22 One-line diagram showing a partial-differential or bus-overload relaying scheme. ... close to reestablish normal voltage and to pick up the other loads. ... These relays are generally used as power-flow sensors to control backfeed or reverse power flow. ... Single-phasing protection is necessary when 3-phase motors are served from a system that is protected by single-phase devices, either fuses or lineanbsp;...
|Title||:||Switchgear and Control Handbook|
|Author||:||Robert W. Smeaton|
|Publisher||:||McGraw-Hill Companies - 1987|