Supply · West Bengal
Solar & Inverter Duty Transformers in West Bengal
Up to 20 MVA. Delivery across West Bengal about 6 days by road, built to the specification your utility or project issues.
Tanks awaiting core-and-coil assembly
Logistics and network
Supplying West Bengal.
Deliveries across West Bengal start at about 1530 km by road, which puts the nearer cities (Siliguri, Asansol, Durgapur) within 6 days of dispatch. The state's demand centres on Kolkata and Haldia port and petrochemicals, Durgapur and Asansol steel, Howrah foundries and engineering, Siliguri, Kharagpur.
Distribution in West Bengal is handled by WBSEDCL, with CESC in Kolkata; WBSETCL runs the transmission network. Programmes now in execution include RDSS, WBSEDCL rural feeder works, 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 West Bengal.
- Design ambient 45 °C humid; seismic classification Zone IV (north) for structures and foundations.
- Coastal and industrial exposure: C5-M grade exterior paint, stainless or hot-dip galvanized hardware and heavier zinc coating on steel parts for sites near the coast.
- Temperature rise 45 K winding and 40 K top oil over the stated ambient, or 55 K / 50 K where WBSEDCL 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 West Bengal take?
Can you build to the WBSEDCL specification?
Do you supply private buyers and contractors across West Bengal, not only utilities?
Send us your Solar & Inverter Duty Transformers schedule for West Bengal.
Ratings, quantities, the specification you are buying against and the delivery point. We return a quotation with a firm delivery programme.