| 摘要 |
PURPOSE:To prevent unexpected service interruption due to a ground relay by grounding a conductor outer box through a transformer. CONSTITUTION:High-voltage equipments such as a high voltage circuit breaker 24, transformers T1phi, T3phi, a transformer PCT for a meter, a phase advancing capacitor C, etc., are installed to an iron base, and connected to a conductor outer box 1 by electric wires 25. The conductor outer box 1 is disposed through an insulator, and grounded only by a grounding conductor 7 from a grounding terminal 1a. Consequently, since grounding currents due to the insulation deterioration of the high-voltage equipments intend to flow through the ground through the grounding conductor 7, a transformer 4 is interposed in the grounding conductor 7, and currents flowing through the primary side of the transformer 4 are detected by an electric signal generated on the secondary side, and extracted to a monitor means 5, thus determining an accurate grounding current value. Accordingly, a fine grounding signal is monitored at all times, thus preventing unexpected service interruption due to a ground relay, then maintaining a planned distribution facility.
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