3-Phase Oil Immersed Power Transformers

35kv Oil Immersed Power Transformer
35kv Oil Immersed Power Transformer
35kv Oil Immersed Power Transformer
35kv Oil Immersed Power Transformer
35kv Oil Immersed Power Transformer
35kv Oil Immersed Power Transformer
35kv Oil Immersed Power Transformer
35kv Oil Immersed Power Transformer

35kv Oil Immersed Power Transformer

TAILI  35kV oil immersed power transformer series is specially designed for 35kV and below medium-voltage power systems, where stable voltage regulation, low operating loss, and long-term reliability are essential.

  • ·   35kV / 33kV medium voltage application

  • ·   Three-phase 50Hz / 60Hz power systems

  • ·   Low no-load loss & energy efficiency

  • ·   Low noise performance

  • ·   Strong insulation system

  • ·   Short-circuit withstand capability

  • ·   Sealed oil tank & low maintenance

  • ·   IEC / ANSI / GB standards

  • ·   Utility, substation, industrial usage

  • ·   Custom voltage ratio & OEM supply

Our three-phase oil-immersed transformer series is developed exactly around these purchasing priorities.


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Basic Info.

Primary Voltage30, 33, 34.5, 35, 36, 38.5kV or others
Secondary Voltage6.3, 11, 15kV or others
Vector GroupDyn11, Dyn5, Yyn0 or others
Impedance4%, 6%
Capacity (Power Rating)31.5, 25, 20, 16, 12.5, 10, 8, 6.3, 5, 4, 3.15, 2.5MVA
H.V. Tap Range±2 × 2.5% or others
BIL (Basic Insulation Level)30–150 kV
StandardsIEC, IEEE, ANSI, DOE
CertificatesCE, SGS, CNAS


Why Choose Our 35kV Oil Immersed Power Transformer


·   Low Loss Core Design

Using high-permeability CRGO silicon steel core with step-lap structure, the transformer effectively reduces no-load loss, magnetizing current, and operating cost. Ideal for long-hour grid operation.


·   Low Noise Operation

Precision core clamping system and anti-vibration structure minimize sound levels during operation, especially suitable for city substations, factories, and commercial districts.


·   Excellent Thermal Stability

Mineral insulating oil combined with optimized oil duct circulation ensures efficient heat dissipation and reliable temperature rise control under continuous load.


·   Strong Short-Circuit Resistance

Advanced winding compression structure greatly improves dynamic stability and withstand capability against sudden short-circuit current impact.


·   High Insulation Reliability

High-grade insulation paper, vacuum drying process, and moisture-proof sealing technology ensure stable dielectric performance and longer service life.


·   Maintenance Friendly Sealed Tank

Corrugated tank or radiator tank options available. Fully sealed structure minimizes oil aging, moisture ingress, and maintenance frequency.


Features of 35kv Oil Immersed Power Transformer

1. Made of high-magnetic-permeability cold-rolled silicon steel sheets, effectively reducing no-load loss.

2. The winding conductor can be selected as high-quality copper or aluminum from well-known manufacturers according to customer requirements, providing excellent conductivity.

3. The transfomer is fully sealed with low noise.

4. The corrugated oil tank is equipped with a pressure relief valve to isolate air and slow down oil deterioration, achieving true maintenance-free operation.

5. Corrugated walls provide three functions—cooling, breathing, and expansion—making the transformer self-adaptive.

6. The core undergoes vacuum annealing and epoxy curing, giving it a designed service life of over 40 years.

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Advantages of 35kv Oil Immersed Power Transformer

01 Production Equipments for 35kv Oil Immersed Power Transformer

35kv Oil Immersed Power Transformer

02 Accessories of 35kv Oil Immersed Power Transformer

35kv Oil Immersed Power Transformer

03 Power transformer

35kv Oil Immersed Power Transformer

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Application scenarios

Power Utilities & Grid Distribution Systems

Power Utilities & Grid Distribution Systems

This includes urban and township substations, regional distribution stations, long-distance distribution nodes, and grid expansion or upgrade projects. 35 kV transformers are mainly used for stepping down 35 kV to medium-voltage levels (10–22 kV) for stable regional power supply.
Industrial, Infrastructure & Energy Projects

Industrial, Infrastructure & Energy Projects

Widely applied in industrial parks, manufacturing plants, mining sites, oil and gas fields, data centers, airports, ports, rail transit systems, and renewable energy plants (solar/wind). They provide reliable medium-voltage power for large-scale industrial and infrastructure loads.
Rural Electrification & Public Utilities

Rural Electrification & Public Utilities

Used in rural power networks, agricultural irrigation systems, new rural development, and public facilities such as hospitals, schools, and government buildings. The 35 kV voltage level offers long transmission distance and cost-efficiency, making it ideal for rural and remote-area electrification.

Package and Shipping

35kv Oil Immersed Power Transformer

Service System

Pre-sales support

- Provide customized power distribution scheme design to optimize cabinet size, equipment layout and product configuration;

- For special needs (such as non-standard voltage, explosion-proof certification), provide detailed technical solutions within 12 hours.


Routine tests:

-Measurement of winding resistance

-Measurement of voltage ratio

-Check of vector group

-Mesurement of impendance voltage and load loss

-Measurement of no load oss and current

-Separate-source voltage withstand test

-Induced overvoltage withstand test

-Dimension checking

 

Type Tests

-Lighting impulse test

-Temperature rise test


After-sales guarantee

- Quick response: reply to fault report within 24 hours, remote debugging or on-site service within 48 hours (domestic);

- Regular return visits: inspect the operation status of the equipment free of charge every year and provide maintenance suggestions;

- Transparent service: the cause of the failure is explained in writing, the maintenance cost is priced according to the market standard, and the cost is refunded on the spot for valid complaints;

- Warranty policy: 1-3 years warranty for the whole machine (according to the model), lifetime costprice spare parts supply.


Frequently Asked Questions

What is a 35kV oil immersed power transformer used for?

It is mainly used in medium-voltage transmission and distribution systems to step down or step up voltage between substations and end users.

Why choose oil immersed type instead of dry type?

Oil immersed transformers usually offer higher capacity range, better cooling performance, overload capability, and lower initial cost for outdoor applications.

Can you customize voltage ratio?

Yes. We can customize HV/LV voltage ratio, tap range, vector group, frequency, and accessories.

Do you support OEM branding?

Yes. Nameplate, logo, painting color, packaging, and documents can be customized.


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