ABB REG670 Technical Manual page 1265

1MRK502052-UEN B
Technical manual
Table 967: RI and RD type inverse time characteristics for Sensitive directional residual
overcurrent and power protection
Function
RI type inverse characteristic
1
= ×
t k
0.236
-
0.339
I
EQUATION1137-SMALL V1 EN
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
I = I /I
measured set
Table 968: ANSI Inverse time characteristics for Voltage restrained time overcurrent protection
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
Inverse time characteristics
Range or value
0.10 ≤ k ≤ 2.00
1.5 x I ≤ I ≤ 20 x I
set set
Range or value
0.10 ≤ k ≤ 3.00
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
Section 25
Accuracy
IEC 60255-151, ±5.0%
or ±160 ms whichever is
greater
Accuracy
ANSI/IEEE C37.112 ,
± 5.0% or ±40 ms
whichever is greater
1259