•
Immunity to VT Fail
Both of these elements will be affected by VT failure if these settings are applied but a 3 phase VT fail
which would be required to affect the first stage may be less likely. In many cases it is preferable to
inhibit the voltage protection.
•
Any/All phases
The voltage control will operate on all 3 phases and the failure will result in voltage reduction on all 3
phases. The first stage should be set to operate on
All
phases. The second stage must operate for under-
voltage on
Any
phase.
Element
Setting Values
27Vx Common
UV Guard Setting
5 V
27Vx-1
Element
Enabled
27Vx-1
Setting
99 V
27Vx-1
Hysteresis
3 %
27Vx-1
Delay
3 s
27Vx-1
UV Guarded
Yes
27Vx-2
Element
Enabled
27Vx-2
Setting
77 V
27Vx-2
Hysteresis
3 %
27Vx-2
Delay
1 s
27Vx-2
UV Guarded
Yes
Settings Menu
Functions > Function Config
Parameter
Range
Settings
Default Gn1
Gn2
Gn3
Gn4
27Vx Undervoltage
Enabled
Disabled
Disabled
Functions > Protection > 27Vx > Gn 27Vx Common
Parameter
Range
Settings
Default Gn1
Gn2
Gn3
Gn4
UV Guard Setting
1 to 200 V, Δ 0.5 V
5 V
Functions > Protection > 27Vx > Gn 27Vx-n
Parameter
Range
Settings
Default Gn1
Gn2
Gn3
Gn4
Element
Enabled
Disabled
Disabled
Setting
5 to 200 V, Δ 0.5 V
80 V
Hysteresis
0 to 80 %, Δ 0.1 %
3 %
Delay
0 to 20 s Δ 0.01 s
20 to 100 s Δ 0.1 s
100 to 1000 s Δ 1 s
1000 to 10000 s Δ 10 s
10000 to 14400 s Δ 100 s
0.1 s
UV Guard Inhibit
No
Yes
Yes
5.4.5
Protection and Automation Functions
5.4 27Vx Undervoltage Protection – Vx
168
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
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