1. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 1 Successful implemented Condition Based Maintenance for switchgear Presenter: E.R.S. Groot Session No 1, Paper No 14 Edwin R.S. GROOT Nuon InfraCore Edward GULSKI Delft University Abe van DAM Eneco Netbeheer Frank J. WESTER Nuon InfraCore The Netherlands

2. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 2 A guided tour through the implementation process of CBM (step by step) based on questions and problems we dealed with

3. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 3 Where did we start?? (more then 60 different type of switchgear) Based on the selection criteria: Current maintenance costs Current outage time for maintenance Risk for maintenance induced failures Population size Age and expected lifetime Current failure behaviour and frequency …….we started with a minimum oil breaker

4. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 4 What are critical components of this switchgear ?? We applied an FMECA approach and weighted each component Failure frequency (score 0,1,2) Impact of failure on energy supply (score 1,2,3) Corrective costs (score 1,2,3) Environmental impact (score 1,2)

5. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 5 FMECA register (screen dump)

6. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 6 The outcome of the FMECA exercise resulted in a new optimised maintenance program ….. A mixture of maintenance, inspections and measurement activities were focused on critical components only This optimised maintenance program resulted in the first cost reduction of 29%

7. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 7 How do we: - control and update the new maintenance program in the field - support the electrician with actual norms and instructions - guaranty the continuation of feed back of field experience

8. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 8 Therefore we developed the Inspector software tool:

9. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 9 Field support with actual norms and instructions

10. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 10 How do we handle the increased amount of data like: Measurement results Inspection results Maintenance information Failure information

11. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 11 We developed the I-Core database type time analysis

12. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 12 The I-Core database for: storage of data (measurement and inspection results, failure information etc) optimising norms and criteria research of aging mechanisms improvement and optimisation of the condition based maintenance program

13. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 13 Example: correlation between moisture level in oil and aging of coqolite

14. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 14 Example: norm and criteria optimisation Probability density curve of switching velocity Correlation between contact pressure and velocity Norm definition for velocity based on large population measured data Define a maximum norm for contactpressure based on influence on velocity

15. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 15 The outcome of the data analyses resulted in a further optimised maintenance program ….. The optimisation of both the mixture of maintenance and measurement activities and frequency resulted in a total cost reduction of 35%

16. E.R.S. Groot, The Netherlands, Session 1, Block 1.1: SWITCHGEAR Barcelona 12-15 May 2003 16 Conclusion Good experiences with CBM Still implemented it succesfully for other type of switchgear Growing importance for condition data (not only as a foundation for CBM)