Availability analysis in a cable transmission system with repair restrictions

Single-system generating capacity adequacy analysis normally does not include recognition of transmission constraints or availabilities. These considerations are usually included in multiarea adequacy studies and in single system studies involving remote generating facilities connected to the system through either high-voltage AC or DC transmission. The availability of the transmission link can be critical to the overall system adequacy and to the benefit associated with the remote generation facility. The authors present a technique for modelling a transmission facility with repair restrictions. The example chosen is an underwater direct-current cable installation. The system is analyzed using a Markov model, and results are presented on time-dependent and steady-state unavailability, as well as on the common mode failure of trenches.<>