Undervoltage-Controlled Reactive Power Protection (27/Q) - Siemens SIPROTEC 4 Manual

4.12

Undervoltage-controlled reactive power protection (27/Q)

Measured Values / Modes of Operation
3-phase
Measuring method for Ι, V
Pickup when
Setting Ranges / Increments
Pickup thresholds:
Current Ι
1
Voltage V
Power Q
Tripping delay time
Release delay time
Dropout delay
Function Limits
Power measurement 3-phase
Times
Pickup times:
QU protection
typical
maximum (small signals and thresholds)
Binary input
Dropout times:
QU protection
typical
maximum
Binary input
Tolerances
Pickup thresholds:
Current
Current (symmetrical compo-
nents)
Voltage
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
4.12 Undervoltage-controlled reactive power protection (27/Q)
Ι1, V, Q,
Fundamental wave
Exceeding threshold value or
falling below threshold value
for Ι = 1 A 0.02 to 0.20 A
Nom
for Ι = 5 A 0.10 to 1.00 A
Nom
10.0 to 210.00 V
for Ι = 1 A 1.0 to 100 VAR
Nom
for Ι = 5 A 5.0 to 500 VAR
Nom
0.00 to 60.00 s
0.00 to 3600.00 s
0.00 to 60.00 s
for Ι = 1 A Positive sequence system current > 0.03 A
Nom
for Ι = 5 A Positive sequence system current > 0.15 A
Nom
for Ι = 1 A 1% of set value or 10 mA at Ι
Nom
2% of set value or 20 mA bei Ι
for Ι = 5 A 1% of set value or 50 mA at Ι
Nom
2% of set value or 100 mA at Ι
for Ι = 1 A 2% of set value or 20 mA
Nom
2% of set value or 100 mA
for Ι = 5 A
Nom
1% of set value or 0.1 V
Increments 0.01 A
Increments 0.1 V
Increments 0.01 VAR
Increments 0.01 s
Increments 0.01 s
Increments 0.01 s
approx. 120 ms
approx. 350 ms
approx. 20 ms
< 50 ms
< 350 ms
< 10 ms
≥ 0.03 A
Nom
< 0.03 A
Nom
≥ 0.25 A
Nom
<0.25 A
Nom
Technical Data
391