Tom L. Nelson

Intercomparison of calibration systems for AC shunts up to audio frequencies

An intercomparison of calibration systems for ac shunt up to audio frequencies between the National Research Council of Canada, Japan Electric Meters Inspection Corporation, and the National Institute of Standards and Technology, U.S.A., is presented. The transfer standard used for the intercomparison is a 10 A, 0.1 shunt

An international comparison of 50/60 Hz power (1996-1999)

An international comparison of 50/60 Hz power is described. The traveling standard was an electronic power transducer which was tested at 120 V, 5 A, 53 Hz, at five power factors (1.0, 0.5 lead, 0.5 lag, 0.0 lead, and 0.0 lag). Fifteen national metrology institutes from six metrology regions participated in the comparison.

A bilateral comparison between NIST quantum-based power standard and NRC current-comparator-based power standard

The results of a bilateral comparison on active/reactive power meter calibrations between the National Institute of Standards and Technology (NIST) and the National Research Council (NRC) will be presented. The comparison was implemented using a transfer standard consisting of a highly stable commercial sampling-type power/energy meter. The measurements were made at 120 V, 5A, 50 Hz and 60 Hz, at power factors of 1.0, 0.5 lead and lag, and 0.0 lead and lag.

SIM international comparison of 50/60 Hz energy (2002?2007)

An energy storage device such as an electric double layer capacitor has positive and negative electrodes, each including a blend of respective first and second activated carbon materials having distinct pore size distributions. The blend (mixture) of first and second activated carbon materials may be equal in each electrode.

NRC-NIST intercomparison of power meter calibrations at 60 Hz and ranges up to 600 V, 100 A

A number of international comparisons of power meter calibrations at power frequencies were conducted in the past, however, all of them were done at 120 V and 5 A. This intercomparison of power meter calibrations between the National Research Council of Canada and the National Institute of Standards and Technology, USA, was done to include voltage ranges up to 600 V, current ranges up to 100 A, and at power factors of 1.0, 0.5 lead and lag, and 0.0 lead and lag. The comparison was implemented by a transfer standard consisting of a modified commercial time-division multiplier type wattmeter based on a development at the National Research Council of Canada.

NRC-NIST intercomparison of calibration systems for current transducers with a voltage output at power frequencies

Summary form only given. A number of international comparisons of current transformer calibrations at power frequencies were conducted in the past. However, all of them were done with a secondary current output of 5 A. This intercomparison of current transformer calibration systems between the National Research Council of Canada and the National Institute of Standards and Technology, USA, is done with a primary current range of 100 A and a secondary output signal of voltage range of 10 V. The comparison is implemented with a transfer standard consisting of a modified commercial current-comparator-based transimpedance with the output voltage adjustable in magnitude and phase within a range of /spl plusmn/1 percent.

Final report: Key comparison of 50/60 Hz power SIM.EM-K5

Under the auspices of the Committee Consultative of Electromagnetism, CCEM, the SIM Electromagnetic Working Group carried out a key comparison of power standards at 50/60 Hz. This key comparison, identified as SIM.EM-K5, aims to provide a link to various NMIs in the SIM region to the CCEM-K5 key comparison on 50/60 Hz power completed in 2001 and piloted by NIST. Measurements in the SIM.EM-K5 comparison were carried out from May 2010 to March 2012, including testing points of active and reactive power. CENAM was the pilot laboratory. Differences between the measurement results of the participating laboratories and the reference value of this key comparison, calculated at each of all the testing points, show a good infrastructure of national standards of measurement of electric power in the SIM region. Based on previous work, a link has been estimated between the results of the CCEM-K5 and the SIM.EM-K5 key comparisons, whose results were reported in 2002 and 2014, respectively. From the link it is shown that the measurement results of SIM.EM-K5 comparison are well supported. The SIM.EM-K5 comparison is a rewording exercise of comparison of the national standards of measurement as recommended by the CIPM. The participating laboratories are fully recommended for their enthusiastic participation in the comparison. Their individual efforts to maintain the national standards of power measurement are acknowledged. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

Results of the SIM.EM-K5 key comparison of 50/60 Hz power

From years 2010 to 2012, a key comparison of power standards at 50/60 Hz was conducted in the SIM region. The comparison included measurements of active and reactive power at three frequencies, aiming at providing support to high accuracy measurement needs of reactive power. This paper presents the results of the SIM.EM-K5 comparison and the assessment of the link between this comparison and the CCEM-K5 key comparison on 50/60 Hz power completed in 2001.

A current-comparator-based system for on-site calibrations of high voltage PMU systems

The development of a current-comparator-based system for on-site calibrations of high voltage phasor measurement unit systems will be presented. Measurement can be made under actual power system operating conditions with voltages up to 100 kV line-to-ground and currents up to 2000 A at 50 Hz or 60 Hz.

An international comparison of 50/60 Hz reactive power meter calibrations between NRC, NIST, CENAM, NIM, and KRISS

A number of international comparisons of active power meter calibrations were conducted in the past. This paper addresses the international comparison of reactive power meter calibrations at 120 V, 5 A, 50/60 Hz, and power factors 0.5 lead/lag, and zero lead/lag, between 5 NMIs; 3 from the SIM metrology region (NRC, NIST, CENAM) and 2 from the APMP metrology region (NIM and KRISS).