Line differential protection RED670
Version 2.2
Inverse characteristic
Table 215. ANSI Inverse time characteristics
Function
Operating characteristic:
æ
ö
A
ç
÷
=
+
×
t
B k
(
)
ç
÷
-
P
I
1
è
ø
EQUATION1249-SMALL V3 EN-US
Reset characteristic:
t r
=
×
t
k
(
)
2
-
I
1
EQUATION1250-SMALL V1 EN-US
I = I
/I
measured
set
ANSI Extremely Inverse
ANSI Very inverse
ANSI Normal Inverse
ANSI Moderately Inverse
Long Time Extremely Inverse
Long Time Very Inverse
Long Time Inverse
Table 216. ANSI Inverse time characteristics for Line differential protection
Function
Operating characteristic:
æ
ö
A
ç
÷
=
+
×
t
B k
(
)
ç
÷
-
P
I
1
è
ø
EQUATION1249-SMALL V3 EN-US
Reset characteristic:
t r
=
×
t
k
(
)
2
-
I
1
EQUATION1250-SMALL V1 EN-US
I = I
/I
measured
set
ANSI Extremely Inverse
ANSI Very inverse
ANSI Normal Inverse
ANSI Moderately Inverse
Long Time Extremely Inverse
Long Time Very Inverse
Long Time Inverse
Hitachi Energy
M12388-1 v24
Range or value
0.05 ≤ k ≤ 999.00
1.5 x I
≤ I ≤ 20 x I
set
set
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
Range or value
0.05 ≤ k ≤ 1.10
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
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 505 379-BEN R
Accuracy
ANSI/IEEE C37.112 ,
±2.0% or ±40 ms
whichever is greater
Accuracy
ANSI/IEEE C37.112 ,
±5.0% or ±40 ms
whichever is greater
157