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Table 688:
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-US
I = I
measured
/I
set
0.10 ≤ td ≤ 3.00
1.5 x I
set
≤ I ≤ 20 x I
set
IEC 60255-151, ±2.0%
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
Programmable characteristic
Trip characteristic:
(
)
=
+
×
-
æ
ö
ç
÷
ç
÷
è
ø
P
A
t
B
td
I
C
EQUATION1654 V1 EN-US
Reset characteristic:
(
)
=
×
-
PR
TR
t
td
I
CR
EQUATION1655 V1 EN-US
I = I
measured
/I
set
td = (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
Table 689:
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-US
I = I
measured
/I
set
0.10 ≤ td ≤ 3.00
1.5 x I
set
≤ I ≤ 20 x I
set
IEC 60255-151, ±2.0%
or ±40 ms whichever is
greater
RD type logarithmic inverse
characteristic
=
-
×
æ
ö
ç
÷
è
ø
5.8
1.35
t
I
In
td
EQUATION1657 V1 EN-US
I = I
measured
/I
set
1MRK 511 408-UUS A
Section 26
Inverse time characteristics
Phasor measurement unit RES670 2.2 ANSI
889
Technical manual
Summary of Contents for Relion RES670
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