| 摘要 |
<p>A method and an arrangement for determining values of impedance parameters related to a transformer configuration comprising three single pole voltage transformers (11, 12, 13) each having at least a primary winding (21, 22, 23), a secondary winding (41, 42, 43) and a tertiary winding (31, 32, 33), wherein the primary windings are connected to phases (PA, PB, PC) of a three phase electric system, wherein the arrangement comprises means for conducting an earth fault in the three phase electric system; means for measuring a primary voltage from the faulted phase; means for measuring secondary voltages from the secondary windings (41, 42, 43); and means for determining values of one or more impedance parameters related to the transformer configuration on the basis of the measured primary voltage, the measured secondary voltages and an equation relating the primary voltage to the secondary voltages and the one or more impedance parameters.</p> |
