Study On Insulation Aging Properties And Detection Technique Of Traction Transformers

With the development of high-speed railway , higher reliability of traction transformer is required. Traction transformer is one of the most important components of the traction power supply system, uniform supervising and monitoring of its operation can discover its running problem, thus effectively avoid accidents caused by traction transformer.At present, routine-check method is used in the prevention of traction transformer faults. The judgment of transformer insulation condition, which is based on preventive test and DGA, has played an important role of accident prevention for a long time. But in routine preventive test, the real operation condition of transformer is not noticed, it may cause superabundant and unnecessary repair and stoppage, and the deficiency can't be found on time. In the other hand, because of the big quantity and the wide distribution of traction transformer, it needs rather onerous test and cost too much. Considering the misplay in operation, the inaccuracy will be enlarged, and it can't prevent the unplanned fault. On-line monitoring can reduce the operation cost and raise the reliability. At present online monitoring and diagnosis for HV instrument has improved a lot, but online monitoring of traction transformer in railway is rarely reported.This paper calculated the influence of traction transformer temperature rising, which is based on traction load and simulation, established a simulative experiment platform, and test the oilpaper insulation. Based on analysis of insulation on-line detection of several kinds of transformers, the DGA on-line detection system for traction transformer was designed, then oil-gas separated technology and gas sensor array technique were resolved.