ABB Relion 670 Series Product Manual page 103

Line differential protection
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Line differential protection RED670 2.0
Product version: 2.0
Inverse characteristic
Table 131. ANSI Inverse time characteristics
Function
Operating characteristic:
æ
ö
A
ç
÷
=
+
× +
t
B k tDef
(
)
ç
÷
P
ç
-
÷
I
1
è
ø
EQUATION1249-SMALL V2 EN
Reset characteristic:
t r
=
×
t
k
(
)
2
-
I
1
EQUATION1250-SMALL V1 EN
I = I
/I
measured
set
ANSI Extremely Inverse
ANSI Very inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
ABB
Range or value
k = (0.05-2.00) in steps of 0.01
A=28.2, B=0.1217, P=2.0 , tr=29.1
A=19.61, B=0.491, P=2.0 , tr=21.6
A=0.0086, B=0.0185, P=0.02, tr=0.46
A=0.0515, B=0.1140, P=0.02, tr=4.85
A=64.07, B=0.250, P=2.0, tr=30
A=28.55, B=0.712, P=2.0, tr=13.46
A=0.086, B=0.185, P=0.02, tr=4.6
1MRK505310-BEN C
Accuracy
ANSI/IEEE C37.112 ,
± 2.0% or ± 40 ms
whichever is greater
103

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