1. Verification of algorithm introduced in
“Assessment of voltage dips in HV-networks”
M. Didden - K.U.Leuven

2. Introduction
Goossens et al. introduced an algorithm converting RMS-voltages of a PN measurement of a dip into RMS-voltages PP using the Bollen A/G dip-classification
Analysis of 575 incidents in the Belgian HV-grid revealed the following deviations of estimated dip by the algorithm and real dip value

3. Conclusions Dip type Number of dips Difference (% Urated) A 103 0,7 B
179
5,0 C 85
3,0 D
169
1,6 E 11
5,3 F 9
1,8 G 19
Conclusions
- Results sufficiently accurate for statistical purposes.
- For analysing isolated incidents, an average deviation of 5% Urated is too high. The algorithm therefore needs some fine- tuning.