GEK-106237P MIFII Digital Feeder Relay 2-5
2 PRODUCT DESCRIPTION 2.4 OVERCURRENT ELEMENTS
2
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
pickup setting
> 1.05
2.4.1.4 USER CURVES
The general formula for the user curve is as follows:
Where:
D =Time Dial setting (set in the relay by user).
V =I / I
pickup setting
> 1.05
I =Input Current
T =Operate Time (sec.)
A, P, Q, B, K =Constants defined in the standard, as follows:
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.
PARAMETERS A B P O K
Range 0 – 125 0-3 0-3 0-2 0-1.999
Step 0.001 0.001 0.001 0.001 0.001
Unit Sec. Sec. NA NA Sec.
Default value 0.05 0 0.04 1 0
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