Siemens siprotec 7SD5

4.3 Differential Protection
533
7SD5 Manual
C53000-G1176-C169-1
4.3 Differential Protection
Pickup Values
Tripping Times
Differential current,
I-DIFF>
I
N
= 1 A 0.10 to 20.00 A Increments 0.01 A
I
N
= 5 A 0.50 to 100.00 A
Differential current when switching onto
a fault;
I-DIF>SWITCH ON
I
N
= 1 A 0.10 to 20.00 A Increments 0.01 A
I
N
= 5 A 0.50 to 100.00 A
Differential current, high set differential
current
I-DIFF>>
I
N
= 1 A 0.8 to 100.0 A
or ∞ (stage disabled)
Increments 0.01 A
I
N
= 5 A 4.0 to 500.00 A
or ∞ (stage disabled)
Tolerances
For 2 or 3 ends 5 % of setting value or 1% I
N
per end
For 6 ends 10 % of setting value or 1% I
N
per end
The operating times depend on the number of ends and the communication speed. The following data presuppose a
transmission speed of 512 kBit/s and the output of commands via high-speed output relays (7SD5****-*N/P/Q/R/S/T)
Pickup / trip times of the I-DIFF>> stages at 50 or 60 Hz approx.
For 2 ends minimum 9 ms
typical 12 ms
For 3 ends minimum 9 ms
typical 12 ms
For 6 ends minimum 14 ms
typical 20 ms
Dropout time of the I-DIFF>> stages approx.
For all ends typical 35 ms to 50 ms
Pickup / trip times of the I-DIFF> stages approx.
For 2 ends minimum (50/60 Hz) 27/24 ms
typical (50/60 Hz) 29/26 ms
For 3 ends minimum (50/60 Hz) 27/24 ms
typical (50/60 Hz) 31/28 ms
For 6 ends minimum (50/60 Hz) 32/28 ms
typical (50/60 Hz) 38/35 ms
Dropout time of the I-DIFF> stages approx.
For all ends typical 35 ms to 50 ms
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