Once you decide to dispose of the transformer, you are no longer required to assume that it is a pcb transformer. Avoid sampling from the absolute top or bottom of reservoir. What is the normal frequency of transformer oil sampling. Astm d923, method of sampling electrical insulating oil from a transformer differences between dissolve gas analysis with mineral oil and with beta fluid gas solubility. Transformer chemistry servicestcs po box 1265, westville. Practice procedure of transformer oil sampling iec 60475 procedure of oil sampling in aluminum bottle the aluminum bottle is used for oil analysis in general and for analysis of compounds which are sensitive to light such as peroxide and furfural. Dissolved gases astm d 3612, iec 60567, dissolved water astm d 1533, iec 60814 the following is one of the procedures to collect transformer oil sample. Pull the oil sample from the same relative location in the reservoir. Lowcost, simple and one of the most commonly used methods of oil sampling. The first is to ensure that the proper sampling procedure is followed, and the second is to ensure that all of the essential information is properly recorded. Reason of analysis routine or other transformer nonenergized, offload energized or on load oil temperature when sampling humidity. Safely dispose the oil at the end of the work or store it in another sealed container to be disposed according to environmental standards.
To ensure good data density and minimum data disturbance in oil sampling, the sampling procedure, sampling device and sampling location should be considered. The procedure by which a sample is drawn is critical to the success of oil analysis. Oil condition and dissolved gas analysis to be noticed at sampling. Sampling of oil received in bulk container should be taken one sample for each container. Dissolved gasin oil analysis the most important test that can be done on the liquid insulation of a transformer is an annual dissolved gas analysis dga.
If regularly conducted, oil analysis allows identification of specific fault conditions that may be developing. These practices apply to liquids having a viscosity of less than 6. Start the oil pumps of the cooling system, if applicable. Fit a suitable adapter 5 with nozzle 4 in the sampling point 6. How to take a good oil sample how to take a good oil sample how to take a good oil sample how to take a good oil sample vacuum extraction method this sampling method uses a vacuum extraction pump to sample nonpressurized systems. Dissolved gas analysis guide for transformers filled with.
Remove the plug from the sampling point and fit adapter. Our original goal was to compile a comprehensive reference book of common inservice oil analysis techniques to help readers understand and choose the right technique and. Oil sampling and analysis north vancouver facility we are pleased to submit the insulating fluid report and test sheets for the three 3 transformers and one 1 ocb located at the north vancouver facility. This reaction is accelerated by exposure to light, therefore sampling devices made of transparent materials i. D4006 test method for water in crude oil by distillation api mpms chapter 10. Label this point as the oil sampling point, so that all future samples will be taken from this point. Page 8 of 8 reference sp0504r01 ver 1 reference owner. Transformer oil sampling in vr digital engineering and magic. As the name implies, this test analyzes the type and quantity of gases that are dissolved in the transformer oil. Standard practice for manual sampling of petroleum and.
Remove shield from outlet sampling point 6 of a transformer. C pull the oil sample from the same relative location in the reservoir. The collection of transformer oil samples according to the following procedure for d. Let the oil circulate for about 30 minutes before sampling.
It is recommended to send duplicate oil sample from the same transformer in order to make the process of testing become faster. This procedure has some difficulties and must pass in accordance with the established requirements. Sampling transformer oil, pcb oil under pressure from head of oil spillage skin irritation, environmental harm low 4 power transformer dc. In general, use this method for geared compartments. Perhaps, the easiest way to explain the reasoning for proper transformer oil maintenance is to compare a transformer to a car. The essential purpose of dissolved gas analysis is to detect. White paper maintenance inspection windows on transformers oil sampling ports can also be brought outside of the transformer cable compartment with several vendors offering retrofit kits that permit safe sampling as well as providing an optional external pressure gauge and nitrogen insert to relieve vacuum. An oil sample tube and syringe is used to draw, retain and transport the oil sample in the same condition as it is inside a transformer with all fault gases dissolved in it. Provide an active learning method for electrical utilities workers on how to perform a transformer oil sampling procedure. It is important to use a new piece of tubing for each sample.
Attach a piece of plastic tubing 3 to the nozzle 4. Oil sampling is done during the process of oil filtration and if sample result for dielectric strength and moisture comes under limit then filtration of oil is stopped. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. When predictive maintenance transformer and oil tests has disclosed a serious problem of moisture, combustible gas andor oil decay products, and on site purification is the chosen procedure the following steps are suggested. Start with a clean dry bottle to store the transformer oil.
Just as a car requires regular checks of both oil quality and oil level, a transformer requires the same proactive treatment. Given that often the oil used in factory tests is not the one purchased or. The color is not in itself an indication of any specific problem, but a dark color is usually an indication of aged andor contaminated oil. Transforer oil sampling guideline the first and most important step in the testing procedure is securing a good representative sample. An internal fault in a transformer can be discovered earliest using this test method. A full and comprehensive sampling method is found in astm d36, standard test. This test can give an early indication of abnormal behavior of the transformer. News transformer oil sampling training by txmonitor november 22, 20 transformer oil sampling glass syringe and stopcock how do you sample your transformer oil. C avoid sampling from the absolute top or bottom of reservoir.
The color of transformer oil changes from light yellow to cloudy brown under the influence of temperature, contaminants and electric current. Draw out sufficient oil to fill the bottle three or four times. Sampling electrical insulating oil for laboratory analysis requires care to ensure that the sample is representative of the product being sampled. It is vital that the sample be drawn quickly, placed in a tightly sealed container and tested as soon as possible. Transformer oil reservoir must be under positive pressure. Position the oil processing and filling unit at the cleared area besides the ransformer. Oil samples should be taken from the sampling valve at the bottom of the tank. Randomly check sampling of oil received in drums in different palettes. Astm d117 18 standard guide for sampling, test methods.
This method has been shown by practice to give a reliable indication of the presence of hydrophilic compounds. Iec 60475, method of sampling liquid dielectrics iec 60628, gassing of insulating liquids under electrical stress and ionization iec 60666, detection and determination of specified antioxidant additives in insulating oils iec 60814, insulating liquids oilimpregnated paper and pressboard determination of. Taking oil sample from power transformers dissolved gases astm d 3612, iec 60567, dissolved water astm d 1533, iec 60814 the following is one of the procedures to collect transformer oil sample. Job safety analysis power transformer testing check this is the latest process zone version before use. Testing consists of measuring breakdown voltage and. How to take a good oil sample how to take a good oil. Procedures for drawing transformer oil samples power consultants. Transformer oil sampling and its further analysis is an important part of maintenance, resulting in proper operation of power equipment. Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. Figure below shows transformer oil filtration unit. Testing sequences and procedures are defined by various international standards, many of them set by astm. Sample the oil only when the transformer is warmer than the surrounding air to avoid condensation of moisture on the oil.
Description demonstrates correct procedure for taking an oil sample on liquid filled power transformers. Hiend virtual reality training, compatible with the latest and most advanced vr platforms with no limits to when and. Testing of power transformers seems like a similar experience. The first and most important step in the testing procedure is securing a good representative sample. Rain, high humidity, or blown dust may seriously affect the quality of the sample. Transformer oil analysis basic introduction by n robinson, wearcheck as blood tests disclose ones state of health, so oil analyses disclose the condition of a transformer. Newly installed transformers should be sampled frequently within the first 12 months i. Vacuum pumps can be used with dipstick retaining tubes and other nonpressurized system points, such as installed sampling valves, oil. Transformer oil analysis testing service for monitoring the condition of transformer oils routine testing of transformer insulating oil is an essential maintenance function that ensures a safe working environment and helps eliminate the possibility of disrupted production resulting from a transformer failure or explosion. Standard practices for sampling electrical insulating liquids.
Transformer oil testing is a proven loss prevention technique that should be a part of any condition based predictive maintenance program. Oil filling and filtration of oil is carried out simultaneously. Make sure that the hose from the transformer is made of pvc, new, and clean. A car requires oil for lubrication while a transformer requires oil for insulation and cooling. This early warning system can allow management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. In this book we have laid down important aspects on transformer.
White paper maintenance inspection windows on transformers. Usmc sniper legend carlos hathcock his own words complete 1993 interview. Transformer oil maintenance electric energy online. Sampling procedures should be documented and followed uniformly by all members of the oil analysis team. For this sampling method, variations can sometimes be seen at different locations in the reservoir. Transformer oil testing by robert turcotte, manager, electrical loss control the hartford steam boiler inspection and insurance company the value of transformer oil testing transformer oil testing is a proven loss prevention technique which should be a part. Connect the transformer and the sampling kit valve top with. If a proactive approach is adopted based on the condition of the transformer oil, the life of the transformer can be extended. Sampling instructions transformer oil quality plastic bottle 1 fill the bottle before sampling with the syringe.
Note that approximately 1015% in terms of weight of the oil used for factory tests before transporting the transformer to the operating site remains inside the transformer adsorbed by the solid insulation and deposited on the inner surfaces even after it being emptied before transporting it to the final site. Sampling of transformer oil by syringe as per iec 60475. After the first year, an annual dga test should suffice. It has been a few years since the publication of the first edition of spectro scientifics inservice oil analysis handbook. Basics, maintenance, and diagnostics ix contents continued page 6. Transformer testing has developed considerably over the past years. All connection areas between the transformer side and the glass syringe, including the drain valve, must be super clean. If the sample is to be sent to a test house for testing, the test house should advise on the information needed, as well as the volume of the sample and the type of container to use. Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance pr ogram. If the transformer is not going to be placed on operation immediately, it must be stored indoors and. The following is one of the procedures to collect transformer oil sample. Therefore, the following actions are recommended and should be practiced. Product information sampling for oil condition test and dissolved.
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