Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona 1 A slide has to be easy to read It must not be too crowded It should contain no more than 6 lines No more than 8 words per line Diagrams must not be too detailed Commented paper title: Classification of Sags Measured in a Distribution Substation based on Qualitative and Temporal Descriptors (2.60) Relevant question in the special report: Question 8.1: Is the classical characterisation and classification method for voltage dips (in terms of depth / duration) satisfying? Should other characterisation techniques – such as described in Papers 2.50 or 2.60 – be preferred, among other things in terms of predicting equipment sensitivity?

Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona 2  Summary Fuzzy Classification X (Voltage Sag) Descriptor abstraction x 1 : Sag duration x 2 : Sag magnitude x n : Recovery slope Sag descriptors Sag Class H1 C1 H2 C2 H3 C4 H 4 C 7 H5 C3 Trans – Zone 1 Distr – Inst Distr – Diff Trans – Zone 2 Trans – Zone 1 Prototype P10 P11 P18 P14 P21 Fault location Expert analysis

Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona 3 Three phase voltage sag descriptors ( Magnitude and Duration ) Fall System under faultRecovery Minimum stage duration Voltage fall slope Single phase sag magnitude (h) Single phase sag duration Time 0.9 Vrms [p.u.] 1.0 Voltage recovery slope  Definition - Voltage sag descriptors Single phase voltage sag descriptors Three phase voltage sag descriptors Single phase voltage sag descriptors

Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona 4  Classification results Transversal classification Stage classification Classification Fall System under faultRecovery Minimum stage duration 0.9 Vrms [p.u.] Time Voltage fall slope Single phase sag magnitude (h) Single phase sag duration 1.0 Voltage recovery slope

Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona Classes Percentage(%) Differed I nstantaneous Zone 3 Zone 2 Zone 1 Class composition according to the fault location scheme ?? Distribution Transmission Distribution Transmission

Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona 6 State composition according to voltage sag type ACaCbCcDaDbDc Voltage sag type Percentage (%) Differed Instantaneous Level 3 Level 2 Level 1 Differed I nstantaneous Zone 3 Zone 2 Zone 1 If the sag classified as 554 is type ADistribution System sag

Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona 7 The proposed approach consider temporal descriptors and type of voltage sags. It helps to determine classes that are strongly related to the fault location Classes P ercenta g e Differed Instantaneous Zone 3 Zone 2 Zone 1  Conclusion Fall System under faultRecovery Minimum stage duration 0.9 Vrms [p.u.] Time Voltage fall slope Single phase sag magnitude (h) Single phase sag duration 1.0 Voltage recovery slope

Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona May 2003 University of Girona 8 Juan Mora Joaquim Meléndez Joan Colomer Classification of Sags Measured in a Distribution Substation based on Qualitative and Temporal Descriptors (2.60) David Llanos Javier Corbella Jorge Sánchez Thanks !!