Armored Removable Type High Voltage Electrical Switchgear Power Distribution Equipment

The KYN28A-12 (GZW-12) Series is the premier indoor armored metal-clad switchgear designed for three-phase AC 50/60Hz power systems. Rated for voltages up to 12kV, this equipment is the core protection and control unit for power plants, industrial substations, and commercial infrastructure.

The KYN28A-12 features a central-mounted withdrawable vacuum circuit breaker (VCB), which provides superior mechanical stability and ease of maintenance. Engineered for "Primary Distribution," it utilizes a modular design that allows for the integration of various high-performance breakers, including ABB’s VD4, Schneider’s EV12s, or our proprietary VS1 series.

This device is an indoor metal armored extractable switchgear (hereinafter referred to as switchgear). It is a complete power distribution device of 3.6-12 kV three-phase AC 50Hz single bus and single bus segmented system, mainly used in power plants. Small AND medium-sized generators, power distribution of industrial and mining enterprises, as well as the secondary substation of the electric system, power receiving, power transmission and large high voltage motor starting. For the purpose of control protection and monitoring, the switch equipment meets IEC298, GB3906 and other standard requirements. It has the interlocking function of preventing the push-pull circuit breaker hand car with load, preventing the mistake of splitting and closing the circuit breaker, preventing the grounding switch from closing the circuit breaker when the grounding switch is in the closed position, preventing it from entering the live chamber, and preventing the mistake of closing the grounding switch when the power is live. It can be equipped with VS1 vacuum circuit breaker, and it is a kind of performance distribution device.

• Armored Metal-Clad Integrity: Constructed from high-precision CNC-machined Aluminum-Zinc (Al-Zn) coated steel sheets. The multi-bend process ensures extreme mechanical strength and corrosion resistance without the need for additional surface painting.

• Withdrawable Center-Mounted Design: The VCB is mounted on a handcart at the mid-section of the cabinet. This design allows for easier maintenance of the breaker and cable compartment compared to bottom-mounted units.

• LSC2B Service Continuity: Rated as LSC2B (Loss of Service Continuity), meaning individual compartments (Busbar, VCB, Cable) are separated by grounded metal partitions, allowing maintenance in one compartment while others remain energized.

• Strict "Five-Prevention" Interlocks: A comprehensive mechanical and electrical interlocking system prevents errors like:

  • Moving the circuit breaker while closed.

  • Closing the breaker in the "Test" or "Service" position without the grounding switch being open.

  • Entering the cable compartment while parts are energized.

• Arc-Flash Safety: Every compartment is equipped with an independent pressure relief vent on the top to exhaust high-pressure gases in the event of an internal arc fault, protecting operators in the front of the cabinet.

1. Normal conditions
a. Ambient air temperature: upper limit, +40℃ lower limit, -10℃
b. Altitude: 1000M
c. Relative ambient humidity: the average daily relative humidity is no more than 95%, and the average monthly relative humidity is no more than 90%;
d. Earthquake: intensity does not exceed 8 degrees.
e, the surrounding air should be free from corrosive or combustible gases, water vapor and other obvious pollution.
f. No serious pollution and frequent violent vibration, and the severity design meets the requirements of class 1 under harsh conditions.
2. Special working conditions: * When it is used under the normal environmental conditions stipulated in GB3906, it shall be negotiated by the user and the manufacturer.

1. Utility Substations: Primary control and protection for 11kV urban and rural power grids.

2. Heavy Industry: Reliable power management for steel mills, petrochemical plants, and mining operations.

3. Infrastructure Hubs: Essential power distribution for airports, data centers, and metropolitan rail transit.

4. Power Generation: Main switchgear for thermal, hydro, and large-scale solar/wind power station auxiliary systems.

• Turnkey Customization: We offer bespoke internal configurations, including tailored protection relay settings (SEL, Siemens, or Schneider) and specific CT/PT ratios based on your SLD.

• Smart Grid Ready: Can be equipped with smart sensing technology for real-time monitoring of busbar temperature, VCB mechanical life, and environmental humidity via RS485/IEC 61850.

• Global Logistics Support: Our equipment is packed in sea-worthy wooden crates and has been successfully deployed in over 30 countries across Southeast Asia, the Middle East, and Africa.

• Full Routine Testing: Every cabinet undergoes rigorous factory acceptance tests (FAT), including power frequency withstand and mechanical sequence tests, ensuring zero-defect arrival.

Q: Can I use this for an 11kV system?

A: Yes. The 12kV rating provides a standard safety margin for all 10kV and 11kV electrical systems.

Q: What is the typical width of the cabinet?

A: For currents up to 1250A, the standard width is 800mm. For 1600A to 3150A, the width increases to 1000mm to accommodate larger busbars and better thermal dissipation.

Q: Does it support remote operation?

A: Absolutely. We can install motorized VCB trucks and grounding switches, allowing for full remote switching and isolation from your central control room (SCADA).