کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4945633 1438710 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transformer insulation coordination using volt-time curve and limit-state surface formulation
ترجمه فارسی عنوان
هماهنگی عایق ترانسفورماتور با استفاده از منحنی ولتاژ و فرم سطح محدود
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر هوش مصنوعی
چکیده انگلیسی
This paper presents a novel method for the power transformer insulation coordination, based on the risk of failure analysis due to lightning surges, that uses its insulation strength volt-time curve and a limit-state surface formulation. The limit-state surface is derived in a novel way, from the optimal number of systematic numerical simulations of transformer terminal overvoltages-emanating from station impinging lightning surges-while accounting for the transformer insulation volt-time curve and surge arresters protective characteristics and disposition. The proposed method further employs a state-of-the-art transmission line (TL) and substation equipment models for lightning-surge transient analysis, constructed in the EMTP software package. It also uses the electrogeometric model of lightning attachment to TLs, in order to estimate the expected number of direct lightning strikes, along with a bivariate statistical distribution of lightning currents. The main aspects of the proposed method are demonstrated by means of the computational example featuring an air-insulated substation power transformer lightning insulation coordination. Simulation results exhibit many benefits of the proposed method. Sensitivity analysis further reveals different influences that the various model parameters have on the transformer insulation coordination design.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Electrical Power & Energy Systems - Volume 90, September 2017, Pages 256-266
نویسندگان
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