Voltage and potential transformers that are designed for monitoring single-phase and three-phase line voltages in power-metering applications are used mainly as step-down devices. They are designed ...

Commercial The commercial class transformers are well suited for low power current monitoring applications. ANSI Class The ANSI metering class transformers are units ...

[Renaud] built a AC power meter from scratch ... The first is a typical voltage stepdown transformer. This brings the AC line voltage down to +/- 10V, which is more amenable to digital sampling.