Lars Buhrkall Freelance Electrical Engineer Electrical Drives, Traction Systems, and Electromagnetic Compatibility |
|
ReferencesThis section provides short descriptions of my major activities since 1995, in approximately correct historical order. Click on the small pictures at the top of the page. The comments to each project are found below the big pictures. A more formal CV can be downloaded here.
DSB EMU class IR4 compatibility problem. EMC work, Øresundsbron Compatibility Study, Gardermoen Airport Express trains Compatibility Study, EMUs for QR EMC Safety Case, Class 357 and 375 "Electrostar" EMU for UK CFL locomotive class 3000 compatibility problem DB locomotives class BR185 and BR189 acceptance tests Ice on the overhead line, ESC UserGroup Trolley busses, Landskrona Municipal EMC Safety Case, new Metro vehicles for London Underground Oslo Metro Hector Rail - a new Swedish freight operator BR185 Compatibility Tests in Denmark Hector Rail BR441 Compatibility Tests Vectus people-mover test track, Uppsala, Sweden Winter test, Siemens 'Vectron' loco, Sweden 2012 When first introduced in the mid nineties, the 25 kV 50 Hz class IR4 EMU's were incompatible with the already existing class EA3000 electric locomotives in Denmark. I was the technical project manager of the joint ABB-DSB team that was formed in order to come up with a technically feasible and politically and economically acceptable solution. As a member of the project team for the railway part of the fixed link across Øresund between Denmark and Sweden, I did major parts of the EMC coordination throughout the project. This work also included the specification and documentation of a final test that demonstrated compatibility between the railway and the various systems such as the ILS landing guidance at Copenhagen Airport. I was the project manager of the joint ABB-NSB-Gardermoen team that was formed in order to make sure that the Gardermoen Airport Express trains would be compatible with already existing railway systems (both infrastructure and other trains and locomotives) as well as the new systems at and around the Gardermoen railway. An earlier generation of EMUs had caused problems related to line interference at Queensland Railways. Before introducing the next generation of vehicles, QR requested a compatibility study to be carried out in order to make sure that similar problems would not occur again. I have assisted Adtranz (now Bombardier) with the EMC Safety Case throughout the Electrostar project, from the initial design considerations to the final acceptance tests in Cerhenice in the Czeck Republic. When introduced in Luxembourg in the late nineties, the class 3000 locomotive caused various problems related to line interference. I made an initial theoretical study of the problem, and later on I specified the tests, analysed the recordings and wrote the reports from the measurements that were carried out both before and after modifying the locomotive. Deutsche Bahn has been running an extensive program in order to get an approval from the railway authorities in countries all over Europe for the multi-system freight locomotives class BR185 and BR189. I have been responsible for planning, executing and documenting EMC and signal interference tests with the BR185 in Denmark and Luxembourg, and for similar tests as well as climatic tests at winter conditions with both locomotives in Sweden and Norway. The picture was taken by Dietmar Aurich in Gällivare in northern Sweden, January 2003. On the ESC UserGroup conference in Paris 2002-02-05, it was decided to form a small working group with representatives from SBB, Banverket, Bombardier, Siemens, and other parties that were interested in the problems caused by ice or frost on the overhead supply line of AC electrified railways. I coordinated the working group through a number of meetings, collecting all available information about the problem. A part of this information is available for download elsewhere on the website. The ESC UserGroup is a partly EU-funded cooperation between several parties in the railway community (industry, operators, authorities, consultants, and universities), dealing with all aspects of electrical railway system compatibility. The city of Landskrona in southern Sweden runs a small trolley bus line. During the first winter of operation, the traffic was severely disturbed whenever ice or frost was present on the overhead wires. I carried out a small study and proposed some modifications that have solved the problem. I am currently assisting Bombardier with the EMC Safety Case for the Victoria Line and SSL projects for London Underground. Having started with the initial design we all hope to get a successful case. As a part of a refurbishment program, Oslo Metro replaced the rotating auxiliary converters on a series of old metro cars by static IGBT converters. Due to a serious design flaw, these converters caused stopping failures on a regular basis. I specified the test program, analysed the recorded data, and wrote the test report from the tests that were carried out in order to document the cause of the problem. Hector Rail is a newcomer in the Swedish freight market. Having already bought a series of former Norwegian El 15 locomotives, Hector Rail develops their business even further by means of a series of former Austrian locomotives, ÖBB class Rh 1012 and Rh 1142. I specified, performed, and documented the tests that were carried out in order to assess these locomotives against Banverket's electrical compatibility requirements. Here, we meet a Regina in Hallsberg. The EG3100 is currently the only electric dual-system locomotive that is equipped with the Danish ATC system, meaning that it can run cross-border freight trains from Sweden through Denmark to Germany. After the compatibility tests in January and February 2006, however, the BR185 can at least run in Padborg Station just north of the Danish-German border. Here is a shot with two BR185s of 1st and 2nd generation being tested with an EA3000. Hector Rail has also bought two BR189 locomotives, or BR441 as they will be called in Sweden. I organised and performed the electrical compatibility tests in March 2006. Here, the BR441 is seen in Hallsberg with other Hector Rail locomotives of Norwegian and Austrian origin. The Korean company Vectus is building a prototype people-mover system (a "track-taxi") in Uppsala, Sweden. Small cars for 4 passengers are automatically routed to the desired destination. The cars are propelled by linear induction motors mounted in the track. I have assisted in the electrical system design, EMC work, and development tests I kind of started a new trend - but the Vectron is a cool loco, true biker style :-)
DSB EMU class IR4 compatibility problem. When first introduced in the mid nineties, the 25 kV 50 Hz class IR4 EMU's were incompatible with the already existing class EA3000 electric locomotives in Denmark. I was the technical project manager of the joint ABB-DSB team that was formed in order to come up with a technically feasible and politically and economically acceptable solution. |
Please feel free to send an e-mail to
lars@buhrkall.dk with comments
or questions to this website.
|