Summary
Rooq's ring main units (RMU) can be adapted to meet all Medium Voltage power distribution needs,up to 24 kV.
The RM6 is a compact unit combining all MV functional units to enable connection, supply and protection of transformers on an open ring or radial network:
* by a fuse-switch combination, up to 2000 kVA
* by a circuit breaker with protection unit, up to 8000 kVA.
The switchgear and busbars are enclosed in a gas-tight chamber, fi lled with SF6 and sealed for life.
Operating a distribution network sometimes requires switching oints in addition to the HV/MV substations, in order to limit the effect of a fault on the network.
The RM6 offers a choice of solutions to make 2, 3 or 4 directional connections:
* with line protection by 630 A circuit breakers
* with network switching by switch-disconnectors
* with integrated power supply telecontrol devices.
Standard
Rooq's RMU is designed in accordance with the following standards:
General operation conditions for indoor switchgears
IEC 62271-1 (common specifi cations for high voltage switchgear and controlgear)
Ambient temperature: class -25°C indoor
Altitude : lower than or equal to 2000 m
IEC 62271-200 (A.C. metal enclosed switchgear and controlgear for rated voltage above 1 kV and up to and including 52 kV)
Switch-disconnectors
IEC 62271-103 (high voltage switches for rated voltage above 1 kV and less than 52 kV)
Circuit breakers: 200 A feeder or 630 A line protection
IEC 62271-100 (high voltage alternating current circuit breakers)
Other applicable standards
* Switch-fuse combinations: IEC 62271-105:
alternating current switch-fuse combination
* Earthing switch: IEC 62271-102:
alternating current disconnectors and earthing switches
* Electrical relays: IEC 60255.
As per IEC /BSEN 60076 standards these are
set in accordance with the highest voltage for the material,
being the level immediately above the rated voltage.
| Rated voltage |
12kV |
17,5kV |
24kV |
| Frequency |
50 or 60 Hz |
| Insulation level |
|
| Industrial frequency 50Hz 1 min. insulation Ud (kv rms) |
28 |
38 |
50 |
| isolation Ud (kv rms) |
32 |
45 |
60 |
| Impulse 1.2/50us insulation Ud (kv rms) |
75 |
95 |
125 |
| isolation Ud (kv rms) |
85 |
110 |
145 |
| Tank interal arc withstand |
20kA 1s |
Manual
Audited Supplier 
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