Distribution Single-Phase Tripping and Reclosing
An increased focus on service reliability causes many utilities to look at their distribution protection practices . Although modern power distribution systems use single-phase protective devices, utilities have been reluctant to consider singlepole tripping on the main three-phase line for a variety of reasons, including a desire to protect three-phase loads, difficulty coordinating devices along the feeder, and loss of sensitivity of the protective devices for low-magnitude faults. Each of these concerns is valid, but because of the obvious benefits to reliability, utilities are looking for solutions to these problems. Over the past several years, the industry has begun implementing single-pole tripping with microprocessor-based recloser controls on distribution feeder circuits.
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