Eaton RVAC - Typical Functions

Instruction Leaflet IL0102002E
Effective April 2018
Ring Main Unit Operation Instruction
7EATON CORPORATION www.eaton.com
6. Typical functions
A RMU of 12kV typical scheme is composed of three circuits - one
cable incoming circuit, one cable feeding circuit and one
combination unit outgoing circuit. The load switches on the cable
incoming circuit and the cable feeding circuit can reset the circuits
in time to resume power supply when isolating fault line
segments. The load switch and fuse of the combination unit
protect the downstream loads, while its load switch also conducts
opening-closing and isolation on the fuse and the downstream
loads.
The supply circuit of the RMU is operated in open loop.
The RUM is usually energized in the forms shown in Figure 1, 2
and 3.
Dual-power supplied ring network power supply system
Two-independent-power supplied ring network power supply system
The ring network power supply system with only one power supply
Note: a) “ ” RMU b) “K” open loop point
Figure 1
Figure 2
Figure 3