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器KM閉合，把軟起動(dòng)器短接。即在起動(dòng)完成之后，大功率晶閘管處于不導(dǎo)通狀態(tài)，高次諧波對(duì)電網(wǎng)及電子設(shè)備的干撓。5）軟起動(dòng)器在通過電流時(shí)將會(huì)產(chǎn)生熱耗散，安裝時(shí)應(yīng)注意在其上、下方留出一定空間，以使空氣能流過其功率模塊。當(dāng)軟起動(dòng)器額定電流較大時(shí)，要采用風(fēng)機(jī)降溫。風(fēng)機(jī)的電源可取自電機(jī)控制的二次回路?？傊?，軟起動(dòng)器是一種新型的、性能優(yōu)良的起動(dòng)裝置，是交流異步電機(jī)起動(dòng)器的產(chǎn)品。但是由于軟起動(dòng)器主要為進(jìn)口產(chǎn)品，價(jià)格較高。主要特點(diǎn)在結(jié)構(gòu)上采用電動(dòng)機(jī)軟啟動(dòng)器作為控制輸出執(zhí)行元件，軟啟動(dòng)器（圖17）軟啟動(dòng)器（圖17）控制邏輯用PLC可編程控制器實(shí)現(xiàn)，使得結(jié)構(gòu)簡單明了，采用數(shù)字監(jiān)控和數(shù)字設(shè)定，了控制的可靠性。有利于保護(hù)設(shè)備的運(yùn)行?？刂票P上的顯示功能，便于在現(xiàn)場(chǎng)了解設(shè)備運(yùn)行情況。數(shù)字化參數(shù)設(shè)定及顯示功能直觀、方便、省時(shí)。[2]性能特點(diǎn)軟啟動(dòng)采用控制來啟動(dòng)電動(dòng)機(jī)，控制是以軟（件）控強(qiáng)（電）。其控制結(jié)果將電動(dòng)機(jī)啟動(dòng)特性由“硬”為“軟”，故被稱為“軟啟動(dòng)”。軟啟動(dòng)又分為兩種：一種是采用變頻恒轉(zhuǎn)矩限流啟動(dòng)；另一種是采用晶閘管調(diào)壓啟動(dòng)，又稱智能軟啟動(dòng)。兩類軟啟動(dòng)的對(duì)比：技術(shù)性能。采用變頻調(diào)速啟動(dòng)，啟動(dòng)時(shí)具有良好的靜、動(dòng)態(tài)性能，軟啟動(dòng)器（圖12）軟啟動(dòng)器（圖12）即使是在低速情況下也能隨意調(diào)節(jié)電動(dòng)機(jī)轉(zhuǎn)矩，能以恒轉(zhuǎn)矩啟動(dòng)電動(dòng)機(jī)，啟動(dòng)電流可以在的額定電流以下。采用智能軟啟動(dòng)，啟動(dòng)時(shí)由于轉(zhuǎn)矩是按電壓比的二次方減小。

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軟啟動(dòng)器只是改變電源電壓，相當(dāng)于降壓起動(dòng)器。變頻器要比軟啟動(dòng)器復(fù)雜得多，價(jià)格也貴得多。變頻器也有軟啟動(dòng)功能，是通過改變電源實(shí)現(xiàn)。高壓啟動(dòng)器和低壓啟動(dòng)器的區(qū)別軟啟動(dòng)器主回路采用晶閘管，通過逐步改變晶閘管的導(dǎo)通角來抬升電壓，完成啟動(dòng)，這是軟啟動(dòng)器的基本原理。在低壓軟啟動(dòng)器市場(chǎng)，產(chǎn)品繁多，但是高壓軟啟動(dòng)器產(chǎn)品還是比較少。高壓軟啟動(dòng)器與低壓軟啟動(dòng)器基本原理一樣，但是高壓軟啟動(dòng)器與低壓軟啟動(dòng)器相比，有些地方存在著其特殊性：高壓軟啟動(dòng)器在高壓下工作，各種電氣元器件的絕緣性能一定要好，電子芯片的抗能力要強(qiáng)。高壓軟起動(dòng)器組成電氣柜時(shí)，電氣元器件的布局以及與高壓軟啟動(dòng)器與其它電氣設(shè)備的連接也是非常重要的。因此電壓互感器的容量很小，一般都只有幾伏安、幾十伏安，也不超過一千伏安。詞條介紹了其基本結(jié)構(gòu)、工作原理、主要類型、接線、注意事項(xiàng)、異常與處理、以及鐵磁諧振等。中文名電壓互感器外文名Potentialtransber簡稱PT作用變換線路上的電壓解釋帶鐵心的變壓器組成主要由二次線圈、鐵心和絕緣所屬領(lǐng)域電力、能源涉及學(xué)科電學(xué)、電磁學(xué)目錄1基本結(jié)構(gòu)2工作原理3主要類型4銘牌標(biāo)志5接線6注意事項(xiàng)7異常與處理?常見異常?處理8鐵磁諧振?主要特點(diǎn)?辦法基本結(jié)構(gòu)編輯電壓互感器的基本結(jié)構(gòu)和變壓器很相似，它也有兩個(gè)繞組，一個(gè)叫一次繞組，一個(gè)叫二次繞組。兩個(gè)繞組都裝在或繞在鐵心上。兩個(gè)繞組之間以及繞組與鐵心之間都有絕緣。