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Chapter 6. Description of Operation of Protection Subsystem
6-13
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
6.6
Recloser (7IRD-A/J Models)
The Recloser function in the
7IRD
IEDs is designed to initiate up to four reclose attempts with
independent settings of the Recloser and security times.
Independent Recloser Timer settings are available for each dead time interval for both phase
and ground faults. The types of controlled Recloser signals are:
-
Recloser starts for phase-to-ground faults tripped by the ground time unit.
-
Recloser starts for phase-to-ground faults tripped by the ground instantaneous unit.
-
Recloser starts for phase-to-phase faults tripped by the time units (Phase Time).
-
Recloser starts for phase-to-phase faults tripped by the instantaneous units (Phase
Instantaneous).
-
Recloser starts for open phase unit trip.
-
Recloser starts for residual current unit trip.
-
Recloser starts for external protection unit trip.
Following figures show flow diagrams describing the operation of the Recloser. Reclose Initiate
(
IR
) signal shown in these diagrams is the logic sum of the following signals:
IR-F (Recloser starts for phase-to-phase faults)
IR-N (Recloser starts for phase-to-ground faults)
Therefore
IR = IR-F + IR-N
IR
is activated when either
IR-P
or
IR-N
is initiated.
IR
is reset when both
IR-P
and
IR-N
are
reset.
6.6.1
Reclose Sequence
Up to four reclose attempts can be programmed in the reclose sequence. A sequence of
operations takes place during each of these close attempts that is controlled by the Recloser
settings, external inputs, and inputs from the protection elements.
Reclose Initiate
When the Recloser function is in the Recloser Reset state, reclosing can be initiated by internal
protection elements or an
External Protection Trip Input
(
APE
). When the
Reclose Initiate
(
IR
) signal is activated, the Recloser switches from the
Reset
state to the
Sequence Check
Time
state. The
Sequence Check Time
timer begins timing at this point. If this timing is
completed before the fault is cleared (
IR
de-activated) and the breaker opens (
IA
), the Recloser
switches to
Recloser Lockout Due To Breaker Failure
. Manually closing the breaker will reset
the Recloser provided the breaker remains closed for the Recloser
Reset Time after Manual
Close
set by the user. If the fault has been successfully cleared, the reclose sequence
continues with the activation of the
Reclose Sequence in Progress
(
CC
) signal.
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Страница 175: ...D List of Illustrations and Tables...