Medium Voltage Switchgear & Distribution Panels
The KYN28A-12 is a 12kV rated indoor metal-clad withdrawable switchgear, designed for three-phase AC 50Hz indoor complete power distribution equipment. It features an armored withdrawable construction and is primarily used in power plants, substations, industrial and mining enterprises, and high-rise buildings for receiving and distributing electrical energy, as well as controlling, protecting, and monitoring circuits. Compliant with GB, DL, and IEC standards, it incorporates a comprehensive "Five Prevention" interlocking function, making it a high-performance, safe, and reliable power distribution device.
Detailed Technical Specifications
Parameter Category | Technical Specifications |
Rated Characteristics | Rated Voltage: 12kV |
Insulation Level | 1min Power Frequency Withstand Voltage: Phase-to-Phase & Phase-to-Ground 42kV, Isolating Distance 48kV |
Short-circuit Characteristics | Rated Short-circuit Breaking Current: 20kA, 25kA, 31.5kA, 40kA |
Mechanical Characteristics | Protection Degree: Enclosure IP4X, Between compartments/Circuit Breaker Compartment door open IP2X |
Auxiliary Circuit | Rated Voltage: AC or DC 110V/220V |
Key Product Features
1.Excellent Structure and Materials
The enclosure is made of high-quality aluzinc steel plates, processed by CNC machines and using multiple bending processes, offering high precision, corrosion resistance, oxidation resistance, and high mechanical strength.
The armored withdrawable structure divides the cabinet into four separate compartments: circuit breaker compartment, busbar compartment, cable compartment, and relay & instrument compartment, isolated by metal partitions, with a high protection degree.
The withdrawable design facilitates easy inspection and maintenance of the movable truck.
2.Outstanding Electrical Performance and Safety
Can be equipped with high-performance vacuum circuit breakers such as VS1 (ZN63) or VD4 series, featuring strong breaking capacity and long service life.
Comprehensive "Five Prevention" interlocking functions effectively prevent misoperation and ensure the safety of equipment and personnel:
Prevent moving the breaker truck while energized
Prevent erroneous opening and closing of the circuit breaker
Prevent closing the circuit breaker when the earthing switch is in the closed position
Prevent access to live compartments
Prevent erroneous closing of the earthing switch when live
Pressure relief devices are installed above the circuit breaker compartment, busbar compartment, and cable compartment. In the event of an internal fault arc, they promptly release pressure and vent gases to ensure safety.
3.Flexibility and Expandability
Movable Truck Design: Depending on the application, it can be a circuit breaker truck, voltage transformer truck, metering truck, or isolation truck. Trucks of the same specification are interchangeable.
Busbar System: A single busbar system can be used, and derivatives like single busbar with bypass or double busbar structures are available to meet different main wiring requirements.
The cable compartment is spacious, allowing for the connection of multiple cables.
Supports overhead line connections, cable connections, and other functional schemes, enabling combination into various forms of power distribution assemblies.
4.Intelligent Monitoring and Control (Optional)
Can be equipped with microprocessor protection devices and intelligent measurement and control devices.
Can be fitted with electric operating mechanisms (e.g., electric truck chassis, electric earthing switch), supporting programmed operation and remote control.
Typical Applications
Power Plants: Medium and small generator power transmission, auxiliary power systems.
Substations: Receiving and feeding power in secondary substations of power systems.
Industrial and Mining Enterprises: Power distribution centers in large industrial and mining plants.
Large Buildings: Power distribution systems in high-rise buildings and commercial complexes.
Others: Starting and control of large high-voltage motors.
Optional Configurations
Standard Type: Configured with manual operating mechanism and basic protection functions.
Intelligent Type: Configured with electric operating mechanisms, intelligent measurement and control devices, communication interfaces, supporting remote monitoring and programmed operation.
High-Parameter Type: Rated current up to 4000A, rated short-circuit breaking current up to 40kA.
Special Environment Type: Can be designed for specific environmental requirements (must be specified when ordering).
Q1. What are the primary applications for the KYN28A-12 (GZS1) Switchgear?
A: The KYN28A-12 is a premier indoor metal-clad switchgear designed for 3.6kV to 12kV three-phase AC 50/60Hz power systems. It is the standard solution for power plants, substations, and high-energy industrial facilities (mining, metallurgy, and oil & gas) for power reception, distribution, and circuit protection.
Q2. What does "Armored" (Metal-Clad) construction mean for safety?
A: Our KYN28A-12 features an armored design, where the cabinet is divided into four independent compartments (Busbar, VCB/Handcart, Cable, and Low-Voltage). Each compartment is separated by grounded metal partitions and equipped with its own pressure relief flap on the top to safely vent gases in the event of an internal arc.
Q3. Which Vacuum Circuit Breakers (VCB) can be used with this system?
A: The KYN28A-12 is highly versatile. We typically equip it with the VD4 (ABB), EV12 (Schneider), or our high-performance domestic VS1 series. The center-mounted handcart design allows for effortless removal and replacement for maintenance.
Q4. How does the "Five-Prevention" mechanical interlocking system work?
A: Safety is our top priority. The KYN28A-12 features a strict Five-Prevention interlock:
1.Prevents closing the breaker when the handcart is in an unstable position.
2.Prevents moving the handcart when the breaker is closed.
3.Prevents closing the earthing switch when the handcart is in the "Service" position.
4.Prevents moving the handcart when the earthing switch is closed.
5.Prevents accidental entry into energized compartments through mechanical shutters.
Q5. What materials are used for the enclosure of the KYN28A-12?
A: The cabinet frame and partitions are constructed from Alu-Zinc coated steel plates (Galvalume). These plates are processed using high-precision CNC machinery at our factory in Shanxi to ensure a perfectly modular fit and superior resistance to corrosion and oxidation.
Q6. What are the standard Rated Voltage and Short-Circuit parameters?
A: Our standard KYN28A-12 supports a rated voltage of 12kV, a rated current up to 4000A, and a rated short-time withstand current (Icw) of 25kA, 31.5kA, or 40kA (for 4 seconds), ensuring high reliability under fault conditions.
Q7. How do you ensure the insulation quality for 12kV systems?
A: We utilize high-quality Epoxy Resin for insulation components like insulators, bushings, and contact boxes. For projects in high-altitude or humid environments, we offer enhanced creepage distance designs and composite insulation solutions to prevent flashovers.
Q8. Can this switchgear be integrated into a "Smart Grid"?
A: Absolutely. The low-voltage compartment can be fitted with Microcomputer Protection Relays and smart meters. These devices support IEC 61850 or Modbus-RTU protocols, allowing for full remote monitoring, automated fault detection, and integration into your SCADA system.
Q9. What Ingress Protection (IP) rating does the board provide?
A: The standard enclosure rating is IP4X when the door is closed. When the VCB compartment door is open (for testing or withdrawal), the protection remains at IP2X to protect maintenance personnel from accidental contact with live parts.
Q10. What documentation is provided for international shipping?
A: Every KYN28A-12 set from our Shanxi factory is shipped with a comprehensive technical package in English, including:
Single Line Diagrams (SLD) and wiring schematics.
Factory Acceptance Test (FAT) Reports.
Type Test Reports (Internal Arc, Temperature Rise, etc.).
Installation and Maintenance Manuals.
