SG Power Products Pvt. Ltd. | Last updated: 26 October 2026
SG Power Products Pvt. Ltd. is a transformer manufacturer based in Noida, Uttar Pradesh, and a transformer supplier to projects across India. We make oil cooled distribution transformers, HT AVR transformers with on-load tap changers, LT step-up and step-down transformers, dry type transformers, and furnace transformers for industries, utilities, solar plants, buildings and infrastructure projects. Our distribution transformers are built to IS 1180 and IS 2026, with copper windings and full routine testing before dispatch.
A transformer runs 24 hours a day for 25 years or more, so its losses, winding quality and voltage stability decide the power bill and the life of every machine connected to it. An HT AVR transformer also keeps the plant voltage steady when the grid voltage swings, without a separate stabilizer.
As a distribution transformer manufacturer and transformer supplier, we build standard ratings and custom designs for new connections, capacity upgrades and replacements. EPC contractors, utilities and industry, including Indian Railways, L&T, NTPC and BHEL, have sourced electrical equipment from SG Power.
Manufacturer: SG Power Products Pvt. Ltd., Noida, Uttar Pradesh, India.
Products: Distribution, HT AVR (with OLTC and AVR relay), LT step-up and step-down, dry type and furnace transformers.
Voltage: 11, 22 and 33 kV HT to 415 V or 433 V LT, plus custom LT ratios.
Ratings: 25 kVA to 500 kVA for distribution, dry type and furnace transformers.
Construction: Step-lap CRGO core, high BDV oil and ONAN cooling, or oil-free dry type (cast resin or VPI); efficiency 98% to 99%.
Standards: IS 1180 and IS 2026, with losses designed to BEE 4-star / 5-star levels; ISO 9001:2015 certified manufacturing.
Testing: Routine tests in our in-house laboratory, with a test certificate, GA drawing and GTP for every unit.
Supply: Across India, including remote project sites.
| Item | Details |
|---|---|
| Products | Distribution transformers; HT AVR transformers (with OLTC and AVR relay); LT step-up and step-down transformers; dry type transformers; furnace transformers |
| Ratings | Distribution, dry type and furnace: 25 kVA to 500 kVA; HT AVR: 500 kVA to 10 MVA |
| Voltage class | HT: 11 kV, 22 kV, 33 kV; LT: 415 V / 433 V and custom; dry type: 11 kV and 33 kV class |
| Cooling | ONAN (oil natural, air natural) for oil filled units; air cooled, oil-free for dry type (ventilated, cast resin or VPI) |
| Winding | Copper |
| Standards | IS 1180, IS 2026; IS 11171 for dry type; losses designed to BEE 4-star / 5-star levels; ISO 9001:2015 |
| Testing | Routine tests on every unit in our in-house laboratory; type test reports |
| Documentation | GA drawing, rating plate drawing, routine test certificate, manual |
| Payment terms | Production begins on receipt of 50% advance |
| Delivery | Pan-India, including remote project sites |
A transformer is a static electrical machine that changes AC voltage from one level to another through electromagnetic induction, without changing the frequency. A distribution transformer, for example, steps 11 kV from the utility line down to 433 V so factories, buildings and pumps can use it.
A transformer does three jobs in a power system:
Changes the voltage: steps it down for use (step-down) or up for transmission or special loads (step-up).
Isolates circuits: the primary and secondary windings are separate, which limits fault spread between the HT and LT sides.
Regulates supply: with taps, an on-load tap changer or an AVR, it holds the output voltage close to the rated value.
SG Power makes five types of transformers: distribution, HT AVR, LT step-up and step-down, dry type and furnace transformers. The two tables below compare them by function, voltage regulation, rating, cooling and best use.
| Feature | Distribution transformer | HT AVR transformer | LT step-up / step-down transformer |
|---|---|---|---|
| What it does | Steps HT (11, 22 or 33 kV) down to LT (415 V or 433 V) | A copper-wound “two-in-one” unit that stabilizes the 11, 22 or 33 kV supply and steps it down, holding the LT output within ±1% | Changes one LT voltage to another, e.g. 415 V to 230 V or 415 V to 690 V |
| Voltage regulation | Off-circuit taps, ±5% or ±7.5%; OLTC on request | Automatic, on load, LT output within ±1% | Fixed ratio or off-circuit taps |
| Typical rating | 25 kVA to 500 kVA | 500 kVA to 10 MVA | 25 kVA to 2500 kVA |
| Cooling | ONAN, oil filled | ONAN, oil filled | Dry type or ONAN |
| Best suited for | Utility connections, factories, buildings, solar plants | Sites with high or low grid voltage, sensitive process loads, long feeders | Imported machines, special voltages, isolation of circuits |
Special-duty transformers we make:
| Feature | Dry type transformer | Furnace transformer |
|---|---|---|
| What it does | Steps HT down to LT with no oil; ventilated, cast resin or vacuum resin impregnated (VPI) designs | Feeds the rectifier and inverter panel of a medium-frequency (500 or 1,000 Hz) induction furnace |
| Voltage regulation | Off-circuit taps; OLTC on request | Off-circuit taps |
| Typical rating | 25 kVA to 500 kVA | 25 kVA to 500 kVA |
| Cooling | Air cooled, oil-free | ONAN |
| Best suited for | Indoor substations, fire-sensitive buildings, humid or chemically polluted sites | Induction melting in steel plants, foundries and alloy plants |
Other common ways to classify transformers:
By phase: single phase and three phase.
By cooling: oil cooled (ONAN, ONAF) and dry type (air cooled, cast resin).
By winding material: copper wound and aluminium wound.
By core: CRGO steel and amorphous metal.
We manufacture distribution, HT AVR, LT step-up and step-down, dry type and furnace transformers, so one transformer manufacturer can supply the HT connection, voltage regulation, indoor substations and process power on a project.
| Product | What it is | Best suited for |
|---|---|---|
| Distribution transformer | Three phase, oil cooled (ONAN), 11/0.433 kV, 22/0.433 kV or 33/0.433 kV, 25 kVA to 500 kVA, step-lap CRGO core, copper wound | Utility-supplied factories, commercial buildings, housing, solar and pumping |
| HT AVR transformer | Copper-wound “two-in-one” HT stabilizer and transformer for 11, 22 or 33 kV, holding the LT output within ±1%, for indoor or outdoor installation, 500 kVA to 10 MVA | Industrial plants on unstable HT supply, hospitals, data centres, process lines |
| LT step-down transformer | 415 V down to 230 V, 110 V or as specified, 25 kVA to 2500 kVA, dry type or oil cooled | Lighting, controls, imported equipment, separate LT circuits |
| LT step-up transformer | 415 V up to 690 V or as specified, 25 kVA to 2500 kVA | Motors and machines rated above 415 V, long LT cable runs |
| Dry type transformer | Three phase, ventilated, cast resin or VPI, 11 kV or 33 kV class, 25 kVA to 500 kVA, oil-free and fire-safe | Indoor substations, high-rise buildings, hospitals, malls, metro and data centres where oil is a fire risk |
| Furnace transformer | Heavy-duty transformer feeding medium-frequency induction furnace panels, 25 kVA to 500 kVA, built for high currents and frequent short circuits during melting | Steel melting shops, foundries and alloy plants |
All transformers can be supplied with options such as off-circuit tap switch, Buchholz relay, oil and winding temperature indicators, cable box or bushings, and marshalling box.
Use this quick guide to shortlist the transformer, then confirm the rating with the selection guide below.
| Your need | Recommended transformer |
|---|---|
| New HT connection (11 kV or 33 kV) for a factory or building | Distribution transformer |
| Grid voltage swings, causing trips or machine damage | HT AVR transformer with OLTC |
| Long HT feeder with high or low voltage at the end | HT AVR transformer |
| Indoor substation, basement or high-rise where oil is not allowed | Dry type transformer |
| Supply for an induction furnace | Furnace transformer |
| Imported machine rated 380 V, 400 V or 690 V | LT step-down or step-up transformer |
| Separate 230 V or 110 V supply for lighting or controls | LT step-down transformer |
| Motor or equipment rated above 415 V | LT step-up transformer |
| Solar plant feeding the grid | Distribution transformer, inverter-duty |
SG Power distribution transformers are three phase, 50 Hz, ONAN units from 25 kVA to 500 kVA for 11, 22 or 33 kV to 415 V or 433 V, with Dyn11 vector group, step-lap cores, efficiency of 98% to 99% and losses per IS 1180, designed for 50 °C ambient. Specifications for dry type and furnace transformers follow in the second table.
| Parameter | Distribution transformer | HT AVR transformer | LT step-up / step-down |
|---|---|---|---|
| Rating | 25 kVA to 500 kVA | 500 kVA to 10 MVA | 25 kVA to 2500 kVA |
| Primary voltage | 11, 22 or 33 kV | 11, 22 or 33 kV | 415 V or as specified |
| Secondary voltage | 415 V or 433 V | 415 V or 433 V | 230, 110, 690 V or as specified |
| Phase and frequency | Three phase, 50 Hz | Three phase, 50 Hz | Single or three phase, 50 Hz |
| Vector group | Dyn11 (standard) | Dyn11 (or as specified) | As specified |
| Cooling | ONAN | ONAN | Dry type / ONAN |
| Winding | Copper | Copper | Copper |
| Core | Step-lap CRGO core for low noise and low no-load loss | As distribution | NA |
| Voltage regulation | Off-circuit taps, ±5% or ±7.5%; OLTC on request | HT stabilization; LT output within ±1% | Fixed or off-circuit taps |
| Impedance | 4% (25 to 63 kVA); 4.75% (100 to 250 kVA); 5% (315 to 500 kVA) | As distribution | As per design |
| Efficiency | 98% to 98.5% (25 to 100 kVA); 98.5% to 99% (160 to 500 kVA) | NA | As per design |
| Losses | Low no-load and load losses per IS 1180; designed to BEE 4-star / 5-star levels | As distribution | As per design |
| Temperature rise | Oil 35 °C; winding 45 °C | As distribution | As per design |
| Insulation level | HV 95 kV BIL (11 kV system); LV 3 kV (1.1 kV system) | As distribution | As per design |
| Design ambient | 50 °C, 100% humidity | 50 °C, 100% humidity | NA |
| Oil and protection | High BDV oil; moisture-resistant insulation; anti-corrosion, tropicalised finish | As distribution | NA |
| Standards | IS 1180 (Part 1), IS 2026 | As distribution | IS 2026 / IS 11171 |
| Fittings | Conservator, breather, oil level gauge, OTI, WTI, Buchholz relay, cable box or bushings | As distribution, plus AVR control panel | Terminal box, enclosure IP rating |
Special-duty transformers (dry type units are designed to IEC 60076-11 and IS 11171):
| Parameter | Dry type transformer | Furnace transformer |
|---|---|---|
| Rating | 25 kVA to 500 kVA | 25 kVA to 500 kVA |
| Voltage class | 11 kV and 33 kV | NA |
| Secondary voltage | 433 V or as specified | As per furnace panel |
| Design | Ventilated, cast resin or vacuum resin impregnated (VPI) | Induction furnace duty, for medium-frequency (500 or 1,000 Hz) panels |
| Cooling | Air cooled, oil-free | ONAN |
| Insulation | Class H or E, rated 180 °C or 220 °C | Class H or E, rated 180 °C or 220 °C |
| Winding | Copper | Copper |
| Voltage control | Off-circuit taps; OLTC on request | NA |
| Duty | Indoor, continuous; fire-safe with minimal, non-toxic smoke; suits humid and chemically polluted areas | Heavy duty: high currents and frequent short circuits during melting |
| Standards | IS 11171, IEC 60076-11 | IS 2026 |
GA drawings, rating plate drawings and guaranteed technical particulars (GTP) are available on request.
To select a transformer, add up the load in kW, convert it to kVA, add 20 to 25% for growth, then match the voltages, voltage regulation, loss level and site conditions. Follow these seven steps:
Add up the load. List the connected load in kW, then multiply by a demand (diversity) factor, usually 0.6 to 0.8 for industry.
Convert to kVA. Divide the maximum demand in kW by the power factor. For example, 200 kW x 0.8 demand factor = 160 kW; 160 kW / 0.9 PF = about 178 kVA.
Add room for growth. Add about 20 to 25% for future load and choose the next standard rating. In the example, 178 kVA plus 25% is about 222 kVA, so a 250 kVA transformer fits.
Confirm the voltages. Match the primary to the utility supply (11, 22 or 33 kV) and the secondary to the equipment (433 V, or a special LT voltage through a step-up or step-down transformer).
Decide on voltage regulation. If the grid voltage swings enough to trip drives or damage machines, or the load is sensitive, choose an HT AVR transformer with OLTC instead of a separate stabilizer.
Choose the loss level. A lower-loss transformer costs more but saves energy every hour for 25 years; compare total owning cost, not purchase price.
Check the site. Plan for oil containment, ventilation, clearances and a sound earthing system, and follow the utility's approval requirements.
Special-duty transformers: for a dry type transformer, also confirm the room size, ventilation and insulation class. For a furnace transformer, share the furnace type, capacity in tonnes, power rating and the furnace panel maker's input requirement.
Our application engineers can size the transformer for your load and supply. We also supply servo voltage stabilizers, chemical earthing electrodes for transformer neutral and body earthing, and lightning arresters for the substation.
Buying from a transformer manufacturer, not a trader, gives you control over winding material, losses, testing and documents for utility approval. These are the reasons EPC contractors, industries and developers choose SG Power.
Low losses, low noise. Step-lap CRGO cores cut noise and no-load losses for 98% to 99% efficiency, and every unit is designed for 50 °C ambient and 100% humidity.
Five transformer types, one supplier. Distribution, HT AVR, LT step-up and step-down, dry type and furnace transformers come from one manufacturer, with matching designs and documents.
Built-in voltage regulation. HT AVR transformers hold the plant LT voltage within ±1% on load, removing the need for a separate HT or LT stabilizer.
Routine tested before dispatch. Every unit passes ratio, resistance, insulation, no-load and load loss, and voltage withstand tests in our in-house laboratory, with a test certificate.
Utility-ready documents. GA drawings, GTP and test certificates are prepared for DISCOM and consultant approval.
Complete substation package. Transformers with lightning arresters, earthing electrodes, earthing strips and earth pit covers, designed to work together.
After-sales and site support. Our engineers handle testing and commissioning, annual maintenance contracts (AMC) with priority response, and repairs at our testing and repair facility.
Certified, registered manufacturer. SG Power is an ISO 9001:2015 certified organisation, registered with MSME and SSI, and has received CE certification.
Every SG Power transformer goes through the same controlled steps, from design to dispatch:
Design: electrical and mechanical design to your kVA, voltages and loss limits, with GA drawing and GTP for approval.
Core building: CRGO steel laminations cut and stacked to keep no-load losses low.
Winding: copper HT and LT windings wound and insulated, or cast in resin for dry type transformers.
Core-coil assembly and drying: the active part is assembled and dried in an oven to remove moisture.
Tanking and oil filling: oil is filled under vacuum in oil cooled units, and fittings are mounted.
Routine testing: ratio, resistance, vector group, no-load and load losses, insulation resistance and voltage withstand tests on every unit.
Painting and dispatch: painted, marked with the rating plate and dispatched with the test certificate.
| Certification / approval | Details |
|---|---|
| Quality management | ISO 9001:2015 certified organisation |
| Company certifications | CE certified; RoHS compliance certificate No. UQ-2024081715 (UKCert, valid to 16 August 2027) covering SG Power’s servo stabilizers, rectifiers, surge protection, earthing and lightning protection products |
| Design standards | Manufactured in accordance with Indian Standards: IS 1180 for distribution transformers, IS 2026 for power transformers and IS 11171 for dry type transformers |
| BEE energy efficiency | Distribution transformers designed to meet 4-star / 5-star energy performance levels, with no-load and load losses within IS 1180 limits |
| In-house testing laboratory | Fully equipped in-house laboratory; routine tests on every unit before dispatch, with a test certificate |
| Business registrations | MSME and SSI registered |
SG Power is a transformer supplier to industries, utilities and project sites across India, from metro cities to remote solar parks.
Standard ratings: common distribution ratings are built to a regular schedule.
Custom designs: special voltages, OLTC and AVR, dry type and furnace transformers, and custom fittings are built to order.
Safe transport: units are dispatched filled with oil and braced on trailers.
Complete documentation: test certificate, GA drawing, GTP and manual come with each unit, ready for approval.
Clear commercial terms: production starts on receipt of 50% advance; balance terms are agreed per order.
As a transformer supplier in Delhi NCR, we deliver quickly from Noida to Delhi, Ghaziabad, Gurugram and Faridabad.
SG Power is a transformer manufacturer and supplier based in Sector 62, Noida. Being in Noida, close to Greater Noida, Ghaziabad and Delhi, means faster site visits, quicker delivery and easier factory inspections for buyers in Delhi NCR. Our engineers visit sites across the region to check loads, voltages and installation conditions before we quote.
Two transformers with the same kVA can differ widely in losses, winding material and build quality, and the difference shows in the power bill and in failures years later. Use these checks to compare transformer manufacturers and suppliers.
| What to check | Why it matters |
|---|---|
| Guaranteed no-load and load losses in writing | Losses cost money every hour for 25 years or more |
| Energy efficiency level (BEE) and BIS marking | Utilities and tenders often require them for distribution transformers |
| Winding material (copper or aluminium) | Affects losses, size, overload capacity and repairability |
| Routine test certificate for every unit | Proves ratio, losses and insulation before the unit reaches site |
| Type test reports from a recognised lab | Shows the design withstands impulse, temperature rise and short circuit |
| OLTC make and AVR relay make (for HT AVR transformers) | The tap changer is the moving part; its quality decides reliability |
| Duty rating for furnace transformers | Process loads bring high currents, harmonics and frequent overloads, so the design must be rated for them |
| Insulation class and partial discharge test (for dry type transformers) | Decides the temperature rating and long-term reliability indoors |
| Manufacturer, not trader | Custom ratios, faster repairs and direct access to the designers |
| Documents for utility approval | GA drawing, GTP and test certificates speed up DISCOM approval |
| Service support and oil testing | Keeps the transformer healthy through its life |
Engineers and consultants can use this text in tender documents and BOQs. Adjust the type, rating and fittings to the project. The values in square brackets are the ones you fill in.
Design, manufacture, testing and supply of [X] kVA, [11/0.433] kV, three phase, 50 Hz, oil immersed, ONAN cooled, [copper] wound distribution transformer, vector group [Dyn11], with [off-circuit tap changer, ±5% in 2.5% steps / on-load tap changer of +X% to −X% in X steps with AVR relay and RTCC panel], losses not exceeding [energy efficiency level X of IS 1180], impedance [X]%, complete with conservator, silica gel breather, oil level gauge, OTI, WTI [and Buchholz relay], [HT and LT cable boxes / bushings], and first filling of transformer oil, conforming to [IS 1180 / IS 2026]. Routine test certificates and GA drawing to be submitted for approval. Make: SG Power or approved equivalent.
For a dry type transformer:
Design, manufacture, testing and supply of [X] kVA, [11/0.433] kV, three phase, 50 Hz, [cast resin / VPI] dry type transformer, AN cooled [with provision for AF fans], [copper] wound, vector group [Dyn11], insulation class [F], with off-circuit taps [±5% in 2.5% steps], winding temperature scanner, [IP23] enclosure and cable boxes, conforming to [IS 11171 / IEC 60076-11], with routine test certificate including partial discharge test.
For furnace transformers, we prepare tender text from your furnace data.
| Term | Details |
|---|---|
| Payment terms | Production begins on receipt of 50% advance |
| Documents | GA drawing, GTP, routine test certificate, manual |
| Warranty | As per the techno-commercial offer |
HSN code, GST rate, minimum order quantity, lead time, freight, inspection and commissioning terms are confirmed in the techno-commercial offer for your enquiry.
Transformers are used wherever power must be taken from the utility grid or changed to a different voltage.
| Sector | Typical use | Suggested transformer |
|---|---|---|
| Manufacturing plants | Main HT connection and plant power | Distribution transformer; HT AVR on unstable supply |
| Steel plants and foundries | Induction furnace supply | Furnace transformer |
| Textile, plastic and process industries | Voltage-sensitive drives and machines | HT AVR transformer |
| Hospitals and data centres | Stable supply for critical loads; indoor substations | HT AVR transformer; dry type transformer |
| High-rise buildings, malls and metro | Indoor substations where oil is a fire risk | Dry type transformer |
| Commercial buildings and housing | Building supply from 11 kV | Distribution transformer |
| Solar power plants | Inverter output to grid connection | Distribution transformer |
| Water supply and agriculture | Pumping stations | Distribution transformer |
| Imported machinery | 380 V, 400 V or 690 V equipment | LT step-down or step-up transformer |
| Railways and infrastructure | Station, depot and site supply | Distribution transformer; LT transformers |
Send us your requirement and our engineers will reply with a techno-commercial offer, guaranteed losses, a GA drawing and the delivery schedule. Please include:
Transformer type (distribution, HT AVR, LT step-up/step-down, dry type or furnace) and kVA rating; for furnace transformers, also the furnace capacity
HT and LT voltages, vector group and tapping range
Winding material (copper or aluminium) and energy efficiency level
Indoor or outdoor installation, and any utility approval needed
Site location, quantity and delivery schedule