Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-64 973.334.3100
The relay operate characteristic is defined as:
180.0
1
95.5
_
2
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 below
Figure 13-42 USA Inverse TOC Characteristic
13.5.1.6.2.4.3 USA Very Inverse TOC Characteristic