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UHF couplers for gas-insulated substations: a calibration technique

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3 Author(s)
M. D. Judd ; Centre for Electr. Power Eng., Strathclyde Univ., Glasgow, UK ; O. Farish ; J. S. Pearson

Methods that have been used to evaluate the performance of UHF couplers for partial discharge monitoring of gas-insulated substations are briefly reviewed, illustrating the need for a standard test procedure. A measurement scheme is proposed in which the coupler is mounted beneath an aperture in a ground plane and subjected to an incident electric field of known intensity. A TEM line is used to evaluate the technique, and a step excitation is shown to have advantages over swept frequency measurements. The frequency responses of two disc couplers and an external window coupler are measured to demonstrate the technique

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IEE Proceedings - Science, Measurement and Technology  (Volume:144 ,  Issue: 3 )