Settings Menu - Siemens 7SR51 Device Manual

Protection and Automation Functions
5.3 27Vx Undervoltage Protection – Vx
•
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
27Vx Common
27Vx-1
27Vx-1
27Vx-1
27Vx-1
27Vx-1
27Vx-2
27Vx-2
27Vx-2
27Vx-2
27Vx-2
5.3.5

Settings Menu

Functions > Function Config
Parameter
27Vx Undervoltage
Functions > Protection > 27Vx > Gn 27Vx Common
Parameter
UV Guard Setting
Functions > Protection > 27Vx > Gn 27Vx-n
Parameter
Element
Setting
Hysteresis
Delay
UV Guard Inhibit
160
UV Guard Setting
Element
Setting
Hysteresis
Delay
UV Guarded
Element
Setting
Hysteresis
Delay
UV Guarded
Range
Enabled
Disabled
Range
1 to 200 V, Δ 0.5 V
Range
Enabled
Disabled
5 to 200 V, Δ 0.5 V
0 to 80 %, Δ 0.1 %
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
No
Yes
Setting Values
5 V
Enabled
99 V
3 %
3 s
Yes
Enabled
77 V
3 %
1 s
Yes
Settings
Default Gn1 Gn2
Disabled
Settings
Default Gn1 Gn2
5 V
Settings
Default Gn1 Gn2
Disabled
80 V
3 %
0.1 s
Yes
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
Gn3 Gn4
Gn3 Gn4
Gn3 Gn4