| In recent years,grid-connected photovoltaic(PV)power generation is being develop ed widely.At resent,the amorphous alloy photovoltaic boost transformer in photovoltai c power generation system has no special design and requirement,and also lacks sel ection criteria and operating experience.The Chromatographic analsys of the photovol taic transformer in operation appears to exceed the standard,which will cause potenti al faults.Therefore,the research has great significance for the safe and stable operatio n of photovoltaic power generation system.In this paper,the related research work is carried out from two aspects: internal overheating and internal discharge of Photovoltaic amorphous alloy transformer.Through the theoretical analysis,field test,simulation calculation and physical model test,this paper analyzed and studied the causes of large-scale oil chromatographic anomalies of PV transformers in the wind-storage and storage power plants,and primarily determined the existence of local overheating and partial discharge of PV transformers.Through the field test and the physical model test,the overheating of PV transformers under different operating conditions was studied,and the causes of overheating in PV transformers were analyzed.At the same time,through the theoretical analysis combined with the on-site partial discharge test and the disassemble of the fault transformer,the internal discharge phenomenon and the cause of the PV transformer are analyzed and verified.Based on the analysis results,this paper determined the precautionary measures and solutions to the excessive colorization of PV amorphous alloy transformer.And from the design stage,the production stage,the acceptance phase and the operation and maintenance phase,the corresponding technical measures are proposed.The technical conditions of 35 k V amorphous amorphous alloy transformer ordering are formed,which fills the blank of the current technical requirements of PV transformer in china. |
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