Dropout for Definite-Time Overcurrent Protection Stages
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for overcurrent/overvoltage and of 105 % for
undervoltage functionality.
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)
Voltage transformer 150 mV sec.
Operate Curves and Dropout Characteristic Curves According to IEC
Extension of the operate time during operation with
inrush-current detection
Approx. 10 ms
The operate curves and dropout characteristic curves according to IEC can be found in the chapter Technical
Data under Inverse-Time Overcurrent Protection.
Operate Curves and Dropout Characteristic Curves According to ANSI/IEEE
The operate curves and dropout characteristic curves according to IEC can be found in the chapter Technical
Data under Inverse-Time Overcurrent Protection.
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 ≤ 80 Hz
Slightly expanded tolerances
f < 10 Hz
f > 80 Hz
Inactive
Tolerances
Currents, 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 %)
Currents, method of measurement = RMS value
(33 % part of harmonic 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 %)
Voltage 0.5 % of the setting value or 0.05 V
Operate time for 2 ≤ I/I threshold value ≤ 20 5 % of the reference (calculated) value
+ 2 % current tolerance or 30 ms
Dropout time for I/I threshold value ≤ 0.90 5 % of the reference (calculated) value
+ 2 % current tolerance or 30 ms
Time delays 1 % of the setting value or 10 ms
Technical Data
11.16 Voltage-Dependent Overcurrent Protection, Phases
1166 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-A, Edition 05.2018
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