Calibration services to provide traceability in high-voltage impulse testing to conform with ISO/IEC requirements

The ISO Quality Standards, coupled with the publication of new technical standards, have led to an increased interest in the traceability of measurements. This paper presents a detailed description of the capabilities of NRC to provide simultaneous comparative measurements which is the reference method for qualifying impulse voltage measuring systems. This paper describes the measuring systems in use at NRC for calibrating client´s measuring systems, either at NRC or at the client´s site. Methods of making comparative measurement are reviewed and results from comparative measurements made using a variety of recording instruments are summarized. Recent measurements at NRC are reported to show the accuracy which can be achieved in comparative measurements. The uncertainty of one type of measuring system in use at NRC is estimated from international comparisons. Present work in IEEE and IEC is reviewed to predict the likely developments over the next few years