Samuel Boakye-Appiah Tim Spearing Director, Network Projects Product Marketing Manager ECG Lucy Electric Ghana United Kingdom
How distribution automation techniques improve quality of service performance in Ghana
Tim Spearing Samuel Boakye-Appiah Product Marketing Manager Director Network Projects Lucy Electric Electricity Company of Ghana United Kingdom Ghana Presentation Content
• 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
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 • ECG’s requirements – Reduction in operational costs – Faster fault identification / location – Reduction in system losses – Faster restoration times – Flexibility in network operations – Improvement in reliability
• 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
Nkwanta
Kumasi
Kpando
Somanya Bogoso Ada Tema
Accra Takoradi Cape Tokuse Essiama Coast Saltponds Winneba Development of ECG’s DAS Lucy Electric • 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
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
Repeater
O 1 O 1 O O1 1 District Control Station Secondary Sub
O 1 O O 1 1 O O Secondary 1 1 O O Sub 1 Primary O1 1
UHF Radio O 1 O Secondary 1 Backup O O1 Sub 1
UHF Radio
O 1 O Secondary 1 O O1 Sub Dual redundant SCADA 1 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
Communications System Design Detail
• 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 Radio Survey Communications System Central – Saltpond Flexibility Release of upstream capacity
S/S -A
10
S/S -A S/S -B MVA 5
NOP Years Faster restoration Improvement in time to restore services
Without With automation automation
Fault repair Fault repair
Travel time to site Travel to site
Manual switching Fault repair Fault isolation Travel to site Travel time to site
Fault isolation Fault isolation
Fault identification Fault identification Fault identification Time Time 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
Fault location MV Indirect Sectionalising Direct & isolation Monitoring
Service & Service Voltage LV CAPEX OPEX maintenance restoration control 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