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Voltage Transformer

Voltage Transformer

15000.00 - 50000.00 INR/Unit

Product Details:

  • Low Voltage 110 Volt (V)
  • High Voltage 440 Volt (V)
  • Material Mild Steel
  • Usage For Electric Supply Use
  • Weight 50-150 Kilograms (kg)
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Voltage Transformer Price And Quantity

  • 1 Unit
  • 15000.00 - 50000.00 INR/Unit

Voltage Transformer Product Specifications

  • For Electric Supply Use
  • 50-150 Kilograms (kg)
  • Mild Steel
  • 110 Volt (V)
  • 440 Volt (V)

Voltage Transformer Trade Information

  • Cash on Delivery (COD) Cheque
  • 1 Unit Per Day
  • 1 Week
  • Asia Australia North America South America Eastern Europe Western Europe Middle East Central America Africa
  • All India

Product Description

There are following types and Sub types of V.Tr.

  • L.T. Tape insulated varnish impregnated type Voltage Transformer, 1Ph/3Ph
  • L.T/H.T Cast Resin type Voltage Transformer, 1Ph/3Ph upto 33KV
  • H.T. Outdoor Oil Cooled type Voltage Transformer upto 66 KV
  • H.T. Cast Resin / Oil Filled type Residual Voltage Transformer for Capacitor Bank protection

Function of voltage Transformer

The main function of the Voltage Transformer is to reproduce the Primary Voltage on its secondary side. The Voltage Transformer isolates the devices connected to their secondary circuit from the network system. Voltage Transformers are specially designed for measuring and protection applications.

Standard Range:

The standard range for L.T. applications is generally 415/110,433/110V,\Ph or 3Ph type. Sometimes three single phase modules are connected in star to form a three phase system

The standard range for H.T applications is as under

  • 3300/Rt3/110/Rt3 for Single Phase, 3300/110O for Three phase system
  • 6600/Rt3/110/Rt3 for Single Phase, 6600/110 for Three phase system
  • 11000/Rt3/110/Rt3 for Single Phase, 11000/110 for Three phase system
  • 22000/Rt3/110/Rt3 for Single Phase, 22000/110 for Three phase system
  • 33000/Rt3/110/Rt3 for Single Phase, 33000/110 for Three phase system
  • 66000/Rt3/110/Rt3 for Single Phase, 66000/110 for Three phase system

Limits of voltage Error and phase Displacement (Clause 5.1)


Percentage voltage (ratio) Error

Phase Displacement (Minutes)



















Measuring Voltage Transformer :

A Class



For very accurate power measurement and tariff metering


For very accurate power measurement and tariff metering


For meters measuring voltage and power


For protection application like over voltage relay

Following are the VA Burdens as per IS 3156:

5 VA;10 VA,15 VA,25 VA,50VA,100VA, 200VA

Standard Terminology used for Voltage, Transformers:

Rated primary voltage : This is the rated voltage required to be stepped down for measurement and protective purposes.

Rated secondary voltage : The voltage at which the meters and protective devices connected to the secondary of the voltage transformer operate.

Rated burden : This is the load in terms of volt- amperes (VA) posed by the devices connected in the secondary circuit on the VT.

Accuracy class required : The transformation errors that are permissible, including voltage (ratio) error and phase angle error. Phase error is specified in minutes. Typical accuracy classes are Class0.2, 0.5, Class 1 and Class 3. Both metering and protection classes of accuracy are specified. In a metering VT, the VT is required to be within the specified errors from 80% to 120% of the rated voltage. Ina protection VT, the VT is required to be accurate from 5% upto the rated voltage factor times the rated voltage.

Rated voltage factor : Depending on the system in which the VT is to be used, the rated voltage factors to be specified are different. The table below is adopted from Indian and International standards.

Rated voltage factor

Rated time

Method of connecting primary winding in system



Between phases in any network Between transformer star-point and earth in any network



Between phase and earth in an effectively earthed neutral



For 30 seconds



Between phase and earth in a non-effectively earthed neutral system with automatic fault tripping


For 30 seconds



Between phase and earth in an isolated neutral system without automatic fault tripping or in a nresonant earthed system without automatic fault tripping


For 8 hours

Temperature class of insulation: The permissible temperature rise over the specified ambient temperature. Typically, classes E, Band F.

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