Siemens 7SG11 Manual page 97

Sub-menu: O/P Relay Config.
Setting name
Gn Lockout Alarm
Gn Close Pulse
Gn AUX Close
Gn ARC Active
Gn Reclaimed
Sub-menu: Status Config.
Setting name
Gn CB Open
Gn CB Closed
Gn Reclose Block
Gn P/F ARC Off
Gn E/F ARC Off
Gn SEF/REF ARC Off
2.9.1.2 External Protection Reclose Sequence
In addition to the relay's internal protection and auto-reclose sequences a programmable auto-reclose sequence
and back-up protection functions for an external protection is provided.
The external protection trip is sensed on a status input, as set in the Status Config.:ARC Status A setting. This will
typically be energised from the trip output, or starter output, of an external protection device e.g. a distance
protection or sensitive earth-fault relay. The Argus 4/6 will then provide a separate auto-reclose sequence, with
the external protection providing the fault detection and tripping functions. Up to four close shots (five trips) to
lockout may be set with independent reclose delays.
The Auto-reclose:SA Trips to Block setting causes an output to be raised after a set number of trips in a sequence as
set in the O/P Relay Config.:SA Blocked setting. This is intended to allow blocking of the external protection. For
example, the Argus can provide the auto-reclose sequences and back-up IDMT protection to a distance
protection. The distance relay could be allowed to trip twice, it can then be blocked and the IDMT protection of the
Argus allowed to grade with other inverse protection relays to clear the fault.
Back-up protection is also provided by timers, as set by the O/P Relay Config.:Backup Alarm SA and O/P Relay
Config.:Backup Trip SA settings, which run consecutively. When ARC Status A is raised, the Backup Alarm timer
starts running, on time-out a SA Alarm is given and the Backup Trip timer then starts running, on its time-out the
relay gives a SA Trip output. Both timers stop & reset when ARC Status A is cleared. This two stage back-up
protection, therefore, has the external protection settings, e.g. Impedance or SEF levels. The timers provide a
protection trip when the SA sequence has progressed to the point at which the external protection is blocked and
the fault level falls below the overcurrent protection settings. For example; a five pole protection scheme can be
engineered, with a 3P + E Argus 4 relay and a separate SEF relay, where the P/F, E/F, and SEF protection each
have independent auto-reclose sequences.
Outputs from the alarm and trip are set using the O/P Relay Config.:SA Alarm and O/P Relay Config.:SA Trip settings.
All other settings relating to this function are as for the internal sequences described above, with the exception of
line check trip. When the Auto-reclose:SA Line Check Trip setting is set to Delayed, the delay used is that given by the
two stage back-up alarm and back-up trip times.
Table 2-20 Auto-reclose from External Trip Settings
Sub-menu: Protection
Setting name
Gn Backup Alarm SA
Gn Backup Trip SA
©2013 Siemens Protection Devices Limited
Range (bold = default)
_ or 1 for each output contact
(default: _ _ _ _ _ _ 1)
_ or 1 for each output contact
(default: _ _ _ 1 _ _ _)
_ or 1 for each output contact
(default: _ _ _ _ _ _ _)
Range (bold = default)
_ or 1 for each status input
(default: _ _ _ _ _ 1 _ _ _)
_ or 1 for each status input
(default: _ _ _ _ _ _ 1 _ _)
_ or 1 for each status input
(default: _ _ _ _ _ _ _ _ _)
Range (bold = default)
0.00, 0.01...10.00...20.00
0.00, 0.01...10.00...20.00
7SG11 Argus Technical Reference
Notes
Default output = relay 7
Default output = relay 4
Default output = None
Notes
Default input = 6
Default input = 7
Default input = None
Units Notes
sec
sec
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