Accessory equipment group on wire outlet side of generator

Abstract

The utility model provides an accessory equipment group on a generator outgoing line side, which comprises a generator outgoing line copper bar which is directly butted with a main transformer low-voltage side sleeve through a generator-transformer group enclosed bus which is arranged at a high position. The generator-transformer group enclosed bus is provided with a first enclosed bus branch which is vertically downward and is connected with accessory equipment. According to the utility model, the safety and the reliability can be ensured, the connection distance between the devices can be simplified, the length of the enclosed bus can be shortened, the shortest path of the enclosed bus main loop in butt joint with the main transformer and the shortest branch path of the enclosed bus can be achieved, and the limited space layout can be reasonably utilized, so that the device cost can be saved and the operation and maintenance space of the device can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrical technical field, especially relate to a kind of accessory equipment group of generator outlet side. BACKGROUND

[0002] Generator outlet adopts closed busbar connection to transformer or outlet circuit breaker and the like form has been widely applied in the vast power plant in our country.The layout trend of closed busbar is usually related to the position height of generator outlet copper bar, according to the needs of different generator equipment and opposite interface equipment, the layout of closed busbar also presents more and more diversified trend.Usually, after the copper bar of generator outlet, excitation transformer, PT lightning arrester cabinet and the like are needed to be connected in succession, closed busbar itself is provided with micro-positive pressure and other busbar maintenance equipment, and neutral point outlet can have neutral electric cabinet.A series of equipment are concentrated in a region of workshop, and need to be reasonably arranged in limited space, so as to achieve reasonable space utilization, safe and reliable, and save the layout mode of investment.

[0003] The utility model with prior art publication number CN202094485U provides a kind of 1000MW unit common box closed busbar's layout structure, proposes two kinds of indoor arrangement scheme of operation layer arrangement or intermediate layer arrangement to common box closed busbar, common point is, in A column, at least two groups of common box closed busbar are connected to starting / standby transformer, the common box closed busbar enters indoor through steam turbine room wall hole, is connected with at least one switch cabinet for unit respectively, switch cabinet for unit is also connected with corresponding plant transformer respectively, support point is arranged on the wall of steam turbine room A column civil engineering pillar, and common box closed busbar is arranged along the wall of A column using support point.The difference between the two is that in the intermediate layer arrangement, there is a winding workshop pillar arrangement stage, which crosses more with the process.The utility model can reduce the cross design of foundation, save building materials after indoor arrangement, greatly improve the operating environment, and reduce the probability of accidents. UTILITY MODEL CONTENT

[0004] Closed busbar is very high in cost, and a series of equipment are concentrated in a region of workshop at the outlet of generator, need to be reasonably arranged in limited space, effectively overhauled and maintained, to avoid interference and failure.Therefore, a layout structure is needed to ensure safety and reliability, simplify the connection distance between each equipment, reasonably utilize limited space layout, so as to save equipment investment and guarantee equipment operation and maintenance space.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows: an accessory equipment group of generator outlet side, including generator outlet copper bar, the generator outlet copper bar is directly connected to the low-voltage side sleeve of main transformer through the high-positioned generator-transformer group closed busbar;A first closed busbar branch connected with accessory equipment is arranged vertically downward on the generator-transformer group closed busbar.

[0006] As a further improvement of the utility model, the generator outgoing copper bar is connected with the generator-transformer closed bus through the soft conductor.

[0007] As a further improvement of the utility model, the generator outgoing copper bar, the generator-transformer closed bus and the main transformer low-voltage side bushing are arranged on the high-position layer arranged at a high position, and the generator-transformer closed bus is supported by the support and arranged in suspension on the floor of the bottom of the high-position layer.

[0008] As a further improvement of the utility model, the auxiliary equipment is arranged on the low-position layer arranged at a low position, and the first closed bus branch is vertically led down from the generator-transformer closed bus and connected with the auxiliary equipment.

[0009] As a further improvement of the utility model, the auxiliary equipment comprises a generator auxiliary lightning arrester and a PT cabinet, and the generator auxiliary lightning arrester and the PT cabinet are connected with the first closed bus branch.

[0010] As a further improvement of the utility model, the first closed bus branch is connected with the generator auxiliary lightning arrester and the PT cabinet and leads out the second closed bus branch.

[0011] As a further improvement of the utility model, the auxiliary equipment further comprises an excitation transformer, and the excitation transformer is connected with the second closed bus branch.

[0012] As a further improvement of the utility model, a floor is arranged between the high-position layer arranged at a high position and the low-position layer arranged at a low position, the first closed bus branch and the second closed bus branch are vertically led down from the generator-transformer closed bus of the high-position layer, pass through the floor and reach the low-position layer to be connected with the auxiliary equipment.

[0013] The utility model has the advantages that the connection distance between various devices can be simplified, the length of the closed bus is shortened, the shortest path of the closed bus main loop to the main transformer is achieved, the shortest path of the closed bus branch is also achieved, the limited space is reasonably utilized, the device cost is saved and the operation and maintenance space of the device is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a line schematic view of the utility model.

[0015] Figure 2 It is a side structure view of the utility model.

[0016] In the drawing, 1 is a generator-transformer closed bus, 2 is a generator auxiliary lightning arrester and a PT cabinet, 3 is an excitation transformer, 4 is a first closed bus branch, 5 is a second closed bus branch, 6 is a soft conductor, 7 is a main transformer low-voltage side bushing, 8 is a generator outgoing copper bar, and 9 is a support. DETAILED DESCRIPTION

[0017] The utility model will be described in detail below in combination with the drawings and embodiments.

[0018] Embodiment one: a complete arrangement structure of generator outlet copper bar 8, generator outlet copper bar 8 is directly docked main transformer low voltage side bushing 7 through high position arrangement's generator and transformer group closed busbar 1;Generator and transformer group closed busbar 1 is equipped with the first closed busbar branch 4 of vertical downward and is connected with accessory equipment.

[0019] The cost of closed busbar is very expensive, and a series of equipment at the generator outlet is concentrated in an area of the workshop, which needs to be reasonably arranged in limited space, effectively maintained and repaired, and interference and failure avoided. Therefore, an arrangement structure is needed to ensure safety and reliability, simplify the connection distance between each device, reasonably utilize the limited space layout, thereby saving equipment investment and ensuring the operation and maintenance space of the equipment.

[0020] Generator outlet copper bar 8 is transitionally connected with generator and transformer group closed busbar 1 through flexible wire 6. Generator outlet copper bar 8, generator and transformer group closed busbar 1 and main transformer low voltage side bushing 7 are arranged on a high position layer arranged at a high position, accessory equipment is arranged on a low position layer arranged at a low position, and the first closed busbar branch 4 is vertically led down from the generator and transformer group closed busbar 1 and connected with accessory equipment. The generator and transformer group closed busbar is supported by a support 9 and arranged in suspension with the bottom floor of the high position layer. Generator outlet copper bar 8, generator and transformer group closed busbar 1 and main transformer low voltage side bushing 7 and accessory equipment are arranged separately, sufficient space is reserved, maintenance and repair are facilitated, and mutual interference between each device during maintenance is avoided.

[0021] The accessory equipment includes a generator accessory arrester and a PT cabinet 2, and the generator accessory arrester and the PT cabinet 2 are connected with the first closed busbar branch 4. The first closed busbar branch 4 is connected with the generator accessory arrester and the PT cabinet 2 and leads out a second closed busbar branch 5. The accessory equipment further includes an excitation transformer 3, and the excitation transformer 3 is connected with the second closed busbar branch 5. The generator copper bar outlet is a downward outlet, the generator and transformer group closed busbar 1 and the closed busbar branch have the shortest path, the generator and transformer group closed busbar 1 and the generator accessory arrester and the PT cabinet 2 and the excitation transformer 3 are arranged in an upper and lower manner, the limited space layout is reasonably utilized, the device arrangement is more compact, hierarchical maintenance is realized, and space waste is avoided.

[0022] The floor is arranged between the high-position layer and the low-position layer, and separates the generator-transformer group closed bus 1 and the auxiliary equipment, prevents electromagnetic interference between the generator-transformer group closed bus 1 and the auxiliary equipment, and avoids mutual interference and loss expansion in case of accident. The first closed bus branch 4 and the second closed bus branch 5 are vertically led from the generator-transformer group closed bus 1 on the high-position layer, pass through the floor, and reach the low-position layer to be connected with the auxiliary equipment. The generator-transformer group closed bus 1 is supported by the support 9 and is arranged in suspension on the floor of the high-position layer. The support 9 separates the generator-transformer group closed bus 1 from the floor, reduces damage in case of accident, and facilitates maintenance of the generator-transformer group closed bus 1. The closed bus branch is vertically led, the generator auxiliary lightning arrester and the PT cabinet 2 and the excitation transformer 3 are arranged in the zero-meter layer, the main loop of the generator-transformer group closed bus 1 is connected to the main transformer path, and the closed bus branch path is the shortest.

[0023] After the generator-transformer group closed bus 1 main loop is arranged in high position and the generator auxiliary lightning arrester and the PT cabinet 2 and the excitation transformer 3 are arranged in low position, the generator-transformer group closed bus 1 main loop has more maintenance space in the middle layer, so that the micro-positive-pressure auxiliary maintenance equipment has sufficient storage space. The branch bus is vertically led to connect the generator auxiliary lightning arrester and the PT cabinet 2 and the excitation transformer 3, so that the branch distance is the shortest. Meanwhile, the two belong to different high and low position spaces, reducing the mutual influence of the closed bus and the closed bus branch maintenance, thereby saving investment and improving the operation safety of the existing equipment.

[0024] The embodiment is only one aspect in the application process of the utility model, and the utility model is not limited to the above examples, but can be widely applied to closed bus arrangement of various industrial projects, such as municipal, petroleum and chemical engineering and the like. All the modifications directly derived or thought from the content disclosed by the utility model can be considered as the protection scope of the utility model.

[0025] Embodiment two: a complete arrangement structure of a generator-transformer group closed bus 1 and auxiliary equipment, a soft wire 6 is used at a generator outgoing copper bar 8 to transit to the generator-transformer group closed bus 1, the generator-transformer group closed bus 1 is arranged on a high-position layer, directly connects a main transformer low-voltage side bushing 7, a generator auxiliary lightning arrester and a PT cabinet 2, and an excitation transformer 3 are arranged in a low-position layer. The first closed bus branch 4 vertically passes through a floor to be connected to the generator auxiliary lightning arrester and the PT cabinet 2, and the second closed bus branch 5 is connected to the excitation transformer 3 high-voltage side in the low-position layer.

[0026] The cost of the closed busbar is very expensive, and a series of devices at the generator outlet are concentrated in an area of the plant house, which needs to be reasonably arranged in limited space, effectively maintained, and interference and failure avoided. Therefore, an arrangement structure is needed to ensure safety and reliability, simplify the connection distance between devices, reasonably use the limited space layout, thereby saving device investment and ensuring the operation and maintenance space of the device.

[0027] The generator outlet copper bar 8 is connected to the generator transformer group closed busbar 1 through a soft conductor 6. The generator outlet copper bar 8, the generator transformer group closed busbar 1 and the main transformer low-voltage side bushing 7 are arranged on a high-level layer, and the auxiliary equipment is arranged on a low-level layer. In this embodiment, the high-level layer is a 3.9-meter layer at a height of 3.9 meters, and the low-level layer is a 0-meter layer; the first closed busbar branch 4 is vertically connected from the generator transformer group closed busbar 1 on the 3.9-meter layer to the auxiliary equipment. The generator outlet copper bar 8, the generator transformer group closed busbar 1 and the main transformer low-voltage side bushing 7 and the auxiliary equipment are arranged separately, leaving enough space for maintenance and avoiding interference between devices during maintenance.

[0028] At the high level of the 3.9-meter layer, the generator outlet copper bar 8 is connected to the generator transformer group closed busbar 1 through a soft conductor 6, and the generator transformer group closed busbar 1 is directly connected to the main transformer low-voltage side bushing 7.

[0029] At the low level of the 0-meter layer, the generator auxiliary surge arrester and the PT cabinet 2 and the excitation transformer 3 are arranged. The generator auxiliary surge arrester is an important safety device in the power system, and its main function is to protect the generator from lightning overvoltage and operating overvoltage. The surge arrester is usually installed at the outlet end of the generator or the busbar, and limits the voltage amplitude by absorbing overvoltage energy, thereby protecting the generator insulation from damage. Common generator surge arresters include zinc oxide surge arresters, silicon carbide surge arresters, etc., among which zinc oxide surge arresters are widely used due to their excellent voltage-current characteristics and nonlinear resistance characteristics.

[0030] The PT cabinet (voltage transformer cabinet) is another important device in the power system, and its main function is to provide measurement voltage, instrument voltage and protection voltage in the electrical system. The PT cabinet usually has voltage transformers (PT), fuses, surge arresters and other elements installed.

[0031] Voltage transformer: converts high voltage to low voltage in proportion to adapt to the voltage requirements of instruments. At the same time, the voltage transformer can also provide measurement voltage and protection voltage in the electrical system.

[0032] Fuse: provides protection for the voltage transformer, and can quickly cut off the circuit when the voltage transformer fails to prevent the failure from spreading.

[0033] Lightning arrester: mainly plays the role of overvoltage and lightning protection, ensures the safe operation of PT cabinet and the entire electrical system.

[0034] The overall structure of PT cabinet usually adopts a detachable metal armored structure, and a large observation port is provided on the equipment panel to observe the operation of the PT cabinet at any time. In addition, the PT cabinet can also be configured with different types and quantities of PT according to the specific design parameters of the project to meet the different needs of the electrical system.

[0035] In terms of function, PT cabinet not only provides measurement voltage and protection voltage, but also provides operation and control power for related equipment, and meets the needs of electrical system relay protection. For example, busbar insulation, under-voltage, over-voltage, standby device self-throwing conditions, etc. all require PT cabinet to provide necessary voltage signals and protection functions.

[0036] Generator auxiliary lightning arrester and PT cabinet are indispensable equipment in power system. Lightning arrester protects generator from damage by absorbing overvoltage energy, while PT cabinet provides measurement voltage, protection voltage and operation and control power in electrical system. Both of them work together to ensure the safe and stable operation of power system.

[0037] The auxiliary equipment of the embodiment includes a generator auxiliary lightning arrester and a PT cabinet 2, and the generator auxiliary lightning arrester and the PT cabinet 2 are connected with a first closed busbar branch 4. The first closed busbar branch 4 is connected with the generator auxiliary lightning arrester and the PT cabinet 2, and then a second closed busbar branch 5 is led out. The auxiliary equipment also includes an excitation transformer 3, which is connected with the second closed busbar branch 5. The excitation transformer 3 is a device specially designed to provide three-phase AC excitation power for the generator excitation system. The excitation transformer 3 converts three-phase power into generator rotor DC power through thyristors, forming a generator excitation magnetic field. By adjusting the trigger angle of the excitation system thyristor, the purpose of adjusting the motor terminal voltage and reactive power can be achieved. It is mainly applied in power plants to adjust the magnetic field strength of the generator to ensure the normal operation of the generator. At the same time, it can also provide stable current and voltage to effectively protect the generator from power fluctuations. In addition, the excitation transformer 3 is also widely used in industrial production such as electric welding and electric cutting, as well as generator magnetic field adjustment and automatic control equipment on ships. When using the excitation transformer 3, regular maintenance and maintenance are needed to ensure its normal operation and prolong its service life. This includes checking the insulation of the winding, cleaning the surface of the transformer, checking the operation of the cooling device, etc. Therefore, it is necessary to reasonably utilize the limited space layout to ensure the operation and maintenance space of the excitation transformer 3 and other equipment.

[0038] The generator copper outgoing line is a downward outgoing line, the enclosed busbar 1 and the enclosed busbar branch path of the generator-transformer unit are the shortest, the generator-transformer unit enclosed busbar 1 and the generator auxiliary lightning arrester and PT cabinet 2 and the excitation transformer 3 are arranged in an up-down mode, the limited space is reasonably utilized, the equipment arrangement is more compact, the hierarchical maintenance is realized, and the space waste is avoided.

[0039] The first enclosed busbar branch 41 is directly connected to the generator auxiliary lightning arrester and PT cabinet 2 through the floor and then connected to the high-voltage side of the excitation transformer 3 through the second enclosed busbar branch 5.

[0040] The floor is arranged between the 3.9-meter layer arranged at a high position and the 0-meter layer arranged at a low position, the first enclosed busbar branch 4 and the second enclosed busbar branch 5 are vertically led down from the generator-transformer unit enclosed busbar 1 of the 3.9-meter layer, pass through the floor, and reach the 0-meter layer to be connected to the auxiliary equipment. The enclosed busbar branch is vertically led down, the generator auxiliary lightning arrester and PT cabinet 2 and the excitation transformer 3 are arranged at the 0-meter layer, the main loop of the generator-transformer unit enclosed busbar 1 is connected to the main transformer path, the shortest path is achieved, and the enclosed busbar branch path is also the shortest.

[0041] The above specific embodiments are only the preferred embodiments of the utility model, and the specific implementation structure and implementation range of the utility model are not limited by this. In fact, some equivalent changes can be made according to the shape, structure and design purpose of the utility model. Therefore, any equivalent changes made according to the shape, structure and design purpose of the utility model should be included in the protection range of the utility model, that is, these equivalent changes should be protected by the utility model.

Claims

1. An auxiliary equipment group on the outgoing side of a generator, characterized in that The generator outgoing copper bar is directly connected to the low-voltage side bushing of the main transformer through the high-position arranged generator-transformer group closed bus; the first closed bus branch is arranged on the generator-transformer group closed bus and is connected to the auxiliary equipment.

2. The generator outlet side auxiliary equipment group according to claim 1, characterized by The generator outgoing copper bar is connected to the generator-transformer group closed bus through a soft wire.

3. The generator outlet side auxiliary device group according to claim 1, characterized by, The generator outgoing copper bar, the generator-transformer group closed bus and the low-voltage side bushing of the main transformer are arranged on the high-position arranged high-position layer, and the generator-transformer group closed bus is supported by a support and is arranged in suspension with the bottom floor of the high-position layer.

4. The generator outlet-side auxiliary device group according to claim 1, characterized by The auxiliary equipment is arranged on the low-position arranged low-position layer, and the first closed bus branch is vertically led down from the generator-transformer group closed bus and is connected to the auxiliary equipment.

5. The generator outlet side auxiliary equipment group according to claim 1 or 4, characterized by The auxiliary equipment includes a generator auxiliary lightning arrester and a PT cabinet, and the generator auxiliary lightning arrester and the PT cabinet are connected to the first closed bus branch.

6. The generator outlet-side accessory group according to claim 1, characterized by The first closed bus branch is connected to the generator auxiliary lightning arrester and the PT cabinet and leads out a second closed bus branch.

7. The group of auxiliary equipment on the generator outlet side according to claim 1 or 4, characterized by, The auxiliary equipment further includes an excitation transformer, and the excitation transformer is connected to the second closed bus branch.

8. The generator outlet side auxiliary device group according to claim 3 or 4, characterized by The high-position layer and the low-position layer are separated by a floor, the first closed bus branch and the second closed bus branch are vertically led down from the generator-transformer group closed bus of the high-position layer, pass through the floor and reach the low-position layer to be connected to the auxiliary equipment.

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