A uniform procedure is a prerequisite to assure transmission line and station bus hardware is either free from visible corona or does not add any appreciable radio interference to that already being generated by the transmission line or substation conductors.This guide establishes uniform procedures for the testing of transmission line and station bus hardware in high voltage laboratories. Two tests are described, the first is a visual corona test, the second is a radio intereference voltage (RIV) test. This guide does not address the permissible radio intereference (RI) limits or specified corona extinction voltages. They are set either by regulation or by agreement between the utility and hardware manufacturer.
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