Study on Internal Arc Proof for Medium-voltage Distribution Panels of Nuclear Islands

An introduction is being presented to causes leading to internal arc failures of general distribution panels as well as related harms and preventative measures,while internal arc-proof devices adopted by Lingao Nuclear Power Station Phase II analyzed.By studying the secondary wiring drawings of medium-voltage distribution panel and the logic diagram of medium-voltage distribution system,a protection scheme is proposed based on combination of switching logics for both the internal arc-proof device and the house power system.