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Operation mode
Description
Freq> + df/dt
A consecutive operation is enabled between the protection methods.
When the measured frequency exceeds the set value of the
Pickup
value Freq> setting, the frequency gradient protection is enabled. After
the frequency exceeds the set value, the frequency gradient is
compared to the set value of the
Pickup value df/dt setting. When the
frequency gradient exceeds the set value, the module activates the
PICKUP
and
PICKUP_FRG
outputs. The time characteristic is
according to DT. When the operation timer has reached the value set by
the
Trip Tm df/dt setting, the
TRIP
and
TRIP_FRG
outputs are
activated. If the frequency gradient restores before the module trips, the
reset timer is activated. If the timer reaches the value set by the
Reset
delay Tm df/dt setting, the operation timer resets and the
PICKUP
and
PICKUP_FRG
outputs are deactivated. The
TRIP_OFRQ
output is not
active when this operation mode is used.
Freq< OR df/dt
A parallel operation between the protection methods is enabled. The
PICKUP
output is activated when either of the measured values of the
protection module exceeds its set value. Detailed information about the
active module is available at the
PICKUP_UFRQ
and
PICKUP_FRG
outputs. The shortest trip delay time from the set
Trip Tm Freq or Trip
Tm df/dt is dominant regarding the
TRIP
output. The time characteristic
is according to DT. The characteristic that activates the
TRIP
output
can be seen from the
TRIP_UFRQ
or
TRIP_FRG
output. If the frequency
gradient restores before the module trips, the reset timer is activated. If
the timer reaches the value set by the
Reset delay Tm df/dt setting, the
operation timer resets and the
PICKUP_FRG
output is deactivated. If
the frequency restores before the module trips, the reset timer is
activated. If the timer reaches the value set by the
Reset delay Tm Freq
setting, the operation timer resets and the
PICKUP_UFRQ
output is
deactivated.
Freq> OR df/dt
A parallel operation between the protection methods is enabled. The
PICKUP
output is activated when either of the measured values of the
protection module exceeds its set value. Detailed information about the
active module is available at the
PICKUP_OFRQ
and
PICKUP_FRG
outputs. The shortest trip delay time from the set
Trip Tm Freq or Trip
Tm df/dt is dominant regarding the
TRIP
output. The time characteristic
is according to DT. The characteristic that activates the
TRIP
output
can be seen from the
TRIP_OFRQ
or
TRIP_FRG
output. If the frequency
gradient restores before the module trips, the reset timer is activated. If
the timer reaches the value set by the
Reset delay Tm df/dt setting, the
operation timer resets and the
PICKUP_FRG
output is deactivated. If
the frequency restores before the module trips, the reset timer is
activated. If the timer reaches the value set by the
Reset delay Tm Freq
setting, the operation timer resets and the
PICKUP_UFRQ
output is
deactivated.
The module calculates the pickup duration value
PICKUP_DUR
which indicates the
percentage ratio of the pickup situation and set trip time DT. The pickup duration is
available according to the selected value of the
Operation mode
setting.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
681
Technical Manual
Summary of Contents for Relion 615 series
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