A voltage transformer for a ring main unit

Abstract

The present invention relates to a voltage transformer for a ring main unit. When adjusting the voltage transformer body in the vertical direction, for a large-distance adjustment, the third mounting hole can be installed corresponding to the fourth mounting holes at different positions; for a small-distance adjustment, the fourth mounting hole can be aligned with different heights of the waist-shaped third mounting hole; or the above two methods can be combined to accurately adjust the vertical installation parameters of the voltage transformer body. When adjusting the voltage transformer body in the left-right direction, for the moving stroke of the voltage transformer body being an integer multiple of the length of the positioning teeth, only some elastic adjusting bolts need to be adjusted; for the stroke being less than one time the length of the positioning teeth, only the active adjusting bolt and the driven adjusting bolt need to be adjusted; for the stroke being less than one time the length of the positioning teeth and not being an integer multiple, some elastic adjusting bolts, the active adjusting bolt and the driven adjusting bolt need to be adjusted jointly.

Description

Technical Field

[0001] The present invention belongs to the technical field of voltage transformers, and specifically relates to a voltage transformer for a ring main unit (RMU). Background Art

[0002] Nowadays, with the expansion of the scale of electric power energy use, the usage of RMUs in China has increased sharply. Ensuring the safe and stable operation of RMUs is a necessary condition for guaranteeing the safe operation of the distribution network system. A high-voltage voltage transformer is an important and indispensable measuring device in the power system, which realizes the electrical isolation between the primary and secondary systems. On the one hand, when the power system is operating normally, the voltage transformer transforms the high voltage on the primary side into a low voltage suitable for the operation of measuring instruments and metering devices, etc.; on the other hand, when a fault occurs in the power system, the voltage transformer can correctly reflect the voltage waveform under the fault state, cooperate with relay protection and automatic devices, and constitute protection and automatic control for various faults in the power system.

[0003] Currently, the voltage transformer inside the RMU is generally installed on the bottom plate at the bottom, or hung on the side plate or support skeleton of the RMU. For the hanging type voltage transformer, the transformer main body is fixedly installed on the mounting seat through fasteners such as bolts. During the entire installation process, it is necessary to manually hold the transformer main body, especially during the process of assembling each bolt, which is time-consuming and laborious; moreover, the installation position of the transformer main body cannot be conveniently adjusted.

[0004] Therefore, there is an urgent need for a voltage transformer for an RMU that can solve the above problems. Summary of the Invention

[0005] In order to solve the above problems, the present invention proposes a voltage transformer for an RMU, which includes an RMU and a voltage transformer installed inside the RMU;

[0006] The RMU includes a main body skeleton, which is composed of several transverse skeletons and longitudinal skeletons;

[0007] The voltage transformer includes a transformer main body and a transformer mounting seat assembly. There are a pair of transformer mounting seat assemblies, which are arranged vertically. Both of the two transformer mounting seat assemblies are detachably installed on a pair of adjacent longitudinal skeletons;

[0008] The transformer mounting seat assembly includes a mounting seat and a connecting component installed on the mounting seat. The mounting seat is detachably installed on a pair of adjacent longitudinal skeletons, and the transformer main body is detachably installed on the connecting component through its base;

[0009] The connecting component includes a track fixedly installed on the upper end surface of the mounting seat, and a track groove in the shape of a "convex" character is provided in the track; a slider is fixedly installed on the lower end surface of the base, and the shape and size of the slider are the same as those of the track groove;

[0010] Among them, the connecting component further includes a number of positioning teeth arranged on the upper end surface of the mounting base. A mating tooth is fixedly installed on the lower end surface of the base, and the shape and size of the mating tooth match those of the positioning teeth;

[0011] The positioning teeth are configured to be elastically stretchable and extend out of the upper end surface of the mounting base or retract into the upper end surface of the mounting base. When the main body of the mutual inductor is installed, some of the positioning teeth are in the first elastic state, and the rest of the positioning teeth are in the second elastic state; when the main body of the mutual inductor is disassembled, all of the positioning teeth are in the third elastic state;

[0012] Among them, the positioning teeth are triangular teeth, including a small inclined surface and a large inclined surface, and the inclination angle of the small inclined surface is smaller than that of the large inclined surface; and when the main body of the mutual inductor is installed, the small inclined surface is the stress surface; when the main body of the mutual inductor is disassembled, the large inclined surface is the stress surface;

[0013] Among them, the stiffness of the positioning teeth in the third elastic state is less than that of the positioning teeth in the first elastic state, and the stiffness of the positioning teeth in the first elastic state is less than that of the positioning teeth in the second elastic state.

[0014] Furthermore:

[0015] The ring main unit further includes a cabinet door and a control panel located in the front, side plates located on both sides, a rear vertical plate located at the rear, a top plate located above, and a bottom plate located below;

[0016] First mounting holes are arranged in an array on both the transverse skeleton and the longitudinal skeleton. The cabinet door, the control panel, the side plates, the rear vertical plate, the top plate, and the bottom plate are also provided with second mounting holes in an array, so as to install them on the main body skeleton through bolt assemblies.

[0017] Furthermore:

[0018] Connecting plates are arranged at both ends of the mounting base, and a number of third mounting holes are arranged in an array on the connecting plates. A number of fourth mounting holes are also arranged in an array on the longitudinal skeleton, and are tightly connected by bolt assemblies passing through the third mounting holes and the fourth mounting holes;

[0019] Among them, the number of the fourth mounting holes is more than that of the third mounting holes, and the third mounting holes are waist-shaped holes.

[0020] Furthermore:

[0021] An installation groove is further opened on the upper end surface of the mounting base. A tooth seat is installed in the installation groove. A number of positioning teeth are elastically stretchably installed in the tooth seat, and a receiving groove is opened on the upper end surface of the tooth seat. A stepped hole is opened in the receiving groove, and the number thereof is the same as that of the positioning teeth;

[0022] Among them, the large hole in the stepped hole is located above, and the small hole is located below; the positioning tooth includes a tooth body and a guide post, the guide post is arranged in the large hole, and its size matches that of the large hole; a first spring is also arranged in the large hole, and its upper end abuts against the lower section of the guide post, so that the positioning tooth can elastically expand and contract.

[0023] Furthermore:

[0024] The small hole is a threaded hole and penetrates through the bottom of the tooth seat. An elastic adjusting bolt is arranged in the small hole; an elastic adjusting block is also arranged in the large hole, and the lower end of the first spring abuts against the upper end surface of the elastic adjusting block;

[0025] A plurality of first through holes are also opened at the bottom of the installation groove, so that the elastic adjusting bolt can penetrate through the bottom of the installation seat and enter the small hole;

[0026] Moreover, a plurality of second through holes are opened on the side plate, so that the elastic adjusting bolt can penetrate through the second through holes and the first through holes in sequence and enter the small hole.

[0027] Furthermore:

[0028] Guide convex strips are arranged on the inner side wall of the installation groove, and a sliding through groove is opened on the outer side wall of the tooth seat, and the shape and size of the sliding through groove match those of the guide convex strips;

[0029] Among them, an active adjusting component is arranged on one side of the tooth seat, and a driven adjusting component is arranged on the other side. The active adjusting component can quantitatively adjust the distance of the left-right sliding of the tooth seat, and moreover, the active adjusting component and the driven adjusting component respectively limit the tooth seat on the left and right sides.

[0030] Furthermore:

[0031] Wedge-shaped extrusion blocks are respectively arranged at the left and right ends of the tooth seat. The active adjusting component includes a wedge-shaped active top block and an active adjusting bolt. The shape and size of the wedge-shaped active top block match those of the wedge-shaped extrusion block. An active guide groove is also opened at the bottom of the installation groove. The wedge-shaped active top block is slidably located in the active guide groove. A first threaded hole is also arranged at the bottom of the active guide groove. The active adjusting bolt is threadedly connected to the first threaded hole, and the active adjusting bolt abuts against the lower end surface of the wedge-shaped active top block;

[0032] The driven adjusting component includes a wedge-shaped driven top block and a driven adjusting bolt. The shape and size of the wedge-shaped driven top block match those of the wedge-shaped extrusion block. A driven guide groove is also opened at the bottom of the installation groove. The wedge-shaped driven top block is slidably located in the driven guide groove. A second threaded hole is also arranged at the bottom of the driven guide groove. The driven adjusting bolt is threadedly connected to the second threaded hole, and the driven adjusting bolt abuts against the lower end surface of the wedge-shaped driven top block.

[0033] Furthermore:

[0034] The side plate is also provided with an active adjustment hole and a driven adjustment hole, so that the active adjustment bolt and the driven adjustment bolt sequentially penetrate through the active adjustment hole and the driven adjustment hole and enter the first threaded hole and the second threaded hole respectively;

[0035] Wherein, the size of the first through hole on the mounting seat is larger than the small hole, and the size of the second through hole on the side plate is also larger than the small hole

[0036] Furthermore:

[0037] The wedge-shaped driven top block includes a top block body and a driving connection block. A connection groove is formed at the bottom of the top block body. The driving connection block is slidably arranged inside the connection groove, and the driven adjustment bolt abuts against the lower end surface of the driving connection block;

[0038] Wherein, a ball sliding groove is formed on the side surface of the driving connection block. A ball is slidably arranged in the ball sliding groove. A second spring is also arranged in the ball sliding groove. One end of the second spring abuts against the bottom surface of the ball sliding groove, and the other end abuts against the lower end surface of the ball. A plurality of vertically arranged engagement pits are formed on the inner wall of the connection groove, and the shape and size of the engagement pits match those of the ball.

[0039] Furthermore:

[0040] The height h that the active adjustment bolt needs to change is:

[0041]

[0042] h is the height that the active adjustment bolt needs to change, L is the stroke of the main body of the mutual inductor moving, n is a positive integer, d is the length of the positioning tooth, and α is the angle of the acute angle in the cross section of the wedge-shaped extrusion block.

[0043] The advantages of the present invention are as follows:

[0044] 1. Through the conversion between the three elastic states of the positioning teeth, and in combination with the settings of the small inclined surface and the large inclined surface of the positioning teeth, the installation process of the main body of the mutual inductor is time-saving and labor-saving. It can automatically stop when reaching the designated installation position, and the stop position is accurate; moreover, after the main body of the mutual inductor is in the installation position, it cannot retreat, further ensuring the stability of the installation of the main body of the mutual inductor; when disassembling the main body of the mutual inductor, all the positioning teeth can be adjusted to the third elastic state, and the disassembly is convenient and time-saving and labor-saving.

[0045] 2. When adjusting in the vertical direction, for a large-distance adjustment, the third installation hole can be made to correspond to the fourth installation holes at different positions for installation; for a small-distance adjustment, the fourth installation hole can be aligned with different heights of the kidney-shaped third installation hole; or the above two methods can be combined to accurately adjust the vertical installation parameters of the main body of the mutual inductor.

[0046] 3. The main body of the mutual inductor is installed on the mounting base by sliding, without the need for external force to continuously drag the main body of the mutual inductor, which saves time and effort. Moreover, when the main body of the mutual inductor reaches the designated installation position, it will automatically stop, further saving time and effort and making the installation position more accurate. By adjusting the elastic state of the positioning teeth at different positions, the adjustability of the installation position in the left-right direction is achieved.

[0047] 4. When adjusting the left-right direction of the main body of the mutual inductor 0, for the moving stroke of the main body of the mutual inductor being an integer multiple of the length of the positioning teeth, only some elastic adjusting bolts need to be adjusted; for the stroke less than one times the length of the positioning teeth, only the active adjusting bolt and the driven adjusting bolt need to be adjusted; for the stroke less than one times the length of the positioning teeth and not being an integer multiple, it is necessary to jointly adjust some elastic adjusting bolts, the active adjusting bolt and the driven adjusting bolt to improve the accuracy of adjusting the left-right direction of the main body of the mutual inductor in all directions.

[0048] 5. To avoid the negative impacts brought by relying on human perception to determine whether the tightening degree of the driven adjusting bolt is in place, the extrusion degree of the wedge-shaped driven top block on the tooth seat only relates to the elastic coefficient of the second spring.

[0049] 6. Through the formula for the height change of the active adjusting bolt, the height that the active adjusting bolt needs to move upward or downward can be quickly and accurately calculated. With the scale set on the active adjusting bolt, it is more conducive to conveniently adjusting the height position of the active adjusting bolt.

[0050] 7. The elastic adjusting bolt, the active adjusting bolt and the driven adjusting bolt all extend out of the external of the ring main unit through the through holes on the side plate, which is convenient for adjusting the elastic state of each positioning tooth and the position of the tooth seat from the outside of the ring main unit. Description of the Drawings

[0051] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0052] Figure 1 is the external structure diagram of the ring main unit;

[0053] Figure 2 is Figure 1 the partial enlarged view at A in

[0054] Figure 3 is the structure diagram of the side plate;

[0055] Figure 4 is the partial perspective view of the ring main unit;

[0056] Figure 5 isFigure 4 Partial enlarged view at position B in

[0057] Figure 6 Assembly structure diagram of voltage transformer;;

[0058] Figure 7 is Figure 6 Partial enlarged view at position C in

[0059] Figure 8 Exploded view of transformer mounting base assembly and voltage transformer;

[0060] Figure 9 is Figure 8 Partial enlarged view at position D in

[0061] Figure 10 Structure diagram of transformer mounting base assembly;

[0062] Figure 11 Structure diagram of voltage transformer;

[0063] Figure 12 Exploded view of transformer mounting base assembly;

[0064] Figure 13 Cross-sectional view of transformer mounting base assembly;

[0065] Figure 14 is Figure 13 Partial enlarged view at position E in

[0066] Figure 15 is Figure 13 Partial enlarged view at position F in

[0067] Figure 16 is Figure 13 Partial enlarged view at position G in

[0068] Figure 17 is Figure 16 Partial enlarged view at position H in

[0069] Figure 18 Exploded view of driven adjustment assembly;

[0070] Figure 19 Structure diagram of active adjustment bolt;

[0071] In the figure, there are a ring main unit cabinet 100, a main body framework 110, a longitudinal framework 120, a first mounting hole 121, a fourth mounting hole 122, a cabinet door 130, a control panel 140, a side plate 150, a second mounting hole 151, a second through hole 152, an active adjustment hole 153, a driven adjustment hole 154, a rear vertical plate 160, a heat dissipation hole 161, a top plate 170, a voltage transformer 200, a transformer main body 210, a base 211, a slider 212, a mating tooth 213, a transformer mounting seat assembly 220, a mounting seat 230, a connecting plate 231, a third mounting hole 232, a mounting groove 233, a first through hole 234, a guiding rib 235, an active guiding groove 236, a first threaded hole 237, a driven guiding groove 238, a second threaded hole 239, a connecting component 240, a track 241, a track groove 242, a positioning tooth 243, a small inclined surface 2431, a large inclined surface 2432, a tooth body 2433, a guiding column 2434, a tooth seat 250, a receiving groove 251, a stepped hole 252, a large hole 253, a small hole 254, a first spring 255, an elastic adjustment bolt 256, an elastic adjustment block 257, a sliding through groove 258, a wedge-shaped extrusion block 259, an active adjustment component 260, a wedge-shaped active top block 261, an active adjustment bolt 262, a scale groove 2621, a scale 2622, a driven adjustment component 270, a wedge-shaped driven top block 271, a driven adjustment bolt 272, a top block body 273, a driving connection block 274, a connection groove 275, a ball 276, an engagement pit 277, a ball sliding groove 278, and a second spring 279. Detailed implementation mode

[0072] In order to make the purpose, technical solutions and advantages of the present application clearer and more understandable, the present application will be described and explained below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0073] As Figure 1-19 shown, this implementation mode provides a voltage transformer for a ring main unit cabinet, which includes a ring main unit cabinet 100 and a voltage transformer 200 installed inside the ring main unit cabinet 100. The ring main unit cabinet 100 includes a main body framework 110, and the main body framework 110 is composed of several transverse frameworks (not shown) and a longitudinal framework 120. Specifically, in this implementation mode, there are eight transverse frameworks, four of which are located at the bottom and form a rectangle, and the other four are located at the top and form a rectangle. There are four longitudinal frameworks 120, which are located at the four corners of the rectangle. The upper end of the longitudinal framework 120 is fixedly connected to the corner of the rectangle at the top, and the lower end is fixedly connected to the corner of the rectangle at the bottom.

[0074] The ring main unit 100 further includes a cabinet door 130 and a control panel 140 located in the front, side plates 150 located on both sides, a rear vertical plate 160 located at the rear, a top plate 170 located above, and a bottom plate (not shown) located below. The cabinet door 130, the control panel 140, the side plates 150, the rear vertical plate 160, the top plate 170, and the bottom plate together form an internal installation space of the ring main unit 100, and the voltage transformer 200 is installed inside the ring main unit 100. Heat dissipation holes 161 are provided on the rear vertical plate 160 to facilitate ventilation and heat dissipation of the devices inside the ring main unit 100.

[0075] It should be noted that first mounting holes 121 are arranged in an array on both the transverse skeleton and the longitudinal skeleton 120. Correspondingly, second mounting holes 151 are also arranged in an array on the cabinet door 130, the control panel 140, the side plates 150, the rear vertical plate 160, the top plate 170, and the bottom plate, so as to install them on the main body skeleton 110 through bolt assemblies.

[0076] It can be understood that in the traditional ring main unit 100, the voltage transformer 200 inside is generally installed on the bottom plate located at the bottom or hung on the side plate of the ring main unit 100. In the ring main unit 100 shown in this embodiment, the voltage transformer 200 is hung at the side plate 150 of the ring main unit 100 through its mounting structure, but this does not mean a limitation on the installation position of the voltage transformer 200. The voltage transformer 200 in this embodiment can also be installed on the bottom plate through its mounting structure.

[0077] In this embodiment, the voltage transformer 200 includes a transformer main body 210 and a transformer mounting seat assembly 220. The transformer main body 210 is installed inside the ring main unit 100 through the transformer mounting seat assembly 220. There are a pair of transformer mounting seat assemblies 220, which are arranged vertically. Both of the two transformer mounting seat assemblies 220 are detachably installed on a pair of adjacent longitudinal skeletons 120; the transformer main body 210 includes a base 211 at its bottom, and the transformer main body 210 is detachably installed on a pair of transformer mounting seat assemblies 220 through its base 211.

[0078] Specifically, the transformer mounting seat assembly 220 includes a mounting seat 230 and a connection assembly 240 installed on the mounting seat 230. The mounting seat 230 is detachably installed on a pair of adjacent longitudinal skeletons 120, and the transformer main body 210 is detachably installed on the connection assembly 240 through its base 211. Connecting plates 231 are provided at both ends of the mounting seat 230, and a number of third mounting holes 232 are arranged in an array on the connecting plates 231. A number of fourth mounting holes 122 are also arranged in an array on the longitudinal skeleton 120. By passing a bolt assembly through the third mounting holes 232 and the fourth mounting holes 122 and tightening the connection, the fixed connection between the connecting plate 231 and the longitudinal skeleton 120 is realized.

[0079] Among them, the number of the fourth mounting holes 122 is more than that of the third mounting holes 232, so as to adjust the fourth mounting holes 122 corresponding to the third mounting holes 232 according to the main transformer bodies 210 of different sizes, thereby changing the distance between a pair of transformer mounting seat assemblies 220 to adapt to the main transformer bodies 210 of different longitudinal sizes; and, the third mounting holes 232 are waist-shaped holes, so as to adjust the coincidence position between the third mounting holes 232 and the fourth mounting holes 122 according to the main transformer bodies 210 of different sizes, thereby finely adjusting the distance between a pair of transformer mounting seat assemblies 220 to adapt to the main transformer bodies 210 of different longitudinal sizes.

[0080] When adjusting in the vertical direction, for a large adjustment of the distance, the third mounting holes 232 can be installed corresponding to the fourth mounting holes 122 at different positions; for a small adjustment of the distance, the fourth mounting holes 122 can be aligned with different heights of the waist-shaped third mounting holes 232; or the above two methods can be combined to accurately adjust the vertical mounting parameters of the main transformer body 210.

[0081] It can be understood that the first mounting holes 121 and the fourth mounting holes 122 are located on two mutually remote surfaces of the longitudinal skeleton 120. The first mounting holes 121 are located on the outer side surface and are used for mounting the side plate 150 outside the skeleton, and the fourth mounting holes 122 are located on the inner side surface and are used for mounting the voltage transformer 200 inside the skeleton.

[0082] Preferably, the fourth mounting holes 122 can be arranged in two rows. Correspondingly, the third mounting holes 232 can also be arranged in two rows to increase the connection strength.

[0083] It can be understood that when the traditional main transformer body 210 is hung and installed, the main transformer body 210 is fixedly installed on the mounting seat 230 through bolts. During the whole installation process, it is necessary to manually hold the main transformer body 210. Especially during the process of assembling each bolt, it is time-consuming and laborious; and, the installation position of the main transformer body 210 cannot be conveniently adjusted.

[0084] In this embodiment, the connection component 240 includes a track 241 fixedly installed on the upper end surface of the mounting seat 230, and a track groove 242 in a "convex" shape is formed in the track 241; correspondingly, a slider 212 is fixedly installed on the lower end surface of the base 211, and the shape and size of the slider 212 are the same as those of the track groove 242.

[0085] Thus, during the installation process of the mutual inductor main body 210, it is only necessary to align the slider 212 of the mutual inductor main body 210 with the "convex"-shaped track groove 242, and then push the mutual inductor main body 210 from one side to achieve the preliminary installation of the mutual inductor main body 210 and the mounting base 230. It is not necessary to rely on manual support of the mutual inductor main body 210 throughout the installation process, saving time and effort. At the same time, the setting of the "convex"-shaped track groove 242 restricts the degrees of freedom of the mutual inductor main body 210 in the up, down, front, and rear directions.

[0086] In this embodiment, the connection component 240 further includes a plurality of positioning teeth 243 provided on the upper end surface of the mounting base 230, and a mating tooth 213 is fixedly installed on the lower end surface of the base 211, and the shape and size of the mating tooth 213 match those of the positioning teeth 243; the positioning teeth 243 are configured to be elastically extendable and retractable out of or retracted into the upper end surface of the mounting base 230.

[0087] Among them, when the mutual inductor main body 210 is installed, some of the plurality of positioning teeth 243 are in the first elastic state, and the remaining part of the plurality of positioning teeth 243 is in the second elastic state; when the mutual inductor main body 210 is disassembled, all of the plurality of positioning teeth 243 are in the third elastic state.

[0088] Therefore, during installation, under the combined action of the track groove 242 and the slider 212, when the mutual inductor main body 210 is pushed from left to right ( Figure 6 viewing angle), some of the positioning teeth 243 in the first elastic state are retracted into the upper end surface of the mounting base 230 under the extrusion of the mating tooth 213, and the mutual inductor main body 210 can slide from left to right; when the mating tooth 213 at the rightmost side of the mutual inductor main body 210 contacts the positioning teeth 243 in the second elastic state, since the stiffness of the positioning teeth 243 in the second elastic state is greater than that of the positioning teeth 243 in the first elastic state, it is more difficult for the positioning teeth 243 in the second elastic state to retract into the upper end surface of the mounting base 230. Thus, when the mutual inductor main body 210 slides to this position, it can no longer slide, or in other words, the thrust that needs to be applied to the mutual inductor main body 210 increases. At this time, the pushing of the mutual inductor main body 210 is stopped.

[0089] Through the above settings, the mutual inductor main body 210 is installed on the mounting base 230 by sliding, without the need for external force to continuously support the mutual inductor main body 210, saving time and effort; moreover, when the mutual inductor main body 210 reaches the designated installation position, it will automatically stop, further saving time and effort and making the installation position more accurate. By adjusting the elastic states of the positioning teeth 243 at different positions, the adjustability of the installation position in the left-right direction is achieved.

[0090] Specifically, the positioning tooth 243 is a triangular tooth, including a small inclined surface 2431 and a large inclined surface 2432. The inclination angle of the small inclined surface 2431 is smaller than that of the large inclined surface 2432. Moreover, when the main body 210 of the mutual inductor is installed, the small inclined surface 2431 is the force-bearing surface; when the main body 210 of the mutual inductor is disassembled, the large inclined surface 2432 is the force-bearing surface.

[0091] Among them, the stiffness of the positioning tooth 243 in the third elastic state is less than that of the positioning tooth 243 in the first elastic state, and the stiffness of the positioning tooth 243 in the first elastic state is less than that of the positioning tooth 243 in the second elastic state.

[0092] Thus, under the same elastic conditions of the positioning tooth 243, when the main body 210 of the mutual inductor is disassembled, the large inclined surface 2432 of the positioning tooth 243 is the force-bearing surface, making it relatively more difficult to retract. Therefore, the stiffness of the positioning tooth 243 in the third elastic state is adjusted to the minimum state, making it relatively easier for the positioning tooth 243 to retract when the main body 210 of the mutual inductor is disassembled.

[0093] Through the conversion between the three elastic states of the positioning tooth 243 and in combination with the settings of the small inclined surface 2431 and the large inclined surface 2432 of the positioning tooth 243, the installation process of the main body 210 of the mutual inductor saves time and effort, can automatically stop when reaching the specified installation position, and the stop position is accurate; moreover, after the main body 210 of the mutual inductor is in the installation position, it cannot move backward, further ensuring the stability of the installation of the main body 210 of the mutual inductor. When disassembling the main body 210 of the mutual inductor, it is only necessary to adjust all the positioning teeth 243 to the third elastic state, which is convenient and time-saving for disassembly.

[0094] In this embodiment, an installation groove 233 is further formed on the upper end surface of the mounting seat 230. A tooth seat 250 is installed in the installation groove 233. Several positioning teeth 243 are elastically and telescopically installed in the tooth seat 250. Moreover, a receiving groove 251 is formed on the upper end surface of the tooth seat 250 so that during the process of the main body 210 of the mutual inductor, some of the positioning teeth 243 can be completely retracted into the receiving groove 251. A stepped hole 252 is formed in the receiving groove 251, and the number thereof is the same as that of the positioning teeth 243.

[0095] Among them, the large hole 253 in the stepped hole 252 is located above, and the small hole 254 is located below; the positioning tooth 243 includes a tooth body 2433 and a guide post 2434. The guide post 2434 is arranged in the large hole 253, and its size matches that of the large hole 253 so that the positioning tooth 243 can slide up and down telescopically; a first spring 255 is further arranged in the large hole 253, and its upper end abuts against the lower section of the guide post 2434, so that the positioning tooth 243 can be elastically telescopic.

[0096] The small hole 254 is a threaded hole and penetrates through the bottom of the tooth seat 250. An elastic adjustment bolt 256 is arranged in the small hole 254; an elastic adjustment block 257 is also arranged in the large hole 253. Thus, the lower end of the first spring 255 abuts against the upper end surface of the elastic adjustment block 257. By rotating the elastic adjustment bolt 256, the height position of the elastic adjustment block 257 is changed, and finally the initial compression degree of the first spring 255 is made different, so as to adjust the positioning tooth 243 to be in the first elastic state, the second elastic state or the third elastic state.

[0097] Correspondingly, a plurality of first through holes 234 are further formed in the bottom of the installation groove 233 so that the elastic adjustment bolt 256 penetrates through the bottom of the installation seat 230 and enters the small hole 254; and a plurality of second through holes 152 are also formed in the side plate 150 so that the elastic adjustment bolt 256 sequentially penetrates through the second through holes 152 and the first through holes 234 and enters the small hole 254, which is convenient for adjusting the elastic state of each positioning tooth 243 from the outside of the ring main unit 100.

[0098] It should be noted that when the installation position of the transformer main body 210 needs to be adjusted, the stiffness of the positioning teeth 243 at different positions is changed. That is, when adjusting the installation positions of the three transformer main bodies 210 in this embodiment, by rotating the elastic adjustment bolt 256, the three positioning teeth 243 are adjusted from the first elastic state to the second elastic state, and the same number of positioning teeth 243 are adjusted from the second elastic state to the first elastic state.

[0099] It can be understood that when adjusting the installation position of the transformer main body 210 by the above operation method, the moving stroke of the transformer main body 210 can only be an integer multiple of the length of the positioning tooth 243.

[0100] In order to eliminate the above problems, in this embodiment, the tooth seat 250 is slidably installed in the installation groove 233 so as to be adjusted when the moving stroke of the transformer main body 210 is not an integer multiple of the length of the positioning tooth 243.

[0101] Specifically, a guiding rib 235 is arranged on the inner side wall of the installation groove 233. Correspondingly, a sliding through groove 258 is formed on the outer side wall of the tooth seat 250, and the shape and size of the sliding through groove 258 match those of the guiding rib 235, so as to ensure the left and right sliding of the tooth seat 250 and limit the moving freedom of the tooth seat 250 in other directions.

[0102] In this embodiment, an active adjustment assembly 260 is arranged on one side of the tooth seat 250, and a driven adjustment assembly 270 is arranged on the other side. The active adjustment assembly 260 can quantitatively adjust the left and right sliding distance of the tooth seat 250, and the active adjustment assembly 260 and the driven adjustment assembly 270 respectively limit the position of the tooth seat 250 on the left and right sides of the tooth seat 250 to limit the position of the tooth seat 250 after adjustment.

[0103] Specifically, wedge-shaped extrusion blocks 259 are respectively arranged at the left and right ends of the tooth seat 250. The active adjustment component 260 includes a wedge-shaped active top block 261 and an active adjustment bolt 262. The shape and size of the wedge-shaped active top block 261 match those of the wedge-shaped extrusion block 259. An active guide groove 236 is further formed at the bottom of the installation groove 233. The wedge-shaped active top block 261 is slidably located in the active guide groove 236. A first threaded hole 237 is further arranged at the bottom of the active guide groove 236. The active adjustment bolt 262 is threadedly connected to the first threaded hole 237, and the active adjustment bolt 262 abuts against the lower end surface of the wedge-shaped active top block 261;

[0104] The driven adjustment component 270 includes a wedge-shaped driven top block 271 and a driven adjustment bolt 272. The shape and size of the wedge-shaped driven top block 271 match those of the wedge-shaped extrusion block 259. A driven guide groove 238 is further formed at the bottom of the installation groove 233. The wedge-shaped driven top block 271 is slidably located in the driven guide groove 238. A second threaded hole 239 is further arranged at the bottom of the driven guide groove 238. The driven adjustment bolt 272 is threadedly connected to the second threaded hole 239, and the driven adjustment bolt 272 abuts against the lower end surface of the wedge-shaped driven top block 271.

[0105] It can be understood that an active adjustment hole 153 and a driven adjustment hole 154 are further formed on the side plate 150, so that the active adjustment bolt 262 and the driven adjustment bolt 272 respectively penetrate through the active adjustment hole 153 and the driven adjustment hole 154 and enter the first threaded hole 237 and the second threaded hole 239 in sequence, facilitating the adjustment of the position of the tooth seat 250 from the outside of the ring main unit 100.

[0106] It is worth noting that the size of the first through hole 234 on the mounting seat 230 is larger than that of the small hole 254. At the same time, the size of the second through hole 152 on the side plate 150 is also larger than that of the small hole 254, so that when adjusting the position of the tooth seat 150, the elastic adjustment bolt 256 can move left and right along with the tooth seat 250, facilitating the adjustment from the outside of the side plate 150, that is, from the outside of the ring main unit 100.

[0107] It can be understood that when the tooth seat 150 needs to move to the left, rotate the active adjustment bolt 262 to make the wedge-shaped active top block 261 displace upward; when the tooth seat 150 needs to move to the right, rotate the active adjustment bolt 262 in the opposite direction to make the wedge-shaped active top block 261 displace downward. Whether the tooth seat 150 needs to move to the left or right, it is necessary to pre-rotate the driven adjustment bolt 272 to make the wedge-shaped driven top block 271 move to the lowest position, thereby releasing the restriction of the driven adjustment component 270 on the position of the tooth seat 150.

[0108] Thus, when the tooth seat 150 needs to be moved to change its position, first, the restriction on the position of the tooth seat 150 by the driven adjustment assembly 270 is released; then, by rotating the active adjustment bolt 262, the tooth seat 150 is moved left or right. After the tooth seat 150 is moved in place, the restriction on the position of one side of the tooth seat 150 ( Figure 13 the right side of the perspective) is completed; finally, the driven adjustment bolt 272 is rotated to make the wedge-shaped driven top block 271 move upward. When the driven adjustment bolt 272 is tightened until it can no longer be rotated, the restriction on the position of the other side of the tooth seat 150 ( Figure 13 the left side of the perspective) is completed, and then the position adjustment of the tooth seat 150 is completed.

[0109] However, in the above adjustment process, when the driven adjustment bolt 272 is rotated to make the wedge-shaped driven top block 271 move upward, it is necessary to manually feel whether the tightening degree of the driven adjustment bolt 272 is in place. If it is not tight enough, there will still be room for the tooth seat 150 to move, which will not only affect the position accuracy of the tooth seat 150, but also affect the installation stability of the main body 210 of the current transformer (the main body 210 of the current transformer will shake with the tooth seat 150); if it is too tight, when the tooth seat 150 moves to the right, it will generate too much extrusion force on the active adjustment assembly 260, and even an interference phenomenon will occur. The excessive displacement of the tooth seat 150 affects the position accuracy, and moreover, the excessive extrusion force will also have a negative impact on the entire structure.

[0110] To eliminate the above problems, in this embodiment, the wedge-shaped driven top block 271 includes a top block body 273 and a driving connection block 274. A connection groove 275 is formed at the bottom of the top block body 273. The driving connection block 274 is slidably disposed inside the connection groove 275, and the driven adjustment bolt 272 abuts against the lower end surface of the driving connection block 274;

[0111] Wherein, a ball sliding groove 278 is formed on the side surface of the driving connection block 274. A ball 276 is slidably disposed in the ball sliding groove 278. A second spring 279 is also disposed in the ball sliding groove 278. One end of the second spring 279 abuts against the bottom surface of the ball sliding groove 278, and the other end abuts against the lower end surface of the ball 276. A plurality of meshing pits 277 arranged in a vertical array are formed on the inner wall of the connection groove 275, and the shape and size of the meshing pits 277 match those of the ball 276.

[0112] With this setting, when the driven adjustment bolt 272 is rotated to move the tooth seat 150 to the right, when the tooth seat 150 has not moved in place, the driven adjustment bolt 272 moves upward to drive the driving connection block 274 to move upward. Under the elastic force of the second spring 279, the ball 276 extends out of the ball sliding groove 278 and remains meshed with the meshing pit 277. The driving connection block 274 drives the top block body 273 to move upward, thereby driving the tooth seat 150 to continue moving to the right;

[0113] When the tooth seat 150 moves into position, the driven adjustment bolt 272 continues to move upward to drive the driving connection block 274 to move upward, and the squeezing force of the meshing pit 277 on the marble 276 exceeds the elastic force of the second spring 279, and the marble 276 cannot keep extending out of the marble sliding groove 278. The marble 276 jumps from one meshing pit 277 to the adjacent meshing pit 277 above. Although the driving connection block 274 is still moving upward, it can no longer drive the top block body 273 to move upward together, so that the tooth seat 150 automatically stops moving to the right. At this time, the operator can stop rotating the driven adjustment bolt 272 when he feels the jumping of the marble 276.

[0114] Thus, the negative impact caused by relying on manual feeling of whether the tightening degree of the driven adjusting bolt 272 is in place is avoided, and the degree of squeezing of the gear seat 150 by the wedge-shaped driven top block 271 is only related to the elastic coefficient of the second spring 279.

[0115] In this embodiment, the threaded portion of the active adjustment bolt 262 is provided with a scale groove 2621, and the bottom of the scale groove 2621 is provided with a scale 2622, so as to accurately control the up and down displacement of the active adjustment bolt 262, and then accurately control the left and right displacement of the gear seat 150.

[0116] The voltage transformer for the ring main unit of this embodiment is used for the installation of transformer bodies 210 of different sizes and for the installation of transformer bodies 210 at different positions:

[0117] When adjusting in the vertical direction, for adjustments with larger distances, the third mounting hole 232 can be installed corresponding to the fourth mounting hole 122 at different positions; for adjustments with smaller distances, the fourth mounting hole 122 can be aligned with positions of different heights of the waist-shaped third mounting hole 232; the above two methods can also be combined to accurately adjust the vertical installation parameters of the transformer body 210.

[0118] When adjusting in the left and right directions, if the travel of the transformer body 210 is an integer multiple of the length of the positioning tooth 243, it is only necessary to adjust part of the elastic adjustment bolt 256; if the travel is less than one times the length of the positioning tooth 243, it is only necessary to adjust the active adjustment bolt 262 and the driven adjustment bolt 272; if the travel is less than one times the length of the positioning tooth 243 and is not an integer multiple, it is necessary to jointly adjust part of the elastic adjustment bolt 256, the active adjustment bolt 262 and the driven adjustment bolt 272.

[0119] The height h that needs to be changed by the active adjustment bolt 262 is:

[0120]

[0121] h is the height that the active adjustment bolt 262 needs to change, L is the stroke that the main body 210 of the mutual inductor moves, n is a positive integer, d is the length of the positioning tooth 243, and α is the angle of the acute angle in the cross-section of the wedge-shaped extrusion block 259.

[0122] Through the formula for the height change of the active adjustment bolt 262, the height that the active adjustment bolt 262 needs to move upward or downward can be quickly and accurately calculated. Combined with the scale 2622 provided on the active adjustment bolt 262, it is more conducive to conveniently adjusting the height position of the active adjustment bolt 262.

[0123] As described above, only the specific preferred embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A voltage transformer for a ring main unit, comprising a ring main unit and a voltage transformer installed inside the ring main unit; The ring main unit includes a main body framework, and the main body framework is composed of a plurality of transverse frameworks and longitudinal frameworks; The voltage transformer includes a transformer main body and a transformer mounting seat assembly. There are a pair of transformer mounting seat assemblies, which are arranged vertically. Both transformer mounting seat assemblies are detachably installed on a pair of adjacent longitudinal frameworks; The transformer mounting seat assembly includes a mounting seat and a connection assembly installed on the mounting seat. The mounting seat is detachably installed on a pair of adjacent longitudinal frameworks, and the transformer main body is detachably installed on the connection assembly through its base; It is characterized in that: The connection assembly includes a track fixedly installed on the upper end face of the mounting seat, and a "convex”-shaped track groove is formed in the track; a slider is fixedly installed on the lower end face of the base, and the shape and size of the slider are the same as those of the track groove; Among them, the connection assembly further includes a plurality of positioning teeth arranged on the upper end face of the mounting seat. A mating tooth is fixedly installed on the lower end face of the base, and the shape and size of the mating tooth match those of the positioning teeth; The positioning teeth are configured to be elastically retractable to extend out of the upper end face of the mounting seat or retract into the upper end face of the mounting seat. When the transformer main body is installed, some of the plurality of positioning teeth are in a first elastic state, and the rest of the plurality of positioning teeth are in a second elastic state. The positioning teeth in the first elastic state retract into the upper end face of the mounting seat, and the transformer main body can slide. When it touches the positioning teeth in the second elastic state, the transformer main body cannot slide; when the transformer main body is disassembled, all of the plurality of positioning teeth are in a third elastic state; Among them, the positioning teeth are triangular teeth, including a small inclined surface and a large inclined surface. The inclination angle of the small inclined surface is smaller than that of the large inclined surface; and when the transformer main body is installed, the small inclined surface is the force-bearing surface; when the transformer main body is disassembled, the large inclined surface is the force-bearing surface; Among them, the stiffness of the positioning teeth in the third elastic state is less than the stiffness of the positioning teeth in the first elastic state, and the stiffness of the positioning teeth in the first elastic state is less than the stiffness of the positioning teeth in the second elastic state; An installation groove is further formed in the upper end face of the mounting seat. A tooth seat is installed in the installation groove. A plurality of positioning teeth are elastically retractably installed in the tooth seat, and a receiving groove is further formed in the upper end face of the tooth seat. A stepped hole is formed in the receiving groove, and the number thereof is the same as that of the positioning teeth; Among them, the large hole in the stepped hole is located above, and the small hole is located below; the positioning tooth includes a tooth body and a guide post. The guide post is arranged in the large hole, and its size matches that of the large hole; a first spring is further arranged in the large hole, and its upper end abuts against the lower cross section of the guide post, so that the positioning tooth can be elastically retractable; the small hole is a threaded hole and penetrates through the bottom of the tooth seat. An elastic adjusting bolt is arranged in the small hole; an elastic adjusting block is further arranged in the large hole, and the lower end of the first spring abuts against the upper end face of the elastic adjusting block; A plurality of first through holes are further formed in the bottom of the installation groove, so that the elastic adjusting bolt can penetrate through the bottom of the mounting seat and enter the small hole; And a plurality of second through holes are further formed in the side plate, so that the elastic adjusting bolt can penetrate through the second through holes and the first through holes in sequence and enter the small hole.

2. The voltage transformer for a ring main unit according to claim 1, wherein: The ring main unit further includes a cabinet door and a control panel located in the front, side plates located on both sides, a rear vertical plate located at the rear, a top plate located above, and a bottom plate located below; The first mounting holes are arranged in an array on both the transverse skeleton and the longitudinal skeleton, and the second mounting holes are also arranged in an array on the cabinet door, the control panel, the side plates, the rear vertical plate, the top plate, and the bottom plate, so as to mount them on the main skeleton through bolt assemblies.

3. The voltage transformer for a ring main unit according to claim 2, wherein: Both ends of the mounting seat are provided with connecting plates, and a plurality of third mounting holes are arranged in an array on the connecting plates. A plurality of fourth mounting holes are also arranged in an array on the longitudinal skeleton, and are fixedly connected by passing through the third mounting holes and the fourth mounting holes with a bolt assembly; Wherein, the number of the fourth mounting holes is more than that of the third mounting holes, and the third mounting holes are waist-shaped holes.

4. The voltage transformer for a ring main unit according to claim 3, wherein: The inner side wall of the mounting groove is provided with a guiding rib, and a sliding through groove is formed on the outer side wall of the tooth seat, and the shape and size of the sliding through groove match those of the guiding rib; Wherein, an active adjustment assembly is arranged on one side of the tooth seat, and a driven adjustment assembly is arranged on the other side. The active adjustment assembly can quantitatively adjust the distance of the left-right sliding of the tooth seat, and the active adjustment assembly and the driven adjustment assembly respectively limit the tooth seat on the left and right sides.

5. The voltage transformer for a ring main unit according to claim 4, wherein: Wedge-shaped extrusion blocks are respectively arranged at the left and right ends of the tooth seat. The active adjustment assembly includes a wedge-shaped active top block and an active adjustment bolt. The shape and size of the wedge-shaped active top block match those of the wedge-shaped extrusion block. An active guiding groove is further formed at the bottom of the mounting groove. The wedge-shaped active top block is slidably located in the active guiding groove. A first threaded hole is further arranged at the bottom of the active guiding groove. The active adjustment bolt is threadedly connected to the first threaded hole, and the active adjustment bolt abuts against the lower end surface of the wedge-shaped active top block; The driven adjustment assembly includes a wedge-shaped driven top block and a driven adjustment bolt. The shape and size of the wedge-shaped driven top block match those of the wedge-shaped extrusion block. A driven guiding groove is further formed at the bottom of the mounting groove. The wedge-shaped driven top block is slidably located in the driven guiding groove. A second threaded hole is further arranged at the bottom of the driven guiding groove. The driven adjustment bolt is threadedly connected to the second threaded hole, and the driven adjustment bolt abuts against the lower end surface of the wedge-shaped driven top block.

6. The voltage transformer for a ring main unit according to claim 5, wherein: An active adjustment hole and a driven adjustment hole are further formed on the side plate, so that the active adjustment bolt and the driven adjustment bolt respectively penetrate through the active adjustment hole and the driven adjustment hole and enter the first threaded hole and the second threaded hole in sequence; Wherein, the size of the first through hole on the mounting seat is larger than the small hole, and the size of the second through hole on the side plate is also larger than the small hole.

7. The voltage transformer for a ring main unit according to claim 6, wherein: The wedge-shaped driven top block includes a top block body and a driving connection block. A connection groove is formed at the bottom of the top block body. The driving connection block is slidably arranged inside the connection groove. The driven adjustment bolt abuts against the lower end surface of the driving connection block; Wherein, a marble sliding groove is formed on the side surface of the driving connection block, a marble is slidably arranged in the marble sliding groove, a second spring is further arranged in the marble sliding groove, one end of the second spring abuts against the bottom surface of the marble sliding groove, the other end abuts against the lower end surface of the marble, and a plurality of vertically arrayed meshing pits are formed on the inner wall of the connection groove, and the shape and size of the meshing pits match those of the marble.

8. The voltage transformer for ring main unit according to claim 7, wherein: The height h that the active adjustment bolt needs to change is: h is the height that the active adjustment bolt needs to change, L is the stroke of the main body of the mutual inductor moving, n is a positive integer, and d is the length of the positioning teeth. is the angle of the acute angle in the cross-section of the wedge-shaped extrusion block.

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