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. This test can give an early indication of abnormal behavior of the transformer. Breakdown voltage value of insulating oil of the transformer. Introduction transformer oil is one of the very important components in oil immersed transformers. The test cell shall be of glass or plastic and transparent and nonabsorbent eg. After breakdown of oil medium, hv break off will operate within 10 seconds to. It is also known as iovtinduced over voltage test, it is one of the routine test of transformers usually performed to check in turn insulations of the windings. 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. As part of routine testing regular oil testing enables comparative analysis over time.
The acidity level of transformer oil is measured as per british standard bs2000 part 1. Transformer insulating oil and types of transformer oil. Bdv tests is used to test the dielectric strength of the transformer. Motorized digital ots100ds kit and ots100 an analog motorized cum manually operated kit. Higher the moisture in the oil, lower will be the bdv for transformer oil. Transformer oil breakdown voltage testing procedure. Our transformer oil analysis lab can is capable of conducting the following tests. Bdv means breakdown voltage, also named as dielectric strength valve. Astm d117 18 standard guide for sampling, test methods, and.
So, insulation overheating measurement is also transformer oil testing methods. Destruction of dibenzyl disulfide in transformer oil lance. In this paper, we will study about the transformer oil filtration machine and how it purifies the contaminated transformer oil. Break down voltage test of transformer oil duration. When testing the quality of insulating liquids, you are able to decide, based on the results, whether the insulating effect of transformers makes it possible to. Transformer oil test sets analogue transformer oil test. 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. 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. It is done for checking the dielectric strength of the oil of the transformer. Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent. Test parameters test method ref standard 01 interfacial tension ring method is. Transformer oil analysis provides a highly accurate indication of the internal condition of a transformer. This method involves sampling the oil and testing the sample to measure the con centration of the dissolved gases. Transformer spare part and transformer oil bdv test kit.
Transformer what is bdv break down voltage test in transformer. What is the bdv value of distribution transformer oil. From my experience, untreated, raw transformer oil has to withstand 40 kv per 2. The megger guide to insulating oil dielectric breakdown testing. This oil shall also make an important contribution to the efficiency of the solid insulation by penetrating into and filling the spaces. Before attempting to draw the sample identify the type of cooling liquid in the transformer. Mineral oil is the most common insulating fluid and has been in use since the late 19th century. Transformer oil bdv test kit with iec standard is apply to test the insulating oil s dielectric strength, which is designed as per the requirement of iec165 testing method of insulation oil medium strength, which via proper programming, has got functions of auto boosting, step down, stirring, display and print out. If regularly conducted, oil analysis allows identification of specific fault conditions that may be developing. The user defined settings in this tester include calendar, sample number, stirring time and the number of.
From the test results it shall be identified that acidity content is high for degraded oil. 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. Methyl methacrylate vessel with effective volume between 300 to 500 ml. Tan delta test loss angle test dissipation factor test. After the transformer oil test is completed, the insulation oil is stirred automatically and the test sequence is performed repeatedly. Analogue transformer oil test set to check the integrity of insulating oil used in transformers, capacitors, xlpe cables and switchgear for safe operation and maintenance. 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. What is the minimum value of breakdown voltage of transformer.
The megger guide to insulating oil dielectric breakdown. As oil has to be broken down into very specific forms such as transformer oil, making sure it is still in the correct form is an essential process. Moulded test vessels give repeatable results with lock in precision electrode gap setting adjustment wheels. The user defined settings in this tester include calendar, sample number, stirring time and the number of tests is settable from 1 to 9 times. Careful recording of the oil of test samples and their comparison will help in anticipation of the impending trouble and adoption of the remedial measures. 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. On before take oil samples you should confirm the moisture particles removed are not. Transformer oil testing quick, simple and onsite b2hv. How to take transformer oil break down voltage test. Transformer and insulating oils are subject to electrical and mechanical stresses while a. Oil to be tested is placed in a cell containing one pair of electrodes placed with a gap of 2.
Oil suffers from electrical and mechanical stresses while electrical equipment is in operation. Going by knowledge and experience in this industry, i think here the question pertains to the break down voltage of transformer oil because on field or on papers whenever bdv of transformer is mentioned it is actually the. Breakdown voltage bdv in transformer oil powerlink oil. Gases generate by degradation of fluid or cellulose. This application note points to the precautions that need to be taken. As even highly deteriorated oil will pass the dielectric strength test of transformer oil if it is dry. The transformer oil is used in the transformer for insulation as well as for cooling purpose. Wait until 24 hours after completion of oil filling for power. Test records the manufacturer shall maintain test records for the tests carried out to establish conformity. Morgan schaffer pioneered dissolved gas analysis dga in america.
Conducted with the latest in precision measurement, testing, analytical equipment and instruments by leading multidisciplinary engineers and scientists, our testing services provide best practice and scientific. Breakdown voltage is an important test for transformer oil. Introduction there is not one single corrosive sulfur compound that is responsible for all corrosive sulfur issues that are present in all mineral oil filled electrical apparatus. That is why specific resistance or resistivity of transformer oil should get measured at 27 o c as well as 90 o c. This test shows the dielectric strength of transformer oil. The transformer oil testing device measures and reports the root mean square value of the breakdown voltage.
A transformer oil breakdown test set is an equipment that measures the dielectric strength of the oil. Degasification, insulating oil, moisture, purification, transformer. Transformer oil break down voltage bdv cr4 discussion. Dry and clean oil gives bdv results, better than the oil with moisture content and other conducting impurities. 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. 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. The electrical properties of oil can suddenly change due to changes in oxidation, acids, sludge gas and even water absorption, so thats why its essential to regularly test oil samples for. Connect the earth terminal on the right side of the equipment to the earth wire firmly before start the equipment. Veer make oil bdv is specially designed for testing oil breakdown voltage.
There are many reasons to do oil sampling and analysis as a core part of a preventative maintenance program and also during commissioning. When transformer is to be filled or topped off in the field, they must be filled under vacuum according to specific instruction. It is fully automatic test kit developed to test oil sample as per is6792iec 60156 with printer facility. Effect of dbds and dbpc on paper oil insulation of power. Same nine samples were investigated for acidity value by means of. Coconut oil as an alternative to transformer oil pdf. The area under your pulse should be less than this value. Ots series comes in three distinct models ots100a, a preprogrammed fully automatic kit. Jy6611 transformer oil breakdown voltage tester use advanced voltage breakdown control technology which will keep breakdown energy in a very low level,that will avoid pollution to oil sample during testing and make sure the test result are accurate and reliable. After this process, the humidity content of solid samples was less than 0. At first thing you maintain the electrical normsto take one sample from top of transformer and one from the bottom of transformer. Transformer oil testing is a cornerstone of an asset management program.
This guide describes methods of testing and specifications for electrical insulating oils of petroleum origin intended for use in electrical cables, transformers, oil circuit breakers, and other electrical apparatus where the oils are used as insulating, or heat transfer media, or both. Transformer oil surrounds and insulates the coil windings in highvoltage transformers. About 91% of these are testing equipment, 1% are other test instruments. A new transformer oil shol\uld have at least dielectric strength of 39 kv as per british standards. In addition there are contaminations caused due to chemical interactions with windings and other solid insulations, catalyzed by high operating temperature. The cable, winding, current transformer, potential transformer, transformer bushing, on which tan delta test or dissipation factor test to be conducted, is first isolated from the system. The standard test suites are designed for individual samples to deliver a routine set of oil analysis at low. During operation, the oil oxidizes and the oxidation products accumulate in the transformer oil. While taking sample of oil from transformer, sample bottle should be flushed well by transformer oil and oil in sample bottle should be vented properly so that atmospheric moisture could not ingress in the sample oil. Srcs transformer assessment package will tell you if. The automatically generated test reports are provided in pdfformat and are stored on a usb stick. In chapter three and four, an extended discussion on the transformer oil properties is made, taking into consideration the eleven most important ones.
Transformer oil bdv test kit with iec standard buy. Keep the oil pot in open air for 5 minutes so that air bubble if any gets out. The transition conditions are simulated in an indirectly heated test setup, which. Dissolved gas analysis for transformers international electrical. Transformer oil testing measurement of interfacial tension for ensuring the quality of transformers. Jan 23, 2017 breakdown voltage bdv testing of transformer oil. The insulating material should sustain the voltage up to its dielectric strength. Your test results are well above the mimimum requirement. What is the correct procedure for dvdf and hv test on.
Dielectric strength means the maximum capacity to withstand voltage of insulating oil. Megger and power factor windings, bushing and arrestors. 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. Oil test laboratories providing testing services transformer and switchgear manufacturers quality control of oil oil companies testing new oil during manufacture 5. Bdv test is an very important testing procedure for the insulation oils in transformer. Transformer oil testing for dielectric strength vessel preparation and elimination of the effects of moisture and contamination play a major role in successful oil testing. Meggers automatic laboratory oil test sets perform accurate breakdown voltage tests on mineral, ester and silicon insulating liquids. If lower values are recorded do not energize the transformer and the oil is recommended for filtration. 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. 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. What is the bdv breakdown voltage of a 33kv transformer. Bdv value of transformer oil pdf transformer oil, a type of insulating and cooling oil used in transformers and other electrical typically 5 repetitions, depending on the standard.
Some transformer oil tests can be carried out in the field, using portable test apparatus. Aug 30, 2019 transformer oil also known as insulating oil is a special type of oil which has excellent electrical insulating properties and is stable at high temperatures. About 0% of these are pathological analysis equipments. Keeping the requirements of customers in mind, we keep providing latest and the most advantageous products for our customers. 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. Dissolved gas analysis guide for transformers filled with. Our procedures allow for complete traceability from the time a sample is created using our online ms oil lims software until we produce your final test report. Transformer oil used are normally tested using astm d87782 with the kv strength testing,using 1 electrode spaces 0. The bdv test of transformer oil has a breakdown time of less than 10 milliseconds, a rise rate of voltage is 2 kv per second, and the kv indication appears in three digits. Transformer oil analysis bureau veritas commodities. Bdv test is used to test or check the quality of transformer oil.
Bdv is an important and popular test of transformer oil, as it is the primary indicator of the health of oil and it. Insulating oil testers bdv test of transformer oil. Gray transformer chemistry services direct evaluation the mechanical properties of insulating paper can be established by direct measurement of its tensile strength or degree of polymerization dp. Transformer oil bdv tester made in china transformer oil. A wide variety of transformer oil bdv test options are available to you, such as usage, power. Collect the oil sample of transformer oil from the bottom valve of the transformer. These properties are used to evaluate the end of reliable life of paper insulation. Pdf transformer is one of the vital components in power transmission and distribution system. These include the chemical and causes of the specific physical properties of the test oils.
The different insulating materials have different dielectric strength. The miminum bdv for transformer oil in service is 30kv for 1 minute at an electrode gap of 2. A wide variety of transformer oil bdv tester options are available to you, such as usage, power. Transformer testing, transformer oil analysis lab, transformer oil test lab, oil transformer test sl no. Transformer oil tests electrical engineering enersol. What is bdv break down voltage test in transformer. 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. The transparent, shielded lid and large test chamber enable easy access to the test vessel.
Much in the same way that a doctor can analyze a patients blood to determine certain health problems, the trained transformer owner can detect problems within the. A new transformer oil should have at lest a dielectric strength of 39 kv. Sep 24, 2017 with the help of transformer oil testing kit we can test transformer oil learn the process step by step. This manual is issued to help all the users to install and use ol dielectric strength procedure that you must follow to do dielectric strength tests, are referred to the iec voltage of isolating oils in new or used transformers, cables with oil, transformer oil testing is a proven loss prevention technique which should be a part of any. When you say bdv you might mean the dielectric strength of transformer oil. Then solid materials and oil were put in the ageing test vessel. What is the minimum value of breakdown voltage of transformer oil.
The above standard testing is offered in specific diagnostic suites designed to provide the maximum condition information on the transformers. Oil bdv tester ots series automatic oil bdv test sets. While the generic term oil is almost universally used to describe insulating fluids, there are currently five different. Insulation oil tester, gas dew point detection instrument. Transformer oil is used in oil filled electrical power transformers to insulate, stop arcing and corona discharge, and to dissipate the heat of the transformer i. Our 50 years of experience in transformer oil analysis guarantees precise and accurate analytical results. The life expectancy and satisfactory operation of transformers are mainly dependent on the oil in which it is used. For measuring bdv of transformer oil, bdv measuring kit is used. The transformer oil under test is subjected to an ac electric field with continuously increasing voltage till the oil breaks down. Labelling and marking as per the requirements of is 335. Npm services offers a full line of transformer diagnostic tests to determine the integrity and serviceability of insulating fluids. Depending on the oil, there can be tens to hundreds of different sulfur compounds present in the oil.
Moisture equilibrium and moisture migration within transformer insulation. 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. Worlds leading reclaimer of transformer oil over 1 billion gallons processed. What is bdv test for distribution transformer answers.
To determine dielectric strength, transformer oil is periodically tested by means of an oil punching apparatus. Power transformers, regulators, and reactors, ieee 62. How to proceed the dielectric strength test for transformer oil. Detects most internal faults, some external faults and some operational errors. For the purpose of bdv test, oil sample from transformer is taken in a sample bottle. Worlds largest database of test records 4,000,000 customer transformer test records. Oil diagnostic suites for transformer oil diagnostics. Ots100af, ots80af and ots60af laboratory oil testers. 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 bdv testing of transformer oil youtube. As the name implies, this test analyzes the type and quantity of gases that are dissolved in the transformer oil. It is done for checking the dielectric strength of the oil. 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. Electrical test hv resonant test sets impulse voltage test system induced voltage withstand test acdc hipot test set very low frequency dc hipot test sets primary current injection test relay test set transformer test sets transformer ohmmeter transformer oil tester ctpt test sets cable fault location earth resistance tester insulation tester. The automatically generated test reports are provided in pdf format and are stored on a usb stick. The most important test that can be done on the liquid insulation of a transformer is an annual dissolved gas analysis dga. The transformer oil performs two important functions. Bdv breakdown voltage value above 30kv is considered good.1355 404 1584 1493 1359 375 1306 639 905 1350 555 368 1219 247 27 355 1001 532 227 180 673 3 1409 1329 1602 1487 1012 1211 763 1379 888 1042 1488 1318 1236 176 1061 36 526 1380 351 60 32 1245 1115 518