A frequency detector detects a system frequency from an AC voltage on an AC power line to which a power conditioner performing system interconnection of a distributed power supply is connected. A power converter is configured to inject lead reactive power ...

The power supply system (1) for arc furnace (2), includes:- a power converter (9), and- a polyphase transformer (10),The power supply system further comprises first disconnecting means (13) connecting the input of the power converter to the primary circuit...