For personal use only. This paper reveals that pressboard ageing in both types of oils associates with dissolved 2-FAL and CO 2 +CO concentration in oil. in an insulating liquid. Due to the voluminous properties that are compared and discussed, this paper is presented in two parts: Part 1 discusses on key properties and standards for the two liquids. ABSTRACT . This paper also investigates the gassing behavior of natural ester under transformer operating environment. Due to the concerns about the reducing petroleum resources and the environmental issues, the alternative insulating oil with biodegradable characteristics has been attracted lots of attentions for a couple of decades. investigated biodegradable olive oil, rapeseed oil, crone and sunflower oil using ultraviolet/visible, infrared, spectroscopes and found that olive oil offered excellent resis-, tance to aging, rapeseed oil offered intermediate properties, whereas corn and sunflower oil oxidized appreciably after, and dielectric losses of coconut oil and mineral oil impregnated, pressboard samples during oven heating using frequency do-, main dielectric spectroscopy (FDS) and draws the conclusion, that losses were relatively higher for coconut oil imp. The tests are conducted based on Indian Standards (IS6792). 0000006014 00000 n Therefore the electric field distribution in the case of applied voltage becomes more homogeneous and thus the breakdown strength of the PP foils increases . like synthetic esters, vegetable oil, silicon fluid, etc. 0000006808 00000 n insulation fluids, and in many distribution transformers they are already used satisfactorily. Electrical Insulating Materi-, IEEE Conf. cipient faults diagnosis using dissolved gas analysis and rough set, 2012 Int. Liquid Insulation . Vegetable oils which are abundant in nature unlike the mineral oil is being studied as a suitable substitute for mineral oils as transformer oil. The effect of electrical stress and ageing time on the oil samples were performed in this work. Hosier. Due to environmental concerns and increased energy demand, natural esters are among the alternatives to mineral oils in transformers. repeated impulses on transformer insulation. Power and Energy (PECon), Partial discharge characteristics of palm fatty acid ester (PFAE) as. An attempt has been made to classify different insulating liquids-based on dif, Transformers are key components of electrical pow. Even though they have better insulating and cooling properties, there are some issues related with environmental aspect. Thermal Insulating Performance of Various Materials 0.01 0.1 1 10 100 1000 10000 100000 1000000 Pure Copper Stainless Steel Concrete Whale Blubber Ice Oak Board Cork Fiberglass Polyurethane Foam Aerogel Compos ite Blanket MLI System at SV LCI System at SV Aerogel Beads at HV LCI System at HV MLI System at HV Thermal Conductivity (milliWatt per meter-Kelvin) Representative k-values Material … assessment of their suitability for high voltage applications. conut oil as an alternative transformer liquid insulation, dation status of insulating elements in oil-immersed. Yang Xu, investigated oxidation stability of vegetable trans-, former oil under accelerated thermal aging by using pressu, differential scanning calorimetry (PDSC) method and draws, the conclusion that acidity is not suitable but viscosity is, responsive for vegetable oils. To recognize various brunts of NFs and show evolving developments and challenges, the study demonstrates a scientometric review established on 210 published features from 2004 to 2019 through co-author, co-occurring and co-citation investigations. as dielectric medium and coolant are a high impulse strength, high electric strength, and high volume resistivity, high, thermal conductivity, high specific heat, high flash point, low, Apart from these, good transformer oil should have high re-, sistance to chemical deterioration, nonflammable, cheap and, In recent years, many researchers have been carried out to, synthetic, as well as natural fluids have been tested and used, structure of synthetic ester and the natural ester is shown in, of polynuclear aromatic hydrocarbons which may readily be, released into the environment due to the explosion of a, transformer, poor biodegradability and future scarcity. ... Natural esters obtained from plants such as rapeseed, soybean, sunflower, olive, palm and jatropha, consist mainly of triglycerides, which contain unsaturated fatty acids [1,4,11]. The common mineral oil had these properties much better than the sunflower and rapeseed oils. switches, circuit breakers, tap changers and, The purpose of this study is to provide in-, vironment-friendly insulating oils which show, regards application in the transformer. 0000007638 00000 n The results showed that in both coconut oil and mineral oil impregnated pressboard samples, capacitance and dielectric losses increased with heating time, temperature level and initial moisture content. Thermal insulation materials fall into the latter category. Song and Z. Peng, Research of the fga-ann method for trans-. Liquid insulating materials are usually used in medium as well as high voltage transformers. The advancements in electricity production and distribution, as well as the growing consumption of electrical energy, have made electrical equipment a vital part of the technological infrastructure. With the termination of the, PCBs, the power industries turned to other liquid insulation. Changing such a crucial component as the insulating liquid itself, the suitability must be proven most thoroughly. - Comparison of Insulation Materials 92-95 - CE Marking for technical insulation 96 - Energy Saving Opportunities Scheme 97 Armaflex HVAC-R & Process Specification Guide. The results were compared to the American College of Radiology (ACR) large MRI phantom electrolyte liquid (10 mM NiCl2 and 75 mM NaCl in water) and deionized water. Besides an electroinsulating function, the transformer oil plays a key role in a cooling task, therefore it has to be able to resist to the high temperatures and retain the desired parameters in this condition, too. Researchers are trying to bring the vis-, cosity of coconut oil to recommended level by doing some, chemical modification. Electrical insulation materials Liquids and liquid impregnated electrical insulation Dielectric liquids are utilized as electrically insulating materials because they have good electrical properties, they will act as a coolant, and also have arc quenching capabilities. Part 2 emphasizes on additional key properties and material compatibility related to electrical design. For these purposes, a few vegetable oils available in Bangladesh are investigated for their electrical and physical properties. Universities Power Engineering Conference (UPEC), ester-based transformer oils determined by using different test, S. Okabe, S. Kaneko, M. Kohtoh and T. Amimoto, Analysis. Electrical insulation materials cannot be applied only on the basis of their dielectric strength. The, Except for the working parts there is an insulation, which is the inseparable component of the system in every high-voltage device. 0000011031 00000 n Electrical Insulating Materials, 2008, 2015 IEEE Int. It has been found in the literature that, vegetable oils and synthetic esters have drawn the most at-, properties of low flammability, negligible environmental, impact, and high moisture tolerance, nontoxic to. analysis of alternative fluids for power transformers, analysis (DGA) of arcing faults in biodegradable oil insulation. using high- temperature insulation materials . 0000015335 00000 n 0000008286 00000 n 28. . 0000011566 00000 n Researchers are looking for the alternatives, which are derived from renewable and environmentally, friendly sources. Characterization of different liquids as an insulating material has been discussed. Thus it necessary to control the amount of gases present. 1979 EIC 14th Electrical/Electronics Insulation Conf. 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