Submarine Coaxial Cable Pressure Characteristics

In equalization design of submarine coaxial cable system, the cable attenuation deviation due to pressure in deep sea bottom has significant weight. This paper treats the submarine coaxial cable characteristics pressure dependency. By using an artificial ocean test facility, 1.7 inch submarine coaxial cable attenuation, phase, capacitance and insulator core diameter were studied and their pressure coefficients under a pressure of 0 to 500 at temperatures of 5, 10 and 20°C were obtained. In this study, pressure dependence of polyethylene dielectric constant and dissipation loss were quantitatively analyzed. The attenuation pressure coefficient varies with frequency. For example, cable attenuation in the sea at a depth of 5000 meters is higher than that on the land by 1.09 percent at 10 MHz and by 1.54 percent at 60 MHz at a temperature of 10°C.