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2 PRODUCT DESCRIPTION
2.4.1.3 IAC CURVES
The general formula of IAC Curve is as follows:
Where:
TDM: Time Dial Multiplier (Set in the Relay by User)
I / I
> 1.05
pickup setting
2.4.1.4 USER CURVES
The general formula for the user curve is as follows:
Where:
=Time Dial setting (set in the relay by user).
D
=I / I
V
pickup setting
=Input Current
I
=Operate Time (sec.)
T
=Constants defined in the standard, as follows:
A, P, Q, B, K
PARAMETERS
Range
Step
Unit
Default value
Settings available for the phase time overcurrent unit allows the user to: enable/disable the unit; set the pickup value
(between 0.1 – 2.4 times the rated current in case of 1/5 A ground, or 0.005-0.12 A in case of sensitive ground) and set the
current/time operating characteristic (type and time dial).
Note: The relay will use either IEC, IAC or ANSI curves, depending on the model. Refer to Appendix B for a deeper
explanation of the curves.
GEK-106237P
> 1.05
A
B
0 – 125
0-3
0.001
0.001
Sec.
Sec.
0.05
0
MIFII Digital Feeder Relay
2.4 OVERCURRENT ELEMENTS
P
O
0-3
0-2
0.001
0.001
NA
NA
0.04
1
2
K
0-1.999
0.001
Sec.
0
2-5
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