What is gas chromatograph?
A gas chromatograph (GC) is an analytical instrument for analyzing composition and concentration of compound of a sample. The analysis performed by a gas chromatograph called gas chromatography.
Why is it important to have purified oil in a transformer?
1. Gas in transformer oil can cause arcing, corona discharge, overheating and even explosion. It degrades the quality of transformer oil and reduces the reliability and lifetime of the transformer. There are two types of gas in transformer oil. One is gas bubble which can be seen by naked eye, the other ...
What is ASTM D445?
It is an ASTM International Standard Test Method for the analysis of viscosity in lubricant oil. Its full title is ASTM D445 Standard Test Method for kinematic viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity). For complete information of ASTM D445, please visit ASTM ...
Total Acid Number(TAN)
Total Acid Number(TAN) is a parameter to define the deterioration of lubricants. The more acidity lubricant oil contains, the worse quality lubricant oil is. In other words, the lubricant oil is degraded. In addition, once the lubricant oil has a large amount of acid number, it will be harm to equipment ...
5 basic tests performed on lubricant oil
Usually there are 5 basic test items are performed on lubricant oil: 1. Kinematic viscosity test 2. flash point test 3. Moisture test 4. Acidity test 5. Mechanical impurity test If it is low temperature, pour point test is also under consideration.
The role of gas chromatography in compositional analyses in the petroleum indust
Because of the complex character of petroleum fractions and products, gas chromatography plays an important role as an analytical technique in this area. For the majority of oil fractions classifying or group-type analyses are performed rather than determinations of all the individual constituents. The ...
Breakdown voltage is a very important factor to transformer oil. Take oil sample from transformer, and put it into the tester. The gap between both electrodes should be 2.5mm. Then, heating, the voltage should be gradually increased. At one value there is a flash takes place, and this value is termed ...
What is types of tests needed for transformer oil?
Following basic tests are recommended for transformer oil: Dissolved gas analysis, Dielectric breakdown voltage, Moisture, Dielectric dissipation factor, Kinematic viscosity, Surface tension(Interfacial tension), Color, Flash point, Pour point and Acidity.
What kind of gas can be measured by DGA?
Generally, the following nine dissolved gas in transformer oil can be analyzed: hydrogen(H2), oxygen(O2), nitrogen(N2), carbon monoxide(CO), carbon dioxide(CO2), methane(CH4), ethane(C2H6), ethylene(C2H4) and acetylene(C2H2). When using DGA to measure the dissolved gas in transformer oil, we suggest ...
Surface tension, also known as interfacial tension, is a contractive tendency of the surface of a petroleum product that allows it to resisit and external force. Surface tension is used for measuring surface stress.