ABB RELION REX640 Technical Manual page 710

Protection and control

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Protection functions

Figure 404: Alternative connection example of current transformers of Type 2

The CT secondary currents often differ from the rated current at the rated load

of the power transformer. The CT transforming ratios can be corrected on both

sides of the power transformer with the

TR2PTDF Input signals

Table 656: TR2PTDF Input signals

Table continues on the next page

CT ratio Cor Wnd 1 and CT ratio Cor Wnd 2

1MRS759142 F

Three-phase currents

Technical Manual