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常見(jiàn)問(wèn)題

屯昌變壓器維修的作用是什么

變壓器的維修并非是在變壓器出現(xiàn)故障了再進(jìn)行維修處理，變壓器的維修是指對(duì)機(jī)器的定期維修，其維修的目的是為了機(jī)器更好的運(yùn)轉(zhuǎn)。變壓器維修的作用是什么，關(guān)于這一問(wèn)題小編將進(jìn)行詳細(xì)的敘述。

變壓器維修的作用如下：

1．防止變壓器鐵芯絕緣老化損壞。鐵芯絕緣老化或夾緊螺栓套管損壞，會(huì)使鐵芯產(chǎn)生很大的渦流，引起鐵芯長(zhǎng)期發(fā)熱造成絕緣老化。

2．保證導(dǎo)線(xiàn)接觸良好。線(xiàn)圈內(nèi)部接頭接觸不良，線(xiàn)圈之間的連接點(diǎn)、引至高、低壓側(cè)套管的接點(diǎn)、以及分接開(kāi)關(guān)上各支點(diǎn)接觸不良，會(huì)產(chǎn)生局部過(guò)熱，破壞絕緣，發(fā)生短路或斷路。此時(shí)所產(chǎn)生的高溫電弧會(huì)使絕緣油分解，產(chǎn)生大量氣體，變壓器內(nèi)壓力加。當(dāng)壓力超過(guò)瓦斯斷電器保護(hù)定值而不跳閘時(shí)，會(huì)發(fā)生爆炸。

3．防止變壓器過(guò)載運(yùn)行。如果長(zhǎng)期過(guò)載運(yùn)行，會(huì)引起線(xiàn)圈發(fā)熱，使絕緣逐漸老化，造成匣間短路、相間短路或?qū)Φ囟搪芳坝偷姆纸狻?/div>

4．短路保護(hù)要可靠。變壓器線(xiàn)圈或負(fù)載發(fā)生短路，變壓器將承受相當(dāng)大的短路電流，如果保護(hù)系統(tǒng)失靈或保護(hù)定值過(guò)大，就有可能燒毀變壓器。為此，必須安裝可靠的短路保護(hù)裝置。

5．防止檢修不慎破壞絕緣。變壓器檢修吊芯時(shí)，應(yīng)注意保護(hù)線(xiàn)圈或絕緣套管，如果發(fā)現(xiàn)有擦破損傷，應(yīng)及時(shí)處理。

6．保證絕緣油質(zhì)量。變壓器絕緣油在貯存、運(yùn)輸或運(yùn)行維護(hù)中，若油質(zhì)量差或雜質(zhì)、水分過(guò)多，會(huì)降低絕緣強(qiáng)度。當(dāng)絕緣強(qiáng)度降低到一定值時(shí)，變壓器就會(huì)短路而引起電火花、電弧或出現(xiàn)危險(xiǎn)溫度。因此，運(yùn)行中變壓器應(yīng)定期化驗(yàn)油質(zhì)，不合格的油應(yīng)及時(shí)更換。把安全工程師站點(diǎn)加入收藏夾

7．防止電擊。電力變壓器的電源一般通過(guò)架空線(xiàn)而來(lái)，而架空線(xiàn)很容易遭受雷擊，變壓器會(huì)因擊穿絕緣而燒毀。

8．防止超溫。變壓器運(yùn)行時(shí)應(yīng)監(jiān)視溫度的變化。如果變壓器線(xiàn)圈導(dǎo)線(xiàn)是A級(jí)絕緣，其絕緣體以紙和棉紗為主，溫度的高低對(duì)絕緣和使用壽命的影響很大，溫度每升高8℃，絕緣壽命要減少50%左右。變壓器在正常溫度(90 ℃)下運(yùn)行，（考試－大）壽命約20年；若溫度升至105℃，則壽命為7年5溫度升至120℃，壽命僅為兩年。所以變壓器運(yùn)行時(shí)，一定要保持良好的通風(fēng)和冷卻，必要時(shí)可采取強(qiáng)制通風(fēng)，以達(dá)到降低變壓器溫升的目的。

9．保持良好的接地。對(duì)于采用保護(hù)接零的低壓系統(tǒng)，（考試．大）變壓器低壓側(cè)中性點(diǎn)要直接接地當(dāng)三相負(fù)載不平衡時(shí)，零線(xiàn)上會(huì)出現(xiàn)電流。當(dāng)這一電流過(guò)大而接觸電阻又較大時(shí)，接地點(diǎn)就會(huì)出現(xiàn)高溫，引燃周?chē)目扇嘉镔|(zhì)。

以上內(nèi)容是對(duì)變壓器維修的相關(guān)內(nèi)容。為了機(jī)器的正常而持久的使用，對(duì)變壓器進(jìn)行定期的維修是很有必要的一件事情。

點(diǎn)擊次數(shù)：51652 更新時(shí)間：2017-07-19

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