Results 11 to 20 of about 25,088,946 (286)
Radiocarbon and stable carbon analysis of dissolved methane and carbon dioxide from the profile of a raised peat bog [PDF]
, 2011 We developed and tested a new method to separate CO<sub>2</sub> and CH<sub>4</sub> from bulk gas samples for radiocarbon and stable-carbon analysis that utilizes zeolite molecular sieve.
Murray, C. +2 more
core +6 more sources
Electrochemical gas detection for dissolved gas analysis [PDF]
Transformers MagazineIn a previous article, gas chromatography was described as the most popular method for Dissolved Gas Analysis (DGA) conducted in laboratories. In this article, we describe the established and prevalent DGA method for online and portable devices. Over the last half-century, most DGA analyses were performed by electrochemical detection.
Grisaru, Marius
openaire +2 more sources
Dissolved gas analysis: Gas measurement techniques - Part 1 [PDF]
Transformers Magazine, 2023 DGA (Dissolved gas analysis) is a chemical method based on chemical measurements of a few dissolved species in insulating liquids (oils). Although most of the users and diagnose-providing sources consider all DGA measurements as equal, it is important to realize that different gas measurements of gases from oil matrices possess different advantages and
Grisaru, Marius
openaire +2 more sources
Dissolved gas analysis: Gas measurements technologies – Part 2 – Gas Chromatography (GC) [PDF]
Transformers Magazine, 2023 This is the second part of the column “Gas measurement technologies for DGA”. In Part 1, the principles and problematics of DGA (dissolved gas analysis) were presented as a chemical method based on chemical measurements. The column is mainly intended for non-chemists who are interested in understanding the basics and the main weaknesses of the most ...
Grisaru, Marius
openaire +2 more sources
Spectrometric methodology for dissolved gas analysis [PDF]
Transformers MagazineIn previous columns, gas chromatography and electrochemical approaches for dissolved gas measurement were described. In this column, the oldest and emerging method, spectrometry, is described. It is an applicable method for most online and portable devices, and it may reappear in laboratories as reliable and standardized.
Grisaru, Marius
openaire +2 more sources
Dissolved gas analysis: Early fault indication and trend analysis [PDF]
Transformers Magazine, 2023 A review of the two approaches of dissolved gas analysis – detailed fault diagnosis and trend analysis with fault indication – is given. The advantages and disadvantages of the two approaches under the aspects of measurement uncertainty, economic efficiency and integration into a condition assessment strategy are outlined.
Schübel, Jürgen +1 more
openaire +2 more sources
Transformer Health Monitoring Using Dissolved Gas Analysis: A Technical Brief
International Journal of Prognostics and Health Management, 2022 As integral components of any power plant, transformers sup-ply the generated electricity to the grid. However, the trans-former’s cellulose-based paper insulation and the mineral oilin which it is immersed break down over time under stan-dard operating ...
Cody Walker +2 more
doaj +1 more source
Diagnosis Kondisi Minyak Tranformator Menggunakan Teknik Dissolved Gas Analysis [PDF]
, 2022 At the Cikalong hydropower plant there are 3 power transformers with a voltage rating of 6.3/77 kV, because of their long life, it is necessary to analyze the condition of the transformer oil.
Haz, Fauzia +2 more
core +1 more source
Frontiers in Earth Science, 2021 Previous studies have revealed that gas compositions of fluid samples collected from southwestern Taiwan, where many hot springs and mud volcanoes are distributed along with tectonic structures, show significant variation before and after some disaster ...
Ching-Chou Fu +7 more
doaj +1 more source
Energies, 2020 Transformer state forecasting and fault forecasting are important for the stable operation of power equipment and the normal operation of power systems.
Fang Yuan +5 more
doaj +1 more source