Consulting Services for Rehabilitation of the HPP Trebinje 1-Phase III, Bosnia and Herzegovina

Client: KfW, Germany and HET - Hidroelektrane na Trebišnjici, Bosnia and Herzegovina
Name of partner(s): Tractebel Engineering GmbH (former Lahmeyer International), Germany - Main Contract holder
Start/Completion Date: July 2014-Ongoing project (ETA 2021)
Project description: HPP Trebinje I is in operation since 1968 and requires modernization. The German Development Bank KfW and EPRS jointly provide funds for the implementation of a three-phase rehabilitation program. In Phase I instrumentation, control and excitation systems have been rehabilitated. Phase II covered auxiliary mechanical systems (cooling water system, drainage system, compressed air system) and electrical equipment (step-up transformers, auxiliary transformers, 14.4 kV switchgear and generator circuit breakers, Is limiter, 35 kV switchgear, 220 kV switchgear). The Consultant was contracted for consulting services and supervision of the project implementation. The objective of Phase III is to rehabilitate and modernize the following equipment of units no.1, 2 and 3:

• Generators;
• Turbines
• Selected hydraulic steel structures (stop logs and gate drives, butterfly valves, penstocks)
• Interface Systems (control system, electrical protection system, vibration monitoring system, off-line PD measurement system, excitation system, motor control centres, inert gas fire protection system, instrument transformers).

The Main Project Characteristics are:

• 3 x Francis turbines: rated turbine output - 54.5 MW, net head - 86.5 m, discharge - 3 x 70 m³/s
• 3 synchronous generators: unit 1, 2, each - 60 kVA, unit 3 - 70 KVA
• 1.3 billion m³ storage volume of Bileca reservoir

Following services have been executed:

• Determination of required tests specification of test and drafting of inquiries to testing institutes (Inspection tests of generators in all operating regimes, Checking and inspection tests of generator stator Checking and inspection tests of generator rotor, Checking of generator bearings, Checking of stop logs drive and gates drive, Checking of penstocks,8 Checking of butterfly valves and bypass, inspection tests of spiral cases and wicket gates, inspection tests of turbine runners, inspection tests of turbine shafts, inspection tests of wicket gates servomotors and regulating rings servomotors, Measurement of turbine efficiency, inspection tests of turbines dynamic characteristics);
• Evaluation of the test results and preparation of an Investigation Report incl. final recommended recommendation of measures to be implemented in Phase Ill/rehabilitation concept;
• Elaboration of tender documents (incl. ECA coverage);
• Bid evaluation and assistance in tendering;
• Assistance to the PEA in the contract negotiations with the most responsive bidders
• Review and Approval of Contractor’s Design;
• Witnessing of Factory Acceptance Tests;
• Supervision of the rehabilitation works and regular visits to HPP Trebinje I;
• Project Monitoring (cost control, issue of PAC);
• Advisory services for the operational personnel after commissioning;
• Preparation of quarterly progress reports and a final project completion report;
• Conduct an Energy Study to elaborate new operation characteristics, considering new build, planned or changed up-stream and downstream hydro power plants as well as new market conditions.