描述
變壓器的空載電壓一般是指在變壓器初級線圈中通入額定電壓，而次級線圈再不接負載的情況下的電壓。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可進行分接開關(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。如果超出過多可進行相應的檢查，或適當帶一些輕載，看看電壓能否達標。如果嚴重超標則應立即停運，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，包括兩組繞有導線之線圈，并且彼此以電感方式稱合一起。當一交流電流（具有某一已知頻率）流于其中之一組線圈時，于另一組線圈中將感應出具有相同頻率之交流電壓，而感應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或電流信號能真實地反映實際值，消除干擾信號對頻率給定信號的影響。濾波的工作原理是數(shù)字信號處理，即數(shù)字濾波。濾波時間常數(shù)就是特指模擬量給定信號上升至穩(wěn)定值的63%所需要的時間（單位為s）。濾波時間的長短必須根據(jù)不同的數(shù)學模型和工況進行設(shè)置。濾波時間太短，當變頻器顯示“給定頻率”時有可能不夠穩(wěn)定而呈閃爍狀；濾波時間太長，當調(diào)節(jié)給定信號時，給定頻率跟隨給定信號的響應速度會降低。一般而言，出于對抗干擾能力的考慮，需要增加濾波時間常數(shù)；處于對響應速度快的考慮，需要降低濾波時間常數(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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