Mitigation of arc flash hazard in photovoltaic power plants
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United States of America Patent
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Jan 19, 2016
Grant Date -
Mar 20, 2014
app pub date -
Sep 18, 2012
filing date -
Sep 18, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Arc flash mitigation devices are employed to protect personnel during maintenance of photovoltaic inverters. During normal operation, an alternating current (AC) output of a photovoltaic inverter is coupled to a low voltage winding of a step up transformer through a bus-bar (e.g., an electrically conductive interconnect), which has higher current rating than a fuse. During maintenance, the bus-bar is replaced with the fuse. The fuse may be employed in conjunction with a switch. The switch may be a disconnect switch that places the bus-bar in parallel with the fuse during normal operation, and decouples the bus-bar from the fuse during maintenance. The switch may also be a transfer switch that places either the bus-bar or the fuse in series with the AC output of the photovoltaic inverter and the low voltage winding of the step up transformer.
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