66kV is indoor, the outdoor type dry-type voltage inductor
The utility model belongs to the high-tension transformation equipment in the electric power system, is the crucial signal transmission equipment of electric power system electric energy metrical and relaying protection.
At present, plain edition oil immersed type voltage transformer is suitable for using indoor and outdoor, and its insulation system mostly is insulating paper and transformer oil compound inslation, and volume is big and heavy, and inflammable, contaminated environment can not be directly installed on load center.Chinese patent ZL 98251827.7 discloses a kind of " outdoor type dry-type voltage inductor "; this voltage transformer adopts the insulating protective layer of the outdoor type epoxy resin of moulding by casting as voltage transformer; its bushing surface casting becomes full skirt corrugated; special-purpose closed terminal box is installed at secondary leading-out terminal place; miniaturization, no oiling, totally-enclosed, non-maintaining, unattended operation have been reached; and can expose the purpose of installation in the open; but this instrument transformer only can be applicable to the electrical network of 10kV voltage, can be punctured immediately when moving on 66kV voltage electrical network.
The purpose of this utility model be to provide a kind of can be indoors or outdoor use, the voltage transformer that can on the 66kV electrical network, move again.
In order to achieve the above object; the utility model adopts outdoor type epoxy resin to pour into a mould the insulating protector of voltage transformer under vacuum environment; in order to increase product along the face creepage distance; and reach the requirement of IV level gradation for surface pollution; the alternate full skirt of 18-26 layer size is made in the insulation protection surface; its cross section is oval, and gamp width a is 1.3-1.5 with the ratio of umbellule width b.The high pressure winding adopts the coiling of pagoda shape, and design has electrostatic shielding, electrostatic shielding end increase grading ring.The high pressure winding adopts tandem formula structure, and promptly the high pressure winding is divided into two equal segments, and on two stem stems up and down of iron core, secondary winding and residual voltage winding are then on following stem stem respectively.In order to make winding reduce leakage reactance, up and down on the iron core column again respectively around a balance winding, realize forcing dividing potential drop, make high voltage be divided into two voltages that evenly reduce half, make insulation thickness also can corresponding reduction half.
More firm for the primary connection plate is installed, with three bolted, can prevent effectively that the primary connection plate from making its loosening and rotation because of conductor tension between primary connection plate and the primary connection terminal.
In order to increase the sealing property between primary connection terminal and the insulating protector, between primary connection terminal and the insulating protector with the O-ring seals sealing, prevent that insulating protector and primary connection terminal from ftractureing after, rainwater or impurity enter.
For the ease of the oil immersed type voltage transformer is changed, the installing hole size of the primary connection plate at insulating protector top can be general with the oil immersed type voltage transformer.
For the convenience of installation and transportation, the channel-section steel support that the utility model installs and fixes usefulness is equipped with 4 M10 lifting bolts, brings great convenience for the transporting and hoisting of product.
Because the utility model adopts outdoor type epoxy resin to replace plain edition epoxy resin to make insulating protective layer; make voltage transformer have the ability of ultraviolet radiation resisting, weathering resistance erosion; no oiling, fire-retardant, antipollution purpose have been realized, long-time running under can be the out of doors full weather conditions.Compare with the 10kV voltage transformer; the utility model is owing to adopted the insulating protector of special shape and forced the winding construction of dividing potential drop; a little less than making electric field strength like this; insulation system is more reasonable, can guarantee the requirement of the electrical insulation properties that the utility model moves on the 66kV electrical network, and can reduce the distance of structure relatively; reduce the volume of product; thereby reach under same insulation level economical with materials, the purpose that reduces cost.
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is a front view of the present utility model.
Fig. 2 is an end view of the present utility model.
Fig. 3 is a vertical view of the present utility model
As shown in Figure 1 and Figure 2, on the stem stem up and down of iron core 12 respectively around a balance winding 11, high pressure winding 2 is pressed the coiling of pagoda shape, adopt tandem formula structure, respectively on two stem stems up and down of iron core 12,9 of secondary winding 10 and residual voltage windings can make 12 of iron cores be with a half voltage on following stem stem like this.All there is electrostatic shielding 8 in the high pressure winding 2 of last stem stem and residual voltage winding 9 outsides of following stem stem, and there is grading ring 1 in the outside of electrostatic shielding 8.Adopt outdoor type epoxy resin to pour into a mould the insulating protector 14 of voltage transformer under vacuum environment, insulating protector 14 surface castings become 22 layers of full skirt that size is alternate, and its cross section is oval, and gamp width a is 1.4 with the ratio of umbellule width b.Insulating protector 14 tops are terminal block 5 once; its installing hole size and oil immersed type voltage transformer are general; with O-ring seals 7 sealings, three bolts 15 are fastened on primary connection plate 5 on the primary connection terminal 6 in a triangle between insulating protector 14 and the primary connection terminal 6.The secondary connection box 3 of a cast aluminium all-sealed structure respectively is housed before and after insulating protector 14 bottoms, can effectively prevents to avenge, the intervention of materials such as rain, dirt.In insulating protector 14 bottoms channel-section steel support 13 is arranged, 4 M10 lifting bolts 4 are housed on the channel-section steel support 13, be convenient to the transportation and the lifting of product.
The utility model is used for when indoor, can adopt indoor type epoxy resin to replace outdoor type poured with epoxy resin insulating protector, reduces the cost of raw material.