Grid networks provide maximum reliability and operating flexibility.
These networks are the most economical and effective method in serving the high density loads in metropolitan cities. The grid is simultaneously
supplied from several feeders. In the grid network, no consumer outage is caused by switching off the primary feeder for scheduled maintenance.
Voltage regulation is improved since power flow to the consumer is through several transformers operating in parallel (see Fig. 1.3f). The grid can handle abrupt load changes and disturbances associated with large
motor starting, without severe voltage dips or surges. A strong grid network is sufficiently stiff and a fault in one unit does not disrupt voltage
outside the sensitive load tolerance limits.