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Voltage Transformer

Voltage Transformer
Voltage Transformer
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Product Code : 37
Price And Quantity
  • Minimum Order Quantity
  • 1 Unit
  • Price Range
  • 15000.00 - 50000.00 INR/Unit
Product Specifications
  • Low Voltage
  • 110 Volt (V)
  • High Voltage
  • 440 Volt (V)
  • Product Type
  • Voltage Transformer
  • Material
  • Mild Steel
  • Usage
  • For Electric Supply Use
  • Weight
  • 50-150 Kilograms (kg)
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)

Class

Percentage voltage (ratio) Error

Phase Displacement (Minutes)

(1)

(2)

(3)

0.1

+0.1

+5

0.2

+0.2

±10

0.5

+0.5

±20

1

+1.0

40

3

+3.0

-

Measuring Voltage Transformer :



A Class

Application

0.2

For very accurate power measurement and tariff metering

0.5

For very accurate power measurement and tariff metering

1

For meters measuring voltage and power

3P/6P

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

1.2

Continuous

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

1.2

Continuous

Between phase and earth in an effectively earthed neutral

system.

1.5

For 30 seconds

1.2

Continuous

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

1.9

For 30 seconds

1.2

Continuous

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

1.9

For 8 hours

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

Trade Information
  • Payment Terms
  • Cheque, Cash on Delivery (COD)
  • Supply Ability
  • 1 Unit Per Day
  • Delivery Time
  • 1 Week
  • Main Export Market(s)
  • Africa, Middle East, Western Europe, Eastern Europe, South America, North America, Central America, Australia, Asia
  • Main Domestic Market
  • All India

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