| 摘要 |
Three-phase transformer testing method and system enabling convenient performance of ANSI-required checking of polarity and phase-relation and also enabling measurements of core loss, load loss and transformer ratio to be performed conveniently. Only a total of six test leads are needed, being connected one each to three high-voltage transformer terminals H1, H2 and H3 and being connected one each to three low-voltage terminals X1, X2 and X3. Since only six test leads are needed, it is easy to arrange them and to connect them without confusion to the six transformer terminals. Residual voltage differences can be used for determining the true angular relationships between unshrunken voltages on the high- and low-voltage sides, trigonometric calculations and manipulations using these apparently meaningless, voltage-difference "readings" enable determinations of true values of voltage magnitudes and thus enable determinations of the "VOLTAGE RELATIONS" as required by ANSI for checking polarity and phase-relation. Savings in labor and time are achieved; chances for mistakes are reduced.
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