State-owned engineering major Bharat Heavy Electricals Limited (BHEL) has invited bids to provide operations and maintenance support services for a 50 MW solar project it set up for NTPC in Madhya Pradesh. The plant is part of 250 MW of grid-connected capacity established by NTPC, on EPC basis, in Mandsaur District.
The selected bidder shall be responsible for operations and maintenance of the complete plant for a period of 38 months. During the contract period, the contractor has to carry out activities in a phased manner as required by BHEL and the program of milestone events.
The work is tentatively scheduled to commence in November 2019 and complete by December 2022.
To be eligible, the bidder should have successfully executed at least one similar work of value not less than Rs 177 lakh, or at least two similar works of value not less than Rs 111 lakh each, or at least three similar works of value not less than Rs 89 lakh each.
Further, the bidder must have achieved an average annual financial turnover of Rs 67 lakh or more over last three completed financial years, i.e., 2015-2016, 2016-17 and 2017-18.
The PV modules at the power plant generate DC electricity, which, in turn is inverted to 3-phase AC with 350V. The voltage is further stepped up to 33 KV using 2.5 MVA transformers. Twenty such transformers are employed to achieve 50 MWp.
String monitoring boxes (SMBs) are employed to monitor DC parameters of solar array strings. The DC power outputs from the SMBs are fed to 40 numbers of 1250 KW grid-interactive power conditioning units (inverters) that are housed in a distributed manner among 10 inverter rooms and one central monitoring and control station room. The inverter rooms, each generating 5 MWp, are placed at different locations of the power plant.
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