{"id":33948,"date":"2023-08-22T13:32:40","date_gmt":"2023-08-22T11:32:40","guid":{"rendered":"https:\/\/ecol.eu\/en\/knowledge-base\/"},"modified":"2025-08-11T14:20:00","modified_gmt":"2025-08-11T12:20:00","slug":"ecol-tests-phase-to-phase-voltage","status":"publish","type":"post","link":"https:\/\/ecol.eu\/en\/knowledge-base\/ecol-tests-phase-to-phase-voltage","title":{"rendered":"Ecol tests: Interfacial tension"},"content":{"rendered":"<header class=\"page-hero case-study-hero alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <div class=\"offset-lg-1 col-lg-7 page-hero__text\">\n\n\t        <nav aria-label=\"Okruszki\" role=\"navigation\">\n  <ul class=\"breadcrumbs\" aria-label=\"lista okruszk\u00f3w\">\n\n    \n      <li class=\"breadcrumbs__item\">\n\n                  <a href=\"https:\/\/ecol.eu\/en\/\" class=\"breadcrumbs__link\">Home page<\/a>\n        \n      <\/li>\n\n    \n  <\/ul>\n<\/nav>\n\n          <h1 class=\"heading heading--sb\">Ecol tests: Interfacial tension<\/h1>\n\n          \n            <div class=\"editor\"><li class=\"post__list-item\">\u2022 Standards: PN-EN IEC 62961:2019-06<\/li>\n<li class=\"post__list-item\">\u2022 Unit: mN\/m<\/li>\n<li class=\"post__list-item\">\u2022 Oil quantity: 50 ml<\/li>\n<li class=\"post__list-item\">\u2022 Application: electro-insulating liquids<\/li>\n<\/div>\n\n          \n      <\/div>\n      <ul class=\"col-lg-7 offset-lg-1 links\"><\/ul>\n    <\/div>\n\n\t  \n\t\t  <svg class=\"page-hero__bg page-hero__bg--diagnostics\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xml:space=\"preserve\" width=\"122.057mm\" height=\"171.64mm\" version=\"1.1\" style=\"shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd; clip-rule:evenodd\"\r\nviewBox=\"0 0 13001.94 18283.7\"\r\n xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\">\r\n <defs>\r\n  <style type=\"text\/css\">\r\n    .str1 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stress \u2013\u00a0the so-called interfacial tension \u2013\u00a0that exists between the oil sample and the water layer. A measuring ring is placed at the interface between two immiscible liquids, where it is held in place by the surface tension that exists between them. During the measurement, an attempt is made to detach the ring from the interface by gradually increasing the force. The force required to detach the ring from the interfacial surface is the measurement value.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <p><br>\n<br><strong><\/strong><\/p>\n<h2 class=\"post__header heading heading--line\">interpretation of results:<\/h2>\n<p class=\"post__paragraph\"><\/p>\n<p class=\"post__paragraph\">The interfacial tension of new transformer oil is high. As a\u00a0result of the oil ageing process, polar oxidation by-products are formed. The presence of these products lowers the interfacial tension. The interfacial tension is already significantly reduced at the initial oxidation stage, making it the first parameter providing information about the ageing of the oil.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:55px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"video alignwide \">\n\n  \n  <div class=\"container\">\n    <div class=\"row\">\n      <div class=\"offset-lg-2 col-lg-5\">\n\n        \n        \n        \n      <\/div>\n\n      \n      \n        <div class=\"offset-lg-2 col-lg-8\">\n          <div class=\"video__container\">\n            <div class=\"video__movie-wrapper\">\n\t            <iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/P8hbeS8_jhQ?si=xPmeoncV4K23KeKW\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; 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