ABB 1MRK002826-AG - Page 134

Table 186. IEC Inverse time characteristics for Sensitive directional residual overcurrent and power protection
Function Range or value Accuracy
Operating characteristic:
( )
1
= ×
-
æ ö
ç ÷
ç ÷
è ø
P
A
t k
I
EQUATION1251-SMALL V1 EN-US
I = I
measured
/I
set
0.05 ≤ k ≤ 2.00
1.5 x I
set
≤ I ≤ 20 x I
set
IEC 60255-151, ±5.0%
or ±160 ms whichever
is greater
IEC Normal Inverse A=0.14, P=0.02
IEC Very inverse A=13.5, P=1.0
IEC Inverse A=0.14, P=0.02
IEC Extremely inverse A=80.0, P=2.0
IEC Short time inverse A=0.05, P=0.04
IEC Long time inverse A=120, P=1.0
Programmable characteristic
Operate characteristic:
( )
= + ×
-
æ ö
ç ÷
ç ÷
è ø
P
A
t B k
I C
EQUATION1370-SMALL V1 EN-US
Reset characteristic:
( )
= ×
-
PR
TR
t k
I CR
EQUATION1253-SMALL V1 EN-US
I = I
measured
/I
set
k = (0.05-2.00) 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
Table 187. RI and RD type inverse time characteristics for Sensitive directional residual overcurrent and power protection
Function
Range or value Accuracy
RI type inverse characteristic
1
0.236
0.339
= ×
-
t k
I
EQUATION1137-SMALL V1 EN-US
I = I
measured
/I
set
0.05 ≤ k ≤ 2.00
1.5 x I
set
≤ I ≤ 20 x I
set
IEC 60255-151, ±5.0%
or ±160 ms whichever
is greater
RD type logarithmic inverse
characteristic
5.8 1.35= - ×
æ ö
ç ÷
è ø
t
I
In
k
EQUATION1138-SMALL V1 EN-US
I = I
measured
/I
set
Generator protection REG670
1MRK 502 074-BEN M
Version 2.2
134 Hitachi Power Grids
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