Siemens 7SR51 - Settings Menu

Parameter: Pickup Option
•
Default setting: All
This setting defines whether pickup is initiated when an undercurrent condition is detected on Any phase
or is only initiated when an undercurrent is detected on All phases.
Parameter: Setting
•
Default setting: 0.25 x I
n
(0.25 I
rated
)
The setting to be appropriate to the respective application.
A pickup value of 10 % is a practicable value for fault indications of electrical machines.
Parameter: Delay
•
Default setting: 0 s
No specific recommendation is given: The setting to be appropriate to the respective application.
Parameter: UC Guard Inhibit
•
Default setting: Yes
Current elements can be blocked if all phase currents fall below setting.
Settings Menu
Functions > Function Config
Parameter Range Settings
Default Gn1 Gn2 Gn3 Gn4
37 Undercurrent Enabled
Disabled
Disabled
Functions > Protection > 37 > Gn 37 Common
Parameter Range Settings
Default Gn1 Gn2 Gn3 Gn4
UC Guard Setting 0.05 to 5 I
rated
, Δ 0.05 I
rated
0.1 ⋅
I
rated
Functions > Protection > 37 > Gn 37-n
Parameter Range Settings
Default Gn1 Gn2 Gn3 Gn4
Element Enabled
Disabled
Disabled
Setting 0.05 to 5 I
rated
, Δ 0.05 I
rated
0.25 ⋅
I
rated
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
1 s
UC Guard Inhibit Yes
No
Yes
5.5.5
Protection and Automation Functions
5.5 37 Undercurrent Protection – Phase
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 175
C53000-G7040-C014-1, Edition 11.2019