Medium Voltage Switchgear & Distribution Panels
The KYN28-24 is a 24kV rated indoor metal-clad withdrawable switchgear, designed for three-phase AC 50Hz power distribution systems. It features a 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 and IEC standards, it supports various vacuum circuit breaker models and 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: 24kV |
Insulation Level | 1min Power Frequency Withstand Voltage: Phase-to-Phase & Phase-to-Ground 65kV, Isolating Distance 79kV |
Short-circuit Characteristics | Rated Short-circuit Breaking Current: 25kA, 31.5kA, 40kA |
Mechanical Characteristics | Protection Degree: Enclosure IP4X, Circuit Breaker Compartment door open or between compartments 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 (enclosure IP4X).
The withdrawable design makes the movable truck compact, facilitating easy inspection and maintenance.
2.Outstanding Electrical Performance and Safety
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: The truck chassis is assembled from thin steel plates. 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 100% 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 (1-3 single-core cables per phase, up to 6 if necessary).
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 online temperature monitoring technology, voltage presence indicators, etc., for real-time monitoring of equipment operating status.
Can be fitted with electric operating mechanisms (e.g., electric truck chassis, electric earthing switch), supporting programmed operation and remote control, providing the foundation for distribution automation.
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, online monitoring (e.g., temperature measurement), 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 KYN28-24(Z) Switchgear?
A: The KYN28-24 is an armored, metal-enclosed switchgear designed for 24kV AC 50/60Hz power systems. It is widely used in power distribution centers for receiving and distributing energy, as well as controlling, protecting, and monitoring circuits in industrial and mining enterprises, hotels, and municipal infrastructure.
Q2. What does the "Armored" (Metal-Clad) design signify?
A: "Armored" means the internal components—such as the Busbar compartment, VCB (Vacuum Circuit Breaker) compartment, Cable compartment, and Low-voltage instrument room—are separated by grounded metal partitions. This design ensures that a fault in one compartment does not affect the others, providing maximum safety for operators.
Q3. Which Vacuum Circuit Breakers (VCB) are compatible with this unit?
A: Our KYN28-24 units are designed to house high-performance withdrawable VCBs. We typically install the VD4 (ABB), SION (Siemens), or our high-quality domestic VS1 series. The handcart design allows for easy maintenance and rapid replacement of the breaker.
Q4. What is the standard Ingress Protection (IP) rating?
A: The enclosure is rated at IP4X when the door is closed, preventing the entry of tools or wires larger than 1.0mm. When the VCB compartment door is open (during handcart withdrawal), the internal protection remains at IP2X to ensure maintenance safety.
Q5. How does the "Five-Prevention" mechanical interlocking system work?
A: Safety is our top priority. The KYN28-24 features a strict Five-Prevention interlock:
1.Prevents closing the breaker when the handcart is in an intermediate position.
2.Prevents moving the handcart when the breaker is closed.
3.Prevents closing the earthing switch when the handcart is in the test/service position.
4.Prevents moving the handcart when the earthing switch is closed.
5.Prevents accidental entry into energized compartments.
Q6. What materials are used for the cabinet structure?
A: We use high-quality Alu-Zinc coated steel plates (Galvalume), which are processed by high-precision CNC machinery in our Shanxi factory. These plates offer superior corrosion resistance and high mechanical strength compared to standard painted steel.
Q7. What are the Rated Voltage and Short-Circuit parameters for the 24kV model?
A: Our standard KYN28-24 supports a rated voltage of 24kV, a rated current up to 3150A, and a rated short-time withstand current (Icw) of 25kA or 31.5kA for 4 seconds. These specs make it suitable for heavy-duty grid applications.
Q8. How is heat dissipation managed in high-current units?
For units rated above 2000A, we implement forced-air cooling with intelligent temperature-controlled fans. We also use high-conductivity T2 copper busbars with silver plating at all contact points to minimize contact resistance and heat buildup.
Q9. Can the switchgear be integrated into a smart substation?
A: Yes. We can equip the low-voltage compartment with Intelligent Microcomputer Protection Relays and digital meters. These support communication protocols like IEC 61850 or Modbus-RTU, enabling real-time remote monitoring and control via SCADA.
Q10. What testing and documentation do you provide for international export?
A: Every KYN28-24 unit undergoes a comprehensive Factory Acceptance Test (FAT), including power-frequency withstand voltage tests, mechanical operation tests, and secondary circuit logic checks. We provide full English technical files, including Single Line Diagrams (SLD), GA drawings, and Test Reports.
