Smart Ring Main Unit
JGKIS-12 Air-Insulated Ring Main Unit Switchgear
The JGKIS-12 air-insulated ring main unit switchgear is designed by Jinguan Co., Ltd. specifically for systems with a rated voltage of 12kV and a rated current of 630~1250A. Its advantages mainly lie in its simplified structure, high reliability, and strong installation versatility. The equipment adopts vacuum arc extinguishing principle and air insulation technology. The arc extinguishing chamber is encapsulated and sealed with epoxy resin, forming a small, integrated functional module. Each phase is independently sealed, and the three phases share a common mechanism, resulting in a more simplified structure and lower maintenance costs. At the same time, the product adopts an integrated design of disconnect switch, grounding switch, and load/circuit breaker switch, with a compact structure and flexible and complete solutions, meeting the requirements of mainstream design schemes.
Suitable for urban power grids, high-speed railways, wind power plants, small factories, light mining equipment, subways and tunnels, commercial centers, shopping malls, hotels, office buildings, etc., and can also be installed in compact box-type substations.
Product Highlights
Uses high-performance three-position isolation/grounding switches, vacuum arc extinguishing, and spring operating mechanism, with a simplified structure, convenient operation, and reliable performance.
The top extended busbars and feeder terminals use natural air insulation, offering flexible expansion and strong versatility.
Technical parameters
| Item | C Unit Cabinet | F Unit Cabinet | V Unit Cabinet | |
| Load Switch Cabinet | Combined Electrical Appliance Cabinet | Circuit Breaker Cabinet | ||
| Rated Voltage (kV) | 12 | 12 | 12 | |
| Rated Current (A) | 630 | 630 | ||
| Rated Frequency (Hz) | 50 | 50 | 50 | |
| 1-minute Power Frequency Withstand Voltage (kV) | Phase-to-phase, Phase-to-ground | 42 | 42 | 42 |
| Between contacts | 48 | 48 | 48 | |
| Lightning Impulse Withstand Voltage (kV) | Phase-to-phase, Phase-to-ground | 75 | 75 | 75 |
| Between contacts | 85 | 85 | 85 | |
| Partial Discharge 1.1Ur (pC) | 20 | 20 | 20 | |
| Rated Short-time Withstand Current (kA/s) | 25/4 | 25/4 | ||
| Rated Peak Withstand Current (kA) | 63 | -- | 63 | |
| Rated Short-Circuit Breaking Current (kA) | -- | 31.5 | 25 (30 times) | |
| Rated Short-Circuit Making Current (kA) | 63 | 80 | 63 | |
| Rated Capacitive Current Switching Test | Cable Charging Current (A) | 10 | 10 | 25 |
| Overhead Line Charging Current (A) | 1 | 1 | 10 | |
| Rated Active Load Current Switching Cycles (times) | 200 | -- | -- | |
| Transfer Current (A) | -- | 3150 | -- | |
| Internal Arc Fault Test | IAC Class AFLR, 25kA, 63kA (peak), 1s | |||
| Mechanical Life (cycles) | Circuit Breaker/Load Switch | 10000 | 10000 | 10000 |
| Disconnecting Switch | 5000 | 5000 | 5000 | |
| Earthing Switch | 5000 | 5000 | 5000 | |
| Protection Class | Enclosure | IP4X | IP4X | IP4X |
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