Breakdown voltage of transformer oil pdf

The area under your pulse should be less than this value. In this article, i will discuss transformer oil sample tests other than dissolved gas analysis dga. Usually the contaminant is water, but it can also be conductive particles, dirt, debris, insulating particles and the byproducts of oxidation and aging of the oil. The megger guide to insulating oil dielectric breakdown. The effect of moisture on the breakdown voltage of. The oil serves as electrical insulation and coolant in transformers. The breakdown voltage of an oil sample increases significantly with temperature. 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. The dielectric breakdown voltage test is a relatively quick and easy way of determining the amount of contamination in insulating oil. The integrity of the oil insulation is important factor in keeping the normal operation of the transformer. The dielectric strength of transformer oil is also known as the breakdown voltage of the transformer oil. Power transformers utilize oil as a heat transfer medium and a dielectric material, together with cellulose.

Breakdown voltage is measured by observing at what voltage, sparking strands between two electrodes immersed in the oil, separated by a specific gap. The breakdown voltage of mineral insulation oil was systematically investigated under the influences of moisture, acidity, pressure and particles. Also known as the sparking strength, the higher the voltage required to jump the spark, the higher the bdv will be in the oil. The standards iec15695 vde0370part596 and astm d1816 specified the test conditions. Breakdown voltage bdv is measured by observing the voltage that is required to jump a spark between two electrodes immersed in the oil separated by a specific gap or distance. As a result the breakdown voltage is calculated as mean value of the individual measurements. Pdf effect of acids formation on the breakdown voltage. Low value of bdv indicates presence of moisture content and conducting substances in the oil. A low value of bdv indicates presence of moisture content and conducting substances in the oil. Breakdown voltage dielectric strength is one of the most important parameters of transformer oil. The approximatecompositions of niirabers1 to 6 inclusive fur.

Breakdown voltage bdv testing of transformer oil youtube. C could easily have a breakdown voltage of nearly 60 kv at 70. Effect of acids formation on the breakdown voltage properties of transformer insulating oil article pdf available in iop conference series materials science and engineering 767. Oil insulation is important component in the transformers. From my experience, untreated, raw transformer oil has to withstand 40 kv per 2.