Frequency and Time Domain Responses of Cross-Bonded Cables

Summary form only given. Cross-bonded cable models are compared against their versions with normal-bonding (no-bonding) for propagation characteristics, frequency and time domain responses. Contrary to no-bonding cables, coaxial modes cannot propagate in cross-bonded cables. Instead, inter-core modes propagate, being always accompanied by inter-sheath modes. The latter property cannot be observed if a cross-bonded cable is modeled with its homogeneous equivalent. It is shown that sheath cross-bonding induces inter-sheath modes circulating between grounding points and impacts on the cable response at resonant frequencies. Alternate models for cross-bonded cables, including both homogeneous and non-homogeneous equivalents, are compared based on frequency and time domain responses, including a field test on a 225 kV 64 km cable with 17 major sections.