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Jicable'15 Tutorials

Tutorial T1:

Impact of EMF on current ratings and cable systems

Harry Orton, Consulting Engineers International, Canada

Tutorial T1 presents guidelines for managing the rating of a HV underground power cable electric system when magnetic field mitigation techniques are added to the system. The addition of any mitigation device may modify the ambient conditions surrounding the cables so examples are provided in the tutorial to give good technical solutions leading to practical installations. Extensive case studies will be discussed. A summary table is provided to assist with the most judicious selection of the shielding method as well as economical evaluation of investment costs. Also the cost of additional losses and maintenance of the mitigation device is discussed.

Tutorial organized in cooperation with the CIGRE Study Committee B1.

Tutorial T2 

Guide for rating calculations of HV cables

Frank H. de Wild, DNV GL, Netherlands

Tutorial T2 is based on very recent CIGRE work which includes the current rating of insulated power cables: directly buried, submarine and in-air installations are considered in detail, addressing problems with establishing the ampacity of both new and existing power cables. In the tutorial, three major topics will be considered:

This tutorial will give the participant the most recent overview of all possibilities and impossibilities, do's and don'ts, solutions and remaining 'gaps' regarding the complete topic of underground power cable current rating.
Tutorial organized in cooperation with the CIGRE Study Committee B1.

Tutorial T3

Guidelines for submarine cable projects

Christian Jensen, Manager Projects, Energinet.dk

Tutorial T3 presents guidelines concerning many aspects of submarine cable projects and in particular for offshore generation. Main topics are offshore surveys for consenting and installation purposes, system design of cable connections, cable design, cable installation, testing, maintenance and dynamic cables for floating generation. Examples are included. The tutorial can be used as an introduction to the subject and a basis for further discussions regarding submarine cable issues.

Tutorial organized in cooperation with the CIGRE Study Committee B1.

Tutorial T4

Issues related to long HVAC cables

Filipe Miguel Faria da Silva, Faculty of Engineering, Aalborg, Denmark* and Ken Barber, Nan Electric Cable, Australia**

The first part of Tutorial T4 describes system technical performance issues related to power systems with long AC cables. The study areas are divided into planning, system impact and equipment design. The presentation includes examples and explanations such phenomena occurring as a result of various system operations, guidelines for simulation, interpretation of the results, possible mitigation measures, recommendations on modeling and results measurements performed on the 100 km long Horns Rev 2 AC cable.

The second part of Tutorial T4 commences with a practical definition of a long length AC cable system and reasons for the recent significant growth in the demand for such systems. Then, it will address the modern developments which have occurred in cable and accessory design as well as installation techniques which have made this possible. The various challenges for practical implementation such as matching ratings, protection systems, controlling EMF, reactive compensation, sheath bonding, directional drilling, rights of way, testing, monitoring and reliability of supply will be addressed. Finally some practical examples of more than 50 long length AC cable systems which have been identified will be discussed to highlight some of these issues.

Tutorial organized in cooperation with the CIGRE Study Committees C4 and B1.

Tutorial T5

Electrical modeling of cables and off-line diagnostic

Minh Nguyen-Tuan* and Thierry Espilit**, Electricité de France, R&D, France

The development and the asset management of underground and submarine links go along an increasing demand for theoretical and experimental studies of the cables behavior. The purpose of this tutorial is to provide elements both in terms of fine electrical modeling, and in terms of measurements for MV off-line diagnostic of cable links.

  1. Electrical modeling of cables*

    In the first part of the tutorial, we will present cable models, which must be carefully chosen to get reliable simulation results.
    The following topics will be addressed:

    • Existing models, for steady-state and transients studies;
    • Cable systems electrical characteristics;
    • Limitations of existing models and areas for improvement.
  2. Off-line diagnostic**

    In the second part, we will present diagnostic measurement methods for MV underground links. These methods have been specifically developed in order to prevent short time failure and to rank types of cable sections for network renewal operations.
    The following topics will be addressed:

    • Methods based on tangent delta and partial discharges measurements;
    • Limitations of currently used criteria;
    • Possibility of adapting the diagnostic operations based on the characteristics of diagnostic systems available
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