Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach
Transformer performance and efficiency can be enhanced by effectively address the properties of its insulation system. The power transformer insulation system weakens as a result of operational thermal stresses brought on by dynamic loading and shifting environmental patterns. Winding hot spot tempe...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-02-01
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| Series: | Heliyon |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844024023697 |
| _version_ | 1797267668669038592 |
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| author | Edwell T. Mharakurwa Dorothy W. Gicheru |
| author_facet | Edwell T. Mharakurwa Dorothy W. Gicheru |
| author_sort | Edwell T. Mharakurwa |
| collection | DOAJ |
| description | Transformer performance and efficiency can be enhanced by effectively address the properties of its insulation system. The power transformer insulation system weakens as a result of operational thermal stresses brought on by dynamic loading and shifting environmental patterns. Winding hot spot temperature is a crucial metric that must be maintained below the prescribed limit while power transformers are operating so as to maintained power system reliability. This is due to the fact that, among other variables, the time-dependent aging effect of insulation depends on transitions in hot spot temperatures. Due to the non‐linear nature of the conventional mathematical models used to determine these temperatures, and complexity of thermal phenomena, investigations still need to be exercised to fully understand the variables that associate with hot spot temperature computation with minimum error. This paper explores the possibilities of enhancing top oil and hot spot temperature estimation accuracy through the use of an adaptive neuro-fuzzy inference (ANFIS) technique. The paper presents an adaptive neuro fuzzy model to approximate the hot spot temperature of a mineral oil-filled power transformer based on loading, and established top oil temperature. Initially, a sub-ANFIS top oil temperature estimation model based on loading and ambient temperature as inputs is established. Using a hybrid optimization technique, the ANFIS membership functions were fine-tuned throughout the training process to reduce the difference between the actual and anticipated outcomes. The correctness and reliability of the created adaptive neural fuzzy model have been verified using real-world field data from a 60/90MVA, 132 kV power transformers under dynamic operating regimes. The ANFIS model results were validated against field measured values and literature-based electrical-thermal analogous models, establishing a precise input-output correlation. The developed ANFIS model achieves the highest coefficient of determination for both TOT and HST (0.98 and 0.96) and the lowest mean square error (7.8 and 10.3) among the compared thermal models. Correct determination of HST can help asset managers in thermal analysis trending of the in-service transformers, helping them to make proper loading recommendations for safeguarding the asset. |
| first_indexed | 2024-03-08T00:09:07Z |
| format | Article |
| id | doaj.art-5a02669f0a2e46bd842aba791bea96b4 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-04-25T01:20:15Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-5a02669f0a2e46bd842aba791bea96b42024-03-09T09:28:00ZengElsevierHeliyon2405-84402024-02-01104e26338Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approachEdwell T. Mharakurwa0Dorothy W. Gicheru1Corresponding author.; Department of Electrical & Electronic Engineering Dedan Kimathi University of Technology (DeKUT), Private Bag, 10 143, Nyeri, KenyaDepartment of Electrical & Electronic Engineering Dedan Kimathi University of Technology (DeKUT), Private Bag, 10 143, Nyeri, KenyaTransformer performance and efficiency can be enhanced by effectively address the properties of its insulation system. The power transformer insulation system weakens as a result of operational thermal stresses brought on by dynamic loading and shifting environmental patterns. Winding hot spot temperature is a crucial metric that must be maintained below the prescribed limit while power transformers are operating so as to maintained power system reliability. This is due to the fact that, among other variables, the time-dependent aging effect of insulation depends on transitions in hot spot temperatures. Due to the non‐linear nature of the conventional mathematical models used to determine these temperatures, and complexity of thermal phenomena, investigations still need to be exercised to fully understand the variables that associate with hot spot temperature computation with minimum error. This paper explores the possibilities of enhancing top oil and hot spot temperature estimation accuracy through the use of an adaptive neuro-fuzzy inference (ANFIS) technique. The paper presents an adaptive neuro fuzzy model to approximate the hot spot temperature of a mineral oil-filled power transformer based on loading, and established top oil temperature. Initially, a sub-ANFIS top oil temperature estimation model based on loading and ambient temperature as inputs is established. Using a hybrid optimization technique, the ANFIS membership functions were fine-tuned throughout the training process to reduce the difference between the actual and anticipated outcomes. The correctness and reliability of the created adaptive neural fuzzy model have been verified using real-world field data from a 60/90MVA, 132 kV power transformers under dynamic operating regimes. The ANFIS model results were validated against field measured values and literature-based electrical-thermal analogous models, establishing a precise input-output correlation. The developed ANFIS model achieves the highest coefficient of determination for both TOT and HST (0.98 and 0.96) and the lowest mean square error (7.8 and 10.3) among the compared thermal models. Correct determination of HST can help asset managers in thermal analysis trending of the in-service transformers, helping them to make proper loading recommendations for safeguarding the asset.http://www.sciencedirect.com/science/article/pii/S2405844024023697Hot spot temperatureTop oil temperatureAdaptive neuro-fuzzy inference systemDynamic loadingPower transformerSoft computing |
| spellingShingle | Edwell T. Mharakurwa Dorothy W. Gicheru Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach Heliyon Hot spot temperature Top oil temperature Adaptive neuro-fuzzy inference system Dynamic loading Power transformer Soft computing |
| title | Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach |
| title_full | Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach |
| title_fullStr | Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach |
| title_full_unstemmed | Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach |
| title_short | Transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach |
| title_sort | transformer hot spot temperature estimation through adaptive neuro fuzzy inference system approach |
| topic | Hot spot temperature Top oil temperature Adaptive neuro-fuzzy inference system Dynamic loading Power transformer Soft computing |
| url | http://www.sciencedirect.com/science/article/pii/S2405844024023697 |
| work_keys_str_mv | AT edwelltmharakurwa transformerhotspottemperatureestimationthroughadaptiveneurofuzzyinferencesystemapproach AT dorothywgicheru transformerhotspottemperatureestimationthroughadaptiveneurofuzzyinferencesystemapproach |