In 2016 the Consultative Committee for Electricity and Magnetism (CCEM) commissioned a supplementary comparison EURAMET.EM-S42 of Lightning Impulse (LI) measurement systems. This comparison was piloted by RISE (Sweden, formerly SP), and it was supported by VTT MIKES (Finland) and FFII LCOE (Spain). Eleven National Metrology Institutes (NMI) and two Designated Institutes (DI) from four Regional Metrology Organizations, EURAMET, COOMET, APMP and SIM, took part in the comparison.

A commercial travelling measuring system (TRMS) for Lightning Impulse (LI) measurement was adopted for the comparison. The TRMS consisted of a 700 kV resistive voltage divider and a transient recorder with computer. The TRMS was calibrated by the pilot lab in November 2016 before start of the comparison, and the first circulation was between five EURAMET NMI/DIs. After an intermediate calibration by the pilot lab in July 2017, the TRMS was circulated between seven NMI/DIs in the other regional organisations. On the return of the TRMS in March 2019 a final calibration was made by the pilot lab.

The measured parameters are defined in IEC60060-1. Test voltage value (U_t), front time (T₁), time to half value (T₂) and relative overshoot (β') were measured for full impulses; and extreme value (U_e) and time to chopping (T_c) for front chopped waveform. The test voltage value ranged from -700 kV to 700 kV with two full and one chopped impulse waveform. A set of preferred voltage levels and waveforms was defined. The obtained expanded uncertainties (k = 2) of the comparison reference values (CRV) were: <0.3% for U_t, <1.3% for T₁, <1.0% for T₂, <0.4% for β', <0.6% for U_e and <1.4% for T_c.

The transfer reference measuring system of the previous LI comparison (EU-SMT4-CT98-2270), arranged between 1999 and 2002, is linked to this comparison. The link is established by comparing VTT MIKES system used 20 years ago with that used in this comparison.

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).

2016年，电磁学咨询委员会（CCEM）委托对闪电脉冲（LI）测量系统进行补充比较EURAMET.EM-S42。这种比较是由RISE（瑞典，以前是SP）进行的，并得到了VTT MIKES（芬兰）和FFII LCOE（西班牙）的支持。来自四个地区计量组织EURAMET，COOMET，APMP和SIM的11个国家计量研究所（NMI）和两个指定研究所（DI）参加了比较。

比较采用了用于雷电脉冲（LI）测量的商用行进测量系统（TRMS）。TRMS由一个700 kV电阻分压器和一个带计算机的暂态记录仪组成。在开始比较之前，试验实验室已于2016年11月对TRMS进行了校准，并且第一次循环是在五个EURAMET NMI / DI之间进行的。在试点实验室于2017年7月进行中间校准后，TRMS在其他区域组织的七个NMI / DI之间进行了循环。在2019年3月TRMS返回时，试点实验室进行了最终校准。

测量的参数在IEC60060-1中定义。测量全脉冲时的测试电压值（U _t），前沿时间（T ₁），达到半值的时间（T ₂）和相对过冲（β'）。前截波的极值（U _e）和截波时间（T _c）。测试电压值在-700 kV至700 kV范围内，具有两个全脉冲和一个斩波脉冲波形。定义了一组优选的电压电平和波形。所获得的比较参考值（CRV）的扩展不确定度（k = 2）为：U _t <0.3 ％，T ₁ <1.3％，T 1.0 <1.0％T ₂，对于β'<0.4％，对于U _e <0.6％和对于T _c <1.4％。

之前的LI比较（EU-SMT4-CT98-2270）的传输参考测量系统（在1999年至2002年之间）与该比较相关。通过将20年前使用的VTT MIKES系统与此比较中使用的系统进行比较来建立链接。

要获得本文的正文，请单击“最终报告”。请注意，此文本显示在BIPM密钥比较数据库kcdb.bipm.org/的附录B中。

根据CIPM相互认可安排（CIPM MRA）的规定，最终报告已由CCEM进行同行评审并批准发布。