Doc ID : ADR111A_IM_01
Ref ID : ADR111A/IM/PLF
Rev No. : 04
Page No. :
57
of
127
ADR111A /
ADR211A
Delay parameter settings. After all the above condition are satisfied, the IED generates the
over current trip.
4.5
IDMT Characteristics
ADR111A/ ADR211A relay provides following inverse time over current characteristics
•
Normal Inverse 1 Curve (C1) for 3s
•
Normal Inverse 2 Curve (C2) for 1.3s
•
Very Inverse Curve (C3)
•
Extremely Inverse Curve (C4)
•
Extremely Inverse Curve (C4A) as per EE Relays
•
Long time Inverse Curve (C5)
•
Definite time Over current (C6)
The over current function is programmable as per IDMT characteristic based on IEC
standards. The inverse time delay is calculated with the following mathematical formula:
For IEC Inverse Curve
For Extremely Inverse C4A Curve as per EE relays
t =
K* a
I
I
ref
b
–
1
t =
K* a
I
I
ref
b
– 1
* 1.3
+ 0.22
Where
t = operation time
a = constant
I = Input current
Iref = Current threshold setting
b = Constant
K = Time multiplier setting
Curve Type Description
a
b
C1
Normal Inverse 1
0.14
0.02
C2
Normal Inverse 2
0.06
0.02
C3
Very Inverse
13.5
1
C4
Extremely inverse
80
2
C4A
Extremely Inverse
(C4A) as per EE Relays
80
2.2
C5
Long Time Inverse
120
1
C6
Definite Time
-
-
Summary of Contents for ADR111A
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