With the increasing loads, voltages and short-circuit duty of distribution substation feeders, distribution over current protection has become more important today than it was even 10 years ago.

The ability of the protective equipment to minimize damage when failures do occur and also to minimize service interruption time is demanded not only for economic reasons but also because the general public just expects ?reliable? service. This publication will attempt to review some of the present distribution practices, particularly with regard to ....etc

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Pilot Relaying Schemes

¢ Pilot relaying schemes employ a communication channel in conjunction with protective relays to detect a fault in the transmission lines.

¢ High speed determination of fault locations.

¢ There are basically two types of pilot relaying schemes.

1. Blocking pilot protective scheme

2. Tripping pilot scheme

Types of channels

There are basically 3 types of channels used in pilot relaying.

1. Wire pilot- Twisted pair of copper wires used in Telephone cables.

2. Carrier current pilot- The pi ....etc

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