{"id":875,"date":"2014-05-06T19:58:14","date_gmt":"2014-05-06T17:58:14","guid":{"rendered":"http:\/\/globecoreoil.com\/?p=875"},"modified":"2014-05-06T19:58:14","modified_gmt":"2014-05-06T17:58:14","slug":"classification-of-tests-on-new-transformer-oil","status":"publish","type":"post","link":"https:\/\/aceite.globecore.com\/classification-of-tests-on-new-transformer-oil","title":{"rendered":"Classification of New Transformer Insulating Oil Testing"},"content":{"rendered":"

The conditions in which insulating oil is used in transformers, switches, and other high voltage equipment are rather demanding on the performance characteristics of the insulating oil.\u00a0 During the service life of the oil, it is heated by currents, contaminated by particles of solid insulation and chemical reactions with the internal surfaces of the equipment.\u00a0 Each of these separately and together significantly accelerate the aging of transformer oil and can make the oil harmful to the equipment.\u00a0 This is especially true with regards to the transformer insulating paper.
\n<\/span><\/p>\n

A sample of transformer oil is taken from the lower part of the transformer oil tank after rinsing the drain opening with oil.\u00a0 The sampling vessel must be clean and very dry or the testing results will not reflect the true condition of the oil being tested.<\/p>\n

Local and international standards define certain parameters by which the oil must comply.\u00a0 Oil analysis and testing should be performed directly before placing oil into the electric power equipment.<\/p>\n

New transformer oil is also tested before being placed into transformers.\u00a0 The purity and quality guaranteed by the manufacturer of the oil does not prevent water, air and solid particles from entering the oil during handing and storage.\u00a0 You cannot assume that the new oil is free from contaminates and moisture.\u00a0 The oil must be properly analyzed immediately prior to use to ensure the proper operation of your electrical equipment<\/p>\n

Before a transformer is energized, the oil in the transformer must be briefly tested for minimum dielectric strength levels, solid particulate matter, acidity and flashpoint.\u00a0 If different brands of oil are used in the transformer, the final blend must be tested for stability.\u00a0 The blended oil fill should not be inferior in stability to any of the separate oils with the lowest stability value.<\/p>\n

Used oil must be tested according to standards that have been set for the operation of industrial equipment that it will be used in.<\/p>\n

Before testing, the vessel, containing the oil sample, is inverted and turned slowly around several times to eliminate air bubbles from the oil sample.\u00a0 A ceramic oil test vessel with electrodes is filled three times.\u00a0 Oil is poured on the walls of the vessel in a thin stream so as to prevent formation of air bubbles.\u00a0 The level of oil in the vessel must be at least 15 mm higher than the top of the electrodes.<\/p>\n

Transformer oil is allowed to settle in the vessel for 15-20 minutes for air bubble removal.\u00a0 The voltage is then gradually increased at the rate of 1 \u2013 2 kV per second.\u00a0 After a breakthrough is achieved (spark between the electrodes), voltage is recorded and then dropped to zero.\u00a0 Six tests are performed and the average of the last five tests is taken.\u00a0 The first breakthrough is not averaged in since it was only performed as a guide.<\/p>\n

After each breakthrough, carbon particles are removed from the space between the electrodes by clean glass or metal rods.\u00a0 The liquid is then allowed to settle for 10 minutes before performing the next test.<\/p>\n

The transformer oil sampling process will vary from facility to facility depending on the equipment used and purity requirements of the equipment and oil being tested.<\/p>\n

At any rate, a timely oil analysis program may well prevent significant costs and losses for your company.<\/p>\n","protected":false},"excerpt":{"rendered":"

The conditions in which insulating oil is used in transformers, switches, and other high voltage equipment are rather demanding on the performance characteristics of the insulating oil.\u00a0 During the service life of the oil, it is heated by currents, contaminated by particles of solid insulation and chemical reactions with the internal surfaces of the equipment.\u00a0Read More <\/a><\/p>\n","protected":false},"author":24,"featured_media":889,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[53,15,25,11,16,54,8],"class_list":["post-875","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tierra-fuller","tag-new-transformer-oil","tag-oil-analyse","tag-oil-degassing","tag-oil-purification","tag-oil-testing","tag-oil-tests","tag-transformer-oil"],"acf":[],"language":"en","_links":{"self":[{"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/posts\/875","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/comments?post=875"}],"version-history":[{"count":0,"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/posts\/875\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/media?parent=875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/categories?post=875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aceite.globecore.com\/en\/wp-json\/wp\/v2\/tags?post=875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}