CODING TECHNIQUES FOR SECURE DIGITAL-COMMUNICATIONS FOR UNIT PROTECTION OF DISTRIBUTION FEEDERS

The dramatic growth in new designs of microprocessor relays has led to a growth in the use digital communications for protection. Unfortunat ely in any communication system there will always be some corruption o f the received data. Part of the art and science of relay design is th erefore to take this into account. This paper examines coding techniqu es designed to minimise the probability of corrupted data being declar ed as healthy. Message size, coding techniques and interleaving are ex amined with respect to the choice of a coding strategy for a secure da ta communication system for unit protection.