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Islanding Effects on Distributed Photovoltaic Grid Transformers

Islanding refers to the condition of a distributed generation (DG) generator continuing to power a location even though power from the electric utility is no longer present. Consider for example a distributed solar facility that has solar panels that feed power back to the electrical grid; in the case of a power blackout, if the solar panels continue to power the distributed solar facility, the solar facility becomes an “island” with power surrounded by a “sea” of unpowered distributed solar facilities in a distributed solar grid system. This condition may prove dangerous and sometimes fatal to humans if not properly monitored and controlled.

There are two types of islanding: ...

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