Abstract
10kV switchgear bus arc protection based on current lockout criterion has the disadvantage of insufficient sensitivity when single-phase fault occurred. This paper proposes a new type of 10kV switchgear arc protection on the basis of voltage lockout. The electrical characteristics of 10kV ungrounded systems of various short-circuit fault are analyzed by simulation calculation. Analysis results show that the new 10kV switchgear voltage lockout arc protection has a higher sensitivity than arc protection based on the current lockout.
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