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22KV Medium Voltage Metal Clad Switchgear
Cotenele has been committed to technological research and development in the field of medium voltage switchgear and ring main unit products for many years, covering a full range of switchgear panels with rated voltages from 3.6kV to 40.5kV.The KYN28-24 series 22KV Medium Voltage Metal Clad Switchgear we manufactured has advanced technology, is safe and reliable, has a reasonable structure, stable performance, and is easy to use. It is widely used in power plants, substations, industrial and mining enterprises, and commercial buildings.
Cotenele is one of the most advanced Medium-voltage switchgears manufacturers in China,The KYN28-24 Serie 22KV Medium Voltage Metal Clad Switchgear we manufacture has been running steadily in multiple projects of China State Grid for many years.The KYN28-24 medium-voltage switchgear is suitable for indoor three-phase 50/60Hz, rated voltage 24kV power systems,used for receiving and distributing electrical energy and controlling, protecting, and monitoring circuits.Our medium-voltage switchgear and ring main unit meet multiple domestic and international standards, such as GB/T3906 "3.6kV~40.5kV AC Metal Enclosed Switchgear and Control Equipment" and IEC 62271-200.
Model and meanings
Main technical parameters
1.Main technical parameters of the switchgear
| SN | Item | Unit | Parameters | ||||
| 1 | Rated voltage | KV | 24 | ||||
| 2 | Rated frequency | Hz | 50/60 | ||||
| 3 | Rated insulated level | Lightning impulse withstand voltage(peak value) | KV |
Phase to phase Phase to ground |
60 | Isolation Gap | 79 |
| 1-minute power frequency withstand voltage(effective value) | 125 | 145 | |||||
| Auxiliary control circuit power frequency withstand voltage | V | 2000 | |||||
| 4 | Rated current | A | 630,1250,1600,2000,2500,3150 | ||||
| 5 | Rated short circuit breaking current | KA | 20 | 31.5 | |||
| 6 | Rated short-circuit closing current(peak) | KA | 50 | 80 | |||
| 7 | Rated short-time withstand current(4s) | KA | 20 | 31.5 | |||
| 8 | Rated peak withstand current | KA | 50 | 80 | |||
| 9 | Rated voltage of auxiliary control circuit | V | DC or AC 110/220 | ||||
| 10 | Protection grade | IP4X(circuit breaker room door open or compartment to compartment IP2X) | |||||
| 11 | Dimensions of Shell(Width *Depth * Height) | mm | 800×1810×2380 | 1000×1810×2380 | |||
| 12 | Weight | Kg | 840~1440 | ||||
| Note:The depth of the overhead incoming and outgoing line cabinet is 2360mm. | |||||||
2. Main technical parameters of the VS1-24,VN2-24 vacuum circuit breaker
| SN | Item | Unit | Parameters | ||
| 1 | Rated voltage | KV | 24 | ||
| 2 | Rated insulated level | 1-minute power frequency withstand voltage(effective value) | 60 | ||
| Lightning impulse withstand voltage(peak value) | 125 | ||||
| 3 | Rated frequency | Hz | 50/60 | ||
| 4 | Rated current | A | 630,1250,1600,2000 | 630,1250,1600,2000,2500,3150 | |
| 5 | Rated short circuit breaking current | KA | 20 | 31.5 | |
| 6 | Rated short-circuit closing current(peak) | 50 | 80 | ||
| 7 | Rated short-time withstand current(4s) | 20 | 31.5 | ||
| 8 | Rated peak withstand current | 50 | 80 | ||
| 9 | Rated breaking current of a single capacitor bank | A | 630 | ||
| 10 | Rated back-to-back capacitor bank breaking current | 400 | |||
| 11 | Rated short-circuit breaking current breaking times | Times | 50 | ||
| 12 | Mechanical lifespan | 20000 | |||
| 13 | Rated operating sequence | O-0.3s-CO-180s-CO | |||
Working conditions
Normal Operating Conditions
1. Ambient temperature
Maximum: +40°C, minimum: –15°C. The average value measured over any 24‑hour period shall not exceed +35°C.
2. Humidity conditions
Average relative humidity for a day: ≤95%
Average relative humidity for a month: ≤90%
Average water vapour pressure for a day: ≤2.2 kPa
Average water vapour pressure for a month: ≤1.8 kPa
3. Altitude
Not exceeding 1000 m above sea level.
4. Air purity
The surrounding air shall not be significantly contaminated by dust, smoke, corrosive or flammable gases, vapours, or salt spray.
5. Vibration and shock
Any external vibration or ground movement that may affect the switchgear shall be negligible.
6. Electromagnetic interference in secondary systems
The amplitude of induced electromagnetic interference shall not exceed 1.6 kV.
Special Operating Conditions
When the 22KV Medium Voltage Metal Clad Switchgear is required to operate under conditions exceeding the normal limits specified in GB/T 11022, the manufacturer and the user shall negotiate and agree upon special measures.
To prevent condensation, the switchgear is equipped with heaters. These heaters shall be energised whenever the switchgear is in standby mode. Even during normal operation, attention shall be paid to keep the heaters in service as necessary.
What is the main structure of KYN28-24?
The KYN28-24 switchgear mainly consists of two parts: the cabinet and the truck.
Cabinet structure
The cabinet is divided by metal partitions into four independent compartments.
1.Busbar compartment
Located in the upper rear part of the cabinet, used for installing the main busbars.
2.Circuit breaker compartment
Located in the middle part of the cabinet, used for installing the circuit breaker truck.
3.Cable compartment
The cable room is located in the lower rear part of the cabinet, used for connecting incoming and outgoing cables. It can also accommodate the components such as current transformers and earthing switches.
4.Relay and instrument compartment
Located in the upper front part of the cabinet, used for installing secondary components such as protection, control, and measuring devices.
Truck types
The truck is a movable component that carries the core elements. It is moved in and out by means of a screw mechanism. According to their functions, trucks are mainly classified into the following types:
1. Circuit breaker truck:The most common type, used for making and breaking normal load currents and fault currents.
2. Voltage transformer (PT) truck:Used to provide voltage signals for measurement and protection purposes.
3. Metering truck:Used for electrical energy metering.
4. Isolating truck:The disconector trolley usually used to create a visible disconnection point in the circuit, ensuring safety during maintenance.
Main Features and Advantages
1.High Safety
The 22KV Medium Voltage Metal Clad Switchgear equipped with comprehensive "five-prevention" functions, using mechanical and electrical interlocks to effectively prevent misoperation. They are fully metal-clad and partitioned shell divides the cabinet into multiple independent compartments, preventing accident spread and ensuring high safety. Their pressure relief channels are provided to protect operator safety in the event of an internal arc fault.
2. Flexibility and Reliability
Adopts a center‑mounted draw‑out truck structure. All trucks of the same specification are 100% interchangeable, facilitating easy maintenance and replacement. Compatible with various well‑known brands of vacuum circuit breakers (e.g., VS1, VD4), offering good versatility. The use of aluminum‑zinc coated steel plates and multiple bending processes results in high mechanical strength and strong corrosion resistance.
3. Convenient Maintenance and Space Saving
The kyn28-24 series 22KV Medium Voltage Metal Clad Switchgear supports wall‑standing installation and front‑access maintenance, greatly reducing the space required for installation and servicing. The spacious cable compartment provides ample room for connecting multiple cables and simplifies the fabrication and installation of cable terminations.
Production Workshop
How TO Choose?
When making a selection, it is recommended to clarify the following key parameters and functional requirements:
1. Electrical parameters
Please determine these below key technical parameters such as the rated voltage, rated current, and rated short-circuit breaking current of the system before order.
2. Functional scheme
Before purchasing, Please identify the required functional scheme, such as incoming feeder cabinet, outgoing feeder cabinet, PT cabinet, metering cabinet, bus tie cabinet, etc.
3. Core components
Need to sure the brand or technical requirements for core components, including circuit breakers, current transformers, voltage transformers, earthing switches, etc before your order.
4. Intelligent requirements
Please confirm whether intelligent features such as online monitoring and power IoT sensing are required.
5. Special environments
For use at high altitudes, order the plateau type and consult the manufacturer to meet specific operating conditions.
Schematic diagram of KYN28A-24 switchgear structure
Installation Foundation and Bottom Plate Hole Size Diagram
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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