1ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13

Barcelona 12-15 May 2003

Question 7 (7.1)

10-CYCLE

INSTRUMENT X

INSTRUMENT Y2 CYCLES

Instrument X V = 1 p.u.Instrument Y V = 1.043p.u.Error = 4.3% for 200ms intervalOver 3 s interval Error = 0.29% > Class A accuracy limit = 0.1%

2ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13

Barcelona 12-15 May 2003

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

3ZAVODA CA ALPHA2 Block 4 – Question 7, 8, 13

Barcelona 12-15 May 2003

Question 8 (8.1, 8.2, 8.3)

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

Barcelona 12-15 May 2003

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 Recloser

Revenue Meter Revenue Meter

Voltage regulator