liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Investigation of alternative current measurements in high-voltage applications
Linköping University, Department of Science and Technology.
2007 (English)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesis
Abstract [en]

ABB:s MACH2 system uses a number of currents to ignite thyristors for AC/DC-trassfformation and they are measured for control and protection. The measurement methods used today has major drawbacks. Two alternative techniques are investigated, one based on the Hall-Effect (HED) and the other based on Anisotropic Magnetoreistanse (AMR), both techniques sensing the magnetic field produced by currents in a conductor. The HED hawe low sensitivity so some kind of flux concentrators is needed. This adds volume, costs and complexity to the device. The AMR technique is much more sensitive than the HED. Unfortunately AMR are also much more sensitive for high over currents that may damage the devise, and they are not as common on te market. By testing linearity, step response and frequency dependency for some components, my conclusion is that HED components with toroidal flux concentrators utilizing magnetic feedback (Closed Loop, CL) may be used in this particular application. A drawback with CL are that they, when measuring sharp edged step signals, suffer from overshoots at the output that might activate the over current protection.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap , 2007. , 88 p.
Keyword [en]
HVDC, measure, Hall-Effect, Magnetoreistanse, magnetic field, current
Keyword [sv]
mätning, ström
National Category
Control Engineering
URN: urn:nbn:se:liu:diva-8149ISRN: LITH-ITN-ED-EX--07/001--SEOAI: diva2:23000
2007-01-17, K4503, Kåkenhus, Bredgatan 33, Norrköping, 15:15
Available from: 2007-02-09 Created: 2007-02-09

Open Access in DiVA

fulltext(5262 kB)1505 downloads
File information
File name FULLTEXT01.pdfFile size 5262 kBChecksum SHA-1
Type fulltextMimetype application/pdf

By organisation
Department of Science and Technology
Control Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1505 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 641 hits
ReferencesLink to record
Permanent link

Direct link