Theoretical Investigation of Electric Transmission Systems under Short-Circuit Conditions

The following features of a transmission system under short-circuit conditions are discussed: 1. Mechanical forces between the phases of three-conductor, three-phase cables when carrying short-circuit current; also the forces between busbars are investigated. 2. The heating of the conductors of the cable from the instant of short circuit to a time 0.8 seconds later is traced analytically, during the transient state of the current, and typical computed heating curves are presented. 3. The effectiveness of the method of placing reactors between generator terminals and the bus from which power is taken, and additional reactors between generators and an auxiliary synchronizing bus, is analyzed. 4. This scheme is compared with the present well-recognized schemes of feeder and busbar reactors.