Art and science of protective relaying by russell mason pdf
ECE Protection of Power Systems II, SpringDownload eBook. The general practice is to employ a set of two or three over current relays and a separate over current relay for single line to ground fault. To understand the characteristics and functions of relays and protection schemes. Continuing in the bestselling tradition of the previous editions by the late J. Main protection to outgoing feeders and bus couplers with adjustable time delay setting. To understand CTs and PTs and their applications in protection schemes. Netic Relay01 The entire wiring of circuitry for indications, alarms, metering and protection should be permanent wiring.
FMPR-103 pt3 l Power Systems Protection (Circuit Breaker Theory) v1
Protective Relaying Theory and Applications pdf
The function of protective relaying is to cause the prompt removal from service of any element of a power system when it suffers a short circuit, or when it starts to operate in any abnormal manner that might cause damage or otherwise interfere with the effective operation of the rest of the system. The relaying equipment is aided in this task by circuit breakers that are capable of disconnecting the faulty element when they are called upon to do so by the relaying equipment. Circuit breakers are generally located so that each generator, transformer, bus, transmission line, etc. These circuit breakers must have sufficient capacity so that they can carry momentarily the maximum short-circuit current that can flow through them, and then interrupt this current; they must also withstand closing in on such a short circuit and then interrupting it according to certain prescribed standards. Fusing is employed where protective relays and circuit breakers are not economically justifiable! Although the principal function of protective relaying is to mitigate the effects of short circuits, other abnormal operating conditions arise that also require the services of protective relaying. This is particularly true of generators and motors.