Self-powered electrical measuring system isolated from electrical perturbances.

摘要

A self-powered electrical measuring system for measuring current in a high voltage circuit. The system comprises a Rogowski coreless coil disposed about a conductor for sensing current flowing in the conductor and producing a voltage signal proportional to the magnitude of the current. An electronic conditioning circuit is provided for conditioning the voltage signal for transmission by optical link means to a remote receiver operating which is at ground potential and totally isolated from the measuring system in the high voltage circuit. A floating supply circuit comprising a tapping coil having a magnetic core disposed about the conductor is provided whereby to produce a supply voltage for the electronic conditioning circuit means.