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   reliability assessment of distribution transformers considering load harmonics  
   
نویسنده ahmadi i. ,mirzaie m. ,alizadeh shyrayeh h. ,ahmadi gorji m.
منبع iranian journal of electrical and electronic engineering - 2022 - دوره : 18 - شماره : 4 - صفحه:2534 -2534
چکیده    The progressive application of non-linear loads in distribution systems (ds) increases current harmonics flow in ds’s apparatuses, especially distribution transformers (dts). since dts’ operating temperature rises due to the harmonics flow, their loading should be reduced such that the hot spot temperature (hst) is preserved under its permissible value. this means that dts’ available capacity is influenced by load harmonic content. in this paper, a novel formulation for dts’ failure rate in the presence of harmonics is presented as a function of load harmonic contents. using the suggested equivalent failure rate, dts’ available capacity in harmonic polluted ds is mathematically formulated. additionally, the presence of the harmonic increases the hst, leading to dts’ aging acceleration. therefore, the impact of harmonic components on dts’ aging is arithmetically modeled. to evaluate the efficacy of the suggested reliability model, it is applied to three distinct dts having respectively industrial, commercial, and residential loads. the obtained results indicate that the available capacity of dts with the same rated capacity would be different regarding to their load harmonic contents. on the other hand, it is comprehended from the achieved results that the aging acceleration factor (faa) of the dts increases owing to their load harmonic contents.
کلیدواژه available capacity ,distribution transformer (dt) ,harmonics ,aging ,reliability assessment.
آدرس university of science and technology of mazandaran, iran, babol noshirvani university of technology, faculty of electrical and computer engineering, iran, university of science and technology of mazandaran, iran, islamic azad university, mahmudabad branch, department of electrical engineering, iran
پست الکترونیکی ahmadigorji@yahoo.com
 
     
   
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