Table 962:
ANSI Inverse time characteristics for Line Differential Protection
Function
Range or value
Accuracy
Operating characteristic:
(
)
1
P
A
t
B k tDef
I
æ
ö
ç
÷
=
+
× +
ç
÷
ç
-
÷
è
ø
EQUATION1249-SMALL V2 EN
Reset characteristic:
( )
2
1
=
×
-
tr
t
k
I
EQUATION1250-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-2.00) in steps of 0.01 ANSI/IEEE C37.112 ,
± 5.0% or ± 40 ms
whichever is greater
ANSI Extremely Inverse
A=28.2, B=0.1217, P=2.0 ,
tr=29.1
ANSI Very inverse
A=19.61, B=0.491, P=2.0 ,
tr=21.6
ANSI Normal Inverse
A=0.0086, B=0.0185, P=0.02,
tr=0.46
ANSI Moderately Inverse
A=0.0515, B=0.1140, P=0.02,
tr=4.85
ANSI Long Time Extremely Inverse
A=64.07, B=0.250, P=2.0,
tr=30
ANSI Long Time Very Inverse
A=28.55, B=0.712, P=2.0,
tr=13.46
ANSI Long Time Inverse
A=0.086, B=0.185, P=0.02,
tr=4.6
1MRK502052-UEN B
Section 25
Inverse time characteristics
1255
Technical manual
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