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.
|Highest System Voltage||1,2 kV||36 kV||72.5 kV||145 kV|
|One minute power frequency voltage||6kV rms||70kV rms||140kV rms||275 kV rms|
|Lightning impulse voltage||170 kV Peak||325 kV Peak||650 kV Peak|
|Rated frequency||50/60 Hz||50/60 Hz||50/60 Hz||50/60 Hz|
|Short time thermal current||63kA rms/3 secc||25kA rms/3 sec||31.5kA rms/3 sec||40kA rms/3 sec|
|Dynamic withstand current||157.5kA Peak|
|Primary Current||'Upto 4000A & higher currents can also be supplied on request'||Upto 4000A & higher currents can also be supplied on request||Upto 4000A & higher currents can also be supplied on request||Upto 4000A & higher currents can also be supplied on request|
Thermal and Dynamic Ratings
Continuous Thermal Current
Insulation Epoxy Resin
High dielectric strength, low dielectric losses.
Graded layers with well rounded edges enable a uniformly distributed field over the whole unit.
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.
Spare Part & Special Tools
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.
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.