UNINTERRUPTIBLE SWITCHER FOR HIGH VOLTAGE MACHINE

摘要

PURPOSE:To prevent the electric shock accident positively when a bypass circuit is formed without interrupting power supply at the time of replacing a power meter. CONSTITUTION:A bypass circuit B on the load side of a gas switch 8 is provided with an instrument voltage current transformer 20 connected with a watthour meter 21. The watthour meter 21 measures power being fed through the bypass circuit B to a consumer. The instrument voltage current transformer 20 comprises a transformer 23 connected, on the primary, with each phase of the bypass circuit B. A disconnector 25 is arranged between the bypass circuit B and the primary of the transformer 23 connected with phases U and W. Since the disconnector 25 disconnects the primary of the transformer 23 from a branch line at the time of forming the bypass circuit B, no voltage is applied from the branch line to the ground through the transformer 23.