The electromagnetic radiation environment of 750 kV single cycle parallel transmission line was calculated and predicted by adopting the calculation model recommended by Appendix C and D of Technical Guidelines for Environmental Impact Assessment of Electric power Transmission and Distribution (HJ 24—2020). The results show that when the minimum height to ground of the conductor passing through farmland, garden land, pasture land, livestock and poultry breeding land, roads and other places is 15.5 m, the maximum value of the power frequency electric field intensity under the single cycle parallel line is more than 10 kV/m, the minimum height to ground of the conductor needs to be elevated to 16.5 m to satisfy the limit requirement of 4 kV/m. The power frequency magnetic field generated by the 750 kV single cycle parallel transmission line is less than the public exposure control limit(100 μT), which generally will not be an environmental constraint for the construction of the line, however, the power frequency electric field generated by the line is the main factor of the electromagnetic environmental impact, and the control limit of the power frequency electric field strength(4 kV/m) is an environmental constraint for the construction of the line, and it is also a key control factor for the electromagnetic environment of the transmission and transformation power. The field measurement results and the theoretical prediction results are in good conformity, indicating that the prediction model used has good applicability, and the results of the study can provide technical support for the construction and environmental supervision of 750 kV single cycle parallel transmission lines.

power frequency electric field  /  power frequency magnetic field  /  electromagnetic radiation environment  /  single cycle parallel line  /  transmission line