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4.3
87 Differential Protection Phase Comparison Protection
Pickup Values
Differential current, dynamic;
87L Idyn>
Differential current when switching onto a
fault;
87L Idyn close>
Differential current, static;
87L Isteady>
Operating Times
The operating times depend on the communication speed. The following data require a transmission rate of 512 kbit/s.
Pickup time with infeed at both ends approx.
Trip times with infeed at both ends approx.
Command time approx.
Start time at 50 Hz approx.
Frequency range
Tolerances
Time Delaytime delays
Tripping delay
Expiry tolerances
The set times are pure time delays
Emergency Operation
Communication failure
Frequency Operating Range
Operating Range
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
4.3 87 Differential Protection Phase Comparison Protection
= 1 A
0.20 A to 4.00 A
Ι
Nom
1.00 A to 20.00 A
= 5 A
Ι
Nom
= 1 A
0.20 A to 4.00 A
Ι
Nom
1.00 A to 20.00 A
= 5 A
Ι
Nom
0.50 A to 4.00 A
= 1 A
Ι
Nom
= 5 A
2.50 A to 20.00 A
Ι
Nom
= 1 A
Ι
Nom
= 5 A
Ι
Nom
87L Trip Delay 0.00 s to 0.10 s
1 % of set value or 10 ms
See section "Time Overcurrent Protection"
0.8 ≤ f/f
≤ 1.2
Nom
stable when starting machine
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
15 ms to 40 ms
35 ms to 40 ms
15 ms to 90 ms
51 ms
45 Hz to 55 Hz at 50 Hz
55 Hz to 65 Hz at 60 Hz
25 Hz to 45 Hz at 50 Hz
30 Hz to 55 Hz at 60 Hz
if only the static element is active
20 mA
100 mA
Increments 0.01 s
Technical Data
261
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