3. Inductive voltage dividers
The most common version of the inductive voltage divider consists of a set of cascaded transformers forming a network apparently similar to the resistive Kelvin-Varley divider; hence the name, sometimes used, of inductive Kelvin-Varley divider, which is not justified either by the operating principle or by the essential properties of the inductive divider.
3.1 Preliminary study
Our starting point is an autotransformer made from a ferromagnetic core with very high permeability, and fitted with identical windings (a dozen, for example), wound in such a way as to ensure a tight magnetic coupling: a bundle of pre-twisted wires with regular transposition is generally used, the wire spacing being reduced to the essential thickness of insulation (for voltages below 2 kV, we use enamelled wire...
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Inductive voltage dividers
Verification and calibration
References
Resistive dividers
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