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高壓開關(guān)柜溫度過高原因變壓器溫升過高的幾種原因

來源:www.zszhongyue.com  |  發(fā)布時(shí)間:2023年05月12日

高壓開關(guān)柜內(nèi)部實(shí)際溫升情況,尤其是母排連接等部位,通常總是比型式試驗(yàn)測出的數(shù)據(jù)高。高壓開關(guān)柜價(jià)格,湖北高壓開關(guān)柜廠家分享主要原因:


(1)型式試驗(yàn)測得數(shù)據(jù)通常是在試驗(yàn)室完成的,持續(xù)時(shí)間不長,通常不超過8h,不具備溫升累積效應(yīng),不能等同于長期運(yùn)行并持續(xù)發(fā)熱的設(shè)備。


(2)不同金屬的膨脹效應(yīng)不同。鋼制螺栓的金屬膨脹系數(shù)要比銅質(zhì)、鋁質(zhì)母線小得多,尤其是螺栓型設(shè)備接頭銅制防水接頭JG-T-M,在運(yùn)行中隨著負(fù)荷電流及溫度的變化,其鋁或銅與鐵的膨脹和收縮程度將有差異而產(chǎn)生蠕變,也就是金屬在應(yīng)力的作用下緩慢的塑性變形,蠕變的過程還與接頭處的溫度有很大的關(guān)系。實(shí)踐證明,當(dāng)接頭處的運(yùn)行工作溫度超過80℃時(shí),接頭金屬將因過熱而膨脹,使接觸表面位置錯(cuò)開,形成微小空隙而氧化。當(dāng)負(fù)荷電流減小溫度降低回到原來接觸位置時(shí),由于接觸面氧化膜的覆蓋,不可能是原安裝時(shí)金屬間的直接接觸。每次溫度變化的循環(huán)所增加的接觸電阻,將會(huì)使下一次循環(huán)的熱量增加,所增加的溫度又使接頭的工作狀況進(jìn)一步變壞,因而形成惡性循環(huán)。


(3)連接部位緊固螺栓壓力不當(dāng)。部分安裝或檢修人員在導(dǎo)體連接上認(rèn)為連接螺栓擰得愈緊愈好,其實(shí)不然。特別是鋁質(zhì)母線,彈性系數(shù)小,當(dāng)螺母的壓力達(dá)到某個(gè)臨界壓力值時(shí),若材料的強(qiáng)度差,再繼續(xù)增加不當(dāng)?shù)膲毫?,將?huì)造成接觸面部分變形隆起,反而使接觸面積減少,接觸電阻增大,從而影響導(dǎo)體接觸效果。


(4)選用的導(dǎo)體材料電導(dǎo)率不滿足要求,多數(shù)屬于導(dǎo)體原材料純度不夠。


(5)現(xiàn)場的其它因素,比如可能存在安裝檢修工藝不當(dāng),如母線在加工、連接、安裝過程中,對母線接觸表面處理不到位、不平整、不光滑、沒有涂專用電力脂等,導(dǎo)致有效接觸面積減少接觸電阻增大而發(fā)熱。

高壓開關(guān)柜溫度過高原因變壓器溫升過高的8種原因:


1、初級輸入電壓過高。


2、次級負(fù)載功率過重,也就是負(fù)載電流過大。


3、變壓器的矽鋼片的絕緣性能下降造成鐵芯的渦流增大。


4、諧波電流過大。


5、制造工藝不好[如插鐵片時(shí)插搶片了]


6、設(shè)計(jì)不合理初級匝數(shù)不足。


7、初級或次級有極少數(shù)線圈短路。


8、環(huán)境溫度過高。


高壓開關(guān)柜開關(guān)觸點(diǎn)高溫度不應(yīng)超過多少?開關(guān)柜連接處溫度。開關(guān)觸點(diǎn)按動(dòng)連接考慮。母線、電纜接頭按靜連接考慮。動(dòng)連接高溫度不應(yīng)超過70℃。靜連接高溫度不應(yīng)超過75℃。高壓開關(guān)柜溫度過高原因有很多。


一是輸出容量超過額定容量。二是安裝位置不好,有太陽光照,或者空氣不對流等造成散熱不好。三是本身有故障,有接觸不良或者打火現(xiàn)象。無論什么問題都要及時(shí)解決,不然容易引發(fā)事故或者火災(zāi)。危險(xiǎn)。

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