| 摘要 |
PURPOSE:To prevent the decay of a system voltage by calculating in advance the product of a runaround current value and a transmission impedance of a route where the current runs around to determine a voltage drop which is caused by the fact that power runs around the remaining route of a loop system after the loop is cut off. CONSTITUTION:It is basically considered that a voltage drop is caused by a runaround current. In the case that a generator is located midway through a route where the current runs around, an increase in current of the generator is compensated in expectation of a voltage maintaining capability of the generator. When a section in which a pre-current is caused to flow in the opposite direction to the runaround current exists in the route where the current runs around, a voltage is compensated for that section, supposing that a voltage is maintained to such a current value as is same with that of the initial reverse current. Therefore, the voltage drop V is determined by the following formula: V=1 (IO-Ic)XZO- the corrected voltage value ¦. Nextly, a current pulled by the load after the route is cut off is reduced by load cutoff to raise the dropped voltage to a target value. |
