Peculiarities of current sensors used in contemporary electric energy metering devices

An electricity meter is a tool that determines the amount of electricity transferred to the network by a producer and consumed by electrically powered loads. Metering devices are composed of sensitive sensors that simultaneously measure currents and voltages and a microprocessor, which calculates required values basing on the received data. This article gives an overview of the most common current sensors, which are used in contemporary electricity metering devices. Their principles, advantages and disadvantages are reviewed, conclusions about the external influences on the sensors, which can lead to the incorrect operation of a meter and wrong definition of consumed electricity, are made.