Power and transmission
SDEC has completed a number of transmission line and substation projects for the Saudi Electricity Company, with power projects in Iraq and Pakistan.
Disciplines and deliverables
Transmission lines
SDEC provides engineering design for HVAC and HVDC overhead transmission line projects at voltage levels of 132, 230, 380, and 500 kV. Our services cover line layouts, tower structures, foundations, and coordinated design verification.
- Transmission line route plan
- Plan and profile with structures
- Sag and tension calculations
- Ruling span calculations and stringing charts
- Tower foundation design
- OPGW arrangement and retrofitting
Underground cables
- Key route plans and sections
- Ampacity, short-circuit and induced-voltage calculations
- Cable sheath bonding schemes
- Link box and joint box details
- Trench, duct bank and HDD plans and sections
- Fibre optic cable layouts, schematics and interconnections
Substations & power plants
SDEC provides multidisciplinary engineering design for new substations and modifications to existing facilities. We integrate electrical, protection, civil, architectural, and mechanical systems into coordinated design packages.
- GA drawings development
- Power cabling, lighting and earthing layouts
- System protection
- Plan and profile with structures
- Interfacing with protection panels, SCADA and telecom systems
- Power plant system design (balance of plant)
Power system studies
- Load flow
- Short circuit
- Motor starting
- Transient studies
- Arc flash studies
- Relay coordination
Induced voltage studies
- Transmission line and railway track modelling in SolidWorks
- Electromagnetic and electric field simulations in Ansys Maxwell
- Static, frequency-domain and time-varying field solutions using finite element methods
- Recent EHV and HVDC projects
- 10
- Kilometres of overhead transmission line
- 1,736
- Highest voltage, HVDC
- ±525 kV
- Kilometres in the longest single section
- 367
Other services
Engineering design
Architectural, civil and structural, electrical, HVAC, fire fighting, process, piping, telecoms and BIM - taken from concept to tender documents.
Supervision and project management
Construction supervision and management, commissioning support, planning, scheduling, cost and document control - keeping projects on track for quality and time.