描述
?電動機是工廠用得最多的設(shè)備,電動機的容量應(yīng)合理選擇。要避免用大功率電動機去拖動小功率設(shè)備(俗稱大馬拉小車)的不合理用電情況,要使電動機工作在高效率的范圍內(nèi)。當(dāng)電動機的負載經(jīng)常低于額定負載的40%時,要合理更換,以避免電動機經(jīng)常處于輕載狀態(tài)運行,或把正常運行時規(guī)定作△接法的電動機改為Y接法,以提高電動機的效率和功率因素。對工作過程中經(jīng)常出現(xiàn)空載狀態(tài)的電氣設(shè)備(例如拖動機床的電動機、電焊機等),可安裝空載自動斷電裝置,以避免空載損耗。?工礦企業(yè)在合理使用變壓器、電動機等設(shè)備的基礎(chǔ)上,還可裝設(shè)無功補償設(shè)備,以提高功率因數(shù)。企業(yè)內(nèi)部的無功補償設(shè)備應(yīng)裝在負載側(cè),例如在負載側(cè)裝設(shè)電容器、同步補償器等,可減小電網(wǎng)中的無功電流,從而降低線路損耗。所謂兩部制電價,就是把電價分成兩個部分,其一是基本電價,其二是電度電費?;倦妰r是根據(jù)用戶的變壓器容量或最大需用量來計算,是固定的費用,與用戶每月實際取用的電度數(shù)無關(guān)。電度電費則是按用戶每月實際取用的電度數(shù)來計算,是變動的費用。這兩部分電費的總和即為用戶全月應(yīng)付的全部電費,實行兩部制電價可以促進用戶提高負荷率和設(shè)備利用率。如果用戶的負荷率較低,而變壓器的容量又過大,則用戶支付的基本電費就較高,反之就較低。在用戶按不同類別計算出當(dāng)月全部電費時,按照電力部門的規(guī)定,若功率因數(shù)高,則可減免部分電費,反之則增收部分電費。采用遠紅外加熱技術(shù),可使被加熱物體所吸收的能量大大增加,使物體升溫快,加熱效率高,節(jié)電效果好,耐火纖維材料配合使用,節(jié)電效果更佳。在工礦企業(yè)中有許多設(shè)備需要使用直流電源,如同步電機的勵磁電源,化工、冶金行業(yè)中的電解、電鍍電源,市政交通電車的直流電源等。以前這些直流電源大多是采用汞弧整流器或交流電動機拖動直流發(fā)電機發(fā)電,它們的整流效率低,若改用硅整流器或晶閘管整流裝置,則效率可大為提高,節(jié)電效果甚為顯著。此外,采用節(jié)能型照明燈,在大電流的交流接觸上安裝節(jié)電消聲器(即直流無聲運行),加強用電管理和做好節(jié)約用電的宣傳工作等,也都是節(jié)約用電的重要措施。
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