Caution: If earth fault differential protection is used, the requirement for the phase current transformer of the
REF side is as follows:
1
/
4
≤ F
Adap
≤ 4, (for the starpoint transformer remains
1
/
8
≤ FAdap ≤ 8)
[wandlerueberpruefung-7ut6x, 1, en_GB]
Figure D-1 CT verification for Devices 7UT6x
The CB layout within the power station unit is not specified.
x”
d
= sub-transient direct-axis reactance of the generator in p.u.
u
k
= transformer short-circuit voltage HV - LV in %
R
relay
= assumed with 0.1 Ω, (the consumption of the above devices is below 0.1
VA)
Current Transformer Requirements
D.1 General Requirements
526 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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