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Table 66. IEC Inverse time characteristics
Function
Range or value
Accuracy
Operating characteristic:
(
)
1
=
×
-
æ
ö
ç
÷
ç
÷
è
ø
P
A
t
k
I
EQUATION1251-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-999) in steps of 0.01
-
IEC Normal Inverse
A=0.14, P=0.02
IEC 60255-151,
class 5 + 40 ms
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
Table 67. RI and RD type inverse time characteristics
Function
Range or value
Accuracy
RI type inverse characteristic
1
0.236
0.339
=
×
-
t
k
I
EQUATION1137-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-999) in steps of 0.01
IEC 60255-151,
class 5 + 40 ms
RD type logarithmic inverse
characteristic
5.8
1.35
=
-
×
æ
ö
ç
÷
è
ø
t
I
In
k
EQUATION1138-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-999) in steps of 0.01
IEC 60255-151,
class 5 + 40 ms
Bay control REC650
1MRK 511 249-BEN -
Product version: 1.1
Issued: February 2011
72
ABB
Summary of Contents for REC650 ANSI
Page 1: ...Relion 650 series Bay control REC650 Product Guide...
Page 81: ...81...