1 10% worst performing circuits reliability program swede conference san antonio, tx may 10, 2007...
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1
10% Worst Performing CircuitsReliability Program
SWEDE ConferenceSan Antonio, TX
May 10, 2007
Kenton M. Brannan, P.E.kenton.brannan@centerpointenergy.com
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10% Circuit Reliability Program
• Historical Approach
• Enhanced Process– Identification of Probable 10% Circuits– Circuit Evaluation & Improvements– Reliability Oversight Committee– Documentation Procedure
• Tree Trim Process
• Notable Changes
• Process Assessment
• Anticipated Process Enhancements
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Historical Approach
• 10% Circuit Standard– Performance measured from Jan 1 to Dec 31
– Prefer to have improvements made by Jan 1
• CNP’s Historical Approach– Circuit reviews began in 4th Quarter
– Infrared and Tree Trim processes separate from 10% circuit review
– No specific deadlines to complete action plans
– Differing methods among service centers
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Enhanced Process
• Identification of Probable 10% Circuits– Begins upon conclusion of 2nd Quarter with June
YTD circuit performance data
– Data available for analysis by mid-July
– Begin with top 30 circuits from SAIDI/SAIFI lists
– Confidence level: ≈ 25% of top 10 % circuits
– ≈ 15 circuits are added each month until year end
– Final 10% circuits (≈ 40) are identified by mid-January from year end data
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Enhanced Process
• Circuit Evaluation & Improvements – 90 Days– 90 day timeframe begins on date of identification
as probable 10% circuit
– 1st 45 days
• Perform root cause analysis and develop action plan to improve circuit performance
• Attempt to achieve “Reduce-To” values
– 2nd 45 days
• Complete field work called for in action plan
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Enhanced Process
• Reliability Oversight Committee– Consists of engineering and operations personnel
– Evaluates proposed action plans (within 1st 45 days)
• Documentation Procedure– Progress tracked via MS SharePoint
– Reports• Circuit Level Summary Report• System Reliability Dashboards
Circuit Level Summary Report
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Tree Trim Process
• Focus – 10% Circuits – 4th quarter of the previous year and
1st quarter of the new year– All Circuits – 2nd and 3rd quarters
• 4th quarter Selection Criteria– Information on probable 10% circuits– Outage data due to vegetation & wind– time since last trim– Emphasis on 10% circuits with highest priority
given to repeat and 300% circuits
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Timeline
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Notable Changes
• Timeframe– Begin closely analyzing probable 10% circuits in July
rather than October or November
• Infrared Process– Increase current inspection cycle from 3 years to 5– 5 year system focus (≈ 300 circuits/year)– Additional focus on 10% circuits (≈ 200 circuits)
• Tree Trim– New process has been enhanced to incorporate the 10%
circuits in the proactive tree trimming strategy
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Process Assessment
• Root cause analysis & circuit work is being completed earlier in the year as compared to past years
• Reliability Oversight Committee– Identifying synergies
– Sharing of resources occurring
• Process very effective thus far
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Anticipated Process Enhancements
• Identify probable 300% circuits before 2nd Q ends
• Refine target SAIDI and SAIFI values using historical values and statistical methods
• Abandon MS SharePoint and move to SAP/Business Warehouse
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