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Inductive Voltage Transformers

Oil Immersed Voltage Transformers


Inductive Voltage Transformers

Inductive Voltage Transformers (IVT), are used for voltage metering and protection in high voltage network systems. They transform the high voltage into low voltage adequate to be processed in measuring and protection instruments secondary equipment, such as relays and recorders).

EMEK manufactures oil/paper insulated instrument transformers up to 550kV nearly 100.000 units since 1969.

Features of this design and contraction include:

  • Hermetically Sealed Construction

  • High Seismic Performance

  • Stainless Steel, Aluminium and/or Hot deep galvanized metal parts

  • Durability in extreme weather conditions

  • Long life time expectancy

Frequency : 50Hz, 60Hz

Standards : TSE, IEC, ANSI, GOST, BS&AS and other standards upon request

Insulators : Porcelain or Composite Polymer Insulators

Insulating Oil : Mineral oil in conformity with standards

Maintenance : Maintenance free

Spare Parts : No special tools, no serviceable parts or spare parts are required

Highest System Voltage24 kV36 kV72,5 kV125 kV145 kV170 kV
One minute power frequency voltage325 kV rms325 kV rms325 kV rms325 kV rms325 kV rms325 kV rms
Lightning impulse voltage750 kV Peak750 kV Peak750 kV Peak750 kV Peak750 kV Peak750 kV Peak
Rated frequency50/60 Hz50/60 Hz50/60 Hz50/60 Hz50/60 Hz50/60 Hz
Short time thermal current
Dynamic withstand current
Total Creepage Distance25/31mm/kV25/31mm/kV25/31mm/kV25/31mm/kV25/31mm/kV25/31mm/kV
Rated capacitance
Secondary Voltage
Rated Voltage Factor
Technical Details
Type Tests


  • 50 Hz, 60 Hz

Secondary Current

  • 100/√3, 110/√3, others on request.

Rated Voltage factor

  • 1.2 cont/1,5 30 sec- 1,9 30 sec - 1,9 8 hours


  • Oil impregnated paper, high dielectric strength, low dielectric losses.
  • Graded layers with well rounded edges enable a uniformly distributed field over the whole unit.

Insulating Oil

  • The insulating oil is mineral oil in conformity with IEC 60296.
  • Before impregnation, moisture and gases are removed from the oil by special processes.
  • Drain plug for taking samples and oil refilling facilities are provided on request.
  • Floating type oil level indicator is standard supply.

Oil Impregnation

  • Heat and vacuum are applied to the fully insulated windings after assembly of the current transformer for drying purposes, followed immediately by the oil impregnation procedure.

Hermetic Seal

  • Oil volume variations are compensated with stainless steel bellows placed in the head of the transformers. With this facility there will be no contact between air and oil in the transformers.
  • The dielectric strength will remain unchanged for the life time of the VT.


  • Brown, Grey glazed porcelain or polymer.

Primary Terminals

  • Primary terminals are made from tin plated copper, brass or aluminium.
  • Vertical and horizontal primary terminals are available.
  • Stud, nema pad or clamp type primary terminals are available.


  • Grain oriented silicon steel is used.
  • Enamelled electrolytic copper wire is used for primary and secondary winding.


  • All bracelets used on transformers are made from aluminium alloy.


  • The housing head is fabricated from corrosion protected aluminium.
  • Every housing is subject to pressure and vacuum test before assembly.

Base Plate

  • Base of the transformers are fabricated from steel and galvanised.

Name Plate

  • Name plates are stainless steel and weatherproof.

Secondary Terminal Box

  • Hinged type boxes are used and are sealable on request. They are made of galvanized steel or stainless steel.
  • Clamp type secondary terminals are used. Other secondary terminals are available on request. Earthing
  • Earthing terminals are located on the base of the transformers.
  • Clamp type terminals are available on request.


  • External surface of the transformers, which are already corrosion protected, are additionally painted grey. Other colours are available on request.

Earthquake Design

  • Standard design is up to 0.6g.

Ambient Temperature

  • Standard design is suitable for temperature range -50 °C to +50°C. Other ranges on request. Mechanical Strength
  • Applied load to the primary terminal in horizontal and vertical is in conformity with related IEC standards.


  • Standard design is suitable up to 1000 m above sea level.

Optional Accessories

  • Capacitive tap
  • Steel support structure
  • Primary connectors
  • Marshalling box


  • Maintenance free, simple recommendations;
  • Clean the porcelain bushing at regular intervals depending on the degree of pollution.
  • Ensure that there is no oil leakage.

Spare Part & Special Tools

  • There are no user serviceable parts, therefore no spare parts or special tools are required for maintenance.


  • Before the assembly, following visual checks should be made;
  • There are no oil leaks,
  • The porcelain is not damaged,
  • The aluminium protective cover on the bellows is not damaged,
  • There is no damage on the primary terminals,
  • The oil level indicator indicates sufficient oil level.


  • The transformers are packed in rugged wooden crates which are suitable for overseas transportation.
  • The transformers are encapsulated in polyethylene covers to keep them from environmental effects.
  • Wooden crates can be lifted by either a fork lift or by a crane with slings.
  • Other technical specifications may be available upon request.
Balıkhisar Mahallesi, Köyiçi Kümeevleri No: 574, Akyurt, 06750 Ankara - Türkiye
(+90) -312 -398 -0181
(+90) -312 -398 -0474
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About Us

Emek is a labor-independent, internationally operating manufacturer of instrument transformers.

Its reliable and high quality products have been repeatedly tested in local and international laboratories. Its experience has been strengthened with transformers working in the system for half a century, it has improved and renewed itself every day.

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