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Electrical Technology 2019-9-13

2019-09-13View Original

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For 6–10 kV low-current grounded systems, installing a zero-sequence current transformer at the cable terminal box provides single-phase grounding protection for the line. When a single-phase ground fault occurs, a current proportional to the zero-sequence current flows through the secondary side of the zero-sequence current transformer, causing the relay to activate and send an alarm signal. ( )√

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