![]() Whilst the start and finish ends of the ring are at the same location, power is delivered by both pathways of the ring into substations located around the ring. Figure 3 – Parallel feeder systemĪ similar level of system reliability to that of the parallel arrangement can be achieved by using ring main feeders. This usually results from the growth of load supplied by a parallel feeder where the cabling has been installed along different routes. These are most common in urban and industrial environments. Parallel feeders are more common in urban areas or for feeders to large single customers, where load shedding in an emergency may be possible. To improve the reliability factor it may be possible to have the separate sets of cables follow different routes. In this case the capital cost is double that of a radial feeder but there is a greater reliability factor for the line. This may be justified if the load is higher, more customers are being supplied, or there are loads such as hospitals which require high levels of reliability. For these types of applications, paralleling controls-only solutions are available. In the event of a line fault only one of the feeder sets of cables will be affected, thus allowing the remaining parallel feeder to continue to supply the load. There are systems, such as in medium and high voltage generator set applications, where the preference is to keep the paralleling controls separated from the generator sets as well as from the distribution switchgear.
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