20kV, S series oil-immersed transformers

Product Model Meaning

Product Overview

S series type fully sealed oil-immersed transformer is suitable for AC 50Hz, rated working voltage 20kV and below in the power system, as petroleum, metallurgy, chemical industry, textile, light industry and other enterprises and dusty places of the distribution transformer.

Cde Dsign

1.High-efficiency core structure

Adopting high permeability grain oriented cold rolled silicon steel sheet, full oblique seam stacking process, the core column is multi-stage stepped circular cross-section, uniform magnetic circuit, low no-load loss.

2. Strong heat dissipation winding process

The winding adopts corrugated oil channel + tight tape tying, non-impregnated paint process, high heat dissipation efficiency; concentric coil design, high-voltage winding is equipped with power-off adjustable tap changer, safe operation.

3. Fully sealed tank system

Corrugated oil tank structure: both heat dissipation and "breathing" compensation function, vacuum oil injection process to eliminate moisture intrusion, no oil storage cabinet design, maintenance-free, anti-oil aging.

Security And Monitoring

1. Multiple safety protection: 30~2500kVA standard with pressure relief valve, optional gas relay (with alarm/trip function).

2. Intelligent temperature control: The whole system is equipped with oil-immersed glass thermometer as standard, and 1000~2000kVA is equipped with outdoor signal thermometer to monitor the oil temperature in real time.

Advantageous Highlights

1. Long life and low maintenance: Fully sealed anti-oxidation design, no need for regular oil sample testing.

2. Compact and reliable: Corrugated tank surface powder coating, corrosion resistance and solid structure.

3. Safety upgrade: Tap changer power-off operation + multiple protection devices to eliminate operational risks.

Product certificate

Transformer Workshop

20kV oil-immersed transformers are high - quality electrical devices with several notable features.

I. Design and Construction

These transformers are engineered with precision. The oil - immersion design serves multiple purposes. The insulating oil not only provides excellent electrical insulation but also aids in heat dissipation. The core is made of high - quality magnetic materials, which ensures efficient magnetic flux transfer and reduces energy losses during the transformation process.

II. Performance Characteristics

1. Voltage Transformation: They are specifically designed to handle 20kV input voltages and transform them to the desired output voltages accurately. This makes them suitable for a variety of industrial and power distribution applications.
2. High Efficiency: Thanks to their advanced design, they can achieve high - efficiency levels. This means less energy is wasted during the transformation, resulting in cost savings and a more environmentally - friendly operation.
3. Reliability: Built with robust materials and strict manufacturing standards, these transformers are highly reliable. They can operate continuously for long periods without significant breakdowns, ensuring a stable power supply.

III. Safety and Maintenance

Safety is a key aspect. The oil - immersed design helps in preventing electrical arcing and overheating. In terms of maintenance, regular checks of the oil level and quality, along with inspections of the electrical connections, can keep the transformer in optimal condition for years. Overall, 20kV oil-immersed transformers are an excellent choice for reliable and efficient power transformation in various electrical systems.

The 20kV oil-immersed transformer is a critical electrical device designed to efficiently transfer electrical energy at medium voltage levels while ensuring safe and reliable operation. Widely used in industrial plants, commercial buildings, power distribution networks, and renewable energy facilities, oil-immersed transformers play a vital role in the stability and efficiency of power systems.

Oil-immersed transformers are characterized by their use of insulating oil as a coolant and dielectric medium. The oil performs two primary functions: it cools the transformer’s core and windings, dissipating heat generated during operation, and it provides electrical insulation between internal components. This design ensures high thermal performance, extends the lifespan of the transformer, and maintains operational safety even under heavy load conditions.

The 20kV rating indicates the transformer is suitable for medium voltage distribution networks. These transformers can step down voltage from higher distribution levels to levels suitable for industrial or commercial use. They are essential for maintaining voltage stability, protecting electrical equipment, and reducing energy losses in distribution systems.

Constructed with high-quality magnetic core and copper or aluminum windings, oil-immersed transformers provide excellent electrical performance and efficiency. The core is carefully laminated to minimize eddy current and hysteresis losses, improving overall energy efficiency. Windings are insulated using high-grade materials to withstand high voltage stresses and thermal effects during prolonged operation.

Safety and reliability are critical features of 20kV oil-immersed transformers. They are equipped with pressure relief devices, conservator tanks, temperature gauges, and protective relays to monitor and respond to abnormal operating conditions. Advanced designs also include Buchholz relays, oil level indicators, and cooling fans to ensure proper operation and prevent potential failures. Routine maintenance, such as oil testing and inspection, helps maintain performance and prevent unexpected downtime.

Oil-immersed transformers are designed to operate efficiently under a wide range of environmental conditions. Their robust tanks, conservator systems, and sealing mechanisms protect the internal components from moisture, dust, and contaminants. The use of high-quality insulating oil ensures excellent dielectric strength, thermal conductivity, and oxidation stability, contributing to long service life and consistent performance.

Energy efficiency is a key consideration in modern transformer design. Low-loss cores, optimized winding configurations, and advanced cooling methods help minimize energy losses and reduce operational costs. Many 20kV oil-immersed transformers are also designed to comply with international standards such as IEC, IEEE, and ANSI, ensuring high quality, reliability, and compatibility with global power networks.

Installation and operation are straightforward, and the transformers are available in various configurations to meet specific application requirements, including single-phase or three-phase designs, on-load tap changers, and customized rating options. These transformers are critical for substations, industrial complexes, commercial buildings, and renewable energy integration, ensuring safe and efficient power distribution.

In summary, the 20kV oil-immersed transformer is a high-performance, reliable, and efficient solution for medium-voltage power distribution. Its robust construction, superior electrical characteristics, and advanced safety features make it a preferred choice for utility companies, industrial operators, and commercial facilities, providing stable voltage supply, minimizing energy losses, and enhancing the overall reliability of the electrical network.