Technical Data
4.3 Differential Protection
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
588
4.3 Differential Protection
Pickup Values
Intertrippings
Differential current,
I-DIFF>
I
N
= 1 A 0.10 A to 20.00 A Increments 0.01 A
I
N
= 5 A 0.50 A to 100.00 A
Differential current when switching onto a
fault;
I-DIF>SWITCH ON
I
N
= 1 A 0.10 A to 20.00 A Increments 0.01 A
I
N
= 5 A 0.50 A to 100.00 A
Differential current, high set differential
current
I-DIFF>>
I
N
= 1 A 0.80 A to 100.00 A
or ∞ (stage disabled)
Increments 0.01 A
I
N
= 5 A 4.00 A to 500.00 A
or ∞ (stage disabled)
Differential current, high set differential
current when
switching onto a fault; I-DIF>>SWITCHON
I
N
= 1 A 0.80 A to 100.00 A
or ∞ (stage inactive)
Increments 0.01 A
I
N
= 5 A 4.00 A to 500.00 A
or ∞ (stage inactive)
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 require a transfer
rate 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 times of the I-DIFF>> stages approx.
or all ends typical 35 ms to 50 ms
Pickup / tripping times of the I-DIFF> stages approx.
for 2 ends minimum (50 Hz / 60 Hz) 27 ms / 24 ms
typical (50 Hz / 60 Hz) 29 ms / 26 ms
for 3 ends minimum (50 Hz / 60 Hz) 27 ms / 24 ms
typical (50 Hz / 60 Hz) 31 ms / 28 ms
for 6 ends minimum (50 Hz / 60 Hz) 32 ms / 28 ms
typical (50 Hz / 60 Hz) 38 ms / 35 ms
Dropout times of the I-DIFF> stages approx.
for all ends typical 35 ms to 50 ms
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