ABB Relion 650 series RET650 Product Manual page 70

Transformer protection RET650
Product version: 1.1
Table 62. IEC Inverse time characteristics
Function
Operating characteristic:
æ ö
A
ç ÷
= ×
t k
( )
ç ÷
P
è - ø
I 1
EQUATION1251-SMALL V1 EN
I = I /I
measured set
IEC Normal Inverse
IEC Very inverse
IEC Inverse
IEC Extremely inverse
IEC Short time inverse
IEC Long time inverse
Table 63. RI and RD type inverse time characteristics
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
70
Range or value
k = (0.05-999) 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
Range or value
k = (0.05-999) in steps of 0.01
k = (0.05-999) in steps of 0.01
1MRK 504 127-BEN -
Issued: February 2011
Accuracy
-
IEC 60255-151,
class 5 + 40 ms
Accuracy
IEC 60255-151,
class 5 + 40 ms
IEC 60255-151,
class 5 + 40 ms
ABB