UV spectroscopy of GK transformer oil

Gafiyatullin, L. G.; Turanova, O. A.; Козлов, В. К.; Туранов, А. Н.

doi:10.1134/s0030400x10070155

Cited by 13 publications

(7 citation statements)

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“…This had previously been repeatedly demonstrated by methods of 1 H and 13 C nuclear magnetic resonance, and ultraviolet spectroscopy [7,10,11].…”

mentioning

confidence: 82%

“…These signals are characteristic of anthracene and its derivatives [3,6]. Other mono-, bi-and tricyclical aromatic hydrocarbons capable of absorption [7], and also luminescence [6] in the 200-650-nm wavelength range are also contained in the TO. Their signals in the luminescence spectra obtained are absent, however, since the coefficients of extinction of these compounds are approximately the same [6], but the quantum efficiency of the luminescence of the majority of these hydrocarbons is extremely low as compared with the anthracene [3,6].…”

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confidence: 99%

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Luminescence of grade GK transformer oil

Козлов

Garifullin

Туранов

2013

Chem Technol Fuels Oils

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“…This had previously been repeatedly demonstrated by methods of 1 H and 13 C nuclear magnetic resonance, and ultraviolet spectroscopy [7,10,11].…”

mentioning

confidence: 82%

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confidence: 99%

Luminescence of grade GK transformer oil

Козлов

Garifullin

Туранов

2013

Chem Technol Fuels Oils

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“…Investigations [4][5][6][7] have indicated that heterogeneous structures always exist in TO. A method of determining the percentage of solid particles in oil products with use of nuclear magnetic (NM) relaxation is described in the literature [8].…”

Section: G K -G R a D E T R A N S F O R M E R O I L I S I N V E S T Imentioning

confidence: 99%

“…Owing to the physical and chemical processes that take place under the action of temperature, electric fields, and circulation of oil, the composition of the heterogeneous structures is altered over the life of the TO. These processes are currently being monitored by an obsolete method [3], which, in our opinion, is unreliable due to insufficient accuracy.Investigations [4][5][6][7] have indicated that heterogeneous structures always exist in TO. A method of determining the percentage of solid particles in oil products with use of nuclear magnetic (NM) relaxation is described in the literature [8].…”

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confidence: 99%

Investigation of transformer oil by nuclear magnetic relaxation and Z-scanning

Arkhipov

Gizatullin

Shkalikov

et al. 2013

Chem Technol Fuels Oils

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G K -g r a d e t r a n s f o r m e r o i l i s i n v e s t i g a t e d b y m e t h o d s o f n u c l e a r m a g n e t i c r e l a x a t i o nand Z-scanning. The size of the heterogeneous structures in the oil increases during its service. The solid-particle content in the liquid phase, however, remains essentially unchanged, and the excess particles precipitate. The feasibility of quantitative determination of the heterogeneous-structure/liquid ratio in oil samples investigated is discussed.Heterogeneous structures -colloidal, micelle-like, and solid particles -affect the properties of transformer oils (TO), and may substantially reduce the breakdown voltage, and alter the viscosity and other TO characteristics critical to power transformers, and, consequently the power systems on the whole [1, 2]. Owing to the physical and chemical processes that take place under the action of temperature, electric fields, and circulation of oil, the composition of the heterogeneous structures is altered over the life of the TO. These processes are currently being monitored by an obsolete method [3], which, in our opinion, is unreliable due to insufficient accuracy.Investigations [4][5][6][7] have indicated that heterogeneous structures always exist in TO. A method of determining the percentage of solid particles in oil products with use of nuclear magnetic (NM) relaxation is described in the literature [8]. We have been unable, however, to find information on the applicability of this method to TO. The Z-scanning method is sensitive to nonlinear optical absorption of delocalized electrons, occurring most frequently in the heterogeneous particles [9]. This study described results of TO investigation by NM-relaxation and Z-scanning methods.

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“…In oil filled transformers, DGA is used as one of the entrenched techniques to predict incipient faults inside its enclosure. Electrochemical sensors and gas chromatography encountered many problems that optical detecting methods are widely used in on-line monitors for dissolved gas-in-oil of power transformers, but some fatal defects exist [10][11][12]. There are very good detection techniques to analyze the aged transformer oil which have been used by many researchers and obtained influential results.…”

Section: Introductionmentioning

confidence: 99%

Condition assessment of transformer oil using UV-Visible spectroscopy

Hussain

Karmakar

2014

2014 Eighteenth National Power Systems Conference (NPSC)

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Transformer plays an important role in both the transmission and distribution system in electrical power system network. During continuous long period of its operation, transformers are mainly subject to huge thermal and electrical stresses, which can cause the degradation of the insulating oil present inside the transformer. The degradation of such insulation leads to catastrophic failure of transformer which further leads to power system network failure. Since there is a great necessity of inspecting the oil time to time, absorption spectroscopy is considered for condition assessment tool because it has the potential to take measurements during operation, which has better measurement ranges for low concentrations. In this work, a novel method used for transformer health assessment is developed based on the characteristic of spectral absorption by adopting ultraviolet absorption technique. The outcome of the absorption of in-service and laboratory aged transformer oil is so significant that absorption increases by observable margin over a wide range of wavelengths. From the obtained results, the sensitivity and reliability of the UV-Visible method in monitoring degradation of oil is analysed and discussed.

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UV spectroscopy of GK transformer oil

Cited by 13 publications

References 1 publication

Luminescence of grade GK transformer oil

Luminescence of grade GK transformer oil

Investigation of transformer oil by nuclear magnetic relaxation and Z-scanning

Condition assessment of transformer oil using UV-Visible spectroscopy

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