Hitachi Relion 670 Series Product Manual page 164

Line differential protection RED670
Version 2.2
Table 227. ANSI Inverse time characteristics for Voltage restrained time overcurrent 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
Table 228. IEC Inverse time characteristics for Voltage restrained time overcurrent protection
Function
Operating characteristic:
æ ö
A
ç ÷
= ×
t k
( )
ç ÷
P
è - ø
I 1
EQUATION1251-SMALL V1 EN-US
I = I /I
measured set
IEC Normal Inverse
IEC Very inverse
IEC Inverse
IEC Extremely inverse
IEC Short time inverse
IEC Long time inverse
164
GUID-2AE8C92E-5DA8-487F-927D-8E553EE29240 v3
Range or value
0.05 ≤ k ≤ 999.00
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 ≤ 999.00
A=0.14, P=0.02
A=13.5, P=1.0
A=0.14, P=0.02
A=80.0, P=2.0
A=0.05, P=0.04
A=120, P=1.0
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1MRK 505 379-BEN R
Accuracy
ANSI/IEEE C37.112 , ±
5.0% or ±40 ms
whichever is greater
Accuracy
IEC 60255-151, ±5.0%
or ±40 ms whichever is
greater
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