Pickup Values
You can set the pickup value for the reactive power stage at address 5511 Q> Pickup.
Example:
Q > 5 % of the supply system rating
V
Nomsec
= 100 V
I
Nomsec
= 1 A
this yields the (default) setting value Q> Pickup for Q> Pickup
100 V · 1 A · √3 · 0.05 = 8.7 VAR
At address 5512 U< Pickup, you can enter the pickup value for the voltage stage.
Delays
Address 5513 Delay Gen. CB is used to set the time delay for tripping the circuit breaker of the generation
facility, e.g. at the generator.
Enter the time delay for tripping the circuit breaker at the supply system connection point at address 5514
Delay Grid CB. Always set the delay time longer than delay time Delay Gen. CB.
Close Release
At address 5521 Recl. release the close release is switched ON or OFF.
At address 5522 U> Reclose you can specify the release voltage. Set the value to approx. 95 % of the rated
voltage value (default).
Specify the delay time for releasing the generator reconnection at address 5523 T Reclose.
Furthermore, enter the admitted deviation from the rated frequency. At address 5524 Pos. f-diff enter
the frequency deviation in positive direction and at address 5525 Neg. f-diff in negative direction. If the
measured frequency is within this range, this reconnection condition is satisfied.
Address 5526 Incl. 27/Q Trip determines whether the tripping indication of the QU protection is taken
into account for the reconnection release.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding
secondary nominal current of the current transformer.
Addr.
Parameter C Setting Options Default Setting Comments
5501 27/Q-Protection OFF
ON
OFF 27 / Q dir. con. Protection
5502 I-Release 1A 0.02 .. 0.20 A; 0 0.10 A Current-Rel. for Trip and
Reclose
5A 0.10 .. 1.00 A; 0 0.50 A
5503 Inrush blk NO
YES
NO blocking with inrush
5504 Q> Direction Forward
Reverse
Forward Reactive power direction
5511 Q> Pickup 1A 1.70 .. 10000.00 VAR 8.70 VAR Reactive power threshold
for pickup
5A 8.50 .. 50000.00 VAR 43.50 VAR
5512 U< Pickup 10.00 .. 210.00 V 85.00 V Undervoltage threshold for
pickup
5513 Delay Gen. CB 0.00 .. 60.00 sec 0.50 sec Trip time delay generator
CB
5514 Delay Grid CB 0.00 .. 60.00 sec 1.50 sec Trip time delay grid CB
2.9.3
Functions
2.9 Undervoltage-controlled reactive power protection (27/Q)
SIPROTEC 4, 7SJ80, Manual 145
E50417-G1140-C343-A8, Edition 12.2017
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