Bdv test of transformer oil procedure pdf file

Insulation resistance test and oil test of distribution transformer. Collect the oil sample of transformer oil from the bottom valve of the transformer. The megger ots range of dielectric breakdown voltage test sets. Testing sequences and procedures are defined by various international. Peaobdvm series of automatic oil breakdown voltage testers are highly precise instrument, which can be used to conduct either a breakdown voltage test or do a proof withstand test. Keywordsautomation using arduino, oil breakdown voltage. Transformer oil breakdown voltage bdv test youtube. It is fully automatic test kit developed to test oil sample as per is6792iec 60156 with printer facility. Transformer oil used are normally tested using astm d87782 with the kv strength testing,using 1 electrode spaces 0. Because a test confirms what you know, if you can apply in real life what you have learned in a classroom, under strict, rigorous and controlled conditions. This oil shall also make an important contribution to the efficiency of the solid insulation by penetrating into and filling the spaces.

Adjust the electrode distance inside the oil cup with standard gauge. The middle layer is a processing device which process the. If this is not possible, the transformer has to be placed in a dry place and the transformer must be filled with oil. A new transformer oil shol\uld have at least dielectric strength of 39 kv as per british standards.

The megger guide to insulating oil dielectric breakdown testing. The test result enables plant operators to evaluate the condition of the insulating oil, allowing them to assess on the need for substitution of the oil. Break down voltage test of transformer oil duration. After filling the oil up to the top of the transformer core, maximum suitable vacuum is maintained above the oil level in the tank to minimize the hazard of bubbles lodging in the inaccessible corners of winding. It is really nice video to know the test done in the lab. The automatically generated test reports are provided in pdfformat and are stored on a usb stick. What is the minimum value of breakdown voltage of transformer. On a regular schedule, it must be subject to an oil test to determine its breakdown voltage the oil test is essential and in most countries even mandatory, since the dielectric oil deteriorates in its isolating and cooling qualities due to ageing and pollution by dust particles or. Maintenance and repair of medium power transformers.

Oil testing capabilities doble engineering company. Before attempting to draw the sample identify the type of cooling liquid in the transformer. Basics, maintenance, and diagnostics ix contents continued page 6. After a transformer has been received at its final destination, it is advisable to put it full of oil on its permanent place, even if it is not going to be placed in operation immediately. How to calculate the the bdv value of a power transformer.

A new transformer oil shol \uld have at least dielectric strength of 39 kv as per british standards. What is the minimum value of breakdown voltage of transformer oil. The automatically generated test reports are provided in pdf format and are stored on a usb stick. Connect the earth terminal on the right side of the equipment to the earth wire firmly before start the equipment. The equipment required for this test is a 100 w lamp with socket and an extension cord for connection to a 120 v 60 hz power supply, with which three test procedures are completed. Bdv of 50 kv and above is considered good for operation while 60kv and above means the oil is in excellent condition when gap between terminal during bdv test is 2. Bdv test is an very important testing procedure for the insulation oils in transformer. A transformer oil breakdown test set is an equipment that measures the dielectric strength of the oil. A dga test can identify an overloaded transformer by a test result showing high carbon monoxide, high carbon dioxide, and in extreme cases, even elevated methane and ethylene. Check the bdv of transformer oil and new oil from oil drum. If lower values are recorded do not energize the transformer and the oil is recommended for filtration.

So, insulation overheating measurement is also transformer oil testing methods. Veer make oil bdv is specially designed for testing oil breakdown voltage. You can also choose from electronic, hydraulic transformer oil tester there are 687 suppliers who sells transformer oil tester on, mainly located in asia. Dec 27, 2019 the transformer oil is used in the transformer for insulation as well as for cooling purpose. Liquidfilled transformer instruction and maintenance manual. The different insulating materials have different dielectric strength. What is the bdv breakdown voltage of a 33kv transformer. Pdf dielectric strength measurement is the most primitive test which decides the. Dissolved gas analysis is the single most important test performed on oils from transformers. Minimum standard specific resistance of transformer oil at 90c is 35. For veryfication of oil purity every year to be checked the bdv breakdown voltage,we have take out the transformer oil in the transformer and collect in the high voltage kit inthe kit two stem will be there within the 2mm gap and then apply the high. Based on the procedure above breakdown voltage of an oil sample is determined six. Free electricity generator 220v cfl energy light bulb new ac electric generator 2019 new experiment duration.

Breakdown voltage of the transformer oils under certain conditions. Study of transformer oil purification shreya salvi, prof. Breakdown voltage is an important test for transformer oil. All data can be downloaded either as adobe pdf or in text format by email for import into the delta x transformer oil analyst program, or databases such as. It is important to maintain an optimum temperature in a transformer to sustain a safe balance between the moisture content in paper and oil. Heating and filtering of insulating transformer oil and filling shall be performed as per manufacturers recommendations.

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. Conclusions inhibited and naphtha based transformer oil can be considered as most suitable. Jan 23, 2017 breakdown voltage bdv testing of transformer oil. Jul 17, 2017 test the transformer insulation and look for signs of shorts or damaged windings. Ots100af, ots80af and ots60af laboratory oil testers. Requires 1 litre of oil in a polyethylene container. Break down voltage is measured by observing at what voltage, sparking. 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. Study of transformer oil purification ssrgjournals. Bdv test is used to test or check the quality of transformer oil. Meggers automatic laboratory oil test sets perform accurate breakdown voltage tests on mineral, ester and silicon insulating liquids. Total amount of transformer oil used for analysis in the test apparatus is of 60 ml.

Power transformers in india transformer manufacturer in india. 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. Dry and clean oil gives bdv results, better than the oil with moisture content and other conducting impurities. Procedures for drawing transformer oil samples general sampling electrical insulating oil for laboratory analysis requires care to ensure that the sample is representative of the product being sampled. Transformer oil testing quick, simple and onsite b2hv. Carry out the statutory transformer oil test onsite. If the transformer loses pressure again with no change in temperature sunbelt transformer should be contacted immediately. The test cell shall be of glass or plastic and transparent and nonabsorbent eg. If everything checks out, drain the transformer oil.

The various combinations of samples ideal sample along with natural dust and saw dust are evaluated for flash point and fire point values in the closed cup are shown in table 2. This is the test of dielectric strength of transformer oil. Bdv breakdown voltage of transformer is basically the strength or voltage upto which the transformer oil can resist the breakdown of its dielectric properties. It is intended to use this oil as an electrical insulation and oil as coolant in applications such as transformers, reactors, tap changes, switchgear, oil filled capacitors etc. This is because the contamination particles resulted from the insulation deterioration in the transformer oil decrease the bdv value. This value tells the voltage upto which the oil doesnt. Lowcost manual instruments are still available, but think. Astm d1816 standard test method for dielectric breakdown voltage of insulating oils of petroleum origin.

Breakdown voltage bdv testing of transformer oil youtube. What is the bdv value of distribution transformer oil. The transparent, shielded lid and large test chamber enable easy access to the test vessel. At first we appling the voltage diff gradually, the voltage near which the oil looses its insulation property, that voltage is called bdv.

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 like naohaq. After the transformer oil test is completed, the insulation oil is stirred automatically and the test sequence is performed repeatedly. Transformer oil purchase specifications developed under the auspices of the doble oil committee march, 2017 composition this specifications covers new insulating oil for general applications for liquidfilled electrical equipment, which are manufactured from mineral crude, which may be either naphthenic, which has a very low naturally. It tells about the purity of the transformer oil which is mostly degreaded by moisture. Pdf development of an automated break down voltage test set. Maintenance and repair of medium power transformers wapic, lagos, nigeria, 27. If regularly conducted, oil analysis allows identification of specific fault conditions that may be developing. Same nine samples were investigated for acidity value by means of.

This explains the high correlation presented between ir and oil bdv. Insulating oil of transformers and current transformers fulfills the purpose of insulating as well as cooling. The sample is taken in electrolysis pot and applied a voltage diff between anode and cathode of the pot, the diff between the two plate is 2. As the insulating materials in a transformer break down due to thermal and electrical stresses, gaseous byproducts are formed.

Aug 30, 2019 bdv is an important and popular test of transformer oil, as it is the primary indicator of the health of oil and it can be easily carried out at the site. Water content 6 maintenance and repair of medium power transformers. Bdv tests is used to test the dielectric strength of the transformer. The objective is to get as much of the old oil out as possible. In this paper, we will study about the transformer oil filtration machine and how it purifies the contaminated transformer oil. 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. For educational purposes only, under proper supervision of laboratory professionals video edited by. For measuring bdv of transformer oil, bdv measuring kit is used. Higher the moisture in the oil, lower will be the bdv for transformer oil.

Methyl methacrylate vessel with effective volume between 300 to. 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. The megger guide to insulating oil dielectric breakdown. Jun 28, 2019 eight studies make arrangements to visit the freeburg early childhood program in east waterloo, operated. The dielectric strength of an oil still ranks as the most common field test. Moulded test vessels give repeatable results with lock in precision electrode gap setting adjustment wheels. For a new sample of oil the breakdown voltage of transformer oil is 30kv and. How to proceed the dielectric strength test for transformer oil. An oil test can be performed quickly and economically, as the testers can be taken onsite and therefore no oil sample needs to be shipped to a test laboratory. It is done for checking the dielectric strength of the oil of the transformer. Pdf significance of transformer oil testing researchgate.

For a high voltage pulse power supply of 140kv amplitude, rise time 1usec, fall time 1usec, pulse width 6 usec and prf is 10 hz. The iec standard procedures used to test the insulating oil. Breakdown voltage testing of oil is one such means to detect the voltage at power frequency at which it is likely to cause a flashover. The relays checking and calibration procedures are not covered in this document.

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 of any conditionbased predictive maintenance program. The byproducts are characteristic of the type of incipientfault condition. The transformer oil under test is subjected to an ac electric field with continuously increasing voltage till the oil breaks down. The transformer should be pressurized with 24 psi positive pressure of 99. Transoilchecktm monitors the condition and change in transformer oil quality, helping to identify potential transformer. Transformer spare part and transformer oil bdv test kit.

Testing consists of measuring breakdown voltage and other physical and. Transformer oil breakdown voltage testing procedure. This early warning system can allow management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. The test results of bdv test and ift test can associate errors as the average value of the test is taken to account. Remove a sample of insulating transformer oil in accordance with astm d923. A wide variety of transformer oil tester options are available to you, such as auto testing machine, strength testing machine, and universal testing machine. Breakdown voltage bdv in transformer oil powerlink oil. Dec 16, 2017 bdv breakdown voltage value above 30kv is considered good. Transformer oil testing is a proven loss prevention technique that should be a part of any condition based predictive maintenance program. This is usually performed in order to understand the nature and durability of a transf. Testing of power transformers seems like a similar experience. Pdf file text and xml file measurement of oil temperature bluetooth and usbconnection printout of test results pc software ba control center manage up to 4 bas from your pc simultaneously start the test sequence remotely from your pc create user defined test sequences and implement them via bluetooth or usb. Keep the oil pot in open air for 5 minutes so that air bubble if any gets out. Dielectric strength means the maximum capacity to withstand voltage of insulating oil.

Flushing and vacuum of transformer tank shall be performed as per manufacturers recommendations. From the test results it shall be identified that acidity content is high for degraded oil. Transformer oil analyst software, the fault condition of the transformer can be diagnosed. Dec 15, 2016 for educational purposes only, under proper supervision of laboratory professionals video edited by. The significance of the test it will detect free water, dirt and conductive particles. Series fot fully automatic transformer oil bdv tester. If the technique of dissolved gas analysis is excluded, oil tests can be divided into two basic groups. During the transformer operation for a period, insulation oils will become dirty degradation which results in loosing function of the oil in transformer as insulation and cooling, in that case, transformer will face some serious problems. The oil testers by b2hv are of compact design and portable ba75 oil tester. Series fot fully automatic transformer oil bdv tester is applied to test the insulating oil s dielectric strength breakdown voltage value, which is designed as per the requirement of iec60156 testing method of insulation oil medium strength, which via proper programming, has got functions of auto boosting, step down, stirring, display and print out. During the time of transformer operation, the oil will become degradation which may be the main cause for loss of function, decreasing the cooling capacity of the transformer, and etc. It is an optional component in high vacuum transformer oil filtration machine which is provided if the customer demands it. In such case bdv of oil is improved by reducing water ppm in oil through filtration. Degasification, insulating oil, moisture, purification, transformer.

The acidity level of transformer oil is measured as per british standard bs2000 part 1. Bdv is an important and popular test of transformer oil, as it is the primary indicator of the health of oil and it can be easily carried out at the site. The idea of this document is to give guidelines to the maintenance personnel of. Also, bdv can be an indication about the deterioration state of the insulation system in the transformer. Mineral oil is the most common insulating fluid and has been in use since the late 19th century. During oil filling in the main tank of the transformer, it is preferable to connect the inlet hose pipe at the bottom of the tank. This test shows the dielectric strength of transformer oil. Once the oil is drained, proceed with flushing out the inside of the transformer. The transformer oil testing device measures and reports the root mean square value of the breakdown voltage.