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Technical Data
4.4 Ground Fault Differential Protection in Grounded Systems
4.4
Ground Fault Differential Protection in Grounded Systems
Pickup Values
Differential current;
87N L: I-DIFF>
Operating Times
The operating times depend on the communication speed. The following data require a transmission rate of 512 kbit/s.
Pickup/trip times of the 87N L: I-DIFF> element at
at 50 Hz or 60 Hz approx.
Dropout times of the 87N L: I-DIFF> element
approx.
Differential current
Delay of the 87N L: I-DIFF> element approx.
Frequency range
Time Delays
Tripping delay
Expiry tolerances
The set times are pure time delays.
Emergency Operation
Communication failure
Frequency Operating Range
Operating Range
Standard Precision of Operational Measured Values
The standard accuracy of the operational measured values of the ground fault differential protection of ± 0.5 % of the
rated operational current is ensured up to a transformer error adjustment of 2:1.
264
= 1 A
0.10 A to 20.00 A
Ι
Nom
0.50 A to 100.00 A
= 5 A
Ι
Nom
minimum
typical
maximum
minimum
typical
maximum
87L Trip Delay 0.00 s to 0.10 s
1 % of setting value or 10 ms
See section "Time Overcurrent Protection"
0.8 ≤ f/f
≤ 1.2
Nom
stable at machine startup (f = 0 to f
Increments0.01 A
35 ms
37 ms
40 ms
30 ms
32 ms
34 ms
5% of setting value or 1 % Ι
1 % of setting value or 10 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
Increased tolerances
Increments0.01 s
)
Nom
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Nom
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