Final report on COOMET key comparison of power (COOMET.EM-K5)

Abstract

An intercomparison for electrical standards of low-frequency 50 Hz/60 Hz power has taken place within the framework of COOMET. The intercomparison, piloted by State Enterprise 'Ukrmetrteststandard'-UMTS (Ukraine), has involved thirteen laboratories, including one who is a member of another regional metrological organization: EURAMET, APMP, GULFMET, and AFRIMETS. NIM (China) and VNIIM (Russia) are linking NMIs as far as they participated in CCEM-K5. The results presented in this report appear to show that there are significant differences between some laboratories' representations of the watt. However, the agreement demonstrated by the intercomparison provides confidence in maintaining traceability for the power at 50 Hz and 53 Hz for 1.0, 0.5 Lag, 0.5 Lead, 0.0 Lag, 0.0 Lead power factors. 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).

Main Results of COOMET.EM-K5 Key Comparison of Power

“…UMTS was a pilot laboratory responsible for providing the TS, coordinating the schedule, collecting and analysing the comparison data, and preparing the draft report, etc. NIM (China) and VNIIM (Russia) was linking NMIs for the linking process between CCEM-K5 KC and COOMET.EM-K5 KC due to participating in CCEM-K5 [13,14]. Relevance of the comparison results are expected at the level better than 0.005 %.…”

Evaluation results of COOMET Key Comparison of Power

“…3). The correction factor Δ is 0.9 for PF 1.0, 53 Hz (for example) [4,15]. Eni number and zi scores [18][19][20] are most often used to check the consistency of KC data, which are presented in Table 1 and on Fig.…”

Possibilities of Linking Results of EURAMET and COOMET Key Comparisons for Power

“…From 1995 to 2000, CCEM-K5 KC for 50/60 Hz alternating current (AC) power was carried out [13]. 15 NMIs/ DIs participated in this KC, which are the members of five RMOs: EURAMET, APMP, COOMET, SIM and AFRIMET. The NIST (USA) was the pilot laboratory of this KC.…”

“…From 2016 to 2018, COOMET.EM-K5 KC [15,16] for power was carried out. 13 NMIs/DIs participated in this KC, which are the members of five RMOs: COOMET, EURAMET, APMP, AFRIMET and GULFMET.…”

“…Results of NMIs/DIs in EURAMET.EM-K5.1 and COOMET.EM-K5 KCs at frequency of 53 Hz for PF 1.0, 0.5 Lag, 0.5 Lead, 0.0 Lag, 0.0 Lead were linked with respect to the KC RV of CCEM-K5 KC (only for CIPM MRA members) and are presented in [14,15], Table 2, 3 respectively and on Fig. 1-5.…”