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.

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.

Results

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

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.

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.

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.

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. 

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.

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.