METHOD OF COMPENSATING FOR ERRORS OF MEASURING CURRENT TRANSFORMER IN CONSIDERATION OF HYSTERESIS CHARACTERISTICS OF CORE

摘要

A method of compensating for the errors of a measuring current transformer in consideration of the hysteresis characteristics of a core is disclosed. Secondary current is measured at predetermined time intervals, and a secondary voltage is calculated based on the secondary current. Magnetic flux is calculated based on the secondary voltage, and a reference value for selecting magnetic flux-magnetizing current relationship information and secondary voltage-core loss current relationship information is calculated based on the calculated magnetic flux. The magnetic flux-magnetizing current relationship information and the secondary voltage-core loss current relationship information are selected. The value of the magnetizing current for the magnetic flux is calculated. The value of core loss current for the secondary voltage is calculated based on the secondary voltage and the secondary voltage-core loss current relationship information. Exciting current and compensation current are calculated.