Primeri ispitivanja energetskih transformatora nakon ispada iz pogona i loših rezultata hemijske analize uzorka ulja
Authors/Creators
- 1. Nikola Tesla Institute of Electrical Engineering
Description
Energetski transformatori predstavljaju jednu od najvažnijih komponenti u pogledu proizvodnje, prenosa i distribucije električne energije. Baš zato neophodno je da im se posveti izvesna pažnja po pitanju preventivnih električnih merenja kako bi se imao adekvatan uvid u njihovo stanje, izbegli neželjeni kvarovi i na taj način obezbedio stabilan i pouzdan rad elektroenergetskog sistema. Ipak, dešava se da usled raznih faktora dolazi do ispada energetskih transformatora iz pogona. U takvim slučajevima, u zavisnosti od toga koja zaštita je reagovala i preventivno isključila posmatrani transformator, a posebno u slučaju ispada po diferencijalnoj zaštiti transformatora, neophodno je pre eventualnog ponovnog uključenja izvršiti određena ispitivanja u cilju procene razloga za ispad i dalje sposobnosti za rad samog transformatora. Električnim ispitivanjima bi trebalo da prethodi uzorkovanje ulja iz transformatora (i/ili gasa i ulja iz Buholc releja) radi njihove hemijske analize metodom gasne hromatografije. Rezultati hemijske analize uzorka ulja mogu da iskažu sumnju u moguće neregularnosti koje mogu biti problem za dalji normalan pogon transformatora, pri čemu u takvim situacijama slede električna ispitivanja čiji će rezultati merenja u većini slučajeva dati bolji uvid u stanje samog transformatora. U ovom radu će biti dati primeri rezultata električnih merenja (najčešće izolacioni otpor i faktor dielektričnih gubitaka namotaja, struje magnećenja i omski otpor namotaja) izvršenih nakon ispada energetskih transformatora iz pogona i merenja nakon loših rezultata hemijske analize uzoraka ulja.
Abstract
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.
Files
2-47927-Momcilo.pdf
Files
(416.1 kB)
| Name | Size | Download all |
|---|---|---|
|
md5:fd5d8845e478855955d24411332b25a4
|
416.1 kB | Preview Download |
Additional details
Additional titles
- Alternative title (English)
- Examples of power transformers testing after outages and bad results of the chemical analysis of the oil sample