Hydro Power Plants on the Nile River Nobert Matarutse Te
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Successes achieved in terms of maintenance planning and implementation- Hydro Power Plants on the Nile River Nobert Matarutse Technical Director Eskom Uganda Limited Uganda Introduction and background • Prior to year 2001 Uganda had a vertically integrated power utility, Uganda Electricity Board, responsible for power generation, transmission and distribution of electricity. No regulatory framework was in place • Uganda Electricity Generation Company Limited was born out of the de-regulation of the electricity industry in Uganda Introduction Cont’d • De-regulation was motivated by among other reasons, the need to improve service delivery, increasing electrification rate and as a way of increasing accountability and provide a fertile environment for investment in this critical industry. Introduction Cont’d • Prior to de-regulation power industry was characterised by frequent power blackouts, trips and dwindling plant capacity and high operating costs. • Eskom Uganda Limited is a wholly owned subsidiary of Eskom Enterprises SA. It was formed in 2002 and won a 20 year concession to operate and maintain two power plants on white Nile, Uganda from 1st April 2003. Nalubaale and Kiira Power Stations • Installed Capacity Nalubaale 10 X 18MW= 180MW-Vertical Shaft Kaplan Units • Ist unit commissioned in 1954. All units uprated and refurbished in between 1992- 1998-Uprated from 15MW to 18MW each • Installed Capacity Kiira 5 X 40MW= 200MW- Vertical Shaft Propeller Units • Total Installed Capacity For Complex= 380MW • Peak Generation current 217MW due to hydrological Constraints Nalubaale and Kiira Power Stations Nalubaale PS Kiira PS Rated 18.9 20.8 Head (m) Specific 19.8 18.02 water consumpti on factor (m3/kWh) Previous Planning Philosophy • Uganda Electricity Generation Company Limited (UEGCL) being a parastatal was not bound by any Power Purchase Agreement. • UEGCL had a time based planning philosophy • UEGCL declared installed capacity and were paid based on same. • UEGCL’s planning was based on OEM’s recommendations provided soon after rehabilitation Previous Planning Philosophy • UEGCL were in charge of the complex for slightly more than 2 years during which time they used a job card system for managing routines and defects Eskom’s Planning Methodology • Time and condition based • Microsoft access based deviation management system was established • Deviation management system which is still in place is like a manual (s.c.a.d.a) system • Plant history developed by the creation of the centralised documentation center. Eskom’s Planning Methodology • Plant history so developed was key as it enabled proper trending of critical plant parameters and performance of plant. • Plant history was also utilised to kick start plant intervention programs with a view to stimulate continuous improvement. • 10 year Technical Plan and Life of Plant Plans developed. • System Engineering and modification programs established Service Level Agreements • Power Purchase Agreement • Concession and Assignment Agreement • Generation Licence • Water Permit • Support Agreement • Heads of Agreement Maintenance Philosophy • 36 monthly cycle-maintenance outage - 30days • 18 monthly cycle-detailed inspection - 15days feeds into 36 Monthly cycle maintenance • 6 monthly cycle-1day routine • Using condition monitoring schemes installed, maintenance outages are effected before breakdowns Maintenance Planning and Implementation • Outage management procedure in place • Pre and post outage planning meetings • KKS plant break down system used for physical assets identification. • Work packages-for standardisation-doing things right first time. • Annual plan submitted to system operator 120 days before the following year. • Annual plan takes into account outage scheduling Power Generation Performance Indicators • The following were and are still being measured on a monthly basis in order to guide plant performance and ensure service delivery; Power Generation Performance Indicators • Plant Availability • Plant Reliability • Unplanned Automatic Grid Separations • Planned Outage Rate • Forced Outage Rate (including Mode change failures) • Plant Load Factor • Plant Efficiency Plant Availability Benchmarks Availa Company Country bility Mighty River New Power Zealand 92.4% New Meridian Energy Zealand 94.0% British Columbia Hydro Canada 96.4% Eskom Uganda Ltd Uganda 96.0% Dropping water levels led to reduction in available energy U2 VT explosion (Trfr 11kV cable and surge arresters damaged) outage lasted over 300hrs - Unit 10 rotor earth fault – outage lasted approx 100hrs Performance Outlook • Conjunctive operation with downstream power plants. • Commissioning of an integrated computerised maintenance management system that relates to functional areas of the business. • Increased plant optimisation Performance Outlook • Improvement in manpower utilisation • Increased cost effectiveness • Further improvement in service delivery • Focus on quality assurance • Increased focus on risk management Intervention measures employed to achieve performance • replacement of dc systems • modification of protection schemes • modification of governing systems • installation of vibration monitoring • installation of partial discharge scheme • transformer replacement • circuit breaker replacement • surge arrestors replacement Intervention measures employed to achieve performance • System engineering including in-depth incident investigations. • Standardisation of maintenance tasks and procedures • Enforcement of statutory maintenance • Training and development including exposure programs. • Performance management. The End • Thank You • Siyabonga • Webale Nyo.