描述
變壓器的空載電壓一般是指在變壓器初級(jí)線圈中通入額定電壓，而次級(jí)線圈再不接負(fù)載的情況下的電壓。一般可用于檢查變壓器高低壓線圈以及鐵心磁路是否存在問題，還可以校正變壓器的變比是否符合使用要求，若是無載調(diào)壓變壓器在不符合變壓比時(shí)可進(jìn)行分接開關(guān)的調(diào)節(jié)。降壓變壓器的空載電壓一般都比標(biāo)稱二次電壓略低一些，以保證帶載后電壓滿足能使用要求。如果超出過多可進(jìn)行相應(yīng)的檢查，或適當(dāng)帶一些輕載，看看電壓能否達(dá)標(biāo)。如果嚴(yán)重超標(biāo)則應(yīng)立即停運(yùn)，否則可能造成二次線圈的損壞。
絕大部分配電變壓器都是直接接地的，接地體與大地的泥土不管怎樣處理，總會(huì)有一定的電阻，所以變壓器接地有接地電阻。
變壓器的最基本形式，包括兩組繞有導(dǎo)線之線圈，并且彼此以電感方式稱合一起。當(dāng)一交流電流（具有某一已知頻率）流于其中之一組線圈時(shí)，于另一組線圈中將感應(yīng)出具有相同頻率之交流電壓，而感應(yīng)的電壓大小取決于兩線圈耦合及磁交鏈之程度。? 模擬量的濾波是為了保證變頻器獲得的電壓信號(hào)或電流信號(hào)能真實(shí)地反映實(shí)際值，消除干擾信號(hào)對(duì)頻率給定信號(hào)的影響。濾波的工作原理是數(shù)字信號(hào)處理，即數(shù)字濾波。濾波時(shí)間常數(shù)就是特指模擬量給定信號(hào)上升至穩(wěn)定值的63%所需要的時(shí)間（單位為s）。濾波時(shí)間的長短必須根據(jù)不同的數(shù)學(xué)模型和工況進(jìn)行設(shè)置。濾波時(shí)間太短，當(dāng)變頻器顯示“給定頻率”時(shí)有可能不夠穩(wěn)定而呈閃爍狀；濾波時(shí)間太長，當(dāng)調(diào)節(jié)給定信號(hào)時(shí)，給定頻率跟隨給定信號(hào)的響應(yīng)速度會(huì)降低。一般而言，出于對(duì)抗干擾能力的考慮，需要增加濾波時(shí)間常數(shù)；處于對(duì)響應(yīng)速度快的考慮，需要降低濾波時(shí)間常數(shù)。模擬量通道的增益參數(shù)與上面的頻率增益不一樣，后者主要是為定義頻率給定曲線的坐標(biāo)值，前者則是在頻率給定曲線既定的前提下，降低或者提高模擬量通道的電壓值或者電流值。
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