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Function Limits
Power measurement three-phase
Power measurement single-phase
Relationship I
measurement
Times
Pickup times:
Current, voltage (phase quantities)
for 2 times the setting value
for 10 times the setting value
Current, voltage (symmetrical components)
for 2 times the setting value
for 10 times the setting value
Power
typical
maximum (small signals and threshold values)
Power factor
Frequency
Frequency change for 1.25 times the setting value
Voltage change dV/dt for 2 times the setting value
Binary input
Dropout times:
Current, voltage (phase quantities)
Current, voltage (symmetrical components)
Power
typical
maximum
Power factor
Frequency
Frequency change
Voltage change
Binary input
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
for I
for I
for I
for I
/I
for I
2
1
for I
= 1 A
Positive sequence system current > 0.03 A
Nom
= 5 A
Positive sequence system current > 0.15 A
Nom
= 1 A
Phase current > 0.03 A
Nom
= 5 A
Phase current > 0.15 A
Nom
= 1 A
Positive or negative sequence system current >
Nom
0.1 A
= 5 A
Positive or negative sequence system current >
Nom
0.5 A
approx. 30 ms
approx. 20 ms
approx. 40 ms
approx. 30 ms
approx. 120 ms
approx. 350 ms
300 to 600 ms
approx. 100 ms
approx. 220 ms
approx. 220 ms
approx. 20 ms
< 20 ms
< 30 ms
< 50 ms
< 350 ms
< 300 ms
< 100 ms
< 200 ms
<200 ms
< 10 ms
Technical Data
4.19 Flexible Protection Functions
399
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