Power Distribution Transformer — Manufacturer & Supplier in India

A Power Distribution Transformer is the most critical component between high-voltage transmission lines and your end-use electrical supply.

It steps down voltage — from 11kV, 22kV, or 33kV — to the 415V or 240V that factories, buildings, hospitals, and homes actually use.

Get this transformer wrong and the consequences are immediate — voltage fluctuation, equipment damage, production losses, and costly replacements.

Tirupati Transformers Pvt. Ltd. is an ISO 9001:2015 certified Transformer manufacturer in Greater Noida — supplying BIS-approved, IEC 60076-compliant units to utilities, industries, real estate developers, and EPC contractors across India.

What Is a Power Distribution Transformer — And Why Does Specification Matter

This transformer type converts high transmission voltage to usable distribution voltage.

It sits at the end of the power delivery chain — between the grid and the consumer. Every unit of electricity that reaches your factory or home passes through one of these units.

Unlike transmission-level units, it operates at the final distribution level — 11kV or 33kV primary.

Getting the KVA rating, vector group, cooling type, and tap changer specification right determines whether your transformer runs trouble-free for 10+ years or requires costly early replacement.

According to IEC 60076 — the international standard for power transformers — distribution-level transformers must be tested and rated for continuous duty at rated load, rated voltage, and rated frequency. Every Power Distribution Transformer from Tirupati carries full IEC 60076 routine test certificates.

Types of Power Distribution Transformers We Manufacture

Oil-Cooled Power Distribution Transformer (ONAN/ONAF)

Oil-cooled Power Distribution Transformers use mineral oil as both insulation and cooling medium.

They are the standard choice for outdoor substations, utility grid connections, industrial compound substations, and rural electrification projects.

Available in ONAN (Oil Natural Air Natural) and ONAF (Oil Natural Air Forced) cooling configurations.

Dry Type Power Distribution Transformer

Dry type units use air and epoxy resin insulation — completely oil-free.

Mandatory for indoor building substations, hospital electrical rooms, metro stations, IT parks, data centres, and any location where oil fire risk is unacceptable.

Available as epoxy cast resin (maximum protection) and VPI (vacuum pressure impregnated — cost-effective indoor solution).

BEE Star Rated Power Distribution Transformer

India’s Bureau of Energy Efficiency (BEE) Star Rating system for distribution transformers rewards units with lower no-load losses.

Our BEE Star Rated units use superior grade CRGO core — reducing iron losses.

DISCOM tenders in most Indian states now mandate BEE Star Rating for new Power Distribution Transformer procurement.

Hermetically Sealed Power Distribution Transformer

Hermetically sealed units have a completely sealed tank — no conservator, no breather.

Oil never contacts atmospheric air — moisture absorption is eliminated, oil life is significantly extended, and maintenance requirements are dramatically reduced.

Ideal for remote location installations, coastal environments, and any site where regular maintenance access is limited.

Where Power Distribution Transformers Are Used — Industries We Serve

Our Power Distribution Transformers are supplied to every major sector of India’s economy:

Utilities and DISCOMs

State electricity distribution companies — UPPCL, MSEDCL, TSSPDCL, BESCOM, WBSEDCL, and others — are our largest buyers.

DISCOM-grade units must comply with IS 1180, carry BIS certification, and meet BEE energy efficiency ratings specified in state tender documents.

Real Estate and Commercial Construction

Housing societies, commercial complexes, and IT parks all require units for their HV/LV substations.

Our units are pre-tested and supplied with all documentation required for state DISCOM connection approval.

Industrial Sector

Manufacturing plants, steel mills, textile factories, cement plants, and food processing facilities across India run on our units.

Industrial applications often require special vector groups, higher impedance for fault current limitation, or on-load tap changers for voltage regulation under variable industrial loads.

Renewable Energy — Solar and Wind

Solar power plants and wind farms connect to the grid through step-up transformers, but individual plant buildings, control rooms, and site offices need Distribution Transformers for auxiliary power supply.

Our solar inverter duty transformers serve the solar step-up application — our standard distribution transformers serve plant auxiliary supply.

Infrastructure — Metro, Railway, Airports

Metro rail projects, airport terminals, and railway stations require compact, reliable Power Transformers for station power supply.

Indoor locations mandate dry type units — our cast resin transformers are the standard specification for metro and airport indoor substation applications.

Why Our Power Distribution Transformers Rank Higher on Quality

CRGO Core — Not Ordinary Silicon Steel

Every Transformer from Tirupati uses Cold Rolled Grain Oriented (CRGO) silicon steel core — not cheaper hot-rolled alternatives.

CRGO delivers 30-40% lower iron losses than ordinary steel — directly reducing your no-load power consumption bill across the transformer’s lifetime.

Electrolytic Copper Windings

We use electrolytic-grade copper windings — not aluminium, not recycled copper blends.

Copper windings run cooler, handle overloads better, and last significantly longer than aluminium alternatives under the thermal cycling conditions of continuous Indian grid operation.

100% Pre-Dispatch Testing

Every units undergoes complete routine testing per IS 1180 and IEC 60076 before leaving our factory:

• Winding resistance measurement
• Voltage ratio and vector group verification
• Load loss and impedance voltage measurement
• No-load loss and current measurement
• Induced overvoltage withstand test
• Separate source voltage withstand test
• Oil dielectric strength test
• Tap changer operation test
• Magnetic balance test
• Oil leakage pressure test

Full test reports provided with every delivery.

ISO 9001:2015 and BIS Certification

Our manufacturing system is ISO 9001:2015 certified. Our Products carry BIS certification under IS 1180 — mandatory for DISCOM tender participation and state government project supply.

Power Distribution Transformer Price — How to Get the Right Quote

All Types of Transformer price in India depends on:

• KVA rating — 100 KVA to 10 MVA
• Voltage class — 11kV, 22kV, or 33kV primary
• Cooling type — ONAN or ONAF
• Winding material — copper (standard) or aluminium
• Tap changer — OCTC (cheaper) or OLTC (more expensive, better voltage control)
• BEE Star Rating — higher star = higher cost but lower running cost
• Special features — hermetically sealed, corrugated tank, amorphous core

Our price is the factory price — no distributor or dealer markup.

Contact us with your complete specification and receive a detailed quotation within 24 hours.

FAQs — Power Distribution Transformer

Q1. What is the difference between a Power Transformer and a Power Distribution Transformer?

A Power Transformer operates at high transmission voltages — 33kV, 66kV, 132kV, and above — at major grid substations.

A Distribution Transformer operates at the final distribution level — typically 11kV or 33kV primary, stepping down to 415V or 240V for end users.

Power transformers are larger, costlier, and designed for transmission network efficiency. Power Transformers are designed for continuous duty at distribution level — high reliability, low maintenance, and long service life.

Explore our Power Transformer range for transmission-level requirements.

Q2. What BIS standard applies to Power Distribution Transformers in India?

India’s primary standard for Distribution Transformers is IS 1180 — mandatory for all distribution transformers up to 2500 KVA used in Indian utility networks.

For transformers above 2500 KVA, IS 2026 (aligned with IEC 60076) applies.

BIS certification under IS 1180 is mandatory for DISCOM tender participation in all Indian states. Tirupati Transformers holds valid BIS licence for IS 1180 — all our distribution transformers are BIS marked.

Q3. What is BEE Star Rating for Power Distribution Transformers and do I need it?

India’s Bureau of Energy Efficiency rates Power Distribution on a 1-5 star scale based on no-load (iron) losses.

Higher star rating = lower no-load losses = lower electricity bill over the transformer’s lifetime.

BEE Star Rating is mandatory for DISCOM procurement in most Indian states — check your state’s tender document. For private industrial and commercial buyers it is optional — but a 3-star rated unit will save significantly on electricity bills over 10+ years compared to an unrated unit.

Tirupati supplies 1-star, 2-star, and 3-star BEE rated Power Transformers as standard.

Q4. What is the standard warranty on a Power Distribution Transformer in India?

Tirupati Transformers provides a standard 12-month warranty on all Transformers from the date of dispatch — covering manufacturing defects in materials and workmanship.

For DISCOM and government supply contracts, we offer extended warranty periods as specified in tender documents — typically 24 to 60 months.

All warranty claims are supported by our factory test records — every unit’s test data is retained for the warranty period.

Q5. How long does it take to deliver a Power Distribution Transformer in India?

Standard delivery time from our factory:

• 100 KVA to 500 KVA — 7 to 15 working days
• 500 KVA to 2500 KVA — 15 to 25 working days
• 2500 KVA to 10 MVA — 25 to 45 working days

Delivery timelines include manufacturing, testing, and pre-dispatch inspection. For urgent requirements, contact us with your KVA rating and delivery location — we will advise on the fastest achievable timeline based on current factory loading.

Pan-India delivery by road transport — all Indian states covered.

Get Your Power Distribution Transformer Quote — 24 Hour Response

Share your requirement with us:

• KVA rating required
• Primary voltage (11kV / 22kV / 33kV)
• Secondary voltage (415V / 240V)
• Cooling type (ONAN / ONAF)
• BEE Star Rating requirement
• Tap changer type (OCTC / OLTC)
• Quantity
• Delivery location and timeline

• Measurement of winding resistance
• Measurement of voltage ratio and check of polarity and vector group
• Measurement of impedance voltages
• Measurement of load losses
• Measurement of no load losses and no load current
• Measurement of harmonics induced overvoltage withstand test
• Separate source voltage-withstand tests on HV and LV windings
• Bushing routine tests
• Oil Leakage Test
• Relief Device Test
• Dielectric Routine Tests
• Galvanizing Tests
• Magnetic Balance Tests
• Induced over voltage withstand Tests
• Tap changer Tests
• Oil Tests.

• Oil Temperature Indicator (OTI)
• Winding Temperature Indicator (WTI)
• Magnetic Oil-level Gauge (MOG)
• Pressure Relief Device (PRD)
• Marshalling Box
• Forced Fan Cooling
• OLTC & RTCC Panel with AVR
• Bi-directional Rollers
• Radiator Valves
• Dehydrating Breather
• Current Transformer
• Additional Neutral Terminal.