REG 316*4 1MRB520049-Uen / Rev. C ABB Switzerland Ltd
12-5
Fig. 12.4 Example of the input transformer connections for a
directional protection function (‘DirCurrentDT’,
‘DirCurrentInv’, ‘MinReactance’, ‘Power’, ‘Pole-Slip’,
‘UIfPQ’ and ‘MeasureModule’)
Providing the c.t’s, v.t’s and input transformers are connected as
shown in Fig. 12.4, the details concerning direction given in
Index 3 apply, i.e. when active power is flowing from the gen-
erator to the power system, the power measured by the power
function is positive.
The star-point c.t’s may also be used (dotted connections).
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