Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-63 973.334.3100
The relay operate characteristic is defined as:
0226.0
1
0104.0
_
02.0
M
tdtimeoperate
Where td is the time dial setting and M is the multiple of the pickup current:
setting pickup
current measured
M
The characteristic is shown graphically as follows.
Figure 13-41 USA Moderately Inverse TOC Characteristic
13.5.1.6.2.4.2 USA Inverse TOC Characteristic