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this paper presents a solution for high voltage current transformers onsite ratio and angle errors measurements, using a an optical current transducer with fibber sensor, based on Faraday effect as reference standard, suitable for live line installation up to 550 kV. The system is described; its performance results are presented, as well as field applications and results. Some limitations that have to be overcome to obtain a reasonable measurement uncertainty are also discussed.

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This paper presents an alternative method for precision electrical power sources calibration. As traditional method, the proposed method uses a power and energy standard, but also employs a frequency standard. Calibration results for both methods are discussed and their advantages are pointed out.

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