Nigerian distribution runs on 33/11 kV networks operated by the DisCos under TCN’s transmission backbone, and the everyday engineering reality is a supply that sags, spikes and cuts. Equipment for this market is therefore specified more heavily than the nameplate suggests: wide tap ranges to track a drifting supply voltage, robust impulse levels, and enclosures that survive both the harmattan dust and the coastal humidity of Lagos.
Grid Context and Standards
The network is 50 Hz with 415/240 V low-voltage supply. Distribution transformers are typically 11/0.415 kV and 33/11 kV, and IEC 60076 is the reference for ratings and testing. Because supply voltage varies widely by feeder, we review the tap range as a first-order item rather than a default — a unit set for a nominal 11 kV may spend its life at 9.6 kV.
What We Supply
- Oil-immersed distribution transformers from 250 kVA to 16 MVA for 11 kV and 33 kV networks.
- Compact substations combining transformer, MV switchgear and LV board for estates, campuses and industry.
- Ring main units for 11 kV loop networks feeding residential and commercial districts.
- MV switchgear and LV distribution boards matched to the single-line diagram.
SONCAP and Export Documentation
Shipments to Nigeria clear under the SONCAP regime, which requires a Product Certificate and a SONCAP Certificate for the consignment. We do not hold these certificates as standing items; we support them per project — test reports from IEC 60076 routine testing, factory audit support where the scheme requires it, and coordination with the inspection agent nominated for the shipment. Crating is specified for sea freight and quoted FOB, CFR or CIF.
Design Points for Nigerian Sites
- Wide off-circuit or on-load tap ranges, sized to the feeder voltage profile rather than to the nominal rating.
- High ambient design for 40 °C-plus conditions, with cooling sized so the unit holds rating in the afternoon peak.
- Sealed-tank or conservator options reviewed against maintenance practice on site — a transformer that will not get oil sampling deserves a sealed tank.
- Enclosure protection and filtration against harmattan dust for outdoor rooms.
Frequently Asked Questions
Do you supply SONCAP certificates with the transformer?
We support the SONCAP process per shipment with IEC 60076 test reports, audit support and coordination with the nominated inspection agent; the certificates are issued against the consignment.
Which products suit 33/11 kV injection substations?
Oil-immersed transformers from 250 kVA to 16 MVA with MV switchgear and ring main units, supplied together or as separate scope.
What is the lead time?
Standard lead time is 30 days from drawing approval, with a two-year warranty.
Start an Enquiry
Send the single-line diagram, the load list and the site conditions, and we will come back with a proposed arrangement, the applicable standard set and a quotation on FOB, CFR or CIF terms. Email info@xsdfftransformer.com, call +8615867897761, or message WhatsApp +852 5416 2620.