ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona May 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%

ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona May 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 ) Temporal aggregation (one-minute) (IEC , 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

ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona May Question 8 (8.1, 8.2, 8.3)

ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13 Barcelona May 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