Abstract
In recent years, more and more electric utilities are using underground cables to distribute electric power rather than overhead transmission line. However, the cost of installation and maintenance of underground cables is very expensive. Thus, the proper design and damage prediction of cables are crucial. This paper is focused on the magnetic force waveforms simulation of cables under different types of faults using PSCAD and COMSOL. The results show that three-phase fault leads to the largest magnetic forces and the maximum magnitude of the forces in the x-direction is about 2.5 N. Also, the magnetic fields surrounding the cables are different depending on the arrangements of cables buried method. Although the magnitude is small, considering the long distance and long operating time of underground cables, the forces between cables can cause failures under some conditions. In the future, more types of faults such as high impedance fault and different protecting technologies can be studied.
Highlights
Underground cables provide more convenience than overhead transmission lines since they are deeply buried underground
The results show that three-phase fault leads to the largest magnetic forces and the maximum magnitude of the forces in the x-direction is about 2.5 N
The magnetic fields surrounding the cables are different depending on the arrangements of cables buried method
Summary
Underground cables provide more convenience than overhead transmission lines since they are deeply buried underground. To predict the damage of switching and different faults on cables, it is important to simulate and analyze the magnetic forces of cables under different system conditions. Several published papers have studied underground cables [1]-[6], but they. Few papers are focused on the magnetic field simulation [7] [8] [9]. No paper is simulating the magnetic forces during capacitor switching and different types of faults. The objective of this paper is to simulate and analyze the forces waveforms of cables during different situations such as capacitor switching and faults. The current data of cables during capacitor switching and different types of faults are achieved using PSCAD; and the related magnetic forces on cables are calculated and simulated using COMSOL
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