MAJOR UNDERGROUND’S WORK CENTER / FEEDER MAINTENANCE PROGRAM JOHN MLAKAR Major Underground

1. MAJOR UNDERGROUND’S WORK CENTER / FEEDER MAINTENANCE PROGRAM JOHN MLAKAR Major Underground John.j.mlakar@centerpointenergy.com

2. Everyone is aware that the purpose of maintenance is ?

3. Fram Filters

4. What is Your Maintenance Direction ? Pro Active (pay me now) Planning Training Project Control Test & Evaluate Design Control Quality Control Maintenance Control Reactive (pay me later) Scrap Rebuilding Expediting Excessive Inventory Warranty Services Complaint Mediation Product Recalls

5. Pro Active (Pay Me Now) Reactive (Pay Me Later) 12 to 20 % in additional Project costs 3 to 5 % in additional Project costs

6. TYPICAL MAINTENANCE TYPES

7. Restoration of an un-failed device to arrest, reduce, or eliminate deterioration Preventive Maintenance Maintenance carried out at regular intervals (rigid schedule) Scheduled Maintenance Maintenance directed by inspections, tests and condition monitoring Predictive Maintenance Maintenance requiring immediate attention after monitoring detects an imminent failure Emergency Maintenance

8. So what most of us call our Preventive Maintenance Program is actually Scheduled - Predictive Maintenance with the occasional Emergency Maintenance project encountered to maintain balance in the program

9. Major Underground Department is comprised of several thousand Customer Work Centers with even more miles of Feeder Circuits connecting them.

10. The Customer Work Centers are placed into 3 groups • Padmount • Vault • Network • Transformer with fusing • Transformers with manual transfer • Network Subway • Transformer with a manual switch • Transformers with motor switch transfer • Network Radial • Transformer with a switch & breaker • Transformers with 2 breaker auto transfer • Network 208 • Transformer with a pole recloser • Transformers with 3 breaker auto transfer • High-Side Spot Network

11. The Cable Feeders are placed into two groups

12. Work Center attachments are also grouped

13. Equipment is then grouped by Customer Work Center Types Padmount Vault Subway

14. Maintenance Criteria is then established for each piece of equipment • Manufacturer maintenance recommendations • Customer Work Center priorities • Hospitals, Large commercial & industrial facilities • Progressive aging of the in service products • Monitoring of in service operations • Environmental hazards • Heat, Dust, Flooding, Lightning, etc.

15. Each piece of equipment is evaluated and assigned Maintenance criteria for input into SAP (administrative software) • Customer service arrangement • Vault, Padmount, Manual, Auto or Network • Crew makeup to perform the maintenance • Majority performed with 2 man crew • Man-hours required to complete the project • Frequency of maintenance • Monthly, Semi-Annual, Annually

16. The basic Maintenance program of Inspections and Testing is now established Varying frequencies of Inspection: 6mth, 1 yr, 2 yrs, 3 yrs, 5 yrs, 10 yrs Varying frequencies of Testing: 1 yr, 2 yrs, 3 yrs, 5 yrs

17. Circuit Switching Customer Outages Trouble Restoration MAINTENANCE PROGRAM Battery Maintenance Remote Monitoring SPCC Oil Survey Outside influences provide input for change to the Major Underground Maintenance program

18. Remote monitoring of in service equipment provides invaluable information for evaluating maintenance controls

19. Monitoring also provides constant operation and load data as well as environmental temperature and water sensing which affect changes to maintenance program.

20. Other influences affecting the evolution of the Maintenance Program • Replacement of older high maintenance customer protection relay panels

21. Other influences affecting the evolution of the Maintenance Program • Replacement of older high maintenance customer protection relay panels – With lower maintenance, higher reliability microprocessor relays

22. Other influences affecting the evolution of the Maintenance Program • Replacement of older high maintenance customer protection relay panels – With lower maintenance, higher reliability microprocessor relays • Replacement of older high maintenance air insulated breakers

23. Other influences affecting the evolution of the Maintenance Program • Replacement of older high maintenance customer protection relay panels – With lower maintenance, higher reliability microprocessor relays • Replacement of older high maintenance air insulated breakers – With lower maintenance, higher reliability, dead-front, solid dielectric breakers.

24. Other influences affecting the evolution of the Maintenance Program • Replacement of older high maintenance customer protection relay panels – With lower maintenance, higher reliability microprocessor relays • Replacement of older high maintenance air insulated breakers – With lower maintenance, higher reliability, dead-front, solid dielectric breakers. • Sometimes improving reliability means adding to the maintenance program – like the addition of UPS and their associated batteries.

25. All the data is compiled in the SAP system • Service type • Equipment type • Inspection or test • Frequency required • Age • Environment • Influences Resulting in a fixed priority maintenance schedule that initiates an order to be executed by field technicians

26. Major Underground field technicians receive the orders via their truck docked Mobile Data system. • The order is reviewed and executed

27. The field technicians execute the order - The inspection process, load / voltage, infrared, etc. or testing process is performed - Results are recorded and stored in SAP for future analysis.

28. Future Objectives • Make Work Center historical maintenance data accessible over Mobile Data to field technicians to assist with maintenance and also trouble analysis • Create a Dynamic Scheduling System that could incorporate remote monitoring information, field maintenance data, along with other influences to establish custom maintenance plans for all Customer Services • Objective hurdles are mostly incurred due to software restrictions

29. Questions ?