Unformatted text preview: Course Ampacity.
The course has been developed for net designers and engineers who have to answer the
following question, “which cable diameter do I need for which capacity?" The course is also
for network administrators and people concerned with the everyday operation who wonder
whether their cable is not going to be overloaded and, finally, for Asset Managers who wish
to know when they have to increase the capacity.
The explanation of the course given below will show you what you can expect from the
The short-term current bearing capacity of a cable is often surprisingly good, but it may be
extremely poor in the long-term or locally (hotspots). The objective of the course is to give
insight into this and to teach the participants the methodology for determining the current
bearing capacity as accurately as possible. Furthermore, it will also be indicated whether a
methodology must be used and when it can best be used.
The course is intended for people with at least a bachelor degree. Knowledge of power
cables is essential. The KEMA “Power Cables” course is a good preparation, although it is
not necessary to have followed that course before following this one.
The course is given in English and the coursework is also in English.
Standards and guidelines
A short summary will be given of the applicable standards: IEC 60287, 60853 and 60055-2
(draft). We will also deal with the practical guidelines of NPR 3626 and the Dutch
pre-standard NVM 3603 cables with integrated glass fibre, which are in common use in the
Even with a stationary approach, the calculation of the current bearing capacity of a cable is
very complex. There are a number of software packages available for this, such as KABER
and Cymcap, which can be used to solve many common thermal problems. The field of use
of this stationary approach and the (im)possibilities of the existing software packages will be
dealt with. Dynamic approach
We all know that everything changes in time. The current bearing capacity of cables normally
has a day/night pattern and a seasonal pattern. Incidents such as a fault, switching and
weather extremes can also occur, but the cable’s surroundings can also change, such as
(new) intersections with other infrastructure or the level of the groundwater.
If you wish to know the true current bearing capacity of a cable and even wish to predict what
it will be in the near future (a couple of weeks in advance), then a dynamic approach is
essential. With this approach, it is easy to monitor the future current bearing capacity.
Influence of the surroundings
In this chapter, we deal in detail with the influence that the surroundings have on the current
bearing capacity of cables. A number of factors have already been stated in the previous
chapters, but there are also other factors. You can influence some of them yourself.
The current bearing capacity in relation to the remaining lifespan and magnetic fields
Everybody has heard of Murphy’s law. What are the consequences for the remaining lifespan
of a cable at a higher load? Are there still any advantages? These and other related
questions will be dealt with in this chapter.
The location of cables plays, together with the current load, an important role in determining
the strength of the accompanying magnetic field. Both factors also have a clear relationship
with the current load capacity. We will deal with this in detail.
Demo set-up and practical exercises
In order to ensure that the participants get a feeling for the many variables, which play a role
in the load capacity of cables, there is time available to carry out a number of exercises, to
simulate a number of what-if situations and to make a number of simple calculations with the
aid of one or more models.
A textbook, PowerPoint presentations and videos are used during the course.
Course date and location
The course will take place at the Congress Centre Elektrum, Klingelbeekseweg 45 in
Arnhem, the Netherlands on September 20, 2007 from 9.00 a.m. to 6.30 p.m., followed by a
The exact programme will be sent to you with confirmation of your enrolment. Costs
Participation in the course costs EUR 990,-- per person. You can use the enclosed
enrolment form to enrol in the course. The minimum number of participants is 10 and the
maximum number is 22. Places will be allocated according to the date on which the
application is received. You can cancel your application before August 15, 2007 at no cost.
Cancellation received after August 15, 2007 is subject to 100 Euro administration fee. After
September 1, 2007 you will be liable to pay the full price of the course.
The course may be cancelled if there are too few participants. You will be informed as to
whether the course will be held on August 15. The cost of the course includes the textbook,
coffee, tea, and soft drinks during the day, lunch and dinner. Travel costs and
accommodation costs are not included. The price excludes VAT.
You will have to pay your own hotel costs. After you have enrolled, KEMA will send you an
invoice for the cost of the course.
Ms Tonie Hoegen
T +31 26 3 56 22 85
F +31 26 4 46 17 26
E [email protected]
E [email protected] (for technical information)
If you would like us to make a hotel reservation for you, then please state this on the
enrolment form. The hotel costs needs to be paid directly at the hotel.
KEMA’s mission is very clear and focussed: we wish to help the energy markets throughout
the world obtain and sustain tangible advantages over the competition and achieve a high
return on investments in technology. We achieve our mission with the help of an integrated
team of material experts who, with their innovative ideas and in-depth knowledge of our
clients’ industrial sectors - but also of the technology, which can act as a driving force for
further development - continually realize remarkable results for our clients.
In the field of Cable Technology, KEMA worldwide supplies technical consultancy advises for
industry, governments and energy companies on matters concerning cables. ...
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- Spring '10
- Magnetic Field, power cable, KEMA, KEMA Academy, current bearing capacity