Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample
Power transformers represent one of the most important components in terms of generation, transmission and distribution of electrical power. Precisely for this reason, it is necessary to pay some attention in terms of preventive electrical measurements that should be done in order to have an adequat...
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Electrical Engineering Institute Nikola Tesla
2023-01-01
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| Series: | Zbornik Radova: Elektrotehnički Institut "Nikola Tesla" |
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| Online Access: | https://scindeks-clanci.ceon.rs/data/pdf/0350-8528/2023/0350-85282333015M.pdf |
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| author | Milić Momčilo Jovanović Đorđe Dimitrijević Marko |
| author_facet | Milić Momčilo Jovanović Đorđe Dimitrijević Marko |
| author_sort | Milić Momčilo |
| collection | DOAJ |
| description | Power transformers represent one of the most important components in terms of generation, transmission and distribution of electrical power. Precisely for this reason, it is necessary to pay some attention in terms of preventive electrical measurements that should be done in order to have an adequate insight into their condition, avoid unwanted breakdowns and thus ensure stable and reliable operation of the entire power system. However, there are situations when power transformers fail due to various factors. In such cases, depending on which protection has reacted and preemptively switched off the observed transformer, and especially in the case of an outage due to the differential protection of the transformer, it is necessary to carry out certain tests before possible reconnection in order to assess the reason for the outage and the continued ability of the transformer itself to work. Electrical tests should be preceded by sampling oil from the transformer (and/or gas and oil from the Buchholz relay) for chemical analysis by the gas chromatography method. The results of the chemical analysis of the oil sample can express doubts about possible irregularities that may be a problem for further normal operation of the transformer and such situations are followed by certain electrical tests whose results in most cases will give a better insight into the state of the transformer itself. This paper will give examples of the results of electrical measurements (most often insulation resistance and dielectric loss factor of windings, magnetizing currents and ohmic resistance of windings) made after power transformers were out of operation and measurements after bad results of chemical analysis of oil samples. |
| format | Article |
| id | doaj-art-0e1b90932d44448c915d3b3a48977844 |
| institution | Kabale University |
| issn | 0350-8528 2406-1212 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Electrical Engineering Institute Nikola Tesla |
| record_format | Article |
| series | Zbornik Radova: Elektrotehnički Institut "Nikola Tesla" |
| spelling | doaj-art-0e1b90932d44448c915d3b3a489778442025-01-08T16:53:47ZengElectrical Engineering Institute Nikola TeslaZbornik Radova: Elektrotehnički Institut "Nikola Tesla"0350-85282406-12122023-01-01202333153110.5937/zeint33-479270350-85282333015MExamples of power transformers testing after outages and bad results of the chemical analysis of the oil sampleMilić Momčilo0https://orcid.org/0000-0002-3331-8301Jovanović Đorđe1https://orcid.org/0009-0009-3706-5151Dimitrijević Marko2Univerzitet u Beogradu, Elektrotehnički fakultet, Beograd, SerbiaUniverzitet u Beogradu, Elektrotehnički institut Nikola Tesla, Beograd, SerbiaUniverzitet u Beogradu, Elektrotehnički fakultet, Beograd, SerbiaPower transformers represent one of the most important components in terms of generation, transmission and distribution of electrical power. Precisely for this reason, it is necessary to pay some attention in terms of preventive electrical measurements that should be done in order to have an adequate insight into their condition, avoid unwanted breakdowns and thus ensure stable and reliable operation of the entire power system. However, there are situations when power transformers fail due to various factors. In such cases, depending on which protection has reacted and preemptively switched off the observed transformer, and especially in the case of an outage due to the differential protection of the transformer, it is necessary to carry out certain tests before possible reconnection in order to assess the reason for the outage and the continued ability of the transformer itself to work. Electrical tests should be preceded by sampling oil from the transformer (and/or gas and oil from the Buchholz relay) for chemical analysis by the gas chromatography method. The results of the chemical analysis of the oil sample can express doubts about possible irregularities that may be a problem for further normal operation of the transformer and such situations are followed by certain electrical tests whose results in most cases will give a better insight into the state of the transformer itself. This paper will give examples of the results of electrical measurements (most often insulation resistance and dielectric loss factor of windings, magnetizing currents and ohmic resistance of windings) made after power transformers were out of operation and measurements after bad results of chemical analysis of oil samples.https://scindeks-clanci.ceon.rs/data/pdf/0350-8528/2023/0350-85282333015M.pdfpower transformerselectrical insulating systemelectrical measurementschemical analyzes of oil samplesdifferential relay protection |
| spellingShingle | Milić Momčilo Jovanović Đorđe Dimitrijević Marko Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample Zbornik Radova: Elektrotehnički Institut "Nikola Tesla" power transformers electrical insulating system electrical measurements chemical analyzes of oil samples differential relay protection |
| title | Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample |
| title_full | Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample |
| title_fullStr | Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample |
| title_full_unstemmed | Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample |
| title_short | Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample |
| title_sort | examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample |
| topic | power transformers electrical insulating system electrical measurements chemical analyzes of oil samples differential relay protection |
| url | https://scindeks-clanci.ceon.rs/data/pdf/0350-8528/2023/0350-85282333015M.pdf |
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