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Section 4
1MAC050144-MB C
Protection functions
264
615 series ANSI
Technical Manual
Table 262: Operation modes for operation logic
Operation mode
Description
Freq<
The function operates independently as the underfrequency (“Freq<“) protection
function. When the measured frequency is below the set value of the
Pickup value
Freq<
setting, the module activates the
PIC
and
STR_UFRQ
outputs. The time
characteristic is according to DT. When the operation timer has reached the value set
by the
Trip Tm Freq
setting, the
TRIP
and
OPR_UFRQ
outputs are activated. If the
frequency restores before the module operates, the reset timer is activated. If the timer
reaches the value set by the
Reset delay Tm Freq
setting, the trip timer resets and the
PICKUP
and
STR_UFRQ
outputs are deactivated.
Freq>
The function trips independently as the overfrequency (“Freq>”) protection function.
When the measured frequency exceeds the set value of the
Pickup value Freq>
setting,
the module activates the
PICKUP
and
STR_OFRQ
outputs. The time characteristic is
according to DT. When the operation timer has reached the value set by the
Trip Tm
Freq
setting, the
TRIP
and
OPR_OFRQ
outputs are activated. 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 trip timer resets and the
PICKUP
and
STR_OFRQ
outputs are deactivated.
df/dt
The function trips independently as the frequency gradient (“df/dt”), rate-of-change,
protection function. When the frequency gradient exceeds the set value of the
Pickup
value df/dt
setting, the module activates the
PICKUP
and
STR_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
OPR_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, thetrip timer resets and
the
PICKUP
and
STR_FRG
outputs are deactivated.
Freq< + df/dt
A consecutive operation is enabled between the protection methods. When the
measured frequency is below the set value of the
Pickup value Freq<
setting, the
frequency gradient protection is enabled. After the frequency has dropped below 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
STR_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
OPR_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 operate timer resets and the
PICKUP
and
STR_FRG
outputs are
deactivated. The
OPR_UFRQ
output is not active when this operation mode is used.
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
STR_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
OPR_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
trip timer resets and the
PICKUP
and
STR_FRG
outputs are deactivated. The
OPR_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
STR_UFRQ
and
STR_FRG
outputs. The shortest trip delay time from the set
Trip Tm Freq
or
Operate 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
OPR_UFRQ
or
OPR_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 trip timer resets and the
STR_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 trip timer resets and the
STR_UFRQ
output is
deactivated.
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
Page 712: ......