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China KYN28-12 Armored Withdrawable AC Metal-Enclosed Switchgear Suppliers & Factory for Power Distribution
Basic Product Overview
KYN28-12 high-voltage switchgear cabinet (labeled as —feeder cabinet), a mainstream indoor metal-clad switchgear widely used in 10kV power distribution systems. As a core device in medium-voltage power grids, it undertakes the tasks of power receiving, distribution, fault protection, and operational monitoring, and is widely applied in substations, industrial and mining enterprises, commercial buildings, and urban power distribution networks.
The KYN28-12 cabinet (also known as "KYN28A-12") adopts a withdrawable, compartmentalized metal-enclosed structure (complying with GB3906-2020 and IEC 62271-200 standards). Its design separates the cabinet into independent functional compartments (circuit breaker compartment, busbar compartment, cable compartment, secondary control compartment) through grounded metal partitions, which not only prevents fault expansion between compartments but also improves the safety of operation and maintenance. The cabinet in the image is a "feeder cabinet" (responsible for distributing power from the main busbar to downstream equipment or lines), marked with the model "KYN28-12" (applicable to 12kV systems) on the top panel.
Application Scenarios
- The secondary circuit uses plug-in connectors, simplifying wiring and maintenance.
As a feeder cabinet, the KYN28-12 is mainly used to distribute power from the main busbar to downstream loads (e.g., transformers, motors, or other distribution cabinets). Typical application scenarios include:
Industrial Plants
Power distribution for high-power equipment (e.g., pumps, fans, production lines) in steel, chemical, and manufacturing industries.
Commercial Buildings
Power supply for lighting, air conditioning, and elevators in shopping malls, office buildings, and hospitals.
Urban Substations
10kV distribution network outgoing lines, connecting to residential area transformers.
Renewable Energy Systems
Connecting wind/solar power generation units to the grid (with customized protection functions).
In summary, the KYN28-12 feeder cabinet is a mature, reliable 10kV high-voltage switchgear with standardized parameters, safe compartmentalized design, and comprehensive protection functions. It balances operational safety, maintenance convenience, and system stability, making it one of the most widely used medium-voltage switchgear in the current power distribution industry
Core Technical Parameters
1. Rated Voltage
12kV (adapted to 10kV power systems; maximum operating voltage: 12kV).
2. Rated Frequency
50Hz (matches the standard power grid frequency in most countries and regions).
3. Rated Current
- Main circuit: Common specifications include 630A, 1000A, 1250A, 1600A (the cabinet in the image typically uses 630A/1250A for feeder scenarios).
- Auxiliary circuit: 220V/380V (for powering control, protection, and monitoring components).
4. Short-Circuit Withstand Capability
- Rated short-time withstand current: ≥25kA (duration: 4s; withstands steady-state short-circuit current impact).
- Rated peak withstand current: ≥63kA (resists instantaneous peak current generated by short-circuit faults).
5. Insulation Level
- Power frequency withstand voltage (1min): 42kV (between live parts and ground; between different phases).
- Lightning impulse withstand voltage: 75kV (protects against overvoltage caused by lightning strikes or switching operations).
6. IP Protection Grade
IP4X (prevents solid objects ≥1mm from entering; suitable for indoor dry environments; IP54 can be customized for harsh environments).
7. Operating Conditions
- Temperature: -10℃ to +40℃ (normal operation; derating by 1% for every 1℃ increase above 40℃).
- Altitude: ≤1000m (derating required for use above 1000m).
- Humidity: Daily average ≤95%, monthly average ≤90% (no condensation).
Detail Pictures
Frequently Asked Questions (FAQ)
Q
What are the primary functions of the KYN28-12 feeder cabinet?
As a core medium-voltage switchgear device, the KYN28-12 feeder cabinet is primarily utilized to distribute electrical power from the main busbar to downstream equipment or branch lines (such as transformers and motors) while providing essential fault protection, power receiving, and operational monitoring.
Q
Which international standards does the KYN28-12 switchgear comply with?
The KYN28-12 (KYN28A-12) cabinet adopts a withdrawable, compartmentalized metal-enclosed structure that fully complies with GB3906-2020 and IEC 62271-200 international standards.
Q
What are the standard rated current specifications for the main and auxiliary circuits?
The main circuit commonly offers rated current options of 630A, 1000A, 1250A, and 1600A (typically 630A/1250A for feeder scenarios). The auxiliary circuit operates at 220V/380V for powering secondary protection, control, and monitoring components.
Q
What is the standard IP protection rating, and can it be upgraded?
The standard enclosure protection grade is IP4X, which prevents solid foreign objects larger than or equal to 1mm from entering (ideal for indoor environments). For harsh or demanding environments, IP54 protection can be customized.
Q
What are the standard ambient operating conditions for KYN28-12?
It operates under ambient temperatures between -10℃ and +40℃ (derated by 1% per 1℃ above 40℃), altitudes ≤1000m (derating required above 1000m), and relative humidity with daily average ≤95% and monthly average ≤90% (without condensation).
Q
How does the compartmentalized design improve operational safety?
The cabinet is segregated into independent compartments (circuit breaker, busbar, cable, and secondary control compartments) via grounded metal partitions. This structure effectively prevents electrical faults from spreading across compartments and ensures higher operator safety during maintenance.