Generator insulation test device

Abstract

The utility model belongs to the technical field of generator tests, and discloses a generator insulation test device. The generator insulation test device comprises a first insulation assembly and a second insulation assembly, the first insulation assembly comprises a first insulation sleeve and a second insulation sleeve which are detachably connected with each other, the first insulation sleeve sleeves a neutral point sleeve of a generator, and the second insulation sleeve sleeves a neutral point short circuit bar of the generator. Therefore, the neutral point bushing and the neutral point short circuit bar are insulated from each other. The second insulation assembly comprises an insulation pillar, the insulation pillar is arranged in a neutral point wire expansion box of the generator in a supported mode, the height of the insulation pillar is adjustable, and one end, away from the neutral point wire expansion box, of the insulation pillar is supported on the neutral point short circuit bar so that the neutral point short circuit bar and the neutral point wire expansion box can be insulated. The generator insulation test device can realize insulation between the neutral point sleeve and the neutral point short circuit bar, is high in insulation strength, does not have creepage or breakdown risks, and can improve the safety and convenience of the test process.

Description

TECHNICAL FIELD

[0001] The utility model relates to generator test technical field especially relates to a generator insulation test device. BACKGROUND

[0002] The connection mode of the stator winding of the steam turbine generator is generally star connection, that is, the main outgoing line is divided into U, V and W three-phase outputs, and the neutral point is short-circuited through a short-circuiting bar. For a large steam turbine generator with a capacity of millions of kilowatts, the neutral point short-circuiting bar is often designed to be heavy, and must be cooled separately, and some generator manufacturers design the short-circuiting bar to be cooled by the stator cooling water.

[0003] The insulation performance of the generator stator winding and the outgoing line bushing directly determines whether the generator can operate normally. According to the requirements of the preventive test of the power equipment, in order to accurately evaluate the insulation performance of the generator stator, the power plant needs to test the insulation performance of the generator stator during the generator minor repair or major repair window, and the test items include insulation resistance test between different phases, DC voltage resistance and leakage current test between different phases, and AC voltage resistance test between different phases. When the generator interphase insulation test is carried out, the neutral point short-circuiting bar must be disassembled.

[0004] However, when the insulation test of the large generator with a capacity of more than millions of kilowatts is carried out, the neutral point short-circuiting bar is not convenient to disassemble, especially the frequent disassembly of the neutral point short-circuiting bar will cause damage to the insulation water guide pipe of the short-circuiting bar, and the risk of seal failure and water leakage accident is easy to occur.

[0005] Therefore, it is urgent to provide a new type of generator insulation test device to solve the above technical problems in the prior art. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a kind of generator insulation test device, realize the insulation between neutral point bushing and neutral point short-circuiting bar, insulation strength is high, there is no risk of creeping or breakdown, can improve the security and convenience of test process.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The generator insulation test device comprises a first insulation assembly and a second insulation assembly, the first insulation assembly comprises a first insulation sleeve and a second insulation sleeve which are detachably connected with each other, the first insulation sleeve is sleeved on a neutral point bushing of the generator, the second insulation sleeve is sleeved on a neutral point short-circuiting row of the generator, so as to insulate the neutral point bushing and the neutral point short-circuiting row; the second insulation assembly comprises an insulation support, the insulation support is arranged in a neutral point distribution box of the generator, the height of the insulation support is adjustable, and one end of the insulation support away from the neutral point distribution box is supported on the neutral point short-circuiting row, so as to insulate the neutral point short-circuiting row and the neutral point distribution box.

[0009] Optionally, the second insulation assembly further comprises a supporting bolt fixed in the neutral point distribution box, the bottom of the insulation support is in abutment with a supporting nut, and the supporting nut is threadedly connected to the supporting bolt.

[0010] Optionally, the supporting bolt is fitted into a supporting hole formed in the bottom of the insulation support.

[0011] Optionally, the bottom of the supporting bolt is fixed with a bearing base, and the bearing base is arranged on an inner bottom wall of the neutral point distribution box.

[0012] Optionally, the supporting nut is provided with a connecting rod, the connecting rod is threadedly connected with a self-locking screw rod, the self-locking screw rod is fitted with a self-locking nut, the self-locking nut is in abutment with the bottom of the connecting rod, and the bottom of the self-locking screw rod is in abutment with a top wall of the bearing base.

[0013] Optionally, the second insulation sleeve comprises a first insulation piece and a second insulation piece which are detachably connected with each other, the top of the first insulation piece is provided with a first connecting part, the first connecting part is detachably connected to the bottom of the first insulation sleeve, and the first insulation piece and the second insulation piece surround a containing space for containing the neutral point short-circuiting row.

[0014] Optionally, the first insulation sleeve comprises two third insulation pieces which are arranged opposite to each other, the two third insulation pieces surround a containing space for containing the neutral point bushing, and the two third insulation pieces are detachably connected with the first connecting part.

[0015] Optionally, the bottom of the third insulation piece is provided with a second connecting part, and the first connecting part is clamped between the two second connecting parts.

[0016] Optionally, the third insulation piece comprises a first insulation part and a second insulation part perpendicular to each other, the second insulation part is arranged at the bottom of the first insulation part, the bottom of the second insulation part is provided with the second connecting part, and the two first insulation parts and the two second insulation parts surround a containing space for accommodating the neutral point bushing.

[0017] Optionally, the first insulation assembly further comprises a plurality of insulation bolts, the insulation bolts are used for fixing the first insulation piece and the second insulation piece, or the insulation bolts are used for fixing the two third insulation pieces, or the insulation bolts are used for fixing the second connecting part and the first connecting part.

[0018] Advantages:

[0019] The generator insulation test device is provided with the first insulation assembly and the second insulation assembly, when the phase separation test of the generator is performed, the first insulation assembly insulates and separates the neutral point short-circuit row from the neutral point bushing, and the insulation support of the second insulation assembly insulates and separates the neutral point short-circuit row from the neutral point expansion box. That is, the neutral point short-circuit row of the generator is completely insulated and separated, so that the phase separation test of the generator can be completed without disassembling the neutral point short-circuit row. At the same time, since the first insulation assembly comprises the first insulation sleeve and the second insulation sleeve which are detachably connected to each other, and the height of the insulation support of the second insulation assembly is adjustable, the insulation performance of the neutral point short-circuit row and the neutral point bushing can be improved, and the generator insulation test device is suitable for neutral point short-circuit rows of different heights, and the convenience and the application range of use can be improved. The phase separation test of the stator of the generator is performed by the generator phase separation test device, the insulation between the neutral point bushing and the neutral point short-circuit row can be realized, the insulation strength is high, the insulation performance of the generator can be comprehensively evaluated, there is no risk of creeping or breakdown, the use safety is improved, and the process of disassembling the neutral point short-circuit row is omitted, the test efficiency is high, and the convenience of the test process can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic view of the generator insulation test device provided by the embodiment of the utility model;

[0021] Figure 2 is a structure schematic view of the second insulation assembly provided by the embodiment of the utility model;

[0022] Figure 3 is an exploded view of the second insulation assembly provided by the embodiment of the utility model;

[0023] Figure 4 is a front view of the first insulation assembly provided by the embodiment of the utility model;

[0024] Figure 5 is Figure 4 the longitudinal sectional view of A-A;

[0025] Figure 6 is a longitudinal sectional view of the second insulating sleeve provided by the embodiment of the present application;

[0026] Figure 7 is a longitudinal sectional view of the first insulating sleeve provided by the embodiment of the present application.

[0027] In the figure:

[0028] 11, neutral point bushing; 12, bushing water pipe; 13, neutral point short circuit row; 14, neutral point expansion box;

[0029] 100, first insulating assembly; 110, first insulating sleeve; 111, third insulating piece; 1111, first insulating part; 1112, second insulating part; 1113, second connecting part; 120, second insulating sleeve; 121, first insulating piece; 1211, first connecting part; 122, second insulating piece; 123, bolt mounting part; 130, insulating bolt;

[0030] 200, second insulating assembly; 210, insulating support; 211, support hole; 220, support bolt; 230, support nut; 240, bearing base; 250, connecting rod; 260, self-locking screw; 270, self-locking nut. DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, not all the structures.

[0032] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.Moreover, first feature is "on", "above" and "upper surface" of second feature includes that first feature is directly above and obliquely above second feature, or only indicates that horizontal height of first feature is higher than second feature.First feature is "under", "below" and "lower surface" of second feature includes that first feature is directly below and obliquely below second feature, or only indicates that horizontal height of first feature is less than second feature.

[0034] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" are terms of reference and orientation only and are made only to facilitate description and are not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operative in a particular orientation, and therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second", "third" and the like are only used to distinguish in the description and do not have special meanings.

[0035] Please refer to Figure 1 The generator insulation test device in the embodiment comprises a first insulation assembly 100 and a second insulation assembly 200, the first insulation assembly 100 comprises a first insulation sleeve 110 and a second insulation sleeve 120 which are detachably connected with each other, the first insulation sleeve 110 is sleeved on a neutral point bushing 11 of a generator, the second insulation sleeve 120 is sleeved on a neutral point short circuit row 13 of the generator, so that the neutral point bushing 11 and the neutral point short circuit row 13 are insulated, the second insulation assembly 200 comprises an insulation support 210, the insulation support 210 is arranged in a neutral point expansion box 14 of the generator, the height of the insulation support 210 is adjustable, one end of the insulation support 210 away from the neutral point expansion box 14 is supported on the neutral point short circuit row 13, so that the neutral point short circuit row 13 and the neutral point expansion box 14 are insulated.

[0036] The generator insulation test device insulates the neutral point short-circuit row 13 from the neutral point bushing 11 by setting the first insulation assembly 100 and the second insulation assembly 200, and insulates the neutral point short-circuit row 13 from the neutral point expansion terminal box 14 by the insulation support 210 of the second insulation assembly 200 when the phase separation test of the generator is performed. That is, the neutral point short-circuit row 13 of the generator is completely insulated and separated, so that the phase separation test of the generator can be completed without disassembling the neutral point short-circuit row 13. At the same time, since the first insulation assembly 100 includes the first insulation sleeve 110 and the second insulation sleeve 120 which are detachably connected to each other, and the height of the insulation support 210 of the second insulation assembly 200 is adjustable, the insulation performance of the neutral point short-circuit row 13 from the neutral point bushing 11 can be improved, and the neutral point short-circuit row 13 of different heights can be applied, so that the convenience and application range of use can be improved. The phase separation test of the stator of the generator is performed by the generator phase separation test device, the insulation between the neutral point bushing 11 and the neutral point short-circuit row 13 can be realized, the insulation strength is high, the insulation performance of the generator can be comprehensively evaluated, there is no risk of creeping or breakdown, the use safety is improved, and the process of disassembling the neutral point short-circuit row 13 is omitted, so that the test efficiency is high and the convenience of the test process can be improved.

[0037] In the embodiment, the first insulation sleeve 110 and the second insulation sleeve 120 are made of insulating plates, and are combined and installed between the first insulation sleeve 110 and the second insulation sleeve 120 without gaps, so that the reliability of the insulation can be improved.

[0038] As shown in Figure 2 and Figure 3 , the second insulation assembly 200 further includes a support bolt 220 fixed in the neutral point expansion terminal box 14, the bottom of the insulation support 210 abuts against a support nut 230, and the support nut 230 is threadedly connected to the support bolt 220. Since the support bolt 220 is fixed in the neutral point expansion terminal box 14, the height position of the support nut 230 can be changed by rotating the support nut 230 on the support bolt 220, so that the height adjustment of the insulation support 210 carried by the support nut 230 is realized, and the operation is simple and convenient.

[0039] In the embodiment, the support bolt 220 is fitted into the support hole 211 formed at the bottom of the insulation support 210. The support bolt 220 is fitted into the support hole 211 of the insulation support 210, so that the fixation of the insulation support 210 and the support bolt 220 is realized, and the insulation support 210 plays a positioning and guiding role, so that the insulation effect of the insulation support 210 is improved.

[0040] Further, the bottom of the supporting bolt 220 is fixed with a bearing base 240, which is arranged on the inner bottom wall of the neutral point distribution box 14. The bearing base 240 can fix the supporting bolt 220, and the supporting bolt 220 does not need to be fixed in the neutral point distribution box 14, so that the second insulation assembly 200 can be disassembled, and the experimental efficiency and the experimental operation convenience of the generator insulation test device are improved.

[0041] In an optional embodiment, the supporting nut 230 is provided with a connecting rod 250, the connecting rod 250 is threadedly connected with a self-locking screw 260, the self-locking screw 260 is connected with a self-locking nut 270, the self-locking nut 270 abuts against the bottom of the connecting rod 250, and the bottom of the self-locking screw 260 abuts against the top wall of the bearing base 240. After the supporting nut 230 is adjusted and fixed, the height of the self-locking screw 260 can be adjusted, so that the bottom of the self-locking screw 260 abuts against the top wall of the bearing base 240, and then the self-locking nut 270 is rotated and tightened to fix the self-locking screw 260. The friction force generated between the self-locking screw 260 and the bearing base 240 can prevent the supporting nut 230 from rotating on the supporting bolt 220, and the position of the supporting nut 230 is fixed.

[0042] In another optional embodiment, the difference from the above embodiment is that the supporting hole 211 of the insulation support 210 is also threadedly connected with the supporting bolt 220, so that the supporting nut 230 abuts against the bottom of the insulation support 210 and generates a friction force when the supporting nut 230 is tightened on the supporting bolt 220, thereby preventing the supporting nut 230 from rotating and fixing the supporting nut 230. Details are not described herein.

[0043] As shown in Figure 4 to Figure 6 The second insulation sleeve 120 includes a first insulation piece 121 and a second insulation piece 122 which are detachably connected in sequence, the top of the first insulation piece 121 is provided with a first connecting part 1211 which is detachably connected to the bottom of the first insulation sleeve 110, and the first insulation piece 121 and the second insulation piece 122 surround a containing space for containing the neutral point short-circuit row 13. The second insulation sleeve 120 is provided with the first insulation piece 121 and the second insulation piece 122 which are detachably connected in sequence, so that the second insulation sleeve 120 can be easily installed on the neutral point short-circuit row 13, the installation convenience is improved, the test efficiency is improved, and the insulation effect is better.

[0044] As shown in Figure 5 and Figure 7As shown, further, the first insulation sleeve 110 includes two third insulation members 111 arranged oppositely left and right, the two third insulation members 111 surround to form a containing space for containing the neutral point bushing 11, and the two third insulation members 111 are detachably connected with the first connecting part 1211. The first insulation sleeve 110 is arranged as two third insulation members 111 which are symmetrical left and right, so that the batch production of the first insulation sleeve 110 can be realized, the production efficiency is improved and the production cost is reduced, meanwhile, the first insulation sleeve 110 can be conveniently installed on the neutral point bushing 11, the convenience of installation is improved, so that the test efficiency is improved, and the insulation effect is better.

[0045] In the embodiment, the bottom of the third insulation member 111 is provided with a second connecting part 1113, and the first connecting part 1211 is clamped between the two second connecting parts 1113. Such arrangement can realize the fixation between the two third insulation members 111 and the first connecting part 1211 of the second insulation sleeve 120, respectively, and facilitate the assembly of the first insulation assembly 100.

[0046] Optionally, the first insulation assembly 100 further includes a plurality of insulation bolts 130, the insulation bolts 130 are used to fix the first insulation member 121 and the second insulation member 122, or the insulation bolts 130 are used to fix the two third insulation members 111, or the insulation bolts 130 are used to fix the second connecting part 1113 and the first connecting part 1211. The insulation bolts 130 are used to fix the first insulation member 121 and the second insulation member 122, fix the two third insulation members 111, and fix the second insulation sleeve 120 on the first insulation sleeve 110, respectively, so that reliable fixation effect can be realized, and the assembly efficiency in the test process is improved, so that the convenience and efficiency of the test are improved.

[0047] Further, the left and right sides of the first insulation member 121 and the second insulation member 122 are provided with bolt mounting parts 123, the bolt mounting parts 123 are used to pass the insulation bolts 130, so that the fixation of the insulation bolts 130 on the first insulation member 121 and the second insulation member 122 is realized.

[0048] As shown in FIG. 1, the first insulation assembly 100 includes a first insulation sleeve 110 and a second insulation sleeve 120. Figure 7As shown, optionally, the third insulation piece 111 comprises a first insulation part 1111 and a second insulation part 1112 which are perpendicular to each other, the second insulation part 1112 is arranged at the bottom of the first insulation part 1111, the bottom of the second insulation part 1112 is provided with the second connecting part 1113, and two first insulation parts 1111 and two second insulation parts 1112 surround a containing space for accommodating the neutral point bushing 11. That is, the longitudinal section of the third insulation piece 111 is L-shaped, and insulation between the neutral point short-circuiting row 13 and the bushing water guide pipe 12 (including the water inlet pipe and the water return pipe) can be realized, and meanwhile, auxiliary support is also achieved, so that the sealing of the bushing water guide pipe 12 is avoided from being damaged due to the drooping of the neutral point short-circuiting row 13 under the action of gravity, and the reliability and safety of the test process are further improved.

[0049] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent substitution and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A generator insulation test device, characterized by, The utility model relates to a generator neutral point insulation device, which comprises the following parts: a first insulation assembly (100) comprising a first insulation sleeve (110) and a second insulation sleeve (120) detachably connected to each other, the first insulation sleeve (110) being sleeved on a neutral point bushing (11) of a generator, and the second insulation sleeve (120) being sleeved on a neutral point short-circuit bar (13) of the generator to insulate the neutral point bushing (11) from the neutral point short-circuit bar (13); a second insulation assembly (200) comprising an insulation support (210) arranged in a neutral point distribution box (14) of the generator, the height of the insulation support (210) being adjustable, and one end of the insulation support (210) away from the neutral point distribution box (14) being supported on the neutral point short-circuit bar (13) to insulate the neutral point short-circuit bar (13) from the neutral point distribution box (14).

2. The generator insulation test device of claim 1, wherein, The second insulation assembly (200) further comprises a support bolt (220) fixed in the neutral point distribution box (14), and the bottom of the insulation support (210) is in abutment with a support nut (230) which is threadedly connected to the support bolt (220).

3. The generator insulation test apparatus of claim 2, wherein, The support bolt (220) is fitted into a support hole (211) formed at the bottom of the insulation support (210).

4. The generator insulation test apparatus of claim 2, wherein, The bottom of the support bolt (220) is fixed with a bearing base (240) which is arranged on the inner bottom wall of the neutral point distribution box (14).

5. The generator insulation test apparatus of claim 4, wherein, The support nut (230) is provided with a connecting rod (250), the connecting rod (250) is threadedly connected with a self-locking screw (260), the self-locking screw (260) is fitted with a self-locking nut (270) which is in abutment with the bottom of the connecting rod (250), and the bottom of the self-locking screw (260) is in abutment with the top wall of the bearing base (240).

6. The generator insulation test apparatus of claim 1, wherein, The second insulation sleeve (120) comprises a first insulation piece (121) and a second insulation piece (122) detachably connected to each other, the top of the first insulation piece (121) is provided with a first connecting part (1211) which is detachably connected to the bottom of the first insulation sleeve (110), and the first insulation piece (121) and the second insulation piece (122) enclose a containing space for containing the neutral point short-circuit bar (13).

7. The generator insulation test apparatus of claim 6, wherein, The first insulation sleeve (110) comprises two third insulation pieces (111) oppositely arranged on the left and right, the two third insulation pieces (111) enclose a containing space for containing the neutral point bushing (11), and the two third insulation pieces (111) are detachably connected with the first connecting part (1211).

8. The generator insulation test apparatus of claim 7, wherein, The bottom of the third insulation piece (111) is provided with a second connecting part (1113), and the first connecting part (1211) is clamped between the two second connecting parts (1113).

9. The generator insulation test apparatus of claim 8, wherein, The third insulation piece (111) comprises a first insulation part (1111) and a second insulation part (1112) perpendicular to each other, the second insulation part (1112) is arranged at the bottom of the first insulation part (1111), the bottom of the second insulation part (1112) is provided with the second connecting part (1113), and two first insulation parts (1111) and two second insulation parts (1112) are arranged to form a containing space for containing the neutral point bushing (11).

10. The generator insulation test apparatus of claim 9, wherein, The first insulation assembly (100) further comprises a plurality of insulation bolts (130), the insulation bolts (130) are used for fixing the first insulation piece (121) and the second insulation piece (122), or the insulation bolts (130) are used for fixing two third insulation pieces (111), or the insulation bolts (130) are used for fixing the second connecting part (1113) and the first connecting part (1211).

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