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 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
1. Rated Voltage
40.5kV (adapted to 35kV power systems, with a maximum operating voltage of 46kV).
2. Rated Frequency
50Hz (compatible with standard power grids in China and most regions).
3. Rated Current
Main circuit (marked "1250A"): 1250A (supports long-term operation; optional: 630A, 1000A, 1600A, etc.).
Auxiliary circuit: 220V/380V (for control, protection, and monitoring).
4. Rated Short-Time Withstand Current
≥25kA (duration: 4s; able to withstand short-circuit impact within the specified time).
5. Rated Peak Withstand Current
≥63kA (resists instantaneous peak current generated by short circuits).
6. Insulation Level
Power frequency withstand voltage (1min): 95kV (live parts to ground/phases).
Lightning impulse withstand voltage: 185kV (overvoltage protection).
7. IP Protection Grade
IP4X (prevents solid foreign objects ≥1mm from entering; suitable for indoor environments).
8. Operating Temperature
-10℃ to +40℃ (normal operation; derating required when exceeding this range).
Detail Pictures
Frequently Asked Questions
What is the primary application of the KYN61-40.5 switchgear?
It is a core electrical equipment widely applied in 35kV power distribution systems, designed for receiving, distributing, and protecting high-voltage electrical energy in power plants, substations, industrial enterprises, and large commercial buildings.
What safety standards and structural design does this switchgear use?
The cabinet complies with GB3906-2020 standards and features a metal-clad, compartmentalized structure. It separates functional areas (circuit breaker, busbar, cable, and secondary control compartments) with grounded metal partitions to prevent the spread of faults.
What are the key technical specifications of the incoming line cabinet?
It features a rated voltage of 40.5kV, a rated frequency of 50Hz, and a main circuit rated current of 1250A. Its rated short-time withstand current is ≥25kA (4s) and its peak withstand current is ≥63kA.
What is the protection rating (IP grade) and suitable operating environment?
It has an IP4X protection grade, which prevents solid foreign objects larger than 1mm from entering. The standard operating temperature range is -10℃ to +40℃ (indoor installation; derating is required if exceeded).
What insulation levels does the KYN61-40.5 switchgear support?
The switchgear supports a power frequency withstand voltage of 95kV (1 minute duration between live parts/ground/phases) and a lightning impulse withstand voltage of 185kV to protect against overvoltage.