Unconventional Methods of Current Detection and Measurement in EHV and UHV Transmission Systems

Magneto-optical fibre sensors for electrical industry: analysis of performances

“…The Faraday effect was the first magneto-optical effect to be proposed and demonstrated in fibre current sensors [1] and still is the most viable approach because of the substantial Verdet constant V that is available in several glasses [8] and in ordinary fibres. The Verdet constant relates the line integral of the magnetic field strength H to the rotation O of the polarisation plane of a linearly polarised wave propagating along the line L:…”

“…In power systems applications, fibre optic sensors attract considerable interest in view of the well known characteristics of passive structure, intrinsic insulation, noninvasiveness and improved performances (especially bandwidth) in respect to conventional devices [1,2]. To date, a number of fibre optic sensors have been shown to be feasible, either as fixed-installation replacements of existing devices or as probes for special-purpose instruments [3][4][5][6][7].…”

A new electromagnetic current transformer for EHV power systems

“…1 Considering all the above-mentioned facts, there is a definite need for a new type of current transformer particularly for systems above 230 kV. During the last decade several new unconventional current transformers have been suggested and many research papers and patents have been published [3]. All proposed unconventional current transformers contain two basic parts, a high potential unit located in the vicinity of the high-power line (HPL) conductor and a low potential (usually ground) unit.…”