| 摘要 |
<p>Measurement indicators for phase currents and voltages, via filters for fault components in such currents and voltages, are connected to a lightning disturbance tuning unit and addition units. These units, via comparator circuits are connected to OR gates in turn connected via retardation and stop circuits to an operating component which is connected to an effect switch in the protected power line. The lightning disturbance tuning unit comprises changeover switches, addition units, a comparator circuit, whole wave rectifiers with ripple filters, threshold components an AND gate, a memory, a retardation circuit, a stop circuit. This circuit is connected to the first such circuit which in turn is connected to a receiver.</p> |
