1000 kVA (11–35 kV) Three Phase Oil Immersed Transformer for Electrical Substation & Utility Distribution

The 1000 kVA (11–35 kV) three phase oil immersed transformer is engineered for robust medium-voltage distribution in electrical substations and utility networks where higher load capacity, stable voltage regulation, and long-term reliability are crucial. Unlike lower-kVA distribution models typically focused on feeder level distribution, the 1000 kVA version bridges the gap between standard feeder transformers and larger industrial substation infrastructure, offering dependable performance for demanding utility, industrial, and infrastructure applications.

While PowerNex’s distribution transformer portfolio supports a broad range from 5 kVA to 5000 kVA, the 1000 kVA class stands out for larger substation and high-demand distribution projects, especially where balanced capacity and cost efficiency are required.

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Technical Specifications

Parameter	Specification
Rated Capacity	1000 kVA
Capacity Range Supported	100 kVA – 5000 kVA (custom available)
Transformer Type	Three Phase Oil Immersed Medium Voltage Transformer
Primary Voltage Range	11 kV, 12.47 kV, 13.8 kV, 22 kV, 24.9 kV, 33 kV, 35 kV
Secondary Voltage Options	208Y/120 V, 400 V, 415 V, 480 V, 600 V, 690 V, or customized outputs
Connection / Vector Group	Dyn11, Yyn0, Yd11, Dd0 or custom
Frequency	50 Hz / 60 Hz
Cooling Method	ONAN (standard), optional ONAF
Insulation Medium	Mineral oil or ester fluid (optional)
Tap Changer	Off-circuit tap changer ±2×2.5% or ±5%, OLTC optional
Standards & Compliance	ANSI, IEEE, IEC
Certifications Available	UL, CSA, cUL, CE based on market
Installation Type	Outdoor electrical substations / distribution hubs

Compared with lower capacity units, the 1000 kVA transformer supports larger load centers and is suitable for urban grids, industrial parks, data centers, and major feeder ties without stepping into full substation transformer territory. This makes it ideal for utility companies and EPC contractors planning mid-to-large distribution expansions or upgrades.

Optimized Design for High-Demand Distribution

Oil Immersed Insulation & Cooling

The oil-immersed design ensures superior thermal management and dielectric strength, enabling the transformer to handle continuous duty and heavy load environments without premature aging or core stress.

• Proven ONAN cooling provides efficient heat dissipation.

• Optional ONAF cooling supports higher load profiles or hotter climates.

This is especially valuable for extended service life with minimal maintenance cycles.

High-Performance Core & Winding

The transformer incorporates high-permeability CRGO (Cold Rolled Grain Oriented) silicon steel cores and precision wound conductors to deliver:

• Reduced no-load and load losses

• Enhanced voltage regulation

• Increased short-circuit strength

Copper or aluminum windings can be selected to optimize cost and performance in line with project requirements.

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Engineered for Diverse Global Grid Standards

PowerNex distribution transformers are designed for compliance with major international standards, including ANSI, IEEE, and IEC, ensuring broad compatibility with grid systems worldwide. Optional international certifications (UL, cUL, CSA, CE) are available to support engineering approval and compliance in North America, Europe, Australia, Southeast Asia, the Middle East, and Latin America.

This multi-standard compliance is critical for projects that require:

• Mixed grid specifications

• Utility modernization and retrofit

• Cross-border infrastructure deployments

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Application Scenarios

While smaller distribution transformers (such as 225 kVA, 300 kVA, 500 kVA, 750 kVA) focus on localized feeder distribution, the 1000 kVA variant is often selected for higher-level distribution and critical load distribution functions:

Utility Distribution Nodes

Used for substation feeder reinforcement, larger feeder ties, or high-growth areas where increased capacity and voltage stability are required.

Industrial Power Distribution

Suitable for industrial parks, manufacturing plants, and process industries requiring reliable medium-voltage distribution with robust load tolerance.

Commercial & Infrastructure Projects

Supports power supply for campus environments, large commercial facilities, data centers, hospitals, and transportation hubs.

Renewable Energy Distribution

Ideal for grid tie-in points of solar and wind power collection systems where medium-voltage step-down is essential before distribution.

Factory Testing & Quality Assurance

As part of PowerNex’s strict quality control, every 1000 kVA distribution transformer undergoes comprehensive testing, including:

• Winding resistance and turns ratio tests

• No-load & load loss verification

• Insulation resistance tests

• Applied & induced voltage stress tests

• Temperature rise and impulse withstand (optional as per standards)

These tests adhere to international norms (IEC 60076, ANSI / IEEE C57) to confirm reliability and safe operation prior to shipment.

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Customization & OEM Supply

Recognizing that every project has unique requirements, PowerNex offers factory-direct customization for:

• Custom primary and secondary voltage ratios

• Special vector group and impedance settings

• Tap changer and cooling upgrades

• Enclosure and environmental protection (coastal, desert, tropic climates)

• Full electrical and layout drawings for engineering approval

OEM and private-label manufacturing options are also available for bulk or distributor partnerships.

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Global Supply, Logistics & Support

PowerNex distribution transformers, including the 1000 kVA class, are supplied with export-grade packaging and global logistics support to regions including:

• North America & Canada

• Europe & UK

• Latin America (Brazil, Argentina, Mexico)

• Australia & Southeast Asia

• Middle East & Africa

Pre-shipment inspection, export documentation, and coordinated delivery ensure smooth customs clearance and arrival to project sites worldwide.

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Why Choose This 1000 kVA Distribution Solution?

• Optimized capacity scaling between feeder and substation levels

• Engineered for continuous heavy load operation

• Flexible voltage and cooling customization

• Designed for global grid standards

• Factory testing, OEM support, and export logistics

• Ideal for utility, industrial, and infrastructure power distribution

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FAQ – 1000 kVA Three Phase Oil Immersed Utility Transformer

What applications is the 1000 kVA oil immersed utility transformer suitable for?

The 1000 kVA three phase oil immersed transformer is widely used in medium voltage utility distribution systems, including public utility substations, feeder stations, industrial distribution networks, infrastructure projects, renewable energy integration, and municipal power supply systems operating within the 11–35 kV range.

What voltage ratings are available for this 1000 kVA transformer?

Standard primary voltages include 11 kV, 13.2 kV, 13.8 kV, 22 kV, 24.9 kV, 33 kV, and up to 35 kV. Secondary voltages commonly include 400 V, 415 V, 480 V, 600 V, and 690 V. Custom voltage combinations are available to meet local utility grid requirements.

Do you support other transformer capacities besides 1000 kVA?

Yes. We support a wide range of transformer capacities for utility and distribution applications, including 200 kVA, 225 kVA, 300 kVA, 500 kVA, 750 kVA, 1000 kVA, 1250 kVA, 1600 kVA, 2000 kVA, 2500 kVA, 4000 kVA, and higher customized ratings based on project specifications.

Is customization available for utility projects and EPC tenders?

Absolutely. Customization options include vector group configuration, tap changer type (off-circuit or on-load), cooling method (ONAN or optional ONAF), impedance level, enclosure design, protection accessories, and complete technical drawings for bidding, approval, and installation.

Which standards and certifications does the transformer comply with?

Our 1000 kVA oil immersed utility transformers are designed and manufactured in accordance with IEC, IEEE, and ANSI standards, with optional UL, cUL, CSA, and CE certifications depending on the destination country and project requirements.

Can the transformer be used for both 50 Hz and 60 Hz power systems?

Yes. The transformer is compatible with both 50 Hz and 60 Hz frequency systems, making it suitable for global utility networks across North America, Europe, the Middle East, Southeast Asia, Africa, and Latin America.

Do you provide factory-direct pricing and international delivery?

Yes. We offer factory-direct wholesale pricing, OEM manufacturing, and global logistics support, supplying utility transformers to buyers in the United States, Canada, Australia, Brazil, Argentina, Mexico, Guyana, Malaysia, Indonesia, Saudi Arabia, the UAE, the UK, Germany, France, Spain, Italy, South Africa, and other international markets.

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Why Buy From Us – Factory Direct Utility Transformer Supplier

Choosing the right utility transformer supplier directly impacts grid reliability, lifecycle cost, and project timelines. With PowerNex, you benefit from:

• Factory-direct manufacturing with competitive wholesale pricing

• Full capacity coverage from 200 kVA to 4000 kVA and beyond

• Custom voltage solutions up to 35 kV for medium voltage distribution systems

• IEC / IEEE / ANSI compliant designs with optional global certifications

• Strict quality control, type testing, and routine testing before shipment

• Complete technical documentation and drawings for utility approval and EPC tenders

• Worldwide delivery experience across utility, industrial, and infrastructure markets

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Get a Quote for Your Utility Transformer Project

If you are sourcing a 1000 kVA three phase oil immersed utility transformer or require custom transformer capacities and voltage configurations for your medium voltage distribution network, our engineering team is ready to support your project.

Contact us today to receive technical consultation, drawings, factory pricing, and lead time details for your utility substation or distribution project — PowerNex.