CN103457380A - Stator end structure of surge generator - Google Patents
Stator end structure of surge generator Download PDFInfo
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- CN103457380A CN103457380A CN2013103793208A CN201310379320A CN103457380A CN 103457380 A CN103457380 A CN 103457380A CN 2013103793208 A CN2013103793208 A CN 2013103793208A CN 201310379320 A CN201310379320 A CN 201310379320A CN 103457380 A CN103457380 A CN 103457380A
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Abstract
The invention relates to a stator end structure of a surge generator. According to the stator end structure of the surge generator, an electric conduction balancing structure is adopted to enable an inner shielding ring, an outer shielding ring and a nonmagnetic conical ring to form an integral shielding effect, the leakage reactance of a stator end is made to be minimized, the purpose of the maximization of short-circuit currents is achieved, and the phenomenon of temperature rise due to loss is reduced; a conformal strip plate combined auxiliary fixing structure and a conformal strip plate combined auxiliary fixing structure with a segregating conical barrel are adopted to fix an upper layer winding bar and a lower layer winding bar temporarily to prevent deformation stress from being generated, an ideal pouring channel is also formed, the quality of poured toughness epoxy filling materials is ensured, the purpose that the end portion of a winding is fixed reliably is achieved, and the problem that a product cannot meet the design requirement and the requirement for the service life due to the fact that previous schemes cannot be implemented ideally is solved.
Description
Technical field: the present invention relates to a kind of surge generator stator end structure.
Background technology: surge generator is different from conventional generator, its operation characteristic be exactly the whole service operating mode be all the transient process in suddenly-applied short circuit, be equivalent to the conventional generator accident conditions, structural design should guarantee that generator can provide shock test required large electric current, the stator end structure should be able to be born frequent huge electric power and be impacted, and possesses high reliability reaching in the useful life period of 30 or 40 years; As patent, ' as described in surge generator ZL200710144310.0 ': " surge generator belongs to special power generator; different from conventional generator; surge generator is not the generation mode operation with long-term stable state, but offer the power transmission and transformation key equipments such as transformer, circuit breaker and switch, detects the power supply of test with the large electric current of temporary impact.Surge generator can not uninterruptable power generation, and the shock test power-on time duration is no more than several seconds zero point, and impulse current can be up to hundreds thousand of amperes (effective value), and each experiment all is equivalent to the main lead-in wire outlet port accident short circuit of conventional generator.Main lead-in wire outlet port short circuit (belonging to accident condition) occurs once in conventional generator, just may destroy stator winding fixed structure or other members because of the electromagnetic force that short circuit current produces; Frequently circuit breaker etc. being made to short circuit test is the normal operating mode of surge generator, so electric power that its armature structure is hit is huge, stator winding is fixing must be very solid and reliable, and the instantaneous powerful torsion electric power during equally due to short circuit also has specific (special) requirements to the design of rotor structure.Popular explanation can say that surge generator is the generator with continuously serious accident state operation, offer thus determined object with high-energy destruction temporary impact curtage, to detect the limit capacity of bearing of determined object, so the 6500MVA surge generator has designed a series of special structures combination effectively, with the reliability requirement that meets self long-time running and the requirement that reaches operating characteristic."; Claims narration: " stator adopts the stator winding (7) of whole basket end of individual layer, and stator winding end is equipped with copper shield (5), and in stator, trim ring (1) and outer trim ring (6) are fixed together stator winding end, the inner epoxy resin of filling with "; The embodiment narration: " inside and outside copper shield structure is reliably fixing by stator winding, to reducing end leakage reactance, obvious effect is arranged, and this structure also makes end can form firmly overall structure simultaneously.Adopt nonmagnetic metal external pressing circle, set up copper shield structure 5, interior trim ring adopts the brass casting structure, has equally shielding action, and winding overhang firmly is clipped between inside and outside trim ring 6, and coil nose is accommodated in the teeth groove at position, interior trim ring termination.End winding hypotenuse gap-fill conformal gasket, end winding and nose be the epoxy glue perfusion of special formulation for all spaces between inside and outside trim ring, and this epoxy glue can not produce contraction crack and possess the enough toughness that tolerates operational shock power at solidification process.Winding overhang is fixed to a solid integral body ";
Rating formula P by surge generator
3=U
0 2/ X
d" also can find out in certain outlet voltage U
0requirement under, wish improves outlet short-circuit power P
3, must be by reducing X
d" realize, and affect X
d" the biggest factor be exactly the leakage reactance of Stator End Winding, so reduce surge generator reactance and the firm stator winding end comprise the Stator End Winding leakage reactance, be to ensure that surge generator can reach the key issue of design rating reliability service.
' the stator winding end structure that surge generator ZL200710144310.0 ' narrates is perfect not for patent, project organization and details do not fully take into account the influencing factors such as actual mismachining tolerance, implementation and operation, in actual applications and fall flat, and not yet in effect reaching ' guarantees that generator can provide shock test required large electric current ' and the purpose of ' the stator end structure should be able to be born frequent huge electric power and be impacted ', its reason has three aspects:: first, due to factors such as machining deformations, nonmagnetic metal external pressing circle and interior trim ring can not guarantee that all faying faces are reliably closely connected, form desirable electrical connection, can't form the low resistance shielding construction of continuous coating, make the leakage reactance of stator winding end exceed design value so that can't realize the large electric current of temporary impact of expected design value, and nonmagnetic metal external pressing circle and the part of interior trim ring be undesirable, and to contact the resistance of faying face larger, powerful shielding induced current produces the loss heating at this, produce the contact faying face and burn phenomenon and local overheating phenomenon, the insulation property of harm stator winding and supporting construction, affect the useful life of generator, second, ' end winding hypotenuse gap-fill conformal gasket ' can't guarantee filling quality, these conformal gaskets are limited by present position, can not be estimated or indirectly be measured its tightness or compressed degree, foozle and discreteness can cause the regional gap length to differ, and the thickness of conformal gasket can't change by actual gap, stator winding can not reliably and uniformly be supported by conformal gasket, cause the subregion underbraced or form gap, during operation, stator winding is subject to the electrodynamic action deformed damaged, the subregion support force is excessive, make stator winding be subject to excessive lasting prestressing force, with when operation stator winding be subject to the electric power stack may produce minor insulation to damage, affect the useful life of generator, the 3rd, can't guarantee the pouring quality of ' end winding and nose be the epoxy glue perfusion of special formulation for all spaces between inside and outside trim ring ', this is because epoxy glue has certain viscosity, mobility is not good, can't enter small gap, cause the part space existed between inside and outside trim ring not filled by epoxy glue, form permanent cavity or gap, project organization is not considered the exhaust structure of perfusion epoxy glue process yet, cause vapour lock, form the pore that perfusion epoxy glue interior size differs, gap, short texture, thereby can't reach the purpose of ' winding overhang is fixed to a solid integral body ', causing the stator winding local location to lack supports, can't bear huge impact electric power, cause end winding insulation and supporting construction damage, shortened the useful life of generator, design deficiency based on above-mentioned three aspects:, this patent structure can not be given full play to technical performance and the requirement in useful life of designed product, makes the product of applying its art designs manufacture have to reduce using property data or not reach service life.
Summary of the invention: the purpose of this invention is to provide a kind of practicable surge generator stator end structure, assurance makes the surge generator of designed production reach that the expected design parameter index requires and the requirement in useful life, reaches the purpose of ' guaranteeing that generator can provide shock test required large electric current ' and ' the stator end structure should be able to be born frequent huge electric power and be impacted '.
Technical scheme of the present invention is: the stator winding end consisted of the top bar of whole, lower bar is taper, form stressed supportive body structure at the cast copper shading ring of stator winding end inboard and the nonmagnetic conical ring in the outside, attach copper external shield ring in the nonmagnetic conical ring in the outside, the nonmagnetic conical ring in inboard cast copper shading ring, copper external shield ring and the outside forms shielding construction by balanced conductive structure; Inboard multilayer NHN composite insulating foil, the conformal bar-plate combination auxiliary fixing structure of liner between NHN composite insulating foil and lower bar pasted of copper external shield ring; Between top bar and lower bar, liner is with the conformal bar-plate combination auxiliary fixing structure of isolation cone cylinder; Inboard multilayer NHN composite insulating foil, the conformal bar-plate combination auxiliary fixing structure of liner between NHN composite insulating foil and top bar pasted of cast copper shading ring; Space perfusion tough epoxy packing material between the nonmagnetic conical ring in cast copper shading ring and the outside; The cast copper shading ring with the insulation bolt in accordance with regulations moment tightly on nonmagnetic conical ring, dentate stripe composition surface conduction transition plate is pressed between the contact-making surface of cast copper shading ring and nonmagnetic conical ring and copper external shield ring by pressure in accordance with regulations, make whole contact-making surfaces form the complete contact zones of intensive bar shaped, make the conductive effect equilibrium of whole contact-making surface, whole contact resistance is little.
Technique effect: because the technical program has retained the top bar of whole, the stator winding end that lower bar forms is taper, nonmagnetic conical ring in the cast copper shading ring of stator winding end inboard and the outside forms the general structure frame of stressed supportive body structure, and between inboard cast copper shading ring and copper external shield ring and nonmagnetic conical ring by the connection of balanced conductive structure formation ideal conducting, formed the bulk shielding structure, balanced conductive structure can adapt to the factors such as machining deformation, make nonmagnetic metal external pressing circle and interior trim ring can guarantee that all faying faces are reliably closely connected, form desirable electrical connection, make the leakage reactance decrease of stator winding end, reach designing requirement, realize the large electric current of temporary impact of expected design value, make properties of product obtain Reliable guarantee, nonmagnetic metal external pressing circle is very little with the resistance that the part of interior trim ring contacts faying face, approach the shield effectiveness of continuous bulk shielding structure, decrease the shielding induced current produce herein the loss fever phenomenon, thoroughly avoid the contact faying face to produce and burnt phenomenon and local overheating phenomenon, guarantee the long-term stability of the insulation property of stator winding and supporting construction, guaranteed the useful life of generator, owing to attaching copper external shield ring in the nonmagnetic conical ring in the outside, the inboard multilayer NHN composite insulating foil of pasting of copper external shield ring, multilayer NHN composite insulating foil has also been pasted in cast copper shading ring inboard, by the excellent insulation property of NHN composite insulating foil and the structure of multi-layer intercrossed place mat, guarantee the insulation against ground performance of stator winding, avoided electric discharge phenomena Damage to insulation structure, and due to the conformal bar-plate combination auxiliary fixing structure of liner between NHN composite insulating foil and top bar and lower bar and on, between lower bar liner with the conformal bar-plate combination auxiliary fixing structure of isolation cone cylinder, this pads conformal bar-plate combination auxiliary fixing structure and has suitable curing front elasticity and support force with the conformal bar-plate combination auxiliary fixing structure of isolating the cone cylinder, can make top bar and lower bar can access suitable holding power and keep the correct front initial position of perfusion tough epoxy packing material, nor can as structure in the past, make, lower bar produces excessive distortional stress, conformal bar-plate combination auxiliary fixing structure and also formed desirable perfusion path with the conformal bar-plate combination auxiliary fixing structure of isolation cone cylinder, desirable exhaust channel is provided, coordinate necessary process for filling colloid into flow process, conscientiously guarantee desirable pouring quality, make the inner pore-free of tough epoxy glue of perfusion, gap and short texture phenomenon, firm and globality is strong, reach the purpose of ' winding overhang is fixed to a solid integral body ', stator winding is coated and fixed continuously reliably, there is no initial deformation stress, can bear huge impact electric power, avoid end winding insulation and supporting construction damage, guarantee that generator reaches the useful life of expection, the ingenious combination of innovating thin section structure makes former scheme reach the distillation of matter, reached the actual effect that conventional art does not reach, this invention is from realizing electric parameter and reliably fixing two aspects, realize that the stator end leakage reactance minimizes with end construction solid and reliable stable, avoid heating to damage, thereby guaranteed the successful implementation manufactured and designed of the surge generator of 6500MVA capacitance grade and larger single-machine capacity.
The accompanying drawing explanation:
Fig. 1 is surge generator stator end structural representation of the present invention.
Fig. 2 is partial structurtes feature schematic diagram.
Fig. 3 is conduction transition plate schematic diagram.
Fig. 4 is conduction transition plate section configuration schematic diagram.
Fig. 5 is conduction transition plate section configuration distortion schematic diagram.
Fig. 6 is conduction transition plate contact condition schematic diagram.
Fig. 7 is bolt insulation schematic diagram.
Fig. 8 is perfusion path schematic diagram.
The E-E partial sectional view that Fig. 9 is Fig. 2.
The S-S partial sectional view that Figure 10 is Fig. 9
The X-X partial sectional view that Figure 11 is Fig. 9
Figure 12 is conformal bar-plate combination auxiliary fixing structure.
The right view that Figure 13 is Figure 12.
Figure 14 is the conformal bar-plate combination auxiliary fixing structure with isolation cone cylinder.
The right view that Figure 15 is Figure 14.
Figure 16 is conformal batten schematic diagram.
Embodiment:
As shown in Figure 1,3 ones, the stator winding end consisted of the top bar of whole 1, lower bar 2 is taper, form stressed supportive body structure at the cast copper shading ring 4 of stator winding end 3 inboards and the nonmagnetic conical ring 5 in the outside, the copper external shield ring 6 of the interior attaching of nonmagnetic conical ring 5 in the outside, the nonmagnetic conical ring 5 in inboard cast copper shading ring 4, copper external shield ring 6 and the outside forms shielding construction by balanced conductive structure 7; Inboard multilayer NHN composite insulating foil 8, the conformal bar-plate combination auxiliary fixing structure 9 of liner between NHN composite insulating foil 8 and lower bar 2 pasted of copper external shield ring 6; Between top bar 1 and lower bar 2, liner is with the conformal bar-plate combination auxiliary fixing structure 10 of isolation cone cylinder; Inboard multilayer NHN composite insulating foil 8, the conformal bar-plate combination auxiliary fixing structure 9 of liner between NHN composite insulating foil 8 and top bar 1 pasted of cast copper shading ring 4; Space perfusion tough epoxy packing material 11 between the nonmagnetic conical ring 5 in cast copper shading ring 4 and the outside;
As shown in Figure 2, the bolt 13 of cast copper shading ring 4 use insulation in accordance with regulations moment tightly on nonmagnetic conical ring 5, dentate stripe composition surface conduction transition plate 12 is pressed between the contact-making surface of cast copper shading ring 4 and nonmagnetic conical ring 5 and copper external shield ring 6 by pressure in accordance with regulations, make whole contact-making surfaces form the complete contact zones of intensive bar shaped, make the conductive effect equilibrium of whole contact-making surface, whole contact resistance is little;
As shown in Figure 3, dentate stripe composition surface conduction transition plate 12 is thin plate-shaped structure, adopt the manufacture of fine copper material, contact-making surface has the texture of positive triangle serrated profile shape, tooth width D is 1/120～1/240 of contact-making surface length H and width W sum, thickness T is 5 times～10 times of tooth width D, contact-making surface is silver-plated, material hardness will be lower than contacted conductive metal structure, the occupation mode of similar pad, be sandwiched in faying face, during use, suffered optimum pressure is about 1/2～2/3 of self material yield;
As shown in Figure 4, the contact-making surface section original shape of dentate stripe composition surface conduction transition plate is positive triangle zigzag N, contact-making surface is silver-plated, material hardness will be lower than contacted conductive metal structure, during use, suffered optimum pressure is about 1/2～2/3 of self material yield, make the material yield distortion at conduction transition plate spike position, dentate stripe composition surface, as shown in Figure 4, form the strip plane P, with the other side's contact-making surface close contact, the width in the strip plane of this close contact and adjacent strip gap is than depending on pressure suffered while using, the strip plane of the higher close contact of pressure is wider, in the process of the material yield distortion at dentate stripe composition surface conduction transition plate spike position, the thickness meeting attenuation of dentate stripe composition surface conduction transition plate, as shown in Figure 5, its thickness changes to final thickness B by original depth A, by data provided by the present invention, specifically apply, the numerical value of the thickness attenuation of dentate stripe composition surface conduction transition plate can be much larger than each parts structural strain's gap, as shown in Figure 6, make all to meet the strip plane M that scope has intensive reliable contact, can not produce the contact resistance non-uniform phenomenon,
As shown in Figure 7, because adopting the sleeve pipe 15 of insulating material and packing ring 14, bolt 13 implements reliably insulation, do not participate in conduction and screen effect, self can the conductively-closed current flow heats, avoided structure in the past to make resultant pressure is descended and ablated problem because bolt participates in conduction conductively-closed current flow heats expansion elongation, the thrust that bolt produces can not descend, meet and form the desirable required continuous of electrical connection, make the electric conductivity of each contact-making surface stable, make nonmagnetic metal external pressing circle, copper external shield ring and interior trim ring form desirable electrical connection by dentate stripe composition surface conduction transition plate, form the low resistance shielding construction coated continuously, reduce the leakage reactance of stator winding end, reach and guarantee that generator can provide the purpose of the required large electric current of shock test, give full play to technical performance and the requirement in useful life of designed product,
As shown in Figure 8, between NHN composite insulating foil and top bar and lower bar the conformal bar-plate combination auxiliary fixing structure 9 of liner and on, between lower bar liner with the conformal bar-plate combination auxiliary fixing structure 10 of isolation cone cylinder, this conformal bar-plate combination auxiliary fixing structure 9 and there is elasticity and support force before suitable solidifying with the conformal bar-plate combination auxiliary fixing structure 10 of isolation cone cylinder, can make top bar and lower bar can access suitable holding power and keep the correct front initial position of perfusion tough epoxy packing material, leak stopping ring 16 for operation before perfusion tough epoxy packing material, avoid the tough epoxy packing material outflow of perfusion, stator is in erectility, as shown in Figure 8, form perfusion path 17, the tough epoxy packing material of perfusion is along perfusion path 17 path flow, internal gas also is discharged from along this path, conscientiously guaranteed desirable pouring quality, make to pour into the inner pore-free of tough epoxy packing material, gap and short texture phenomenon, firm and globality is strong, reach the purpose of ' winding overhang is fixed to a solid integral body ', stator winding is coated and fixed continuously reliably, there is no initial deformation stress, can bear huge impact electric power, avoid end winding insulation and supporting construction damage, guarantee that generator reaches the useful life of expection, the ingenious combination of innovating thin section structure makes former scheme reach the distillation of matter, reached the actual effect that conventional art does not reach, this invention is from realizing electric parameter and reliably fixing two aspects, realize that end leakage reactance minimizes with end construction solid and reliable stable, avoid heating to damage, thereby guaranteed the successful implementation manufactured and designed of the surge generator of 6500MVA capacitance grade and larger single-machine capacity.
The E-E partial sectional view that Fig. 9 is Fig. 2, it is perfusion tough epoxy packing material flow path schematic diagram, 18 bore the tough epoxy packing material and the gas flow paths that up and down form of the conformal bar-plate combination auxiliary fixing structure 10 of cylinder at upper strata stator bar 1 for the conformal bar-plate combination auxiliary fixing structure 9 of pad reaches with isolation, and 20 is tough epoxy packing material and the gas flow paths between same layer stator bar;
The S-S partial sectional view that Figure 10 is Fig. 9, show upper strata stator bar state, and 21 is with the auxiliary cushion block between layer stator bar, and 22 is with perfusion tough epoxy packing material and gas flow paths between layer stator bar;
The X-X partial sectional view that Figure 11 is Fig. 9, show lower floor's stator bar state, and 23 is with the auxiliary cushion block between layer stator bar, and 24 is with perfusion tough epoxy packing material and gas flow paths between layer stator bar.
As shown in Figure 12 and Figure 13, conformal bar-plate combination auxiliary fixing structure 9 is formed the supporting construction of circular cone kenel by spaced conformal batten 25;
As shown in Figure 14, Figure 15, with the conformal bar-plate combination auxiliary fixing structure 10 of isolating the cone cylinder, by spaced conformal batten 25, stick on the supporting construction that isolation cone 26 an inside and outside both sides form the circular cone kenel;
As Figure 16 shows, conformal batten 25 forms conformal main body by the terylene felt 28 of the lath 27 winding dipping intermediate temperature setting epoxide-resin glues of laminated epoxy glass-cloth material, and form enclosed construction with heat-resistant rubber hose 29, avoid the intermediate temperature setting epoxide-resin glue to run off before solidifying;
Complete encapsulating, after the epoxy glue poured into solidifies, then the blowing hot-air operation is carried out in end, make the intermediate temperature setting epoxide-resin glue flooded in the terylene felt of conformal batten reach curing temperature required, complete whole operations.
Claims (2)
1. a surge generator stator end structure, it is characterized in that: the stator winding end (3) consisted of the top bar of whole (1), lower bar (2) is taper, at the cast copper shading ring (4) of stator winding end (3) inboard and the nonmagnetic conical ring (5) in the outside, forms stressed supportive body structure; Attach copper external shield ring (6) in the nonmagnetic conical ring (5) in the outside, the nonmagnetic conical ring (5) in inboard cast copper shading ring (4), copper external shield ring (6) and the outside forms shielding construction by balanced conductive structure (7); Inboard multilayer NHN composite insulating foil (8), the conformal bar-plate combination auxiliary fixing structure of liner (9) between NHN composite insulating foil (8) and lower bar (2) pasted of copper external shield ring (6); Between top bar (1) and lower bar (2), liner is with the conformal bar-plate combination auxiliary fixing structure (10) of isolation cone cylinder; Inboard multilayer NHN composite insulating foil (8), the conformal bar-plate combination auxiliary fixing structure of liner (9) between NHN composite insulating foil (8) and top bar (1) pasted of cast copper shading ring (4); Space perfusion tough epoxy packing material (11) between the nonmagnetic conical ring (5) in cast copper shading ring (4) and the outside; Moment is tightly upper at nonmagnetic conical ring (5) in accordance with regulations with the bolt (13) insulated for cast copper shading ring (4), and dentate stripe composition surface conduction transition plate (12) is pressed between the contact-making surface of cast copper shading ring (4) and nonmagnetic conical ring (5) and copper external shield ring (6) by pressure in accordance with regulations.
2. a kind of surge generator stator end structure according to claim 1, it is characterized in that: dentate stripe composition surface conduction transition plate (12) is thin plate-shaped structure, adopt the manufacture of fine copper material, contact-making surface has the texture of positive triangle serrated profile shape, tooth width D is 1/120～1/240 of contact-making surface length H and width W sum, thickness T is 5 times～10 times of tooth width D, contact-making surface is silver-plated, material hardness will be lower than contacted conductive metal structure, be sandwiched in faying face, during use, suffered optimum pressure is about 1/2～2/3 of self material yield.
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| CN2013103793208A CN103457380A (en) | 2013-08-28 | 2013-08-28 | Stator end structure of surge generator |
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| CN2013103793208A CN103457380A (en) | 2013-08-28 | 2013-08-28 | Stator end structure of surge generator |
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| CN2013103793208A Pending CN103457380A (en) | 2013-08-28 | 2013-08-28 | Stator end structure of surge generator |
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| CN106130257A (en) * | 2016-08-26 | 2016-11-16 | 哈尔滨电机厂有限责任公司 | stator end leakage magnetic flux barrier structure |
| CN109391062A (en) * | 2017-08-08 | 2019-02-26 | 通用电气公司 | Motor and its assemble method |
| CN112311158A (en) * | 2019-07-26 | 2021-02-02 | 广州广重企业集团有限公司 | End supporting device for hot pressing of generator rotor winding |
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| CN112311158B (en) * | 2019-07-26 | 2021-09-28 | 广州广重企业集团有限公司 | End supporting device for hot pressing of generator rotor winding |
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Application publication date: 20131218 |