Guaranty of Supply Availability in a Competitive Environment – Strategy and Experience of a German Distribution Company CIRED Conference 2003, Barcelona Contribution to Session 2, Block 4 Dr.-Ing. Peter Birkner, Business Unit System Operation, Lechwerke AG, Augsburg, Germany

Improvement of System Information via Fault Distance Location Relays Improvement of grid performance despite of reduction of number of service points 5

Improvement of System Information via Fault Distance Location Relays Restrictions on reclosure of overhead line feeders due to legal con- siderations lead to an increase of non delivered energy per outage 5

Improvement of System Information via Fault Distance Location Relays Dig. DIS Development of fault location strategy in the 20 kV grid: Fault location via systematic “trial and error” Fault distance location relays in all feeders Fault distance location relays in transformer switch bay 1 2 3

Improvement of System Information via Fault Distance Location Relays If a customer experiences an outage less often, non delivered energy per outage can be increased: E(Deficiency Probability) = E(Outage Duration) x E(Outage Frequency) E(Non Delivered Energy) = E(Deficiency Probability) x Outage Power 1,000 kWh non delivered energy per outage in the case of 1.0 – 1.5 outages per year 2,000 kWh non delivered energy per outage in the case of 0.5 outages per year 3,000 kWh non delivered energy per outage in the case of 0.1 outages per year 5