Pdf dissolved gas analysis in power transformer using. The use of dissolved gas analysis dga to monitor the inservice behavior of. Dissolved gas analysis dga of insulating oil can provide an important basis for transformer fault diagnosis. Prediction of dissolved gas concentrations in transformer oil. If faults are found to be occurring, outages can be planned ant the fault can be rectified before major damage can occur. About 51% of these are testing equipment, 25% are gas analyzers, and 17% are other test instruments.
When gas in oil analysis indicates the presence of a possible fault, metal in oil analysis will help determine the fault type and pinpoint its location. For years, this analysis has been performed by taking samples of the transformer and ltc oil in the field for lab analysis. The third and most informative method for the detection of fault gases is the dissolved gas analysis dga technique. Transformer oil sample analysis is a useful,predictive, maintenance tool for determining transformer health. By combining various dga techniques and interpreting classical dga with fuzzy logic. Dissolved gas analysis of transformer oil electrical4u. Dissolved gas analysis determines the concentrations of certain gases in the oil such as nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrogen, methane, ethane, ethylene and acetylene a free powerpoint ppt presentation displayed as a flash slide show on. Fault detection techniques for transformer maintenance. New guideline for interpretation of dissolved gas analysis in oil filled transformers. Basics, maintenance, and diagnostics ix contents continued page 6. The gas generated in mineral oil of power transformer can be monitored by all conventional methods, online dga system and by application of various artificial intelligence practices. Dga dissolved gas analysis of transformer oil is the single best indicator of a transformers overall condition. By analyzing the relationship between the gases dissolved in transformer oil and fault types, the noncode. It is designed to extract even small traces of fault gases in transformer oil which are to be detected at an early stage, to identify a developing fault in transformer.
Interpretation of dissolved gas analysis in transformer oil using fuzzy. Dissolved gas analysis dga is the study of dissolved gases in transformer oil. Pdf dissolved gas analysis of a thermally overloaded oil. The transformers fluid not only serves as a heat transfer medium, it also a part of transformers insulation system. Pdf interpretation of dissolved gas analysis in transformer oil. Ppt dissolved gas analysis of transformer oil powerpoint. Transformer oil analysis powerlink oil refinery ltd. For more information about gc2010d transformer oil dissolved gas analyzer, please. Dissolved gas analysis equipment for online monitoring of. Transformer dissolved gas analysis diagnostics energy. Careful analysis and consideration of the presence, or more importantly, the rate of change of dissolved combustible gases in the transformer. Whenever a transformer undergoes abnormal thermal and electrical stresses, certain gases are produced due to the decomposition of the transformer oil. The parameter that currently allows for simple online monitoring in an energized transformer is the dga. However, interpretation of dga data through the use of dga diagnostic tools is not always state of the art.
Dissolved gas analysis of power transformer introduction insulating oil in an. Program development using dissolved gas analysis method. Dissolved gas analysis of insulating oil for power. The hillside aluminium smelter is located in richards bay, 200 kilometers north of durban, kwazulu. Dissolved gas analysis dga of transformers and oil. Flow chart of identification of gases present in transformer oil using. Identify and monitor critical transformer fault types with dissolved gas analyzers that easily retrofit existing transformers or can be made specifically for new builds. The dissolved gas analysis dga is popularly recognized as most useful and predictive maintenance tool for condition. Gc2010d measures dissolved gases in transformer oil. The degradation of such transformer oil produces different kinds of gases as byproducts which entirely or partially dissolve in the transformer oil and the quality of dielectric strength of insulating oil is degrading. Dissolved gas analysis dga of transformer insulating oil is considered the single best indicator of a transformer s overall condition and is practiced universally today.
Metal in oil analysis of transformer oil is used to complement dissolved gas analysisdga. This means that the guidelines for interpretation of dissolved gas analysis dga for conventional transformer oil can be followed when working with beta fluid. Analysis of dissolved gases in transformer dielectric oil is often the best method of detection. Dissolved gas analysis iec 60599 for many years the method of analysing gases dissolved in the oil has been used as a tool in transformer diagnostics in order to detect incipient faults, to supervise suspect trans. It contains recommended procedures for sampling, recommended actions based on interpretation of results, and a bibliography of related literature. Block diagram of combine dissolved gas analysis dga method. The first allows the hydrogen concentration to be measured at intervals of. Dissolved gas analysis dga of transformer oil is one of the most effective power transformer condition. The use of dissolved gas analysis dga to monitor the inservice behavior of transformers is discussed. Dissolved gas analysis is a sensitive technique to detect the fault of oil in transformer oil. Transformer oil gas analysis automated sample handling with optional hss sampler. Transformer oil analysis tests identify whether the insulating properties are acceptable by measuring degradation and contamination of the oil.
H2, o2, n2, co, co2, ch4, c2h6, c2h4 and c2h2 are analyzed. Improved consistent interpretation approach of fault type. Dissolved gas analysis of oil in load tap changers. This guide is intended for the application of dissolved gas analysis dga techniques on oilimmersed transformers and reactors applied during factory temperature rise tests. Gray transformer chemistry services introduction the fault free operation of power transformers is a factor of major economic importance and safety in power supply utilities and. Analysis of transformers mineral oil by using dissolved. In substation, transformer is the most efficient and costly equipment.
In this method a sample of the oil is taken from the unit and the dissolved gases are extracted. Dissolved gas analysis in power transformer using artificial neural network. Astm d3612 dissolved gas analysis gas analysis is based upon the fact that both electrical insulating oil and cellulosic insulation break down under abnormal thermal or electrical stress. And, if an abnormality is found with the oil sample, this. Practical experience gained from dissolved gas analysis at an aluminium smelter ian. Contribution to the improvement of the dissolved gas analysis. The distribution of these gases can be related to the type of electrical fault, and the rate of gas generation can indicate the severity of the fault. Dissolved gas analysis dga is the study of dissolved gases in transformer oil insulating materials within transformers and electrical equipment break down to liberate gases within the unit. Dakshin transformer oil multi stage gas extractor dtomget model. Dissolved gas analysis dga dissolved gas analysis is the study of dissolved gasses in transformer oil.
Gas in oil of the dga method is a sensitive and reliable technique for the detection of incipient fault condition within oilimmersed transformers. Experimental investigations on the dissolved gas analysis method. To improve diagnosis accuracy, this paper presents a new transformer fault diagnosis method based on deep belief networks dbn. The transformer s fluid not only serves as a heat transfer medium, it also a part of transformer s insulation system. Much in the same way that a doctor can analyze a patients blood to determine certain. The results of these stresses are both volatile and nonvolatile gases, known as. Power transformer fault severity estimation based on dissolved. Development of the diagnostic tool dissolved gas analysis and marketing activities for condition assessment of power transformers title swedish abstract the possibility of using a mass spectrometer as detector for dissolved gas analysis was investigated and a website for the abb transformers diagnostic group was created. An online monitoring system is adapted to the ct and the data is evaluated under standard diagnostic techniques. Abstract this paper presents a program development for an analysis of power transformer oil testing results. Dissolved gas analyzer serveron tm1 single gas online.
Dissolved gas analysisan early identification of faults in. Dissolved gas analysis dga is widely accepted powerful tool in diagnosing power transformer health condition. Criteria successfully developed for transformers are not readily applicable to cables because of significant differences in the design and operating characteristics of both systems. The gasses obtained from the degradation of the materials from the container of the transformer oil.
Then the extracted gases are separated, identified, and quantitatively determined. It is a costeffective approach that can be used to detect problems in the early stages and manage them as the condition evolves. The removal of the gases from the oil can be accomplished by various methods. Dissolved gas analysis dga is used to determine the faults occurred in. Dissolved gas analysis dga of transformer powerlink oil. Dga results of oil samples drawn from transformers of different. Hydrogen can be formed by a chemical reaction with the breakdown of water reacting with the zinc coating of the fitting. Applying dissolved gas analysis to distribution transformers white paper scope dissolved gas analysis dga is an important tool in the assessment of a transformers operating condition.
A wide variety of transformer oil dissolved gas analyzer options are available to you, such as usage, power. Dissolved gas analysis will be performed, when we suspect a fault, or. It is therefore prudent to periodically perform tests on the oil. Along with the oil sample quality tests, performing a dissolved gas analysis dga of. Power transformer fault severity estimation based on dissolved gas analysis and energy of fault formation technique. In this paper, authors address the analysis of the dissolved in oil gases in an oilimmersed 69kv 1200600. The parameters that are most used to assess the health status of power transformers are dissolved gas analysis dga, oil quality analysis oqa and content of furfuraldehydes ffa in oil. Unfortunately, this is typically done once or twice a year and can take up to two weeks for results. Product information dissolved gas analysis and supervision. The method is interpreting the transformer condition. Dissolved gas analysis dga is one of the most powerful tools asset managers have to determine the health of their transformers. The interpretation should be left to a specialist and his advice and recommendations should be followed. By combining various dga techniques and interpreting classical dga with fuzzy logic system approach, we have increased the predictability of.
Pdf dissolved gas analysis dga of transformers can provide insights into thermal and. This method is generally used to determine transformer condition and failure causes by analyzing quantities of combustible gases in oil. In addition, dissolved gases are extracted from the oil sample, separated, and quantified in a gas chromatograph. The interpretation of transformer oil gas analysis is still an art and not an exact science. Practical experience gained from dissolved gas analysis at. Partial discharge therefore would be worthwhile to be detected early for technical intervention. Interpretation of dissolved gas analysis in transformer oil using fuzzy logic system. There is a general agreement that in service conditions the quality of mineral. In case of a manual operating mode, the oil samples are first injected into a vacuum. In this paper, based on firstprinciples calculations, a novel 2d material, pddoped mose 2 pdmose 2 monolayer, is explored as gas sensor or scavenger for detection or removal of typical gases in transformer oil, including h 2, co and c 2 h 2. The parameters that are most used to assess the health status of power transformers are dissolved gas analysis dga, oil quality analysis oqa and. Dissolved gas analysis dga, initially developed for the monitoring of transformers, was recently introduced for inservice diagnostics of power cables. Dissolved gas analysis in transformer oil using pd.
In the experiment proper, we considered only the acidity, whose concentration in the transformer oil increases with aging if the transformer, moisture, and a suitable impurity. Specifications for transformer online dissolved gas analyser dga 1. The dissolved gas analysis has been widely used by utilities throughout the world as the primarily diagnostic tool for transformer maintenance. The dga will require the removal of an oil sample from the transformer and this can be done without deenergization of the transformer. Detects most internal faults, some external faults and some operational errors. Specifications for transformer online dissolved gas. Dissolved gas analysis guide for transformers filled with. The gas in uid is analysis refers to the dga method. Development of the diagnostic tool dissolved gas analysis. Gases generate by degradation of fluid or cellulose. Thus, by merging thermal stress in paper and oil, the resulting thermal fault. The oil sample is analysed in the laboratory using gas chromatography technique. So in order to protect from faults, transformer oil testing is required. A galvanized zinc coated fitting plus high moisture will form h2 in a dga sample and drain valve of unit.
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