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KYN28A-12(2Air-Insulated Withdrawable Metal-Clad Switchgear - China Factory Suppliers for 15-24kV Solutions
Detail introduction
The KYN28A switchgear meets the requirements of IEC298, GB3906 and other standards, and has interlocking functions to prevent pushing-pulling circuit breaker handcart with load, prevent accidental opening and closing of the circuit breaker, prevent closing of the circuit breaker when the earthing switch is in the closed position, prevent accidental entry into the live compartment, and prevent accidental closing of the earthing switch when charged.
KYN28A switchgear is a mid-mounted, miniaturized, metal-clad, and air insulated switchgear. According to the different purposes of the mid-mounted handcart, it can be divided into: circuit breaker handcart, contactor handcart, load switch handcart, isolation handcart, PT handcart, metering handcart, fuse handcart, lower PT handcart, lower lightning arrester handcart, etc. The main switch can be equipped with vacuum circuit breakers from domestic or foreign manufacturers such as VS1 (VTD6), VT19, VD4, etc., which is actually a high performance distribution device.
The design and manufacturing of KYN28 switchgear comply with the following standards:
| IEC62271-200 | AC metal-clad switchgear and control equipment with rated voltage of 1kV and above & 52kV and below |
| IEC62271-100 | High voltage switchgear and control device - Part 100: AC current circuit breakers |
| GB/T3906 | 3.6kV - 40.5kV AC metal-clad switchgear and control equipment |
| GB/T11022 | Common technical requirements for high-voltage switchgear and control equipment standards |
| GB/T1984 | High voltage AC circuit breaker |
| DL/T404 | 3.6kV - 40.5kV AC metal-clad switchgear and control equipment |
Service Conditions
- Altitude: ≤1000m;
- Ambient temperature: -15℃~ +45℃(-25℃ is allowed to transport and storage);
- Relavent humidity: daily average humidity ≤ 95%，monthly average humidity ≤ 90%;
- Suitable for condensation and Class II polluted environments;
- The seismic intensity shall not exceed Grade 8;
NOTE: If the clients deviate normal operating, please communicate with manufacturer.
Technical Date
Technical Parameter of KYN28A-12 Switchgear
| Item | Unit | Parameter | |
| Rated voltage | kV | 12 | |
| Rated frequency | Hz | 50/60 | |
| Rated insulation level | 1min Power frequency withstand voltage (isolating fracture) | kV | 42/48 |
| Lightening impulse withstand voltage (isolating fracture) | kV | 75/85 | |
| 1min Power frequency withstand voltage of auxiliary circuit | V | 2000 | |
| Rated current | A | 630, 1250, 1600, 2000, 2500, 3150, 4000, 5000 | |
| Rated short circuit breaking current (r.m.s) | kA | 20, 25, 31.5, 40, 50 | |
| Rated short circuit making current (peak value) | kA | 50, 63, 80, 100, 125 | |
| Rated short time withstand current (4S, r.m.s) | kA | 20, 25, 31.5, 40, 50 | |
| Rated peak withstand current | kA | 50, 63, 80, 100, 125 | |
| Rated voltage of auxiliary control circuit | V | DC110/220 AC220 | |
| Degree of protection | Enclosure: IP4X | ||
| Overall dimension (W×D×H) | mm | 650×1500/1660×2300 800×1500/1660×2300 1000×1500/1660×2300 | |
| Note: For rated currents of 4000A and above, forced air cooling is required. | |||
Technical Parameter of KYN28A-24 Switchgear
| Item | Unit | Parameter | |
| Rated voltage | kV | 24 | |
| Rated frequency | Hz | 50/60 | |
| Rated insulation level | 1min Power frequency withstand voltage (isolating fracture) | kV | 65/79 |
| Lightening impulse withstand voltage (isolating fracture) | kV | 125/145 | |
| 1min Power frequency withstand voltage of auxiliary circuit | V | 2000 | |
| Rated current | A | 630, 1250, 1600, 2000, 2500, 3150 | |
| Rated short circuit breaking current (r.m.s) | kA | 20, 25, 31.5 | |
| Rated short circuit making current (peak value) | kA | 50, 63, 80 | |
| Rated short time withstand current (4S, r.m.s) | kA | 20, 25, 31.5 | |
| Rated peak withstand current | kA | 50, 63, 80 | |
| Rated voltage of auxiliary control circuit | V | DC110/220 AC220 | |
| Degree of protection | Enclosure: IP4X | ||
| Overall dimension (W×D×H) | mm | 800×1860/2260×23801) 1000×1860/2260×2380 | |
| Note: 1) Rated current ≤ 1250A | |||
Structure
KYN28A switchgear is designed as per the standards of insulation matel-clad switchgear , conforms to IEC62271 and GB/T3906. The whole structure has two main parts, such as cabinet body and mid-mounted withdrawable unit (or handcart), as shown in diagram 1. It has bottom cable incoming & outgoing scheme、overhead incoming & outgoing scheme and other function scheme which can constitute many schemes about power distribution devices. The switchgear could install, adjust and maintain at the front., so it can be installed in double row back to back or face to face and also can installed by way.
Outline Dimensions and Internal Structure Diagram of Typical Scheme KYN28A-12/1250-31.5
Compartments & Components List:
A. Instrument Compartment B. Circuit breaker compartment C. Busbar Compartment D. Cable Compartment
1. Pressure relief device 2. Cabinet frame 3. Branch busbar 4. Busbar bushing
5. Main busbar 6. Contact device 7. Static contact box 8. Current transformer
9. Earthing switch 10. Cable 11. Lightning arrester 12. Heater
13. Cable cover plate 14. Earthing busbar 15. Earthing switch operating mechanism
16. Withdrawable horizontal clapboard 17. Circuit breaker handcart
18. Secondary plug device 19.Valve 20. Detachable clapboard 21. Small control busbar
| Item | Unit | Parameter | |
| Height (H) | mm | 2320 | |
| Width (W) | Rated Current of Branch Busbar ≤ 1250A Rated short time withstand current ≤ 31.5kA |
mm | 630(optional) 800 |
| Rated Current of Branch Busbar ≤ 1250A-1600A Rated short time withstand current ≤ 31.5kA |
mm | 800 | |
| Rated Current of Branch Busbar ≥ 2000A Rated short time withstand current ≤ 31.5kA |
mm | 1000 | |
| Depth (D) | Cable incoming & outgoing | mm | 1450 |
| Overhead incoming & outgoing | mm | 1610 | |
| Weight | kg | 700~1200 | |
Outline Dimensions and Internal Structure Diagram of Typical Scheme KYN28A-24/1250-31.5
Compartments & Components List:
A. Instrument Compartment B. Circuit breaker compartment C. Busbar Compartment D. Cable Compartment
1. Main busbar 2. Branch busbar 3. Contact box device 4. Current transformer 5. Earthing switch
6. Primary cable 7. Circuit breaker 8. LV connector plug 9. Valve device
| Item | Unit | Parameter | |
| Height (H) | mm | 2380 | |
| Width (W) | Rated Current of Branch Busbar ≤ 1250A Rated short time withstand current ≤ 31.5kA |
mm | 800(optional) 1000 |
| Rated Current of Branch Busbar ≤ 1250A-3150A Rated short time withstand current ≤ 31.5kA |
mm | 1000 | |
| Depth (D) | Cable incoming & outgoing | mm | 1810 |
| Overhead incoming & outgoing | mm | 2200 | |
| Weight | kg | 850~1400 | |
Frequently Asked Questions (FAQ)
What standards does the KYN28A switchgear comply with?
The design and manufacturing of KYN28A switchgear comply with major international and domestic standards, including IEC62271-200, IEC62271-100, GB/T3906, GB/T11022, GB/T1984, and DL/T404.
What interlocking safety functions are built into the KYN28A?
It features interlocking mechanisms to prevent pushing/pulling the circuit breaker handcart with load, prevent accidental opening/closing of the circuit breaker, prevent closing when the earthing switch is closed, prevent accidental entry into live compartments, and prevent closing the earthing switch when charged.
What are the environmental service conditions required for standard operation?
It requires an altitude of ≤1000m, ambient temperatures between -15℃ and +45℃, daily average humidity ≤95% (monthly ≤90%), suitability for condensation/Class II polluted environments, and seismic intensity not exceeding Grade 8.
What types of mid-mounted handcarts can be configured?
Depending on the application, handcarts can include circuit breaker, contactor, load switch, isolation, PT, metering, fuse, lower PT, and lower lightning arrester handcarts.
When is forced air cooling required for the KYN28A switchgear?
For KYN28A-12 switchgear, forced air cooling is mandatory for configurations with rated currents of 4000A and above.
What is the enclosure protection rating of the KYN28A switchgear?
The switchgear enclosure provides a protection degree of IP4X to prevent external solid objects from entering the cabinet frame.