| 摘要 |
<p>PURPOSE:To remove the mutual interference and miniaturize the device by a method wherein an intermediate electrode in a pipe line is divided into two, and the each electrode is provided with the instrument transformer. CONSTITUTION:The main and subintermediate electrodes 12, 13 are fitted to a main circuit conductor 11 in the pipe line 10. The electrode 12 is led outside through a bushing 14, being connected to a main capacity 15 which is grounded at one end, and a divided voltage of the main capacity is applied to a primary winding 17a of the main transformer through a main reactor 16. Likewise, the subintermediate electrode 13 is connected to a voltage dividing capacitor 19 through the bushing 18 and the divided voltage is applied to a primary winding 21a of the subtransformer through a subreactor 20. Further, the second windings 17b, 21b of the respective transformers are connected to a voltage differential relay 22 to prevent the mulfunction of the relay. In this event, the voltage dividers respectively are completely independently constructed by the main and subintermediate electrodes 12, 13 and the main and subintermediate voltage dividing capacities 15, 19, so that the respective circuits of the main, subtransformers 17 and 21 are not interfered with each other and the small-sized device of the high reliability can be obtained.</p> |
