ABSTRACT
If ¼ VphZph ¼ 440/p3/0:0404/26:95 ¼ 6:67/ 26:95 kA
6.9.1.3 Supply reliability
In practice, the fault is located and isolated and other consumers restored by switching operations, leaving only those consumers directly connected to the faulty section off supplies until the fault is repaired. Restoration of supplies is therefore within ‘switching times’ for the majority of consumers. Rural networks are fed by overhead systems and are there-
fore subjected to faults of a transient nature, such as lightning, ice and windborne objects. Often these are non-damage faults, and so the controlling circuit-breaker is arranged to reclose automatically. A typical sequence is shown in Figure 6.9.4. Transmitter supplies may be subject to such sequenced interruptions of supply.
