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Two high-voltage (HV) impulse dividers, one rated for 300 kV and the other for 1 MV, were circulated to seven laboratories within the European Community. Each laboratory measured the voltage ratio, step response parameters, peak voltage errors and front time errors of the dividers according to the revision draft of IEC 60. All participating laboratories agreed within +/- 0.15% for the ratio measurement in the range of 220:1, which is acceptable. The response parameters as reported by the laboratories showed a wide spread. The majority of the laboratories, however, agreed to mean values of the response time and the partial response time within +/- 5 ns, which is acceptable. The voltage and time errors of the two dividers under test were measured by comparison with each other and with the laboratory's reference divider at full and chopped impulses of 100 kV. The majority of the laboratories agreed to mean peak voltage errors within +/- 0.2% for full voltages and within +/- 0.5 to 2 % for impulses chopped at T(C) = 1.5 to 0.5 microsec. The spread of the front time errors was, in general, within +/- 3.5% for full and chopped impulses. The comparison between two divider systems can thus be made at most laboratories with an uncertainty of approximately only one third of the IEC error limits. This intercomparison of HV impulse dividers is another important step towards the traceability of HV measurements within the European Community. The results, however, also indicate the need for further investigations in this field.

Additional information

Authors: LIGHTFOOT H A, Central Electricity Research Laboratories, Leatherhead (GB);HUGHES R C, Central Electricity Research Laboratories, Leatherhead (GB);BONAMY A, Electricité de France, Moret sur Loing (FR);DESCHAMPS F, Electricité de France, Moret sur Loing (FR);VAN BOETZELAER BARON A W, Tot Keuring van Elektrotechnischematerialen, Arnhem (NL);VEENSTRA H, Tot Keuring van Elektrotechnischematerialen, Arnhem (NL);BOMBONATO M ET AL., Centro Elettrotecnico Sperimentale Italiano, Milano (IT);GARNACHO F ET AL., Laboratorio Central Oficial de Electrotecnia, Madrid (ES);VALE A ET AL., Electricidade de Portugal, Sacavem (PT)
Bibliographic Reference: EUR 13683 EN (1991) 668 pp., MF, ECU 28
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