The feasibility of magnetic field reduction by phase relationship optimization in cable systems

• Published in: IEEE transactions on power delivery Vol. 13; no. 2; pp. 647 - 654
• Main Authors: Karady, G.G., Nunez, C.V., Raghavan, R.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.1998; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Cable shielding; Conductors; Earth; Electrical engineering. Electrical power engineering; Electrical power engineering; Equations; Exact sciences and technology; Grounding; Impedance; Magnetic analysis; Magnetic circuits; Magnetic fields; Power cables; Power networks and lines; Underground and submarine networks; Reduction; Underground cable; Statistical distribution; Computer program; Magnetic field; Optimization; Power transmission line
• ISSN: 0885-8977; 1937-4208
• DOI: 10.1109/61.660956

This paper investigates the feasibility of magnetic fields reduction by optimization of phase relationships in a multi-circuit underground power cable system, carrying unbalanced loads. A novel algorithm was developed for fast calculation of the multi-circuit power cable system-generated magnetic field. The unbalanced load was modeled by random selection of phase current values. A computer code was written to calculate the statistical distribution of the magnetic field above the cables on the ground level. The program calculates the maximum magnetic field for different phase relationships and selects the optimum phase relationship. Several multi-circuit power cable systems used by electric utilities have been analyzed. The results show that the optimization of phase relationships effectively reduces the magnetic field for power cable systems with both single and multi-point grounded sheaths in spite of the load unbalance.