Research On On-line Monitoring New Characteristic And Implement Project Of Power Transformer Winding

Statistic data indicate that windings is most possible blooey. Wingdings fault occupied 60%-70% in the power transformer. It is often that windings turn to turn short-circuit in all windings fault. Nowadays, it is be inclined to occur turn to turn short-circuit for transformer windings because of power transformer windings introduced tangle windings. Although inner short circuit current is very great, but external high voltage side current is not great after turn to turn short-circuit. So relay protection can't detect fault. This is likely to burn transformer if don't take any measures after turn to turn short-circuit.Within the country and abroad, the main means of on-line monitoring transformer is: dissolved gas analysis in oil partial discharge and windings deform on-line monitoring. In general, one problem of transformer on-line monitoring is: lack of monitoring characteristic, especially aimed at transformers windings.After analysis physical phenomena of turn to turn short-circuit, this thesis reached a conclusion: power losses must be increased when windings fault. So a new condition characteristic is put forward that used to be monitoring transformer windings, i.e. power losses. Power utility local test indicate that new characteristic is effective to monitoring transformer especially transformer windings. Based on possibility of on-line transformer monitoring, put forward a flow of on-line transformer combined oil characteristic. At last, empolder a system of transformer on-line monitoring and frame of transformer condition assessment is put forward.