ABB RELION 620 Series Technical Manual page 736

Section 4
Protection functions
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GUID-D4104D30-04BC-4FE5-978A-1401F1D5301F V2 EN
Figure 370: 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
Q
Non
Operating
operating
area
area
Start Value
1MRS757644 F
P
620 series
Technical Manual