Three Phase Isolation Transformer

The Class C non-encapsulated dry type power transformer with Grade C cores produced by UL recognized NOMEX® insulation system has a more reasonable structure, safety and reliability. environmental protection, energy saving. fire and explosion protection. antifouling. dust and moisture resistance, and overload capacity. Strong, small size, easy maintenance and other advantages. Advanced product design, reasonable structure, beautiful appearance, the main performance indicators are better than domestic standards. It is most suitable for use in environments with high fire protection requirements, large load fluctuations, and frequent overloaded operation. It is applicable to high-rise residential buildings, airports, stations, docks, subways, hospitals, power plants, metallurgical industries, shopping centers, residential areas and petrochemicals. Nuclear power plants, nuclear submarines and other places.

1: Safety
The transformer uses the C-class insulation system based on NOMEX® paper from DuPont, with a heat-resistant rating of 220°C. Itis characterized by flame retardancy, flame retardance, self-extinguishing, non-toxicity, and fire resistance.
Using advanced VPl equipment and vacuum pressure impregnation technology. UL recognized high-quality impregnating varnish and NOMEXR® solid paper to form a hybrid insulation system, excellent moisture resistance, so that the non-encapsulated open-type dry-type transformer is sufficient to withstand the intrusion of water. And have:
●High tensile strength and tear strength.
●High anti-friction and anti-cut through performance.
●High compressive strength guarantees stable and strong insulation structure under short circuit or other mechanical stress.
●The product has excellent moisture resistance, anti-fouling. dust, mildew, anti-salt spray and other excellent performance.
Small size and light weight. DuPont NOMEX® paper is used as the main insulation material, and it is used as the hybrid insulation system at the hottest point of the transformer. The product has a high heat-resistant grade, and the coil structure is non-encapsulated and open-type, and its heat dissipation effect is better, so the transformer is small in size and light weight.
Transformer main insulation NOMEXR paper has a very low dielectric constant (1.5-2.5), close to the dielectric constant of the surrounding air(≈1), uses NOMEX® paper over other insulating materials under the same withstand of the same electric field strength Can withstand more electric field strength, can make the air withstand lower electric field strength, can reduce the air insulation distance accordingly, make these parts can have smaller size, thus can reduce the external dimension of the transformer accordingly.
NOMEX Aromatic Polyamide Insulation is a globally recognized high-quality electrical insulation material with its low dielectric constant and cooling due to its heat resistance:
●Maintain long-term stability at 220°C.
●Can withstand short-term operation at a temperature of 350°C
●Maintains stable performance over a wide temperature and humidity range.
●Unable to melt, flow and oxidize at 250°C.
●No toxic or corrosive gas is released at a temperature of 750°C.

2: Reliable
The super nameplate has strong running ability, due to adopting new structure, new materials, new technology, good heat dissipation conditions, long thermal life, and strong overload capacity.
The use of high-quality electrical insulating material NOMEX® paper, electrical insulation and mechanical properties of long term stability, insulation material is not easy to aging, shrinkage and compression resistance, coupled with strong elasticity, good tear resistance and abrasion resistance. Therefore, it can be ensured that the coil remains tightly structured even after several years of use. and can withstand short circuit pressure.

3: Environmental protection
Transformer operation noise is 10 dB to 20 dB lower than national standards. No
environmental pollution occurs during manufacture, transportation, storage, or operation. The coils can be disassembled and recycled., which will not cause harm to the environment, protect the environment and meet the trend. It will not support combustion, can be flame retardant, will not explode, and will not release harmful gases below 750°C.

4: Low noise
To meet the city's dense population requirements for higher noise.

5: Energy saving
The use of three-dimensional coil core, in the transformer design technology. core structure, process improvement in-depth research, so that the dry voltage transformer no-load loss, no-load current and load loss have decreased and can save silicon steel and copper consumption, To achieve the best energy-saving effect with the least material.
Aligns with China's distribution transformer industry. the main development direction: First, energy-saving. miniaturization, the second is intelligent: the third is environmental protection, fourth is the improvement of reliability.

Using a three-dimensional triangle structure, the arrangement of the cores is more reasonably combined, and three identical single frames are used to synthesize a three-dimensional equilateral triangle. The three-phase magnetic circuits are fully symmetrical and equilateral length, ensuring the balance of three-phase power supply and greatly reducing the magnetic resistance, and the excitation current and no-load loss are significantly reduced.

Each single frame consists of several continuous windings of trapezoidal tapes of varying widths. When winding, the special winder automatically shifts the material belt to one side and performs an asymmetrical winding so that the cross section is inclined at an angle of30°. This ensures that when the three single frames are assembled, the joint surface is good.

The assembly fixtures are all specially designed to ensure that the coil core does not deform during annealing. shaping. etc.

The advantages of this structure are:

●Significant energy saving effect: The three-dimensional triangle coil core has no seams, that is, there is no high energy consumption area, and the high magnetic permeability characteristics of the high-quality core material can be fully utilized o minimize the loss caused by the air gap formed at the joint.

●Miniaturization: The space utilization coefficient is high, and the transformer adopts a triangular structure, so the volume is smaller than the conventional transformer, the structure is compact, the appearance is beautiful, and the area is small.

●Low noise: Since the three-dimensional triangle wound core is formed by winding several kinds of trapezoidal strips in order, silicon steel strips are closely wound, and the magnetic conductive direction of the silicon steel strip is completely consistent with the direction of

the magnetic core of the iron core, and the vibration during operation is small. It can solve the noise caused by the inconsistent magnetic circuit of the stacked iron core, and can reduce the noise to a minimum.

High-voltage coils use NOMEX® paper materials for low-oxygen, high-conductivity oxygen-free copper wires, and low-voltage coils adopt a foil-type (copper foil) coil structure, which is produced by a dedicated three-dimensional triangle-foil winding machine.

The high-voltage coil is a cake-type structure and uses comb-shaped stays to increase the heat dissipation and short-circuit resistance of the coil

The foil type coil cancels the helix angle of the coiled wire coil, improves the ability to withstand short-circuits and the ability to resist lightning strikes. The copper foil and the outlet row are welded on the welding platform by hydrogen arc welding machine. The welding seam is firm and reliable. The outlet row is locked with a special fixture so that the outlet row of the wound coil will not run. The winding machine has Tensioning device, the number of furs is controlled by the computer, the coils wound out have high precision and the size meets the technological requirements; one or more air channels can be set to dissipate heat quickly to meet the temperature rise requirement.

The above design improves heat dissipation and achieves the purpose of increasing mechanical strength and electrical strength.

NOMEX^® paper is used for both interlayer insulation and end insulation. After repeated baking, vacuum pressure impregnation and curing, the coil forms a whole.

The body adopts a pad compression structure and is equipped with a pull screw and a compression nail to ensure that the coil has sufficient pressing force in the axial direction.

Between the low voltage coil and the iron core, a good engineering insulation fixed, material is used as a support plate, that is, the coil is and the iron core is tightened. A silicone pad is placed between the coil and the pressure block to compress the coil, and an elastic buffer is placed between the core clamp and the coil to reduce the noise of the transformer.

Using advanced VPI equipment and vacuum pressure impregnation technology, UL recognized high-quality German Elantas impregnation and US NOMEX^® paper to form a hybrid insulation system to achieve improved moisture resistance and organic integrity of products, and further reduce product noise.

SG(B)11-RL Performance Parameters

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