MEASURING TRANSFORMER Russian patent published in 2007 - IPC G01R17/10 

FIELD: measuring equipment engineering.

SUBSTANCE: measuring transformer contains two differentially connected primary transformers (sensors), connected serially in a circuit with power source and separated by third transformer, two measuring amplifiers, subtracter, adder and division block. Inputs of first measuring amplifier are connected to non-adjacent outputs of first primary transformer and third transformer enabled serially with it. Inputs of second measuring amplifier are connected to non-adjacent outputs of second primary transformer and third transformer connected serially with it. Output of first measuring amplifier is connected to direct input of subtracter, to inverting input of which output of adder is connected, and output of second measuring amplifier is connected to one of inputs of adder, to second input of which output of subtracter is connected. Outputs of subtracter and adder are connected, respectively, to inputs of dividend and divisor of division block.

EFFECT: simplified construction, increased measurement precision due to decreased number of elements in measuring chain.

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