{"id":86794,"date":"2026-01-13T09:22:00","date_gmt":"2026-01-13T08:22:00","guid":{"rendered":"https:\/\/www.lecosinus.fr\/?p=86794"},"modified":"2026-09-14T15:19:43","modified_gmt":"2026-09-14T13:19:43","slug":"where-did-the-idea-of-using-an-electrostatic-shield-in-transformers-come-from","status":"publish","type":"post","link":"https:\/\/www.lecosinus.fr\/en\/dou-vient-lidee-dutiliser-un-ecran-electrostatique-dans-les-transformateurs\/","title":{"rendered":"Where did the idea of using an electrostatic shield in transformers come from?"},"content":{"rendered":"

Unlike the invention of the transformer itself, which is often associated with pioneers such as Faraday or Zipernowsky, Bl\u00e1thy and D\u00e9ri, the electrostatic screen is not the work of a single inventor. Rather, it is a gradual improvement, born with the appearance of electronics in power grids.<\/p>\n\n\n\n

\"l'\u00e9cran<\/figure>\n\n\n\n

Why was an electrostatic screen introduced?<\/h2>\n\n\n\n

Originally, the objective was simple: to limit the capacitive coupling between primary and secondary schools. This coupling, inherent to transformers, allowed certain electrical interference to pass through the device and reach the equipment being powered.<\/p>\n\n\n\n

The addition of a screen, connected to the ground, made it possible to meet two essential needs:<\/p>\n\n\n\n

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  1. Reduce interference and electrical noise<\/strong><\/li>\n<\/ol>\n\n\n\n

    High-frequency, transient, common-mode noise, network interference passed from one winding to another by capacitive effect. The screen acts as a \"shield\": it captures these disturbances and drifts them towards the earth, leaving the secondary much cleaner.<\/p>\n\n\n\n

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    1. Strengthen security<\/strong><\/li>\n<\/ol>\n\n\n\n

      If there is an insulation fault between the two windings, the display can divert the leakage currents to ground. This provides an extra level of protection for the devices... and for users.<\/p>\n\n\n\n

      And today, what is it for?<\/h2>\n\n\n\n

      L\u2019\u00e9cran \u00e9lectrostatique reste largement utilis\u00e9, notamment dans les transformateurs d\u2019isolement <\/a>ou dans les applications sensibles o\u00f9 la qualit\u00e9 du signal \u00e9lectrique est indispensable.<\/p>\n\n\n\n

      Current roles:<\/h3>\n\n\n\n