Figure. 5.4.27 - 141. Transformer tap changer.
Calculating the generated differential current — The biased settings
Now we have all the necessary data to calculate a naturally generated differential current based on the
known errors and possible variables.
First we need to calculate the maximum uncertainty (I
meas, unc
) from the various magnitudes inside the
transformer. In this example, the transformer has a tap changer that affects the internal currents;
however, its effects cannot be estimated reliably and the current's maximum uncertainty needs to be
calculated. If there is no tap changer, the maximum uncertainty can be calculated sufficiently enough
by summing the maximum inaccuracies of the CTs on the HV and LV sides.
Genera
Generattor Commander
or Commander
Instruction manual
Version: 2.07
264
© Arcteq Relays Ltd
IM00001
Summary of Contents for Generator Commander
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