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RMSYS switchboard (Ring Main Unit - RMU) is composed by a stainless steel tank containing all the switching device and live parts: three position on-load switches (closed, open and earthed), vacuum circuit breaker or fuses for the protection of the transformer and/or outgoing lines.
A relief valve ensures the safety in the event of overpressure inside the container, in accordance with the standards IEC 62271-1.
A manometer placed on the front constantly monitors the internal pressure.
The switchboard is completed with a supporting metal structure divided into separate operating units.
|
Rated voltage |
kV |
12 |
24 |
|
Rated power-frequency withstand voltage 50Hz 1min |
kV (r.m.s.) |
28 (42)* |
50 (75)* |
|
Rated lightning impulse withstand voltage |
kV (peak) |
75 (95)* |
125 (150)* |
|
Rated frequency |
Hz |
50-60 |
|
|
Rated current main bus bars up to |
A |
630 |
|
|
Rated current functional units |
A |
630 |
|
|
Short-time withstand current |
kA |
20 - 3s |
|
|
Peak value |
kA |
50 |
|
|
Withstand internal arc |
kA |
20 - 1s |
|
|
Protection degree stainless steel tank |
IP |
67 |
|
* Data for the Russian market in accordance with GOST standard.
