Voltage Transformer

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What are Voltage Transformers

A Voltage Transformer is a device which converts energy of one form to another. VT’s are used to monitor alternating AC or DC current by measuring voltage directly or through a voltage transformer. Voltage transformers are a parallel connected type of instrument transformer. They are designed to present negligible load to the supply being measured.  They have an accurate voltage ratio and phase relationship to enable accurate secondary connected metering.

The Voltage Transformer is seen as an electrical component instead of an electronic component. A transformer is a very simple static electro-magnetic passive electrical device that works by converting electrical energy from one value to another.

Voltage transformer

Types Of Voltage Sensor

  • Electromagnetic – The electromagnetic potential transformer is a wire-wound transformer.
  • Capacitor – The capacitor voltage transformer (CVT) uses a capacitance potential divider using higher voltages due to lower costs than an electromagnetic VT’s.
  • Optical – An optical voltage transformers make use of the Faraday effect which rotates polarised light in optical materials.
Voltage Transformer

Ratio

The Voltage Transformer is typically described by its voltage ratio from primary to secondary. Meaning a 500:120 PT provides an output voltage of 120 volts when 500 volts are input across its primary winding.

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