Three-phase Transformer

Three-phase transformer

Three-phase transformers are static electromagnetic energy conversion devices and are core components of modern power systems. Designed to efficiently and reliably convert the voltage and current levels of three-phase alternating current (AC), they are widely used throughout the entire power generation and transmission process, from distribution to consumption. Our company utilizes advanced design concepts, high-quality materials, and rigorous manufacturing processes to ensure superior performance and long life in a variety of harsh environments.

Our company manufactures three-phase transformers, categorized by cooling method, in dry-type and oil-immersed series. We also manufacture power transformers, rectifier transformers, furnace transformers, and test transformers, all of which meet standard performance standards and offer reliable operation. They feature low loss, low noise, long life, high insulation, and oil leakage resistance.

We use standard software to generate engineering documents based on user needs. We employ high-frequency welding and hydraulic winding pressing processes to enhance short-circuit resistance. We also utilize hydraulic core pressing to increase core strength and reduce noise levels. We also implement comprehensive worker training to ensure product quality and enhance service quality.

1.High efficiency and energy saving

High-quality, low-loss silicon steel sheets or amorphous alloy cores significantly reduce no-load losses (iron losses).

Optimized electromagnetic design and winding structure reduce load losses (copper losses).

Fully compliant with or exceeding energy efficiency levels specified in GB/T, IEC, and IEEE standards (such as GB 20052 Energy Efficiency Levels 1 or 2), this helps users reduce operating costs and supports green and sustainable development.

2.Reliability and long-term effectiveness

Rugged Construction: The robust mechanical design withstands short-circuit current shocks during transportation, installation, and operation.

High-Quality Insulation System: Utilizing insulation materials with thermal resistance ratings of Class A, B, F, H, and above, and treated with vacuum pressure impregnation (VPI), the system offers excellent electrical strength, moisture resistance, and contamination resistance.

Overheat Protection: A built-in temperature sensor (PT100) and Buchholz relay (oil transformer) provide early warning and trip protection.

3.Excellent safety performance

Dry-type: Flame-retardant, self-extinguishing, explosion-proof, and pollution-free, these devices can be installed directly at load centers, such as indoors, in high-rise buildings, and in crowded locations.

Oil-immersed: Equipped with safety components such as a pressure relief valve and gas relay, the oil tank utilizes a sealed or fully enclosed structure to effectively prevent oil aging.

4.Strong environmental adaptability

High protection levels (e.g., IP23 for drip protection and IP45 for dust and water jet protection) allow for use in harsh environments such as dust and humidity.

Diverse cooling methods (ONAN, ONAF, OFAF, etc.) meet diverse heat dissipation requirements.

Indoor or outdoor designs are available upon request.

5.Low noise and low vibration

By optimizing the core joint process and shock absorption device, the noise and vibration during operation are effectively controlled, meeting environmental protection requirements. It is especially suitable for noise-sensitive areas (such as hospitals, schools, and residential areas).

1. Iron core:

Typically constructed from laminated silicon steel sheets, they provide a low-reluctance path for magnetic flux (main and leakage flux).

The core of a three-phase transformer consists of three legs, each wound with the high-voltage and low-voltage windings for one phase.

Core structures are primarily categorized as core-type and shell-type, with the core-type structure being the most common in power transformers.

2.Winding：

High-voltage windings: These windings have many turns and a smaller conductor cross-sectional area, corresponding to higher voltage levels.

Low-voltage windings: These windings have fewer turns and a larger conductor cross-sectional area, corresponding to lower voltage levels.

Windings can be arranged on the core in two ways: concentric (high and low voltage windings are concentrically wrapped around a single core leg, with the low voltage winding inside and the high voltage winding outside) and interleaved (high and low voltage windings are alternately stacked). The concentric arrangement is more widely used.

3. In addition, the transformer also includes important components such as oil tank (oil-immersed), insulating bushing, cooling device, oil storage cabinet (oil pillow), safety airway (pressure relief valve) and gas relay (Buchholz relay).

1. Maximum ambient temperature: +40°C

2. Minimum ambient temperature: -35°C

3. Altitude: <2000m

4. Average monthly relative humidity: 90% (20°C)

Q: Can your products be customized?

A: Considering the differences in voltage, frequency, and other characteristics of transformer products across different countries and regions, our products can be customized to your requirements.

Q: Why choose SDKC?

A: Leverage our OEM/ODM capabilities for customized solutions. Enjoy competitive pricing and volume discounts. Experience fast shipping and customs clearance support. Get comprehensive project solutions.

Q: What are the key parameters for commissioning a three-phase transformer?

A: Pre-power-on visual inspection, nameplate parameter verification, and internal inspection (if permitted).

The core of commissioning involves testing winding insulation resistance and absorption ratio/polarization index, winding DC resistance, voltage ratio and connection group, and winding dielectric loss factor (tan δ) in a power-off state.

Q: What product tests are performed on three-phase transformers before shipment?

A: Factory testing is a systematic and standardized process. Its core process can be summarized as follows:

Insulation property inspection → Winding integrity inspection → Performance parameter verification → Dielectric strength assessment → Accessory function confirmation

After all these tests are completed, a detailed factory test report will be generated.

Q: What types of transformers do you offer?

A: We offer solutions tailored to different sectors, such as mining power, new energy, and explosion-proof applications.

Q: What are your strengths?

A: Over 10 years of experience, advanced production equipment, consistent quality, fast delivery, and professional, high-quality, and timely service. We can also provide you with free parts.

Q: What are the standard packaging options?

A: We typically use sturdy wooden boxes or containers for protection.

Conclusion：

We are a professional manufacturer with over 10 years of experience in electrical equipment manufacturing, specializing in transformers (both dry-type and oil-immersed), voltage stabilizers, regulators, switchgear, box-type substations, and other products. Our strict quality control system ensures unparalleled safety and quality, earning us an excellent reputation both domestically and internationally. Customer satisfaction is always our ultimate goal, and we are committed to providing sincere, meticulous, and satisfactory service. We sincerely invite you to visit our factory and establish a lasting partnership with us.

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