2nd Harmonic Detection Ground
Setting Values
Measured value
IN measured
3I0 calculated
2nd harmonic content
10 % to 45 %
Increments of 1%
Times
Operating times
Approx. 29 ms
Pickup
Harmonic: I
2nd harm
/I
1st harm
Setting value or at least
I
1st harm
= 10 mA sec. and
I
2nd harm
= 10 mA sec. (I
rated
= 1 A)
I
1st harm
= 50 mA sec. and
I
2nd harm
= 50 mA sec. (I
rated
= 5 A)
Dropout
The greater dropout differential (=
| pickup threshold – dropout threshold |
) of the following
2 criteria applies:
Dropout differential derived from the parameter
Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for the overcurrent protection and a dropout
ratio of 105 % applies for the undercurrent protection.
Minimum absolute dropout differential
Protection-class current transformers
15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument transformers
0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Harmonics: I
2nd harm
/I
1st harm
0.75 or
I
2nd harm
= 5 mA sec. (I
rated
= 1 A) or
I
2nd harm
= 25 mA sec. (I
rated
= 5 A)
Frequency Operating Range
0.9 ≤ f/f
rated
≤ 1.1
According to specified tolerances
10 Hz ≤ f < 0.9 f
rated
1.1 f
rated
< f ≤ 90 Hz
Slightly expanded tolerances
f < 10 Hz
f > 90 Hz
Inactive
Tolerances
Harmonics: I
2nd harm
/I
1st harm
1 % of the setting value
for setting values l
2nd harm
/
1st harm
12.12
Technical Data
12.12 2nd Harmonic Detection Ground
SIPROTEC 5, Merging Unit 6MU85, Manual
847
C53000-G5040-C074-1, Edition 01.2020
