ABB Excount II User Manual page 62

6. Surge arrester monitoring theory
62
Evaluation of resistive leakage current levels
By means of the manufacturer information, the resistive leakage
current level is determined from the resistive third harmonic current,
and the results obtained under the actual operating conditions are
converted to the standard operating conditions. After conversion, the
results of the leakage current measurements can be evaluated in two
different ways:
• The converted leakage current level can be compared with previous
results obtained for the same arrester, to reveal any significant chan-
ges in the leakage current level over time.
• The converted leakage current level can be compared with the
maximum level recommended by the arrester manufacturer.
These comparisons are carried out by the EXCOUNT-II software. The
results may be presented and documented in graphs, tables and
reports.
References
[1] IEC 60099-5 Ed. 1.1 (2000-03): Surge arresters - Part 5: Selection
and application recommendations.
[2} J. Lundquist, L. Stenström, A. Schei, B. Hansen, "New Method
for Measurement of the Resistive Leakage Currents of Metal-Oxide
Surge Arresters in Service," IEEE Trans. On PWRD, Vol. 5, No. 4,
November 1990.
1HSA 801 080-15en EXCOUNT-II Users Manual