Auto-Reclose - Siemens 7SG11 Manual

V Inhibit
Va / Vab
Vb / Vbc
Vc / Vca
V Block Threshold
Figure 2.8-1
Table 2-18 Voltage Protection Settings
Sub-menu: Voltage
Setting name
Gn V Operation
Gn V Setting (Ph-N)
Gn V Setting (Ph-Ph)
Gn V Delay
Gn V Hysteresis
Gn V Block Threshold
Gn V O/P Phases
Sub-menu: O/P Relay Config.
Setting name
Gn V Starter
Gn V Trip
Gn V Block Alarm
Sub-menu: Status Config.
Setting name
Gn V Inhibit
2.9

Auto-Reclose

Argus 4 and Argus 6 only.
Approximately 90% of all overhead line faults are transient (non–damage) arcing Phase(s) to Earth faults induced
by lightning or due to other transient initiation. Use of a sequence of Instantaneous (Lowset) trips followed by
Delayed trips e.g. 2I + 1D with line Dead-Times (Reclose Delays) ensures that such transient faults are cleared
quickly before consequential permanent damage to the plant can occur and hence, after the line has been dead
for a short time (1 – 5 s) to allow arc by-products and ionised air to disperse, the healthy line can be reclosed and
©2013 Siemens Protection Devices Limited
V Operation
V Setting
V Hysteresis
c
c
Va/Vab starter
> <
or
Event
Vb/Vbc starter
> <
or
Event
Vc/Vca starter
> <
or
Event
<
&
<
<
Functional Diagram – Undervoltage/Overvoltage Element
Range (bold = default)
OFF, O/V, U/V
5.0, 5.5...80.0...200.0
0.00, 0.01...20,20.5...
100.0,101.0...600.0
1,2...90
OFF,1,2...5...100
Any One, All
Range (bold = default)
_, 1 for each output contact
(default: _ _ _ _ _ _ _ _ _ _ _)
Range (bold = default)
_, 1 for each status input
(default: _ _ _ _ _ _ _ _ _)
7SG11 Argus Technical Reference
V starter
Event
V O/P Phases V Delay
1 &
or
Block P/F A
Block P/F B
Block P/F C
Voltage Block
Event
Units Notes
Setting indicates whether phase-
V
phase or phase-neutral is in use –
set by System Config.:VT Connection
sec
%
V
Units Notes
Units Notes
V Starter
V Trip
Event
V trip
V Block Alarm
P300008 Protection Functions / V
P20007 Page 37 of 71