Measuring transformer

An electric meter including an input measuring transformer for the measurement of current, said transformer comprising:

• a core of magnetizable material having an air gap;
• a measuring conductor disposed adjacent said core for carrying the current to be measured by the meter;
• a pre-magnetizing winding disposed adjacent said core for magnetic coupling therewith for carrying an alternating pre-magnetizing current;
• and
• an anisotropic thin film of magnetizing material positioned at the air gap of said core and responsive to a magnetic flux of said current to be measured and responsive to a magnetic flux of said pre-magnetizing current to become saturated in alternate directions of magnetization corresponding to alternating directions of said pre-magnetizing current whereby the point of time of the saturation of said film is dependent on the strength of the current to be measured.

A measuring transformer for the measurement of current or voltage comprising:

• a magnetic core having an air gap;
• a measuring conductor for carrying a current to be measured;
• a pre-magnetizing winding for carrying an alternating pre-magnetizing current, said measuring conductor and said pre-magnetizing winding being positioned relative to said magnetic core for linking magnetic fluxes of their respective currents with said magnetic core;
• and
• an anisotropic magnetic thin film comprising a ferromagnetic, magnetoresistive material having contact means for the connection of a current or voltage source, said air gap being bridged by said magnetic film, a surface of said film being parallel to a path of magnetic flux bridging said air gap, said film being linked by each of said magnetic fluxes for providing states of magnetization in alternate directions corresponding to alternate senses of said pre-magnetizing current whereby the point of time of the saturation of said film is dependent on the strength of the current to be measured.