The Ferroresonant Transformer (Type) Voltage Regulator

  • Constant voltage transformer
  • Constant voltage regulator
  • CVT
  • Ferroresonant voltage regulator
  • Ferroresonant transformer
  • Ferro

The ferroresonant transformer or constant voltage transformer has a very long history having been invented in 1938 by Joseph Sola and continuing to sell tens of thousands of units per year. The ferro of today has had some minor improvements but remains fundamentally unchanged from the original design.

Well known for its longevity, some CVTs are found still in service after more than 40 years. Limited to single phase applications, the ferro is slowly being displaced by small electronic voltage regulators.

HOT & COSTLY

Should

Ferros

Be

Retired

?

Ferroresonant transformers typically operate at efficiencies of only 75% to 80%, and frequently operate at efficiencies as low as 50%. Modern electronic voltage regulators operate at efficiencies of 99% … at all times.

A case can be made for replacing all ferros, no matter how new.

WATCH VIDEO

Should Ferros Be Retired?

Ferroresonant transformers typically operate at efficiencies of only 75% to 80%, and frequently operate at efficiencies as low as 50%. Modern electronic voltage regulators operate at efficiencies of 99% … at all times.

A case can be made for replacing all ferros, no matter how new.

WATCH VIDEO

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