Abb ring main unit – safering 36 RMU ABB MV Products
Description
Abb ring main unit – safering 36 RMU ABB MV Products
ABB Safering 36 RMU , Ring Main Unit (RMU) is a compact, sealed for life metal-enclosed switchgear widely used in Urban Power Distribution Network. . Some of the key features of the RMU includes SF6 gas insulation, compact and modular construction, integral protection system, fully extendable options, and low maintenance.
FEATURES
- Compact
- Metal enclosed design
- Type tested acc. to all relevant IEC standards
- Manufactured acc. to ISO 9001 and 14001
- Recyclable and very low environmental impact
- Maintenance free
- Arc proof
- Extensible in both directions
- No exposure of live parts
Ring Main Unit, RMU is a compact, enclosed and sealed type of Switchgear used for medium voltage power distribution. It is a complete Switchgear in itself. A complete Switchgear means, assembly of required switching devices, protection device as well as metering device. RMU of different voltage (mostly 12 kV and 24 kV) and current ratings are available. Indoor as well as outdoor types of Ring Main Units are available.
Ring Main Unit comprises of one incomer feeder and one or more outgoing feeder. The incomer feeder is either Vacuum Circuit Breaker or SF6 Circuit Breaker with associated Disconnect Switch and Earth Switch. This incomer feeder is given with the provision of bushing protruding from the enclosure of RMU for supply cable connection.
Outgoing feeder comprises of Load Break Switches with associated Disconnect Switch and Earth Switch. Provision for cable connection is provided in outgoing feeder. The Load Break Switch is nothing but an isolator having the capability of breaking the circuit during on load condition.
TECHNICAL DETAILS
| C Module | F module | ||||
| Switch | Earthing Switch | Vacuum circuit breaker | Earthing switch / disconnector | ||
| Power frequency withstand voltage kV | 70 | 70 | 70 | 70 | |
| – across disconnector kV | 80 | 80 | 80 | 80 | |
| Impuls withstand voltage kV | 170 | 170 | 170 | 170 | |
| – across disconnector kV | 195 | 195 | |||
| Rated current A | 630 | 200 | |||
| Short circuit making current kA | 50 (5 times) | 50 (5 times) | 2) | 12,5 / 12,5 | |
| Short time current 1 second kA | 5-May | ||||
| Short time current 3 seconds kA | 16 | 16 | |||
| Internal arc fault 1 second kA Mechanical endurance close/open | 20 | 20 | |||
| – manually operated | |||||
| 1000 | 1000 | 1000 | 1000 | ||
| – with actuator | 5000 | – | 5000 | – | |
| Temperature class oC | -65 | -65 | -65 | -65 | |
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