Research on High Altitude Corona Loss Measurement System Based on Small Corona Cage

In order to research on corona inception voltage characteristic of different altitude lines, a fiber digital high altitude corona loss measurement system is developed, which is based on virtual instrument technology, by small corona cage, relation to optical fiber transmission technology. In test, with gradually increasing the test voltage, Transmission lines begins to discharge, its corona loss is measured at the same time. Through test results of different altitude, it can be taken as estimation gist of corona inception voltage, to research on altitude correct on corona inception voltage. The result shows that the corona loss measurement system is feasible. The measurement system can be used to further study on the influence of air pressure, temperature, humidity to corona loss, making a foundation research on the corona loss law of EHV AC transmission line.