7/27/2019 Completionof220kVProjectinQatar(JPS).pdf

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May 19, 2009S. Mashio, T. Shimizu, K. Kumagawa, M. Doi

Completion of220 kV XLPE cable project in Qatar

JTD23-X2410

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Outline of Project

• Power Utility(KAHRAMAA) developed

7th and 8th power line projectswith 220kV and 400kV XLPE cables

in the vicinity Doha City.

• Two circuit 220kV line constructionstarted in 2007.

• J-Power Systems (JPS) supplied one circuit 220kV Lineand it was recently commissioned in April 2009.

• 400kV line is under construction by JPS andplaned to be commissioned in May 2010.

Umm Al Amad

Super 

 Al Wajbah

Super 

 Al Waab Super 

400kV XLPE

2 cct x 22km(JPS supply 1cct)

LDS 2

220kV XLPE

2 cct x 12km

(JPS supply 1 cct)

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Features

Heavy Duty and High Transmission Capacity Design

 Transmission Capacity : 515MVA (1352 A/cable,100% load)

 Cable Type : 2500mm2(4934KCM) Lead Sheathed Cable

( against saline contamination in soil )

 Route Length: 7.5miles (12km)

 Premold Joints: 66 (w/ copper sleeve in FRP box)

 Section length :1600ft (500m) (32 tons/reel）

 Installed in Trench (Major section is direct burial)

Special concern about soil dry out:

 DTS monitoring system provided for entire route.

FEM thermal analysis for optimum duct bank design.

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FEM analysis in plural soil condition

Bedrock (0.7Km/W)

Normal soil in over layer was assumed dry out ( 2.7K.m/W) whilst

Bedrock was 0.7Km/W. Due to difficulty of cutting trench and

procurement of backfill, trench width was optimized by FEM analysis

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JPS has supplied more than 1500pcs of 220kV premolded joints.

Though premolded joint can be tested in factory, previous

experiences showed vital importance of jointing work.

Jointing Work

[ System approach by JPS ]

 Qualification & training for joint team

 Keeping clean & low humidity circumstances

 Process control of jointing work by engineer 

[ Final verification in commissioning test]

  AC high voltage test for entire length PD measurement at each Joint with PD sensor 

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 AC High Voltage Test (IEC 62067) Test Voltage AC 180kV (1.4Uo)

for 1 hour 

 Route Length : 7.5 Miles (12km)  Resonant Frequency : 25 Hz

 AC High Voltage Test

Frequency Resonant AC Transformer

7/27/2019 Completionof220kVProjectinQatar(JPS).pdf

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Termination

Insulating Jointwith Coffin Box

220kV XLPECable

Coaxial Cable

Portable PDmeasurement

device

 Test Voltage : Uo

  Nos. of Joint : 66 (22JB)

Test voltage was raised to 1.4Uofor 10sec, then gradually

decreased to Uo considering

PD inception voltage ratio.

PD Measurement

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Thank you for your attention