Industrial Distribution Transformer – 20KV Oil-Immersed
This 20KV Oil-Immersed Distribution Transformer has been designed for heavy commercial industrial power distribution, providing an excellent solution for efficient and reliable 50Hz AC power distribution. The 20KV oil-immersed transformer is built using high quality magnetic grain oriented silicon steel core, coupled with precision wound coil systems, the result being the transformer delivers low losses and high reliability under constant operational conditions. The transformer is housed within a corrugated tank with anti-dust spray coating to dissipate heat and improve insulation integrity through the use of vacuum oil injection technology.
This transformer is used in industrial sectors such as oil and gas, metallurgy and chemical process applications; the transformer meets GB/T, JB/T and IEC 60076 minimum specifications for industrial transformers. The presence of a pressure relief valve (30-2000 kVA) and oil temperature monitoring provides for a long service life of the transformer in extremely demanding industrial environments.
- 20KV primary rating; suitable for use with 50Hz AC power.
- Available in sizes 30kVA – 2500kVA rated with either S11 or S12 low-loss type series.
- Design of corrugated tank maximises external cooling area and minimise oil volume.
- Integrated oil pressure relief and oil temperature monitoring systems improve operational safety.
20KV Oil Immersed Industrial Distribution Transformer Benefits & Advantages
Improved Dependability and Operating Life
Premium grade grain oriented silicon steel and precise winding techniques provide the transformer with long term and durable operation.
High Level Safety
Installation of a pressure relief valve and oil temperature monitoring protect against over pressure or overheating under extreme operating condition.
Optimised Efficiency
The use of a low-loss core and an efficiently designed corrugated cooling system will result in total energy savings and reduced operating costs.
High Quality Insulation
Vacuum filling of transformer oil prevents air pockets in the insulation system, therefore providing a high degree of dielectric strength and good stability under fluctuating loads.
Wide Range of Applications
Designed to withstand the electrical and mechanical forces typical of heavy industrial environments.
Conformance with Standards
Made according to GB/T, JB/T, and IEC 60076, makes this transformer acceptable for both utility and industrial applications worldwide.
Industries and Applications
Petroleum Refining
Application of transformer for supply of reliable power to pumps, compressors and other processing units within the oil/gas producing industry.
Metals Smelting
Transformer is built to operate under high harmonic loads and voltage swings that are common to the metals processing industry.
Chemical Processing
Sealed transformer construction and high quality insulating materials make this type of transformer ideal for corrosive and highly dynamic chemical process applications.
Large-Scale Construction Projects
Distribution transformers are ideal for application in large scale commercial real estate development, industrial property development and public utilities.
Technical Data & Specifications
20kV S11 and S12 series oil-immersed non-excitation voltage regulating transformers. Custom tapping ranges and secondary voltages available upon request.
S11 Series Parameters
| Rated Capacity (kVA) | High Voltage (kV) | Tap Range | Low Voltage (kV) | Connection | No-load Loss (kW) | Load Loss (kW) | No-load Current (%) | Impedance (%) |
|---|---|---|---|---|---|---|---|---|
| 30 | 20 | ±5% ±2×2.5 |
0.4 | Dyn11 Yzn11 Yyn0 | 0.10 | 0.69/0.66 | 2.1 | 5.5 |
| 50 | Dyn11 Yzn11 Yyn0 | 0.13 | 1.01/0.96 | 2.0 | 5.5 | |||
| 63 | Dyn11 Yzn11 Yyn0 | 0.15 | 1.20/1.15 | 1.9 | 5.5 | |||
| 80 | Dyn11 Yzn11 Yyn0 | 0.18 | 1.44/1.37 | 1.8 | 5.5 | |||
| 100 | Dyn11 Yzn11 Yyn0 | 0.20 | 1.73/1.65 | 1.6 | 5.5 | |||
| 125 | Dyn11 Yzn11 Yyn0 | 0.24 | 2.08/1.98 | 1.5 | 5.5 | |||
| 160 | Dyn11 Yzn11 Yyn0 | 0.29 | 2.54/2.42 | 1.4 | 5.5 | |||
| 200 | Dyn11 Yzn11 Yyn0 | 0.34 | 3.00/2.86 | 1.3 | 5.5 | |||
| 250 | Dyn11 Yzn11 Yyn0 | 0.40 | 3.52/3.35 | 1.2 | 5.5 | |||
| 315 | Dyn11 Yzn11 Yyn0 | 0.48 | 4.21/4.01 | 1.1 | 5.5 | |||
| 400 | Dyn11 Yzn11 Yyn0 | 0.57 | 4.97/4.73 | 1.0 | 5.5 | |||
| 500 | Dyn11 Yzn11 Yyn0 | 0.68 | 5.94/5.66 | 1.0 | 5.5 | |||
| 630 | Dyn11 Yyn0 | 0.81 | 6.82 | 0.9 | 6.0 | |||
| 800 | Dyn11 Yyn0 | 0.98 | 8.25 | 0.8 | 6.0 | |||
| 1000 | Dyn11 Yyn0 | 1.15 | 11.33 | 0.7 | 6.0 | |||
| 1250 | Dyn11 Yyn0 | 1.38 | 13.20 | 0.7 | 6.0 | |||
| 1600 | Dyn11 Yyn0 | 1.66 | 15.95 | 0.6 | 6.0 | |||
| 2000 | Dyn11 Yyn0 | 1.95 | 19.14 | 0.6 | 6.0 | |||
| 2500 | Dyn11 Yyn0 | 2.34 | 22.22 | 0.5 | 6.0 |
S12 Series Parameters (Lower Loss)
| Rated Capacity (kVA) | High Voltage (kV) | Tap Range | Low Voltage (kV) | Connection | No-load Loss (kW) | Load Loss (kW) | No-load Current (%) | Impedance (%) |
|---|---|---|---|---|---|---|---|---|
| 30 | 20 | ±5% ±2×2.5 |
0.4 | Dyn11 Yzn11 Yyn0 | 0.09 | 0.69/0.66 | 2.1 | 5.5 |
| 50 | Dyn11 Yzn11 Yyn0 | 0.12 | 1.01/0.96 | 2.0 | 5.5 | |||
| 63 | Dyn11 Yzn11 Yyn0 | 0.14 | 1.20/1.15 | 1.9 | 5.5 | |||
| 80 | Dyn11 Yzn11 Yyn0 | 0.16 | 1.44/1.37 | 1.8 | 5.5 | |||
| 100 | Dyn11 Yzn11 Yyn0 | 0.18 | 1.73/1.65 | 1.6 | 5.5 | |||
| 125 | Dyn11 Yzn11 Yyn0 | 0.22 | 2.08/1.98 | 1.5 | 5.5 | |||
| 160 | Dyn11 Yzn11 Yyn0 | 0.26 | 2.54/2.42 | 1.4 | 5.5 | |||
| 200 | Dyn11 Yzn11 Yyn0 | 0.31 | 3.00/2.86 | 1.3 | 5.5 | |||
| 250 | Dyn11 Yzn11 Yyn0 | 0.36 | 3.52/3.35 | 1.2 | 5.5 | |||
| 315 | Dyn11 Yzn11 Yyn0 | 0.43 | 4.21/4.01 | 1.1 | 5.5 | |||
| 400 | Dyn11 Yzn11 Yyn0 | 0.51 | 4.97/4.73 | 1.0 | 5.5 | |||
| 500 | Dyn11 Yzn11 Yyn0 | 0.61 | 5.94/5.66 | 1.0 | 5.5 | |||
| 630 | Dyn11 Yyn0 | 0.73 | 6.82 | 0.9 | 6.0 | |||
| 800 | Dyn11 Yyn0 | 0.88 | 8.25 | 0.8 | 6.0 | |||
| 1000 | Dyn11 Yyn0 | 1.03 | 11.33 | 0.7 | 6.0 | |||
| 1250 | Dyn11 Yyn0 | 1.24 | 13.20 | 0.7 | 6.0 | |||
| 1600 | Dyn11 Yyn0 | 1.49 | 15.95 | 0.6 | 6.0 | |||
| 2000 | Dyn11 Yyn0 | 1.75 | 19.14 | 0.6 | 6.0 | |||
| 2500 | Dyn11 Yyn0 | 2.10 | 22.22 | 0.5 | 6.0 |
Note: Load loss values above diagonal line apply to Dyn11/Yzn11, below to Yyn0. Parameters also valid for 20(10)kV dual-voltage transformers. Contact us for detailed dimension drawings.
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Reasons to Purchase Our 20KV Oil-Immersed Industrial Distribution Transformer
Industrial-Grade Manufacturing
Each transformer is constructed using high-grade silicon steel and precise winding, all of which are tested according to GB/T and IEC standards to meet the requirements of industrial utilities and process uses.
Certified Quality
Every transformer is subjected to complete routine testing, including winding resistance tests, dielectric strength tests, and temperature rise tests, ensuring that they will perform reliably in the field.
Competitive Pricing
Our factory direct supply of oil-type transformers provides an overall savings to industrial users purchasing multiples in quantity for industrial and major infrastructure projects.
Fast Lead Times
Most standard S11/S12 models ship within 4 – 6 weeks. Custom variations have more flexible scheduled production lead times.
Certifications & Standards
GB/T 1094
ISO 9001
CE
JB/T 3837
How This 20KV Industrial Distribution Transformer Can Be Incorporated Into Your Project
Professional recommendations for EPC firms, industrial facility managers, and utility planners for selecting oil-immersed distribution transformers
Project Applications
For Petrochemical Plants, the mechanical integrity provided by robust insulation and proper pressure relief features allows for safe operations in proximity to volatile materials. For Metallurgical Facilities, the transformer has the ability to withstand the high harmonic currents generated by both arc furnaces and rolling mills. Large Infrastructure Projects will benefit from the compact corrugated tank configuration and low maintenance needs of the equipment.
S11 vs. S12 — The Efficiency Choice
Both the S11 series and S12 series provide excellent cost efficiencies for standard industrial usage; however, the S12 series has lower no-load losses resulting in lower energy wastage during periods of low load (this choice is typically the best choice for a facility with variable usage patterns). Both series guarantee the same robustness and safeguards.
Installation and Safety
Install the transformer on a level pad with sufficient oil containment and aeration provisions. The factory-supplied equipment includes pressure relief valve(s) and oil temperature monitoring devices to ensure adequate physical protection. Routine inspection will focus on the level of oil and the condition of the transformer bushings and connections, helping to ensure decades of long-term reliable utilization.
Frequently Asked Questions
How much does a 20 mVA transformer cost?
The cost of a 20 MVA transformer varies based on voltage, impedance, and accessories. As a manufacturer, we provide competitive factory-direct pricing — contact us with your specifications for a detailed quotation.
What is the difference between transformer and distribution transformer?
A general transformer converts voltage levels. A distribution transformer specifically steps down medium voltage (like 20KV) to utilization voltage (0.4KV) for end-user supply. It is optimized for efficiency at varying lower loads, unlike a power transformer used in transmission.
What is the capacity of a 20 MVA transformer?
A 20 MVA (20,000 kVA) transformer can deliver 20 megavolt-amperes of apparent power. Under standard conditions, it can supply a continuous load of around 16-18 MW, depending on the power factor. Our range extends up to 2500kVA for 20KV distribution.
What is the 80% rule for transformers?
The 80% rule recommends loading a transformer no more than 80% of its nameplate capacity for continuous loads, preventing excessive heating and extending insulation life. It is a widely followed best practice in industrial power system design.
