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CONSTRUCTION OF 33/11KV SUBSTATION AT MPRAESO, GHANA AND CONNECTING FEEDERS / Ghana

Following an International Open Bidding process, The Electricity Company of Ghana (ECG) made a contract award to BES (Europe) Ltd to execute their Sub-transmission Reliability Enhancement Program in the Eastern Region. The works and services to be executed under the contract included:

o Construction of a Primary Substation at Mpraeso in the Eastern Region complete with interconnecting circuits.

o Supply of Distribution materials for offloading the primary substation.

o Provision of Critical Spares for the Substation.

The Project scope included the Design, Supply, Installation and Commissioning of a new 33KV substation in Mpraeso, Eastern Ghana, to accomodate 2 x 20MVA transformers, 8 x 33kV GIS indoor feeder panels, 2 x transformer panels, 1 x bus-coupler and 12 x 11kV indoor feeder panels.

In addition, the project included the design , supply, installation and commissioning of a new 11km 33kV double circuit transmission line on lattice towers to connect the new substation to the existing network.

Project duration was scheduled for 18 months, and was completed on time and within budget.

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Benefits of the project in the proposed areas included the following:

o Expansion of the existing sub transmission and distribution network capacity to meet growing demands,
o Improved system reliability in wheeling power from all sectors of the sub-transmission network
o Improved customer end voltages
o Improved system reliability.

Prestea - Bogoso 161kV Transmission Upgrade Project / Ghana

Design, Supply, Installation and Commissioning of a 161kV Transmission Line and Substation.

Background

To improve power evacuation from the western to the northern part of Ghana, the existing Prestea Bogoso 161kV transmission line was to be decommissioned and replaced by a new 161kV double circuit, twin-bundle conductor transmission line and the 161/34.5kV outdoor substation at Bogoso was to be upgraded. The contract was put out to international competitive tendering and BES was awarded the contract as the best evaluated bidder.

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Products and services supplied

Transmission Line:

The works included the decommissioning of the existing 161kV power line, the complete design of the new line, demolition of the old line, construction of new foundations, erection of towers, installation of fittings, stringing of conductor and OPGW shield wire and their termination at the Prestea and Bogoso Substations.

Substation:

The 34.5kV obsolete indoor switchgear was decommissioned and replaced with a new 34.5kV metal clad air insulated switchgear; two sets of three-phase 161kV pantograph disconnector switches were decommissioned and replaced by new ones and an emergency 50kVA diesel generator set was supplied and installed. BES also designed, supplied and installed a new mosaic MIMIC control and metering panel board and an annunciator panel to control the entire 161/34.5kV substation. All the installed equipment was commissioned by BES.

The work required careful planning as there were strict limits to power outages due to the fact that the existing line and substations were the main supply to large gold mines in the area. To that effect the supply was re-routed through the temporary construction of a loop-in loop-out solution for the transmission line and of a by-pass for the substation.

BES arranged the finance for the project through its UK bankers with support from the Export Credit Agency of the UK Government.

Results

The project was completed on time and within budget and the power outages were kept to a minimum as the customer required.

Ofankor Substation / Ghana

Design, Installation and Commissioning of a 33/11kV Distribution Substation in Accra, Ghana.

Background

Due to an overloaded system throughout Ghana, the Electricity Company of Ghana have been investing heavily in reinforcing the system, including building a number of new distribution substations.

BES Group won the contract to build a substation in the Ofankor area of Accra.

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Ofankor Substation

Products & services supplied

BES Group designed the new substation in close cooperation with the engineers of the Electricity Company of Ghana. The substation includes 2 x 20/26MVA ONAN/ONAF Transformers, 33kV outdoor switchgear, 33kV indoor switchgear, SCADA communication control system and ancillary equipment.

The site became operational in 2008.

Ofankor Substation

Results

The investment resolved the overloading problem in this particular area of Accra and the site allows scope for increasing the number of bays.

Mini Power Station / Ghana

Design, Installation and Commissioning of a Standby Power Station for a military base in Accra, Ghana.

Background

The customer was struggling to maintain a continuous and sufficient power supply to the military base. The existing standby generators were no longer operating and had become obsolete.

The customer decided to contract BES Group to install a new 8 MW standby power system, into an existing building.

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Mini Power Station

Products & services supplied

BES Group designed the power supply using 4 x 2500 kVA Paxman VP185 11kV generators. BES Group also designed the bulk fuel tanks, suitable switchgear and the operating system.

The generators were then fully installed and commissioned by BES Group into the customer’s existing building.

Mini Power Station

Results

The client benefited from a solution fully tailored to meet their standby power generation requirements and by working with one supplier from design and supply to installation and commissioning. BES Group has subsequently designed, supplied and installed 4 mini power plants at different sites for this client.

Transformer Performance Improvement / Ghana

Design, Supply and Installation of Air Cooling Systems for Transformers at Substations throughout Ghana.

Background

The client’s 11/33kV substation transformers were overloaded and regularly cut-out due to overheating.

The client contracted BES Group to design, supply and install air cooling systems to more than 50 transformers at substations across the country.

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Transformer Performance Improvement

Products & services supplied

BES Group designed, supplied and installed a battery of cooling fans to each transformer.

The cooling fan system was designed with an automatic temperature control panel to automatically monitor the temperature and switch on/off the cooling fans, when required.

BES Group upgraded more than 50 transformers over a period of 12 months.

Transformer Performance Improvement

Results

The client benefited from a significantly reduced number of electrical outages and as a result saved substantial revenue losses. Transformer performance was improved overall by 25%.

As a result of our efforts, all materials were delivered seamlessly to the customer, in perfect order and within the desired timeframe.

Standby Power Generation for Hospital / Ghana

Design, Installation and Commissioning of a Standby Power Station for a hospital in Accra, Ghana

Background

The customer was struggling to maintain a continuous and sufficient power supply to a large hospital. They required a soundproof standby power supply of 5000kVA (4MW) to fully operate the hospital in the event of mains failure.

Our customer contracted BES Group to design and install both the standby power system and the soundproof building.

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Standby Power Generation for Hospital

Products & services supplied

BES Group designed and installed an acoustic soundproof building to house the standby power supply system. The hospital environment meant noise pollution had to be kept to a minimum.

BES Group designed and installed the power supply using 2 x 2500 kVA Paxman VP185 11kV generators. BES Group also designed suitable switchgear and the operating system including auto mains failure. Fuel storage tanks were also supplied and installed.

Standby Power Generation for Hospital

Results

BES Group delivered a solution fully tailored to meet the client’s standby power generation and noise pollution requirements. Our expertise also provided the client with a seamlessly managed installation and commissioning of all equipment. All client staff were fully trained prior to the official hand-over.