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MV/LV Power Substations Design and Schematics Notes ...· 1.1 Substation with Ring-main unit. A ring-main unit consists of two manually operated incoming isolators and a tee-off circuit to an 11kV/400V/230V transformer. The tee-off may be controlled by a circuit-breaker or a fuse-switch, both providing a measure of protection to the transformer and acting as a back-up to the LV consumer's network.

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