Supply · Laos
Solar & Inverter Duty Transformers in Laos
Up to 20 MVA. Manufactured in India to IS and IEC standards and shipped to Laos: Ex Factory or FOB Nhava Sheva; CIF Laem Chabang on request.
Tanks awaiting core-and-coil assembly
Logistics and network
Shipping to Laos.
Consignments for Laos move Sea from Nhava Sheva to Laem Chabang (Thailand), then road via Nong Khai to Vientiane; or via Da Nang (Vietnam) for the south. Typical transit is 12 to 18 days to port, 3 to 6 days road; discharge at Laem Chabang (Thailand) or Da Nang (Vietnam), then road. We quote Ex Factory or FOB Nhava Sheva; CIF Laem Chabang on request, with payment by LC at sight or advance, USD.
The grid runs at 50 Hz with 400/230 V low-voltage supply and 22 kV distribution as the national standard, with 35 kV in some provinces and 12.7 kV single-wire rural lines; 115 kV transmission. Distribution is operated by Electricite du Laos (EDL) and EDL-Transmission, regulated by Ministry of Energy and Mines. Import conformity: EDL technical specifications and type-test certificates; IEC standards.
The product
A solar transformer is not a distribution transformer with a different label.
An inverter feeds the transformer a non-sinusoidal current with significant harmonic content, and it does so on a duty cycle that is de-energised for roughly half the year. Both facts change the design.
Harmonic currents drive eddy-current heating in the windings that a standard design does not allow for, so conductors are transposed and the core flux density is de-rated to leave headroom. The overnight de-energised period means no-load loss dominates lifetime energy cost far more than it does on a distribution feeder — which is why the low-no-load-loss design is worth paying for here and not always elsewhere.
| Parameter | Specification |
|---|---|
| Rated power | Up to 20 MVA |
| HV voltage | 11 kV or 33 kV |
| LV voltage | 315 / 380 / 415 / 480 / 600 / 690 / 800 V — the inverter output, not 433 V |
| Winding arrangement | Two, three or more secondaries; dual secondary is the norm |
| Duty | Step-up, outdoor, solar or wind generation |
| Frequency | 50 Hz standard; 60 Hz for export |
Specifying
What changes for Laos.
- Climate and site: Tropical monsoon, 40 °C with high humidity; mountainous north.
- Built to IEC 60076 for 50 Hz, with insulation levels for the 22 kV distribution as the national standard, with 35 kV in some provinces and 12.7 kV single-wire rural lines and 400/230 V secondaries; temperature-rise limits and cooling sized for the stated ambient and altitude.
- Fittings, bushings and tap-changer ranges follow the utility specification (Electricite du Laos (EDL) and EDL-Transmission); type-test certificates from CPRI or ERDA accompany the offer.
- Documentation: commercial invoice, packing list, certificate of origin, test certificates and the import conformity certificate where Laos requires one.
Questions
Frequently asked.
How long does delivery of Solar & Inverter Duty Transformers to Laos take?
What documents and certificates come with a consignment to Laos?
Which standard and voltage class do you build to for Laos?
Send us your Solar & Inverter Duty Transformers schedule for Laos.
Ratings, quantities, the specification you are buying against and the delivery point. We return a quotation with a firm delivery programme.