engineering intelligent solutions

Case Study: Increased Network Efficiency

In a rapidly developing market, efficient electricity infrastructure is vital in supporting businesses and consumers. Ghana, one of Africa’s fastest growing economies, is a prime example.

The Electricity Company of Ghana (ECG) distributes electricity in the southern part of Ghana. Wholly owned by the Ghanaian government, ECG provides electricity to 3.1 million domestic and business customers.


The challenge

ECG’s fast developing customer base and increasing demands on its network meant that it was imperative to speed up fault identification and restoration. In addition, Ghana has experienced a rapid expansion of the electricity network through the government’s ongoing Rural Electrification Programme achieving a national coverage of 76% , the highest in the West African Sub-region. Repeated outages, leading to both consumers and companies losing electricity supply, as well as increasing operational costs, meant improving system reliability was a must.

ECG had already used Lucy Electric’s services and consultative expertise to install tailored automation systems in Bogoso, Tokuse and parts of the underground network in the capital city, Accra. Following the completion of this project, Lucy Electric was contracted to further extend automation on ECG’s network.

Lucy Electric’s task was to create an automated system across a wide area of the ECG electrical distribution system. The work spanned a huge expanse of Ghana, covering the Western, Central, Eastern and Volta regions, as well as Accra, Tema  regions.


The solution

The project involved supplying, installing and commissioning of all automation products and systems required for the modification of ECG’s existing network, to include the following:

  • Gemini SCADA or Gemini DC
  • UHF radio communication links including towers and radio surveys
  • Rapier GX-RC36 and GX-RC12 remote controlled, gas filled switches, including pole mounted Lucy Electgric VTs and Gemini RTU’s
  • RMU retrofit actuators and Gemini RTUs 
  • Installation of new EOS ground mounted 11KV switches
  • Supply and installation of all electrical materials and equipment required to modify the existing network to the new SCADA controlled automated systems

In total, 146 new overhead line sites, and 29 11kV new ground mounted sites, were supplied and installed by Lucy Electric. The project included installation and end-to-end commissioning of each secondary site to the proposed stand-alone Gemini SCADA system or Gemini DC. In all 15 SCADA control centres in local district areas were established and 40 radio repeater towers installed to link the switch sites to control centres via UHF antennas.

In addition, technical training was given to 20 staff from ECG, who came to the UK to be instructed on how to use all of the operational equipment. Refresher courses are provided to ECG staff as a sign of Lucy Electric’s continuing commitment to their client.

 

Overcoming the technical and environmental challenges

Firstly, from conception to installation, ECG’s requirements shifted several times, owing to the continuing evolution of ECG’s network.

The revisions led to some site location changes, which caused radio communication issues. ECG had to alter the network systems and provide Lucy Electric with revised drawings. This meant the existing SCADA software had  to be modified, radio signal routing had to be amended, remote site settings had to be re-programmed, and SCADA displays on CCS terminal screens had to be re-configured.

Installation involved overcoming the small matter of geography. ECG’s network covers very diverse terrain and exists within challenging climactic conditions. Heavy seasonal rainfall caused significant logistical problems for Lucy Electric. During the rainy season interior roads, such as in the Bogoso area in the Western Region, were virtually impassable, causing delays to deliveries and holding up progress.  Some sites became waterlogged so the teams couldn’t get the work underway.

Vegetation in Ghana can grow rapidly and is often very invasive. In several sites where a tower had been installed months before a switch site, the immediate area was completely overrun by foliage, so regular clearing was needed to gain access. These changes were carried out on time and within budget due to Lucy Electric’s flexible and pro-active approach to the project.


The outcome

Despite difficult geography and changing network requirements, Lucy Electric were able to deliver a tailored end-to-end automation system that enhanced ECG’s system operations. Only a bespoke system would work given the huge areas covered and the diversity of the terrain. To realise its concept, Lucy Electric employed the extensive technical knowledge of its expert engineers and logistical organisation to remotely operate ECG’s supply network and craft an automated, fully integrated management system.

Above all, the team of Lucy Electric and ECG were able to react quickly and effectively to a changing brief, making decisions promptly and gaining approval for altered installation plans as the project progressed.

The positive relationship between Lucy Electric and the ECG was one of main reasons for the projects’ success. Both parties were able to work together very effectively, aided by clear channels of communication and open and frank discussion when needed.  

As a result of phases three and four, fault location, repair and strategic switching time has been reduced. Prior to the projects, ECG staff had the time consuming task of visiting sites in order to operate the switches manually. Now, switches can be operated from central control rooms, streamlining the process and shortening power outages and down time.


Testimonials

Commenting on the successful completion of the project, an ECG spokesperson said, “Lucy Electric had already proved to be excellent partners in our earlier projects, and in this second project, their team proved to be first class again.

“The dynamism of our electricity network meant that Lucy had to adjust to moving goal posts – its team were not fazed and were able to work quickly to achieve this.  

“We’re very pleased with our decision to grant this contract to Lucy Electric, and we look forward to working with them on the next phase of automation on our network.”

John Griffiths, Lucy Electric CEO, added, “It was very enjoyable and rewarding working with ECG - the efforts made by the ECG SCADA development team and the excellent relationship with the local district engineering staff at ECG contributed enormously to the project.

We’re already looking ahead to phase five of the project, which will further improve the automation of the distribution network, with the installation of some 550 switches.”

 

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