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公开(公告)号：US11146067B2
公开(公告)日：2021-10-12
申请号：US16176528
申请日：2018-10-31
Applicant: Hatch Ltd.
Inventor： Michael Morgan Campbell , Yan Elksnis , Dong Shen
Abstract: A configuration of switches added to a line control circuit allows for switching back and forth between a configuration featuring a series-connected thyristor switch and reactor and a configuration featuring a parallel-connected thyristor switch and reactor. Connecting the reactor in series with the thyristor switch allows a controlled high-impedance circuit configuration that is particularly well adapted for cold furnace start-ups and furnace idling. In this manner, there is reduced need for such equipment as extra startup transformers, alternate low-voltage power supply configurations and temporary specialty electrical apparatus for cold furnace start-ups.
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