ABB Relion REQ650, Product Manual

Page: 81 / 91

Table 70. IEC Inverse time characteristics
Function Range or value Accuracy
Operating characteristic:
( )
= ×
-
æ ö
ç ÷
ç ÷
è ø 1
P
A
t td
I
EQUATION1653 V1 EN
I = I
measured
/I
set
td = (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 71. RI and RD type inverse time characteristics
Function Range or value Accuracy
RI type inverse characteristic
= ×
-
1
0.236
0.339
t td
I
EQUATION1656 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01 IEC 60255-151,
class 5 + 40 ms
RD type logarithmic inverse
characteristic
=
- ×
æ ö
ç ÷
è ø
5.8 1.35
t
I
In
td
EQUATION1657 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01 IEC 60255-151,
class 5 + 40 ms
Breaker protection REQ650 ANSI 1MRK 505 269-BUS -
Product version: 1.1 Issued: April 2011
ABB 81