Bdv test of transformer oil procedure pdf download

They can now be applied to transformers filled with beta fluid. The significance of the test it will detect free water, dirt and conductive particles. Bdv test is an very important testing procedure for the insulation oils in transformer. 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. To determine dielectric strength, transformer oil is periodically tested by means of an oil punching apparatus. From my experience, untreated, raw transformer oil has to withstand 40 kv per 2. Astm d1816 standard test method for dielectric breakdown voltage of insulating oils of petroleum origin.

Low value of bdv indicates presence of moisture content and conducting substances in the oil. The different insulating materials have different dielectric strength. 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. Once power transformer is charged and commissioned, transformer oil. Mineral oil is the most common insulating fluid and has been in use since the late 19th century. Carry out the statutory transformer oil test onsite.

Pdf dielectric strength measurement is the most primitive test which decides the health of. The insulating material should sustain the voltage up to its dielectric strength. Transformer spare part and transformer oil bdv test kit. Peaobdvmxxx automatic oil breakdown voltage tester features available in 100kv m100, 80kv m080 and 60kv m060 versions. Testing consists of measuring breakdown voltage and other physical and. The dielectric strength of transformer oil is also known as the breakdown voltage bdv of transformer oil. Transformer oil testing quick, simple and onsite b2hv. A low value of bdv indicates presence of moisture content and conducting substances in the oil.

Keywordsautomation using a rduino, oil breakdown voltage. Adjust the electrode distance inside the oil cup with standard gauge. When transformer is to be filled or topped off in the field, they must be filled under vacuum according to specific instruction. 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. The bdv of oil in transformer is 60 kv1 min within the gap of 2. Parameters of transformer oil the parameters of transformer oil are categorized as, electrical parameters. The miminum bdv for transformer oil in service is 30kv for 1 minute at an electrode gap of 2. Testing sequences and procedures are defined by various international standards, many of them set by astm. The dielectric strength of an oil still ranks as the most common field test. Worlds only true bdv setmeasures hv secondary voltage across oil vessel electrodes, instead of across hv primary. We have nabl approved transformer oil test laboratory and render our service on short calls as and when required by you with our expert comments and suggestion promptly. The middle layer is a processing device which process the. Now lets move to, transformer oil purification procedure.

Keywordsautomation using arduino, oil breakdown voltage. Transformer oil used are normally tested using astm d87782 with the kv strength testing,using 1 electrode spaces 0. Specific transformer oil test method availability will vary depending upon location. 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. Transformer oil filtration system aditya engineers duration. Meggers automatic laboratory oil test sets perform accurate breakdown voltage tests on mineral, ester and silicon insulating liquids.

The oil shall be thin enough to penetrate into narrow ducts and assist in the circulation through transformer winding to prevent local over healing. Before filling oil in transformer through filter machine, it has to be filtered separately in oil tanks and ensure bdv and ppm value. Lowcost manual instruments are still available, but think. Test parameters transformer oil testing laboratory. 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. During filtration, temperature of oil must remain within 60. Transformer is one of the main asset in the electrical power industry which needs to be maintained for guaranteed uninterrupted power transmission in order to get assured revenue benefits. It is an optional component in high vacuum transformer oil filtration machine which is provided if the customer demands it. The vessel was cleaned thoroughly and filled with sample oil until the level is about 12mm from the top. Due to the ultra fast voltage switchoff at flash over transformer oil testing of synthetic oil, ester oil and silicone oil is possible. A dga test will indicate high thermal gases methane, ethane and ethylene as a result of overheating of the liquid. Insulating oil of transformers and current transformers fulfills the purpose of insulating as well as cooling. Predicted oil bdv size of testing set samples prediction accuracy 1 96.

Ots100af, ots80af and ots60af laboratory oil testers. For measuring bdv of transformer oil, portable bdv measuring kit is generally available at site. Transformer oil analyst software, the fault condition of the transformer can be diagnosed. Keeping the requirements of customers in mind, we keep providing latest and the most advantageous products for our customers. 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. Various predefined and fully automatic test sequences meet all relevant international standards, thus the models of the ba series fulfill all legal requirements of the mandatory.

Connect the earth terminal on the right side of the equipment to the earth wire firmly before start the equipment. Pdf significance of transformer oil testing researchgate. If the technique of dissolved gas analysis is excluded, oil tests can be divided into two basic groups. Requires 1 litre of oil in a polyethylene container. There are many mineral oil filled transformers that have been in continuous use for more than 50 years. In this kit, oil is kept in a pot in which one pair of electrodes are fixed with a gap of 2. Transformer oil break down voltage bdv cr4 discussion. The transformers oil shall be of low viscosity and shall offer the minimum resistance and maximum convective assistance to the flow. The cleaned magnetic stirrer bar as dropped to the vessel so that it is placed at center. Transformer oil breakdown voltage gives an indication about the. 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. The mounted electrodes were separated from the container.

Bdv tests is used to test the dielectric strength of the transformer. For measuring bdv of transformer oil, bdv measuring kit is used. To test the oil sample, transformer oil is poured into a porcelain vessel in which two disk electrodes, one of 8mm diameter and one of 25mm diameter, are mounted. Breakdown voltage is measured by observing at what voltage, sparking strands between two electrodes immersed in the oil, separated by a specific gap. Moulded test vessels give repeatable results with lock in precision electrode gap setting adjustment wheels.

The megger ots range of dielectric breakdown voltage test sets. Dissolved gas analysis guide for transformers filled with. The electrodynamics processes motivate an evolving ionizing electric. Transformer oil breakdown voltage testing procedure. The megger guide to insulating oil dielectric breakdown testing. Pdf development of an automated break down voltage test set.

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. As the name implies, this test analyzes the type and quantity of gases that are dissolved in the transformer oil. Basics, maintenance, and diagnostics ix contents continued page 6. Transformer oil reservoir must be under positive pressure. Nabl accrediated transformer oil testing lab transformer oil test labnabl nabl accredited testing laboratory as per isoiec 17025. Any failure to the transformer can extremely affect the whole functioning of the organization. The positive li bdv test was conducted for both oil and developed nfs.

Overheating of the liquid insulation is a slightly different problem in transformers and can be on of transformer oil testing methods. This test can give an early indication of abnormal behavior of the transformer. The transparent, shielded lid and large test chamber enable easy access to the test vessel. Transformer oil test methods include astm, bs,and other recognized transformer oil analysis testing procedures. Testing sequences and procedures are defined by various international. Break down voltage test of transformer oil duration. In case bdv and ppm values are not achieved within 7 days, check the.

Using a combination of these diagnostic tests allows the oil to. From the experiments, the heating procedures resulted in the production of toxic gases. Based on the procedure above breakdown voltage of an oil sample is determined six times in a row and the. The megger guide to insulating oil dielectric breakdown. Transformer oil received in drums must be stored on an elevated platform. Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry. Transformer oil purification filtration processprocedure. Testing consists of measuring breakdown voltage and. Your test results are well above the mimimum requirement. 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. 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.