IET Volume 47 Protection of Electricity Distribution Networks

Protection of Electricity Distribution Networks- 2nd Edition
Juan M. Gers and Edward J. Holmes

In the six years since this book was first published there have been considerable advances in relay protection design. The development of powerful numerical algorithms and further improvements in digital technology have greatly extended the scope of protection systems. Most of the latest types of relays are now multifunctional devices with control, metering, reporting and alarm functions in addition to their protection capabilities that normally include several types within the same device. They also have very good communication facilities which allow them to work in virtually any automated scheme. Therefore, modem relays now offer better protection coverage and can be programmed to automatically adjust for changes in power system topologies and different operating conditions owing to the multiple setting groups feature incorporated in most of them.