RFL Electronics GARD 8000, Инструкция по эксплуатации

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Description of Operation
GARD 8000 Distance Relay RFL Electronics Inc.
The Sync Check Supervision setting may be adjusted independently for each recloser cycle. If the Sync
Check Supervision setting for the corresponding cycle is set to NO, the Reclose Command signal
(Recl) is generated and the Fail to Close (inhibit) timer is started. In case the breaker does not close
during the set time, further reclosing is blocked.
If the Sync Check Supervision setting for the corresponding cycle is set to YES, the next step is to
check the Sync signal, which indicates the presence of synchronous conditions. If this signal is
activated, the Reclose Command signal (Recl) is generated and the Fail to close timer is started.
When synchronous conditions are not reached (Sync deactivated), the Sync Wait Timer Enable setting
is checked. If this setting is set to NO, the recloser changes to the Lock-out Due to Lack of
Synchronism state. If the setting is set to YES, the Sync Wait Timer starts to count down the adjusted
time.
Activation of the Sync signal before timeout generates activation of the Reclose Command signal
(Recl), and the Fail to Close timer is started. If the Sync signal is not activated before timeout, the
recloser changes to Lock-out Due to Lack of Synchronism state.
9.23.5 FAIL TO CLOSE TIME
When the recloser Fail to Close Time state is reached, the Reclose Command output (Recl) is activated
to send a close command to the breaker, and an adjustable Fail to Close Timer is started.
If the breaker closes before the Fail to Close Time is completed, the Recloser Reset Time state is
entered.
If the time is completed and the breaker remains open, the recloser state switches to Lock-out Due To
Open Breaker.
In either case, the Reclose Command output is subsequently de-activated.
9.23.6 SECURITY TIME
When the Recloser Security Time state is reached, an adjustable Security Time timer is started. This
setting is common for all the three reclosing cycles. The Security Time setting is used to determine
whether two consecutive trips correspond to the same fault that has not been successfully cleared, or to
two consecutive faults. If the Security Time is completed without a trip being initiated, the recloser
switches to the Recloser Reset state, and the reclose attempt is completed.
If a trip occurs and the Reclose Initiate signal (SIR) is activated before the Security Time is completed,
the next step in the reclose sequence is determined by the Number Of Reclose Attempts (n) setting. If a
trip occurs (SIR signal activated) after the last reclose attempt permitted by this setting, the recloser
switches to Recloser Lock-out Due To Definite Trip. At this point, the reclose sequence ends. If the
Recloser has not reached the last permitted reclose attempt, the trip signal that occurs before the
Security Time is completed will initiate a new reclose attempt.
The recloser will then switch to the Start Time state.
August 1, 2009 9-81 973.334.3100