Generator phase separation test device and method of use

Abstract

The present application relates to the technical field of generator, and discloses a kind of generator split-phase test device and its using method, and the generator split-phase test device includes first insulation component and second insulation component.The one end of first insulation component is connected with neutral point bushing, and the other end is connected with neutral point short-circuit row, and second insulation component includes insulation support, and insulation support is supported in neutral point expansion line box, and it is supported in neutral point short-circuit row.First insulation component insulates and separates neutral point short-circuit row with neutral point bushing, and insulation support insulates and separates neutral point short-circuit row with neutral point expansion line box, so that the split-phase test of generator can be completed without disassembling the neutral point short-circuit row of generator, the problem that the neutral point short-circuit row is difficult to disassemble due to its heavy weight is solved, and the problem that the sealing of generator stator cooling water pipeline fails due to disassembling neutral point short-circuit row is solved.The generator split-phase test device can comprehensively evaluate the insulation performance of generator, and the test procedure is simple, and the test efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generators, in particular to a generator phase separation test device and a use method thereof. BACKGROUND

[0002] The stator of a generator is an important component for a steam turbine generator to convert mechanical energy of a steam turbine into electrical energy. The stator winding generates an induced electromotive force under the action of a rotating magnetic field of a generator rotor, and the electrical energy is transmitted to a closed bus through a lead-through bushing, and is transmitted to a power grid through a step-up transformer configured in a power plant.

[0003] The connection mode of the stator winding of a steam turbine generator is generally star connection, that is, the main lead-through is divided into U, V and W three-phase outputs, and the neutral point is short-circuited through a short-circuiting bar. The insulation performance of the stator winding and the lead-through bushing of the generator directly determines whether the generator can operate normally. In order to accurately evaluate the insulation performance of the stator of the generator, the power plant needs to test the insulation performance of the stator of the generator during generator minor repair or major repair, 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. However, the neutral point short-circuiting bar must be removed during the generator phase-to-phase insulation test.

[0004] However, for a large-capacity steam turbine generator (such as a million-kilowatt capacity), due to the large current of the generator, the weight of the neutral point short-circuiting bar is also relatively large (the weight reaches 200 kg), therefore, the neutral point short-circuiting bar needs to be assisted by a lifting point and a hand-operated hoist for disassembly and assembly, which is extremely inconvenient, especially for a water-cooled neutral point short-circuiting bar, which involves sealing of a cooling water circuit, and there is a risk of sealing failure at the water pipe joint part of the neutral point short-circuiting bar during reassembly. Some power plants choose not to carry out insulation tests between different phases, which results in incomplete evaluation of the insulation performance of the stator winding and the lead-through bushing of the generator, and is not conducive to the safety of the generator.

[0005] Therefore, there is an urgent need for a generator phase separation test device and a use method thereof to solve the above problems. SUMMARY

[0006] Based on the above problems, the purpose of the present application is to provide a generator phase separation test device and a use method thereof, which can complete the phase separation insulation test of the stator winding of the generator without disassembling the neutral point short-circuiting bar, so as to comprehensively evaluate the insulation performance of the generator and improve the safety in use.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] On the one hand, a generator phase separation test device is provided, comprising:

[0009] a first insulation assembly, one end of the first insulation assembly is connected with a neutral point bushing of the generator, the other end is connected with a neutral point short circuit row of the generator, so as to insulate between the neutral point bushing and the neutral point short circuit row;

[0010] a second insulation assembly, including an insulation support, the insulation support is arranged in a neutral point distribution box of the generator, and one end of the insulation support away from the neutral point distribution box is supported on the neutral point short circuit row, so as to insulate between the neutral point short circuit row and the neutral point distribution box.

[0011] As a preferred scheme of the generator split-phase test device of the present application, the first insulation assembly includes a first insulation clamping part and a second insulation clamping part which are detachably connected, and a first installation cavity and a second installation cavity are defined between the first insulation clamping part and the second insulation clamping part, one end of the neutral point bushing is located in the first installation cavity, and the neutral point short circuit row is arranged in the second installation cavity.

[0012] As a preferred scheme of the generator split-phase test device of the present application, the first insulation clamping part and the second insulation clamping part each include a first plate and a second plate which are connected and arranged at an angle, the first plate extends along an axial direction of the neutral point bushing, and the second plate extends along an extension direction of the neutral point short circuit row.

[0013] First grooves are concavely arranged on the first plates of the first insulation clamping part and the second insulation clamping part, and the two first grooves surround to form the first installation cavity, and second grooves are concavely arranged on the second plates of the first insulation clamping part and the second insulation clamping part, and the two second grooves surround to form the second installation cavity.

[0014] As a preferred scheme of the generator split-phase test device of the present application, third grooves are concavely arranged on the first plates of the first insulation clamping part and the second insulation clamping part, the third grooves are communicated with the first grooves, the two third grooves surround to form an avoiding channel, and a first water return pipe of the neutral point bushing extends out through the avoiding channel and is located above the second plates.

[0015] As a preferred scheme of the generator split-phase test device of the present application, a first step structure is arranged on the edge of the second groove of the second plate of the first insulation clamping part, a second step structure is arranged on the edge of the second groove of the second plate of the second insulation clamping part, and the first step structure can be fitted with the second step structure.

[0016] As a preferred scheme of the generator split-phase test device of the present application, the first insulation assembly further includes a fastening assembly, and the first insulation clamping part and the second insulation clamping part are connected and fixed through the fastening assembly.

[0017] As a preferred scheme of the generator phase separation test device, the fastening assembly comprises an insulating bolt and an insulating nut, and the first insulating clamping part and the second insulating clamping part are both provided with a connecting hole, the insulating bolt penetrates the two connecting holes in sequence and is connected with the insulating nut.

[0018] As a preferred scheme of the generator phase separation test device, the second insulating assembly further comprises an insulating base connected with the insulating support, and the insulating support is placed on the inner bottom of the neutral point distribution box through the insulating base.

[0019] As a preferred scheme of the generator phase separation test device, an elastic insulating pad is arranged at the end of the insulating support away from the insulating base.

[0020] In another aspect, a method for using the generator phase separation test device is provided, which is applied to the generator phase separation test device as described above and comprises the following steps:

[0021] The insulating support is placed in the neutral point distribution box and supported below the neutral point short-circuit row;

[0022] The first connecting fitting between the neutral point bushing of the generator and the neutral point short-circuit row is removed;

[0023] The first insulating assembly is installed between the neutral point bushing and the neutral point short-circuit row after the first connecting fitting is removed;

[0024] The test line is connected to the second connecting fitting of the outgoing bushing of the generator, and the phase separation test is performed.

[0025] The generator phase separation test device and the method for using the same have the following beneficial effects:

[0026] The generator phase separation test device and the method for using the same have the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the contents of the embodiments of the present application and the drawings.

[0028] Figure 1 is a structural schematic view of the generator split-phase test device provided by the embodiment of the present application after being installed to the generator;

[0029] Figure 2 is a side view of the generator provided by the embodiment of the present application;

[0030] Figure 3 is a front view of the first insulation assembly provided by the embodiment of the present application;

[0031] Figure 4 is a top view of the first insulation assembly provided by the embodiment of the present application;

[0032] Figure 5 is a front view of the first insulation clamping part and the second insulation clamping part after being closed provided by the embodiment of the present application;

[0033] Figure 6 is a partial enlarged view of A in FIG. 1; Figure 1

[0034] Figure 7 is a structural schematic view of the second insulation assembly provided by the embodiment of the present application.

[0035] In the drawings:

[0036] 1-first insulation assembly; 2-second insulation assembly;

[0037] 11-first insulation clamping part; 12-second insulation clamping part; 13-fastening assembly; 14-first installation cavity;

[0038] 15-second installation cavity; 16-avoidance passage;

[0039] 111-first plate; 112-second plate;

[0040] 1111-first groove; 1112-third groove;

[0041] 1121-second groove; 1122-first step structure; 1123-second step structure;

[0042] 131-insulation bolt; 132-insulation nut; ​

[0043] 21-insulating support; 22-insulating base; 23-elastic insulating pad;

[0044] 100-neutral point bushing; 101-first return water pipe;

[0045] 200-neutral point short-circuiting bar; 201-water inlet pipe; 202-second return water pipe;

[0046] 300-neutral point expansion box; 400-first connecting fitting; 500-outlet bushing; 600-second connecting fitting. DETAILED DESCRIPTION

[0047] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects reached more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0048] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0049] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected; 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 communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] As Figures 1 to 7 shown, the present embodiment provides a generator split-phase test device for realizing the insulation test between the stator phases of the generator. The generator split-phase test device comprises a first insulation assembly 1 and a second insulation assembly 2.

[0051] Among them, refer to Figure 1, one end of the first insulation assembly 1 is connected with the neutral point bushing 100 of the generator, and the other end is connected with the neutral point short-circuiting row 200 of the generator, so as to insulate the neutral point bushing 100 and the neutral point short-circuiting row 200. The second insulation assembly 2 comprises an insulation support 21, the insulation support 21 is arranged in the neutral point distribution box 300 of the generator, and one end of the insulation support 21 away from the neutral point distribution box 300 is supported on the neutral point short-circuiting row 200, so as to insulate the neutral point short-circuiting row 200 and the neutral point distribution box 300. The arrangement of the insulation support 21 can support the neutral point short-circuiting row 200, and prevent the water inlet pipe 201 and the second water return pipe 202 of the neutral point short-circuiting row 200 from being deformed and damaged due to the self-weight sinking of the neutral point short-circuiting row 200.

[0052] The generator split-phase test device provided by the embodiment can insulate and separate the neutral point short-circuiting row 200 and the neutral point bushing 100 through the first insulation assembly 1, and insulate and separate the neutral point short-circuiting row 200 and the neutral point distribution box 300 through the insulation support 21 of the second insulation assembly 2 when the split-phase test of the generator is performed. That is, the neutral point short-circuiting row 200 of the generator is completely insulated and separated, so that the split-phase test of the generator can be completed without disassembling the neutral point short-circuiting row 200. Therefore, the problem that the neutral point short-circuiting row 200 is difficult to disassemble due to the large weight is solved, and the problem that the sealing of the generator stator cooling water pipe is invalid due to the disassembly and assembly of the neutral point short-circuiting row 200 is also solved. The split-phase test of the generator stator can comprehensively evaluate the insulation performance of the generator, improve the use safety, and save the process of disassembling and assembling the neutral point short-circuiting row 200, so that the test steps are simple and the test efficiency is high.

[0053] Optionally, referring to Figure 3 , the first insulation assembly 1 comprises a first insulation clamping part 11 and a second insulation clamping part 12 which are detachably connected, and the first insulation clamping part 11 and the second insulation clamping part 12 define a first installation cavity 14 and a second installation cavity 15 which are independent of each other, one end of the neutral point bushing 100 is located in the first installation cavity 14, and the neutral point short-circuiting row 200 is arranged in the second installation cavity 15. The first installation cavity 14 is used for limiting and fixing the lower end of the neutral point bushing 100, and the second installation cavity 15 is used for limiting and fixing the neutral point short-circuiting row 200, so that the relative position of the neutral point bushing 100 and the neutral point short-circuiting row 200 is unchanged, and the connection is firm. Since the first installation cavity 14 and the second installation cavity 15 are independent of each other, the electrical insulation and separation between the neutral point short-circuiting row 200 and the neutral point bushing 100 can be realized, and the split-phase insulation test is facilitated.

[0054] Optionally, referring to Figure 3 , Figure 4 and Figure 5, the first insulation clamping part 11 and the second insulation clamping part 12 each comprise a first plate 111 and a second plate 112 connected and arranged at an included angle, the first plate 111 extends along the axial direction of the neutral point bushing 100, and the second plate 112 extends along the extension direction of the neutral point short-circuiting row 200. Further, the first plate 111 of the first insulation clamping part 11 and the first plate 111 of the second insulation clamping part 12 are each concavely provided with a first recess 1111, and the two first recesses 1111 are arranged to form a first mounting cavity 14, and the second plate 112 of the first insulation clamping part 11 and the second plate 112 of the second insulation clamping part 12 are each concavely provided with a second recess 1121, and the two second recesses 1121 are arranged to form a second mounting cavity 15. Referring to the orientation in Figure 5 , the first mounting cavity 14 extends along the vertical direction, and the neutral point bushing 100 is inserted into the first mounting cavity 14 through the upper opening of the first mounting cavity 14. The second mounting cavity 15 extends along the direction perpendicular to the paper surface in Figure 5 , so that the neutral point short-circuiting row 200 can be arranged in the second mounting cavity 15. After the first insulation clamping part 11 and the second insulation clamping part 12 are connected and fixed, the lower end of the neutral point bushing 100 is limited in the first mounting cavity 14, and the neutral point short-circuiting row 200 is limited in the second mounting cavity 15, thereby realizing the insulation connection between the neutral point bushing 100 and the neutral point short-circuiting row 200.

[0055] In the embodiment, the first plate 111 and the second plate 112 are L-shaped to adapt to the relative connection position of the neutral point bushing 100 and the neutral point short-circuiting row 200, and the second plate 112 is designed to extend along the extension direction of the neutral point short-circuiting row 200, so that the second plate 112 can assist in supporting the neutral point short-circuiting row 200, preventing the neutral point short-circuiting row 200 from being deformed downward due to gravity, and avoiding damage to the connection sealing property at the water inlet pipe 201 and the second water return pipe 202 of the neutral point short-circuiting row 200.

[0056] Optionally, a buffer pad layer is arranged on the inner wall of the first recess 1111, which can avoid rigid contact between the neutral point bushing 100 and the inner wall of the first recess 1111, and prevent the plated layer on the neutral point bushing 100 from falling off. Preferably, the buffer pad layer is a rubber sheet attached to the inner wall of the first recess 1111, and the plated layer on the neutral point bushing 100 is a silver plated layer. The rubber sheet has good elasticity and a long service life.

[0057] Optionally, refer to Figure 3 and Figure 5, the first plate 111 of the first insulation clamping part 11 and the first plate 111 of the second insulation clamping part 12 are both concavely provided with third grooves 1112, the third grooves 1112 are communicated with the first grooves 1111, two third grooves 1112 are provided to form an avoiding channel 16, the first water return pipe 101 of the neutral point sleeve 100 extends out through the avoiding channel 16 and is located above the second plate 112. Referring to the position in Figure 5 , the avoiding channel 16 extends along the direction perpendicular to the paper and is communicated with the first installation cavity 14, as shown in Figure 1 and Figure 6 , the first water return pipe 101 extends out through the avoiding channel 16. The avoiding channel 16 can avoid the interference between the first insulation clamping part 11 and the second insulation clamping part 12 and the first water return pipe 101, and avoid affecting the connection sealing of the first water return pipe 101. Since the second plate 112 extends along the extension direction of the neutral point short circuit row 200, the second plate 112 can insulate and separate the first water return pipe 101 from the neutral point short circuit row 200, and realize the complete electrical isolation of the neutral point short circuit row 200.

[0058] Optionally, referring to Figure 3 , Figure 4 and Figure 5 , the second plate 112 of the first insulation clamping part 11 is provided with a first step structure 1122 at the edge of the second groove 1121, the second plate 112 of the second insulation clamping part 12 is provided with a second step structure 1123 at the edge of the second groove 1121, and the first step structure 1122 can be embedded with the second step structure 1123. Through the embedding of the first step structure 1122 and the second step structure 1123, the first installation cavity 14 and the second installation cavity 15 can be independent of each other, realizing the closed insulation of the two spaces and ensuring the complete electrical isolation of the neutral point sleeve 100 and the neutral point short circuit row 200. In the embodiment, the first step structure 1122 is arranged on the upper and lower two side edges of the second groove 1121 of the first insulation clamping part 11, and the second step structure 1123 is arranged on the upper and lower two side edges of the second groove 1121 of the second insulation clamping part 12, and the two first step structures 1122 and the two second step structures 1123 are embedded one by one to ensure the airtightness of the second installation cavity 15.

[0059] Optionally, referring to 3 and Figure 4 , the first insulation assembly 1 further comprises a fastening assembly 13, and the first insulation clamping part 11 and the second insulation clamping part 12 are connected and fixed through the fastening assembly 13. The arrangement of the fastening assembly 13 realizes the detachable connection of the first insulation clamping part 11 and the second insulation clamping part 12, facilitates the installation and disassembly of the first insulation assembly 1 between the neutral point short circuit row 200 and the neutral point sleeve 100, and realizes the insulation of the neutral point short circuit row 200 and the neutral point sleeve 100.

[0060] In this embodiment, the fastening assembly 13 comprises an insulating bolt 131 and an insulating nut 132, and the first insulating clamp 11 and the second insulating clamp 12 are both provided with connecting holes (not shown in the figure), and the insulating bolt 131 penetrates the two connecting holes in sequence and is connected with the insulating nut 132. As shown in Figure 1 and Figure 6 , when the first insulating assembly 1 is installed, the first insulating clamp 11 and the second insulating clamp 12 are respectively placed on the front and back sides of the neutral point bushing 100, the first recess 1111 is opposite to the neutral point bushing 100, the second recess 1121 is opposite to the neutral point short-circuiting row 200, the first insulating clamp 11 and the second insulating clamp 12 are relatively spliced, then the shank of the insulating bolt 131 penetrates the connecting holes of the first insulating clamp 11 and the second insulating clamp 12 in sequence, and the neutral point bushing 100 and the neutral point short-circuiting row 200 are connected firmly and insulated after the insulating nut 132 is tightened, as shown in Figure 5 and Figure 6 .

[0061] Further, referring to Figure 4 and Figure 5 , the fastening assembly 13 further comprises an insulating gasket, which is sleeved on the insulating bolt 131 and clamped between the insulating nut 132 and the first plate 111. The insulating gasket can increase the contact area between the insulating nut 132 and the first plate 111, prevent the insulating nut 132 from loosening, and improve the connection stability.

[0062] Preferably, the two side edges of the first plate 111 of the first insulating clamp 11 and the first plate 111 of the second insulating clamp 12 are both provided with connecting holes, and the two sides of the first insulating clamp 11 and the second insulating clamp 12 are fastened and connected by the insulating bolt 131 and the insulating nut 132, and the neutral point bushing 100 is located between the two insulating bolts 131, as shown in Figure 4 and Figure 5 . Further, each side edge of the first plate 111 is provided with three connecting holes, and each side of the first insulating clamp 11 and the second insulating clamp 12 is connected by three insulating bolts 131 and insulating nuts 132, which improves the connection stability.

[0063] Alternatively, referring to Figure 1 and Figure 7 , the second insulating assembly 2 further comprises an insulating base 22 connected with the insulating support 21, and the insulating support 21 is placed on the inner side bottom of the neutral point distribution box 300 through the insulating base 22. The arrangement of the insulating base 22 can stably place the insulating support 21 in the neutral point distribution box 300, so as to stably support the neutral point short-circuiting row 200 and prevent the water inlet pipe 201 and the second water return pipe 202 of the neutral point short-circuiting row 200 from being deformed and damaged due to the self-weight sinking.

[0064] In the embodiment, the insulating support 21 and the insulating base 22 are both made of epoxy resin, which has good insulation performance and high strength, can meet the support strength requirement, and can realize complete electrical isolation between the neutral point short-circuit row 200 and the neutral point expansion terminal box 300.

[0065] Optionally, referring to Figure 7 , the end of the insulating support 21 away from the insulating base 22 is provided with an elastic insulating pad 23. The elastic insulating pad 23 can avoid rigid contact between the neutral point short-circuit row 200 and the insulating support 21, ensure elastic support between the insulating support 21 and the neutral point short-circuit row 200, and allow the neutral point short-circuit row 200 to slightly sink. In the embodiment, the elastic insulating pad 23 is preferably a rubber pad, which has good insulation effect and good elasticity and can play an elastic support role.

[0066] The embodiment also provides a use method of the generator split-phase test device, which is applied to the generator split-phase test device and includes the following steps:

[0067] S1, placing the insulating support 21 in the neutral point expansion terminal box 300 and supporting the insulating support 21 below the neutral point short-circuit row 200 (as shown in Figure 1 );

[0068] S2, removing the first connecting hardware 400 between the two neutral point bushings 100 of the generator and the neutral point short-circuit row 200;

[0069] S3, installing the first insulating assembly 1 between the neutral point bushing 100 and the neutral point short-circuit row 200 after the first connecting hardware 400 is removed (as shown in Figure 1 );

[0070] S4, connecting the test line to the second connecting hardware 600 of the outgoing bushing 500 of the generator to perform the split-phase test (as shown in Figure 2 ).

[0071] Before step S1, the following steps are further included:

[0072] S01, checking whether the surfaces of the first insulating clamping part 11, the second insulating clamping part 12, and the insulating support 21 have cracks, and ensuring that the surfaces of the three parts are free of cracks to avoid affecting the insulation effect;

[0073] S02, wiping the surfaces of the first insulating clamping part 11, the second insulating clamping part 12, and the insulating support 21 with anhydrous ethanol to further ensure the insulation effect;

[0074] S03, evenly applying vaseline on the surface of the rubber pad to soften the rubber pad and ensure the elastic support effect of the rubber pad.

[0075] In steps S2 and S3, as Figure 1 Figure 1 As shown, firstly, remove the first connecting hardware 400 between the leftmost neutral point bushing 100 and the neutral point short-circuit bus 200. Then, take a first insulating component 1 and install it between the neutral point bushing 100 and the neutral point short-circuit bus 200. Next, remove the first connecting hardware 400 between the rightmost neutral point bushing 100 and the neutral point short-circuit bus 200, and take a first insulating component 1 and install it between the neutral point bushing 100 and the neutral point short-circuit bus 200. When installing the first insulating component 1, splice the first insulating clamping part 11 and the second insulating clamping part 12 so that the lower end of the neutral point bushing 100 extends into the first mounting cavity 14, while the first return water pipe 101 extends through the clearance channel 16, and the neutral point short-circuit bus 200 passes through the second mounting cavity 15.

[0076] In this embodiment, the first connecting fitting 400 and the second connecting fitting 600 are respectively the Haval fittings of the neutral point bushing 100 and the outgoing bushing 500, which serve to transmit mechanical loads and electrical loads.

[0077] After the phase separation test is completed, the following steps are also included:

[0078] S5. Disassemble the first insulating component 1 and reinstall the first connecting hardware 400 in the corresponding position;

[0079] S6. Use a DC resistance tester to measure the phase-to-phase DC resistance of UV, VW, and UW through the second connecting fitting 600 of the outgoing bushing 500.

[0080] S7. Compare the DC resistance values ​​of the two first connecting hardware 400 of the neutral point short circuit bus 200 before disassembly and after installation to determine whether the contact resistance of the first connecting hardware 400 of the neutral point short circuit bus 200 after installation is qualified.

[0081] S8. After the DC resistance test is passed, remove the second insulation component 2.

[0082] In step S5, when installing the first connecting hardware 400, the torque is tightened according to the design requirements to ensure that the tightness of the first connecting hardware 400 is consistent before and after disassembly.

[0083] In step S7, it should be ensured that the deviation of the DC resistance value of the first connecting hardware 400 before disassembly and after installation does not exceed 1%, indicating that the contact resistance of the first connecting hardware 400 of the neutral point short circuit bus 200 after installation is qualified and can avoid overheating and burning due to high contact resistance.

[0084] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made thereto without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A generator phase-separation test device, characterized in that, include: The first insulating component (1) has one end connected to the neutral point bushing (100) of the generator and the other end connected to the neutral point short-circuit busbar (200) of the generator, so as to insulate the neutral point bushing (100) from the neutral point short-circuit busbar (200); The second insulation component (2) includes an insulation support (21) which is installed inside the neutral point expansion box (300) of the generator. One end of the insulation support (21) away from the neutral point expansion box (300) is supported on the neutral point short-circuit busbar (200) to insulate the neutral point short-circuit busbar (200) from the neutral point expansion box (300). The second insulation component (2) also includes an insulation base (22) connected to the insulation support (21). The insulation support (21) is placed on the inner bottom of the neutral point expansion box (300) through the insulation base (22). The first insulation component (1) includes a first insulation clamping part (11) and a second insulation clamping part (12) that are detachably connected. The first insulation clamping part (11) and the second insulation clamping part (12) define a first mounting cavity (14) and a second mounting cavity (15) that are independent of each other. One end of the neutral point bushing (100) is located in the first mounting cavity (14), and the neutral point short circuit bus (200) passes through the second mounting cavity (15).

2. The generator phase-separation test apparatus according to claim 1, characterized in that, Both the first insulating clamping part (11) and the second insulating clamping part (12) include a first plate (111) and a second plate (112) that are connected and arranged at an angle. The first plate (111) extends along the axial direction of the neutral point bushing (100), and the second plate (112) extends along the extension direction of the neutral point short circuit bar (200). The first plate (111) of the first insulating clamping part (11) and the first plate (111) of the second insulating clamping part (12) are both recessed with a first groove (1111), and the two first grooves (1111) surround to form the first mounting cavity (14). The second plate (112) of the first insulating clamping part (11) and the second plate (112) of the second insulating clamping part (12) are both recessed with a second groove (1121), and the two second grooves (1121) surround to form the second mounting cavity (15).

3. The generator phase-separation test apparatus according to claim 2, characterized in that, The first plate (111) of the first insulating clamping part (11) and the first plate (111) of the second insulating clamping part (12) are both recessed with a third groove (1112). The third groove (1112) communicates with the first groove (1111). The two third grooves (1112) surround each other to form a clearance channel (16). The first return water pipe (101) of the neutral point sleeve (100) extends through the clearance channel (16) and is located above the second plate (112).

4. The generator phase-separation test apparatus according to claim 2, characterized in that, The second plate (112) of the first insulating clamping part (11) has a first step structure (1122) at the edge of the second groove (1121), and the second plate (112) of the second insulating clamping part (12) has a second step structure (1123) at the edge of the second groove (1121). The first step structure (1122) can be fitted with the second step structure (1123).

5. The generator phase-separation test apparatus according to claim 1, characterized in that, The first insulating component (1) further includes a fastening component (13), and the first insulating clamping part (11) and the second insulating clamping part (12) are connected and fixed by the fastening component (13).

6. The generator phase-separation test apparatus according to claim 5, characterized in that, The fastening assembly (13) includes an insulating bolt (131) and an insulating nut (132). Both the first insulating clamping part (11) and the second insulating clamping part (12) are provided with connecting holes. The insulating bolt (131) passes through the two connecting holes in sequence and is connected to the insulating nut (132).

7. The generator phase splitting test apparatus according to claim 1, characterized in that, An elastic insulating pad (23) is provided at the end of the insulating support (21) away from the insulating base (22).

8. A method for using a generator phase-separation test apparatus, applicable to the generator phase-separation test apparatus as described in any one of claims 1-7, characterized in that, Includes the following steps: The insulating support (21) is placed inside the neutral point expansion box (300) and supported below the neutral point short-circuit bus (200); Remove the first connecting fittings (400) between two of the neutral point bushings (100) of the generator and the neutral point short-circuit bus (200); The first insulating component (1) is installed between the neutral point bushing (100) and the neutral point short-circuit busbar (200) after the first connecting hardware (400) has been removed. Connect the test line to the second connecting fitting (600) of the generator's outlet bushing (500) to conduct a phase-separation test.

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