
Table 694:
IEC Inverse time characteristics for Voltage restrained time overcurrent protection
Function
Range or value
Accuracy
Operating characteristic:
(
)
=
×
-
æ
ö
ç
÷
ç
÷
è
ø
1
P
A
t
td
I
EQUATION1653 V1 EN-US
I = I
measured
/I
set
td = (0.05-2.00) in steps of 0.01
IEC 60255-151, ±5.0%
or ±40 ms whichever is
greater
IEC Normal Inverse
A=0.14, P=0.02
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
1MRK 511 408-UUS A
Section 26
Inverse time characteristics
Phasor measurement unit RES670 2.2 ANSI
893
Technical manual
Summary of Contents for Relion RES670
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