Abstract
Three-zone distance protection and four-zone zero sequence over-current protection are traditional relay protection schemes used for tapped-lines that connect distributed photovoltaic, wind, and small hydro power sources into a distribution network. These protection schemes cannot quickly clear the faults that occur at the end of the protected line. A newly developed non-communication protection scheme for tapped-line and double-circuit line tested at Gansu Power Grid can significantly speed up fault clearing at the end of the lines, and achieve fast tripping for the entire line section. This protection scheme also shows advantageous results for distribution grid with distributed generation.
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