ABB Relion 611 Series, Technical Manual

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GUID-27C77008-B292-4112-9CF6-4B95EE19B9EC V1 EN
Figure 95: Example of INTRPTEF operation in ”Intermittent EF” mode in the
faulty feeder, Peak counter limit=3
The timer calculates the start duration value START_DUR which indicates the
percentage ratio of the start situation and the set operating time. The value is available
in the monitored data view.
Timer 2
If the function is used in the directional mode and an opposite direction transient is
detected, the
BLK_EF
output is activated for the fixed delay time of 25 ms. If the
START
output is activated when the
BLK_EF
output is active, the
BLK_EF
output is
deactivated.
Blocking logic
There are three operation modes in the blocking function. 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, the whole
Section 4
1MRS757454 D
Protection functions
208 611 series
Technical Manual