Электропроводящие смазки — надежная мера снижения аварийности в сетях и уменьшения потерь в электрических контактах

Электропроводящие смазки-надежная мера снижения аварийности в сетях и уменьшения потерь в электрических контактах

Причиной предаварийного состояния устаревшего оборудования чаще всего является окисление контактных соединений, которое приводит к увеличению их переходного со­противления. перегреву при протекании боль­ших токов и снижению надежности. При длительной работе электрических аппаратов выше 1 кВт рекомендуемая ГОСТ 8024 температура контактов из меди и медных сплавов должна быть не выше 75 °С, а кон­тактных соединений из меди, алюминия и их сплавов не выше 90 °С (температура ука­зана при нахождении контактов на воздухе). Но, по данным обследования, она часто пре­вышает 200 °С. Более всего перегреву подвер­жены неподвижные н подвижные контакты рубильников, контактные группы выключате­лей нагрузки, болтовые соединении шинных мостов,. присоединений коммутационных аппа­ратов, наконечников отходящих кабелей. Сварные, прессуемые, обжимные и паяные со­единения в общем случае надежнее, чем бол­товые, и особенно — одноболтовые контакты, а также переходные с меди на алюминий, ра­ботающие на открытом воздухе, клиновые контакты, контакты, выполняемые методом во­лочения (типа Мафраль), стержневые (особен­но переходные со стержня на плоскую шину при токах более 200 А), контакты из латуни, а также подвижные и скользящие.

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