330kV WAPP Coastal Transmission Backbone Project, Accra, Ghana (West Africa)

Client: Volta River Authority/GRIDCo

Company: Poyry SedPower AB

Position held Resident Project Manager

Projects:

Package - 1A

Supply of Conductors and Insulators, Design, manufacture, testing and delivery to site of ‘TERN’

conductors, Alumoweld shield wires and OPGW as well as fog type U120 BP and U160 BSP glass insulators for the construction of transmission line as amende

Package - 1B

Construction of Volta - Aboadze 330kV Transmission Line 218km Construction of approximately 215km of 330 kV single circuit twin bundle ‘TERN’ conductor transmission line. It covers the design, manufacture, testing and supply of steel towers and other associated accessories, storage of conductors ‘TERN’ and Alumoweld shield wires, fog type U120 BP and U160 BSP glass insulators from others and the transportation and distribution of materials to the various tower locations as well as all relevant civil works, tower erection and stringing activities.

Package - 1C

161 kV Substation Works, Design, manufacture, testing as well as the supply, installation and commissioning of 161 kV Switchgear and electromechanical equipment at the Aboadze Switchyard and Volta Switching Station for the termination/interface of the 161 kV facilities with the 330 kV ones and /or the line.

Package - 1E

Construction of 330kV Substation (Volta and Aboadze SS) Design, manufacture, testing and erection of substation equipment such as Circuit Breakers, Disconnect Switches as well as Protection,

Control and Metering facilities and the construction of 330 kV Substations at Aboadze and VoltaPackage - 1F

Supply of 4 ea. Auto Transformers with Phase Shifting Capabilities

Design, manufacture, testing and delivery to the project site of 4No. 200MVA 330/161 kV, three (3) Phase Autotransformers with Phase Shifting Capabilities

Package - 1F

Supply of 4 ea. Auto Transformers with Phase Shifting Capabilities

Design, manufacture, testing and delivery to the project site of 4No. 200MVA 330/161 kV, three (3) Phase Autotransformers with Phase Shifting Capabilities

Package 3&4

Upgrade of Electromechanical Equipment 161kV at Akosombo G. S. Switchyard and Volta Switching Station

Design, manufacture, testing, erection and commissioning of 161 kV electromechanical equipment including but not limited to circuit breakers, disconnect switches, protection and control facilities to replace existing over aged and obsolete ones to upgrade the facilities at the Volta Switching Station and the Akosombo G.S. Switchyard to ensure the reliability of power supply into the WAPP.

Package 5-1

Supply of 1 ea. Phase Shifting Transformer & 1 ea. Reactor for the Expansion of the 330kV Volta Substation and 161kV Asiekpe Substation

Design, manufacture, testing and delivery of 161 kV Phase Shifting Transformer and 330 kV Reactor for installation at the 161 kV Asiekpe Substation and 330 kV Volta Substation respectively to ensure efficient and reliable operation of the 330 kV Volta-Tornu Transmission Line to meet the Objectives of the WAPP.

Package 5-2:

Construction of Volta Mome Hagou 330kV Transmission Line 160km

Construction of approximately 140 km single circuit 330 kV transmission line from the 330 kV Volta Substation in Tema (Ghana) to Tornu on the Ghana-Togo Border to increase the power transfer between Ghana, Togo, Benin and Nigeria in the West African sub-region and is funded by the African Development Bank.

Package 5-3:

Expansion of 330kV Volta and 161kV Asiekpe Substation

Expansion of the 330 kV Volta Substation and 161 kV Asiekpe Substation for the termination of the Volta-Tornu Line and accommodate the Reactor and the Phase Shifting Transformer (PST) as well as relevant switchgear, protection and control facilities and associated civil works respectively.

During the implementation of the project, the PST which was originally to be located at the 161 kV Akosombo Switchyard was relocated to the 161 kV Asiekpe Substation due to space and technical constraints.

Package 5-4:

Supply and Installation of Plant and Equipment 161kV for the Third Bulk Supply Point for Accra/Tema

Design, manufacture, testing and delivery as well as the installation of balance of plant substation equipment including circuit breakers, disconnect switches as well as protection, control and metering facilities and associated civil works including the construction of control building, etc. at the Accra East and Achimota Substations and installation of Power and Auxiliary Transformers as well as the associated Transmission line works.

Package - 5-4-3:

Supply of 2No. 50/66MVA 161/34.5kV Power Transformers; 2No. 250kVA 34.5/0.433kV Grounding / Auxiliary Transformers

Design, manufacture, testing and delivery of the following transformers for installation at the Accra East Substation:

 Two (2 No.) 50/66 MVA, 161/34.5kV Power Transformers

Two (2 No.) 250kVA, 34.5/0.433kV Grounding/ Auxiliary Transformers.

Package -6:

Rehabilitation of GS Kpong 161kV Switchyard

Design manufacturing, testing, delivery and the replacement of electro-mechanical switchgear including circuit breakers, disconnect switches, instrument transformers, protection, relaying and metering facilities to upgrade the Kpong Generating Station Switchgear and associated civil works.

Package – 7:

Rehabilitation of Cranes and rust Treatment of Cranes and Penstocks at the Akosombo Generating Station

The Penstocks and Cranes at the Akosombo Generating Plant were over-aged and at the end of their useful asset life.

Essential spares for the existing 85 Ton Intake Crane and 450 Ton Main Power House Crane were also not readily available.

The rehabilitation of the cranes and rust treatment of the cranes and penstocks was to maintain and /or increase the reliability of the facilities.

Package – 8:

Upgrade of VRA Training School

The VRA Training School was to be upgraded and equipped to provide training in maintenance and operating skills to support the WAPP Organization.

The scope for the upgrade was envisaged to involve the provision of:

 Modular Power Plant Simulator (Generation, Transformation, Distribution etc.)

 330kV Transmission Line Training Field

 Training Staff Technical Capability Upgrade

Development of Training modules (Hydro and Thermal Generation, Dispatcher Training etc.)

The Consultant performed Training of VRA/GRIDCOs personnel on the following subjects:

• Basic High Voltage OHTL Design

• EHV Substation

• Fundamental of Protection Relaying

• Operation & Maintenance

• 330 kV Circuit Breaker and 330 kV Disconnect Switch