P
Q
Non
operating
area
Operating
area
Start Value
Figure 591: Operating characteristics of DUPPDPR with setting Start value
Timer
Once activated, the Timer activates the START output. The time characteristics
are according to DT. When the operation timer has reached the value of
Operate
delay time
, the OPERATE output is activated. In a drop-off situation, that is, if the
underpower condition disappears before the operation delay is exceeded, the timer
reset state is activated. If the reset timer reaches the value set by
Reset delay time
,
the operation timer resets and the START output is deactivated.
The Timer calculates the START_DUR value which indicates the percentage of the
time elapsed since the activation of the START output with respect to
Operate delay
time
. The value is available in the Monitored data.
The DISABLE input can be used to coordinate the correct operation during the
generator start-up situation. By activating the DISABLE signal, both the START and
OPERATE outputs are blocked. Once the DISABLE signal is deactivated, the Timer
remains blocked for an additional time duration as set through the setting
Disable
time
.
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 protection relay's 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,
1MRS759142 F
Protection functions
REX640
Technical Manual
1059
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