描述
变压器的空载电压一般是指在变压器初级线圈中通入额定电压，而次级线圈再不接负载的情况下的电压。一般可用于检查变压器高低压线圈以及铁心磁路是否存在问题，还可以校正变压器的变比是否符合使用要求，若是无载调压变压器在不符合变压比时可进行分接开关的调节。降压变压器的空载电压一般都比标称二次电压略低一些，以保证带载后电压满足能使用要求。如果超出过多可进行相应的检查，或适当带一些轻载，看看电压能否达标。如果严重超标则应立即停运，否则可能造成二次线圈的损坏。
绝大部分配电变压器都是直接接地的，接地体与大地的泥土不管怎样处理，总会有一定的电阻，所以变压器接地有接地电阻。
变压器的最基本形式，包括两组绕有导线之线圈，并且彼此以电感方式称合一起。当一交流电流（具有某一已知频率）流于其中之一组线圈时，于另一组线圈中将感应出具有相同频率之交流电压，而感应的电压大小取决于两线圈耦合及磁交链之程度。 模拟量的滤波是为了保证变频器获得的电压信号或电流信号能真实地反映实际值，消除干扰信号对频率给定信号的影响。滤波的工作原理是数字信号处理，即数字滤波。滤波时间常数就是特指模拟量给定信号上升至稳定值的63%所需要的时间（单位为s）。滤波时间的长短必须根据不同的数学模型和工况进行设置。滤波时间太短，当变频器显示“给定频率”时有可能不够稳定而呈闪烁状；滤波时间太长，当调节给定信号时，给定频率跟随给定信号的响应速度会降低。一般而言，出于对抗干扰能力的考虑，需要增加滤波时间常数；处于对响应速度快的考虑，需要降低滤波时间常数。模拟量通道的增益参数与上面的频率增益不一样，后者主要是为定义频率给定曲线的坐标值，前者则是在频率给定曲线既定的前提下，降低或者提高模拟量通道的电压值或者电流值。
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