Siemens SIPROTEC 7UM62, Manual

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Jump of Voltage Vector
175
7UM62 Manual
C53000-G1176-C149-3
Pickup Values The value to be set for the vector jump (address
4602 DELTA PHI
) depends on the
feeding and load conditions. Abrupt load changes in the active power cause a jump of
the voltage vector. The value to be set must be specifically determined for the power
system considered. This can be done on the basis of the equivalent circuit diagram in
Figure 2-80, or by means of a network calculation software.
If the setting is too sensitive, the protection function is likely to perform a network de-
coupling every time loads are connected or disconnected. Therefore, the default set-
ting is 10°.
The permissible voltage operating range can be set in the addresses
4605A
for
U MIN
and
4606A
for
U MAX
. The limit values of the setting range are to some extent a matter
of the utility’s philosophy. The value for
U MIN
should be less than the permissible
level of short voltage dips for which network decoupling is required. The default setting
is 80 % of the rated voltage.
U MAX
should be the maximum permissible voltage. This
will be in most cases 130 % of the rated voltage.
Time Delays The time delay
T DELTA PHI
(address
4603
) should be left at zero, except if you
wish to transmit the trip indication with a delay to a logic (CFC), or to leave enough
time for an external blocking to take effect.
After expiry of the timer
T RESET
(address
4604
), the protection function is automat-
ically reset. The reset time depends on the decoupling philosophy. It must have ex-
pired before the circuit breaker is reclosed. Where the automatic reset function is not
used, the timer is set to
∞
. The reset signal must come in that case from the binary
input (circuit breaker auxiliary contact).
The timer
T BLOCK
with reset delay (address
4607A
) helps to avoid overfunctioning
when voltages are connected or disconnected. Normally, the default setting need not
be changed. If changes are necessary, they can be performed with the DIGSI commu-
nication software (advanced parameters). It must be kept in mind that
T BLOCK
should
always be set to more than the measuring window for vector jump measurement (2
cycles).
2.25.2.1 Settings of the Vector Jump Detection
Addr. Setting Title Setting Options Default Setting Comments
4601 VECTOR JUMP OFF
ON
Block relay for trip com-
mands OFF Jump of Voltage Vector
4602 DELTA PHI 2..30
°
10
°
Jump of Phasor DELTA PHI
4603 T DELTA PHI 0.00..60.00 sec;
∞
0.00 sec T DELTA PHI Time Delay
4604 T RESET 0.10..60.00 sec;
∞
5.00 sec Reset Time after Trip
4605A U MIN 10.0..125.0 V 80.0 V Minimal Operation Voltage U
MIN
4606A U MAX 10.0..170.0 V 130.0 V Maximal Operation Voltage U
MAX
4607A T BLOCK 0.00..60.00 sec;
∞
0.10 sec Time Delay of Blocking