{"id":1065,"date":"2018-01-29T15:50:51","date_gmt":"2018-01-29T13:50:51","guid":{"rendered":"http:\/\/elth.ucv.ro\/fisiere\/anale\/?p=1065"},"modified":"2018-01-29T15:52:32","modified_gmt":"2018-01-29T13:52:32","slug":"analyzing-signals-from-a-primary-winding-of-a-locomotive-transformer-with-three-types-of-wavelet-based-transforms","status":"publish","type":"post","link":"https:\/\/elth.ucv.ro\/fisiere\/anale\/?p=1065","title":{"rendered":"Analyzing Signals from a Primary Winding of a Locomotive Transformer with Three Types of Wavelet-Based Transforms"},"content":{"rendered":"<h3 style=\"text-align: center;\">Abstract<\/h3>\n<table style=\"height: 448px;\" border=\"0\" width=\"621\" bgcolor=\"#FFFFFF\">\n<tbody>\n<tr>\n<td width=\"562\">The paper is concerned with the analysis of in-stantaneous values and evaluation of certain power quality indices corresponding to phase currents and voltages ac-quired from the primary winding of a locomotive trans-former. Representative data sets acquired during all operat-ing regimes (acceleration, constant speed, normal and re-spectively regenerative braking) were analyzed. Firstly the background noise was estimated by using a wavelet thrash-ing tree considering a wavelet mother with a short filter. Specific computational aspects related to the use of the Sta-tionary Wavelet Transform were presented and it was used to evaluate the instantaneous values of the fundamental harmonic, respectively the distorting residue. Discrete Wavelet Transform was used for 3 situations to deal with time-frequency localization of deviations from stationarity. A nodal analysis was also made with an original implemen-tation of the Wavelet Packet Transform in a special situa-tion, when the deviation from stationarity nearby the right edge prevents the use of DWT. Excepting the thrashing tree, the wavelet mother used in all transformations relied on a filter of length 40 due to the good properties of selectivity relative to the harmonics\u2019 energies. All methods were used to evaluate the 3 major root mean square values (for fun-damental frequency, for distorting residue and total). The results yielded by different methods were compared. A good convergence of methods was noticed. Explanations for the small differences are suggested.<\/td>\n<td width=\"66\"><a href=\"http:\/\/elth.ucv.ro\/fisiere\/anale\/wp-content\/uploads\/2018\/01\/Analyzing-Signals-from-a-Primary-Winding-of-a-Locomotive-Transformer-with-Three-Types-of-Wavelet-Based-Transforms.pdf\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-191\" src=\"http:\/\/elth.ucv.ro\/fisiere\/anale\/wp-content\/uploads\/2015\/03\/images1.jpg\" alt=\"images\" width=\"100\" height=\"104\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Abstract The paper is concerned with the analysis of in-stantaneous values and evaluation of certain power quality indices corresponding to phase currents and voltages ac-quired from the primary winding of a locomotive trans-former. Representative data sets acquired during all operat-ing regimes (acceleration, constant speed, normal and re-spectively regenerative braking) were analyzed. Firstly the background noise &hellip; <a href=\"https:\/\/elth.ucv.ro\/fisiere\/anale\/?p=1065\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Analyzing Signals from a Primary Winding of a Locomotive Transformer with Three Types of Wavelet-Based Transforms<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1065","post","type-post","status-publish","format-standard","hentry","category-fara-categorie"],"_links":{"self":[{"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=\/wp\/v2\/posts\/1065","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1065"}],"version-history":[{"count":1,"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=\/wp\/v2\/posts\/1065\/revisions"}],"predecessor-version":[{"id":1066,"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=\/wp\/v2\/posts\/1065\/revisions\/1066"}],"wp:attachment":[{"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1065"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1065"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/elth.ucv.ro\/fisiere\/anale\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}