Tolerances
Voltages 0.5 % of the setting value or 0.05 V
Currents 1 % of the setting value or 5 mA (I
rated
= 1 A) or
25 mA (I
rated
= 5 A, f
rated
± 10 %),
valid for protection-class current transformers
1 % of the setting value or 0.1 mA (I
rated
= 1.6 A) or
0.5 mA (I
rated
= 8 A, f
rated
± 10 %),
valid for instrument transformers
Time delays 1 % of the setting value or 10 ms
Undervoltage Protection with Any Voltage
Setting Values
Measured value Measured phase-to-ground voltage V
A
Measured phase-to-ground voltage V
B
Measured phase-to-ground voltage V
C
Measured phase-to-phase voltage V
AB
Measured phase-to-phase voltage V
BC
Measured phase-to-phase voltage V
CA
Calculated phase-to-phase voltage V
AB
Calculated phase-to-phase voltage V
BC
Calculated phase-to-phase voltage V
CA
Calculated voltage V0
Method of measurement Fundamental component
RMS value
Threshold value
67
0.300 V to 340.000 V Increments of 0.001 V
Time delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout ratio 1.01 to 1.20 Increments of 0.01
Dropout
The greater dropout differential (= | pickup value – dropout value |) 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 overvoltage and of 105 % for the
undervoltage functionality.
Minimum absolute dropout differential 150 mV sec.
Times
Operate time with time delay = 0 ms, typical
Approx. 25 ms + OOT
68
at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Operate time with time delay = 0 ms, maximum Approx. 30 ms + OOT at 50 Hz
Approx. 26 ms + OOT at 60 Hz
12.10.8
67
If you have selected the method of measurement = RMS value, do not set the threshold value under 10 V.
68
OOT (Output Operating Time): additional delay of the output medium used, see Chapter 12.1.4 Relay Outputs
Technical Data
12.10 Voltage Protection
842 SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
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