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eng Monitoring, diagnostics and drying of transformer oil online
Mykytenko, Stanislav; Kryvokhyzha, Oleg; Pievniev, Oleksandr; Ganzha, Maxim
Transformers Magazine
Vol. 10, No. 4, 2023
The article discusses the approaches to monitoring and diagnostics of the oil-filled transformers insulation system. The positive aspects of using online monitoring and diagnostics systems are shown. The operating principle of the online diagnostics, monitoring, and insulation oil drying system developed by GlobeCore is described. A comparison is provided between the assessment of the insulation oil condition using laboratory analysis and the GlobeCore system.
Hrčak ID: 308708
eng A century of dissolved gas analysis - part I
Grisaru, Marius
Transformers Magazine
Vol. 6, No. 3, 2019
Electricity powers the world and is an
indispensable product for humanity,
almost like water and food. This
energy category needs two types of
materials which make it feasible -
electrical conductors and electrical
insulators. In practice, no one can
afford to use ideal conductors and
insulations matrixes. Accordingly, the
industry has to compromise with the
best available materials at acceptable
prices. Power transformers, like any
other electrical device, have to contain
these two types of materials. The most
advantageous insula...
Hrčak ID: 222745
eng A century of dissolved gas analysis - Part II
Grisaru, Marius
Transformers Magazine
Vol. 6, No. 4, 2019
Future brings some changes to DGA. It is expected that offline DGA in standard laboratories will gradually disappear as a routine test and transformers without online DGA will be tested by using simple portable devices. The online sensors will be monitored from a central control room with a sophisticated artificial intelligence in an effort to predict failures.
Hrčak ID: 226061
eng A century of dissolved gas analysis - part III
Grisaru, Marius
Transformers Magazine
Vol. 7, No. 1, 2020
With time, the size of the transformer increased exponentially both in power andvoltage. Although huge improvements have been made regarding the magnetic core and the decrease of core losses, a
transformer is now producing much more heat due to the design optimization and size reduction. Heat reduces the insulating
properties of the insulating matrix, reducing the conducting properties and accelerating all chemical reactions including ageing and corrosion.
The stresses from the insulation materials increase gradually. In the last century, th...
Hrčak ID: 232078
eng Standards relevant to transformers – Part VIII
Ramachandran, P.; Jhala, A.S.
Transformers Magazine
Vol. 9, No. 3, 2022
There is a large number of national and international standards covering various aspects of transformer insulating fluids such as specifications, sampling techniques, testing procedures, maintenance, diagnostics, and so on. The present paper summarises available standards and
technical brochures related to the above aspects of the insulating fluid for an immediate reference to the user.
Hrčak ID: 280329
eng THERMAL STABILITY CHANGE OF SYNTHETIC ESTER-BASED TRANSFORMER OIL
Haramija, Veronika; Vrsaljko, Dijana; Đurina, Vedran; Vrsaljko, Domagoj
Journal of Energy
Vol. 63, No. 1-4, 2014
For good transformer condition assessment it is necessary to determine the condition of
insulating materials, both liquid and solid. Transformer is reliable for as long as its insulation system
resists deterioration. Therefore, thermal and oxidation stability are important characteristics of transformer
oil. It is a measure of oil resistance for decomposition by the influence of oxygen and temperature. Oils
with good thermal and oxidation stability retain their characteristics regardless the thermal stress.
Because of environmental and saf...
Hrčak ID: 199223
eng Transformer oil fault gases under thermal stress at 160 °C – Part I
Christian, Bernd; Glaeser, Armin
Transformers Magazine
Vol. 5, No. 2, 2018
Dissolved gas analysis is a common technique in the supervision and maintenance of transformers. It can give hints on defects and faults in oil-immersed transformers by determining and quantifying the gases arising due to the thermal or electrical stress. Different algorithms for the assessment of transformers, which utilize data obtained from dissolved gas analysis, have been published so far. However, only few investigations exist that deal with the influence of the oil´s composition on the oil´s tendency of releasing gases. This research stu...
Hrčak ID: 202539
eng Transformer oil fault gases under thermal stress at 160 °C – Part II
CHRISTIAN, Bernd; GLÄSER, Armin
Transformers Magazine
Vol. 5, No. 3, 2018
Dissolved gas analysis is a common technique in the supervision and maintenance of transformers. It can give hints on defects and faults in oil-immersed transformers by determining and quantifying gases arising due to thermal or electrical stress. Different algorithms for the assessment of transformers, which deploy data obtained from dissolved gas analysis, have been published so far. However, only few investigations exist that deal with the influence of the oil’s chemical composition towards the oil’s tendency of releasing gases. This researc...
Hrčak ID: 207736
eng Not all mineral oils are equal
Lukenda, Nikola
Transformers Magazine
Vol. 6, No. 4, 2019
The life of a transformer is inherently linked to the fundamental role of insulating oils to dissipate heat and protect the transformer’s solid insulation.
Developments in refining technology means that not all mineral oils are equal, and isoparaffinic oils in particular can offer enhanced oxidative stability, lower viscosity in colder temperatures, and superior heat transfer which results in improved reliability and utility for transformer operators.
Hrčak ID: 226063
eng Economical and Reliable Transformer Maintenance by Holistic Interpretation of Insulating Oil Condition
Grisaru, Marius
Transformers Magazine
Vol. 1, No. 1, 2014
The importance and cost of transformers is described and stressed in all the literature. Transformers are one of the most important and vital links in the electricity supply chain. Despite the very high cost related to transformer failures, the tests and diagnoses of the equipment itself, the transformer owner or a person responsible for its proper operation is faced with many diagnostic approaches and most of them are either inaccurate or unnecessary and irrelevant to individual case. Of course the lack of specialists in transformer diagnoses...
Hrčak ID: 186883