1. 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

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

3. 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

4. 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

5. 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