公开(公告)号：US20210328426A1

公开(公告)日：2021-10-21

申请号：US16850219

申请日：2020-04-16

Applicant: Southern California Edison Company

Inventor： Jesse Rorabaugh ,  Andrew Swisher ,  Benjamin Garcia ,  Matthew Webster

IPC: H02H9/08 ,  H02H3/16 ,  H02H7/045 ,  G01R31/62 ,  G01R31/52 ,  G01R31/08

Abstract: Disclosed is a system that reduces fault currents in a power grid, thereby reducing the risk of unintentionally igniting a fire when an object comes in proximity to a high voltage power line. The circuit comprises an isolation transformer, a neutral connection, a current compensating device, and an automatic recloser or other circuit interrupting type protection system. The isolation transformer may comprise a delta-delta or delta-zigzag transformer with a one-to-one ratio between the input and output voltages and phase angle. The current compensating device is connected to the neutral and configured to redirect a substantial portion of a fault current to ground through the isolation transformer neutral instead of the fault itself. The current compensating device may comprise an arc suppression coil tuned to match the capacitance of the three phase outputs, or an inverter.