SG 3 Phase Dry-type Transformer

Zhejiang Yibaling Power Equipment Co., Ltd. is a manufacturer in China specializing in the production of SG 3 phase dry-type transformers. We have been dedicated to the field of transformers for over twenty years and possess extensive experience in the production and sale. Our products have excellent price advantages and high quality. The sales coverage is mostly in the Americas. We look forward to a deep cooperation with you.

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Product Description

Yibaling Factory's SG 3 phase dry-type transformer is a reliable energy hub designed for modern industrial power systems. It adopts a fully enclosed oil-free structure. The core part is composed of high-quality cold-rolled silicon steel sheets combined with an H-class insulation system.

This combination makes the transformer exceptionally robust. Whether it is subjected to high-temperature baking in the workshop, invasion of humid air, or dusty environments, it can work stably and basically requires no human maintenance.

The SG 3 phase dry-type transformer covers a capacity range of 10kVA to 2500kVA and supports various voltage combinations (such as 10kV/0.4kV, 6kV/0.69kV, etc.). It has excellent overload capacity and anti-short-circuit characteristics.

The low-loss and low-noise design not only meets the energy efficiency level one standard but is also suitable for green factories, data centers, and urban rail transit scenarios that have strict requirements for environmental protection and energy conservation.

Product Details

We pay attention to every detail:

The windings of the SG 3 phase dry-type transformer are vacuum impregnated and cured, with a protection level of up to IP54.

The iron core and coil use elastic buffer fixation to effectively suppress vibration and noise.

It can also be optionally equipped with temperature control, anti-condensation, and intelligent communication interfaces to achieve real-time status monitoring and predictive maintenance.

The Price Advantage of SG 3 phase dry-type Transformer

Advantages	Concrete Manifestations
Direct Procurement Cost	Benefiting from mature dry-type technology, domestic supply chains, and large-scale production, its initial purchase price is usually more competitive. For instance, the reference price for the 100kVA model is around 7,500 yuan, significantly lower than that of traditional oil-immersed types.
The Long-term Operating Electricity Cost	Utilizing high-quality cold-rolled silicon steel sheets and other low-loss materials, along with optimized design, it features high energy efficiency (typically ≥ 95%). This can significantly reduce electricity costs over long-term operation, making it particularly suitable for 24-hour continuous operation scenarios.
Extremely Low Maintenance Costs	The dry oil-free structure eliminates the need for regular inspection and replacement of insulating oil as in oil-immersed types, fundamentally avoiding the risk of oil leakage and related environmental and safety hazards, achieving virtually maintenance-free operation.
Savings in installation and usage costs	Compact size and light weight, no need for special oil pits or complex fire-fighting facilities. It can be installed close to the load center, saving cables, low-voltage power distribution facilities and factory space.
Reliability and risk cost	With a fully enclosed structure that is moisture-proof and dust-proof, and through processes such as epoxy resin casting, its mechanical strength is high and its ability to resist short circuits is strong. This reduces the risks of unplanned downtime and production losses.

The customization of SG 3 Phase Dry-type Transformer

1. Clearly define the details of the customer's requirements

- Rated capacity, primary/secondary voltage, frequency, connection group (e.g. Dyn11), impedance voltage, presence of ±2x2.5% tap adjustment.

- Installation location (indoor/outdoor, basement/floor), altitude, ambient temperature, humidity, presence of corrosive gases (chemical environment), explosive dust (coal mine, flour mill) or salt fog (coastal areas).

- Protection level: conventional IP20 (anti-particle) or IP23/IP54 (splash-proof, dust-proof), the latter requires special design.

- Shell material:

- Regular: High-quality cold-rolled steel plate, surface phosphating followed by powder coating.

- Corrosion-resistant: 304 or 316L stainless steel, suitable for food, medicine, coastal areas.

- Explosion-proof and high protection: Thickened steel plate or aluminum alloy, meeting special explosion-proof requirements, or requires fully sealed welding structure.

- Cooling method: Self-cooling (AN), air-cooling (AF), or forced air-cooling (with independent fan).

2. Confirm the plan + produce

Process stage	Process details
Core fabrication	1. Cutting: Silicon steel sheets are precisely cut using longitudinal and transverse cutting lines. 2. Assembly: The stepped stacking method is employed to reduce eddy current losses. 3. Fastening: High-strength channel steel and anti-loosening bolts are used for fastening to ensure low noise.
Winding manufacturing	1. Winding: Using a CNC winding machine in a constant temperature and humidity workshop to wind the coils, ensuring precise number of turns. 2. Pre-baking and VPI treatment: After the coils are pre-baked in a vacuum oven, they are sent to an impregnation tank for "vacuum pressure impregnation (VPI)": first, vacuum is applied to remove air bubbles, then the impregnating resin is injected, and finally, pressure is applied to ensure the resin thoroughly penetrates. 3. Drying: Under high-temperature conditions in a circulating hot air oven, the coils are dried to form an "armor-like" integrated insulator.
Final assembly	1. Assembly: Precisely insert the cured windings into the iron core. 2. Connection: Connect the leads with silver-plated or tin-plated copper strips to reduce contact resistance. 3. Accessories installation: Install temperature control (Pt100), fan, protective housing, etc.