Ring Main Units
SABRE Range – SF, Gas Insulated Vacuum RMU
The SABRE range of RMU combines the most advanced Vacuum & SF, technologies to meet the modem day requirements. It is fully extensible and highly flexible unit used in a wide range of applications including distribution switchboards, transformer substations, ring distribution networks and HV Connections to industrial & commercial sites. The units are developed to suit customer requirements for connection, supply, protection and sectionalising with remote operation.
The SABRE RMU’s ensure protection in the form of a circuit breaker being monitored & controlled by a self powered numerical relay. The sectionalising is enabled through ring switches.
Salient Features :
- Stainless steel enclosure fabricated by automatic robotic welding.
- Isolation in clean SF „gas for Ring switch & in vacuum for CB.
- Suitable for Indoor& Outdoor application.
- Common Switching chamber with Vacuum Tee off circuit breaker.
- Enhanced duty in excess of IEC requirement. I All switch positions have pad-locking & Casten interlocking
- Internal arc protection including cable boxes.
- Extensible from both the sides.
- Fully SCADA compatible unit with remote switching.
Circuit Breaker - The CB comprises of 3 vacuum interrupters, which have a fault-make, fault-break rating. Earthing of the outgoing cable is achieved by the use of CB in series with the off-load disconnector / selector switch. This will enhance the making capacity of the Earth switch.
Ring Switch - These are fault-make load break switches utilising a single break 3 position switches viz., ‘ON’, ‘OFF& tarth’functions.
Operation & Safety - All operating positions and instructions are indicated on the main panel at the front of the unit. Both manual & automated versions are available in SABRE range.
Live Parts are contained within an earthed stainless steel enclosure with positive safety interlocks on all switch / selector positions ensure operator safety & prevent incorrect operation. The system is fully With the most advanced vacuum switching technology in an SF, gas filled enclosure, the units are compact and are easy to install & operate. Characterized by their reliabili.
- 4 Earth Fault indicators /Fault passage indicators
- 4 Metering module
- 4 Motorized kit for automation.
Product Variants
| Code | Product Description |
| VRN | Vacuum Ring Main Unit-Non Extensible |
| VRE | Vacuum Ring Main Unit— Extensible |
| VCE | Vacuum Circuit Breaker-Extensible |
| SSE | Single Switch —Extensible |
| DSE | Double Switch —Extensible |
Technical Data
| Characteristics | SABRE • VRE | VRNa | SABRE |
| Rated Voltage kV | 12 / 15.5 | 24 | |
| Rated Current A | 630 | 630 for Ring Switch & 400 for CB |
|
| Symmetrical Breaking Capacity kA / sec | 21 / 3 | 16 / 3 | |
| Making Current kAp | 52.5 | 40 | |
| Impulse Withstand kVp | 75 / 110 (optional) | 125 | |
| Min Gas Pressure Bar | 0 | ||
| Filling Pressure Bar | 0.4 | 0.5 | |
| Index of protection | IP 54 | ||
| Cable termination | |||
| Incoming | Side Bottom | Side Bottom | |
| Tee off | Rear Bottom | Rear Bottom | |
| Cable Tests | Bottom | Bottom | Bottom |
| Dimensions | |||
| Width | 935 | 948 | 935 |
| Depth | 1030 | 1085 | 1078 |
| Height | 1333 | 1750 | 1470 |
| Weight kg | 410 | 350 | 450 |
