| 摘要 |
PURPOSE:To improve the efficiency of a power transmission operation and to achieve discrimination of the ground fault to a ground of an insulating stand on which an apparatus such as a series capacitor or the like is arranged and installed from the dielectric breakdown of the apparatus on the insulating stand. CONSTITUTION:A difference-current detection means 15 which detects the difference current of currents flowing respectively through power-system lines 4 connected to both ends of a series capacitor and a current detection means 11 which detects a current flowing through an insulating stand 1 from the middle point of the series capacitor 7 are installed. By-pass switches 8a, 8b which are connected in parallel with the series capacitor 5 are driven and controlled on the basis of the detection currents by the difference-current detection means 15 and the current detection means 11. |
