Multi-circuit electricity metering

摘要

A multi-circuit electricity metering apparatus to be used for metering the power and energy consumption in the branch circuits of an electricity distribution system within a premises provides a plurality of non-contact current sensors connected to a plurality of compact metering devices each of which comprises only the electronic components necessary for metering the power and energy consumption in the circuits being metered. The said plurality of metering devices are interconnected via a multi-wire bus with each other and with a common low-voltage power-supply apparatus and with a common AC voltage-sensing apparatus and with a common data-logging apparatus. Preferably the said non-contact current sensors are miniature Rogowski coils. Advantageously the said non-contact current sensors are multi-turn coiled Rogowski coils. Preferably each of the said metering devices together with the said current sensors connected to is of sufficiently small size that it can be supported by the conductors of the circuits that is being used to meter. The said multi-circuit metering apparatus provides means of communicating with a remote computer system for the purposes of transmitting recorded data to the remote computer and for the purpose of receiving configuration data or updated control programmes from the remote computer.