The test was carried out using iec, spherical electrode with diameter of 12. The breakdown voltage mesurement was carried out iec 60156 by an automatic oil breakdown test set megger ots100af. Supply terminal to final equipment maximum 4% voltage drop. Which oil testing standard should you choose to determine. Iec 60156 insulating oil dielectric strength and dielectric breakdown voltage bdv tester 80kv or 100kv i ntroduction. The baur dta 100 c oil breakdown voltage tester fully automatically tests the electrical breakdown strength of insulating liquids. Dielectric breakdown strength of magnetic nanofluid based on. Dielectric breakdown voltage and dielectric strength date 1086 revision originating task group na material in this test methods manual was voluntarily established by technical committees of the ipc. Study on correlation among oil dielectric characteristics. The bio electra dielectric oil has an ignition point of over 300c and is classified as a type k fluid according to iec 61100. Electrical oil services ltd, po box 79, bridges road, stanlow works, ellesmere port, cheshire, ch65 4wd.
Standard test method for dielectric breakdown voltage and. Experimental study on the dielectric breakdown voltage of. Mineral oil is the most common insulating fluid and has been in use since the late 19th century. The megger guide to insulating oil dielectric breakdown testing. China iec 60156 insulating oil dielectric strength and. Ac dielectric breakdown voltage measurement was carried out according to iec 60156 standard and the lightning impulse breakdown voltage was obtained by using the spheresphere electrodes in an experimental setup for nano oil in volume concentration of 0. Breakdown voltage kv iec 60156 30 40 health and safety information sheets are available for all electrical oil services ltd products from the address below. In physical, the term dielectric strength has the following meanings. Breakdown voltage kv iec 60156 dielectric dissipation factortan. According to the iec 60156 1995 standard, the procedure for testing dielectric hardness requires the use of a test voltage obtained by using a stepup transformer supplied from an a. Automatic oil breakdown voltage tester vot60 vot80 vot100 is 6792, iec 60156 compliance made in india. As its title indicates, this standard applies only to new, unused oil as received from the manufacturer, which must have a dielectric breakdown voltage of 30 kv or more, determined using the iec 60156 test method. The lower the resulting breakdown voltage, the poorer the quality of the transformer oil. To assess the insulating property of dielectric transformer oil, a sample of the transformer oil is taken and its breakdown voltage is measured.
The transformer oil is filled in the vessel of the testing device. The dielectric breakdown voltage of pure transformer oil, ot4, is measured around 10 kv, but the cases of transformer oilbased nanofluids with 0. The pause after breakdown for mineral oil was 2 min and for natural esters 5 min. Breakdown voltage of the transformer oils under certain. Dielectric characteristics standards of 150 kv transformer 11 characteristics good fair poor standard acidity 0. The powerfrequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. There is also a japanese standard not based on these astm or iec standards. Transformer oil bdv testing kit oil bdv oem manufacturer. Measured dependency of the breakdown voltage on the relative moisture saturation with an approximative model fitted to the data. It is fully automatic test kit developed to test oil sample as per is6792iec 60156 with printer facility user can print test report for record keeping purpose.
Standard test method for dielectric breakdown voltage of. These tests are performed according to the iec 60156, astm d1816 and astm d877. Each point corresponds to the average of six breakdown voltage measurements performed according to the iec 60156 standard. Breakdown voltage before treatment iec 60156 4060 kv after treatment iec 6029660156 70 kv. Dielectric breakdown strength of magnetic nanofluid based. Acidity mg kohg iec 620211,i ec 620212 oxidation stability, 164 hi ec 61125, method c total acidity mg kohg total sludge % mass electrical breakdown voltage kv iec 60156 dielectric dissipation factortan. Paper open access analysis of dielectric strength of. Test sequences can be accomplished easily and fully automatically in compliance with all international and national standards.
A test voltage is applied to the electrodes and is continuously increased up to the breakdown voltage with a constant, standardcompliant slew rate of e. Dielectric breakdown voltage oil as received mitigates the enhancement of electric field and then the after treatment kv kv iec 60156 pointplate configuration was due to high nonuniformity of the min. Procedure set by the iec 60156 1995 standard 1,2 is used for determining the breakdown voltage of electroinsulating oils. Before treatment iec 60156 4060 kv after treatment iec 6029660156 70 kv the information given in the typical data does not constitute a specification but is an indication based on current production and can be affected by.
In this study, breakdown voltage variation of insulation oil which is used for high voltage equipment is. Paper open access analysis of dielectric strength of virgin. Water content mgkg iec 60814 30 kv iec 60156 30 4060 after treatment kv iec 60296 70 70 density, 20c kgdm3 iso 12185 0. Oem manufacturer of oil breakdown voltage test set oil breakdown voltage test set, 80 kv oil breakdown tester, motorized oil insulation test set offered by veer electronics private limited, gandhinagar, gujarat. The megger guide to insulating oil dielectric breakdown.
In order to vary the moisture level of the oil, saturated nitrogen flow. With the appropriate oil vessel test cell, these test sets are designed to perform tests in accordance with standards astm d1816, astm d877, iec 60156, bs 148, vde 0370, plus other applicable standards. Measure the breakdown voltage of insulation fluids used in transformers, capacitors, bushings and related high voltage equipment. Generally speaking the iec 60156 standard using fig. This is due to the larger gap separation and the higher voltage rate of rise. What is the minimum value of breakdown voltage of transformer. This material is advisory only and its use or adaptation is entirely voluntary. Ii electrodes will produce the highest breakdown voltages values when compared to the astm d1816 standard. Iec 60156 insulating oil dielectric strength and dielectric breakdown voltage bdv tester 80kv or 100kv is developed according to the national standard gb86 insulating oil dielectric strength testing method. Baurhvt dta 100 c oil breakdown voltage tester tequipment. Because the dielectric strength breakdown voltage of gases strongly depends on the electrode geometry and surface condition a nd the gas pressure, it is generally accepted to present the data for a particular gas as a fraction of the dielectric strength of either nitrogen o r sulfur hexafluoride measured at the same conditions. The effect of moisture on the breakdown voltage of.
Iec 60156 is an international standard that incorporates the use of either brass ball electrodes fig. At a certain voltage level breakdown occurs in an electric arc, leading to a collapse of the test voltage. For a dielectric breakdown voltage using the iec method from standard 60156, the spherical electrodes are spaced 2. Following the iec 60156 voltage was continuously increased with the rate of 2 kv s. Envirotemp 200 dielectric ester fluid synthetic ester. Dividing the latter by the oxide thickness we obtain the breakdown field provided no polysilicon depletion is necessary. The pause for natural esters is increased since they have higher viscosity, giving enough time for all breakdown products to be. I ec 60247,i ec 61620 90 c and 50 hz dc resistivity at 90 c gm iec 60247 a for untreated liquid, as received iec 61099. In our country minimum breakdown voltage for oil transformers when it is tested according iec is 30 kv mm. Insulating liquids determination of the breakdown voltage. In this and other breakdown techniques 5, a relatively large number of test structures i. Bio electra main characteristics properties typical value viscosity at 40 c 39. Dielectric breakdown voltage and dielectric strength. Dielectric breakdown voltage determinations identify the presence of contaminants in the oil.
To ensure that the dielectric strength of the oil does not deteriorate however, proper maintenance is essential and the basis of. It is fully automatic test kit developed to test oil sample as per is6792 iec 60156 with printer facility user can print test report for record keeping purpose. The test procedure is performed in a specified apparatus, where the oil sample is subjected to an increasing ac electrical field until breakdown occurs. Lcd screen can display test procedure and test result. Vde electrodes are most commonly used and the main difference to astm d1816 is that the electrode gap separation is fixed at 2. The characteristics of test piece thickness and temperature are shown in fig. Iec 60296 fluids for electrotechnical applications unused mineral insulating oils for transformers and switchgear. Transformer oil inhibited is used as an insulating oil in transformers, switchgear, inductors, condensers. Automatic oil breakdown voltage tester is used for measuring the dielectric strength of insulating oil.