Comparison of Methods for Suppressing Circulating Current in Metal Sheath of Cables Connected in Parallel

Rui Wu, Weilin Zou, Jie Yuan (), Hua Bao, Shuaijie Wang, Yufeng Liu and Wentao Yang
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Rui Wu: Anhui Electric Power Design Institute Co., Ltd., China Energy Engineering Group, Hefei 230601, China
Weilin Zou: Anhui Electric Power Design Institute Co., Ltd., China Energy Engineering Group, Hefei 230601, China
Jie Yuan: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Hua Bao: Anhui Electric Power Design Institute Co., Ltd., China Energy Engineering Group, Hefei 230601, China
Shuaijie Wang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yufeng Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Wentao Yang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Energies, 2023, vol. 16, issue 11, 1-16

Abstract: The number of high-voltage parallel cables is rapidly increasing. The alternating magnetic field generated by the working current of power cable cores induces voltage in the adjacent metal sheath; if the sheath and earth form a circuit, the metal sheath will create a circulating current, resulting in a reduction in the load capacity of power cable and the life of cable insulation. This paper uses MATLAB to construct a model for calculating the circulating current of cables connected in parallel in the same phase, and the effects of cable arrangement, phase sequence, and loop distance of cables connected in parallel on the sheath circulating current are investigated. The induced voltage in power cable sheaths is decomposed into two components, i.e., the component resulting from the core current and the component resulting from the metal sheath. Two new sheath connection methods are proposed to suppress the sheath circulating current. Compared with traditional cross-connection grounding, the proposed methods can reduce the coupling degree between loops, thus decreasing the induced voltage and circulating current. The different grounding methods of the sheath are modeled in the environment of an electromagnetic transient program (EMTP), and the sheath circulating current is simulated and compared with the conventional cross-connection grounding method. In the asymmetric arrangement, the proposed series connection method can reduce the sheath circulating current by at least 50%; however, its increases the sheath circulating current in the symmetric arrangement.

Keywords: high-voltage power cable; electromagnetic coupling; circulating current; metal sheath; grounding method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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