High-voltage molded coil transformer with horizontal air channels and manufacture method thereof
A technology of casting coils and high-voltage coils, which is applied in coil manufacturing, transformer/inductor cooling, transformer/inductor components, etc., can solve the problem of increasing radial thickness and axial height, increasing transformer manufacturing costs, and increasing coil radiation. To achieve the effect of reducing the cross-sectional area, increasing the radial thickness, and increasing the heat dissipation surface area
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Embodiment 1
[0037] A high-voltage coil manufacturing method for a high-voltage casting coil transformer with transverse air passages. When winding the coil, the winding mold is placed in a horizontal state (see Figure 5 ), on the winding mold, place the glass fiber grid plate pre-impregnated with epoxy resin and resin pre-impregnated resin at the position 2 of the glass fiber grid plate pre-impregnated with the coil, which is equivalent to the position of the inner surface encapsulation layer of the coil. First wind from the middle tap 1A to tap 3A and tap 5A until it reaches the external power grid terminal A of the entire coil; then wind from the middle tap 2A to tap 4A and tap 6A until it winds to the entire coil The end of the coil is X, and each turn of wire "S" bends into the next turn, and the axial dimension of each layer is the line width of each turn × the actual number of turns, and the end face planar coil occupies no more than one turn of the line width, or The continuous co...
Embodiment 2
[0041] A 10 / 0.4KV630KVA three-phase iron core with a plane layout, which is an epoxy-cast high-voltage coil with F-class insulation and heat resistance, and the temperature rise limit is 100K. Its structural dimensions are: core diameter φ221mm, core center distance 475mm, core window height 795mm, high voltage coil inner diameter φ372mm, outer diameter φ441mm, heat dissipation height 685mm, pressure plate spacer 4 width 50mm, three-phase high voltage load loss 3893 watts , the coil eddy current loss is 261 watts, and the total loss of the three-phase high-voltage coil is 4154 watts.
[0042] When the high-voltage coil of this transformer is wound into six sections, the three-phase iron core is arranged in a plane, the distance between the sections is 10 mm mm, and there is no transverse air passage, the axial heat dissipation surface area of each coil is: S 1 =π(372+441)×685×10 -6 =1.750m 2 ; heat load J 1 =4154 / (3×1.750)=791W / m 2 ;The calculated value of temperature ri...
Embodiment 3
[0048] The transformer described in Embodiment 2 is still a three-phase iron core arranged in a plane, and the design plan is adjusted appropriately, and the load loss distribution of the high and low coils is adjusted within the allowable temperature rise limit of the high and low coils, and the composite main gas The insulation structure of the main airway reduces the size of the main airway insulation, and the effect of material saving is more obvious.
[0049] The adjusted structural dimensions are: the diameter of the core is still φ221mm, the center distance of the core is 470mm, the height of the core window is 740mm, the composite main airway insulation structure is adopted, the inner diameter of the high-voltage coil is φ369mm, the outer diameter of the coil is φ437mm, and the heat dissipation height is 630mm. Six sections, 5 transverse air passages are set up, the distance between the sections is 10 mm, the thickness of the resin encapsulation on both sides of the int...
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