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</html><thumbnail_url>https://nishi.com.br/novo/wp-content/uploads/2021/06/sistema-isolacao-bobinas.jpg</thumbnail_url><thumbnail_width>887</thumbnail_width><thumbnail_height>541</thumbnail_height><description>Este assunto &#xE9; muito importante para os usu&#xE1;rios de motores e geradores de grande porte. Em m&#xE1;quinas com tens&#xE3;o superior a 6 kV, operando na frequ&#xEA;ncia do sistema el&#xE9;trico (50 ou 60 Hz), as bobinas (padr&#xE3;o de mercado) possuem na parte reta um material semi condutivo (fita ou pintura) com o objetivo de evitar descargas parciais que deterioram o sistema isolante. O encaixe entre a bobina e ranhura nunca &#xE9; perfeito e sempre temos pequenos vazios neste contato. Nesta situa&#xE7;&#xE3;o, temos eletricamente um circuito com 2(dois) capacitores conectados em s&#xE9;rie de constantes diel&#xE9;tricas diferentes (ar e isolante).</description></oembed>
