CLOCK SYNCHRONIZATION IN RELAY PROTECTION SYSTEMS

The paper deals with the design of microprocessor protection systems a nd a relay protection information provision service in relation to a c lock synchronization problem. A simultaneity criterion of microprocess or differential current line relay protection readings and simultaneit y criteria when using a wave principle for detecting the distance to a fault location are considered. Methods are proposed for controller ti mer synchronization in relation to the introduction of a general time service for data logging networks. An algorithm for the synchronizatio n of two initiative stations used in a differential protection system with a fibre-optic communication channel is given. Copyright (C) 1996 Elsevier Science Ltd.