Analysis of a PV industry polysilicon reduction furnace transformer burned instance

GOU Da-bin， YAN Yao-hui
（Kunming Metallurgical Research Materials Co. Ltd.， Qujing 655000， China）

Abstract： Aiming at solving the polysilicon reducing furnace transformer operation when the balance ability and power regulating cabinet power supply work adjustment coil tap will generate harmonics caused by local overheat problem of transformer coil insulation，a low voltage maximum to minimum current tapped coil，in accordance with the "outside-in sequence near the core arrangement" layout， and the high-voltage coil into two upper and lower coils，the middle  application of manufacturing technology was used. According to reduce furnace transformer A phase high confining ring and low confining spheres of the three-phase short-circuit fault data analysis，the relationship between the reducing furnace transformer winding structure reasonable layout and whether the coil insulation ability is good or bad was analysed，improving winding arrangement and core structure process was proposed. The method of increasing the external fan cooling，consideration on reduction furnace transformer on manufacturing process and operation conditions and the adjustment work are producing the high order harmonic are content special designs，and throughimproving running environment and process structure and other technical measures tests. The results indicate that the capacity of the resistance of harmonics and unbalancedness of the reducing furnace transformer is enhanced，short-circuit burned accident does not occur again.
Key words： photovoltaic（PV）； polysilicon； reduction furnace transformers； power adjust cabinet； winding structure； high harmonics； burned accident