ABB Relion 650 Series Product Manual page 53

Transformer protection RET650
Version 1.1 ANSI
Table 64. Inverse time characteristics for overvoltage protection
Function
Type A curve:
td
=
t
æ ö
-
V VPickup
ç ÷
è ø
VPickup
EQUATION1661 V1 EN-US
V = V
measured
Type B curve:
×
td 480
=
t
æ
-
V VPickup
ç × -
32 0.5
è
VPickup
EQUATION1662 V1 EN-US
Type C curve:
×
td 480
=
t
æ
-
V VPickup
× -
ç
32 0.5
è
VPickup
EQUATION1663 V1 EN-US
Table 65. Inverse time characteristics for undervoltage protection
Function
Type A curve:
td
=
t
æ ö
-
VPickup V
ç ÷
è ø
VPickup
EQUATION1658 V1 EN-US
V = V
measured
Type B curve:
×
td 480
=
t
æ
-
VPickup V
× -
ç
32 0.5
è
VPickup
EQUATION1659 V1 EN-US
V = V
measured
ABB Power Grids
Range or value
td = (0.05-1.10) in steps of 0.01 unless otherwise stated
td = (0.05-1.10) in steps of 0.01 unless otherwise stated
2.0
ö
÷ -
0.035
ø
td = (0.05-1.10) in steps of 0.01 unless otherwise stated
3.0
ö
-
÷
0.035
ø
Range or value
td = (0.05-1.10) in steps of 0.01 unless otherwise stated
td = (0.05-1.10) in steps of 0.01 unless otherwise stated
+
0.055
2.0
ö
÷
ø
© Copyright 2011 ABB Power Grids. All rights reserved
SEMOD116978-2 v4
1MRK 504 127-BUS B
Accuracy
Class 5 +40 ms
Accuracy
Class 5 +40 ms
53