Regulation and Classification of voltage dips

The impact of voltage dips on industrial installations can be very high. However, regulation within the European Standard EN 50160 is not detailed as the cells within the general table are not filled. As there is no reference on the expected number of voltage dips, the responsibilities for network operator and customer are unclear. Therefore the customers face challenges to make analysis on required mitigation measures. The Dutch Regulator requested the network operators to prepare a proposal for a regulatory framework regarding voltage dips. This paper presents the initial proposal for the MV distribution network. Based on the effect of various types of voltage dips to the reduction of active-power for aggregated customers, voltage dip severity weighting factors are developed and used to build the proposal

Factors Associated with Revision Surgery after Internal Fixation of Hip Fractures

Background: Femoral neck fractures are associated with high rates of revision surgery after management with internal fixation. Using data from the Fixation using Alternative Implants for the Treatment of Hip fractures (FAITH) trial evaluating methods of internal fixation in patients with femoral neck fractures, we investigated associations between baseline and surgical factors and the need for revision surgery to promote healing, relieve pain, treat infection or improve function over 24 months postsurgery. Additionally, we investigated factors associated with (1) hardware removal and (2) implant exchange from cancellous screws (CS) or sliding hip screw (SHS) to total hip arthroplasty, hemiarthroplasty, or another internal fixation device. Methods: We identified 15 potential factors a priori that may be associated with revision surgery, 7 with hardware removal, and 14 with implant exchange. We used multivariable Cox proportional hazards analyses in our investigation. Results: Factors associated with increased risk of revision surgery included: female sex, [hazard ratio (HR) 1.79, 95% confidence interval (CI) 1.25-2.50; P = 0.001], higher body mass index (fo

Measurement of the current distribution near a substation during a single phase to ground fault

Contribution to Question QI-2.1, group 36 Power System Electromagnetic Compatibilit

Measurement of the current distribution near a substation during a single phase to ground fault

Contribution to Question QI-2.1, group 36 Power System Electromagnetic Compatibilit