ABB RES670 Technical Manual page 899

1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Table 694: IEC Inverse time characteristics for Voltage restrained time overcurrent protection
Function
Operating characteristic:
æ ö
A
ç ÷
= ×
t td
( )
ç ÷
P
è - ø
I 1
EQUATION1653 V1 EN-US
I = I /I
measured set
IEC Normal Inverse
IEC Very inverse
IEC Inverse
IEC Extremely inverse
IEC Short time inverse
IEC Long time inverse
Inverse time characteristics
Range or value
td = (0.05-2.00) 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
Section 26
Accuracy
IEC 60255-151, ±5.0%
or ±40 ms whichever is
greater
893