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31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core

Quality 31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core factory
Quality 31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core factory
Quality 31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core factory
Quality 31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core factory

31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core

Product Summary

31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core 31500 kVA 220 kV Oil-Immersed Main Power Transformer Reliable Backbone for High-Voltage Transmission Systems The 31500 kVA 220 kV oil-immersed main power transformer is engineered as a core asset for ...

Key Attributes
Payment Terms: ,T/T
Product Custom Attributes
Highlight

31.5 MVA oil-immersed transformer

,

220 KV power transformer with OLTC

,

IEC certified grid substation transformer

Frequency:
50/60Hz
Type:
Power Transformer, Oil-immersed
Rated Voltage:
10kV-35kV
Material:
Copper
Capacity:
Customized
Primary Voltage:
0~250V
Winding Material:
Copper 100%
Product Description
31.5 MVA 220 KV Oil-Immersed Transformer with OLTC IEC Certified for Grid Substations Cooper Core
31500 kVA 220 kV Oil-Immersed Main Power Transformer
Reliable Backbone for High-Voltage Transmission Systems
The 31500 kVA 220 kV oil-immersed main power transformer is engineered as a core asset for high-voltage transmission and substation applications. Designed in full compliance with IEC 60076 and relevant international standards, it delivers long-term operational reliability, excellent voltage regulation capability, and optimized life-cycle cost performance.
This transformer is widely deployed in 220 kV transmission substations, power plant grid-connection systems, and large industrial self-owned substations, especially in regions undergoing power grid expansion and upgrading.
Technical Specifications
Transformer Type Oil Immersed
Rated Power (KVA) 31500
High Voltage (KV) 220 / 230
Low Voltage (KV) 6.3 / 6.6 / 10.5 / 11 / 21.36 / 35.37 / 69
Short Circuit Impedance 12~14%
No-load Loss (W) 17
On-load Loss (W) 115
Insulation Class A (105℃), E (120℃), B (130℃)
Vector Group Dyn11, YNd1d1, etc.
Cooling ONAN, KNAN, ONAF, KNAF
Ambient Temperature -45℃ ~ +50℃
Standards IEC, AS, EN, IEEE, ANSI, GOST
Regional Hub Substation Applications
Stability at the Hub Level, Bearing Every kWh of Electricity
Core Application: Serving as the backbone of power distribution networks, these substations bridge the main grid and distribution systems.
Critical Challenges in Hub Substations
  • Load fluctuations (peak demand or line failures) exceeding standard short-circuit resistance, causing winding deformation and power outages
  • Chronic operational losses—excessive no-load and load losses—violating energy efficiency standards and contradicting carbon neutrality goals
  • Traditional transformer tanks prone to deformation and insulation degradation, with 15-year lifespan requiring frequent costly maintenance
In urban and industrial power distribution systems, regional hub substations play a pivotal role as bridges: handling input voltages of 220kV or higher while consistently stepping down to medium-voltage distribution networks, ensuring uninterrupted operation for dozens of distribution terminals.
Certifications
HENTG POWER 110kV-220kV main transformer, engineered for critical substation operations. Its core strengths—exceptional reliability, extended lifespan, and minimal energy loss—effectively resolve operational pain points, establishing it as the true stability anchor of urban power grids.

Company Information
About HENTG POWER
HENTG POWER is a professional power system solutions designer, manufacturer, and installer, established in 2011. Occupying 100,000 square meters, we are committed to providing reliable, high-performance solutions for global power systems.
Expertise in 110kV-220kV Transformers
We specialize in manufacturing main transformers (power transformers) ranging from 110kV to 220kV, with a maximum capacity of 500kV/480MVA, covering both oil-immersed and dry-type types. All products strictly adhere to international standards such as ANSI, IEEE, DOE 2016, CSA, and IEC 60076. We also provide supporting equipment such as GIS, switchgear, and substations, offering complete substation solutions.
Quality Assurance System
We adhere to the principle of "providing samples for confirmation before production and completing final inspection before shipment," and provide quality control and testing reports throughout the process. We also support Factory Acceptance Testing (FAT). All transformer products enjoy a warranty of over 2 years, ensuring long-term stable operation.
Why Choose HENTG POWER?
  • Independent professional design and technical team with 7-day drawing confirmation
  • Over 30 senior engineers providing 24/7 online technical support with 30-minute response time
  • One-stop customized solutions from design and manufacturing to installation
  • OEM cooperation with flexible and negotiable payment methods
Service Scope
We accept customized needs (OEM) and provide full-process services from technical consultation, solution design, manufacturing to installation and commissioning, helping customers efficiently build reliable power infrastructure.
For further information on 110kV-220kV main transformer solutions or to obtain detailed technical information, please contact us!

Key Selling Points

⚡ 1. Designed for 220kV Grid Substations

Engineered for high-voltage transmission networks and utility-scale substations with stable long-term operation.

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electrical power transformer

power distribution transformer

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