Distance Relay Setting Examples
GARD 8000 Distance Relay
RFL Electronics Inc.
The Fast Carrier start involves two overcurrent settings; 50P-1 and 50G-1. These should be set so that
they operate for any fault behind the relay that is within the forward pilot zone of the remote relay.
(The elements are non-directional so they will also pick-up for a forward fault, but carrier will be
stopped by the local forward pilot zone.)
50P-1 should be set above load current, and below the current supervision setting of the remote relay.
Recommended setting is to use the same value as the current supervision (Reverse Sup. 2-Ph) applied
to the reverse Z4; i.e. 4.90 A for this example.
50G-1 can be set more sensitive, as it does not operate on load current. A conservative setting would
use the same value as the current supervision (Reverse Sup. 1-Ph) which in this example was 4.90 A.
A more sensitive 50G-1 setting may be required when coordinating with a remote E/M scheme. As the
operating time of E/M relays are very setting (tap) dependent, settings are typically determined by end-
to-end testing.
August 1, 2009
8-26
973.334.3100
