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故在電路中起著自動調(diào)節(jié)、保護(hù)、轉(zhuǎn)換電路等作用。主要用于發(fā)電機(jī)、變壓器和輸電線的繼電保護(hù)裝置中，作為過電壓保護(hù)或低電壓閉鎖的啟動原件。[1]中文名電壓繼電器外文名Voltagerelay類別電氣設(shè)備學(xué)科電工學(xué)作用自動調(diào)節(jié)、保護(hù)、轉(zhuǎn)換電路分類過電壓繼電器、欠電壓繼電器目錄1介紹2分類3電磁式電壓繼電器4靜態(tài)電壓繼電器介紹編輯電壓繼電器是輸入量、特性量為電壓的量度繼電器，分為過電壓繼電器和欠電壓繼電器。前者由于電壓值達(dá)到整定值而，然后處于動后狀態(tài)；后者由于電壓值達(dá)到整定值而，然后處于釋放狀態(tài)。電壓繼電器有電磁型、晶體管型。電磁型電壓繼電器原理及結(jié)構(gòu)如圖1所示，當(dāng)電壓達(dá)到整定值時，鐵芯將舌片吸合。基礎(chǔ)頂部應(yīng)預(yù)埋M24地腳螺栓，螺栓基礎(chǔ)高度應(yīng)不小于100mm，螺栓的預(yù)埋位置偏差不得大于±2mm；引入電纜預(yù)埋鋼管的位置及規(guī)格等）。23)立桿及其主要構(gòu)件的室外控制開關(guān)箱應(yīng)采用不銹鋼箱體，并對其表面作噴塑處理。24)立桿采用Φ159×6直縫鋼管；立桿與橫支臂的連接端頭(0.2m)采用Φ89×4.5直縫鋼管，焊接加強(qiáng)板(δ10鋼板)保護(hù)；立桿與基礎(chǔ)采用法蘭盤加預(yù)埋螺栓連接，焊接加強(qiáng)板(δ10鋼板)保護(hù)；橫支臂與立桿端頭連接采用法蘭盤連接，并進(jìn)行焊接加強(qiáng)板(δ10鋼板)保護(hù)；立桿的中心軸線距橫支臂靠路中心一側(cè)端頭的間距為5m。橫支臂采用Φ89×4.5直縫鋼管；且橫支臂中間均勻焊接立管3根，采用Φ60×4.5鋼管。
應(yīng)及時進(jìn)行檢查。排污編輯壓差排污:當(dāng)雜質(zhì)聚積到一定數(shù)量時，利用冷卻水進(jìn)管之間差壓來反沖洗排污，即電接點壓力表接通控制，控制機(jī)構(gòu)打開電動排污閥，電動減速機(jī)將以每分鐘3-6轉(zhuǎn)的轉(zhuǎn)速運(yùn)轉(zhuǎn),經(jīng)由排污管路和排污閥門冷卻水管中，清排一次約5-10分鐘左右。當(dāng)出現(xiàn)大的雜物，濾網(wǎng)不能運(yùn)行到位時，電動裝置應(yīng)作反方向運(yùn)行，沖洗雜物。用戶如需要可設(shè)置排污時間性，在0-99小時內(nèi)設(shè)定清洗排污時間,一般設(shè)置為12個小時排污一次,時間設(shè)定可以按照電廠水質(zhì)的情況而做相應(yīng)。即設(shè)定時間啟動電動減速機(jī)進(jìn)行反轉(zhuǎn)使排污閥打開，依次進(jìn)行反轉(zhuǎn)反沖洗排污。直至全部腔室反沖完畢，電動裝置停止工作，電動反沖閥和電動排污閥關(guān)閉。
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時間不大于0.15s。6.熱性能：當(dāng)周圍溫度為40℃時，繼電器能在長期允許電壓（見表1）下工作，無絕緣和其它元件損壞，其線圈溫升不超過65℃。7.過載能力：當(dāng)繼電器的線圈并聯(lián)時，在整定值處，使電壓均勻地自1.05倍整定電壓升至2.2倍整定電壓時，繼電器動合觸點不應(yīng)有不能工作的抖動。8.絕緣性能a.絕緣電阻不小于300MΩ。b.介質(zhì)強(qiáng)度繼電器各導(dǎo)電電路連在一起與外露的非帶電金屬部分及外殼之間，能承受2kV（有效值）、50Hz的交流電壓歷時1min的試驗，而無絕緣擊穿或閃絡(luò)現(xiàn)象。9.可靠性a.在電壓或返回電壓下，繼電器中的可動不應(yīng)停滯在中間位置。b.當(dāng)對線圈突然施加1.75倍的整定電壓激勵量時。電流I2l的方向從T2流向T1。由特性曲線可知，這時雙向可控硅觸發(fā)導(dǎo)通規(guī)律是按象限的特性進(jìn)行的，又因為觸發(fā)是正向的，所以把這種觸發(fā)叫做“象限的正向觸發(fā)”或稱為I+觸發(fā)。(2)如果主電極T2仍加正向電壓，而把觸發(fā)改為反向(圖5b)，這時雙向可控硅觸發(fā)導(dǎo)通后，通態(tài)電流的方向仍然是從T2到T1。我們把這種觸發(fā)叫做“象限的負(fù)觸發(fā)”或稱為I-觸發(fā)。(3)兩個主電極加上反向電壓U12(圖5c)，輸入正向觸發(fā)，雙向可控硅導(dǎo)通后，通態(tài)電流從T1流向T2。雙向可控硅按第三象限特性曲線工作，因此把這種觸發(fā)叫做Ⅲ+觸發(fā)。(4)兩個主電極仍然加反向電壓U12，輸入的是反向觸發(fā)(圖5d)。
不允許有嚴(yán)重的霉菌存在。技術(shù)指標(biāo)編輯編輯額定值：50Hz交流5A，波形畸變不超過2%。過流整定范圍為2-9.9A(無輔助電源)，級差為0.1A,電流整定值誤差不大于±3%。速動倍數(shù)整定范圍為2-9.9倍，級差為0.1倍，電流速動整定值誤差不大于±3%。繼電器的速動電流用電流整定值的倍數(shù)表示：速動電流速動倍數(shù)×整定電流。速動時間：繼電器任一整定點上，在1.2倍速動電流時的時間不大于50ms。返回系數(shù)：不小于0.9。反時限特性曲線方程：t：反時限時間K：延時曲線系數(shù)（整定范圍0.1～9.9）Is：整定電流值I：實際輸入電流值（注：I/Is不大于1.2為不推薦使用段）反時限特性時間整定誤差：a)當(dāng)I/Is2時,平均誤差不大于10%；
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以減小阻力，驅(qū)動功率，效率。（2）導(dǎo)軌磨損，防止導(dǎo)軌腐蝕。流動的油還起到?jīng)_洗作用。（3）避免低速重載下發(fā)生爬行現(xiàn)象，并振動。（4）高速時熱，熱變形。2）機(jī)床導(dǎo)軌油的選擇根據(jù)及數(shù)據(jù)，選用機(jī)床導(dǎo)軌油時主要考慮下列因素。（1）既作液壓介質(zhì)又作導(dǎo)軌油的油。根據(jù)不同類型的機(jī)床導(dǎo)軌的需要，可選同時用作液壓介質(zhì)的導(dǎo)軌油，既要導(dǎo)軌的要求，又是液壓的要求。例如對于像坐標(biāo)鏜床之類的機(jī)床，導(dǎo)軌油的黏度（50℃）應(yīng)選擇得高些（40～90mm2/s），但像各類磨床，常常將導(dǎo)軌油由液壓供給，而液壓的要求較高，必須，此時導(dǎo)軌一液壓油的黏度（50℃）應(yīng)選得低些（20～40mm2/s）。時間不大于0.15s。6.熱性能：當(dāng)周圍溫度為40℃時，繼電器能在長期允許電壓（見表1）下工作，無絕緣和其它元件損壞，其線圈溫升不超過65℃。7.過載能力：當(dāng)繼電器的線圈并聯(lián)時，在整定值處，使電壓均勻地自1.05倍整定電壓升至2.2倍整定電壓時，繼電器動合觸點不應(yīng)有不能工作的抖動。8.絕緣性能a.絕緣電阻不小于300MΩ。b.介質(zhì)強(qiáng)度繼電器各導(dǎo)電電路連在一起與外露的非帶電金屬部分及外殼之間，能承受2kV（有效值）、50Hz的交流電壓歷時1min的試驗，而無絕緣擊穿或閃絡(luò)現(xiàn)象。9.可靠性a.在電壓或返回電壓下，繼電器中的可動不應(yīng)停滯在中間位置。b.當(dāng)對線圈突然施加1.75倍的整定電壓激勵量時。
千萬不要將頭正對水箱向下看，擰開后迅速撤手，待無熱氣、蒸汽時，再取下水箱蓋，嚴(yán)防。冬季加熱水寒冷的冬季，發(fā)動機(jī)難起動，如果在起動前加注冷水就很容易在加水中或在加完水沒能及時起動時，在水箱下水室及進(jìn)水管處容易發(fā)生凍結(jié)，造成水無法循環(huán)，甚至使水箱漲裂。加注熱水，一方面能發(fā)動機(jī)的溫度便于起動；另一方面可盡量避免出現(xiàn)上述的凍結(jié)現(xiàn)象。防凍液要優(yōu)質(zhì)很多是以次充好。防凍液內(nèi)如果不含防腐劑則會嚴(yán)重腐蝕發(fā)動機(jī)缸蓋、水套、散熱器、阻水圈、橡膠件等部件，同時產(chǎn)生大量的水垢，使發(fā)動機(jī)散熱不良，造成發(fā)動機(jī)過熱故障。因此一定要選用廠的產(chǎn)品。及時補(bǔ)充軟水水箱內(nèi)加注防凍液后，如果發(fā)現(xiàn)水箱液面，在保證無外漏的前提下。