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IMAGES OF VOLTAGE TRANSFORMERS INCLUDING TYPES AN DEFINITIONS

IMAGES OF VOLTAGE TRANSFORMERS INCLUDING TYPES AN DEFINITIONS
Images and Illustration of a typical voltage transformer for medium and high voltage level.

A voltage transformer or potential transformer is an instrument transformer intended to have its primary winding connected in shunt with a power supply circuit, the voltage of which is to be measured or controlled.


image of a voltage transformer


instrument transformer

A cascade-type voltage transformer is a single high-voltage line terminal voltage transformer with the primary winding distributed on several cores with the cores electromagnetically coupled by coupling windings and the secondary winding on the core at the neutral end of the highvoltage winding. Each core of this type of transformer is insulated from the other cores and is maintained at a fixed potential with respect to ground and the line-to-ground voltage.

A double-secondary voltage transformer is one that has two secondary windings on the same magnetic circuit insulated from each other and the primary. Either or both of the secondary windings may be used for measurements or control.

A grounded-neutral, terminal-type voltage transformer is one that has the neutral end of the high-voltage winding connected to the case or mounting base.

An insulated-neutral, terminal voltage transformer is one that has the neutral end of the high-voltage winding insulated from the case or base and connected to a terminal that provides insulation for a lower voltage insulation class than required for the rated insulation class of the transformer.

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