Solid Insulated Smart RMU Smart Ring Main Unit
The HSIS-12 solid insulated ring main unit was developed by HCRT according to market demands which indicated that three-phase 50Hz systems with rated voltage of 12kV were common. This unit has the following advantages: modular, high electrical performance, high environmental protection, and easy installation. By being equipped with intelligent controllers such as an DTU and other related equipment, this ring main unit can realize different levels of control, measurement and protection functions, in order to meet the various requirements of our customers.
The inside of this solid insulated ring main unit adopts a rotary fuse structure, which makes the replacement of the fuse cubicle type and making it extremely easy. The size of this unit is the smallest of all gas insulation cabinets, covering the least area, and it is eco-friendly for the power supply and distribution of urban users and residential applications.
| Load Break Switch (Cabinet C) | Circuit Breaker (Cabinet V) | Switch-Fuse Combination (F) | Disconnector/Earthing Switch | |
| Rated voltage (kV) | 12 | 12 | 12 | 12 |
| Rated current (A) | 630 | 1250 | 125 | 630 |
| Rated frequency (Hz) | 50 | 50 | 50 | 50 |
| Arc extinction | Vacuum | Vacuum | Vacuum | |
| Power-frequency withstand voltage (kV) | 42 | 42 | 42 | 42 |
| Lightning impulse withstand voltage (kV) | 75 | 75 | 75 | 75 |
| Rated short-circuit breaking current (kA) | 20/31.5 | |||
| Breaking times of rated short-circuit breaking current | 30 | |||
| Rated short-circuit closing current (kA) | 50 | 50/80 | 50/31.5 | |
| Rated short-time withstand current (kA) | 20/31.5 | 20/31.5 | 20/31.5 | |
| Rated short-circuit duration (s) | 4 | 4 | 4 | |
| Rated peak withstand current (kA) | 50/80 | 50/80 | 50/80 | |
| Rated cable-charging breaking current (A) | 10 | |||
| Rated take over current (A) | 1750 | |||
| Arc duration (s) | 1 | 1 | 1 | |
| Partial discharge (pC) | ≤5 | ≤5 | ≤5 | |
| Mechanical life (times) | 10,000 | 10,000 (spring) 30,000 (permanent magnet) | 10,000 | 3,000 |
| IP class | IP67 | |||
Note: Contact HCRT if a different condition is required. We offer customized solutions as well.