10kV 20kV 35kV Cast Resin Dry Type Transformer

Epoxy resin cast dry-type transformer is a type of transformer in which the iron core and winding are not immersed in insulating liquid. The high-voltage winding is manufactured using epoxy resin vacuum casting technology, which has the characteristics of flame retardant, self extinguishing, environmental protection and pollution-free. This type of product is suitable for power supply systems with a rated capacity of 30kVA~25000kVA, a rated frequency of 50Hz, and voltage levels of 6kV, 10kV, 20kV, and 35kV. The main advantages are:

• Safety and fire prevention: Without using insulating oil, the risk of fire and explosion caused by oil leakage is fundamentally eliminated. The epoxy resin used is a flame-retardant material, which has extremely high flame retardancy after casting and meets the strict ten-year installation fire prevention regulations;
• Operational safety: It can be directly installed in the load center and usually does not require a dedicated fire extinguishing system to be configured;
• High reliability: The solid insulation layer formed by epoxy resin casting has excellent insulation strength, and its voltage resistance is much higher than that of air. At the same time, the cured coil forms a complete rigid body with high mechanical strength, strong resistance to short-circuit current impact and voltage resistance, and high operational reliability;
• Small partial discharge: using German HEDRICH vacuum casting equipment, the vacuum degree can reach 0.1mbar, ensuring no bubbles during the casting process, and the partial discharge capacity is ≤ 5pC;
• Long lifespan and stable operation: The oil-free environment avoids problems such as oil aging, with stable insulation performance and reasonable heat dissipation design, resulting in longer equipment lifespan and more reliable operation;
• Energy saving: The iron core adopts high-quality cold-rolled grain oriented silicon steel sheets and a 45 °fully inclined joint structure, significantly improving energy efficiency. The redesign optimized the magnetic flux path, reducing the magnetic resistance and eddy current losses at the iron core joints, thereby reducing no-load losses. Compared with traditional methods, the automatic cutting process can reduce 5% of no-load losses and 5dB of noise;
• Strong overload capacity: Under forced air cooling (AF) conditions, the output capacity can be increased by 50%, achieving short-term or emergency overload operation to meet temporary power supply needs during peak loads or accident situations;
• Strong environmental adaptability: The casting process completely encapsulates the coil with a solid insulation layer, providing excellent moisture, dust, and corrosion resistance. It can adapt to high humidity, high dust, or extremely harsh environments, ensuring long-term stable operation;
• Low noise: Adopting an elastic support structure for shock absorption, effectively reducing transformer noise. The noise of products with 2500kVA and below is controlled at around 50dB.

The SC(B) series epoxy resin casting dry- type transformer produced by our company has the following characteristics due to advanced design, high-quality materials, scientific formula, strict process and high-standard detection:

1. High voltage winding with copper wire, low voltage winding with copper wire or copper foil, glass fiber felt filled wrapping,vacuum state with no filling epoxy resin pouring, solidified after the formation of a solid cylinder, high mechanical strength, small partial discharge, high reliability;

2. Flame retardant, explosion-proof, no pollution of the environment. The insulating material such as glass fiber of winding coil has self extinguishing characteristic, and will not generate arcs due to short circuit;

3. The coil does not absorb moisture, and the iron core clip has special protective layer against corrosion, which can run in 100% relative humidity and other harsh environments. Discontinuous operation does not need to remove the tide;

4. High level of resistance to short circuit and lightning;

5. Inside and outside of the coil, the resin layer is thin, and the heat dissipation performance is good. Air cooling(AN) is usually used for cooling. For any protection grade transformer, air cooling system(AF) can be configured to improve short time overload and ensure safe operation;

6. Low loss, good electricity saving effect. Running economy, can avoid maintenance;

7. Small volume, light weight, less space occupation, low installation cost, no need to consider oil drain tank, fire protection and fire fighting facilities and standby power supply; 8. Because of the lack of fire and explosion, it can be installed in the load center and close to the electric point, thus reducing the cost of the line and saving the expensive low voltage facilities.

◆SC(B)9 Resin Insulated Dry-type Power Transformer Performance Parameter Table

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◆SC(B)12 Resin Insulated Dry-type Power Transformer Performance Parameter Table

◆SC(B)13 Resin Insulated Dry-type Power Transformer Performance Parameter Table

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