KYN28-12 Armored Withdrawable AC Metal-Enclosed Switchgear Power Grids

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.

  - 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

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).