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Epoxy Resin Current Transformers



Current transformer (CT) is used for measurement of Current & protection of major components and to provide continuity of operation in power system. When current in a circuit is too high to directly apply to measurement or protection relays, a current transformer produces a reduced current accurately proportional to the current in the circuit, which can be conveniently connected to measuring and recording instruments. Current transformer also isolates the measuring instruments from what may be very high voltage in the monitored circuit. It commonly used in metering and protective relays in the electrical power industry.

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

Indoor or outdoor cyclooliphatic epoxy resin is used. Hydrophobic.

Maintenance : Maintenance free

Spare Parts : No special tools, no serviceable parts or spare parts are required. (HKEP) material can be used if required.

Rated Voltage
Highest System Voltage1,2 kV36 kV72.5 kV145 kV
One minute power frequency voltage6kV rms70kV rms140kV rms275 kV rms
Lightning impulse voltage170 kV Peak325 kV Peak650 kV Peak
Rated frequency50/60 Hz50/60 Hz50/60 Hz50/60 Hz
Short time thermal current63kA rms/3 secc25kA rms/3 sec31.5kA rms/3 sec40kA rms/3 sec
Dynamic withstand current157.5kA Peak
Primary Current'Upto 4000A & higher currents can also be supplied on request'Upto 4000A & higher currents can also be supplied on requestUpto 4000A & higher currents can also be supplied on requestUpto 4000A & higher currents can also be supplied on request
Technical Details
Type Tests


  • 50 Hz, 60 Hz

Secondary Current

  • 1 A, 2 A or 5 A, others on request.

Primary Current

  • up to 4000 A

Thermal and Dynamic Ratings

  • Short time thermal current ratings up to 63 KA/ 1 sec and dynamic current ratings up to 157,5 KA peak.

Continuous Thermal Current

  • 1.2 x In continuous (up to 2.0 x In or higher on request).

Insulation Epoxy Resin

  • High dielectric strength, low dielectric losses.

  • Graded layers with well rounded edges enable a uniformly distributed field over the whole unit.

Insulating Oil

  • Indoor, Outdoor and hydrophobic (HCEP) material is used depending on requirement.


  • Brown or gray epoxy resin.


  • Grain oriented silicon steel is used.

  • The core shapes are toroidal with or without air gap.

  • Electrolytic copper suitable to withstand rated continuous current and short time thermal current is used for primary winding.

  • Enamelled electrolytic copper wire is used for Secondary winding.

Base Plate

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

Name Plate

  • Name plates are stainless steel or alumunium.

Ambient Temperature

  • Standard design is suitable for temperature range -50 °C to +50°C. Other ranges on request.


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

Spare Part & Special Tools

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


  • 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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