RFL Electronics GARD 8000 - Figure 13-45 IEC Standard Type a TOC Characteristic

Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-67 973.334.3100
The relay operate characteristic is defined as:








1
14.0
_
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 below.
Figure 13-45 IEC Standard Type A TOC Characteristic
13.5.1.6.2.4.6 IEC Standard Type B TOC Characteristic
0.1 1 10 100
0.01
0.1
1
10
100
0.05
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Time Dial
Setting
Multiples of Pickup
Time (seconds)