BCC AS YOUR PROJECT PARTNER
With a relevant number of more than 110 national and international projects, we are your first adress when it comes to complex cable questions. Just to present a little excerpt of these projects and to give you a first impression about BCC's problem-solving skills, you find short-descriptions of three complete different projects at the bottom.
Self-shielding HV cables
Extreme requirements for a limitation of the magnetic field near to cables may lead to the necessity of a ferromagnetic enclosure, which is disadvantageous under aspects of losses, trenching and cost, as well.
Following a proposal of BCC, a new cable type was developed by the cable manufacturer nkt cables, Cologne: the IES-cable (cable with Integrated Electromagnetic Shielding).
The new shielding approach is to integrate the electromagnetic shielding into the cable design. The complexity of this shielding measure for three-core HV cables is limited. Steel pipes, concrete fillings etc. can be saved, and the additional losses are significantly lower as compared with other techniques. The gained shielding factors are extremely high.
The worldwide first installation of a 150-kV-IES-cable (3x500mm2 RM Cu Valfit cable, 200 MVA) was made by the TSO Liandon in Amsterdam. Measurements were taken and compared to numerical calculations by BCC. Both match well, and the favourable shielding effect could be confirmed.
Riniken / Switzerland
An intermediate section of less than 1.5 km length of a 40 km 380-kV-OHL route was waiting for a final court decision since 20 years. Objections of the residents raised the question of a 380-kV-cabling in this section. Studies of the TSO and informations of the local cable producer said “not senseful, too difficult, too expensive”.
Three studies of BCC, regarding the possibilities of an optimized layout with respect to all the thermal, mechanical, constructional, operational and electro-magnetic problems, taking into account modern 380-kV-cables as well as new installation techniques led to the final decision of the Swiss Bundesgericht.
At the moment, the TSO is successfully finishing the planning and admission phase, supported by BCC, and ready to begin the installation measures.
Hot-Spot in a 380-kV-cable trench with district heating pipes
The design of a 380-kV-cable route was complicated by sections of grouping with some 110-kV-cables and – as an especially severe thermal impact – with two district heating pipes.
The thermal problem was solved by the combination of two measures:
1) embedding of the 380-kV-cables in a special concrete with extreme thermal conductivity.
2) inserting a well-dimensioned heat insulation plate in between the cables and district heating pipes.
The development of this special concrete by the company HeidelbergCement was initiated and assisted by BCC.
The analysis of the time-dependent thermal behaviour of the cables was executed by BCC by means of a special FEM-program tool, which is well adapted to the nonlinear thermal and electromagnetic problems of cable installations.