I. Project Overview

Overview of Offshore Wind Power Engineering: The electrical power generated by the wind turbines is collected through collector lines (35kV offshore cables) and delivered to the 220kV offshore step-up station's 35kV distribution unit. After being stepped up to 220kV at the offshore step-up station, it is transmitted via a single 220kV offshore cable to the onshore central control center, where it is finally delivered into the system. The integrated cable monitoring system equipment is installed in the communication room of the onshore central control center, and the monitoring backend is set up in the control room of the onshore central control center. The system's monitoring range includes the platform of the offshore step-up station to the landing point, three 220kV submarine optical fiber composite cables, with each optical cable being approximately XXX km in length.  Part Two: Significance of Monitoring

Subsea optical composite cables integrate power and communication transmission functions, widely used in offshore wind power generation, offshore oil platforms, and for transmitting power and information between continents and islands, islands, and across river, lake, and sea beds. As a concealed engineering project, the cables are subject to uneven environmental temperatures due to installation methods and landing conditions. With the increasing ocean development activities, incidents of mechanical damage to the cables from aquaculture, fishing nets, and anchors are not uncommon. Moreover, factors like sea water erosion can degrade the cable's waterproof performance and cause insulation aging, leading to leakage current and increased temperatures at fault points, potentially causing breakdown accidents and significant economic losses, severely impacting the safe operation of the cables. Therefore, continuous temperature monitoring of the entire cable, especially at cable joints and transitions between sea, land, and submarine cables, is crucial for ensuring the cable's healthy operation.