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Differential protection schemes for busbars, generators or transformers connect multiple current transformers in parallel across a common burden. This paper describes the techniques used to simulate such an arrangement and concentrates particularly on the 3 CT case. Index Terms--B-H loop, hysteresis, current transformers, simulation.

The hysteresis loop of the core material in a test CT is simulated using the Jiles-Atherton theory. Comparisons are made between recorded and simulated waveforms and it is found necessary to replace the modified Langevin function used by Jiles and Atherton. Using an alternative function described in the paper, good agreement is achieved between test and simulated waveforms. Index Terms--B-H loop, current transformers, hysteresis, simulation.