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Nov 01, 2014

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REPBLICA DE CABO VERDE Power Transmission and Distribution System Development Project in six Island of Cape Verde

Lot 1 Rehabilitation, Reinforcement and Expansion of MV and LV Networks in Santiago, Fogo and Maio IslandsBidding Documents Volume III Section VI. Technical Specifications and Drawings LOT1

PTDSD Project: Part I - Rehabilitation, Reinforcement and Expansion of MV and LV Networks LOT1 and LOT2

Vol III, lot 1 Technical Specification and Drawings

General Requirements Scope of Supply

Section VI. Technical Specifications and Drawings

Table of Contents

Scope of work ................................................... 71. 1.1. 1.2. 1.3. 2. 2.1. 2.2.2.2.1. 2.2.2. 2.2.3. 2.2.4. 2.2.5.

INTRODUCTION ................................................................................................................... 7 SANTIAGO ISLAND SCOPE ............................................................................................. 7 FOGO ISLAND SCOPE ................................................................................................... 10 MAIO ISLAND SCOPE ................................................................................................... 13 UNDERGROUND MV NETWORK SPECIFICATIONS ................................................... 15 SPECIFICATION OF MV CABLES ................................................................................ 15 MV CABLES AND COMMUNICATION NETWORKSUPPLY .................................... 18MV cables with a cross section of 500 mm2 ......................................................................................18 MV cables with a cross section of 240 mm2 ......................................................................................18 MV cables with a cross section of 120 mm2 ......................................................................................20 MV cables with a cross section of 70 mm2 ........................................................................................21 Communication Network ..................................................................................................................22

Page 2 of 150

PTDSD Project: Part I - Rehabilitation, Reinforcement and Expansion of MV and LV Networks LOT1 and LOT2

Vol III, lot 1 Technical Specification and Drawings

2.3.2.3.1.

MV CABLES TRENCH .................................................................................................... 24TRENCH WORKS ................................................................................................................................30

2.4. 2.5. 3.

CABLE ACCESSORIES ................................................................................................... 34 PLASTIC PROTECTION ................................................................................................ 35 DISTRIBUTION STATIONS, SWITCHING STATIONS AND SECONDARY

SUBSTATIONS ............................................................................................................................ 35 3.1.3.1.1. 3.1.2. 3.1.3. 3.1.4. 3.1.5. 3.1.6. 3.1.7.

PALMAREJO 20 KV SUBSTATION ............................................................................. 35General .............................................................................................................................................35 Specifications of the new 20 kV switchgear .......................................................................................37 MV/LV transformers .........................................................................................................................47 MV/LV transformers .........................................................................................................................48 AC and DC Auxiliary Voltages ............................................................................................................48 Earthing system.................................................................................................................................49 Civil works .........................................................................................................................................50

3.2.3.2.1. 3.2.2. 3.2.3. 3.2.4. 3.2.5.

GAMBOA 20 KV SUBSTATION ................................................................................... 52General .............................................................................................................................................52 Specifications of the new 20 kV switchgear .......................................................................................52 Earthing system.................................................................................................................................62 Power cable and control cable arrangement .....................................................................................62 Civil works .........................................................................................................................................62

3.3.

SWITCHING STATIONS ............................................................................................... 63Page 3 of 150

PTDSD Project: Part I - Rehabilitation, Reinforcement and Expansion of MV and LV Networks LOT1 and LOT2

Vol III, lot 1 Technical Specification and Drawings

3.3.1. 3.3.2. 3.3.3. 3.3.4. 3.3.5. 3.3.6. 3.3.7. 3.3.8. 3.3.9. 3.3.10. 3.3.11.

General .............................................................................................................................................63 Existing MV switchgear .....................................................................................................................66 The MV cubicle to supply and install .................................................................................................66 MV/LV Power Distribution Transformers ..........................................................................................72 LV distribution Fuse Boards ...............................................................................................................73 AC Panel Board..................................................................................................................................73 Rectifier / Battery / DC Switchboard .................................................................................................74 Lighting and Small Power ..................................................................................................................75 Earthing System ................................................................................................................................75 Safety Equipment .........................................................................................................................77 Civil Works....................................................................................................................................77

3.4.3.4.1. 3.4.2. 3.4.3. 3.4.4. 3.4.5. 3.4.6. 3.4.7. 3.4.8. 3.4.9.

MV/LV SECONDARY SUBSTATIONS ......................................................................... 78General .............................................................................................................................................80 MV Switchgear Specification .............................................................................................................81 Directional Fault Current Indicator for Uderground Network ............................................................84 MV/LV Power Distribution Transformer............................................................................................86 Transformer feeders..........................................................................................................................87 Low voltage distribution fuse board ..................................................................................................88 Civil Works ........................................................................................................................................94 Earthing Systems ...............................................................................................................................96 Accessories........................................................................................................................................98

Page 4 of 150

PTDSD Project: Part I - Rehabilitation, Reinforcement and Expansion of MV and LV Networks LOT1 and LOT2

Vol III, lot 1 Technical Specification and Drawings

4. 4.1. 4.2. 4.3.4.3.1. 4.3.2. 4.3.3. 4.3.4. 4.3.5. 4.3.6. 4.3.7. 4.3.8. 4.3.9.

MV OVERHEAD NETWORK............................................................................................. 98 GENERAL ........................................................................................................................ 98 SCOPE OF WORK......................................................................................................... 100 EQUIPMENT SPECIFICATION .................................................................................. 104Supporting structures - Poles ..........................................................................................................104 Cross arms.......................................................................................................................................106 Insulators ........................................................................................................................................107 Aerial Conductor Cables .............................................................................................