这篇文章这儿所说的中压变频器，是指电压等级从750v～2300v的变频器，分为两个电压等级，1140v和2300v两种类型的变频器。这种类型的变频器负载通常都是油田上用的潜油电泵，1140v的还有用于抽油机的。我们简要说一下设备调试方法。
1.　设备进程
(1)接控制线
供认原工频工作时的工作情况，首要要了解潜油电泵的工作进程。
潜油电泵是一种深置于井下1000m—3000m的电泵，因为电缆线较长，地面上的供电设备要能赔偿这有些电缆损耗，因而原工频设备要供给比电机额外电压高出100—300v的供电电压。
电泵及电缆都是高温、高压的设备，在设备前都要进行绝缘检验。用2500v的兆欧表检验，绝缘电阻不应低于50mω。
要查看正本的工频供电的电压及工作电流，以便调试时参看。
因为油田上潜油电泵下泵的深度不一样，潜油电泵供电的电压就有所不一样。因而对应于同一电压等级的变频器而言，就有不一样的电压输入，变频器的控制电压就有所不一样。为了处理这一疑问，笔者在变频器内部设备了一个变压器，对应于不一样的电压输入，电压输出都是一样的。关于这类变频器，其输出都只需220v、110v、380v三组电压。220v是给控制电路供电的，110v是给电机维护仪供电的，380v是给电压表供电的。其控制接线如图2示。

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