1. ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona 12-15 May 2003 1 Question 7 (7.1) Instrument X V = 1 p.u. Instrument YV = 1.043p.u. Error = 4.3% for 200ms interval Over 3 s interval Error = 0.29% > Class A accuracy limit = 0.1%

2. ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona 12-15 May 2003 2 Question 8 (8.1, 8.2, 8.3) Definition of events System events Complex events examples Methods of processing dips, swells and short interruptions Summation Phase aggregation (IEC 61000-4-30) Temporal aggregation (one-minute) (IEC 61000-2-8, IEEE 1159) –On a phase-by-phase basis –On a 3-phase basis –Severity and duration of aggregated events Statistical processing of voltage dips and short interruption data Extrapolation up to one year not recommended

3. ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona 12-15 May 2003 3 Question 8 (8.1, 8.2, 8.3)

4. ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona 12-15 May 2003 4 Question 13(13.2, 13.3, 13.4) An Overhead Distribution Line has the potential to provide PQ raw and processed data from: Substation Located Circuit Breaker Controller (MV) or PQ Analyser connected to the Substation Busbar Reclosers Controllers (MV) Voltage Regulator Controller (MV) Intelligent Revenue Meters (LV) PQ Analysers connected to the distribution line at strategic locations (if necessary) Substation Recloser Revenue Meter Voltage regulator