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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—effectively addressing operational challenges, 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.
