Answer / sreejim sreedharan

RMU (Ring Main Unit) is of two types. TRM (Triangular Ring
Main Unit) & QRM (Quadrilateral Ring Main Unit). TRM is (2
Feeder+ 1 Transformer Feeder) and QRM is (2 Feeder + 2
Transformer Feeder). RMU is mainly used for redundancy of
feeders. Sometimes it is difficult to get the Municipality
plot approval for a new Substation. In such cases we go for
a RMU as per requirement. There are 3 Feeder, 4 Feeder & 5
Feeder RMUs.

Hope it helps you. :)

Answer / hesham

RMU IS used to feed the transformer from two different feeders within ring
1- TRM ( two incomer and one outgoing feeding only one transformer 2+1 )
Or ( 1+2 ) one incomer and two outgoing feeding two S/S.

2- QRM ( 2+2 ) two incomer and two outgoing feeding two transformer
or ( 1+3 ) one incomer and three outgoing feeding three s/s.

Answer / shafi

RING MAIN UNIT IS DISTRIBUTION OF ELECTRIC POWER TO
DIFFERENT LOAD OR FEEDER, IT IS CONSISTS OF SF6 BAKER, ONE
INCOMMER AND TWO OUT GOING FEEDER

Answer / nitin

root mean squar of a substation

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