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KYN28-12 Armored Withdrawable AC Metal-Enclosed Switchgear from China Suppliers and Factory for Power Grids
Basic Product Overview
KYN28-12 high-voltage switchgear cabinet (labeled as — feeder cabinet) is 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 through grounded metal partitions:
▪ Circuit Breaker Compartment ▪ Busbar Compartment ▪ Cable Compartment ▪ Secondary Control Compartment
This compartmentalized design not only prevents fault expansion between compartments but also improves the safety of operation and maintenance. The cabinet 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).
Industrial Plants
Power distribution for high-power equipment (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
| Parameter | Specification / Value |
|---|---|
| ⚡ Rated Voltage | 12kV (adapted to 10kV power systems; maximum operating voltage: 12kV) |
| ⚡ Rated Frequency | 50Hz (matches the standard power grid frequency in most countries and regions) |
| ⚡ Rated Current — Main Circuit | 630A, 1000A, 1250A, 1600A (feeder scenarios typically use 630A / 1250A) |
| ⚡ Rated Current — Auxiliary Circuit | 220V / 380V (for powering control, protection, and monitoring components) |
| ⚡ Short-Time Withstand Current | ≥ 25kA (duration: 4s; withstands steady-state short-circuit current impact) |
| ⚡ Peak Withstand Current | ≥ 63kA (resists instantaneous peak current generated by short-circuit faults) |
| ⚡ Power Frequency Withstand Voltage | 42kV / 1 min (between live parts and ground; between different phases) |
| ⚡ Lightning Impulse Withstand Voltage | 75kV (protects against overvoltage caused by lightning strikes or switching operations) |
| ⚡ IP Protection Grade | IP4X standard (IP54 available for harsh environments) |
| ⚡ Operating Temperature | -10°C to +40°C (derating by 1% per 1°C above 40°C) |
| ⚡ Altitude | ≤ 1000m (derating required above 1000m) |
| ⚡ Humidity | Daily average ≤ 95%, monthly average ≤ 90% (no condensation) |
Detail Pictures
Frequently Asked Questions
Q1
What is the difference between KYN28-12 and KYN28A-12?
KYN28-12 and KYN28A-12 refer to the same product family. "KYN28A-12" is simply an updated or manufacturer-specific variant designation. Both share identical core specifications — 12kV rated voltage, withdrawable circuit breaker, and compartmentalized metal-enclosed structure — and comply with the same GB3906-2020 and IEC 62271-200 standards.
Q2
What rated current options are available for the KYN28-12 feeder cabinet?
The KYN28-12 main circuit supports multiple rated current specifications: 630A, 1000A, 1250A, and 1600A. For typical feeder applications, 630A and 1250A are the most commonly selected configurations. The auxiliary circuit operates at 220V or 380V for control and protection components.
Q3
Can the KYN28-12 be used in renewable energy (wind/solar) applications?
Yes. The KYN28-12 is suitable for renewable energy systems including wind and solar power generation. It can be customized with specialized protection functions (such as directional overcurrent, anti-islanding, and grid synchronization protection) to meet the specific requirements of connecting generation units to the utility grid.
Q4
What IP protection grade does the KYN28-12 cabinet offer, and can it be upgraded?
The standard KYN28-12 cabinet provides IP4X protection, which prevents solid objects larger than 1mm from entering and is suitable for indoor dry environments. For harsher operating conditions — such as high humidity, dusty industrial sites, or outdoor sheltered installations — an upgraded IP54 version can be customized upon request.
Q5
What are the altitude and temperature limitations for the KYN28-12?
The KYN28-12 is designed for altitudes up to 1000m under standard operating conditions. For installations above 1000m, derating of the equipment capacity is required. The operating temperature range is -10°C to +40°C; for every 1°C increase above 40°C, the rated current should be derated by approximately 1% to ensure reliable long-term operation.
Q6
What standards does the KYN28-12 comply with, and what certifications does it hold?
The KYN28-12 high-voltage switchgear cabinet complies with Chinese national standard GB3906-2020 (Metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV) and international standard IEC 62271-200. These standards ensure the cabinet meets rigorous requirements for insulation performance, short-circuit withstand capability, mechanical endurance, and operational safety in medium-voltage power distribution systems.