Siemens Siprotec 7UM611, Руководство пользователя

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2.20 Jump of Voltage Vector
125
7UM61 Manual
C53000-G1176-C127-3
The vector jump function becomes ineffective on exiting the admissible frequency
band. The same applies for the voltage. In such a case the limiting parameters are
U
MIN
and
U MAX
.
If the frequency or voltage range is not maintained, the logic generates a logical 1, and
the reset input is continuously active. The result of the vector jump measurement is
suppressed. If, for instance, the voltage is connected, and the frequency range is cor-
rect, the logical 1 changes to 0. The timer
T BLOCK
with reset delay keeps the reset
input active for a certain time, thus preventing a pickup caused by the vector jump
function.
If a short-circuit causes the voltage to drop abruptly to a low value, the reset input is
immediately activated to block the function. The vector jump function is thus prevented
from causing a trip.
Figure 2-40 Logic Diagram of the Vector Jump Detection
2.20.2 Setting Notes
General The vector jump protection is only effective and available if address
146 VECTOR
JUMP
is set to
Enabled
during configuration.
Address
4601 VECTOR JUMP
serves to switch the function
ON
or
OFF
or to block only
the trip command (
Block relay
).
Pickup Values The value to be set for the vector jump (address
4602 DELTA PHI
) depends on the
feed and load conditions. Abrupt active power changes cause a jump of the voltage
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