Dielectric breakdown voltage kv iec 60156 pdf

This document specifies the method for determining the dielectric breakdown voltage of insulating liquids at power frequency. Dielectric breakdown voltage and dielectric strength. Astm d1816 standard test method for dielectric breakdown voltage of insulating oils of petroleum origin using vde electrodes. To ensure that the dielectric strength of the oil does not deteriorate however, proper maintenance is essential and the basis of. This is due to the larger gap separation and the higher voltage rate of rise. 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. Breakdown voltage kv iec 60156 dielectric dissipation factortan. Water content mgkg iec 60814 30 kv iec 60156 30 4060 after treatment kv iec 60296 70 70 density, 20c kgdm3 iso 12185 0. Dielectric characteristics standards of 150 kv transformer 11 characteristics good fair poor standard acidity 0.

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. Which oil testing standard should you choose to determine. Baurhvt dta 100 c oil breakdown voltage tester tequipment. The bio electra dielectric oil has an ignition point of over 300c and is classified as a type k fluid according to iec 61100. Automatic oil breakdown voltage tester vot60 vot80 vot100 is 6792, iec 60156 compliance made in india.

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. Following the iec 60156 voltage was continuously increased with the rate of 2 kv s. Dividing the latter by the oxide thickness we obtain the breakdown field provided no polysilicon depletion is necessary. Iec 60156 is an international standard that incorporates the use of either brass ball electrodes fig. Transformer oil bdv testing kit oil bdv oem manufacturer. Standard test method for dielectric breakdown voltage of. Bio electra main characteristics properties typical value viscosity at 40 c 39. For a dielectric breakdown voltage using the iec method from standard 60156, the spherical electrodes are spaced 2. Iec 60156 insulating oil dielectric strength and dielectric breakdown voltage bdv tester 80kv or 100kv i ntroduction. The megger guide to insulating oil dielectric breakdown testing. Procedure set by the iec 60156 1995 standard 1,2 is used for determining the breakdown voltage of electroinsulating oils.

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. 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. In this study, breakdown voltage variation of insulation oil which is used for high voltage equipment is. Electrical oil services ltd, po box 79, bridges road, stanlow works, ellesmere port, cheshire, ch65 4wd. The transformer oil is filled in the vessel of the testing device.

Measured dependency of the breakdown voltage on the relative moisture saturation with an approximative model fitted to the data. Breakdown voltage of the transformer oils under certain. 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. 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. Dielectric breakdown strength of magnetic nanofluid based. Mineral oil is the most common insulating fluid and has been in use since the late 19th century. Paper open access analysis of dielectric strength of virgin. Transformer oil inhibited is used as an insulating oil in transformers, switchgear, inductors, condensers.

At a certain voltage level breakdown occurs in an electric arc, leading to a collapse of the test voltage. Breakdown voltage before treatment iec 60156 4060 kv after treatment iec 6029660156 70 kv. What is the minimum value of breakdown voltage of transformer. 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. 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. Supply terminal to final equipment maximum 4% voltage drop. 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. 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.

Study on correlation among oil dielectric characteristics. The characteristics of test piece thickness and temperature are shown in fig. In order to vary the moisture level of the oil, saturated nitrogen flow. Standard test method for dielectric breakdown voltage and. The megger guide to insulating oil dielectric breakdown. To assess the insulating property of dielectric transformer oil, a sample of the transformer oil is taken and its breakdown voltage is measured. These tests are performed according to the iec 60156, astm d1816 and astm d877. Iec 60296 fluids for electrotechnical applications unused mineral insulating oils for transformers and switchgear. This material is advisory only and its use or adaptation is entirely voluntary. 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. Each point corresponds to the average of six breakdown voltage measurements performed according to the iec 60156 standard.

Automatic oil breakdown voltage tester is used for measuring the dielectric strength of insulating oil. 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 powerfrequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. The test was carried out using iec, spherical electrode with diameter of 12. Vde electrodes are most commonly used and the main difference to astm d1816 is that the electrode gap separation is fixed at 2.

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. The lower the resulting breakdown voltage, the poorer the quality of the transformer oil. The pause after breakdown for mineral oil was 2 min and for natural esters 5 min. Measure the breakdown voltage of insulation fluids used in transformers, capacitors, bushings and related high voltage equipment. The pause for natural esters is increased since they have higher viscosity, giving enough time for all breakdown products to be. The test procedure is performed in a specified apparatus, where the oil sample is subjected to an increasing ac electrical field until breakdown occurs. The effect of moisture on the breakdown voltage of. Envirotemp 200 dielectric ester fluid synthetic ester. 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. Generally speaking the iec 60156 standard using fig. In this and other breakdown techniques 5, a relatively large number of test structures i. Iec 60156 insulating liquids determination of the breakdown voltage at power frequencies test method. The dielectric breakdown voltage of pure transformer oil, ot4, is measured around 10 kv, but the cases of transformer oilbased nanofluids with 0.

Experimental study on the dielectric breakdown voltage of. Dielectric breakdown voltage determinations identify the presence of contaminants in the oil. 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. Ii electrodes will produce the highest breakdown voltages values when compared to the astm d1816 standard. Dielectric breakdown strength of magnetic nanofluid based on.

The breakdown voltage mesurement was carried out iec 60156 by an automatic oil breakdown test set megger ots100af. The baur dta 100 c oil breakdown voltage tester fully automatically tests the electrical breakdown strength of insulating liquids. Test sequences can be accomplished easily and fully automatically in compliance with all international and national standards. In physical, the term dielectric strength has the following meanings. There is also a japanese standard not based on these astm or iec standards. 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. Lcd screen can display test procedure and test result.