Research on Online Monitoring of Submarine Cable Insulation Based on Two-Terminal Current Method

With the construction of submarine cable projects in full swing, the issue of monitoring the status of submarine cables is a popular research topic today. The insulation of submarine cables is a critical structure in submarine cables, so the online monitoring technology of submarine cable insulation is very important. This paper designs and builds an online monitoring system for submarine cable insulation based on the two-terminal current method, and calculates the dielectric loss factor of submarine cable insulation by simultaneously measuring the current and voltage data at both ends of the cable. The results show that the monitoring system can stabilize the monitoring data under different working conditions, and the data error is only 6% under the influence of 90 ns time synchronization error, which can reflect the overall state of the cable insulation well, but cannot reflect the local insulation deterioration of the cable, and only the serious local defects cause a large change in the results.