Electricity meter with isolated shunt

摘要

An electricity meter includes a voltage transformer 401 and a shunt resistor 19. The shunt has first 404a and second 404b shunt terminals. The transformer has a core and primary 701 and secondary 703 windings. The terminals of the shunt are connected to the first and second ends of the primary transformer winding, and the secondary windings 403a and 403b of the transformer are connected to a control device 402 to provide a voltage for measurement by the control device. The control device is configured to determine a current consumption. The electricity meter can optionally apply a correction to a voltage measured by the control device based on a temperature of the voltage transformer. The meter may also have a casing with a high magnetic saturation flux, possibly low carbon extra deep drawing steel.