Electrical & electronic engineering · Bhubaneswar, Odisha
Engineering power from copper to silicon.
Angstrom Semiconductor manufactures distribution transformers, designs, tests and validates semiconductor circuits, and builds panel boards for every kind of industry. One engineering team, accountable from the first calculation to the final routine test.
Transformer manufacturing
Oil-immersed distribution transformers wound, assembled and routine-tested in-house.
Explore transformers → DIVISION · ELECTRONICSSemiconductor & circuit design, testing and validation
From schematic and simulation to prototype bring-up, stress testing and compliance.
Explore electronics → DIVISION · CONTROLPanel boards for all industries
PCC, MCC, APFC, VFD and automation panels engineered for the duty they will see.
Explore panel boards →Division 01 · Power
Distribution transformers, built to carry the load for decades.
Every Angstrom transformer starts with a loss calculation and ends on the test bench. We wind with high-conductivity copper or aluminium, use CRGO core steel, and dry each active part under vacuum before it meets the oil.
| Rated power | 25 · 63 · 100 · 160 · 200 · 250 · 315 · 400 · 500 kVA |
|---|---|
| Voltage ratio | 11 000 / 433 V, off-circuit taps ±5% in 2.5% steps |
| Vector group | Dyn11 |
| Frequency · phases | 50 Hz · 3φ |
| Cooling | ONAN |
| Windings | Electrolytic copper or EC-grade aluminium |
| Core | CRGO silicon steel, step-lap |
| Built to | IS 1180 (Part 1), IEC 60076 |
Oil-immersed distribution
Pole and plinth-mounted units for DISCOMs, campuses and industrial feeders.
Solar & inverter-duty
Windings and shielding designed for inverter harmonics and daily thermal cycling.
Isolation & control
Single and three-phase isolation transformers for machines, panels and clean power.
Special ratings
Non-standard voltages, ratios and losses engineered to your specification.
How a transformer leaves our shop floor
Division 02 · Electronics
Semiconductor and circuit design, tested until it holds.
We design boards and circuits, then try hard to break them. Simulation, prototype bring-up, environmental stress and EMC pre-compliance happen under one roof, so a design reaches production with evidence behind it.
What we take on
Design
Analog, digital and power circuits. Schematic capture, component selection and derating.
Layout
Multilayer PCB layout to IPC-2221 with controlled impedance and thermal relief.
Simulation
SPICE, signal and power integrity, and thermal models before copper is ordered.
Bring-up
First-article assembly, power-on sequencing, firmware hooks and debug.
Test
Functional, boundary-scan and parametric tests with fixtures we build ourselves.
Validation
Thermal cycling, vibration, HALT and EMC pre-compliance with written reports.
Division 03 · Control
Panel boards for every kind of industry.
A rolling mill, a hospital and a solar plant ask very different things of a panel. We start from your single-line diagram and the site conditions, then design the busbar, segregation and protection to suit, verified to IEC 61439.
We design low-voltage panels with incomers up to 4000 A, choose the form of internal separation for safe maintenance, and type the enclosure to the dust, water and heat on your site. Wiring is ferruled and tagged to the drawing, and every panel is tested before dispatch.
Power control centre
Main LT distribution from transformer or DG.
Motor control centre
DOL, star-delta and soft-starter feeders.
Power factor correction
Automatic capacitor banks with detuned reactors.
Drive panels
Variable frequency drives with harmonic filtering.
Automation
PLC, HMI and SCADA-ready control panels.
DG & synchronising
Auto mains failure and multi-DG sync panels.
Distribution boards
Main and sub-distribution for buildings.
Metering
Utility and energy-audit metering panels.
Bus ducts
Transformer-to-panel busbar trunking.
Who we work for
Industries we power and control.
Filter by sector to see what we typically supply. Tags show which division is involved: TX transformers, EL electronics, PN panel boards.
Engineering tools
Work out what you need before you call.
Size a distribution transformer or build a panel specification in a minute. Send either result straight into the quote form below.
Indicative sizing. Final rating also considers load diversity, motor starting, harmonics and ambient temperature.
| Required capacity | — |
| HV full-load current | — |
| LV full-load current | — |
| Day-one loading | — |
Our engineers confirm busbar sizing, short-circuit rating and device make against your single-line diagram.
About Angstrom
An ångström is a ten-billionth of a metre. That is the standard we hold ourselves to.
Angstrom Semiconductor Pvt. Ltd. is an electrical and electronic engineering company in Bhubaneswar, Odisha, and part of the 3SD group of companies. We bring heavy electrical manufacturing and fine electronics validation into one team, so customers who need a transformer, a control panel and the electronics inside it deal with one accountable engineer.
Debabrata Bhuyan
Over eighteen years in engineering, from Mindtree to six years at Bosch on automotive fuel injection systems and three as Bosch's onsite manager in Germany. Founder of 3SD Solutions and Services and director of Angstrom Semiconductor.
Precision by measurement
Losses, ratios and impedances are recorded on a routine test report shipped with every unit.
Designed for the duty
We design for your load profile, harmonics and site, then size the equipment to it.
Standards first
IS 1180, IEC 60076, IEC 61439 and IPC are where our drawings begin.
One accountable team
Power, control and electronics engineers sit together, so interfaces do not fall between vendors.
After-sales that answers
Commissioning support, spares and periodic testing across Odisha and India.
Questions buyers ask
Frequently asked questions
What transformer ratings does Angstrom Semiconductor manufacture?
Oil-immersed distribution transformers from 25 kVA to 500 kVA at 11 kV / 433 V, vector group Dyn11 with ONAN cooling, built to IS 1180 and IEC 60076. Other voltages and ratings are engineered on request.
Which tests are carried out on every transformer?
Every unit goes through routine tests per IS 2026 / IEC 60076: winding resistance, voltage ratio and vector group, no-load loss and current, load loss and impedance voltage, insulation resistance, and separate-source and induced over-voltage withstand tests. The results ship with the transformer.
What semiconductor and circuit services do you offer?
Schematic capture, PCB layout, SPICE and thermal simulation, signal and power integrity, prototype bring-up, functional and boundary-scan test, thermal cycling and environmental stress, EMC pre-compliance, and reliability and failure analysis.
What types of panel boards do you design?
Power control centres (PCC), motor control centres (MCC), APFC panels, VFD panels, PLC and automation panels, AMF and DG synchronising panels, main and sub distribution boards, and metering panels, designed and verified to IEC 61439.
Which industries do you serve?
Steel and metals, mining, cement, power utilities and DISCOMs, solar and renewables, commercial buildings, hospitals, data centres, railways and metro, water and wastewater, automotive and EV, pharmaceuticals, food processing and electronics OEMs.
How do I size a distribution transformer?
Divide the connected load in kW by the power factor to get kVA, add a margin for future growth, divide by your target loading (typically 80%), and choose the next standard rating. The sizing calculator above does this and shows HV and LV full-load currents.
Where is Angstrom Semiconductor located?
We are based in Bhubaneswar, Odisha, India, and supply customers across Odisha and the rest of India. Electronics design and validation work is also taken up for customers outside India.
Request a quote
Tell us what you are building.
Share a single-line diagram, a load list or a board schematic if you have one. An engineer replies within one working day.