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Tim Spearing
Product Marketing Manager
Lucy Electric
United Kingdom
Samuel Boakye-Appiah
Director, Network Projects
ECG
Ghana
How distribution automation
techniques improve quality of
service performance in Ghana
Tim Spearing
Product Marketing Manager
Lucy Electric
United Kingdom
Samuel Boakye-Appiah
Director Network Projects
Electricity Company of Ghana
Ghana
• Introduction to ECG
• ECG requirements for Distribution Automation
• DAS projects in Ghana
• Design, installation & commissioning of DAS
• Challenges and how they were overcome
• Distribution Automation Benefits
• Quality of Service & Automation
• Conclusions & Future Considerations
Presentation Content
Electricity Company of Ghana Introduction
• ECG – Owned by Government of Ghana
– Operates in six political regions
– Divided operational area into 9 divisions and a sub-transmission
division
• ECG’s vision – To be among the leading electricity companies in Africa
• ECG’s mission – To provide quality, safe and reliable electricity services to support the
economic growth and development of Ghana
Distribution Automation
System (DAS) Project
– Reduction in operational costs
– Reduction in system losses
– Improvement in reliability
• ECG’s requirements – Faster fault identification / location
– Faster restoration times
– Flexibility in network operations
• Improving operational efficiency – Monitoring & control of electrical distribution regions
– Remote control to provide fast restoration
– Redundancy and alternative sources of electrical supply
• Key findings – Communications is critical
– Effective maintenance and good practices
DAS Automation Project
Dwenase
Bogoso
Essiama Takoradi
Accra Tokuse
Saltponds Cape
Coast Winneba
Koforidua
Nkawkaw
Ada
Somanya
Tema
Ho
Kpando
Nkwanta
Kumasi
Development of ECG’s DAS
• Phase 1 – Pilot scheme in Accra and Bogoso
• Phase 2 – Accra and Kumasi upgrade
• Phases 3 & 4 – 15 SCADA District Control Centres
• 7 new control rooms
• 8 control room upgrades
– 176 secondary sites
Lucy Electric
Phases 3 & 4 of ECG’s DAS • System Design
– Radio Surveys
– Communication System
– SCADA System Design
• SCADA – 7x New SCADA dual redundant
systems
– 8x SCADA upgrades
• Switchgear and RTUs – 57 x 11kV Automated GIS
– 90 x 33kV Automated GIS
– 29 x 11kV Automated RMUs
– Repeater stations
• Installation &
commissioning
Key Success Factors
• Flexibility in approach – Dynamic nature of network expansion
• ECG SCADA Technical Team – Local District Engineering Staff
– Local support and knowledge
• ECG Project Office – Excellent support to Lucy Electric
• ECG Head Office – Excellent relationships
– Open debates
DAS District Control Control Room
• Remote Control – Dynamic nature of network expansion
• Access to data – Switch position
– Gas Pressure
– Line monitoring
DAS District Control Secondary Sites - Overview
District Control
Station
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1
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1O
1O
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1
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1O
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UHF Radio
Secondary Sub
Secondary
Sub
Secondary
Sub
Secondary
Sub
Repeater
UHF Radio
Primary
Backup
Dual redundant SCADA UHF 450 – 462 MHz
DAS District Control Secondary Sites – Ground Mount
• Control – Local / remote
operation
– Programmable
schemes
• Measurement – Event recording
– FPI
– Temperature
– Line monitoring
• Reliability – Built-in UPS
– Voltage from LV
Supplies
– 24 VDC battery
backup
DAS District Control Secondary Sites - Overhead
• Control – Local / remote
operation
– Programmable
schemes
• Measurement – Event recording
– FPI
– Temperature
– Line monitoring
• Reliability – Built-in UPS
– Voltage from VT
– 24 VDC battery
backup
DAS District Control Secondary Sites - Challenges
• Location – Access
– Road structure
– Vegetation
– Buildings
• Weather
• Voltage
irregularities – Damage
– Earthing
• Desk top planning using radio path analysis software
• Survey of all sites to measure actual signal path attenuation
• UHF Radio System, 450 – 462 MHz frequencies
• Planning and construction of dedicated repeater sites
• Use of existing switch sites as repeaters to minimise cost
• Careful system design to minimise interference from adjacent regions
Communications System Design Detail
Communications System Radio Survey
Communications System Central – Saltpond
Flexibility Release of upstream capacity
S/S -A S/S -B
MV
A
Years
5
10
S/S -A
NOP
Faster restoration Improvement in time to restore services
Fault identification
Travel time to site
Fault isolation
Manual switching
Fault repair
Without automation
Tim
e Tim
e
Fault identification
Fault isolation
Travel to site
Fault repair
Travel time to site
Fault identification
Fault isolation
Travel to site
Fault repair
With automation
DAS Benefits Reliability & Availability • Improved Performance
– Improved operation decisions
– Improved engineering and planning decisions
– Pre-emptive approach
– Avoiding losses when equipment has failed
• Improved Response – Reduced period of interruptions
– Targeting “rogue circuits”
– Reduction in inspection visits
– Reduction in costs associated with operations
Quality of service & automation
Quality of Service Automation
Direct Indirect
CAPEX OPEX Service & maintenance
Fault location & isolation
Sectionalising
Service restoration
Voltage control
MV Monitoring
LV Monitoring
Key Performance Indicators
System design
Future considerations From data to intelligence
• Access to information
• Aging asset base
– Remove, Refurbish or Replace
– Extend the life of existing assets
with increased functionality
– Prioritisation
• Predictive Maintenance
providing an enhanced
understanding of the state of the distribution network
Future considerations Communications is key
• Variety and structure of
communications
• Management of vegetation
• Building developments /
planning
Future considerations Continue to be prepared
• Reinforce the working relationships
• Location of sites
• Equipment kits
• Outages
• Installation &
commissioning spares
• Electricity Company of Ghana
• Lucy Electric
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