Generator collector ring polarity conversion structure and method of use

Abstract

The application relates to the technical field of generators, in particular to a generator slip ring polarity conversion structure and a use method. The generator slip ring polarity conversion structure comprises an exciter assembly, the exciter assembly comprises a first positive busbar and a first negative busbar; a conversion assembly, the first positive busbar and the first negative busbar are electrically connected with the conversion assembly; a first wire and a second wire, one end of the first wire is electrically connected with the conversion assembly, and one end of the second wire is electrically connected with the conversion assembly; and an excitation busbar assembly comprising a second positive busbar and a second negative busbar, the second positive busbar is electrically connected with the first wire, the second negative busbar is electrically connected with the second wire, the second positive busbar can be electrically connected with a positive slip ring, and the second negative busbar can be electrically connected with a negative slip ring. The application can realize quick conversion of the polarity of the slip ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of generator technology, in particular to a generator slip ring polarity conversion structure and use method. BACKGROUND

[0002] The excitation mode of large steam turbine generator is divided into static excitation and rotating rectification excitation. The static excitation mode is widely used due to its simple device maintenance, short shaft system, fast excitation response speed and other characteristics. The main device components of the static excitation mode are slip ring, carbon brush and excitation bus. The working principle is that the excitation bus transmits direct current to the carbon brush through static components, the carbon brush and the rotating slip ring are in friction contact, the direct current is transmitted to the slip ring through the carbon brush, the slip ring is electrically connected with the generator rotor winding, and the direct current is passed into the generator rotor winding. Under the high-speed rotation of the rotating shaft, a rotating magnetic field is formed in the stator bore.

[0003] Although the main device components of the static excitation mode are few, the current passes through the contact surface of the carbon brush and the slip ring, and the current conduction surface changes constantly with the rotation of the rotor. Due to the high current density, the temperature of some contact points is high. At the same time, due to the gap arc between the carbon brush and the slip ring caused by the rotating shaft jump and other reasons, local high temperature is generated, which will cause the micro local melting and falling off of the two pole surfaces of the slip ring.

[0004] However, the wear of the slip ring is different due to the different polarity of the slip ring. In the negative pole of the slip ring, the electric field direction is the slip ring pointing to the carbon brush, and the copper ions migrate to the direction of the carbon brush, and the oxidation process is enhanced. On the contrary, the positive oxidation process is inhibited, which is the reason why the negative pole of the slip ring wears faster than the positive pole.

[0005] If the polarity of the excitation system direct current output is not replaced and long-term operation, it will cause uneven wear of the positive and negative poles of the slip ring. The contact state between the carbon brush and the slip ring with more serious wear deteriorates, the contact resistance increases, the temperature of the contact surface between the carbon brush and the slip ring rises, and in severe cases, an arc can be generated between the carbon brush and the slip ring, damaging the excitation equipment of the generator, causing the generator to be out of service, and causing huge economic losses to the nuclear power plant.

[0006] Therefore, a generator slip ring polarity conversion structure and use method are needed to solve the above problems. SUMMARY

[0007] The purpose of the present application is to provide a generator slip ring polarity conversion structure and use method, which can realize the rapid conversion of the polarity of the slip ring, achieve the purpose of balancing the wear of the positive and negative poles of the slip ring, prolong the service life of the slip ring, and improve the operation reliability of the slip ring and the carbon brush.

[0008] To achieve this purpose, the present application adopts the following technical solutions:

[0009] The generator collector ring polarity conversion structure comprises:

[0010] The excitation machine assembly comprises a first positive busbar and a first negative busbar;

[0011] The conversion assembly is electrically connected with the first positive busbar and the first negative busbar;

[0012] The first wire and the second wire are electrically connected with the conversion assembly at one end;

[0013] The excitation busbar assembly comprises a second positive busbar and a second negative busbar, the second positive busbar is electrically connected with the first wire, the second negative busbar is electrically connected with the second wire, the second positive busbar can be electrically connected with the collector ring of the positive electrode, and the second negative busbar can be electrically connected with the collector ring of the negative electrode;

[0014] The conversion assembly can electrically connect the first positive busbar with the second positive busbar, and electrically connect the first negative busbar with the second negative busbar; or electrically connect the first positive busbar with the second negative busbar, and electrically connect the first negative busbar with the second positive busbar.

[0015] Further, the conversion assembly comprises a first connecting piece and a second connecting piece arranged at intervals, the first connecting piece is electrically connected with the first positive busbar, the second connecting piece is electrically connected with the first negative busbar, the first connecting piece can be selectively electrically connected with the first wire or the second wire, and the second connecting piece can be connected with the first wire or the second wire which is not connected with the first connecting piece.

[0016] Further, a first axial conversion busbar is arranged between the first positive busbar and the first connecting piece, one end of the first axial conversion busbar is electrically connected with the first positive busbar, and the other end of the first axial conversion busbar is electrically connected with the first connecting piece.

[0017] Further, a second axial conversion busbar is arranged between the first negative busbar and the second connecting piece, one end of the second axial conversion busbar is electrically connected with the first negative busbar, and the other end of the second axial conversion busbar is electrically connected with the second connecting piece.

[0018] Further, a first isolation assembly is further arranged, and the first connecting piece and the first axial conversion busbar are clamped in the first isolation assembly.

[0019] Further, the first isolation assembly comprises two first insulating partitions arranged at intervals, and the two first insulating partitions are connected by a first insulating screw.

[0020] Further, the first insulating partition is provided with a heat dissipation groove.

[0021] Further, the second isolation assembly is further provided, and the second connecting element is clamped in the second isolation assembly.

[0022] Further, the second isolation assembly comprises two second insulating partitions arranged at intervals, and the two second insulating partitions are connected by a second insulating screw.

[0023] A use method for adjusting the polarity of the collector ring by using the generator collector ring polarity conversion structure as described above, comprising the following steps:

[0024] Normal polarity wiring:

[0025] The first positive busbar and the first negative busbar are electrically connected with the conversion assembly;

[0026] One end of the first wire is electrically connected with the conversion assembly, and one end of the second wire is electrically connected with the conversion assembly;

[0027] The second positive busbar is electrically connected with the first wire, and the second negative busbar is electrically connected with the second wire;

[0028] The conversion assembly electrically connects the first positive busbar with the second positive busbar, and electrically connects the first negative busbar with the second negative busbar;

[0029] The contact resistance of all connection parts should not be greater than 20 μΩ, and the insulation of the second positive busbar to the ground, the insulation of the second negative busbar to the ground, and the insulation between the second positive busbar and the second negative busbar are measured, and after the insulation is qualified, the generator can be put into operation;

[0030] Conversion polarity wiring:

[0031] The first positive busbar and the first negative busbar are electrically connected with the conversion assembly;

[0032] One end of the first wire is electrically connected with the conversion assembly, and one end of the second wire is electrically connected with the conversion assembly;

[0033] The second positive busbar is electrically connected with the first wire, and the second negative busbar is electrically connected with the second wire;

[0034] The conversion assembly electrically connects the first positive busbar with the second negative busbar, and electrically connects the first negative busbar with the second positive busbar;

[0035] The contact resistance of all connection sites should not be greater than 20 mu omega, and the insulation of the second positive busbar to the ground, the insulation of the second negative busbar to the ground and the insulation between the second positive busbar and the second negative busbar is qualified, and then the generator can be put into operation.

[0036] The beneficial effects of the present application are as follows:

[0037] The first positive busbar and the first negative busbar of the exciter are electrically connected with the conversion assembly, the conversion assembly is electrically connected with the second positive busbar and the second negative busbar through the first lead wire and the second lead wire, the first positive busbar is electrically connected with the second positive busbar, the first negative busbar is electrically connected with the second negative busbar by adjusting the conversion assembly, the normal work between the positive current collecting ring and the negative current collecting ring is realized, or the first positive busbar is electrically connected with the second negative busbar, the first negative busbar is electrically connected with the second positive busbar, and the polarity of the positive current collecting ring and the negative current collecting ring is exchanged. Through the above-mentioned mode, the polarity of the current collecting ring can be quickly converted, the purpose of balancing the wear of the positive and negative current collecting rings is achieved, the service life of the current collecting ring is prolonged, and the operation reliability of the current collecting ring and the carbon brush is improved.

[0038] The use method provided by the present application adjusts the polarity of the current collecting ring by using the generator current collecting ring polarity conversion structure, can quickly convert the polarity of the current collecting ring, achieves the purpose of balancing the wear of the positive and negative current collecting rings, prolongs the service life of the current collecting ring, and improves the operation reliability of the current collecting ring and the carbon brush. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a schematic view of the generator current collecting ring polarity conversion structure of the present application.

[0040] In the figure:

[0041] 1, first positive busbar; 11, first axial conversion bus; 2, first negative busbar; 21, second axial conversion bus; 3, first wiring part; 31, first lead wire; 4, second wiring part; 41, second lead wire; 5, second positive busbar; 6, second negative busbar; 7, first isolation assembly; 71, first insulating partition plate; 8, second isolation assembly; 81, second insulating partition plate. DETAILED DESCRIPTION

[0042] The technical solutions of the present application will be further described below in combination 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 description, only the parts related to the present application are shown in the drawings, not all.

[0043] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, 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.

[0044] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] In the process of generator working, in order to realize the polarity conversion between the positive current collecting ring and the negative current collecting ring, achieve the purpose of balancing the wear of the positive and negative current collecting rings, prolong the service life of the current collecting ring, and improve the operation reliability of the current collecting ring and the carbon brush, as shown in the background art, the present application provides a generator current collecting ring polarity conversion structure. Figure 1 The generator current collecting ring polarity conversion structure includes an exciter assembly, a conversion assembly, a first wire 31, a second wire 41 and an excitation busbar assembly.

[0046] The exciter assembly includes a first positive busbar 1 and a first negative busbar 2; the first positive busbar 1 and the first negative busbar 2 are electrically connected with the conversion assembly; one end of the first wire 31 is electrically connected with the conversion assembly, and one end of the second wire 41 is electrically connected with the conversion assembly; the excitation busbar assembly includes a second positive busbar 5 and a second negative busbar 6, the second positive busbar 5 is electrically connected with the first wire 31, and the second negative busbar 6 is electrically connected with the second wire 41; the second positive busbar 5 can be electrically connected with the positive current collecting ring, and the second negative busbar 6 can be electrically connected with the negative current collecting ring; the conversion assembly can electrically connect the first positive busbar 1 with the second positive busbar 5, and electrically connect the first negative busbar 2 with the second negative busbar 6; or electrically connect the first positive busbar 1 with the second negative busbar 6, and electrically connect the first negative busbar 2 with the second positive busbar 5.

[0047] By adjusting the conversion assembly, the first positive busbar 1 and the second positive busbar 5 are electrically connected, the first negative busbar 2 and the second negative busbar 6 are electrically connected, the normal work between the positive current collecting ring and the negative current collecting ring is realized; or the first positive busbar 1 and the second negative busbar 6 are electrically connected, the first negative busbar 2 and the second positive busbar 5 are electrically connected, the polarity of the positive current collecting ring and the negative current collecting ring is exchanged. Thus, the polarity of the current collecting ring is quickly converted, the purpose of balancing the wear of the positive and negative current collecting rings is achieved, the service life of the current collecting ring is prolonged, and the operation reliability of the current collecting ring and the carbon brush is improved.

[0048] Further, the conversion assembly comprises a first connecting piece 3 and a second connecting piece 4 arranged at intervals, the first connecting piece 3 is electrically connected with the first positive busbar 1, the second connecting piece 4 is electrically connected with the first negative busbar 2, the first connecting piece 3 can be selectively electrically connected with the first wire 31 or the second wire 41, and the second connecting piece 4 can be connected with the first wire 31 or the second wire 41 which is not connected with the first connecting piece 3. In the embodiment, the first connecting piece 3 and the second connecting piece 4 are wires with connecting plates at both ends, and a 1000V heat shrink sleeve is sleeved on the wire to ensure the insulation level of the first connecting piece 3 and the second connecting piece 4 around. Through the above setting, only the first wire 31 and the second wire 41 corresponding to the first connecting piece 3 or the second connecting piece 4 need to be adjusted, which is simple and convenient to operate.

[0049] Further, a first axial conversion bus 11 is arranged between the first positive busbar 1 and the first connecting piece 3, one end of the first axial conversion bus 11 is electrically connected with the first positive busbar 1, and the other end of the first axial conversion bus 11 is electrically connected with the first connecting piece 3. Specifically, in the embodiment, the first axial conversion bus 11 is a wire with connecting plates at both ends, and a 1000V heat shrink sleeve is sleeved on the first axial conversion bus 11 to ensure the insulation level of the first axial conversion bus 11 around. By arranging the first axial conversion bus, the connection between the first positive busbar 1 and the first connecting piece 3 can be facilitated.

[0050] Further, the connecting plate of the first positive busbar 1 and the first axial conversion bus 11 is connected by a stainless steel bolt, and the other connecting plate of the first positive busbar 1 and one connecting plate of the first connecting piece 3 are connected by a stainless steel bolt to ensure the strength of the connection.

[0051] Further, the first negative busbar 2 and the second wiring part 4 are provided with a second axial conversion bus 21, one end of the second axial conversion bus 21 is electrically connected with the first negative busbar 2, and the other end of the second axial conversion bus 21 is electrically connected with the second wiring part 4. Specifically, in the embodiment, the second axial conversion bus 21 is a wire with a connecting plate at both ends, and a 1000V heat shrink sleeve is sleeved on the second axial conversion bus 21 to ensure the insulation level of the second axial conversion bus 21 and the surrounding environment. By arranging the second axial conversion bus, the connection between the second positive busbar 5 and the second wiring part 4 can be facilitated.

[0052] Further, the connecting plate of the second positive busbar 5 and the second axial conversion bus 21 is connected by a stainless steel bolt, and the other connecting plate of the second positive busbar 5 is connected with one connecting plate of the second wiring part 4 by a stainless steel bolt, to ensure the strength of the connection.

[0053] Further, the generator current collector ring polarity conversion structure further comprises a first isolation assembly 7, and the connection part of the first wiring part 3 and the first axial conversion bus 11 is clamped in the first isolation assembly 7. By arranging the first isolation assembly 7, the connection part of the first wiring part 3 and the first axial conversion bus 11 can be insulated and protected.

[0054] Further, the first isolation assembly 7 comprises two first insulation partitions 71 arranged at intervals, and the two first insulation partitions 71 are connected by a first insulation screw. In the embodiment, the first insulation plate and the first insulation screw are both made of epoxy glass. Through the above arrangement, the insulation performance can meet the requirements.

[0055] Further, the first insulation partition 71 is provided with a heat dissipation groove, and the heat generated at the connection part of the first wiring part 3 and the first axial conversion bus 11 can be quickly dissipated through the heat dissipation groove on the first insulation partition 71, thereby preventing the insulation performance of the first insulation partition 71 from being affected.

[0056] Further, the generator current collector ring polarity conversion structure further comprises a second isolation assembly 8, and the connection part of the second wiring part 4 and the second axial conversion bus 21 is clamped in the second isolation assembly 8. By arranging the second isolation assembly 8, the connection part of the second wiring part 4 and the second axial conversion bus 21 can be insulated and protected.

[0057] Further, the second isolation assembly 8 comprises two second insulation partitions 81 arranged at intervals, and the two second insulation partitions 81 are connected by a second insulation screw. In the embodiment, the second insulation plate and the second insulation screw are both made of epoxy glass. Through the above arrangement, the insulation performance can meet the requirements.

[0058] Further, the first insulating partition plate 71 is provided with heat dissipation grooves, and the heat generated at the connection between the first wiring member 3 and the first axial conversion busbar 11 can be quickly dissipated through the heat dissipation grooves on the first insulating partition plate 71, thereby preventing the insulation performance of the first insulating partition plate 71 from being affected.

[0059] Further, in the work site, according to the actual needs and the equipment structure characteristics of the exciter, an insulating support is arranged to support the first wiring member 3 and the second wiring member 4, so as to avoid the deformation of the first wiring member 3 and the second wiring member 4 and affect the operation.

[0060] The embodiment also provides a use method, which adjusts the polarity of the collector ring by using the above generator collector ring polarity conversion structure, and includes the following steps:

[0061] Normal polarity wiring:

[0062] The first positive busbar 1 and the first negative busbar 2 are electrically connected with the conversion assembly;

[0063] One end of the first wire 31 is electrically connected with the conversion assembly, and one end of the second wire 41 is electrically connected with the conversion assembly;

[0064] The second positive busbar 5 is electrically connected with the first wire 31, and the second negative busbar 6 is electrically connected with the second wire 41;

[0065] The conversion assembly electrically connects the first positive busbar 1 with the second positive busbar 5 and electrically connects the first negative busbar 2 with the second negative busbar 6;

[0066] The contact resistance of all connection parts should be less than 20 mu omega, and the insulation between the second positive busbar 5 and the ground, the insulation between the second negative busbar 6 and the ground, and the insulation between the second positive busbar 5 and the second negative busbar 6 should be qualified before operation;

[0067] Conversion polarity wiring:

[0068] The first positive busbar 1 and the first negative busbar 2 are electrically connected with the conversion assembly;

[0069] One end of the first wire 31 is electrically connected with the conversion assembly, and one end of the second wire 41 is electrically connected with the conversion assembly;

[0070] The second positive busbar 5 is electrically connected with the first wire 31, and the second negative busbar 6 is electrically connected with the second wire 41;

[0071] The conversion assembly electrically connects the first positive busbar 1 with the second negative busbar 6 and electrically connects the first negative busbar 2 with the second positive busbar 5;

[0072] The contact resistance of all connection points should not be greater than 20 mu omega, the insulation of the second positive busbar 5 to ground, the insulation of the second negative busbar 6 to ground, and the insulation between the second positive busbar 5 and the second negative busbar 6 is measured, and after the insulation is qualified, it can be put into operation.

[0073] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A generator slip ring polarity reversal structure, characterized in that, include: An exciter assembly, the exciter assembly including a first positive busbar (1) and a first negative busbar (2); The conversion component is electrically connected to both the first positive busbar (1) and the first negative busbar (2). A first wire (31) and a second wire (41), one end of the first wire (31) being electrically connected to the conversion component, and one end of the second wire (41) being electrically connected to the conversion component; The excitation busbar assembly includes a second positive busbar (5) and a second negative busbar (6). The second positive busbar (5) is electrically connected to the first conductor (31), and the second negative busbar (6) is electrically connected to the second conductor (41). The second positive busbar (5) can be electrically connected to the positive collector ring, and the second negative busbar (6) can be electrically connected to the negative collector ring. The conversion component enables the first positive busbar (1) to be electrically connected to the second positive busbar (5), and the first negative busbar (2) to be electrically connected to the second negative busbar (6); or the first positive busbar (1) to be electrically connected to the second negative busbar (6), and the first negative busbar (2) to be electrically connected to the second positive busbar (5). The conversion component includes a first connector (3) and a second connector (4) spaced apart. Both the first connector (3) and the second connector (4) are wires with terminals at both ends. The first connector (3) is electrically connected to the first positive busbar (1), and the second connector (4) is electrically connected to the first negative busbar (2). The first connector (3) can selectively connect to the first wire (31) or the second wire (41), and the second connector (4) can connect to the first wire (31) or the second wire (41) that is not connected to the first connector (3).

2. The generator slip ring polarity reversal structure according to claim 1, characterized in that, A first axial conversion busbar (11) is provided between the first positive busbar (1) and the first connector (3). One end of the first axial conversion busbar (11) is electrically connected to the first positive busbar (1), and the other end of the first axial conversion busbar (11) is electrically connected to the first connector (3).

3. The generator slip ring polarity reversal structure according to claim 1, characterized in that, A second axial conversion busbar (21) is provided between the first negative busbar (2) and the second connector (4). One end of the second axial conversion busbar (21) is electrically connected to the first negative busbar (2), and the other end of the second axial conversion busbar (21) is electrically connected to the second connector (4).

4. The generator slip ring polarity reversal structure according to claim 2, characterized in that, It also includes a first isolation component (7), in which the connection between the first connector (3) and the first axial conversion busbar (11) is sandwiched within the first isolation component (7).

5. The generator slip ring polarity reversal structure according to claim 4, characterized in that, The first isolation component (7) includes two spaced-apart first insulating partitions (71), which are connected by a first insulating screw.

6. The generator slip ring polarity reversal structure according to claim 5, characterized in that, The first insulating partition (71) has heat dissipation grooves.

7. The generator slip ring polarity reversal structure according to claim 3, characterized in that, It also includes a second isolation component (8), in which the connection between the second connector (4) and the second axial conversion busbar (21) is sandwiched within the second isolation component (8).

8. The generator slip ring polarity reversal structure according to claim 7, characterized in that, The second isolation assembly (8) includes two spaced-apart second insulating partitions (81), which are connected by a second insulating screw.

9. A method for adjusting the polarity of a slip ring using the generator slip ring polarity reversal structure as described in any one of claims 1-8, comprising the following steps: Normal polarity connection: Both the first positive busbar (1) and the first negative busbar (2) are electrically connected to the conversion assembly; One end of the first wire (31) is electrically connected to the conversion component, and one end of the second wire (41) is electrically connected to the conversion component; The second positive busbar (5) is electrically connected to the first wire (31), and the second negative busbar (6) is electrically connected to the second wire (41); The conversion component electrically connects the first positive busbar (1) to the second positive busbar (5) and the first negative busbar (2) to the second negative busbar (6); Measure the contact resistance of all connection parts. It should not be greater than 20μΩ. Measure the insulation between the second positive busbar (5) and ground, the insulation between the second negative busbar (6) and ground, and the insulation between the second positive busbar (5) and the second negative busbar (6). Once the insulation is qualified, it can be put into operation. Reverse polarity wiring: Both the first positive busbar (1) and the first negative busbar (2) are electrically connected to the conversion component; One end of the first wire (31) is electrically connected to the conversion component, and one end of the second wire (41) is electrically connected to the conversion component; The second positive busbar (5) is electrically connected to the first wire (31), and the second negative busbar (6) is electrically connected to the second wire (41); The conversion component electrically connects the first positive busbar (1) to the second negative busbar (6) and the first negative busbar (2) to the second positive busbar (5); Measure the contact resistance of all connection parts. It should not be greater than 20μΩ. Measure the insulation between the second positive busbar (5) and ground, the insulation between the second negative busbar (6) and ground, and the insulation between the second positive busbar (5) and the second negative busbar (6). Once the insulation is qualified, it can be put into operation.

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