Entergy Transmission Asset Preservation Department 2004 Objectives

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Entergy TransmissionAsset Preservation
Department2004 Objectives

• Entergy Transmission Planning Summit
• New Orleans, LA
• July 10, 2003

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Asset PreservationTransmission 2004 Objectives

• Improve Transmission System Reliability
• Reduce Transmission System Average Interruption
  Frequency Index (TSAIFI)
• Reduce Transmission System Average Interruption
  Duration Index (TSAIDI)

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Main SubstationTransmission Outage Causes

• Switches
• Breakers
• Relay Misoperations
• Arresters
• Potential Current Transformers

Substation-Related Outages by Cause (System)
4
Substation Equipment Age

• Description Qty.
• Transmission Transformer (270)
• Average age 28 years
• Description Qty. Qty.
• H V Circuit Breaker Oil (1700) Gas
  (780)
• Average age 32years 12years

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Improve System ReliabilitySubstation Equipment
Maintenance

• Transformer Maintenance
• Dissolve Gas Analysis every year
• TTR (Turn to Turn Ratio) every 4 years
• Doble Test and Meggar Test every 4 years
• Load Tap Changer inspection every 2 years

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Improve System ReliabilitySubstation Equipment
Maintenance

• Circuit Breaker Maintenance
• Speed test and External Inspection every 5 years
• Oil dielectric test every year
• Power factor bushings every 10 years
• Test SF6 moisture for Gas Circuit Breakers every
  5 years
• Substation Inspections
• Visual inspection every month (Infrared,
  coronascope, SF6 Gas detection camera,
  ultrasonic detector)
• Relay Maintenance
• DC Operational Test Panel Inspection every 4
  years
• Relay Calibration every 4 years

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Reduce TSAIFI and TSAIDISubstation Outage
Reduction Programs

• Circuit Switch Replacement
• replace damaged components
• Arrester Replacement
• replace silicon carbide arresters with MOVs
• Breaker Replacement
• replace aged breakers that are obsolete
• Breaker Additions
• install breakers in strategic substations to
  isolate the majority of customers from outages
  and reduce the length of the outage
• Automatic Sectionalizing
• Add motor operated switches allowing remote
  sectionalizing
• reducing outage times

8
Reduce TSAIFI and TSAIDISubstation Outage
Reduction Programs

• RTU Retrofits
• Install new RTUs in stations without one,
  reducing outage duration
• Replace obsolete equipment on a priority basis,
  reducing outages and outage duration
• Pin and Cap Replacement
• replace pin cap insulators with new station
  post insulators
• Circuit Switcher Replacement
• replace damaged components and aged equipment
• Transformer Life Extension
• Re-blocking and Re-gasketting
• (Depends on age, manufacturer, size, paper and
  clamping type of the unit)

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Main Transmission Line Outage Causes

• Lightning
• Line Material Failure
• Vegetation
• Storms
• Contamination

10
Transmission Line Miles
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Transmission Line Age
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Improve System ReliabilityT-lines Maintenance
cycles

• Climbing inspection
• 8 Year cycle
• Aerial patrol
• System is flown 2 times per year
• Vegetation
• Urban tree trimming 3 Year cycle
• Mowing 2-5 Year cycle
• Herbicide 4-5 Year cycle
• Side trimming of ROW 9 Year cycle
• Osmose - Ground line inspection
• North Louisiana and Arkansas 12 Year cycle
• Mississippi and Texas 10 Year cycle
• South Louisiana 8 Year cycle

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Reduce TSAIFI and TSAIDIT-Line Outage Reduction
Programs

• Wood pole replacement
• replace wood pole with concrete
• Shield wire replacement
• replace age and corroded shield wire
• Hazard tree removal
• target trees off of the right-of-way that pose a
  threat
• 69 KV line outage reduction program
• Crossarm and insulator removal
• Replacement with polymer post insulators
• Replace bonding and grounding

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Transmission System Metrics
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Transmission System Metrics
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Transmission System Metrics