ELECTROMETRIC CURRENT TRANSFORMER Russian patent published in 2006 - IPC H03F3/34 G01R19/00 

FIELD: technology for measuring lesser currents in various technical areas.

SUBSTANCE: transformer (with N transformation ranges) contains operation amplifier, output of which through filter is connected to input current source, and negative check connection circuit is formed by N-1 serially connected current indicators, each one of which is formed by resistor and voltage limiter connected in parallel, N-1 voltage repeaters and N differential amplifiers, while output of Nth differential amplifier is an informational output for Nth transformation range. Current transformer additionally includes N-1 linear transformers, each one of which contains serially connected current indicator model, operation amplifier with resistor in negative check connection circuit and scaling amplifier, output of which acts as informational output for appropriate transformation range. Current indicator model in each nonlinear transformer is formed by parallel connection of modeling resistor and voltage limiter. Voltage limiters in current indicators and in current indicator models appropriate for these are made using nonlinear elements, having synchronized parameters and combined within one crystal.

EFFECT: increased operation precision of electrometric current transformation within broad range of temperatures.

2 cl, 1 dwg