
ADR141A /
ADR241A
Doc ID : ADR241A_IM_01
Ref ID : ADR241A/IM/PLF
Rev No. : 02
Page No. :
60
of 150
For IEC Inverse Curve
t =
K* a
I
I
ref
b
–
1
For Extremely Inverse C4A Curve as per EE relays
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
Define Time
-
-
Содержание ADR141A
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