Instantaneous Earth Fault Relay Working. Consider a feeder as shown in fig 173 with earth fault relays R1 and R2. The relay co-ordination is not necessary.
Working Group D24 Report to the Line Protection Subcommittee. A piece of iron is so fitted by hinge support. Phase-Ground Fault 3-Line Drawing 44 Figure 1-52.
The earth fault can be dispersed by using the restricted earth fault protection scheme.
Wp_ad_camp_2 The relay operates irrespective of the time when the fault current reaches the pre-set value. Earth Fault Time Delay Instantaneous Earth Fault Trip 50mS Time Delays Accuracy 004 seconds Exceptions Earth Fault Trip 40mS-00 11 x setting 30mS-00 2 x setting 20mS-00 5 x setting Relay. Working Group D24 Report to the Line Protection Subcommittee. 2005 CT is connected to instantaneous relay.
