Voltage Transformer

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Voltage Transformer

A Voltage Transformer (VT) 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 VT. 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 VT 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 Transformers

Types Of Voltage Transformers

  • Electromagnetic – The electromagnetic potential transformer is a wire-wound transformer.
  • Capacitor – Voltage transformers (CVT) use 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.

VT Ratio

The Voltage Sensor 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. We are a trusted supplier of Magnelab Voltage Transformers. See our VT range here.

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