Following projects have been done and in progress under Grid substation Construction Projects unit
Construction of 33kV Feeders at Sapugaskanda Grid Substation
In line with the installation of Capacitor Banks by Clean Energy and Network Improvement Project – Package 02 (CENEIP – P2) at Sapugaskanda Grid Substation, it has been identified the requirement of construction of Two (02) 33kV Feeder Bays at the Substation. This was also assigned to GSCP unit and projects was completed in February 2019.
Construction two number of 220kV Line Bays at New Anuradhapura Grid Substation
Construction 220kV transmission line from Mannar Grid Substation via Vavuniya 220kV Grid Substation terminating at New Anuradhapura Grid Substation was entrusted with GSCP unit to improve reliability and flexibility of the operation. Project was completed in 2019.
Augmentation of Pannala GSS.
Pannala GS was proposed to augment the Pannala GSS by adding another 132/33kV, 31.5MVA transformer to cater the unexpected growth of electricity demand around Pannala area recently, mainly demands are requested for bulk supply connections for the factory being constructed in the industrial zone and for the national development projects being implemented. The projects was completed in November 2019. Total expenditure is 65 MLKR.
Installation of 100 MVAr Reactor at New Anuradhapura GS and 50 MVAr Reactors at Mannar GS
Under the Grid Substation Construction Projects Unit, installation of 100 MVAr Reactor at New Anuradhapura GS and 50 MVAr Reactors at Mannar GS was launched to maintain the 220kV system voltage which reaches above the specific valve due to the excess reactive power owing to the transmission line charging. This project was commenced on August 2019 and will be completed in March 2021. The Total cost for the Project is LKR 1,374.69 M.
Figure-22: 100 MVAr Reactor at New Anuradhapura GS and 50 MVAr Reactors at Mannar GS Work
Construction of Wagawatta Grid Substation
Wagawatta and Millaniya areas, located in the Western province have been identified as a strategic location for large scale industrial development projects. Board of Investment of Sri Lanka (BOI) has requested Ceylon Electricity Board (CEB) to provide 30MVA power supply for Wagawatta industrial zone and 25MVA power supply for Millaniya proposed industrial zone. Since two industrial zones are within 15-20 km distance apart, it was decided to construct the new grid substation at Wagawatta considering land availability and other basic infrastructure facilities. BOI has agreed to provide required funds for the construction of new grid substation at Wagawatta. The estimated cost for the Construction of new Wagawatta Grid Substation is LKR 1898 Mn. This project is in progress and it will be Completed in December 2021.
Construction of 02 Nos. of 220kV double bus bars Transmission Line Bay at New Polpitiya Switching Station
In order to connect Hambanthota 220 kV double circuit transmission line to new Polpitiya GS Construction of 02 Nos. of 220kV double bus bars Transmission Line Bay was commence. This project is in progress and it will be Completed in October 2020.
Construction of Two (02) 33kV Feeder Bays at Ratmalana Grid Substation
In order to connect 10MW power from the proposed Karadiyana Waste Power Project to National Grid, the existing 33kV GIS in Ratmalana Gird Substation shall be expanded with two (02) additional bays. This project is in progress and estimated cost 147.9 MLKR.
Extension of Kelenitissa 132kV GIS
Extension of Kelanitissa 132kV GIS has been carried out in order to connect three (03) gas turbines under Kelanitissa New Gas Turbine Project (KNGTP). This project is in progress and estimated cost 465 MLKR.
Following projects have been done under Transmission Line Construction Projects unit
The 132kV double circuit transmission line from Bolawatte Grid Substation to New Chillaw Grid Substation is of Lynx conductor had been built in 1963. To improve current carrying capacity and reliability of the line, it was proposed to enhance the capacity of the New Chillaw – Bolawatte 22km, 132kV transmission line section with double circuit, Zebra transmission line. The above project was implemented in two stages. First stage, 132kV line from New Chillaw GSS to Pannala GSS was completed and energized in March 2018. Second stage, 132kV transmission line from Bolawatte GSS to Pannala GSS was completed and energized on March 18, 2019.
Figure 1, 2, 3: Reconstruction of New Chillaw – Bolawatte 132kV Transmission line
Biyagama - Kotmale 220 kV Double Circuit Twin Zebra transmission line is 70.5 km in length and commissioned in 1985. In May, 2017 most of the areas in the wet zone of the country experienced heavy rainfalls compared to other years and incidents of landslides were reported in several places of the country. Bulathkohupitiya was one such area and above transmission line is also travelling in the vicinity where the landslide had taken place. Therefore, it was decided to take remedial actions to mitigate the damages to the power line by performing necessary modifications to the affected line section. As an immediate solution erection of two numbers of single circuit temporary towers after removing Tower No 75 by the Transmission Operation and Maintenance (O&M) branch.
As a Permanent Solution TLCP was assigned with erection of TD1+27 tower and TD1+18 tower and transfer the line near Tower No. 75 of Biyagama – Kotmale 220kV transmission line. This was completed in September 2019 in extreme weather conditions with the dedication of the TLCP staff.
Figure 4, 5: Biyagama - Kotmale 220 kV Transmission line – Reconstruction works at Bulathkohupitiya
Kerawalapitiya - Kotugoda 220kV transmission line has been constructed during the period of year 2007-2008. The line mainly traverses over the Muthurajawela marshy land and most of the towers have pile foundations. Damage occurred to tower No 10 (suspension tower) located at the Kerawalapitiya due to excessive land filing in marshy area under solid waste processing plant development of a land by filling soil, to be used as a clinical waste dumping yard and processing plant together with a solid waste dumping yard. TLCP was assigned with erection of a tower for replacing the damaged Tower no. 10 of Kerawalapitiya - Kotugoda 220kV transmission line at Muthurajawela. This was completed in October 2019 in extreme environmental conditions in waste dump yard with the dedication of the TLCP staff.
Figure 6, 7: Kerawalapitiya - Kotugoda 220kV transmission line – Damaged Tower and waste dump yard at Muthurajawela
Figure 8, 9: Kerawalapitiya - Kotugoda 220kV transmission line – Tower erection and stringing works at Muthurajawela