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.
| 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 | ||||||||||||