EXTRA/ULTRA HIGH VOLTAGE SERIES CAPACITANCE COMPENSATING DEVICE WITH CURRENT TRANSFER BRANCH

摘要

An extra/ultra high voltage series capacitance compensating device with a current transfer branch includes a capacitor bank (C), a bypass isolating switch (Gl), two floor isolating switches (G2, G3), a voltage limiter (MOV), a spark gap (GAP), a bypass circuit breaker (CBl), a damping device (D), and a current transfer branch (CB2, G4). Two floor isolating switches (G2, G3) are connected to both ends of the capacitor bank (C) respectively. The bypass isolating switch (Gl) is connected in parallel with the capacitor bank (C). The spark gap (GAP) is connected in parallel with the bypass circuit breaker (CBl), and then this parallel branch is connected in series with the damping device (D). The current transfer branch (CB2, G4), the voltage limiter (MOV) and the branch composed of the spark gap (GAP), the bypass circuit breaker (CBl) and the damping device (D) are connected in parallel to both ends of the capacitor bank (C) together. The series capacitance compensating device realizes the current transfer function when it is operated /exited, reduces the requirement of the current transfer ability of the bypass isolating switch, has a good error protected property, and solves the problem that the transfer current in the bypass isolating switch is overproof.