Oil Type Current Transformers (TRA)

Euromek TRA series oil-immersed current transformers are designed to transfer current information safely and accurately to secondary levels for measurement and protection circuits in high-voltage substations.

In product design, primary current rating, accuracy class, short-circuit withstand capability, insulation level, environmental conditions and customer specifications are evaluated together. Each product undergoes manufacturing and testing processes in accordance with the requirements of applicable standards.

Key Features
• Voltage levels up to 550 kV
• Rated primary current up to 5000 A
• Design and testing processes in accordance with international standards
• Seismic design option up to 1g
• Structure compliant with the IEC 61869 series of standards
• Internal arc test report for Class 1 and Class 2 in accordance with the new IEC 61869-1 standard

General Information
The TRA series has been developed to provide reliable measurement and protection performance in high-voltage systems. The design is optimized by considering the insulation system, active part structure, oil impregnation and drying processes.
Different accuracy classes, number of cores, terminal arrangements and mechanical connection options can be applied depending on project requirements.

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TRA-17 TRA-24 TRA-36 TRA-52 TRA-72 TRA-123 TRA-145 TRA-170 TRA-245 TRA-300 TRA-362 TRA-420 TRA-550
Applicable Standards IEC / IEEE
Highest System Voltage (kV) 17,5 24 36 52 72,5 123 145 170 245 300 362 420 550
Power Frequency Withstand Voltage (kVrms) 38 50 70 95 140 230 275 325 460 460 510 630 680
Impulse Withstand Voltage (kVpeak) 95 125 170 250 325 550 650 750 1050 1050 1175 1425 1550
Rated Frequency (Hz) 50 / 60
Rated Primary Current (A) Up to 5000A
Rated Secondary Current (A) 1 / 5 (other values optional)
Maximum Short Time Thermal Current (Ith) Up to 63kA/1sec
Maximum Dynamic Current (Idyn) 2.5 x Ith (Up to 160)
Accuracy Class 0.1-0.2-0.2S-0.5-0.5S-1-3-5P-10P-PX