Description & Challenges

This project involved design and construction of 270 kilometers of 380kV overhead transmission line double circuit, vertical configuration, on latticed steel family of towers provided by the SEC , using four (4) x 454.5 mm² ACSR “Condor “conductors per phase With 2-48 core OPGW (24kA fault current capacity at 0.30sec. at 55°C initial temperature).

1. 380KV D/C OHTL inter connection of IRRQAA (#9034 BSP to # 9005 S/S.
2. 380KV S/C OHTL inter connection of IRRQAA (#9034 BSP to # 9002 S/S and IRRQAA (#9034) to #9004 S/S
3. 380KV S/C OHTL inter connection of IRRQAA (#9034 BSP to # 9018 S/S and IRRQAA (#9034) to #9050 S/S
4. 380KV D/C OHTL inter connection of IRRQAA (#9034 BSP to PP-12 (#9035)
5. 380KV D/C OHTL inter connection of IRRQAA (#9034 BSP to PP-13

The project demanded finalizing the existing three lines to be modified to LILO arrangement connecting to 9034 BSP and other two line starting from 9034 supplying to PP12 and 13.

The design also required to interface with substation and coordinate for the existing 380kV line crossings. The main challenge was to cross the existing 380kV lines. DAR team carefully studies the existing lines and proposed a special gantry under crossing the 380kV lines with required standard clearances. The project was successfully implemented.

Scope:

Complete design & Engineering services for Transmission Lines Works (Electrical & Civil design) till As Built Stage including Preparation of T/L route, Plan and Profile Drawings with spotted structures , Structure List , Sag template Curves, Grounding System Design for Structures, installation of OPGW joint Boxes on Latticed Steel Structures, Selecting OPGW Joint Boxes Locations, Sag and Tension Calculations for Conductor & OPGW , Stringing Sag and Tension Charts, Foundation Design Calculation & Drawings for structures, Access road ; Finger roads and Structure Pads design , crash barriers protection design and Preparation of B.O.Q, verifying technical compatibility of Vendor equipment's and materials, support in meeting with Saudi Electricity Company.