1. Background:
The Mozambique Transmission Company – MOTRACO – is a limited liability company incorporated in the Republic of Mozambique in 1998. The company is a joint venture between Electricidade de Moçambique (EDM), Eskom Holdings (Eskom), and Eswatini Electricity Company (EEC). MOTRACO was created as a vehicle for co-operation with the primary objective of building, owning, operating, and maintaining the transmission system, and supplying electricity to the Mozal aluminium smelter in Mozambique and wheeling power to EEC and EDM.
2. Context and Description:
Maputo Substation is a 400kV Substation with 2 X 400kV incoming Transmission lines, 4 x 500MVA and 2 x 400MVA transformers. The Substation was built in 1998 and has been upgraded over the years by the addition of primary and secondary plant equipment, which demands more DC system, specifically for the backup system.
Currently, the ideal 12-hour DC backup (as per Eskom Standard) no longer exists and an upgrade is required. Currently, the backup time is around 5 hours.
A survey was conducted to determine the new specifications for the new batteries and charger to cater to the current and future Substation’s load, as per the attached spreadsheet. The existing batteries and charger’s specifications are comprised of:
| 110 VDC | 48 VDC |
|---|---|
|
MAIN 1 CHARGER: STATIC POWER 110V 100AType: 3V110100/C006 SN: 160090 Battery type: 52 X FCP21 INPUT: 380 VAC, 25 A OUTPUT: 110 VDC, 100 A Load/Bat: 52 LA, Continuous CORDEX Controller rack model CXC 125/220 VDC CORDEX Rectifier CXRF 125-4.4kW (x4) MAIN 2 CHARGER: STATIC POWER 110V 100AType: 3V110100/C006 SN: 160092 Battery type: 52 X FCP21 INPUT: 380 VAC, 25 A OUTPUT: 110 VDC, 100 A Load/Bat: 52 LA, Continuous CORDEX Controller rack model CXC 125/220 VDC CORDEX Rectifier CXRF 125-4.4kW (x4) Battery/Charger Cable to be Supplied (mm2) |
CHARGER: STATIC POWER 48V 100AType: 3V048100/C001 SN: 160093 Battery type: 24 X FCP35 INPUT: 380 VAC, 19 A OUTPUT: 48 VDC, 100 A Load/Bat: 24 L.A, Continuous CORDEX Controller rack model CXCR CORDEX Rectifier CXRF 65-3.3kW MAIN 2 CHARGER: STATIC POWER 48V 100AType: 3V048100/C001 SN: 160094 Battery type: 24 X FCP35 INPUT: 380 VAC, 19 A OUTPUT: 48 VDC, 100 A Load/Bat: 24 LA, Continuous CORDEX Controller rack model CXCR CORDEX Rectifier CXRF 65-3.3kW (x3) 70 |
Note: Battery specification attached Excel spreadsheet.
| Input Length of Cable from Battery to Charger (max 30 meters) | 25 |
|---|---|
| Charger size to be Supplied (A) | 200 |
| Battery Capacity to be Supplied (A/H) | 608 |
| Battery/Charger Cable to be supplied (mm2) | 120 |
Note: Battery specification attached Excel spreadsheet.
3. Scope of Work:
The bidders are required to submit an offer for the Supply and Installation of new batteries and chargers, considering two options:
- Option 1: Supply and installation of new batteries and upgrade the existing charger from 100A to 300A.
- Option 2: Supply, Installation, and commissioning of completely new batteries and a set of chargers.
For both options, the bidders must include and specify all the changes/upgrades that need to be done on the DC distribution board, internal wiring, AC Inputs, protection circuits, etc.
Inspect battery room space availability and advise all changes/upgrades or improvements that need to be done for the installation of new batteries to ensure the environmental condition and safety of personnel and equipment.
All works, specifications, and personnel must follow ESKOM – NORTHEAST GRID Standard.
4. Format of Proposal:
4.1. The proposal must be detailed and present the following:
- Separated quotes for Option 1 and Option 2 considering all Scope of Work;
- BoQ for both options to be provided by the contractor;
- Labour rates and team composition;
- Project plan for both options;
- ESKOM – Northeast Grid Authorisation for the person who will supervise and take permit;
- Any additional cost.
4.2. Bidders shall submit the following documents:
- Company profile;
- Track record and experience on similar work, including reference letters;
- Company registration documents and supporting documents;
5. Clarifications:
All clarifications shall be submitted by email to MOTRACO to the attention of:
- Name: Virgilio Laisse, Operations Engineer
- Email: Vlaisse@motraco.co.mz
- Cc: esitoe@motraco.co.mz
6. Site Visit:
A site visit is scheduled for 10:00 on July 15, 2024, at Maputo Substation, where bidders will be able to access the battery room where the equipment is placed and take measurements if necessary.
7. Closing Date:
The proposals must be submitted no later than 12:00 on July 28, 2024.
Regards