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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.

Main electrical characteristics

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.

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