Over Current And Earth Fault Relay. 172 Relay Co-ordination for Earth. Three over current relays connected each in each phase and one earth fault relay connected to the common point of three over current relays as shown in the figure.
About this manual This manual provides the user with basic information on the combined overcurrent and earth-fault relay REJ 525 and presents detailed instructions on how to use the. The relay module is then connected to the fault circuits so tests can be performed. Et_pb_textet_pb_text _builder_version31918 OvercurrentEarth Fault.
Calculation of phase fault overcurrent relay settings 913 Directional phase fault overcurrent relays 914 Ring mains 915 Earth fault protection 916 Directional earth fault overcurrent protection 917 Earth fault protection on insulated networks 918 Earth fault protection on Petersen Coil earthed networks 919 Examples of time and current.
1 3 Nos OC Relay for Over Current and Earth Fault Protection. The relay module is then connected to the fault circuits so tests can be performed. The use of inverse definite minimum time IDMT overcurrent and residually connected earth fault relays may give discrimination problems if a large proportion of the platform load is on the switchboard being fed. Thus with four relays as shown in fig 172 complete overcurrent protection can be provided.
