Differential Protection Phase Comparison Protection - Siemens SIPROTEC 7SD80 Manual

Technical Data

4.3 87 Differential Protection Phase Comparison Protection

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.
Pickup 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
296
= 1 A 0.20 A to 4.00 A
I
Nom
I = 5 A 1.00 A to 20.00 A
Nom
I = 1 A 0.20 A to 4.00 A
Nom
= 5 A 1.00 A to 20.00 A
I
Nom
I = 1 A 0.50 A to 4.00 A
Nom
I = 5 A 2.50 A to 20.00 A
Nom
I = 1 A
Nom
= 5 A
I
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
N
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
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011