1. Cost-optimised Maintenance Strategy for 110 kV-Networks Dr
Cost-optimised Maintenance Strategy for 110 kV-Networks Dr. Markus Zdrallek RWE Net AG Germany

2. Optimised maint. strategy Assignment to components
Importance of Network Components
Optimised maint. strategy
4. Step:
Optimised maintenance strategy 0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
MA-group 1
MA-group 2
MA-group 3
MA-group 4
MA-group 5
Importance index w i
in %
Imp. Index & Ranking
3. Step:
Importance Index & Ranking
Each component is related to the most important component
Assignment to components
2. Step:
Which part of network’s non-reliability is caused by an individual component ?
Reliability
Calculation
1. Step:
Reliability Calculation
Network-, Protection- and Reliability data
MV-customers “Energy not delivered in time”
Non-reliability of the network

3. Importance Ranking of Substations20 40 60 80
100
MA-group 1
MA-group 2
MA-group 3
MA-group 4
MA-group 5
Importance index w i
in %
Substation

4. Back up

5. Importance of Network Components
Reliability
Calculation
1. Step:
Reliability Calculation
Network-, Protection- and Reliability data
MV-customers “Energy not delivered in time”
Non-reliability of the network

6. Result of Reliablity Calculation
0,0
0,5
1,0
1,5
2,0
2,5
3,0
MV-customers
Energy not delivered in time in MVAh/a

7. Assignment to components
Importance of Network Components
Reliability
Calculation
2. Step:
Assignment to components
Which part of network’s non-reliability is caused by an individual component ?
Assignment to components

8. Assignment to components
81%
17% 2% 5 10 15 20 25 30 35 40 45 50
Energy not delivered in time in MVAh/a
f (E)
F (E)
Cables / Overhead lines
Transformer substations
Transformers

9. Assignment to components
Importance of Network Components
Reliability
Calculation
3. Step:
Importance Index & Ranking
Each component is related to the most important component
Assignment to components
Imp. Index & Ranking