TRANSIENT RECOVERY VOLTAGE MEASURING DEVICE, TRANSIENT RECOVERY VOLTAGE MEASURING METHOD, AND TRANSIENT RECOVERY VOLTAGE MEASURING PROGRAM

摘要

Using a waveform conversion based on a value proportional to time from the origin, a common tangent line is easily generated, the common tangent line being drawn between a bump portion present in the range from the origin to the crest value and the bump portion corresponding to the crest value. A transient recovery voltage measuring device has: a storage unit (20) for storing a transient recovery voltage waveform consisting of multiple frequencies; a waveform conversion unit (12) for converting the transient recovery voltage waveform on the basis of a proportional value obtained by multiplying time from the origin by a proportional constant; a crest determination unit (13) for, in the converted waveform, determining two points having the same maximum value; an adjustment unit (122) for adjusting the proportional constant in the waveform conversion unit (12) until the two points having the same maximum value are determined by the crest determination unit (13); a tangent point detection unit (14) for obtaining two points in the transient recovery voltage waveform, corresponding to the two points determined by the crest determination unit (13); and a tangent line generation unit (15) for generating a first tangent line passing through the detected two points in the transient recovery voltage waveform.