CN202503385U

CN202503385U - Large hydro generator stator bar

Info

Publication number: CN202503385U
Application number: CN2012201209716U
Authority: CN
Inventors: 梁艳萍; 孙玉田; 孙洋
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2012-03-28
Filing date: 2012-03-28
Publication date: 2012-10-24
Anticipated expiration: 2022-03-28

Abstract

The utility model discloses a large hydro generator stator bar, which is characterized in that the stator bar comprises an odd number of transposition plied yarns horizontally arranged as a left row and a right row and filling plied yarns arranged at the end part of the stator bar and used for maintaining the integrity of the stator bar, wherein the transposition plied yarns transpose in every half pitch, the end parts of the transposition plied yarns are welded together through an end joint sleeve, the outer surface of the transposition plied yarns is coated with insulating paint, and the transposition of the transposition plied yarns is provided with a glass ribbon gasket used for strengthening insulation protection. The stator bar achieves the advantage of traditional plied yarn arrangement modes, and meanwhile, circulation in the stator bar can be restrained, circulation loss can be reduced, and the utilization rate of a wiring duct can be further improved.

Description

A kind of large-sized water turbine generator stator bar

Technical field

The utility model relates to large-sized water turbine generator design and manufacturing technology field, is specifically related to a kind of stator bar that is applicable to large-sized water turbine generator.

Background technology

Stator bar is one of core component during motor is made, and the stator bar of large-sized water turbine generator mainly adopts bar formula line rod, and the kelvin effect of this line rod is apparent in view can to produce eddy current loss.In order to reduce the eddy current loss in the stator bar, traditional handicraft generally is divided into stator bar the strand of some thinner thicknesses, and the circulation in the strand can be by restriction effectively like this.Yet these strands by also headgear is welded together, make each root strand be in parallelly connected state in the end.Because every strand residing position in magnetic field is different, the magnetic flux of their interlinkages is also different, therefore, has electrical potential difference between the different strands, thereby causes forming between strand circulation.This circulation has not only increased the supplementary load loss of stator, and causes each strand temperature rise different, causes strand heat spot to occur easily, and this security of operation to generator is very unfavorable, is to cause the major reason that electric efficiency reduces, shorten useful life.

In order to eliminate or to reduce the caused loss of circulation, introduced strand transposition technology in the design of generator stator bar with in making usually, like the Roebel transposition method of initial use, and the less than 360 of appearance afterwards ^oTransposition, 0 °/360 °/0 ° add slot part void transposition section transposition, 0 °/360 °/0 ° and prolong transposition, 0 °/540 °/0 ° different strand interchanging methods such as transposition.These strand interchanging methods are widely used in obtaining good effect in the design and manufacturing of hydraulic generator, and strand transposition technology is also in development constantly.

Although the transposition form that the different water turbine generator possibly adopt is different; But traditional strand arrangement mode all is the every circles of stator bar to be formed in parallel by even number root strand; The reason that need replace owing to the stator bar straight line portion; The line rod highly all will exceed the height of a strand, has so just reduced the utilance of groove, has influenced the raising of generator efficiency.

For solving above-mentioned defective of the prior art, the utility model provides a kind of new solution.

Summary of the invention

The utility model technical problem to be solved is: how a kind of turbine generator stator bar is provided; This stator bar not only reaches the advantage of traditional strand arrangement mode; And can be good at suppressing the circulation in the stator bar, and reduce circulation loss, further improve the utilance of groove.

For reaching the foregoing invention purpose; The technical scheme that the utility model adopted is: a kind of stator bar is provided, it is characterized in that: said stator bar comprise by transversely arranged be about two row odd number root transposition strand be arranged on the filling strand that the stator bar end is used to keep the stator bar integrality; Said transposition strand replaces once in every half pitch, transposition strand end through and headgear weld together.

According to the stator bar that the utility model provided, it is characterized in that: said transposition strand outer surface is surrounded by insulating varnish.

According to the stator bar that the utility model provided, it is characterized in that: said transposition strand transposition is provided with the glass tape pad that is used for the reinforced insulation protection.

In sum, the stator bar that the utility model provided has following advantage than existing stator bar: 1, can realize the various transposition forms that traditional strand is arranged, and eddy current loss reduces in the strand; 2, the stator bar mechanical stress is little, and pliability is good, than being easier to processing; 3, the line of same size rod can strand of multi-parallel, the corresponding increase of line rod sectional area, and close the reducing of electricity, copper loss reduces, and can effectively improve the utilance of groove simultaneously, further reduces circulation loss; 4, can make the line rod reduce the height of a strand, play the effect that reduces by two strands, have bigger use value.

Description of drawings

Fig. 1 is the stereogram of stator bar when the strand number of share of stock is 21;

Fig. 2 is the Transposition Principle figure of stator bar when the strand number of share of stock is 21;

Fig. 3 is the vertical view of Fig. 1;

Fig. 4 is the cutaway view along A-A line among Fig. 3;

Fig. 5 is the cutaway view along B-B line among Fig. 3;

Fig. 6 is the cutaway view along C-C line among Fig. 3;

Fig. 7 is the cutaway view along D-D line among Fig. 3;

Fig. 8 is the cutaway view along E-E line among Fig. 3.

In all these sketch mapes, for the purpose of clarity, all adopt the stator bar of specific radical, but this transposition structure is applicable to the stator bar of any employing odd number root strand.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

As shown in Figure 1; This generator stator bar is made up of odd number root transposition strand; Transposition Principle is for through replacing a strand position of vacating, the strand of same height, and parallelly connected strand number has more one than the mode that adopts the transposition of even number root strand; Under same grooved size, compare the utilance that traditional strand interchanging method has improved groove.Can find out that in Fig. 1 left and right sides strand radical is different, the right side has more one than left side strand, and in production reality, the placement location of a strand that has more is decided by concrete grooved.

As shown in Figure 2, the transposition strand is made up of 21 strands, and wherein strand 0 dots and is empty strand (be void transposition place, do not have strand to exist) here here, and after through a series of strand transposition establishments, putting in order of stator strand rear and front end is constant.

To be example, the Transposition Principle of stator bar is at length explained below, like Fig. 3-shown in Figure 8 by 21 stator bars of constituting of transposition strands.

From Fig. 3, can find out; The A-A position is the initial period of stator strand transposition, and its sectional view is as shown in Figure 4, in Fig. 4, has 21 strands; Wherein strand 1 left side is void transposition place, and the Transposition Principle that this patent adopted utilizes this void transposition section to replace exactly.At the next position place is the B-B place, at this moment strand 1 is moved to the below of strand 21, and originally the position of strand 1 becomes void transposition place.In the C-C position, strand 2 is moved to the position of original strand 1, promptly new void transposition place moves to the strand of strand 2 tops the below of this strand simultaneously successively, makes original strand 11 places become void transposition place after moving like this.At the D-D place, strand 12 is shifted to the right to present void transposition place.At the next position E-E place, move a strands position on all strands with strand 13 and below thereof successively, make strand 1 position among former Fig. 7 become void transposition place.Other transpositions in this root stator bar, the transposition according to Fig. 4 to Fig. 8 replaces in proper order successively,, explains that these all strands of root line rod replace to finish when the same with position shown in Fig. 4 up to all strand evolutions.

This generator stator bar manufacture method mainly contains two kinds: a kind of method is with the strand bending, then with the strand alignment, and compression moulding, this method is fit to the less line rod of every circle strand number, because with respect to the transposition section start, each strand K value is different; Another kind method can replace when flat type copper wire is advanced at the enamel-cover flat type copper wire both sides relative set that constantly is drawn out of two cover transposition framves.Elder generation to pressing down, vacates the room with a strand on the throne, shifts a strand that will replace on the room onto then, and it is more obvious that this method suppresses venturi effect, uses more in the production.

With a 1000MW hydraulic generator is example, adopt the drain potential method respectively when adopting 80 strands of tradition transposition structure and adopting 81 strands of novel transposition structure strand circulation and loss compare.The result shows, adopts tradition transposition structure and the every line rod circulation loss result of calculation that adopts novel transposition Structure Calculation motor under full transposition form to be respectively 137.84W and 133.51W.Can find out that from result of calculation the circulation loss in the line rod of employing novel transposition structure obviously reduces.

The stator bar that the utility model provided not only can be realized the various transposition forms that traditional strand is arranged, and has the advantage of various traditional strand arrangement modes, can be good at suppressing the circulation in the stator bar, reduces the circulation loss in the strand; Simultaneously, fill strand more, improved the utilance of groove effectively owing in original teeth groove, increased by one.

The utility model has been to having done further explain by the embodiment of accompanying drawing illustrated embodiment, but the protection range that should not be construed as the utility model only limits to described instance.

Claims

1. stator bar is characterized in that: said stator bar comprise by transversely arranged be about two row odd number root transposition strand be arranged on the filling strand that the stator bar end is used to keep the stator bar integrality; Said transposition strand replaces once in every half pitch, transposition strand end through and headgear weld together.

2. stator bar according to claim 1 is characterized in that: said transposition strand outer surface is surrounded by insulating varnish.

3. stator bar according to claim 1 is characterized in that: said transposition strand transposition is provided with the glass tape pad that is used for the reinforced insulation protection.