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China factory - Hunan Hentg Power Electric Technology Co., Ltd.

Hunan Hentg Power Electric Technology Co., Ltd.

  • China,Changsha ,Hunan
  • Verified Supplier
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  3. 3150 kVA 20kV/0.4kV Oil-Immersed Transformer with Oil Conservator – 3.15 MVA
China 3150 kVA 20kV/0.4kV Oil-Immersed Transformer with Oil Conservator – 3.15 MVA
China 3150 kVA 20kV/0.4kV Oil-Immersed Transformer with Oil Conservator – 3.15 MVA

  1. China 3150 kVA 20kV/0.4kV Oil-Immersed Transformer with Oil Conservator – 3.15 MVA

3150 kVA 20kV/0.4kV Oil-Immersed Transformer with Oil Conservator – 3.15 MVA

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Payment Terms L/C,T/T
Supply Ability 300-500MVA
Delivery Time 20-30 DAYS
Packaging Details Waterproof plastic film
Rated Capacity 3150KVA Oil-immersed MV HV transformer
Voltege Ratio HV/LV: 20kV/0.4kV
Tap Range ±2×2.5%
Short-circuit impedance 6%
Connection group label Dyn11
Rated frequency 50Hz
Winding Material All Aluminum
Oil Box Salt Spray Protection Rating C3/C4/C5
Transformer oil conservator Yes
Warranty 1 year
Brand Name HENTG POWER
Model Number S11-3150
Certification CE, ISO9001, IEC
Place of Origin CHINA

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  1. Product Details
  2. Company Details

Product Specification

Payment Terms L/C,T/T Supply Ability 300-500MVA
Delivery Time 20-30 DAYS Packaging Details Waterproof plastic film
Rated Capacity 3150KVA Oil-immersed MV HV transformer Voltege Ratio HV/LV: 20kV/0.4kV
Tap Range ±2×2.5% Short-circuit impedance 6%
Connection group label Dyn11 Rated frequency 50Hz
Winding Material All Aluminum Oil Box Salt Spray Protection Rating C3/C4/C5
Transformer oil conservator Yes Warranty 1 year
Brand Name HENTG POWER Model Number S11-3150
Certification CE, ISO9001, IEC Place of Origin CHINA
High Light 3150 kVA Oil-Immersed Transformer ，20kV/0.4kV Distribution Transformer ，Oil Conservator Power Transformer
Product Overview
The HENTG POWER 3150 kVA 20kV/0.4kV Three-Phase Oil-Immersed Transformer is engineered for medium voltage power distribution in demanding industrial environments including manufacturing plants, mining operations, substations, and utility networks.
This 3.15 MVA oil-filled transformer with integrated oil conservator tank ensures reliable performance in high-temperature and heavy-load conditions. Manufactured to IEC standards, it delivers low loss performance, robust overload capacity, and extended service life for outdoor installation in hot, dusty regions.
HENTG POWER-Your power engineer
Key Features & Specifications
  • Rated Power: 3150 kVA / 3.15 MVA
  • Voltage Ratio: 20kV / 0.4kV (customizable)
  • Three-Phase Oil-Immersed Construction
  • Integrated Oil Conservator Tank
  • ONAN Cooling System
  • Optimized for High Ambient Temperature Operation
  • Low No-Load & Load Loss Design
  • Enhanced Short-Circuit Withstand Capability
  • Outdoor Heavy-Duty Structure
  • 25+ Year Design Life
  • IEC Standard Manufacturing
Technical Specifications
Parameter Specification
Rated Capacity 3150 kVA
High Voltage 20 kV
Low Voltage 0.4 kV (400 V)
Frequency 50 Hz / 60 Hz
Vector Group Dyn11 (customizable)
Cooling Method ONAN (Oil Natural Air Natural)
Installation Type Outdoor / Ground Mounted
Insulation Class Class A
Winding Material High conductivity copper or aluminum
Core Material High-grade silicon steel for reduced core loss
Tap Changer Off-load tap changer ±2×2.5% or ±5%
Standard Accessories
  • Buchholz relay
  • Pressure relief valve
  • Oil temperature indicator
  • Winding temperature indicator (optional)
  • Magnetic oil level gauge
  • Drain and sampling valve
  • Lifting lugs and pulling eyes
Applications
  • Mining operations
  • Cement factories
  • Manufacturing plants
  • Government infrastructure projects
  • Utility substations
  • Rural electrification programs
  • Oil & gas facilities
Solutions for West Africa & Hot Regions
High Ambient Temperature (40-50°C)
Many West African countries experience extreme heat which accelerates insulation aging and reduces transformer life.
Our Solution: Optimized cooling design, increased oil volume, and controlled temperature rise ensure stable operation under high ambient conditions.
Grid Voltage Fluctuation & Overload
Unstable grid and sudden load changes are common in developing regions.
Our Solution: Strong short-circuit withstand design and stable voltage regulation. Tap changer allows adaptation to grid voltage variation.
Dust & Harsh Outdoor Conditions
Dust accumulation affects heat dissipation and long-term reliability.
Our Solution: Sealed tank structure, reinforced gasket system, and durable external coating protect the transformer from dust ingress and corrosion.
Limited Maintenance Resources
Remote industrial and mining sites have limited technical maintenance teams.
Our Solution: Low-loss core reduces heat stress. High-quality materials and strict factory testing reduce failure rate and maintenance frequency.
Frequently Asked Questions
Can this transformer operate at 45-50°C ambient temperature?
Yes. It is specifically designed for high-temperature environments common in West Africa.
Is it suitable for mining or heavy industrial use?
Yes. The 3150 kVA transformer is ideal for mining operations, cement plants, and large manufacturing facilities.
Can voltage be customized to 33kV or other levels?
Yes. Voltage ratio can be customized based on your local grid requirements and specifications.
Does it comply with international standards?
Yes. We manufacture according to IEC standards and provide complete factory test reports.
What is the typical delivery time?
Typically 30-45 days depending on specifications and order quantity.
Do you provide technical support for projects?
Yes. We provide comprehensive technical documentation, engineering drawings, and remote technical support.
About HENTG POWER
HENTG POWER is a professional transformer manufacturer specializing in oil-immersed transformers, dry-type transformers, and medium voltage distribution equipment. With extensive experience exporting to Africa, Southeast Asia, and the Middle East, we support industrial and utility projects worldwide.
Our Technical Strengths
  • Advanced transformer design engineering
  • Strict quality control system
  • Complete routine and type testing
  • IEC standard compliance
  • Custom-made voltage solutions
  • Reliable export packaging and logistics
We focus on long-term reliability, stable performance, and lifecycle cost optimization — delivering value beyond initial price. HENTG POWER - Reliable Power Solutions for Global Projects.

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Manufacturer

  • Year Established:

    2011

  • Total Annual:

    300-500MVA

  • Employee Number:

    150~200

  • Ecer Certification：

    Verified Supplier

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Get in touch with us

  • Reach Us
  • Hunan Hentg Power Electric Technology Co., Ltd.
  • Room905, D6 building, CCSP Industrial Park, Yuelu District, Changsha，Hunan province, China
  • https://www.hentgpower.com/

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