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公开(公告)号：US3629658A
公开(公告)日：1971-12-21
申请号：US3629658D
申请日：1970-05-07
Applicant: ASEA AB
Inventor： HELGE ANDERS , JOHANSSON TORKEL
CPC classification number: H02H3/40
Abstract: A static impedance relay for controlling a circuit includes a switch operated by a relay coil which is connected to a zero detector. The zero detector is fed with a first pulsating voltage which is proportional to the current supplied and a second voltage which is the algebraic sum of a direct voltage proportional to the voltage supply and a second pulsating voltage adjustably proportional to the voltage supply.
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