Hitachi Relion 670 Series Product Manual page 161

Line differential protection RED670
Version 2.2
Table 222. IEC Inverse time characteristics for Line Differential 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
Programmable characteristic
Operate characteristic:
æ ö
A
ç ÷
= + ×
t B k
( )
ç ÷
P
è - ø
I C
EQUATION1370-SMALL V1 EN-US
Reset characteristic:
TR
= ×
t k
( )
PR
-
I CR
EQUATION1253-SMALL V1 EN-US
I = I /I
measured set
The parameter setting Characterist1 and 4/
Reserved shall not be used, since this
parameter setting is for future use and not
implemented yet.
Table 223. RI and RD type inverse time characteristics for Line Differential protection
Function
RI type inverse characteristic
1
= ×
t k
0.236
-
0.339
I
EQUATION1137-SMALL V1 EN-US
I = I /I
measured set
RD type logarithmic inverse characteristic
æ ö
I
- ç × ÷
= 5.8 1.35 In
t
è ø
k
EQUATION1138-SMALL V1 EN-US
I = I /I
measured set
Hitachi Energy
Range or value
k = (0.05-2.00) in steps of 0.01
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
k = (0.05-999) in steps of 0.01
A=(0.005-200.000) in steps of 0.001
B=(0.00-20.00) in steps of 0.01
C=(0.1-10.0) in steps of 0.1
P=(0.005-3.000) in steps of 0.001
TR=(0.005-100.000) in steps of 0.001
CR=(0.1-10.0) in steps of 0.1
PR=(0.005-3.000) in steps of 0.001
Range or value
k = (0.05-2.00) in steps of 0.01
k = (0.05-999) in steps of 0.01
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1MRK 505 379-BEN R
Accuracy
IEC 60255-151, ± 5.0%
or ± 40 ms whichever is
greater
Accuracy
IEC 60255-151, ± 5.0%
or ± 40 ms whichever is
greater
161