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RMSYS
12-24kV
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 |