The acetglene of a 500 kV 3-phase main transfermer in one factory is detected in the oil chromatogram in phaseB.After the cover of the transformer is removed
the overall checkup and testing are carried out
and the possible fault modes have been listed and analyzed.Through analyzing item by item
the probability level degrees of the various fault modes are arranged.The causes of faults are demonstrated
and the most possible reason caused this transformer abnormal incident is put forward.The improvement measure is proposed.