definite time delay. Thus, if only the inverse time delay is required, it is
important to set the definite time delay for that stage to zero.
26.3
Inverse characteristics
IP15797-1 v2
M12388-1 v21
Table 687:
ANSI Inverse time characteristics
Function
Range or value
Accuracy
Operating characteristic:
(
)
=
+
×
-
æ
ö
ç
÷
ç
÷
è
ø
1
P
A
t
B
td
I
EQUATION1651 V1 EN-US
Reset characteristic:
( )
=
×
-
2
1
tr
t
td
I
EQUATION1652 V1 EN-US
I = I
measured
/I
set
0.10 ≤ td ≤ 3.00
1.5 x I
set
≤ I ≤ 20 x I
set
ANSI/IEEE C37.112 ,
±2.0% or ±40 ms
whichever is greater
ANSI Extremely Inverse
A=28.2, B=0.1217, P=2.0 , tr=29.1
ANSI Very inverse
A=19.61, B=0.491, P=2.0 , tr=21.6
ANSI Normal Inverse
A=0.0086, B=0.0185, P=0.02,
tr=0.46
ANSI Moderately Inverse
A=0.0515, B=0.1140, P=0.02,
tr=4.85
ANSI Long Time Extremely Inverse
A=64.07, B=0.250, P=2.0, tr=30
ANSI Long Time Very Inverse
A=28.55, B=0.712, P=2.0, tr=13.46
ANSI Long Time Inverse
A=0.086, B=0.185, P=0.02, tr=4.6
Section 26
1MRK 511 408-UUS A
Inverse time characteristics
888
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Summary of Contents for Relion RES670
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