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115KV/34.5KV 31.5MVA 3 Phase Power Transformer

The 31.5 MVA 115/34.5 kV 3-Phase Power Transformer is engineered for continuous operation in demanding substation environments. Designed to meet IEC 60076 standards, it offers reliable performance with a robust ONAN/ONAF cooling system. The transformer features a 32-step on-load tap changer for precise voltage regulation and is equipped with comprehensive safety and monitoring accessories, including Buchholz relays and thermal imaging. Its compact design and outdoor suitability make it ideal for installations where space is limited.
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Product Accessories

On-Load Tap Changer (OLTC): 32-step or equivalent

Automatic Voltage Regulator (AVR): Ensures stable output voltage

Buchholz Relay: Two-contact gas and oil flow protection

Thermal Imaging Relay: Monitors temperature variations

Pressure Relief Valve: Dual-contact for overpressure protection

Oil Conservator System: Includes membrane and rupture relay

Magnetic Oil Level Indicators: For main tank and OLTC

Silica Gel Dehydrating Breathers: For moisture control

Fans and Removable Radiators: For enhanced cooling

Grounding Terminals & Lifting Lugs: For safe handling and installation

Product Specifications

Rated Power
31.5 MVA (Continuous)
36 MVA (Short-Term)
Primary Voltage
115 kV
Secondary Voltage
34.5 kV
Tapping Range
±16 × 0.625%
Cooling Method
ONAN / ONAF
Impedance Voltage
8.0% at 35 MVA
No-Load Losses
25.28 kW
Load Losses
118.8 kW
Temperature Rise
55°C (Oil), 65°C (Winding)
Insulation Level
BIL 550/170/95 kV​

Product Applications

Economy is more affordable

Product Advantages

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Enhanced Voltage Regulation

The 32-step on-load tap changer ensures precise voltage control, accommodating fluctuations in load demand and maintaining system stability.

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Robust Cooling System

The ONAN/ONAF cooling method effectively manages heat dissipation, allowing the transformer to handle varying load conditions without compromising performance.

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Comprehensive Safety Features

Equipped with Buchholz relays, thermal imaging, and pressure relief devices, the transformer offers multiple layers of protection against potential faults and operational anomalies.

WellDone Power Transformer Plan Drawing


FAQ

  • What range of transformer products do you offer and which standards do they meet?
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    We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
  • How do you ensure the quality and reliability of your transformers?
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    Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
  • What are your production lead times, customization options, and global market reach?
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    For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.
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 Add: No.88 Fengwang Industry Zone, Liuji Town,
Tongshan District, Xuzhou, China
 Tel: +86-516-85021869
 Email:  info@welldonepower.com
 WhatsApp: +8618952212851
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