Optimizing the Locations of Cables for Current Rating

Presented by Wael Moutassem

Supervisors: Reza Iravani, George Anders

Outline

• What is current rating of a cable?

• Cables in duct bank and casing

• Algorithm: Vector-Immune-System (VIS)

• Optimization results

Cable Current Rating

• Current rating: maximum current carried by cable without overheating, caused by Joule and dielectric losses.

• Losses in conductor, sheath and armour.

• Dissipation of heat outwards through layers to surroundings

• Neighbouring cables affect Joule losses and cause added heat.

• Electro-thermal model including all cables in an installation

Equations for current ratings of cables based on their parameters and configuration

Cables in Duct Bank or Casing

Vector Immune System Algorithm

• Use VIS algorithm to determine configurations for largest and smallest current ratings.

VIS Operations

• Mutation: exchange

• Mutation: inversion

Optimization Results- Duct bank

Largest Total

5,703 AmperesSmallest Total

3,438 Amperes

Difference = 2,265 Amperes

Optimization Results- Casing

Largest Total

2,850 AmperesSmallest Total

2,766 Amperes

Difference = 84 Amperes

Conclusion

• Genetic algorithm used to determine best and worst case configurations.

• Duct bank study shows the large difference in possible total current rating

• Casing study shows effect on current rating of cables proximity to steel casing

Thank You

Questions?

wael.moutassem@utoronto.ca