Figure 209: 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 function is blocked and the timers are reset. In the "Block OPERATE
Protection functions
1MRS757644 H
424
620 series
Technical Manual
