| 摘要 |
PURPOSE:To ensure the following even to the frequent actions carried out to the variation of the system conditions and the load by selecting a controller after deciding whether are deviation between the system voltage and the reactive voltage which is generated by the variation of the back voltage at the system side. CONSTITUTION:Both the system voltage and the reactive power of systems 1-3 are measured by a CPU76 via input signal converters 71-75 of a voltage-reactive power controller 7. The CPU76 identifies the initial value from said measured value as well as the system reactance from the initial value and its variation. Then the CPU76 decides whether the deviation between the system voltage and the reactive power which is due to the variation of the system back voltage satisfies a specific function relation decided by the prescribed system voltage, the blind sector width of the reactive power and reactance respectively. Based on this decision, the CPU76 selects a tap switch 41 or a breaker 51 for shunt reactor and a breaker 61 for static capacitor via output signal converters 77-79. These controllers are sequentially operated. |
