Siemens 6MD85, Manual

Page: 1169 / 1256

Negative-Sequence Protection with Definite-Time Characteristic
Curve
Setting Values
Reference value for I
2
(I
ref
) Rated object current I
rated, obj.
Positive sequence current I
1
Pickup value 5.0 % to 999.9 % l
2
/l
ref
Increments of 0.1
Time Delay 0.00 s to 60.00 s Increments of 0.01 s
Release current
(minimum current
release) 1 A @ 50 and 100 Irated 0.030 A to 10.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 50.00 A Increments of 0.01 A
Maximum phase
current (maximum
current limiting) 1 A @ 50 and 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
Times
Pickup times Approx. 35 ms + OOT
Dropout times Approx. 35 ms + OOT
Dropout Ratio
Pickup value Approx. 0.95 for I
2
/I
ref
≥ 0.3
Operating Ranges
Current range 0.05 x I
rated, obj
≤ all phase currents ≤ setting value I
ph, max
Frequency range 10 Hz to 80 Hz
Tolerances
Pickup value
I
2
/I
rated, obj
Approx. 2 % of the setting value or 0.8 % absolute value (transformer
mismatching < 4)
I
2
/I
1
Approx. 2 % of the setting value or 4 % absolute value (I
1
> 50 mA (1 A)
or 250 mA (5 A))
Time delays 1 % of the setting value or 10 ms
11.29
Technical Data
11.29 Negative-Sequence Protection with Definite-Time Characteristic Curve
SIPROTEC 5, High-Voltage Bay Controller, Manual 1169
C53000-G5040-C015-9, Edition 11.2017