Table 1081:RI and RD type inverse time characteristics for Sensitive directional residual overcurrent and power
protection
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
0.05 ≤ k ≤ 2.00
1.5 x I
set
≤ I ≤ 20 x I
set
IEC 60255-151, ±5.0%
or ±160 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
GUID-2AE8C92E-5DA8-487F-927D-8E553EE29240 v2
Table 1082:ANSI 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
B
td
I
EQUATION1651 V1 EN-US
Reset characteristic:
( )
=
×
-
2
1
tr
t
td
I
EQUATION1652 V1 EN-US
I = I
measured
/I
set
td = (0.05-999.00) in steps of 0.01
ANSI/IEEE C37.112 , ±
5.0% 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 502 066-UUS B
Inverse time characteristics
1392
Technical manual
Содержание Relion 670 series
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