Optimizing Grounding System Design and Loss Reduction Measures Analysis for Submarine Cable Landing Section

The effective design of the grounding system and the implementation of measures to reduce losses are critical factors in ensuring the safe and stable operation of the submarine cable landing section. This paper focuses on constructing a precise node admittance matrix for the landing section of submarine cables, employing transmission line theory considering various laying methods and section lengths between minor segments. Subsequently, a precise method for solving induced voltage and circulating current is derived. Additionally, the equation for submarine cable loss is developed. Introducing series impedance in a cross-bonded joint proves to be a successful strategy for reducing submarine cable losses. Findings indicate that employing varying lengths between minor sections can result in significantly higher power losses. Coordinating the amplitude and phase angle of the series impedance inserted at the cross-bonded joint contributes to minimizing power losses in the landing section of the submarine cable. Furthermore, the maximum sheath induced voltage before and after changing the laying method, series impedance and deviation does not exceed the upper limit specified by national regulations, which is 100 V. This research contributes to the optimal design of submarine cable grounding systems and loss reduction measures.