Samuel Boakye-Appiah Director, Network Projects ECG Ghana. Tim Spearing Product Marketing Manager Lucy Electric United Kingdom

Transcription

1 Samuel Boakye-Appiah Director, Network Projects ECG Ghana Tim Spearing Product Marketing Manager Lucy Electric United Kingdom

2 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

3 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

4 Electricity Company of Ghana Introduction ECG wned by Government of Ghana perates 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

5 Distribution Automation System (DAS) Project ECG s requirements Faster fault identification / location Faster restoration times Flexibility in network operations Reduction in operational costs Reduction in system losses 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

6 DAS Automation Project Nkwanta Kumasi Kpando Dwenase Bogoso Ho Nkawkaw Koforidua Somanya Ada Tema Essiama Takoradi Cape Coast Saltponds Winneba Accra Tokuse

7 Development of ECG s DAS Lucy Electric Phase Pilot scheme in Accra and Bogoso Phase 2 Accra and Kumasi upgrade Phases 3 & 4 5 SCADA District Control Centres 7 new control rooms 8 control room upgrades 76 secondary sites

8 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 kv Automated GIS 90 x 33kV Automated GIS 29 x kv Automated RMUs Repeater stations Installation & commissioning

9 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 ffice Excellent support to Lucy Electric ECG Head ffice Excellent relationships pen debates

10 DAS District Control Control Room Remote Control Dynamic nature of network expansion Access to data Switch position Gas Pressure Line monitoring

11 DAS District Control Secondary Sites - verview Repeater District Control Station Secondary Sub Primary Secondary Sub UHF Radio Backup Secondary Sub UHF Radio Dual redundant SCADA UHF MHz Secondary Sub

12 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

13 DAS District Control Secondary Sites - verhead Control Local / remote operation Programmable schemes Measurement Event recording FPI Temperature Line monitoring Reliability Built-in UPS Voltage from VT 24 VDC battery backup

14 DAS District Control Secondary Sites - Challenges Location Access Road structure Vegetation Buildings Weather Voltage irregularities Damage Earthing

15 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, 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

16 Communications System Radio Survey

17 Communications System Central Saltpond

18 MVA Flexibility Release of upstream capacity 0 S/S -A S/S -A S/S -B 5 NP Years

19 Time Time Faster restoration Improvement in time to restore services Without automation With automation Fault repair Fault repair Travel time to site Manual switching Fault isolation Travel time to site Travel to site Fault isolation Fault repair Travel to site Fault isolation Fault identification Fault identification Fault identification

20 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

21 Quality of service & automation Quality of Service Automation Direct Indirect Fault location & isolation Sectionalising MV Monitoring CAPEX PEX Service & maintenance Service restoration Voltage control LV Monitoring Key Performance Indicators System design

22 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

23 Future considerations Communications is key Variety and structure of communications Management of vegetation Building developments / planning

24 Future considerations Continue to be prepared Reinforce the working relationships Location of sites Equipment kits utages Installation & commissioning spares

25 Electricity Company of Ghana Lucy Electric