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(When β-method is selected for [Phase matching])
The phase angle differences between line currents on each side of the power transformer are
corrected by setting according to the hands of a clock as follows:
Rule 1:
If all the windings are star-connected, then take one of the windings as a reference winding and set
1 (= one o’clock) for it. For other winding(s), set the phase angle difference from the reference
winding by the expression of the leading angle. One hour corresponds to leading by thirty degrees.
Example 1 If the setting winding leads the reference winding by 60°, set 3 (= three o’clock).
Example 2 If the setting winding is in phase with the reference winding, set 1 (= one
o’clock).
Example 3 If the setting winding lags the reference winding by 60° (that is leading by 300°),
set 11 (= eleven o’clock).
Rule 2:
If any of the windings are delta-connected, take one of the delta-connected winding(s) as a
reference winding and set 0 (= noon) for it. For other star- or delta-connected winding(s), set
according to the Rule 1 mentioned above.
Example 1 If the setting winding leads the reference winding by 60°, set 2 (= two o’clock).
Example 2 If the setting winding is in phase with the reference winding, set 0 (= noon).
Example 3 If the setting winding lags the reference winding by 60° (that is leading by 300°),
set 10 (ten o’clock).
The settings for the two-winding transformer connections described in IEC60076-1 are listed in
Table 2.2.5.5.
Three-winding transformers are also set according to the above mentioned rules.
Example 4 Setting for star/star/delta transformer.
Setting (d1 / d2 / d3)
Primary (d1) 11
Secondary (d2) 11
Tertiary (d3) 0
Tertiary
Secondary
Primary