Functions
2.9 Jump of Voltage Vector
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
109
Figure 2-33
Logic diagram of the vector jump detection
2.9.2
Setting Notes
General
The vector jump protection is only effective and available if address
146
VECTOR JUMP
is set to
Enabled
during configuration.
Under address
4601
VECTOR JUMP
the function can be turned
ON
or
OFF
.
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 vector. The value to be set must be established in
accordance with the particular power system. This can be done on the basis of the simplified equivalent circuit
of the diagram „Voltage Vector Following Load Shedding“ in the Functional Description section, or using
network calculation software.
If a setting is too sensitive, the protection function is likely to perform a network decoupling every time loads
are connected or disconnected. Therefore the default setting is
10°
.
The admissible voltage operating range can be set at addresses
4605
for
V MIN
and
4606
for
V MAX
. The
setting values for
V MIN
and
V MAX
always refer to phase-phase voltages. With a single-phase connection
they refer to the phase-ground voltage of the selected connection. Setting range limits are to some extent a
matter of the utility's policy. The value for
V MIN
should be below the admissible level of short voltage dips for
which network decoupling is desired. The default setting is
80 %
of the nominal voltage. For
V MAX
the
maximum admissible voltage must be selected. This will be in most cases
130 %
of the nominal voltage.
