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變壓器油超標(biāo)的原因

來(lái)源:揚(yáng)州金力電氣   添加時(shí)間:2025-07-07 08:41:32   瀏覽次數(shù):141  

變壓器油超標(biāo)的原因

變壓器油在交變電場(chǎng)的作用下會(huì)引起化損失和電導(dǎo)損失。這些統(tǒng)稱為介電損耗。介質(zhì)損耗因數(shù)反映變壓器絕緣特性的好壞以及變壓器油在電場(chǎng)、氧化和高溫作用下的老化情況。

變壓器油介損過(guò)大會(huì)影響變壓器的正常運(yùn)行。目前解決變壓器油介損過(guò)大問(wèn)題主要有兩種方法。一是更換不合格的油,重新注入通過(guò)電性試驗(yàn)和化學(xué)分析的油。就是再生多余的油。

1、更換不合格的油,重新注入電氣試驗(yàn)和化學(xué)分析合格的油。更換不合格的油可以縮短系統(tǒng)的停電時(shí)間。只需將變壓器內(nèi)的舊油排盡,用合格油沖洗變壓器,然后對(duì)變壓器進(jìn)行真空注油。這種處理比較適合不允許長(zhǎng)期停電的機(jī)組;機(jī)組運(yùn)行時(shí)間長(zhǎng),油酸值高,油呈深黃色或褐色,游離水或油渾濁,降解充分。但單純換油不如濾油“沖洗”變壓器徹底,換油消耗大,不利于節(jié)能環(huán)保。超標(biāo)不宜換油。

2、再生多余的油。再生是指用物理化學(xué)或化學(xué)方法去除油中的有害物質(zhì),恢復(fù)或改善油的理化指標(biāo)。常用的再生方法有:吸附法和硫酸-白土法。

吸附法適用于處理劣化程度較輕的油品;硫酸粘土法適用于處理劣化程度較重的油品。吸附法又可分為接觸法和滲濾法。接觸法采用粉狀吸附劑和油以攪拌接觸方式再生;而滲濾法是迫使油通過(guò)裝有顆粒吸附劑的凈化器。

滲濾再生處理。對(duì)于變質(zhì)嚴(yán)重的變壓器油,可采用硫酸-白土法進(jìn)行再生。硫酸處理可以去除油中的多種老化產(chǎn)物,粘土處理可以消除酸處理后殘留在油中的不良物質(zhì)。在實(shí)際生產(chǎn)經(jīng)營(yíng)中,經(jīng)常會(huì)遇到油經(jīng)抽真空、過(guò)濾、凈化后,油的含水量很小,油的中損系數(shù)高的情況。這是因?yàn)橛偷闹袚p系數(shù)不僅與油的含量有關(guān),水的多少也與許多因素有關(guān)。大多數(shù)變壓器油的介電損耗因數(shù)增加的原因是油中可溶性性物質(zhì)的增加。對(duì)于直徑在10-10-Tm之間的溶膠顆粒,它們可以通過(guò)濾紙。所以,二次真空濾油機(jī)無(wú)法處理溶膠顆粒的介質(zhì)損失系數(shù)。因此,無(wú)法處理由此原因造成的油介質(zhì)損失,因子增加通常通過(guò)滲濾再生。

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