PRODUCT DESCRIPTION
GEK-106273L
MIF Digital Feeder Protection
2-5
2.2.1.3. IAC
CURVES
The curves for the General Electric type IAC relay family are derived from the formulae:
⎟
⎟
⎟
⎟
⎟
⎟
⎠
⎞
⎜
⎜
⎜
⎜
⎜
⎜
⎝
⎛
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+
−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+
=
3
2
*
C
I
I
E
C
I
I
D
C
I
I
B
A
TDM
T
pkp
pkp
pkp
where: T =
Operate time in seconds
TDM
=
Multiplier
setting
I =
Input current
Ipkp =
Pickup Current Setting
A to E =
Constants
Table 2.1: GE TYPE IAC INVERSE TIME CURVE CONSTANTS
IAC Curve Shape
HMI
A
B
C
D
E
IAC Extremely Inverse
Extr Inverse 0.0040 0.6379 0.6200 1.7872 0.2461
IAC Very Inverse
Very Inverse 0.0900 0.7955 0.1000 -1.2885 7.9586
IAC Inverse
Mod Inverse
0.2078
0.8630
0.8000
-0.4180
0.1947
IAC Inverse Long
Inverse Long
0.3754
17.8307
0.32
-23.7187 23.8978
IAC Inverse Short
Inverse Short
0.0442
0.0482
0.34
0.0223
0.0697
Summary of Contents for GEK-106273L
Page 19: ...GETTING STARTED 1 12 MIF Digital Feeder Protection GEK 106273L ...
Page 95: ...SETTINGS 5 38 MIF Digital Feeder Protection GEK 106273L ...
Page 101: ...I O CONFIGURATION 6 44 MIF Digital Feeder Protection GEK 106273L ...
Page 127: ...KEYPAD AND DISPLAY 8 26 MIF Digital Feeder Protection GEK 106273L ...
Page 147: ...INSTALLATION AND MAINTENANCE 10 2 MIF Digital Feeder Protection GEK 106273L ...
Page 199: ...ANNEX 5 HARMONIC FILTERING 15 4 MIF Digital Feeder Protection GEK 106273L ...