TABLE OF CONTENTS 1 GENERAL PROJECT DESCRIPTION Introduction Scope of Construction Work Post Construction Period...

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1 TABLE OF CONTENTS 1 GENERAL PROJECT DESCRIPTION Introduction Scope of Construction Work Post Construction Period General Conditions DESIGN CRITERIA Design standards and specifications Reliability level Climatic Conditions Climatic Data Wind Pressures ENVIRONMENTAL WORKS kv TRANSMISSION LINE DETAILS General Project Main Parameters General project parameters External clearance Phase Conductors and Earthwire Conductor Earth wires (OPGW) Anti-vibration of conductor and OPGW Stringing program and procedure Insulator strings and fittings Insulator strings Main fittings selection Tests Tower earthing Adopted data of the earthing system Soil Resistivity Earthing system resistance test J D-RPT-EL-01 REV 0 Page i of iv

2 4.8 Line Route Line route description Line Route Angle Points Coordinates Topography condition Line Survey and Profiling Line route survey and clearing Weather loading cases Insulation Coordination Polluted area classification and distribution Lightning protection Minimum distance between conductors Minimum internal clearance requirement Tower Signage Plates Warning Spheres Tower Anti-Climbing devices Steel structure Design standards and specifications Steel structure load cases General rules for tower design Principle and requirements of material for tower Fabrication requirements Tower installation requirements Bolts, Nuts and Washer general specifications Bolt tightening requirements Tower galvanization Connection between foundation and tower Damaged and Misfabricated Members Foundations Design Codes Design Criteria Concrete Materials Reinforcing Steel rebars J D-RPT-EL-01 REV 0 Page ii of iv

3 Admixtures Foundation system Geotechnical Investigation Actions for non-degradation of the environment Transmission Line Inspection, Testing and Commissioning Line Inspection during Construction Testing and commissioning Submittals Witnessing of Factory Acceptance Test (FAT) Training of Employer s Staff On the Job Site Training LIST OF TABLES Table 2-1: Ambient Conditions... 6 Table 4-1: Main Data... 8 Table 4-2: Material Specification... 8 Table 4-3: Tower Types Table 4-4: Vertical Clearances Table 4-5: Fibre Specification Table 4-6: Insulator string types and application Table 4-7: Standard Designed Weather Conditions Table 4-8: Weather Loading Cases Table 4-9: Sag and Tension Conductor & OPGW Table 4-10: Basic requirements for insulation coordination Table 4-11: Design Codes Table 4-12: Steel characteristics Table 4-13: Spacing of Bolts and edge distance Table 4-14: Spring Washers thickness Table 4-15: Bolt Size Table 4-16: Galvanization Tolerances in dimensions and shape Table 4-17: Tentative Steel Piles Length for Each Tower Leg...39 J D-RPT-EL-01 REV 0 Page iii of iv

4 LIST OF FIGURES Figure 1: 66 kv Line Route... 1 Figure 2: Sketch of anti-climbing device J D-RPT-EL-01 REV 0 Page iv of iv

5 1 GENERAL PROJECT DESCRIPTION 1.1 Introduction This tender report defines the main specifications, requirements and quantities of the 66 kv double circuit overhead line that connects the two 66 kv GIS substations at APC Plants and the Intake Pumping Station respectively, in Safi, Jordan. The report and associated advanced concept level drawings should serve as a basis for the bidding Contractor(s) to price their offer for the overhead line and installation of underground cables that connect the two substations. Following the Employer s selection of the successful bidder, the latter shall develop the detailed execution level design accordingly. The Contractor s offer shall be based on a lump-sum price with a turnkey offer that encompasses all works, which are mentioned in this document and/or required for a complete functioning of the system as a whole. The Contractor s offer shall cater for all supply, installation, testing, and commissioning of all required material, as well as all related design activities, geotechnical investigation works, aerial LIDAR and/or land survey investigations. 66kV Cable 500m 66kV Overhead Line 33.4 km APC Plant 66kV Cable-500m Figure 1: 66 kv Line Route The 66 kv connection is approximately 34.4 km long, with 33.4 km overhead line and 1 km underground cable. The underground portions are the final connections into the respective substations, where 500 meters are required for the final connection into 33/66kV step-up substation at APC Plants, and another 500 meters are required for connection into 66/33kV step-down substation at the Intake Pumping Station. 1.2 Scope of Construction Workp The Contractor shall perform the design, engineering, procurement, construction, quality management, insurance, fabrication, factory inspection and testing, transport and delivery J D-RPT-EL-01 REV 0 Page 1 of 65

6 of all material to work-site, shipment, port clearing, storage, installation, erection, site inspection, survey, construction of access roads where necessary, soil investigation, foundations, tower erection, stringing, installation of underground cables and all related accessories including joints, terminations, testing and commissioning, training of Employer s employees, and perform all associated works and services until final handing over of line work in a satisfactory condition to Employer, as specified in this Tender Report. The following activities are included in this Scope of Work: Final line route definition based on aerial LIDAR and/or ground survey investigations, with minimal deviations from the route proposed in the drawings Clearing of Right-of-Way and construction of access/maintenance roads as necessary Performance of detailed aerial LIDAR and/or GPS and Total Station-based ground survey Updating of Plan & Profile and tower spotting Geotechnical investigation and foundation type selection Resistivity measurements at tower location Production of final staking chart, complete of all line components Design, manufacture and supply of all line materials and accessories (i.e. Conductors, Towers, OPGW, Insulators, hardware, etc), with relevant testing and inspection at Manufacturer s factory, insurance, packing for export shipment, transport and delivery of all materials to the work-site Supply and testing of Construction Materials Design and supply of material and installation of foundations Production of final line design based on PLS-CADD and PLS-TOWER software Erection of the lattice steel towers Installation of insulators and associated hardware Installation of conductors and OPGW, including vibration dampers, spacer dampers and other accessories Installation and connection of joint boxes and associated hardware Supply, installation and testing of towers earthing system Design, supply, erection of tower signs and accessories. Installation of directly buried 66 kv underground cables (which will be free issued by the Employer including all accessories such as splice kits, termination kits, joint kits between transmission lines and cables, etc.) from the terminal towers up to the GIS sealing ends at each substation, including cross bonding of cables if required, J D-RPT-EL-01 REV 0 Page 2 of 65

7 as per the requirements and under the supervision of the cable manufacturer. It shall be noted that the power cables are of the Prysmian Airguard types (69kV) and of sizes two single cores 600 kcmil (304mm²) per phase for each circuit. Supply and installation of directly buried fiber optic armored cable [24 fibers], to be installed in the same trench along with the 66 kv power cables, from final splicing box at the terminal towers to the control room at either substation, including making connections with the OPGW at the terminal tower and in the termination box in the control room. Approval of all concerned authorities, including civil aviation, etc. Testing, commissioning, and energization Demobilization, reinstatement, and cleanup Supply and deliveries of spare materials Delivery of as built drawings and electronic records The construction services period is eighteen months. 1.3 Post Construction Period The Contractor is to guarantee the efficient and good working of the Transmission line and Underground cables section for a period of one year from the date on which the Employer takes over the Transmission line. In parallel, The Contractor shall attend to all anomalies and/or defects that arise following the commissioning of the line. 1.4 General Conditions a. The Employer will give access to each bidder to reach the project site(s) of interest for site visits before submission of the bid(s). Bidders are required to visit the site to assess the site conditions in the preparation of their bid. The site visit will be undertaken at the bidder s expense. b. The estimated quantities of steel lattice towers, foundations, conductors, insulators, various line materials and other items are given in the relevant Price Schedule. However, the final quantities and construction requirements to be executed by the Contractor shall be as per the scope of work, project requirements, and construction drawings to be prepared by successful bidder and approved by the Employer and Engineer, and in line with the technical specifications, and without alteration to the total contract price. J D-RPT-EL-01 REV 0 Page 3 of 65

8 c. The various items of work as described in the relevant Price Schedule shall be read in conjunction with the corresponding sections in the Technical Specifications including amendments and, additions, if any. The Bidder s rates shall be based on the description of activities in the Price Schedule as well as necessary operations detailed in these Technical Specifications. d. The unit rate quoted shall be inclusive of all plant equipment, insurance, material, skilled and unskilled labor and any other cost or item essential for satisfactory completion of the works. e. Works shown in the drawings but not mentioned or described in the Specification or vice-versa, and necessary for the completion of the works as a whole, shall be included in this Contract and its execution shall be covered by the Contract Price. f. All materials shall comply with the Project Specifications and the corresponding International Standards. The Contractor s Suppliers shall not commence any fabrication before approval of material submittals, drawings and relevant type tests, the latter for same or similar product. g. During the performance of the work on the right-of-way, the Contractor shall: i. Confine all activities to the area within the boundaries of the right-of-way ii. Repair any damage caused by himself or any of his subcontractors at his own cost to property outside the Right-of-Way including buildings, roads, drainage systems and fences. h. Safety and security of all works as defined in the contract is the responsibility of the contractor until final taking over. The Contractor should maintain security checks and surveillance in all areas where work is being carried out and in all areas where Plant and Contractor s Equipment is stored and around all living quarters, offices and stores. Contractor shall insure compliance with his own Environmental and Social Management Plan. i. During the Defects Liability period, the Contractor shall make such arrangements as to ensure the attendance on the Site, within a time period of three (3) days of his being called upon to do so, of competent representatives for the purpose of carrying out any work of maintenance for which the Contractor shall be liable and during such part or parts of the said period as the Employer shall deem it necessary. J D-RPT-EL-01 REV 0 Page 4 of 65

9 2 DESIGN CRITERIA 2.1 Design standards and specifications The transmission line shall be designed and executed in accordance with the specific and general requirements mentioned below. In addition, the Contractor shall perform the geotechnical, soil resistivity, and topographic works and studies for the route. The 66 kv overhead line should be designed and constructed considering the following standards/specifications as follows: 1. This document itself, 2. BS EN : Overhead electrical lines exceeding AC 1kV: Part 2-9: National Normative Aspects (NNA) for Great Britain and Northern Ireland. 3. BS EN : Overhead electrical lines exceeding AC 1kV-Part 1: General requirements 4. ACI 318 M-08: American Concrete Institute for the design of reinforced concrete structures. 5. EN 1997: Geotechnical Design 6. IBC 2009 : Seismic design 7. ANSI/ICEA S : Standard for Extruded Insulation Power Cables rated above 46 through 345 kv In regards to Item 7, as the underground power cables will be free issued by the Employer and installed by the Contractor, Contractor shall specifically comply with Appendix 2 Handling and Installation Parameters and/or any other installation or testing requirements required by the manufacturer. 2.2 Reliability level Reliability level 3 is considered, i.e. loadings with 500 year return period. The Partial factors are defined in BS EN standard. 2.3 Climatic Conditions The project is located in Jordan with a climate characterized as very hot and wind is characterized as strong. The following climate data will form the design data for the working conditions of the equipment and line components. J D-RPT-EL-01 REV 0 Page 5 of 65

10 2.3.1 Climatic Data Table 2-1: Ambient Conditions Ambient conditions Description Unit Data Maximum ambient temperature C 50 Solar radiation W/m2 1,000 Minimum ambient temperature C 5 Annual average temperature C 30 Average relative humidity % Maximum humidity % 85 Snow mm N/A Wind Speed (3 seconds peak gust at 10 m) m/s 37 Maximum considered earthquake response accelerations Percentage of g (gravity) S s: S 1: Occupancy importance: Wind Pressures The maximum gust wind at 10 m above ground is V g= 37 m/s In calculating maximum wind pressures, wind loads will be subject to factored loads according to EN :2017 and EN Calculation of wind pressure on Conductors, OPGW and Insulators should be determined by the equation mentioned below: The mean wind pressure, q h (h), in N/m 2 at the reference height above ground h is determined using: q h (h) = ½ ρ {37 x γ v x K r x ln (h/z 0)} 2 x C dir x C 0 x Gc x Cc Where, ρ is the air density in kg/m3, which depends on the altitude, temperature and barometric pressure to be expected in the region during windstorms and is equal to 1,226 kg/m3 as per EN :2017. Partial factor (γ v), considered for reliability level 3, is 1.2 as per EN :2017. Maximum Gust wind is 37 m/s J D-RPT-EL-01 REV 0 Page 6 of 65

11 Terrain factor (K r) is and Roughness length (Z 0 ) is 0.01, Considering Terrain Category I as per EN , Table 4.1. h: is the mean height of the conductor attachment points as per EN : Wind directional factor (C dir) is 1.0 The orography factor (C 0 ) is 1.0 Structural factor for the conductor (also termed span factor), Gc 0.71 as per EN , Table 4.4.b Drag Factor (C c) is 0.9 The calculated dynamic wind pressure on overhead conductor is 1331 Pa considering (h) of 23.8 m and on OPGW is 1418 Pa considering (h) of 30.6 m. 3 ENVIRONMENTAL WORKS The 66 kv line is passing through unoccupied land and not resulting in any resettlement plans or the impacts. In addition, the route of the line is so chosen so as to avoid all ponds, streams, and other obstructions. Contractor is to insure that the final Right of Way maintains the above constraints and verify that indeed no mitigation measures are required. The Employer will carry out environmental impact study for the project if requested by the related governmental entity. Based on the above, the Contractor should produce an Environmental Management Program, EMP. The EMP aims at the implementation of mitigation measures of environmental impacts if any. In addition, it identifies the main sources of impact related to the construction and their associated mitigation measures. Once the EMP is approved by the Employer and/or relevant authorities, the Contractor may obtain the permit and start the works. The mitigation measures are intended to optimize on safety and health related matters, specifically on the short term for the safety of the workers and construction staff, noting that the long term are not major given the absence of public in the area of concern. As an example, safety mitigation measures include enforcement of personal protective equipment for the workers, and/or discharging of disposals in a proper manner. Premitigation measures include adjustment of the line ROW such that it is as far away from residences as possible, preferably facing the back rather than the front sides of buildings, etc. The EMP should also include a section on Building capacity, which is related to coaching the workers of safety measures, and insuring that they are all the time compliant with the safety instructions (wearing hard hats, special clothing, etc.). J D-RPT-EL-01 REV 0 Page 7 of 65

12 4 66 KV TRANSMISSION LINE DETAILS 4.1 General The 33.4 km double circuit 66 kv transmission line will comprise seven types of steel lattice, self-supporting towers, equipped with single conductor per phase for each circuit, and a single OPGW wire. 4.2 Project Main Parameters General project parameters The below Tables describes the general project s parameters Table 4-1: Main Data Main Data Description Unit Data Line length: km 34.4 a. Overhead section km 33.4 b. Underground section 1 - APC Plant km 0.5 c. Underground section 2 - Intake Pumping Station km 0.5 Line Right of Way m 45 System voltage kv 66 System highest voltage kv 72.5 System frequency Hz 50 Power Capacity needed per circuit MVA 70 Number of circuits per tower No. 2 Phase Arrangement Vertical No. of Conductors per phase No. 1 Number of overhead OPGW Earthwire No. 1 Table 4-2: Material Specification Material Specifications Description Unit Data Conductor: - AAAC 479-AL3 YEW Diameter mm 28.4 Cross sectional area mm Conductor weight kg/km Rated strength kn Conductor Current Carrying Capacity (at A 695 ambient temperature=50 C, conductor temperature=80 Cand Solar radiation= 1000 W/m 2 ) Power Capacity MVA 79 J D-RPT-EL-01 REV 0 Page 8 of 65

13 OPGW: Optical ground wires for use in high corrosion sites No. of Fibers 24 OPGW Material Fibers tube material Aluminum Alloy and Aluminum clad steel wires Aluminum Diameter mm 13.4 Cross sectional area mm Rated Tensile Strength kn 54 Short circuit withstand ka 2 sec 81 Short circuit level at the 66kV switchgear in the 33/66kV step up substation at APC plants (in case of parallel operation of the step up transformers) Grease for OPGW Repeaters Suspension and Tension Insulator types: ka 7.2 Required Not required Silicone rubber Polymer Minimum insulation creepage distance mm/kv 38 Insulator String types Conductor & OPGW safety factor at Maximum wind at Initial Condition Conductor Tension limit at EDS Final Condition (T=30 deg.) OPGW Tension limit at EDS Final Condition (T=30 deg.) Sag ratio between OPGW to Conductor at EDS condition Suspension tower: Vertical I single/double insulator Tension and Terminal towers: Tension Double insulator string; Jumper Single insulator string % of RTS (Rated Tensile Strength) - 19% of RTS - 18% of RTS < 90% Earthing: Max tower earth resistance Ohms 10 Lightning protection shielding angle deg. 30 J D-RPT-EL-01 REV 0 Page 9 of 65

14 Table 4-3: Tower Types Tower types Tower Name Type Wind Span (m) Weight Span (m) Angle (deg.) Tower Nominal Heights (m) S1 Suspension , 18 and 21 T3 Tension , 18 and 21 T6 Tension , 18 and 21 T9 Tension , 18 and 21 TR Terminal TAD TDI Terminal/ Overhead to Underground Special Tension For towers schematic drawing, refer to Drawing No. J D-TD-E-LT-19 All towers shall be lattice steel, self-supporting towers, double circuit, single conductor per phase Tower Phase Arrangement is vertical (Double circuit) Tower Nominal Heights is the height of the lowest tower arm External clearance The minimum required clearances to other obstacles are shown in the below tables: Table 4-4: Vertical Clearances Vertical clearances for tower spotting Description Clearance 66 kv (m) Normal ground not accessible to vehicles 6 Roads and Highways 10 Buildings 5 Trees 3 Antenna, street lamps, flag poles, advertising signs and similar structures 3 Power lines (above or below) 3 J D-RPT-EL-01 REV 0 Page 10 of 65

15 The vertical clearances of conductor to ground or obstacles are checked at 85 o C maximum conductor temperature and after conductor creep and are based on a 5m high vehicle. The minimum required horizontal clearance between the edge of the 66 kv line (conductors) and the edge of the existing 33 kv lines (conductors) shall be 15m. 4.3 Phase Conductors and Earthwire Conductor Selection of Conductor The AAAC conductor is required due to its superior corrosion withstand characteristics which are of paramount importance in the project area. AAAC 479-AL3 YEW is selected to meet the required power transfer capacity with better corrosion resistant properties Conductor stresses The line design shall be such that the maximum permissible tensile load on conductors does not exceed 50% RTS (Rated Tensile Strength) at maximum loading condition (i.e. at maximum wind and T=15 o C at initial condition). The tension of the conductor should not be more than 19% of RTS (Rated Tensile Strength) for EDS final condition (i.e. T=30 C at final condition) Tests Complete conductor design and tests shall confirm to BSEN 50182: Conductors for overhead lines -Round wire concentric lay stranded conductors. Aluminum wires tests should be based on BSEN 50183: Conductors for overhead lines- Aluminum-Magnesium-Silicon alloy wires Type test certificate may be accepted, provided that tested conductor corresponds to the offered one. The Sag-Tension calculation conductor shall be carried out by using PLS CADD software Earth wires (OPGW) Selection of OPGW One OPGW is specified for this 66 kv line, having 24 fibers. The OPGW will be used for both communication between substations as well as for protection against lightning strikes. The physical properties are as described in below table. J D-RPT-EL-01 REV 0 Page 11 of 65

16 Table 4-5: Fibre Specification Description Number of fibers Specification 24 fibers Optical fiber Similar to Prysmian PureCore OPGW Cat. No. 34D43 (7772) Attenuation of the Fibers G nm Less than 0.4 db/km 1550 nm Less than 0.23 db/km Tests The design and tests of OPGW and fibers shall be performed as per the following group of codes IEC and IEC standards, the Guidelines of IEEE 1138, ITU-T G 652, IEC 60304, EN and EN For Aluminum clad steel wires, the design and test should be according to ASTM B-416 and IEC The Sag-Tension calculation conductor shall be carried out by using PLS-CADD software. Each supplied OPGW drum shall be tested before installation to prove that its parameters are in accordance with those guaranteed by the manufacturer. If the tests prove otherwise and the measured parameters are not within the guaranteed range, then the Contractor should replace the faulty drum OPGW safety factors The line design shall be such that the maximum permissible tensile load on OPGW/Earth wires does not exceed 50% RTS (Rated Tensile Strength) at maximum loading condition (i.e. at maximum wind and T=15 o C at initial condition). The tension of the conductor should not be more than 18% of RTS (Rated Tensile Strength) for EDS final condition (i.e. T=30 C at final condition). In addition, the sag ratio between the Earth wires (OPGW) and the conductor should be less than 90% at EDS condition. 4.4 Anti-vibration of conductor and OPGW To protect the conductors, Stockbridge vibration dampers should be installed on the AAAC YEW conductors according to approved calculations as well as conductor and/or damper manufacturer s requirements where the number and type of vibration dampers will be as J D-RPT-EL-01 REV 0 Page 12 of 65

17 per the approved calculations and the conductor s or vibration dampers manufacturer recommendations. For Ground wire (OPGW), Stockbridge vibration dampers should be provided according to approved calculations as well as conductor and/or damper manufacturer s requirements where the number and type of vibration dampers will be as per the approved calculations and the conductor s or vibration dampers manufacturer recommendations. The Contractor shall guarantee, by means of corresponding calculations i.e. Damping Efficiencies Studies confirming that the bending stress of the conductor and OPGW, protected by Stockbridge dampers, will be restricted to acceptable limits set by conductor s manufacturers, for all frequencies and considering that lifetime of the conductors and OPGWs is at least 50 years. The calculations shall cover the range of wind velocities inducing Aeolian vibrations and associated vibration frequencies, for typical conductor and OPGW tensions and for the range of span lengths, as appropriate. All data for the calculations shall be performed under the responsibility of the Contractor and shall be subject for approval of the Employer. Vibration dampers of Stockbridge type shall be installed at conductor suspension and tension points and at OPGW suspension and tension points. 4.5 Stringing program and procedure Two months before starting, the Contractor shall submit, for the Employer s approval, the stringing procedure including the following information: Sag/tension Tables for Conductors and OPGW Brake and winch locations and stringing lengths Joint locations of conductors Location of tower with joint box of OPGW and down-lead details Stringing tension Crossing details and protection locations details Drums identifications Pilot wire size and strength Personnel location for operation, control and surveillance Stringing pulley The entire stringing work of conductor and earth wire/opgw shall be carried out by tension stringing technique. The contractor shall indicate in his offer, the sets of tension stringing equipment he is having in his possession and the sets of stringing equipment that would deployed exclusively for this project. J D-RPT-EL-01 REV 0 Page 13 of 65

18 During the conductor stringing process, the drums and the conductors shall be continuously monitored, to detect possible defects. In case of defects, the activity shall be suspended and a joint survey with the Employer shall be carried out in order to decide the way to proceed. Conductor sag measurement tools using surveying instruments and other necessary tools along with specialized personnel shall be provided by the Contractor during stringing operation. These tools should be available for the use by the Employer to check and inspect the conductors stringing works. 4.6 Insulator strings and fittings Insulator strings Silicone rubber Polymer insulators are proposed for all suspension and tension towers. The tension insulator strings must have a breaking capacity greater than or equal to the conductors rated tensile strength. The Contractor shall assemble and install the insulator sets (insulator and fittings) in accordance with the approved detailed drawings. For Each Insulator type, before shipping and delivery to site, the Contractor should assemble a complete insulator set to ensure that all parts are compatible and no collision occur between fittings and glass insulators. The complete insulator sets shall have minimum specified mechanical load (SML) not less than 100 kn for single suspension string and not less than 2x100 kn for double suspension string. Similarly, complete insulator sets shall have minimum specified mechanical load (SML) not less than160 kn and 2x160 kn for single and double tension sets respectively. The areas for the lines path are considered as polluted areas and the creepage distance is considered minimum 38 mm/kv. Therefore, the minimum required creepage distance is: a kv x 38 mm/kv= 2755 mm J D-RPT-EL-01 REV 0 Page 14 of 65

19 Table 4-6: Insulator string types and application Insulator Type Insulator description Towers Application Single suspension Double suspension Single tension Double tension Single Jumper Silicone rubber Polymer, minimum creepage: 2755 mm, Strength: 100kN. Silicone rubber Polymer, minimum creepage: 2755 mm, Strength: 2x100 kn. Silicone rubber Polymer, minimum creepage: 2755 mm, Strength: 160 kn Silicone rubber Polymer, minimum creepage: 2755 mm, Strength: 2x160 kn. Silicone rubber Polymer, minimum creepage: 2755 mm, Strength: 100kN. Suspension towers Suspension towers Tension towers Tension towers Tension towers Double suspension and/or Tension insulators should be used for special crossings with roads or highways, railways, waterways, and other overhead lines Main fittings selection The main insulator s fittings and hardware for this project are the arcing horn, yoke plate, clamps and compression joints. All insulator sets must be equipped with arcing horn devices, fulfilling the function of protection of insulators and conductors when flashover occurs. Arcing horns are required to protect the insulators from damage during flashover arcs or overvoltage due to atmospheric electricity, lightning strikes, or electrical faults. Horns are paired on either side of the insulator, one connected to the high voltage part and the other to ground. The distance between the two arcing horns should be less than or equal to 0.95 x the length of the polymer insulator. Armor Grip Suspension clamps should be used. Suspension and Strain clamps are mainly used to connect the conductor and ground wire to the insulator strings or connect the ground wire to the tower arms through link fittings. Compression joints are used to join two parts of conductors from two different drums during stringing operation. Appropriate measurements shall be carried out by the Contractor after line s installation to verify the strength of all compression joints. These measurements shall be documented and approved by the Employer/Engineer. J D-RPT-EL-01 REV 0 Page 15 of 65

20 To guarantee the required electrical distance to the structure in swinging condition, the suspension insulator set can be equipped with counterweights, directly connected to suspension clamps, subject to approval by the Employer/Engineer Tests Polymer Insulator should be tested according to IEC All galvanized parts shall be well zinc coated of uniform thickness and shall be free from imperfections such as flux, rust, stains etc. Fittings shall be subjected to all relevant tests (type test, sample test & routine tests) in accordance with Table 1 of IEC: Tower earthing The earthing systems of the transmission towers shall be designed to safely discharge lightning strikes and ensure the safety of the public by keeping step and touch voltages caused by fault currents to acceptable levels. Earthing system is also necessary in order to avoid damage to other installations and properties and to protect all the line elements considering the economic compromise between the cost of the earthing system and the desired reduction of earth fault current flows. The Contractor shall issue and submit for approval the Earthing Arrangement. The final arrangement shall be defined after successful measurement of tower earth resistance. The Contractor shall ensure that structures are sufficiently and permanently earthed and that the maximum required tower location resistance (10 Ohms) for each line and tower site is maintained. The Contractor shall supply earth readings per tower site for approval by the Employer/Engineer. Where high earth resistivity readings are obtained, the Contractor shall propose means for lowering these readings to the recommended tower footing resistance per site. The Earthing systems of the transmission towers shall be designed to safely discharge lightning strikes and ensure the safety of the public by keeping step and touch voltages caused by fault currents to acceptable levels Adopted data of the earthing system a) Maximum required earthing resistance should be less than 10Ω for all towers. b) Horizontal earthing electrodes, connection between tower legs and earthing system, and earthing conductors (counterpoise) should be made of 30 x 4 mm galvanized steel strip. c) Vertical earthing electrodes will be made of stainless steel (ø20 mm diameter, 1.5 m long) to be embedded in concrete foundation. J D-RPT-EL-01 REV 0 Page 16 of 65

21 The four tower legs should be connected to the earthing system. The connection between the tower legs to the earthing system should be embedded inside PVC tubes in the tower foundation Soil Resistivity Resistivity measurements shall be made at each tower location by the Contractor. According to measurements, the most suitable earthing type for each tower shall be applied. Resistivity measurements shall be made in the dry season Earthing system resistance test Following the installation of the earthing system, the Earthing system resistance test measurements shall be made for each tower location by the Contractor. The earthing resistance value should be as per the above mentioned requirements 4.8 Line Route Line route description The line route is through open land and is parallel to an existing 33 kv line. Refer to the Drawings Nos. J D-TD-E-LT-00 & profile Drawings Nos. J D-TD-E-LT- 01 to 17 for the line route. The final route shall be determined by the Contractor and submitted to the Employer for approval. The Contractor shall submit, in two months from the Award letter date, land maps showing the line route and coordinates to get the necessary approvals of the right of way of the line route. Access and maintenance roads maps shall also be submitted to the Employer. The Contractor must use the existing access roads where available and build additional access roads for construction and maintenance where required. For the final line route, the Contractor shall take into account environmental conditions, obstacles, construction and maintenance problems, parallelism with existing infrastructures (telecommunication system, pipe lines, Transmission lines, and underground cables) and of electromagnetic impact in populated area Line Route Angle Points Coordinates Route angle points and coordinates are reflected in drawing No. J D-TD-E-LT-18. J D-RPT-EL-01 REV 0 Page 17 of 65

22 4.8.3 Topography condition The altitude of the terrain, where the line passes, is in the range of 15m to 90m above Dead Sea level. The land mainly consists of plains (90%) and low hills (10%) Line Survey and Profiling The contractor should carry out aerial and/or land detailed line route surveys of the line by approved electronic survey means (using LIDAR, total station, GPS, etc. ). The survey shall be performed by qualified aerial/land surveyors. The survey party chief shall comply with all survey licensing requirements of the local regulations. The party chief (or other supervisor conducting the survey effort) shall have prior experience in survey work. Proper instruments, equipment and procedures shall be employed to produce an accurate topographic survey consistent with local codes and regulations. The survey controls shall be tied to the approved coordinate system, and shall originate at an established benchmark. The elevations shall be based on mean sea level or any approved local datum. The accuracy of survey shall be such that the vertical tolerance between levels forming the profile and actual ground level shall not exceed 30 cm and the horizontal distance to the accuracy of not more than 0.2%. The contractor will be required to produce a digital ground line profile with side profiles using PLS-CADD software of each line including all surveyed data and obstacles. The towers shall be plotted on the digital ground line profile using PLS-CADD software with tower optimization capabilities. The backup file shall be given to the Employer. The result will show type and height of towers, lower conductor and OPGW catenaries at maximum temperature and at minimum temperature, conductor tensions at maximum wind condition, clearance template, ruling span length and single span lengths. At each tower location and span, the following check shall be made: - Compliance with tower strength according to Technical Specifications. - Compliance of calculated swing angle of suspension insulator set with limits defined in Technical Specifications - Compliance with Conductors Tension limit values at EDS, Maximum wind and Minimum Temperature conditions. - Compliance with external clearances specified in Technical Specifications Line route survey and clearing This section is applicable for 66 kv overhead transmission line route survey and clearing works. The line route survey shall include, but not being limited to, the following tasks: i. The actual line route survey J D-RPT-EL-01 REV 0 Page 18 of 65

23 ii. Plan and Profile iii. Clearing and cleaning of the right of way (ROW) iv. Access roads The actual line route survey All buildings, overhead lines, cables, pipelines, roads, walls, fences, tanks and other firm obstacles, which differ from the general shape of the ground, reaching to the right-of-way area, shall be measured by location, length, height, level and slope and drawn on the line route map and digital ground line profile (PLS-CADD). The ground level and slope shall be determined by adequate intervals and where the ground slope changes. The boundaries of plots of land shall be also mapped up to an offset distance of 50 m on both sides of the center line (Total of 100m). The following levels of objects that need to be measured: 1. Roads 2. Crossing of overhead lines and towers 3. Water levels (actual water level with date and time and highest flood water level) 4. Buildings, tanks, structures 5. Fences and walls, etc. 6. Woods/bushes, water streams, muddy areas, trees Plan and Profile After the survey, the plan and profile of the line route shall be produced. The right-of-way shall be shown on the plan in scale 1:2000. The profile of the center line shall be drawn in horizontal scale 1:2000 and in vertical scale 1:500. All vertical transition points more than 1.5m shall be shown on the profile and also the levels of the following objects: 1. Roads 2. Crossing of overhead lines and towers 3. Water levels 4. Buildings, tanks 5. Fences and walls, etc. The Contractor shall provide the horizontal coordinates and elevations of all features and reference points related to line route survey. The Contractor shall also provide a master plan, preferably to scale 1:50,000 to correlate all survey sheets, indicate main communications, property boundaries, trigonometrical stations relative to the line route, and tabulate all data required for pegging of tower/pole positions, J D-RPT-EL-01 REV 0 Page 19 of 65

24 including angle points with the appropriate measurements and directions and angles of deviation Clearing and cleaning of the right of way (ROW) In order to ensure safe operation of the line, various trees or shrubs within the 22.5 m range on both sides of the transmission line centerline (total 45 m) must be cut. Clearing the ROW from trees need special governmental approvals. The cost of such clearing stated above shall be at the Contractor s own expense and is deemed to be included in the Contractor s Price Access Roads The contractor should construct access roads for line construction and future operation and maintenance works where necessary. New constructed access roads should be of compacted gravel. Drainage ditches should be provided where necessary. All new and existing access roads on the line route area shall be marked by the contractor on the route map. 4.9 Weather loading cases Below is a summary table for the standard weather conditions. Table 4-7: Standard Designed Weather Conditions Condition Temperature ( o C) Wind Speed (m/s) Ice Cover Thickness (mm) Minimum Average Temperature Maximum Ambient Temperature EDS temperature Gust wind speed (at 10m) J D-RPT-EL-01 REV 0 Page 20 of 65

25 Table 4-8: Weather Loading Cases Load case Wind Pressure Temperature Minimum Temperature 0 5 o C EDS Temperature 0 30 o C 85 o C after Maximum Temperature for Clearance Checking 0 creep Maximum Wind Pressure 15 o C (h=23.8 m) 1331 Pa for AAAC YEW conductor Maximum Wind Pressure for OPGW Ground wire (h=30.6 m) 1418 Pa 15 o C Table 4-9: Sag and Tension Conductor & OPGW Sag and Tension Minimum Temperature Condition Conductor / OPGW Span Length (m) EDS-No wind (Final) Wind Pressure: Conductor: 0 Pa OPGW: 0 Pa Temperature (Deg C) Tension (kn) Sag (m) Max Wind Condition (Initial) Wind Pressure: Conductor:1331 Pa OPGW: 1418 Pa Temperature (Deg C) Tension (kn) Sag (m) Maximum Operating Temp. No wind (Final) Conductor: 0 Pa OPGW: 0 Pa Temperature (Deg C) Tension (kn) Sag (m) AAAC YEW (19%) (49%) OPGW (18%) (48%) Insulation Coordination Polluted area classification and distribution The areas for the lines path are considered as polluted areas and the creepage distance is considered minimum 38 mm/kv Lightning protection All towers geometry should be designed so that the height and position of ground wire arms are sufficient for the maximum lightning protection angle of 30º. The Contractor should submit insulation coordination report and calculations to verify the tower geometry for the approval of the Employer/Engineer. J D-RPT-EL-01 REV 0 Page 21 of 65

26 Minimum distance between conductors Minimum required distance between conductors should be as per EN , Table 5.8. For 66 kv line, Dpp=780 mm as per EN , table Minimum internal clearance requirement Minimum air clearances should be calculated by formulas given in EN (Annex E) and EN The basic requirements for insulation coordination are shown in the following table: Table 4-10: Basic requirements for insulation coordination Rated voltage Maximum voltage Rated lightning impulse voltage Switching overvoltage 66 kv 72.5 kv 325 kv 250 kv The contractor should submit Insulation Coordination and Electrical Clearances calculation report including tower geometry, insulators swing angles and safety clearances for each tower type. The wind load cases for determining the minimum required electrical clearances are as follows according to EN : Three wind load cases are to be considered: 1- still air; 2- Nominal wind load for a 10 minutes mean wind velocity, with a 3 year return period. 3- Extreme wind load for a 10 minutes mean wind velocity, with the reference 50 year return period Tower Signage Plates This section describes the various types of signage plates that should be installed on towers. These Signage plates should be designed and installed according to the Employer guidelines and requirements and should be clearly visible from the ground or from aerial inspection. Below is the list and description of the required signage plates on Towers: 1- Identification plate: Dimensions: 210x190x2mm, should include: a. Line name b. Level of voltage. c. Number of the tower. This plate should be installed at 3 meters from ground level for all towers. J D-RPT-EL-01 REV 0 Page 22 of 65

27 2- Warning plate: Dimensions: 320x320x2mm with the text Danger High Voltage. This plate should be installed on all towers at 3 meters from ground level. 3- Aerial Inspection plate: Dimensions: 750x400x4mm with the tower reference number. This plate should be installed every ten towers and on Terminal towers at the top and on two sides of the Tower. 4- Phase identification plate: With three colors (Phase R Red, Phase S Green and Phase T Yellow). This plate should be installed on the two sides of the towers every ten towers along the line and on terminal towers Warning Spheres The warning spheres shall be installed for all line spans according to ICAO Annex 14, chapter 6 guidelines and recommendations. Two types/colors of aerial marker balls are considered (white and red/orange colors) to be used interchangeably on the OPGW. The sphere shall be installed with preformed armor rods. The Marker Ball should have the following characteristics: Minimum diameter 600 mm; Approximate weight: 4 kg; White or red/ orange; Made in reinforced polyester fiberglass or other equivalent material; Fixation on the cable with aluminum clamps During the detailed design stage the contractor should submit the locations and numbers of warning spheres. The warning spheres should be included also in PLS-CADD model Tower Anti-Climbing devices Each tower shall be fitted with an approved anti-climbing device which shall provide climbing facilities for use by authorized personnel. Anti-Climbing devices should be provided for all Towers and should be mounted at a height of 3m above ground to prevent ease access to the top of the tower by unauthorized personnel. The anti-climbing devices should be made of hot dip galvanized steel and to be installed on the inner and outer sides of the tower. The anti-climbing devices shall be made of hot dip galvanized steel to stand the man weight 100kg 1.5 (safety factor) and to be installed on the inner and outer sides of the tower. J D-RPT-EL-01 REV 0 Page 23 of 65

28 Figure2: Sketch of anti-climbing device 4.14 Steel structure Design standards and specifications The Transmission line shall be designed and executed in accordance with the specific and general requirements mentioned below. The 66 kv line Towers should be designed and constructed considering the following standards/specifications listed in the below table: Table 4-11: Design Codes Name of the Standards Number & Revision National Normative Aspects (NNA) for Great Britain and Northern EN :2017 Ireland Overhead electrical lines exceeding AC 1 kv Part 1 EN :2012 Eurocode 3: Design of steel structures Part 1-1: General rules EN :2005 and rules for buildings Eurocode 3: Design of steel structures Part 1-8: General EN :2005 Design of joints Eurocode 3 Design of steel structures Part 3-1: Towers, EN :2006 masts and chimneys Towers and masts Eurocode 8 Design provision for earthquake resistance of structures Part 3-1: Towers, masts and chimneys Towers and masts EN 60652:2004: Loading test on overhead line structures EN 60652:2004 IBC 2012 for seismic design J D-RPT-EL-01 REV 0 Page 24 of 65

29 Steel structure load cases The steel structural load cases for suspension, tension and terminal towers should be based on Section 4 Actions on Lines in EN (British NNA) in accordance with partial factors indicated in EN considering Reliability Level 3. For every tower, the Contractor should prepare and submit load trees calculation documents for approval by the Employer/Engineer. The Contractor should submit the loads related to Construction and Maintenance based on the detailed procedure of conductors stringing and installation for Employer/Engineer approval. The Contractor should submit for every tower the following for approval by the Employer/Engineer: Tower construction drawings. Two types of soft copies of PLS-Tower models; the first for main members and the second for all members including redundant ones for verifying the structural strength. For load trees calculations, the maximum conductor tensions are considered at initial condition. p Load cases The assumed maximum simultaneous working loads shall be combined with safety factors specified in the scheduled data. The following load cases shall be considered as per BS EN section 4.13: Normal condition - Extreme wind load, all angles of wind incidence are to be considered Security condition - Broken wire Safety condition - Construction and Maintenance Special condition -Earthquake Suspension tower Max wind Condition: Max wind, minimum temperature Vertical loads - Weight of insulators, fittings and accessories. J D-RPT-EL-01 REV 0 Page 25 of 65

30 - Weight of conductors and guard wires in minimum and maximum weight span. - Weight of tower Transversal loads - Max wind pressure load, as per Data Schedule, acting on conductors, guard wires, insulator set and tower. - Angle component load due to tension of conductors and guard wires, calculated with the worst ruling span at condition case. This will not be considered if the tower has zero angle. Longitudinal loads - No unbalanced loads are foreseen in phase conductors. Broken wire Condition: No wind with every day temperature. Breakage of one phase or one guard wire. Vertical loads - Weight load of insulators, fittings and accessories. - Weight of conductors and guard wires in minimum and maximum weight span. - Broken wires: the weight span is recommended to be reduced 40 %. - Weight of tower Transversal loads - Angle component load due to tension of conductors and guard wires calculated with the worst ruling span at condition case. This will not be considered if the tower has zero angle. - Broken wires: the line angle component shall be considered acting only on one tower side. This will not be considered if the tower has zero angle. Longitudinal loads - Broken wires unbalanced load shall be applied. For the broken phase, a reduction of 30% of the tension is allowed. No reduction for broken guard wires is allowed. Maintenance Condition: No wind, minimum temperature. Vertical loads - Weight load of insulators, fittings and accessories times weight of conductors and guard wires in maximum weight span. - Weight of equipment and lineman: 1.5 KN. - Weight of tower Transversal loads J D-RPT-EL-01 REV 0 Page 26 of 65