Siemens SIPROTEC 5 6MU85 - 12.7.2 Stage with Inverse-Time Characteristic Curve

Tolerances
3I0 measured via I4
46
, method of measurement =
fundamental component
1 % of the setting value or 5 mA (I
rated
= 1 A)
or 25 mA (I
rated
= 5 A), (f
rated
± 10 %)
3I0 measured via I4
47
, method of measurement = RMS value
(33 % harmonics, in relation to fundamental component)
Up to 30th harmonic 1 % of the setting value or 5 mA (I
rated
= 1 A)
or 25 mA (I
rated
= 5 A), (f
rated
± 10 %)
Up to 50th harmonic, f
rated
= 50 Hz 3 % of the setting value or 20 mA (I
rated
= 1 A)
or 100 mA (I
rated
= 5 A), (f
rated
± 10 %)
Up to 50th harmonic, f
rated
= 60 Hz 4 % of the setting value or 20 mA (I
rated
= 1 A)
or 100 mA (I
rated
= 5 A), (f
rated
± 10 %)
Time delays 1 % of the setting value or 10 ms
Influencing Variables for Thresholds
Transient excess pickup in method of measurement =
fundamental component, for τ > 100 ms (with
complete unbalance)
< 5 %
Stage with Inverse-Time Characteristic Curve
Setting Values
Method of measurement
Fundamental component
RMS value
–
Threshold value
48
1 A @ 50 and 100 Irated 0.010 A to 35.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.05 A to 175.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.002 A to 8.000 A Increments of 0.001 A
Dropout Disk emulation
Instantaneous
–
Time multiplier 0.00 to 15.00 Increments of 0.01
Minimum time of the curve 0.00 s to 1.00 s Increments of 0.01 s
Additional time delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout
95 % of 1.1 ⋅ threshold value
Minimum absolute dropout differential
Protection-class current transformer 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
12.7.2
46
Slightly expanded tolerances will occur during the calculation of 3I0, maximum factor of 2
47
Slightly expanded tolerances will occur during the calculation of 3I0, maximum factor of 2
48
If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
rated,sec
.
Technical Data
12.7 Overcurrent Protection, Ground
SIPROTEC 5, Merging Unit 6MU85, Manual 817
C53000-G5040-C074-1, Edition 01.2020