APPLICATION ORIENTED DESIGN OF CABLES Mrs. Rohini Bhattacharyya, - PowerPoint PPT Presentation

APPLICATION ORIENTED DESIGN OF CABLES Mrs. Rohini Bhattacharyya, Dubai cables Ltd. Mr. Nawaf Al Mohaideb, Dubai cables Ltd.

Product Range High Voltage Medium Voltage Low Voltage Fire Resistant Building Wire Control and Auxiliary Cable Accessories Cu Wire & Conductor I nstrumentation and Pilot Cables

Abstract  Design based on GCC region utility requirements  Present 3 core, 5 types of MV XLPE (11kV) cable designs operating at 90 ° C  Demonstrate gains and drawbacks of each one .

Type 1-Standard Cable Copper tape screen and armour together withstands short circuit of 23.21 kA/1sec. • Non water tight construction • Tolerates mechanical stresses PVC outer sheath provides fire retardant property •

Type 2-Radially and longitudinally water tight cable • Copper tape and armour together withstands short circuit of 25.14 kA/1sec. • Problematic installation due to high diameter • Radial & longitudinal water tight at each core • Tolerates mechanical stresses • PVC bedding and PE sheathing not recommended

Type 3-Water tight at conductor level with interstitial copper conductor • Copper tape screen withstands short circuit of 21.84 kA/1sec. • longitudinal water tight only at each core • high cost • Steel tape armour is weak • PE sheath provides addition mechanical protection

Type 4-Lead sheathed Radial and longitudinal water tight cable • Short circuit of lead is 18.74 kA/1sec., and increases by more thickness. • longitudinal & radial water tight • Relatively low in cost • Mechanically weak • Special installation due to heavy weight

Type 5-Without Individual Screen, Non water tight cable • Armour short circuit of 18.64 kA/1sec. No water tight • • Lowest in copper content • Mechanically tough • Least in dimension and weight

Comparing – Current Rating 700 700 700 700 700 600 600 600 600 600 588 588 588 588 588 572 572 572 572 572 561 561 561 561 561 550 550 550 550 550 531 531 531 531 531 500 500 500 500 500 495 495 495 495 495 477 477 477 477 477 471 471 471 471 471 466 466 466 466 466 454 454 454 454 454 400 400 400 400 400 Amps Amps Amps Amps Amps In ground In ground In ground In ground In ground 300 300 300 300 300 In air In air In air In air In air 200 200 200 200 200 100 100 100 100 100 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 6 6 6 6 6 Design type Design type Design type Design type Design type

Comparing – Physical Dimensions Physical dimension of cables 95 25 93 90 20 19,6 17 85 15 15 Weight in MT/km 14,6 14,4 82 82 80 10 Diameter in mm 79 78 75 5 70 0 Design 1 Design 2 Design 3 Design 4 Design 5

Conclusion Characteristics Design 1 Design 2 Design 3 Design 4 Design 5 Standard Individual core Separate Earth Individual core Armour as Armoured, PVC WT conductors Lead sheath/PE Earth return sheathed PVC/SWA/PE PE/STA/PE /PVC Continuous electrical load G G G E G Short Circuit load E E F G E Bending properties G F G P E (flexing property) Anti Termite and Rodent, G E E E G Reduced water diffusion, higher abrasion resistance and increased toughness. Water Resistant F E G E F Joint and Accessories Standard Special Special Standard Standard E – Excellent ;G – Good; F-Fair ; P- Poor

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