Table 575:
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
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01
RD type logarithmic inverse characteristic
=
-
×
æ
ö
ç
÷
è
ø
5.8
1.35
t
I
In
td
EQUATION1657 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01
Table 576:
Inverse time characteristics for overvoltage protection
Function
Range or value
Accuracy
Type A curve:
=
-
æ
ö
ç
÷
è
ø
t
td
V
VPickup
VPickup
EQUATION1661 V1 EN
V = V
measured
td = (0.05-1.10) in steps of
0.01
±5% +60 ms
Type B curve:
=
×
-
×
-
-
æ
ö
ç
÷
è
ø
2.0
480
32
0.5
0.035
t
td
V
VPickup
VPickup
EQUATION1662 V1 EN
td = (0.05-1.10) in steps of
0.01
Type C curve:
=
×
-
×
-
-
æ
ö
ç
÷
è
ø
3.0
480
32
0.5
0.035
t
td
V
VPickup
VPickup
EQUATION1663 V1 EN
td = (0.05-1.10) in steps of
0.01
1MRK 511 287-UUS A
Section 19
Time inverse characteristics
663
Technical manual
Summary of Contents for REC650 ANSI
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