High voltage (HV) and extra high voltage (EHV) cable systems are fundamental components of electric power transmission networks. Two basically different insulation technologies are characterising the practical implementation, i.e. the traditional fluid filled lapped paper insulation and the dry extruded synthetic insu- lation. Paper insulated cables with mass or oil impregna- tion are still representing the majority of installed HV and EHV underground and submarine cable systems, though in some countries extruded cables have already exceeded the paper insulated ones. After decades of highly satisfactory service performance their basic designs must be considered mature and not many efforts are spent for further developments any more. Extruded cables for all voltage levels of AC and partly also for DC are increasingly dominating new installa- tions. There is significant service experience with AC XLPE land cable systems up to 170 and 225 kV, but less with the higher rated voltages up to 500 kV. Though numerous extruded cables have demon- strated in service for many years their excellent techni- cal and functional level, further developments and improvements are still going on. The reasons are pre- dominantly economical and ecological rather than tech- nical. Submarine cables, previously preferably paper insu- lated, are increasingly equipped, too, with synthetic insu- lation for both AC and DC. The trend goes towards higher transmission voltages and capacities, longer shipping lengths and better performance, i.e. higher availability through improved laying and protection methods. New transmission media like Gas Insulated Lines (GIL) and High Temperature Superconducting Cables (HTS) could be options for future bulk power transmis- sion. However, their actual commercial application is still minimal. The CIGRE Study Committee on Power Cables has accompanied the worldwide cable evolution for almost 80 years. The first committee was founded in 1927 under the designation SC 2. In 1967 it continued as SC 21 and eventually became SC B1 in 2002 as one of the five (B) study committees dealing with subsystems. Its field of activity is the development and operation of “all Types of AC and DC insulated Cable Systems for Land and Submarine Power Transmission”. SC B1’s scope of work covers “Theory, design, man- ufacture, testing, installation, application, operation, main- tenance and diagnostic techniques of (high voltage) power cables”. It is one of the SC’s primary ambitions to effectively participate in and contribute to the progress of world- wide cable systems technologies. SC B1 strives to be an appreciated and recognised forum for international experts and engineers for the exchange of information and knowledge and to add value to these inputs by syn- thesizing them in high quality documents for the ben- efit of the international cable community. Through many years SC B1(21) has produced a com- prehensive library of sophisticated technical documents, preferably Technical Brochures(TB) *), which are addressing all sections of a cable system’s life. The figure shows the four major phases of a cable’s life design, con- State, trends and evolutions of HV/EHV power cables systems and contributions of SC B1 to their ongoing progress SCB1 STUDY COMMITTEE REPORT N° 229 - Décembre 2006 22 Reinhard SCHROTH, Chairman of SC B1 2002 - 2006 *) Lists can be found on www .cig r e.o rg or on www .cig r e-b1.o rg 0611-048-Mep229 12/12/06 6:44 Page 22
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High voltage (HV) and extra high voltage (EHV)
cable systems are fundamental components of electric
power transmission networks. Two basically different
insulation technologies are characterising the practical
implementation, i.e. the traditional fluid filled lapped
paper insulation and the dry extruded synthetic insu-
lation.
Paper insulated cables with mass or oil impregna-
tion are still representing the majority of installed HV
and EHV underground and submarine cable systems,
though in some countries extruded cables have already
exceeded the paper insulated ones. After decades of
highly satisfactory service performance their basic designs
must be considered mature and not many efforts are
spent for further developments any more.
Extruded cables for all voltage levels of AC and partly
also for DC are increasingly dominating new installa-
tions. There is significant service experience with AC
XLPE land cable systems up to 170 and 225 kV, but less
with the higher rated voltages up to 500 kV.
Though numerous extruded cables have demon-
strated in service for many years their excellent techni-
cal and functional level, further developments and
improvements are still going on. The reasons are pre-
dominantly economical and ecological rather than tech-
nical.
Submarine cables, previously preferably paper insu-
lated, are increasingly equipped, too, with synthetic insu-
lation for both AC and DC. The trend goes towards higher
transmission voltages and capacities, longer shipping
lengths and better performance, i.e. higher availability
through improved laying and protection methods.
New transmission media like Gas Insulated Lines
(GIL) and High Temperature Superconducting Cables
(HTS) could be options for future bulk power transmis-
sion. However, their actual commercial application is still
minimal.
The CIGRE Study Committee on Power Cables has
accompanied the worldwide cable evolution for almost
80 years. The first committee was founded in 1927 under
the designation SC 2. In 1967 it continued as SC 21 and
eventually became SC B1 in 2002 as one of the five (B)
study committees dealing with subsystems.
Its field of activity is the development and operation
of “all Types of AC and DC insulated Cable Systems for
Land and Submarine Power Transmission”.
SC B1’s scope of work covers “Theory, design, man-