Jari Hällström

2015

High AC current calibration system based on Rogowski coil

Havunen, J., Suomalainen, E.-P. & Hällström, J., 2015, 2015 ISH: 19th International Symposium on High Voltage Engineering. 6 p.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Long term stability of two 1000 kV voltage dividers

Elg, A., Bergman, A. & Hällström, J., 2015, Proceedings of the 19th International Symposium on High Voltage Engineering, Pilsen, Czech Republic, August, 23 – 28, 2015. University of West Bohemia, 5 p.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

Optimization of field grading for a 1000 KV wide-band voltage divider

Klüss, J., Hällström, J. & Elg, A. P., Feb 2015, In: Journal of Electrostatics. 73, p. 140-150 11 p.

Research output: Contribution to journal › Article › Scientific › peer-review

11 Citations (Scopus)

Performance of a modular wideband HVDC reference divider for voltages up to 1000 kV

Hällström, J., Bergman, A., Dedeoglu, S., Elg, A.-P., Houtzager, E., Klüss, J., Lehtonen, T., Lucas, W., Meisner, J., Merev, A., Nieminen, T., Schmidt, M., Suomalainen, E.-P. & Weber, C., Jun 2015, In: IEEE Transactions on Instrumentation and Measurement. 64, 6, p. 1390-1397

Research output: Contribution to journal › Article › Scientific › peer-review

20 Citations (Scopus)

Tail-Chopped Lightning Impulses Time Parameters Estimated According to Standard IEC 60060-1:2010

Hall Barbosa, C. R., Hällström, J., Da Silva, M. T. F., Azevedo, L. C. & Faria, L. C., Jun 2015, In: IEEE Transactions on Instrumentation and Measurement. 64, 6, p. 1369-1372 4 p.

Research output: Contribution to journal › Article › Scientific › peer-review

5 Citations (Scopus)

Traceability and Characterization of a 1000 kV HVDC Reference Divider

Elg, A.-P., Bergman, A., Hällström, J., Kharezy, M. & Nieminen, T., 2015, In: IEEE Transactions on Instrumentation and Measurement. 64, 6, p. 1709-1715

Research output: Contribution to journal › Article › Scientific › peer-review

11 Citations (Scopus)

2014

A Modular USB 2.0 digitizer for electrical power measurements

Lehtonen, T. & Hällström, J., 12 Sept 2014, 29th Conference on Precision Electromagnetic Measurements (CPEM 2014). IEEE Institute of Electrical and Electronic Engineers, p. 78-79 6898267

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

5 Citations (Scopus)

Estimation of time parameters of tail chopped lightning impulses: Clarification of the standard IEC 60060-1/2010

Hall Barbosa, C. R., Hällström, J., Silva, M. T., Azevedo, L. C. & Faria, L. C., 12 Sept 2014, 29th Conference on Precision Electromagnetic Measurements (CPEM 2014). IEEE Institute of Electrical and Electronic Engineers, p. 778-779 6898617

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

4 Citations (Scopus)

Evaluation of long-term stability of HVDC measuring system based on bandgap references

Merev, A. & Hällström, J., 12 Sept 2014, 29th Conference on Precision Electromagnetic Measurements (CPEM 2014). IEEE Institute of Electrical and Electronic Engineers, p. 376-377 (CPEM Digest (Conference on Precision Electromagnetic Measurements), Vol. 29).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Investigating linearity of a high voltage capacitance bridge

Suomalainen, E. P. & Hällström, J., 12 Sept 2014, 29th Conference on Precision Electromagnetic Measurements (CPEM 2014). IEEE Institute of Electrical and Electronic Engineers, p. 620-621 2 p. 6898538

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

New references for HVDC metering

Hällström, J. (Corresponding author), Bergman, A., Dedeoğlu, S., Elg, A. P., Houtzager, E., Klüss, J., Lehtonen, T., Lucas, W., Merev, A., Meisner, J., Nieminen, T., Suomalainen, E. P., Svensson, S. & Weber, C., 1 Jan 2014.

Research output: Contribution to conference › Conference article › Scientific › peer-review

1 Citation (Scopus)

Performance of a modular wideband 1000 kV HVDC reference divider

Hällström, J., Bergman, A., Dedeoglu, S., Elg, A. P., Houtzager, E., Lehtonen, T., Kluss, J., Lucas, W., Merev, A., Nieminen, T., Meisner, J., Suomalainen, E. P., Schmidt, M. & Weber, C., 12 Sept 2014, 29th Conference on Precision Electromagnetic Measurements (CPEM 2014). IEEE Institute of Electrical and Electronic Engineers, p. 782-783 2 p. 6898619

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

4 Citations (Scopus)

Performance of a wideband 200-kV HVDC reference divider module

Hällström, J., Bergman, A., Dedeoğlu, S., Elg, A.-P., Houtzager, E., Lucas, W., Merev, A., Meisner, J., Schmidt, M., Suomalainen, E.-P. & Weber, C., Sept 2014, In: IEEE Transactions on Instrumentation and Measurement. 63, 9, p. 2264-2270

Research output: Contribution to journal › Article › Scientific › peer-review

19 Citations (Scopus)

2013

Characterization of the linearity of a 1200 kV HVDC divider

Hällström, J., 2013, Espoo: Centre of Metrology and Accreditation (MIKES). 16 p. (MIKES Publication; No. J2/2013).

Research output: Book/Report › Report

Open Access

Method and device for measuring the electric power propagating in a conductor

Immonen, P. (Inventor) & Hällström, J. (Inventor), 10 Apr 2013, IPC No. H01G 5/ 16 A I, Patent No. EP2579049, Priority date 5 Oct 2011, Priority No. FI20110005977

Research output: Patent › Patent

2012

An improved method for switching-impulse evaluation

Nilsson, A., Bergman, A. & Hällström, J., 3 Oct 2012, 2012 Conference on Precision electromagnetic Measurements. IEEE Institute of Electrical and Electronic Engineers, p. 20-21 2 p. 6250638

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

7 Citations (Scopus)

Bilateral three-phase 50 Hz power comparison

Hällström, J., Svensson, S., Suomalainen, E. P. & Immonen, P., 3 Oct 2012, 2012 Conference on Precision electromagnetic Measurements. IEEE Institute of Electrical and Electronic Engineers, p. 118-119 2 p. 6250689

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

1 Citation (Scopus)

Characterization of dielectric properties of insulating materials for use in an HVDC reference divider

Elg, A. P., Kharezy, M., Bergman, A. & Hällström, J., 3 Oct 2012, 2012 Conference on Precision Electromagnetic Measurements, CPEM 2012. IEEE Institute of Electrical and Electronic Engineers, p. 80-81 2 p.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

3 Citations (Scopus)

Demonstration of 50-Hz electrical active power measurement using a micromechanical magnetometer

Rimminen, H., Hällström, J., Immonen, P., Seppä, H., Manninen, A., Latonen, T., Kyynäräinen, J. & Kärkkäinen, A., 2012, Proceedings: Conference on Precision electromagnetic Measurements, CPEM 2012 2012. IEEE Institute of Electrical and Electronic Engineers, p. 232-233

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

1 Citation (Scopus)

Design of a wideband HVDC reference divider

Hällström, J., Bergman, A., Dedeoǧlu, S., Elg, A., Houtzager, E., Lucas, W., Merev, A., Meisner, J., Sardi, A., Suomalainen, E. P. & Weber, C., 3 Oct 2012, 2012 Conference on Precision electromagnetic Measurements. IEEE Institute of Electrical and Electronic Engineers, p. 207-208 2 p. 6250874

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

10 Citations (Scopus)

EURAMET #1172: Bilateral three-phase AC power and energy comparison at power frequency

Hällström, J., Suomalainen, E.-P., Immonen, P. & Svensson, S., 2012, Espoo: Centre of Metrology and Accreditation (MIKES). 18 p. (MIKES Publication; No. J2/2012).

Research output: Book/Report › Report

Open Access

Methods for comparison of loss angle standards at 10 kV level

Hällström, J., Klionsky, M. & Suomalainen, E. P., 3 Oct 2012, 2012 Conference on Precision electromagnetic Measurements. IEEE Institute of Electrical and Electronic Engineers, p. 402-403 2 p. 6250973

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Selection and characterization of resistors for a HVDC reference divider

Houtzager, E., Rietveld, G., Hällström, J., Elg, A. P. & Van Der Beek, J. H. N., 3 Oct 2012, 2012 Conference on Precision electromagnetic Measurements. IEEE Institute of Electrical and Electronic Engineers, p. 197-198 2 p. 6250869

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

8 Citations (Scopus)

2011

Comparison of asynchronous sampling correction algorithms for frequency estimation of signals of poor power quality

Lapuh, R., Clarkson, P., Pogliano, U., Hällström, J. K. & Wright, P. S., 2011, In: IEEE Transactions on Instrumentation and Measurement. 60, 7, p. 2235-2241 7 p.

Research output: Contribution to journal › Article › Scientific › peer-review

8 Citations (Scopus)

2010

Comparison of asynchronous sampling correction algorithms for power quality measurements under realistic conditions

Lapuh, R., Clarkson, P., Pogliano, U., Wright, P. S. & Hällström, J., 21 Sept 2010, 2010 Conference on Precision Electromagnetic Measurements, CPEM 2010. IEEE Institute of Electrical and Electronic Engineers, p. 227-228 2 p. 5545158

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

4 Citations (Scopus)

Metrology for high voltage direct current

Bergman, A., Pogliano, U., Hällström, J., Wright, P., Lucas, W., Merev, A., Rietveld, G., Kurrat, M. & Rickmann, J., 21 Sept 2010, 2010 Conference on Precision Electromagnetic Measurements, CPEM 2010. IEEE Institute of Electrical and Electronic Engineers, p. 669-670 2 p. 5543404

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

3 Citations (Scopus)

Uncertainty estimate of a split-core Rogowski coil for high AC current

Suomalainen, E. P. & Hällström, J., 21 Sept 2010, 2010 Conference on Precision Electromagnetic Measurements, CPEM 2010. IEEE Institute of Electrical and Electronic Engineers, p. 653-654 2 p. 5544844

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

5 Citations (Scopus)

2009

Measuring picosecond flashover in closing coaxial spark gap switch

Klüss, J. & Hällström, J., Jun 2009, In: Acta Physica Polonica A. 115, 6, p. 1004-1006 3 p.

Research output: Contribution to journal › Article › Scientific › peer-review

Open Access

2008

An accurate asynchronous calculation method for evaluating peak and RMS values from sampled data

Suomalainen, E. P. & Hällström, J., 23 Sept 2008, 2008 Conference on Precision Electromagnetic Measurements Digest, CPEM 2008. IEEE Institute of Electrical and Electronic Engineers, p. 372-373 2 p. 4574808

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

1 Citation (Scopus)

Influence of busbar geometry on AC current measurement using Rogowski coil

Chekurov, Y. & Hällström, J., 23 Sept 2008, 2008 Conference on Precision Electromagnetic Measurements Digest, CPEM 2008. IEEE Institute of Electrical and Electronic Engineers, p. 542-543 2 p. 4574893

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

8 Citations (Scopus)

On-site calibration of a current transformer using a Rogowski coil

Suomalainen, E. P. & Hällström, J., 23 Sept 2008, 2008 Conference on Precision Electromagnetic Measurements Digest, CPEM 2008. IEEE Institute of Electrical and Electronic Engineers, p. 468-469 2 p. 4574856

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

2 Citations (Scopus)

2007

Construction and performance evaluation of calibration system for low voltage impulse

Wakimoto, T., Shimizu, H., Ishii, M., Hällström, J. & Lucas, W., 2007, In: IEEJ Transactions on Power and Energy. 127, 1, p. 261-266

Research output: Contribution to journal › Article › Scientific › peer-review

Open Access

5 Citations (Scopus)

High-accuracy comparison of lightning and switching impulse calibrators

Wakimoto, T., Hällström, J. K., Chekurov, Y., Ishii, M., Lucas, W., Piiroinen, J. & Shimizu, H., 2007, In: IEEE Transactions on Instrumentation and Measurement. 56, 2, p. 619-623

Research output: Contribution to journal › Article › Scientific › peer-review

16 Citations (Scopus)

Method and arrangement for triggering a series spark gap

Hallstrom, J. (Inventor), Kansala, T. (Inventor) & Holm, H. (Inventor), 11 Jan 2007, IPC No. H02H 9/ 06 A N, Patent No. AU2006264897, Priority date 29 Jun 2006, Priority No. WO2006FI50296

Research output: Patent › Patent application

Worldwide comparison of lightning impulse voltage measuring systems at the 400-kV level

Hällstrom, J. (Corresponding Author), Aro, M., Bergman, A., Bovier-Lapierre, V., Garnacho, F., Juvik, J. I., Kiseliev, V., Lian Hong, Z., Lucas, W., Li, Y., Pykälä, M. L., Rungis, J., Schon, K. & Truong, V. H., 2007, In: IEEE Transactions on Instrumentation and Measurement. 56, 2, p. 388-391

Research output: Contribution to journal › Article › Scientific › peer-review

7 Citations (Scopus)

2005

Comparison of two impulse calibrators with a high-resolution digitizer

Yi, L., Hällström, J. K. & Lucas, W., 2005, In: IEEE Transactions on Instrumentation and Measurement. 54, 2, p. 608-611

Research output: Contribution to journal › Article › Scientific › peer-review

5 Citations (Scopus)

2004

EUROMET 495 comparison of high direct voltage measurements up to 100 kV

Jones, R. G., Wheaton, A. J., Clarkson, P., Marx, R., Schon, K., Sardi, A., Saracco, O., Giorgi, P. A., La Paglia, G., Varetto, G., Bergmann, A., Sandberg, A., Hällström, J., Chekurov, Y., Jeanneret, B., Jeckelmann, B., Flueli, M., Gournay, P., Koijmans, C. V. & Dierikx, E. F., 1 Dec 2004, 2004 Conference on Precision Electromagnetic Measurements Digest, CPEM 2004. p. 254-255 4097213

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

1 Citation (Scopus)

Fast resistive attenuators for high accuracy measurements of LI voltages

Chekurov, Y. Y. & Hällström, J. K., 1 Dec 2004, 2004 Conference on Precision Electromagnetic Measurements Digest, CPEM 2004. IEEE Institute of Electrical and Electronic Engineers, p. 328-329 4097253

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

5 Citations (Scopus)

2002

A calculable impulse voltage calibrator

Hällström, J., 1 Jan 2002, Helsinki University of Technology. 107 p.

Research output: Thesis › Dissertation › Collection of Articles

Calculable impulse voltage calibrator for calibration of impulse digitizers

Hällström, J., Chekurov, Y. & Aro, M. M., 1 Jan 2002, In: CPEM Digest (Conference on Precision Electromagnetic Measurements). p. 286-287 2 p.

Research output: Contribution to journal › Article in a proceedings journal › Scientific › peer-review

4 Citations (Scopus)

1999

Intercomparison of AC peak voltage measurement

Bergman, A. (Corresponding author), Marx, R., Schon, K., Suomalainen, E. P. & Hällström, J., 1999, 1999 Eleventh International Symposium on High Voltage Engineering. Institution of Engineering and Technology IET, Vol. 1. p. 1.9.S1-1.12.S1

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

1989

Multichannel detection of magnetic compound action fields of median and ulnar nerves

Hari, R., Hällström, J., Tiihonen, J. & Joutsiniemi, S. L., Mar 1989, In: Electroencephalography and Clinical Neurophysiology. 72, 3, p. 277-280 4 p.

Research output: Contribution to journal › Article › Scientific › peer-review

47 Citations (Scopus)

1988

Neuromagnetic responses from a deaf subject to stimuli presented through a multichannel cochlear prosthesis

Hari, R., Pelizzone, M., Mäkelä, J. P., Hällström, J., Huttunen, J. & Knuutlla, J., Jun 1988, In: Ear and Hearing. 9, 3, p. 148-152 5 p.

Research output: Contribution to journal › Article › Scientific › peer-review

18 Citations (Scopus)

1987

A Low-Noise Seven-Channel DC SQUID Magnetometer for Brain Research

Kajola, M., Ahlfors, S., Ahonen, A., Hällström, J., Knuutila, J., Lounasmaa, O. V., Tesche, C. & Vilkman, V., Jan 1987, In: Japanese Journal of Applied Physics. 26, S3-2, p. 1555-1556 2 p.

Research output: Contribution to journal › Article › Scientific › peer-review

Large-area low-noise seven-channel dc SQUID magnetometer for brain research

Knuutila, J., Ahlfors, S., Ahonen, A., Hällström, J., Kajola, M., Lounasmaa, O. V., Vilkman, V. & Tesche, C., 1987, In: Review of Scientific Instruments. 58, 11, p. 2145-2156 12 p.

Research output: Contribution to journal › Article › Scientific › peer-review

88 Citations (Scopus)

Neuromagnetic responses of the human auditory cortex to on- and offsets of noise bursts

Hari, R., Pelizzone, M., Mäkelä, J. P., Hällström, J., Leinonen, L. & Lounasmaa, O. V., 1987, In: International Journal of Audiology. 26, 1, p. 31-43 13 p.

Research output: Contribution to journal › Article › Scientific › peer-review

235 Citations (Scopus)

1986

Design of a 7-channel DC-SQUID gradiometer for brain research

Ahonen, A. I. (Corresponding author), Hallstrom, J. K., Kajola, M. J., Knuutila, J. E., Tesche, C. D. & Vilkman, V. A., 1 Dec 1986, Proceedings of the International Cryogenic Engineering Conference, ICEC 11. Klipping, G. & Klipping, I. (eds.). Butterworth-Heinemann, p. 820-824 5 p.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

4 Citations (Scopus)

Jari Hällström

Research output

Search results