Circuit Breaker; Figure 4.10-1 Voltage Detector Operation - Siemens Argus 7SR21 Technical Manual

7SR210 & 7SR220 Description of Operation

Figure 4.10-1 Voltage Detector Operation

Live and Dead outputs are provided for each voltage input:
A Live, B Live, C Live, A Dead, B Dead, C Dead, X Live, Y Live, Z Live, X Dead, Y Dead & Z Dead,
Combined outputs are also provided separately to indicate ALL phases Live or Dead:
ABC Live, ABC Dead, XYZ Live & XYZ Dead

4.11 Circuit Breaker

This menu includes relay settings applicable to both manual close (MC) and auto-reclose (AR) functionality.
CB Controls Latched
CB controls for closing and tripping can be latched i.e. until confirmation that the action has been completed i.e.
binary input is edge triggered when latched.
Close CB Delay
The Close CB Delay is applicable to manual CB close commands received through a Close CB binary input or
via the Control Menu. Operation of the Manual Close CB binary output is delayed by the Close CB Delay
setting.
NB: During the close countdown period the operation can be terminated by pressing 'Cancel' on the fascia.
Close CB Pulse
The duration of the CB Close Pulse is settable to allow a range of CBs to be used. The Close pulse will be
terminated if any protection pick-up operates or a trip occurs. This is to prevent Close and Trip Command pulses
existing simultaneously. A 79 Close On Fault Output is given if a pick-up or trip operates during the Close Pulse.
This can be independently wired to Lockout.
'CB Failed To Open' and 'CB Failed to Close' features are used to confirm that a CB has not responded correctly
to each Trip and Close Command. If a CB fails to operate, the AR feature will go to lockout.
'79 CB Close Fail' is issued if the CB is not closed at the end of the close pulse, CB Close Pulse.
Reclaim Timer
The 'Reclaim time' will start each time a Close Pulse has timed out and the CB has closed.
Where a protection pickup is raised during the reclaim time the relay advances to the next part of the reclose
sequence.
The relay goes to the Lockout state if the CB is open at the end of the reclaim time or a protection operates during
the final reclaim time.
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