FIELD: electricity.
SUBSTANCE: device contains current transformer, instrument shunt, supplemental voltage unit, integrator with adding element at input, the first input of which is connected to instrument shunt and the second input is connected to secondary winding of current transformer; bipolar relay element connected to integrator output; signal heteropolarity detector the first input of which is connected in parallel to instrument shunt and the second input is connected to integrator output; logic "AND" gate with inversion at output, the inputs of which are connected to outputs of relay element and signal heteropolarity detector, and its output signal controls the supplemental voltage unit, series-connected in circuit of current transformer and instrument shunt.
EFFECT: reducing error of current measurement in transient modes.
2 cl, 3 dwg
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