Table 660:
Inverse time characteristics for undervoltage protection
Function
Range or value
Accuracy
Type A curve:
=
-
æ
ö
ç
÷
è
ø
td
t
VPickup V
VPickup
EQUATION1658 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
0.055
32
0.5
td
t
VPickup V
VPickup
EQUATION1659 V1 EN
V = V
measured
td = (0.05-1.10) in steps of
0.01
Table 661:
Inverse time characteristics for residual 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% +70 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
Section 21
1MRK 506 335-UUS A
Time inverse characteristics
820
Technical manual
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