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  • 1.
    Ahlers, Franz Josef
    et al.
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Kuchera, Jan
    Cesky Metrologicky Institut, Czech Republic.
    Poirier, Wilfried
    Laboratoire National de Métrologie et d'Essais, France.
    Jeanneret, Blaise
    Cesky Metrologicky Institut, Czech Republic.
    Strapinski, Alexandre F.
    MIKES Mittatekniikan Keskus, Finland.
    Tzalenchuk, Alexander Ya
    NPL Management, United Kingdom.
    Vrabcek, Peter
    Slovensky Metrologicky Ustav, Slovakia.
    Bergsten, Tobias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Hwang, Changyong
    Korea Research Institute of Standards and Science, South Korea.
    Yakimova, Rositza T.
    Linköping University, Sweden.
    Kubatkin, Sergey E.
    Chalmers University of Technology, Sweden.
    The EMRP project GraphOhm- Towards quantum resistance metrology based on graphene2014Inngår i: CPEM 2014, 2014, , s. 548 - 549s. 548-549, artikkel-id 6898502Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A new joint research project (JRP) integrating metrology institutes and universities from nine countries is aimed at realization of a new generation of standards for quantum resistance metrology. The project exploits graphene's properties to simplify operation of standards without compromising the unprecedented precision delivered by semiconductor quantum Hall devices. Higher operating temperatures (above 4.2 K, and up to 8 K) and together with lower magnetic fields (below 5 T, and potentially down to 2 T) will lead to a significantly improved and cost-saving dissemination of intrinsically referenced resistance standards to all end-users relying on electrical measurements.

  • 2.
    Bahmani, Amin
    et al.
    Chalmers University of Technology, Sweden.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Kharezy, Mohammad
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Design Methodology and Optimization of a Medium Frequency Transformer for High Power DC-DC Applications2015Inngår i: Applied Power Electronics Conference APEC, 2015, , s. 8s. 2532-2539Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The high power medium frequency transformer (HPMFT) is one of the key elements of an isolated, bi-directional DC-DC converters in applications such as future all-DC offshore wind farms, traction and solid state transformers. This paper describes a design methodology taking into account the loss calculation, isolation requirements and thermal management. Incorporating this design methodology, an optimization process with a wide range of parameter variations is applied on a design example to find the highest power density while the efficiency, isolation, thermal and leakage inductance requirements are all met.

    Fulltekst (pdf)
    fulltext
  • 3.
    Bahmani, Amin
    et al.
    Chalmers University of Technology, Sweden.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Kharezy, Mohammad
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Optimization and Experimental Validation of Medium-Frequency High Power Transformers in Solid-State Transformer Applications2016Inngår i: 2016 IEEE Applied Power Electronics Conference and Exposition (APEC), 2016, , s. 8s. 3043-3050Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    High power isolated DC-DC converters are likely to provide solutions for many technical challenges associated with power density, efficiency and reliability in potential applications such as offshore wind farms, inter-connection of DC grids, MVDC in data centers and in future solid state transformer applications. The high power medium frequency transformer (HPMFT) is one of the key elements of such a converter to realize the voltage adaption, isolation requirements, as well as high power density. This paper describes a design and optimization methodology taking into account the loss calculation, isolation requirements and thermal management. Incorporating this design methodology, an optimization process with a wide range of parameter variations is applied on a 50 kW, 1 / 3 kV, 5 kHz transformer to find the highest power density while the efficiency, isolation, thermal and leakage inductance requirements are all met. The optimized transformers are then manufactured and will be presented in this paper.

  • 4.
    Bahmani, Mohammad Amin
    et al.
    Chalmers University of Technology, Sweden.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Kharezy, Mohammad
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Design methodology and optimization of a medium-frequency transformer for high-power DC-DC applications2016Inngår i: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 52, nr 5, s. 4225-4233, artikkel-id 7496932Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The medium-frequency power transformer (MFPT) is one of the key elements of an isolated bi-directional dc-dc converters in applications such as future all-dc offshore wind farms, traction, and solid state transformers. This paper describes a design methodology taking into account loss calculation, isolation requirements, and thermal management. Incorporating this design methodology, an optimization process with a wide range of parameter variations is applied on a design example to find the highest power density while the efficiency, isolation, thermal, and leakage inductance requirements are all met.

  • 5.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Absolute calibration of a 100 kV DC divider.1996Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 6.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Analysis of metrological requirements for electrical measurement of HVDC station losses2012Inngår i: IEEE Transactions on Instrumentation and Measurement, Vol. 61, nr 10, s. 2695-2700Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    23 May 2012

  • 7.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Calibration of high resolution digital recorders for impulse measurements.1998Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 8.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Difference amplifier for use in accurate voltage transformer calibrations.1989Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 9.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    International comparison of measurement of 200 kV DC, Results obtained of SP.2008Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    FULLTEXT01
  • 10.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Publishable JRP2012Rapport (Fagfellevurdert)
  • 11.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Qualification of a reference measuring systems for impulse voltage.1992Rapport (Fagfellevurdert)
  • 12.
    Bergman, Anders
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Elg, Alf Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Hällström, J
    Dedeoglu, S
    Houtzager, E
    lucas, W
    Merev, A
    Weber, C
    Design of a wideband HVDC reference divider2012Inngår i: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , s. 207-208s. 207-208Konferansepaper (Fagfellevurdert)
  • 13.
    Bergman, Anders
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Meisner, Johann
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Svensson, Stefan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet. Physikalisch Technische Bundestanstalt, Germany.
    Enabling DC-Side Metering in HVDC Stations2014Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 29, nr 1, s. 370-377Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    HVDC power transmission is now being considered not only for point-to-point interties, but also as true grids where several operators may tie into the grid, each having its own economic sphere. In this new situation, it is important that transmitted energy be distinguished from losses incurred in the converter stations, to enable a fair distribution of costs for grid operation. To this end, a metrology infrastructure is needed where high-current and high-voltage transducers must be possible to calibrate traceably, and where dc electricity meters can be calibrated and approved. A research project is currently working with these questions in a concerted European research effort, funded by the European Commission. The present publication highlights important aspects of this work.

  • 14.
    Bergsten, Tobias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Disordered Fermi liquid in epitaxial graphene from quantum transport measurements2011Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, nr 16, s. 166602-Artikkel i tidsskrift (Fagfellevurdert)
  • 15.
    Bergsten, Tobias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Gunnarsson, Ove
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A precision current source using Δ-Σ modulation.2011Inngår i: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, nr 7, s. 2341-2346Artikkel i tidsskrift (Fagfellevurdert)
  • 16.
    Bergsten, Tobias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Josephson waveform generation using multilevel Δ-Σ Modulation2012Inngår i: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , s. 172-173s. 172-173, artikkel-id 6250856Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present a novel method of generating an ac voltage using a programmable Josephson voltage standard. The ac voltage is generated by Δ-Σ (Delta-Sigma) modulation of multiple Josephson levels. Compared with an ac voltage generated by stepwise approximation, the Δ-Σ method reduces the low frequency harmonics of the generated signal. We demonstrate this method by generating a 90 Hz sine wave and measuring the spectrum with a digitizer.

  • 17.
    Bergsten, Tobias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Determining voltage dependence of the phase response in voltage dividers2012Inngår i: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , s. 282-283s. 282-283, artikkel-id 6250912Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We have developed methods to characterise voltage dependence of the phase response in voltage dividers. The voltage dependence is a combination of two parts, a linear dependence and a power dependence due to voltage and temperature dependence in capacitors respectively. The standard uncertainty of the phase at 240 V and 100 kHz is estimated to be 20 μrad.

  • 18.
    Börjesson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Simulated loading of vehicle scales.1989Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 19. Cerqueira Bastos, Miguel
    et al.
    Hammarquist, Maria
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A High-Voltage Testbed for the Evaluation of High-Voltage Dividers for Pulsed Applications.2011Inngår i: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, nr 7, s. 2462-2468Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The design, evaluation and commissioning of a high voltage reference testbed for pulsed applications to be used in the precision testing of high voltage dividers is described. The testbed is composed of a pulsed power supply, a reference divider based on compressed gas capacitor technology and an acquisition system which makes use of the fast measurement capabilities of the HP 3458 DVM. Results of the evaluation of the reference system are presented.

  • 20.
    Early, Murray
    et al.
    MSL Measurement Standards Laboratory of New Zealand, New Zealand.
    Christian, Lauri
    MSL Measurement Standards Laboratory of New Zealand, New Zealand.
    Andersson, Bengt-Olof
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Gunnarsson, Ove
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A simple build-up method for the DC voltage scale of a source2012Inngår i: Proc of Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , s. 498-499s. 498-499Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We report on the performance of a simple method, known as the Reference Step Method, to build up the dc voltage scale of a source. The key advantages of this method are that it relies on equipment that is readily available in most high-level laboratories and can be fully automated. The Type A uncertainties achieved by this approach can be less than 0.1 μV/V. This performance is achieved because of the excellent differential linearity of the DMM used in the method. We are validating the accuracy of the method by directly comparing this approach with more traditional resistive divider techniques.

  • 21.
    Early, Murray
    et al.
    MSL Measurement Standards Laboratory of New Zealand, New Zealand.
    Sira, Martin
    Czech Metrology Institute, Czech Republic.
    Christian, Laurie
    MSL Measurement Standards Laboratory of New Zealand, New Zealand.
    Andersson, Bengt-Olof
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Gunnarsson, Ove
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Streit, Jirí
    Czech Metrology Institute, Czech Republic.
    A Simple Build-Up Method for the DC Voltage Scale of Source2013Inngår i: IEEE Transactions on Instrumentation and Measurement, Vol. 62, nr 6, s. 1600-1607Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report on the performance of a simple method, known as the reference step method, to build up the dc voltage scale of a source. The key advantages of this method are that it relies on equipment that is readily available in most high-level laboratories and can be fully automated. The Type A uncertainties achieved by this approach can be less than 0.1 μV/V. This performance is achieved because of the excellent differential linearity of the DVM used in the method. We have validated the overall accuracy of the method by directly comparing this approach with more traditional resistive divider techniques and have established that the expanded uncertainty is better than 0.2 μV/V up to 1000 V, limited only by the performance of the instruments used.

  • 22.
    Eklund, Gunnar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Realisering av induktansenheten.1992Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 23.
    Eklund, Gunnar
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Bergsten, Tobias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Determination of transition error corrections for low frequency stepwise-approximated Josephson sine waves.2011Inngår i: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, nr 7, s. 2399-2403Artikkel i tidsskrift (Fagfellevurdert)
  • 24.
    Eklund, Gunnar
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Bergsten, Tobias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Low frequency characterization of a planar multijunction thermal converter using a programmable Josephson voltage standard2012Inngår i: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , s. 62-63s. 62-63, artikkel-id 6250661Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We describe high accuracy low-frequency ac-dc transfer determinations performed with a programmable Josephson voltage standard. The ac-dc difference characteristic of a planar multijunction thermal converter is determined indirectly by comparison via a high input impedance thermal transfer standard at 0.8 V in the frequency range 10 Hz to 110 Hz. 

  • 25.
    Eklund, Gunnar
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Gunnarsson, Ove
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    EUROMET.EM-S18 supplementary comparison of 1 ohm and 10 kohm resistance standards2005Inngår i: Metrologia: Technical Supplement 1A (01009), Vol. 42Artikkel i tidsskrift (Annet vitenskapelig)
  • 26.
    Eklund, Gunnar
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Pajander, Hannu
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    The SP Josephson array voltage standard.1995Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 27.
    Gradinarsky, LP
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Johansson, J
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Climate monitoring using GPS2002Inngår i: Physics and chemistry of the earth, Vol. 27Artikkel i tidsskrift (Annet vitenskapelig)
  • 28.
    Gradinarsky, LP
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Johansson, Jan et al
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    GPS site testing at Chajantor in Chile2001Inngår i: Physics and chemistry of the earth, Vol. 26, s. 421-426Artikkel i tidsskrift (Annet vitenskapelig)
  • 29.
    Gunnarsson, Ove
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Calibration of PD-calibrators.1998Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 30.
    Gunnarsson, Ove et al
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Comparison EUROMET.EM-K8 of DC voltage ratio: results2005Inngår i: IEEE Transactions on Microwave Theory and Techniques, Vol. 54, s. 575-579Artikkel i tidsskrift (Fagfellevurdert)
  • 31.
    Gunnarsson, Ove et al
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Transport behavior of commercially available 100?W standard resistorsol.2001Inngår i: IEEE transactions on instrumentation and measurement, Vol. 50, s. 242-244Artikkel i tidsskrift (Annet vitenskapelig)
  • 32.
    Gunnarsson, Ove
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Nilsson, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Thorén, Ingemar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Den svenska resistansenheten, resultatet av en internationell jämförelsemätning 1990/91.1991Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 33.
    Houtzager, Ernest
    et al.
    VSL Dutch Metrology Institute, The Netherlands.
    Rietveld, Gert
    VSL Dutch Metrology Institute, The Netherlands.
    Hällström, Jari K.
    MIKES, Finland.
    Elg, Alf Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    van der Beek, Jan H.N.
    VSL Dutch Metrology Institute, The Netherlands.
    Selection and characterization of resistors for a HVDC reference divider2012Inngår i: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , s. 197-198s. 197-198, artikkel-id 6250869Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper describes the selection and characterization of resistors for a 1000 kV HVDC divider. One thousand 10 MΩ resistors will be connected in series in the final design. Due to the large number of resistors only a randomly selected set has been characterized. The measured temperature and voltage coefficients of the resistors are around 1 μΩ/Ω/K and -10 μΩ/Ω/kV respectively, which make them very suitable for reaching the overall desired divider uncertainty of better than 100 μV/V.

  • 34.
    Hällström, Jari K.
    et al.
    MIKES, Finland.
    Svensson, Stefan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Suomalainen, Esa Pekka
    MIKES, Finland.
    Immonen, Pekka
    MIKES, Finland.
    Bilateral three-phase 50 Hz power comparison2012Inngår i: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , s. 118-119s. 118-119, artikkel-id 6250689Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper describes the results of a bilateral three-phase power comparison between SP, Sweden and MIKES, Finland. A three-phase precision electricity meter was used a transfer reference. Both active and reactive three-phase power measurements were compared.

  • 35.
    Ivarsson, Sven
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Johansson, Bengt
    Källgren, Håkan
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Calibration of submultiples of the kilogram.1989Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    FULLTEXT01
  • 36.
    Ivarsson, Sven
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Johansson, Bengt
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Intercomparison of measurement techniques on small masses. Euromet project A88/143.1989Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 37.
    Jarlemark, P
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Johansson, J
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Real time GPS procesing for regional atmmospheric delay derivation2002Inngår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 29, nr 16Artikkel i tidsskrift (Annet vitenskapelig)
  • 38.
    Jarlemark, P
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Johansson, Jan et al
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Spatial error correlation of GPS atmospheres as determined from simulations,2001Inngår i: Physics and chemistry of the earth, Vol. 26, s. 451-456Artikkel i tidsskrift (Annet vitenskapelig)
  • 39.
    Johansson, Bengt
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    11th comparison between the Swedish national kilogram and SP principal standards for one kilogram.1996Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 40.
    Johansson, J
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Continuous GPS measurement of postglacial adjustment in Fennoscandia, 1.2002Inngår i: Journal of geophysical research, Vol. 107Artikkel i tidsskrift (Annet vitenskapelig)
  • 41.
    Joons, Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Uppbyggnad, idrifttagning och verifiering av ett nollfödesmätsystem för likströmsmätning 40-3500A2002Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 42.
    Juvik, Jon Ivar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A calibration system for instrument transformers with digital output.2001Rapport (Fagfellevurdert)
  • 43.
    Juvik, Jon Ivar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A calibration system for instrument transformers with digital output2001Rapport (Fagfellevurdert)
  • 44.
    Juvik, Jon Ivar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    On-site long term comparison between instrument transformers with digital ouput and a conventional measuring system2001Konferansepaper (Annet vitenskapelig)
  • 45.
    Kharezy, Mohammad
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Reliability study of monitoring systems for power transformers in the smart grid2015Rapport (Fagfellevurdert)
    Abstract [en]

    The project suggests appropriate methods for quality assurance of measurement processes and measuring equipment used for condition monitoring of power transformers, specifically for selection of on-line monitoring systems for: • Temperature • Partial discharge (PD) • Sound and vibration The developed methods can be developed further in subsequent projects to cover the quality of other types of measurement processes and measuring equipment as part of maintenance planning activities.

    Fulltekst (pdf)
    fulltext
  • 46.
    Kharezy, Mohammad
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Lindgren, Mikael
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Fiberoptic sensors for high-voltage applications1981Rapport (Fagfellevurdert)
    Abstract [en]

    SP has experience in the field of fiberoptic communication and expertise in research in the field. Also, SP has expertise in the high-voltage field and there is currently a large interest in developing the high-voltage network in order to accommodate new small producers of electric power (wind mills, solar power, etc.) In this report we describe efforts to find areas of interest to develop fiberoptic sensors for offshore monitoring of high-voltage equipment. A large number of research papers and review articles have been collected and reviewed in order to investigate what possibilities are at hand for SP to provide support for development of new or existing fiberoptic sensor technologies.

    Fulltekst (pdf)
    FULLTEXT01
  • 47.
    Klüss, Joni
    et al.
    Aalto University, Finland.
    Hällström, Jari
    MIKES Centre for Metrology and Accreditation, Finland.
    Elg, Alf Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Optimization of field grading for a 1000 KV wide-band voltage divider2015Inngår i: Journal of Electrostatics, ISSN 0304-3886, E-ISSN 1873-5738, Vol. 73, s. 140-150Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An HVDC reference voltage divider has been designed for high accuracy and wide-band measurements up to 1000 kV. To maintain wide-band characteristics, field distribution must be optimized in order to minimize the response time of the divider. To compensate the stray capacitance, a capacitive path that surrounds the resistive reference divider is added to function as a shield. Optimal capacitance values producing a matched distribution are obtained using 3D FEM simulations. Factors affecting the performance of the divider are assessed by simulating multiple scenarios representing different practical considerations in real-life applications.

  • 48.
    Kohlmann, Johannes
    et al.
    Physikalisch-Technische Bundesanstalt, Germany.
    Behr, Ralf
    Physikalisch-Technische Bundesanstalt, Germany.
    Kieler, Oliver F.O.
    Physikalisch-Technische Bundesanstalt, Germany.
    de Aguilar Rois, J. Diaz
    Centro Espanol de Metrologia, Spain.
    Sira, Martin
    Cesky Metrologicky Institut Brno, Czech Republic.
    Sosso, Andrea
    INRIM Istituto Nazionale di Ricerca Metrologica, Italy.
    Trinchera, Bruno
    INRIM Istituto Nazionale di Ricerca Metrologica, Italy.
    Gran, Jarle
    Justervesenet, Norway.
    Malmbekk, Helge
    Justervesenet, Norway.
    Jeanneret, Blaise
    METAS Federal Institute of Metrology, Switzerland.
    Overney, Frederic
    METAS Federal Institute of Metrology, Switzerland.
    Nissilä, Jaani
    MIKES Mittatekniikan Keskus, Finland.
    Lehtonen, Tapio A.
    MIKES Mittatekniikan Keskus, Finland.
    Ireland, Jane
    NPL Management Limited, United Kingdom.
    Williams, Jonathan M.
    NPL Management Limited, United Kingdom.
    Lapuh, Rado
    Slovenski Institut Za Kakovost in Meroslovje, Slovenia.
    Voljc, Bostjan
    Slovenski Institut Za Kakovost in Meroslovje, Slovenia.
    Bergsten, Tobias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Öztürk, Tezgül Coskun
    TUBITAK, Turkey.
    Houtzager, Ernest
    VSL B.V., The Netherlands.
    Van Den Brom, H. E.
    VSL B.V., The Netherlands.
    Øhlckers, Per Alfred
    Buskerud and Vestfold University College, Norway.
    A quantum standard for sampled electrical measurements-Main goals and first results of the EMRP project Q-WAVE2014Inngår i: 29th Conference on Precision Electromagnetic Measurements, CPEM 2014, 2014, , s. 522-523s. 522-523, artikkel-id 6898489Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Josephson voltage standards are well established for use at dc and low-frequency ac voltages. The increasing demand i) to provide traceability for arbitrary waveforms, ii) to extend the range of use to higher frequencies, and iii) to improve the accuracy is being addressed in the project Q-WAVE, which is jointly funded by the European Union and the participating countries within the European Metrology Research Programme (EMRP). Here, sampling measurements and procedures using binary-divided 1 V and 10 V arrays are investigated. In addition, a quantum-based analogue-to-digital converter for direct measurements of arbitrary waveforms is under development. It will contain several Josephson arrays in series biased by a pulse drive based on opto-electronics, in order to increase the output voltage.

  • 49.
    Lartsev, Arseniy
    et al.
    Chalmers University of Technology, Sweden.
    Yager, Tom
    Chalmers University of Technology, Sweden.
    Bergsten, Tobias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tzalenchuk, Alexander
    National Physical Laboratory, United Kingdom; University of London, United Kingdom.
    Janssen, TJBM
    National Physical Laboratory, United Kingdom.
    Yakimova, Rositza
    Linköping University, Sweden.
    Lara-Avila, Samuel
    Chalmers University of Technology, Sweden.
    Kubatkin, Sergey
    Chalmers University of Technology, Sweden.
    Tuning carrier density across Dirac point in epitaxial graphene on SiC by corona discharge2014Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 105, nr 6, artikkel-id 063106Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We demonstrate reversible carrier density control across the Dirac point (Δ n∼ 1013cm-2) in epitaxial graphene on SiC (SiC/G) via high electrostatic potential gating with ions produced by corona discharge. The method is attractive for applications where graphene with a fixed carrier density is needed, such as quantum metrology, and more generally as a simple method of gating 2DEGs formed at semiconductor interfaces and in topological insulators.

  • 50. Li, Yi
    et al.
    Bergman, Anders
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Larzelere, Bill
    Rickmann, Johannes
    Hauschild, Wolfgang
    Diaz, Ricardo
    Garnacho, Fernando
    McComb, Terry
    Zhang, Y
    Elg, Alf Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Past, present and future of IEC and IEEE high-voltage and high current testing standards2014Rapport (Fagfellevurdert)
    Abstract [en]

    Recently, IEC and IEEE have published a number of revised and new standards for high-voltage and high-current testing. Significant changes and additions have been introduced to these revised and new standards. CIGRE WG D1.35 has developed a guide to give high-voltage test engineers a broader knowledge of how to apply the latest high-voltage and high-current testing standards. The guide presents a brief account of the history of these standards with the aim to allow readers to gain a better appreciation of the technical background followed by sections summarize the major changes made to the standards in their latest revisions to provide a general picture of the revisions. Finally, some discussion is given on the practical implications of these changes. Practical examples are provided to illustrate some of the new techniques and new procedures. The guide also lists areas of possible improvements to the standards for future revisions.

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