1. Individual event time: The individual event time counter registers the time passing if
the system frequency falls within the frequency band limits each time. It resets when
the frequency comes out of the frequency band limits and also when the
BLOCK
binary input is activated and start from zero when a new start is activated.
2. Accumulation time: The accumulation time counter registers the time passing
whenever the
BFI_3P
output is activated. It holds the registered time value even
when the
BFI_3P
signal is deactivated and continues from the registered value when
the
BFI_3P
signal is reactivated.
The registration of accumulation time is frozen at its present value when the input
HOLDACC
or
BLOCK
is activated. The accumulation time can be set to the
initTimeAcc
parameter value by activating the
LOADINT
input with the LHMI and it can be reset to
zero by activating the
RESETACC
input. The
RESETACC
input can be activated by a
binary input. The accumulated time
ACCTIME
is provided as a service output.
The last completed individual event time is updated in the
LASTEVTD
output. This output
holds the last completed individual event time until the next event to complete.
Trip logic
The individual event and accumulation timer values are compared to the
tCont
and
tAcclLimit
settings respectively. If these counter values exceed their limit values,
TRIPCONT
and
ACCALARM
outputs will be activated. The
TRIPACC
output is activated
if both the
ACCALARM
and
BFI_3P
signals are activated. A common
TRIP
signal is
generated when either
TRIPCONT
or
TRIPACC
is activated.
1MRK 511 365-UUS A
Section 10
Frequency protection
Phasor measurement unit RES670 2.1 ANSI
317
Technical manual
Содержание Relion 670 Series RES670
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