Numerical electromagnetic analysis of a junction tower with cable arrangements

• Junction towers are the interface between overhead lines and underground cables.
• Eddy current losses in tower steels can be reduced by an appropriate cable arrangement.
• Losses and magnetic fields can be reduced without new facilities.
• The results are useful for designing power junction towers.

Electric energy is an indispensable resource in daily life, but the safety-related problems associated with it remain a general concern, such as unhealthful electric shocks and magnetic fields. Therefore, many scholars are dedicated to research on electric energy, particularly on overhead lines and underground cables. This paper analyzes a junction tower, the interface between overhead lines and underground cables. The analysis reveals that the optimal arrangement of cables noticeably reduces losses in tower steels and the magnetic field around a junction tower without any new facilities. The results are useful for designing power transmission systems.

Junction towers are the interface between overhead lines and underground cables, as shown in the left figure. In a three-phase double circuits system, the cable arrangements with inverted image configurations, shown as the right figure, do not only reduce most eddy current losses in steels but obtains the least magnetic flux density. Thus, this arrangement can effectively reduce the magnetic field and eddy current losses in steels. The results are useful for designing power junction towers.Figure optionsDownload as PowerPoint slide