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4. Current comparators
4.1 Principle
Designed to achieve very high accuracies, they are used, for example, as standards for precision testing of current transformers. There are a large number of possible versions of these devices, but they are all based on the same principle: comparison of primary and secondary currents by means of a current transformer and supply of the power required for the secondary Joule losses and the load by means of an auxiliary source, which may be a second current transformer (Figure
15
), an electronic amplifier (Figure
16
) or a combination of the two (Figure
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Current comparators
Magneto-optical current transformers. Faraday effect
Bibliography
Conventional instrument transformers
Standardization
France (UTE)
French Standards Association (AFNOR)
- Transformateurs de tension monophasés : caractéristiques. - NF C 42-501 - 3-73
- Transformateurs de courant : caractéristiques. - NF C 42-502 - 2-74
Germany (Federal Republic of)
Verband Deutscher Elektrotechniker eV (VDE)
- Specifications for instrument transformers: 1re, 2nd and 3rd parts (Modif. 1 to 2-78). - 0414 -...
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