FIELD: measurement technology. SUBSTANCE: instrument current transformer includes first transformer with primary and secondary windings, light-emitting diode, light guide, two amplifiers and five resistors. It is supplemented with second transformer similar to first transformer. Third transformer, two stabilizer diodes, rectifier and low-frequency filter are brought-in in the capacity of independent power supply source. EFFECT: increased measurement precision and reduced mass and dimensions. 1 cl, 2 dwg
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