1. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 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?

2. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 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

3. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 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

4. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 May 2003 University of Girona 4  Classification results Transversal classification 111 - 565 Stage classification 1 - 51 - 61 - 5 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

5. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 May 2003 University of Girona 5 0 2 4 6 8 10 12 14 16 18 113121123131221223224314321322324333334413433463513 524 533535544554555 Classes Percentage(%) Differed I nstantaneous Zone 3 Zone 2 Zone 1 Class composition according to the fault location scheme ?? Distribution Transmission Distribution Transmission

6. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 May 2003 University of Girona 6 State composition according to voltage sag type 0 5 10 15 20 25 30 35 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

7. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 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. 0 2 4 6 8 10 12 14 16 18 113 121123131221 22 3 224314321322324 333 334 413 433 463 513 524 533535544554555 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

8. Juan Mora SP Session 2 – Block 3 – Question 8.1 Barcelona 12-15 May 2003 University of Girona 8 Juan Mora Joaquim Meléndez Joan Colomer jjmora@eia.udg.esquimmel@eia.udg.escolomer@eia.udg.es http://eia.udg.es/exit Classification of Sags Measured in a Distribution Substation based on Qualitative and Temporal Descriptors (2.60) David Llanos Javier Corbella Jorge Sánchez dllanosr@eia.udg.esfjCorbella@enher.es jslosada@fecsa.es Thanks !!