Selfcalibrated primary alternative current ratio standard

Primary alternative current ratio standard, including 3 standard current transformers and precise comparator, used for comparison of the standard current transformers and for their selfcalibration is described. The results of the intercomparison of the intercomparison of the created standard with Russian Federation one are given. The data, turned out during intercomparison and selfcalibration, have shown that procedure of selfcalibration permits to find the uncertainty of the standard current transformer with enough accuracy.