DGA(Dissolved gas analysis) Tool's and Different Fault Occur in Transformer Oil

Interpretation of Gas AnalysisDGA Diagnostic Tools

IEEE published a guideline for the investigation of gases that’s generate in the working transformer popularly known as ANSI ANSI/IEEEC57.104-1978 Standard. This stranded deal with the method of analyzing the, procedure of sampling, separating the gases in the transformer the result and uses of tools.

In 1992, IEEE published another standard guide line knows as IEEE Std C57.104-1991 and this instrument focused on the DGA result. Another guide line is published in 2008 IEEE Std C57.104-2008. I IEC published a guide for the purpose of oil filled in the transformer and the gases sampling and it also work for the detection of free gases and dissolved gases since 1977.

A number of DGA diagnostic instrument which are used now a day found by IEEE C57.104 or IEC60599 guides and as the same way other one which is used basics of these two like national or international guides. As we say before there is a number of tool for guides but in here we will study with the tool that are related to these two IEEE C57.104 or IEC60599. These tow guides IEEE and IEC shows a number of ratio based instruments to find the dissolved gas analysis data. A complete summary is in the current IEEE guide as a recent draft standard (IEEE C57.104-D11d; not approved) of the IEEE guide and the IEC guide is in Table.

Dissolved Gas Analysis instrument are different of their formation, clarity and their correctness. A number of DGA diagnostic tools are simple addition or the one gases ratios for normal levels while others present of multiple gases ratios and each key gas ratio exist in some particular range values.

On-line DGA and Diagnostic Tools

Now a days the online Dissolved gas analysis create a good reputation for his excellent work and incredible measurements and also give wonderful data to the ratio based diagnostic instruments. The expert of DGA feel very easy with the help on line system .they need the snapshot of the condition of transformer and know the present dynamic condition when the transformer is working. Due to on line system introduced new feature which is unbelievable .Snapshots does not indicate diagnostic rate at that ratio. In fact due increase the market DGA in line introduced different combinations. It has also ability to count 8 diagnostic gases. These application are very important they take automate measurement and can show the accurate diagnostic instrument.

Thermal Faults                                    

A large quantity of low molecular mass gases are produce due to decomposition of minerals oil, beta fluid like that methane and hydrogen and a minimum amount of higher molecular mass gas ethylene is also produce. Temperature of beta fluid is increase as a fault, the concentration level of hydrogen gas is increase with respect to the methane gas. So the temperature accompanied the significant quantities of gases which one contain high molecular mass firstly ethane and second one is ethylene. Hydrogen gas and the minimum amount of gas acetylene (C2H2) may be formed due to temperature increase at the upper border of range. The different gases like carbon mono oxide, carbon di oxide, and the vapor of water are produced at the decomposition of beta fluid, thermal cellulose decomposition with another solid insulation at this stage the temperature is very low with respect to the decomposition of oil. The rate formation is increase or decrease with respect to the temperature. The reason is that the paper come to degrade when the temperature low as the beta fluid. All its products in gases form are predict at the normal operating temperature of the transformer.

Low Intensity Discharge for Electrical Faults

Methane and acetylene is produced in small amount when hydrogen is produced at low intensity. As increase the discharge level of two gases acetylene and ethylene the concentration level of these two gases increase sigaficnty.

High Intensity Discharge for Electrical Faults

The produced quantity of acetylene become marked at the temperature reach 700 c to 1800c when the intensity of electrical ejection reaches arcing.