7SR210 & 7SR220 Description of Operation
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©2018 Siemens Protection Devices Limited
4.2
Autoreclose Prot’n Menu
This menu presents the Overcurrent Protection elements available for each type of Fault i.e. P/F, E/F or SEF and
allows the user to select those that are to be applied as
Inst trips
; those that are to be applied as
Delayed Trips
;
and those that are to be applied as
HS Trips
(HighSet), as required by the selected sequence. There is no
corresponding setting for External as the External protection type is not normally controlled by the Auto Reclose
Relay. The resultant configuration enables the Auto Reclose function to correctly apply the required Protection for
each shot in a sequence.
4.3
Autoreclose Config Menu
This menu allows the following settings to be made:-
79 Autoreclose
Enabled
turns ON all AutoReclose Functions.
79 Num Shots
Sets the allowed number of AutoReclose attempts in a sequence.
79 Retry Enable
Enabled
configures the relay to perform further attempts to automatically Close the
Circuit Breaker where the CB has initially failed to close in response to a Close
command. If the first attempt fails the relay will wait for the
79 Retry Interval
to expire
then attempt to Close the CB again.
79 Retry Attempts
Sets the maximum number of retry attempts.
79 Retry Interval
Sets the time delay between retry attempts.
79 Reclose Blocked Delay
If the CB is not ready to receive a Close command or if system conditions are such
that the CB should not be closed immediately e.g. a close-spring is not charged, then
a Binary input mapped to
Reclose Block
can be raised and the Close pulse will not be
issued but will be held-back. The
79 Reclose Blocked Delay
sets the time
Reclose
Block
is allowed to be raised, if this time delay expires the Relay will go to Lockout. If
Reclose Block is cleared, before this time expires, then the CB Close pulse will be
issued at that point in time. Dead Time + Reclose Blocked Delay = Lockout.
79 Sequence Fail Timer
Sets the time that AutoReclose start can be primed. Where this time expires before all
the DAR start signals are not received i.e. the CB has opened, protection pickups have
reset and the trip relay has reset, the Relay goes to Lockout.
79 Minimum LO Delay
Sets the time that the Relay’s Lockout condition is maintained. After the last allowed
Trip operation in a specific sequence the Circuit Breaker will be left locked-out in the
open position and can only be closed by manual or remote SCADA operation. The
79
Minimum Lockout Delay
timer can be set to delay a too-fast manual close after
lockout, this prevents an operator from manually closing onto the same fault too
quickly and thus performing multiple sequences and possibly burning-out Plant.
79 Reset LO by Timer
Set to
Enabled
this ensures that the Lockout condition is reset when the timer expires,
Lockout indication will be cleared; otherwise, set to Disabled, the Lockout condition will
be maintained until the CB is Closed by a Close command.
79 Sequence Co-Ord
When set to
Enabled
the Relay will co-ordinate its sequence and shot count such that
it automatically keeps in step with downstream devices as they advance through their
sequence. The Relay detects that a pickup has operated followed by current switch-
off. It then increments its Shot count and advances to the next stage of the auto-
reclose sequence without issuing a trip. This is repeated as long as the fault is being
cleared by the downstream device such that the Relay moves through the sequence
bypassing the INST Trips and moving on to the Delayed Trip to maintain Grading
margins.
Summary of Contents for Argus 7SR21
Page 1: ...Energy Management 7SR21 7SR22 Argus Overcurrent Relay Reyrolle Protection Devices ...
Page 2: ......
Page 4: ...Contents 7SR11 and 7SR12 Page 2 of 2 2018 Siemens Protection Devices Limited ...
Page 185: ...7SR210 Settings Guide Unrestricted 2018 Siemens Protection Devices Limited Page 61 of 61 ...
Page 277: ...7SR220 Settings Guide Unrestricted Page 72 of 107 2013 Siemens Protection Devices Limited ...
Page 382: ...7SR220 Technical Manual Chapter 4 Page 2 of 96 2017 Siemens Protection Devices Limited ...
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