| 摘要 |
PURPOSE:To prevent the relay of a supervisory circuit, exercising a supervision via a junction line, from malfunctioning, by canceling excitation by a current that causes malfunction by providing a secondary winding to a supervisory relay. CONSTITUTION:Unit I equipped with a supervisory circuit is connected to the opposite unit II via junction line L. Prior to the start of a supervision, contacts t<0> and t<1> are operated to flow discharging current i1 of floating capacity Cl of junction line L, causing malfunction, to the 1st winding P of supervisory relay A through the operation of contact t<0>. On the other hand, charging current i2 of storage battery C flows through the secondary winding S of relay A through the operation of contact t<1>. Here, winding S is connected that the excitation direction of relay A by current i2 will oppose to that by current i1. Therefore, excitation by currents i1 and i2 are canceled and malfunction of supervisory relay A can be prevented. |
