Supply · Sikkim
Solar & Inverter Duty Transformers in Sikkim
Up to 20 MVA. Delivery across Sikkim about 6 days by road, built to the specification your utility or project issues.
Tanks awaiting core-and-coil assembly
Logistics and network
Supplying Sikkim.
Deliveries across Sikkim start at about 1520 km by road, which puts the nearer cities (Namchi, Gangtok) within 6 days of dispatch. The state's demand centres on Gangtok, pharmaceutical units at Rangpo and Namthang, hydro projects.
Distribution in Sikkim is handled by Energy and Power Department, Sikkim; Energy and Power Department runs the transmission network. Programmes now in execution include RDSS, and each is tendered against a technical specification that we quote and manufacture to.
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 Sikkim.
- Design ambient 35 °C hill climate; seismic classification Zone IV for structures and foundations.
- Inland exposure: standard epoxy-polyurethane exterior finish and hot-dip galvanized steel parts.
- Temperature rise 45 K winding and 40 K top oil over the stated ambient, or 55 K / 50 K where Energy and Power Department specifications allow; losses, impedance and tapping to the utility schedule or IS 1180 level.
Questions
Frequently asked.
How long does delivery of Solar & Inverter Duty Transformers to Sikkim take?
Can you build to the Energy and Power Department specification?
Do you supply private buyers and contractors across Sikkim, not only utilities?
Send us your Solar & Inverter Duty Transformers schedule for Sikkim.
Ratings, quantities, the specification you are buying against and the delivery point. We return a quotation with a firm delivery programme.