Technical Data
4.3 Differential Protection
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
338
4.3 Differential Protection
Pickup Values
Tripping Times
Delay times
Differential current,
I-DIFF>
I
N
= 1 A 0.10 to 20.00 A Increment 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 Increment 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 0,80 to 100,00 A
or 8 (stage disabled)
Increment 0.01 A
I
N
= 5 A 4,00 to 500,00 A
or 8 (stage disabled)
Differential current, high set differential
current when
Switching; I-DIF>>SWITCHON
I
N
= 1 A 0,80 to 100,00 A
or ∞ (stage disabled)
Increment 0.01 A
I
N
= 5 A 4,00 to 500,00 A
or ∞ (stage disabled)
Tolerances 5 % of set value or 1% I
N
per end
The operating times depend on the communication speed. The following data require a transfer rate of 512 kbit/s.
Pickup / trip times of the I-DIFF>> stages at 50 or 60 Hz
approx.
minimum 16 ms
typical 20 ms
Dropout time of the I-DIFF>> stages approx. typical 35 ms to 50 ms
Pickup / trip times of the I-DIFF> stages approx. minimal
(50 Hz/60 Hz)
31 ms/29 ms
typical
(50 Hz/60 Hz)
34 ms/32 ms
Dropout time of the I-DIFF> stages approx. typical 35 ms to 50 ms
Delay of I-DIFF stage T-DELAY I-DIFF> 0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Delay of I-DIFF stage
for 1-phase pickup
T3I0 1PHAS 0.00 s to 60.00 s
or ∞ (stage disabled for 1-
phase pickup)
Increments 0.01 s
Expiry tolerances 1 % of setting value or 10 ms
The set times are pure delay times with definite time protection.
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