ABB RET670 Product Manual page 85

ABB
Transformer protection RET670
Pre-configured
Product version: 1.1
Table 90. 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
Time delay to reset, IEC inverse
time
IEC Normal Inverse
IEC Very inverse
IEC Inverse
IEC Extremely inverse
IEC Short time inverse
IEC Long time inverse
Programmable characteristic
Operate characteristic:
æ ö
A
ç ÷
= + ×
t B k
( )
ç ÷
P
-
è ø
I C
EQUATION1370-SMALL V1 EN
Reset characteristic:
TR
= ×
t k
( )
PR
-
I CR
EQUATION1253-SMALL V1 EN
I = I /I
measured set
Range or value
k = (0.05-999) in steps of 0.01
(0.000-60.000) s
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
k = (0.05-999) 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
1MRK 504 091-BEN B
Issued: June 2010
Accuracy
-
± 0.5% of set time ±
10 ms
IEC 60255-3, class 5
+ 40 ms
IEC 60255, class 5 +
40 ms
85