ABB RED615 Technical Manual page 505

1YHT530004D05 D
615 series
Technical Manual
Operation mode
Freq> OR df/dt
The module calculates the start duration value which indicates the percentage ratio
of the start situation and set operate time (DT). The start duration is available
according to the selected value of the Operation mode setting.
Table 423: Start duration value
Operation mode in use
Freq<
Freq>
df/dt
The combined start duration START_DUR indicates the maximum percentage ratio
of the active protection modes. The values are available via the Monitored data view.
Blocking logic
There are three operation modes in the blocking functionality. The operation modes
are controlled by the BLOCK input and the global setting "Configuration/System/
Blocking mode" which selects the blocking mode. The BLOCK input can be
controlled by a binary input, a horizontal communication input or an internal signal
of the IED program. The influence of the BLOCK signal activation is preselected
with the global setting Blocking mode.
The Blocking mode setting has three blocking methods. In the "Freeze timers"
mode, the operation timer is frozen to the prevailing value. In the "Block all"
mode, the whole function is blocked and the timers are reset. In the "Block
OPERATE output" mode, the function operates normally but the OPERATE output
is not activated.
Protection functions
Description
A parallel operation between the protection
methods is enabled. The START output is
activated when either of the measured values of
the protection module exceeds its set value. A
detailed information from the active module is
available at the STR_OFRQ and STR_FRG
outputs. The shortest operate delay time from
Operate Tm Freq or Operate Tm df/dt is
the set
dominant regarding the OPERATE output. The
time characteristic is according to DT. The
characteristic that activates the OPERATE output
can be seen from the OPR_OFRQ or OPR_FRG
output. If the frequency gradient restores before
the module operates, the reset timer is activated.
If the timer reaches the value set by the
delay Tm df/dt setting, the operate timer resets
and the STR_FRG output is deactivated. If the
frequency restores before the module operates,
the reset timer is activated. If the timer reaches
Reset delay Tm Freq
the value set by the
setting, the operate timer resets and the
STR_UFRQ output is deactivated.
Available start duration value
ST_DUR_UFRQ
ST_DUR_OFRQ
ST_DUR_FRG
Section 4
Reset
499