| Abstract |
Electronic tap changer for 500kVA distribution power transformer with continuous PWM switching operation was designed and tested. Besides many important issues such as the converter (tap changer) topology, actual switching pattern, isolation voltage, selection of the power supplies, system lay-out, etc... there is one critical design aspect that made the difference between working or failing concept. Current measurement method preventing a DC saturation and DC flux of the transformer under some circumstances appeared to be critical for the success of the electronic tap changer. The practical experience with the designed converter - electronic tap changer showed its importance. In this paper this design aspect is investigated and its solution is proposed. |
