Dropout time for 2 ≤ I/threshold value I ≤ 0.90 5 % of the reference (calculated) value
+2 % current tolerance or 30 ms
Influencing Variables for Thresholds
Transient excess pickup in method of measurement =
fundamental component, for τ > 100 ms (with
complete unbalance)
< 5 %
Stage with User-Defined Characteristic Curve
Setting Values
Method of measurement Fundamental component
RMS value
–
Threshold value 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
Absolute pickup value 1 A @ 50 and 100 Irated 0.000 A to 35.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.00 A to 175.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.000 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.000 A to 8.000 A Increments of 0.001 A
Dropout Disk emulation
Instantaneous
–
Time multiplier 0.05 to 15.00 Increments of 0.01
Number of value pairs for the operate curve 2 to 30 Increments of 1
X values of the operate curve 1.00 p.u. to 20.00 p. u. Increments of 0.01 p.u.
Y values of the operate curve 0.00 s to 999.00 s Increments of 0.01 s
Number of value pairs for the dropout characteristic
curve
2 to 30 Increments of 1
X values of the dropout characteristic curve 0.05 p.u. to 0.95 p. u. Increments of 0.01 p.u.
Y values of the dropout characteristic curve 0.00 s to 999.00 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 or 95 % of the absolute
pickup 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)
Reset of the Integration Timer
Instantaneous
With dropout
Disk emulation Approx. < 0.90 ⋅ threshold value
11.9.3
Technical Data
11.9 Overcurrent Protection, Ground
SIPROTEC 5, High-Voltage Bay Controller, Manual 1141
C53000-G5040-C015-A, Edition 05.2018
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