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Entergy Transmission

Asset Preservation Department

2004 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)

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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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• 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

Improve System ReliabilitySubstation Equipment Maintenance

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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 sectionalizingreducing outage times

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•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)

Reduce TSAIFI and TSAIDISubstation Outage Reduction Programs

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Main Transmission Line Outage Causes

• Lightning• Line Material

Failure• Vegetation• Storms• Contamination

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Transmission Line MilesTransmission

Lines 69KV Miles

115KV Miles

138KV Miles

161KV Miles

230KV Miles

345KV Miles

500KV Miles

Total

Mississippi 0 1924 0 6 498 0 355 2783 Arksnsas 12 2021 0 1556 257 44 870 4760

North Louisiana 50 970 0 0 118 24 193 1355 South Louisiana 952 730 631 0 996 86 423 3818

Texas 656 0 1246 0 319 38 48 2307 Total 1670 5645 1877 1562 2188 192 1889 15023

Structure Material

Wood 76%

Hybrid0%

Steel12%

Concrete12%

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Transmission Line AgeTransmission

Lines0-10

Years10-20Years

20-30Years

30-40Years

40-50Years

50+Years

AP&L 596 875 1403 1237 933 212LP&L,NOPSI 224 141 986 537 232 327

MP&L 327 475 474 765 257 232GSU 199 983 1993 1261 271 83Total 1346 2474 4856 3800 1693 854

0-10Years

10-20Years

20-30Years

30-40Years

40-50Years

50+Years

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

GSU

MP&L

LP&L,NOPSI

AP&L

Entergy System

0-10 Years9%

10-20 Years16%

20-30 Years33%

30-40 Years25%

40-50 Years11%

50+ Years6%

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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 MetricsTransmission SAIFI

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

Arkansas Louisiana Mississippi New Orleans Texas System

2000

2001

2002

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Transmission System MetricsTransmission SAIDI

0

5

10

15

20

25

30

35

40

45

Arkansas Louisiana Mississippi New Orleans Texas System

2000

2001

2002

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Transmission System MetricsTransmission Service Index

0

200

400

600

800

1000

1200

1400

1600

2000 2001 2002