KYN28-12 Medium Voltage Metal-clad Armored Removable Switchgear


KYN28A-12 is a medium voltage removable metal-clad switchgear designed for indoor power distribution systems. It operates at a three-phase 50Hz frequency with a rated voltage of 12kV and a maximum working current of up to 4000A. This switchgear is widely used in secondary substations of power plants, industrial and mining enterprises, power distribution systems, power transmission, high-voltage motor starters, and other applications for control, protection, and monitoring.

Reference Standard Document: C37.20.2-2022 – IEEE Standard for Metal-Clad Switchgear



KYN28-12 Medium Voltage Metal-Clad Armored Removable Switchgear

KYN28A-12, widely known as Indoor Metal Armored Removable Switchgear, is a commonly used high-voltage switchgear in China. It operates within a rated voltage range of 3.6kV to 12kV. What makes it unique is the central placement of the vacuum circuit breaker within the front cabinet of the switchgear. This design optimizes the lower space, enabling additional expansions or serving as a cable room.

Detailed Structure:

Constructed in compliance with the GB3906 and IEC298 standards for armored metal-enclosed switchgear, the cabinet is made from high-quality cold-rolled steel and aluminum deposited zinc plate. Precision CNC machining, high-precision laser cutting, and special molds ensure a double-sided process forming. The components are securely connected using high-strength bolts, nuts, rivet nuts, and steel rivets. The cabinet effectively separates the low-pressure chamber, circuit breaker chamber, bus room, and cable room units, each equipped with a separate pressure relief channel to ensure excellent relief and ventilation. The indoor cable set comprises a 10*60mm main ground bus.

Key Features:

  • Fully Assembled Cabinet: The switchgear comes with a compact, fully assembled cabinet that accommodates various domestic and international mainstream vacuum circuit breakers, voltage transformers, surge arresters, variable fuses, and isolation units. All handcart units offer the same functionality, ensuring interchangeability, easy operation, and replacement.
  • Five Anti’ Interlock: It features a simple and effective interlock mechanism to prevent misuse, enhancing safety during operation.
  • Versatile Compatibility: Compatible with a range of vacuum circuit breakers, including ZN63A (VS1), VD4, ZN21, 3A1-1, VB2, VEP vacuum circuit breakers, VC7 vacuum contactors, load switches, and disconnecting switches.
  • Modular Handcart System: The cabinet can accommodate voltage transformer handcart, metering handcart, isolating handcart, and station earthing handcart, all with the same functionality and interchangeability.
  • Easy Maintenance: The switchgear can be installed against a wall, enabling front-of-cabinet maintenance and reducing the required footprint.
  • Enhanced Protection: Separate heaters are provided for the circuit breaker room and cable room to prevent condensation and corrosion.
  • Spacious Cable Room: The cable room offers ample space and can accommodate multiple cables.
  • Reliable Protection: The switchgear is enclosed with a protection rating of IP4X, with each compartment boasting a protection level of IP2X.

In summary, KYN28A-12 Vacuum Circuit Breaker offers a highly efficient, flexible, and reliable solution for high-voltage applications, ensuring seamless operations and safeguarding critical electrical systems. With its advanced features and robust construction, this switchgear is well-suited for various indoor installations, making it a preferred choice in the industry.

Technical Parameters:

  • Rated Voltage: 12KV
  • Rated Frequency: 50Hz
  • Rated Current of Circuit Breaker: 630/1250/1600/2000/2500/3150A
  • Rated Current of Switch Cabinet: 630/1250/1600/2000/2500/3150A
  • Rated Current of Dynamic Stability (4S): 20/25/31.5/40KA
  • Rated Current of Dynamic Stability (Peak): 50/63/80/100KA
  • Rated Short Circuit Breaking Current: 20/25/31.5/40KA
  • Rated Short Circuit Making Current (Peak): 50/63/80/100KA
  • Rated Insulation Level:
    • 1-Minute Power Frequency Withstand Voltage: 25, 30, 42kA
    • Lightning Impulse Withstand Voltage: 40, 60, 75kA
  • Protection Degree: IP2X (IP4X when the compartment and circuit breaker room are open)

Cabinet Outline Dimensions (mm) (not including door):

  • Height: 2300
  • Width: 650 or 800 or 1000
  • Depth: 1500-1700

Working Conditions:

  • Altitude: Suitable for locations below 1000m above sea level.
  • Ambient Temperature: Operational temperature ranges from -10°C to +40°C, with a storage tolerance as low as -25°C.
  • Relative Humidity: Designed to operate under daily relative humidity of up to 95% on average and monthly relative humidity of up to 90% on average.
  • Seismic Resistance: Built to withstand seismic activity up to a scale of earthquake 8.
  • Contaminated Environment: Suitable for use in Category II contaminated environments.
  • Special Operation Conditions: If intended for use beyond the specified normal environmental conditions, consult with the manufacturer and provide appropriate details.

Ordering Instructions:

When ordering the switchgear, provide the following technical information:

  • Main Circuit Scheme Diagram.
  • Control, Measurement, and Protection Functions.
  • Main Electrical Components (model, specification, and quantity).
  • Bus Bridge Connection Requirements (rated current carrying capacity, span, and height).
  • Special Environmental Conditions.
  • Any Other Special Requirements.

By offering precise technical information during the ordering process, users can ensure that the switchgear is tailored to their specific operational requirements, guaranteeing reliable and efficient performance.


KYN28-12 Medium Voltage Metal-clad Armored Removable Switchgear插图1