Evaluation of Power Transformers' Effective Hot-Spot Factors by Thermal Modeling of Scrapped Units
The ultimate life of a power transformer is critically governed by the condition of its insulation paper which undergoes thermal degradation during the operation. A thermal model has been published in the IEC transformer loading guide 60076-7 and can be used to calculate the windings' hot-spot...
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| Veröffentlicht in: | IEEE transactions on power delivery 2014-10, Vol.29 (5), p.2077-2085 |
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| creator | Dongyin Feng Zhongdong Wang Jarman, Paul |
| description | The ultimate life of a power transformer is critically governed by the condition of its insulation paper which undergoes thermal degradation during the operation. A thermal model has been published in the IEC transformer loading guide 60076-7 and can be used to calculate the windings' hot-spot temperature based on operating conditions and thermal parameters, and to assess the insulating paper's aging rate. However, the accuracy of hot-spot temperature is greatly affected by the generally unknown hot-spot factor. In this paper, utilizing the paper samples of scrapped transformers and the degree of polymerization (DP) predicted thermal lives as benchmarks are proposed and through the IEC thermal model to reversely derive the transformers' effective hot-spot factors (EHSFs) while the paper's aging mechanisms and moisture accumulation effect over lifetime have been taken into consideration. As a result, the median of 35 scrapped units' EHSF is 2.95. These EHSFs are assigned to the field sister transformers to give a practical assessment of transformer cooling efficiency and loadability. |
| doi_str_mv | 10.1109/TPWRD.2014.2339282 |
| format | Article |
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A thermal model has been published in the IEC transformer loading guide 60076-7 and can be used to calculate the windings' hot-spot temperature based on operating conditions and thermal parameters, and to assess the insulating paper's aging rate. However, the accuracy of hot-spot temperature is greatly affected by the generally unknown hot-spot factor. In this paper, utilizing the paper samples of scrapped transformers and the degree of polymerization (DP) predicted thermal lives as benchmarks are proposed and through the IEC thermal model to reversely derive the transformers' effective hot-spot factors (EHSFs) while the paper's aging mechanisms and moisture accumulation effect over lifetime have been taken into consideration. As a result, the median of 35 scrapped units' EHSF is 2.95. 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(IEEE) Oct 2014</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c431t-edf41633cf3144dca0f72d01738aeb8221005f95e94f026451ec6423e4f9bf803</citedby><cites>FETCH-LOGICAL-c431t-edf41633cf3144dca0f72d01738aeb8221005f95e94f026451ec6423e4f9bf803</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/6880412$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,776,780,792,27903,27904,54736</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/6880412$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Dongyin Feng</creatorcontrib><creatorcontrib>Zhongdong Wang</creatorcontrib><creatorcontrib>Jarman, Paul</creatorcontrib><title>Evaluation of Power Transformers' Effective Hot-Spot Factors by Thermal Modeling of Scrapped Units</title><title>IEEE transactions on power delivery</title><addtitle>TPWRD</addtitle><description>The ultimate life of a power transformer is critically governed by the condition of its insulation paper which undergoes thermal degradation during the operation. A thermal model has been published in the IEC transformer loading guide 60076-7 and can be used to calculate the windings' hot-spot temperature based on operating conditions and thermal parameters, and to assess the insulating paper's aging rate. However, the accuracy of hot-spot temperature is greatly affected by the generally unknown hot-spot factor. In this paper, utilizing the paper samples of scrapped transformers and the degree of polymerization (DP) predicted thermal lives as benchmarks are proposed and through the IEC thermal model to reversely derive the transformers' effective hot-spot factors (EHSFs) while the paper's aging mechanisms and moisture accumulation effect over lifetime have been taken into consideration. As a result, the median of 35 scrapped units' EHSF is 2.95. These EHSFs are assigned to the field sister transformers to give a practical assessment of transformer cooling efficiency and loadability.</description><subject>Aging</subject><subject>Assessments</subject><subject>Asset management</subject><subject>Coils (windings)</subject><subject>degree of polymerization</subject><subject>Insulation</subject><subject>Life cycle assessment</subject><subject>Load modeling</subject><subject>Mathematical models</subject><subject>Oil insulation</subject><subject>Power transformer insulation</subject><subject>power transformers</subject><subject>Temperature measurement</subject><subject>Thermal degradation</subject><subject>Thermal loading</subject><subject>thermal modeling</subject><subject>Transformers</subject><issn>0885-8977</issn><issn>1937-4208</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNpdkMtOwzAQRS0EEqXwA7CxxAI2KeNHEnuJoDwkEAiKWFquM4agNA52CuLvSSliwWo25947OoTsM5gwBvpkdv_8cD7hwOSEC6G54htkxLQoM8lBbZIRKJVnSpflNtlJ6Q0AJGgYkfn0wzZL29ehpcHT-_CJkc6ibZMPcYExHdGp9-j6-gPpVeizxy709MK6PsRE51909opxYRt6Gyps6vZl1fLoou06rOhTW_dpl2x52yTc-71j8nQxnZ1dZTd3l9dnpzeZk4L1GVZeskII5wWTsnIWfMkrYKVQFueKcwaQe52jlh54IXOGrpBcoPR67hWIMTle93YxvC8x9WZRJ4dNY1sMy2RYwQHKEiQb0MN_6FtYxnb4zrB8qJZlrvOB4mvKxZBSRG-6WC9s_DIMzEq7-dFuVtrNr_YhdLAO1Yj4FyiUGna5-AYAG32t</recordid><startdate>20141001</startdate><enddate>20141001</enddate><creator>Dongyin Feng</creator><creator>Zhongdong Wang</creator><creator>Jarman, Paul</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><scope>F28</scope></search><sort><creationdate>20141001</creationdate><title>Evaluation of Power Transformers' Effective Hot-Spot Factors by Thermal Modeling of Scrapped Units</title><author>Dongyin Feng ; Zhongdong Wang ; Jarman, Paul</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c431t-edf41633cf3144dca0f72d01738aeb8221005f95e94f026451ec6423e4f9bf803</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Aging</topic><topic>Assessments</topic><topic>Asset management</topic><topic>Coils (windings)</topic><topic>degree of polymerization</topic><topic>Insulation</topic><topic>Life cycle assessment</topic><topic>Load modeling</topic><topic>Mathematical models</topic><topic>Oil insulation</topic><topic>Power transformer insulation</topic><topic>power transformers</topic><topic>Temperature measurement</topic><topic>Thermal degradation</topic><topic>Thermal loading</topic><topic>thermal modeling</topic><topic>Transformers</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dongyin Feng</creatorcontrib><creatorcontrib>Zhongdong Wang</creatorcontrib><creatorcontrib>Jarman, Paul</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><jtitle>IEEE transactions on power delivery</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Dongyin Feng</au><au>Zhongdong Wang</au><au>Jarman, Paul</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evaluation of Power Transformers' Effective Hot-Spot Factors by Thermal Modeling of Scrapped Units</atitle><jtitle>IEEE transactions on power delivery</jtitle><stitle>TPWRD</stitle><date>2014-10-01</date><risdate>2014</risdate><volume>29</volume><issue>5</issue><spage>2077</spage><epage>2085</epage><pages>2077-2085</pages><issn>0885-8977</issn><eissn>1937-4208</eissn><coden>ITPDE5</coden><abstract>The ultimate life of a power transformer is critically governed by the condition of its insulation paper which undergoes thermal degradation during the operation. A thermal model has been published in the IEC transformer loading guide 60076-7 and can be used to calculate the windings' hot-spot temperature based on operating conditions and thermal parameters, and to assess the insulating paper's aging rate. However, the accuracy of hot-spot temperature is greatly affected by the generally unknown hot-spot factor. In this paper, utilizing the paper samples of scrapped transformers and the degree of polymerization (DP) predicted thermal lives as benchmarks are proposed and through the IEC thermal model to reversely derive the transformers' effective hot-spot factors (EHSFs) while the paper's aging mechanisms and moisture accumulation effect over lifetime have been taken into consideration. As a result, the median of 35 scrapped units' EHSF is 2.95. These EHSFs are assigned to the field sister transformers to give a practical assessment of transformer cooling efficiency and loadability.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/TPWRD.2014.2339282</doi><tpages>9</tpages></addata></record> |
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| source | IEEE Electronic Library (IEL) |
| subjects | Aging Assessments Asset management Coils (windings) degree of polymerization Insulation Life cycle assessment Load modeling Mathematical models Oil insulation Power transformer insulation power transformers Temperature measurement Thermal degradation Thermal loading thermal modeling Transformers |
| title | Evaluation of Power Transformers' Effective Hot-Spot Factors by Thermal Modeling of Scrapped Units |
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