Voltage transformer with adjustable phase spacing
By designing a detachable voltage transformer with adjustable phase spacing, the problem of inconvenience in procurement and maintenance caused by fixed phase spacing of three-phase voltage transformers is solved. It enables flexible adjustment and efficient installation, reduces costs and inventory management difficulties, and enhances equipment stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU JINGJIANG INSTR TRANSFORMER FACTORY
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-23
AI Technical Summary
The phase spacing of existing three-phase voltage transformers is fixed and cannot be adjusted individually, which leads to increased procurement costs, inconvenient maintenance, and difficulty in inventory management, especially when customer order parameters are diversified.
Design a detachable phase-gap adjustable voltage transformer, using detachable first and second single phase transformers, and achieve phase-gap adjustment through fused core sleeves and bolt connections, combined with mechanical locking of AB glue and spring washers to ensure stability and flexibility.
It enables flexible adjustment of phase spacing, improves adjustment accuracy and installation and maintenance efficiency, reduces costs and inventory management difficulty, and enhances the equipment's vibration resistance and thermal cycling stability.
Smart Images
Figure CN224400204U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field, specifically to a voltage transformer with adjustable phase spacing. Background Technology
[0002] In existing technologies, three-phase voltage transformers are typically monolithic structures with pre-fixed phase spacing, lacking individual adjustment capabilities. Furthermore, a single three-phase transformer cannot be split into two units or used independently. When adjustments to phase spacing or changes to the copper busbar connection method are required on-site, the entire transformer must be repurchased, significantly increasing procurement costs and delivery time, making on-site maintenance and replacement inconvenient, and impacting power supply system maintenance efficiency. Moreover, inventory management becomes more challenging when different customer orders have diverse parameters.
[0003] Therefore, existing technologies have shortcomings and need to be improved and developed. Utility Model Content
[0004] This utility model provides a voltage transformer with adjustable phase spacing to address the problems of existing three-phase voltage transformers, which are typically integral structures with pre-fixed phase spacing and lack individual adjustment capabilities; furthermore, a single three-phase voltage transformer cannot be split into two units or used individually. When phase spacing needs to be adjusted or the copper busbar connection method needs to be changed on-site, the entire transformer must be purchased again, leading to a significant increase in procurement costs and delivery time, inconvenience in on-site maintenance and replacement, and impacting the efficiency of power supply system maintenance; additionally, inventory management becomes more difficult when different customer order parameters vary.
[0005] This utility model provides a voltage transformer with adjustable phase spacing, including a first single-phase transformer and a second single-phase transformer detachably connected to a base plate. The top of the first single-phase transformer is bonded to the tail of a first fuse sleeve. The B end of the first single-phase transformer is located inside the tail of the first fuse sleeve. A first nut is embedded in the head of the first fuse sleeve, and a primary contact is threaded onto the first nut. A primary insert is detachably connected to the B end of the first single-phase transformer via bolts. The axis of the primary insert is parallel to the base plate. A spring is arranged between the primary insert and a fuse installed in the first fuse sleeve. The top of the second single-phase transformer is bonded to the tail of a second fuse sleeve. The A end of the second single-phase transformer is located inside the tail of the second fuse sleeve. A second nut is embedded in the head of the second fuse sleeve, and a primary contact is threaded onto the second nut. A primary insert is detachably connected to end A of the single-phase transformer via bolts. The axis of the primary insert is parallel to the base plate. A spring is arranged between the primary insert and the fuse installed in the second fuse sleeve. The tail of the third fuse sleeve is bonded between the top of the first single-phase transformer and the top of the second single-phase transformer. A metal connecting piece is connected between end A and end B of the first single-phase transformer. The metal connecting piece, end A of the first single-phase transformer, and end B of the second single-phase transformer are located inside the tail of the third fuse sleeve. A third nut is embedded in the head of the third fuse sleeve. A primary contact is threaded onto the third nut. A primary insert is detachably connected to the middle of the metal connecting piece via bolts. The axis of the primary insert is parallel to the base plate. A spring is arranged between the primary insert and the fuse installed in the third fuse sleeve.
[0006] Furthermore, the space within the first fuse sleeve for accommodating the fuse is defined as the first positioning groove, the space within the first fuse sleeve for accommodating the fuse is defined as the second positioning groove, and the space within the first fuse sleeve for accommodating the fuse is defined as the third positioning groove. The axis of the first positioning groove is coaxial with the axis of the primary insert within the first fuse sleeve, the axis of the second positioning groove is coaxial with the axis of the primary insert within the second fuse sleeve, and the axis of the third positioning groove is coaxial with the axis of the primary insert within the third fuse sleeve.
[0007] Furthermore, the adhesive used to bond the top of the first single-phase sensor to the tail of the first fuse sleeve and the tail of the third fuse sleeve is AB glue, and the adhesive used to bond the top of the second single-phase sensor to the tail of the second fuse sleeve and the tail of the third fuse sleeve is AB glue.
[0008] Furthermore, the connection method for the B end of the first single mutual inductor to the primary insert via bolts is as follows: the primary insert has a mounting surface parallel to its axis, and a through hole is provided on the mounting surface. The bolt for detachably connecting the B end of the first single mutual inductor and the primary insert passes through the mounting surface and the spring washer in sequence and is threaded to the B end of the first single mutual inductor. The connection method for the A end of the second single mutual inductor to the primary insert via bolts is as follows: the primary insert has a mounting surface parallel to its axis, and a through hole is provided on the mounting surface. The bolt for detachably connecting the A end of the second single mutual inductor and the primary insert passes through the mounting surface and the spring washer in sequence and is threaded to the A end of the second single mutual inductor.
[0009] Furthermore, the connection method in which the metal connecting piece is detachably connected to the primary insert by bolts is as follows: the bolts used to detachably connect the metal connecting piece and the primary insert pass through the flat washer, the mounting surface and the spring washer in sequence and are threaded with at least one hexagonal nut.
[0010] Furthermore, the bolts for detachably connecting the B end of the first single mutual sensor to the primary insert, the bolts for detachably connecting the A end of the second single mutual sensor to the primary insert, and the bolts for detachably connecting the metal connecting piece to the primary insert are flat-head bolts.
[0011] Furthermore, a countersunk hole is provided on the bottom surface of the base plate, and a threaded hole is provided at the bottom of the first single mutual sensor and the second single mutual sensor. A screw passes through the countersunk hole located under the first single mutual sensor and is threadedly connected to the first single mutual sensor. A screw passes through the countersunk hole located under the second single mutual sensor and is threadedly connected to the second single mutual sensor.
[0012] Furthermore, the screw is a Phillips head countersunk screw.
[0013] Furthermore, the first fuse sleeve, the second fuse sleeve, and the third fuse sleeve are insulating fuse sleeves.
[0014] Furthermore, nameplates and polarity marking plates are also attached to the first and second single mutual sensors.
[0015] Beneficial effects:
[0016] As can be seen from the above technical solutions, this utility model provides a voltage transformer with adjustable phase spacing:
[0017] 1. Flexible in use: The first, second, and third fuse sleeves, primary inserts, metal connecting pieces, and other components can all be disassembled and assembled independently, and can be quickly used with commonly used single-phase current transformers on the market, realizing flexible switching between three-phase whole machine mode and single-phase module mode, reducing the dependence on dedicated integrated current transformers.
[0018] 2. High phase spacing adjustment accuracy: Multiple coaxial positioning slots are reserved inside the fuse sleeve, which can accurately insert the fuse according to the modular spacing standard and connect it in series with the primary insert, reducing the relative position error. Moreover, by changing the spacing between the first single mutual inductor and the second single mutual inductor, or by changing the length of the metal connecting piece from end A of the first single mutual inductor to end B of the second single mutual inductor, it is possible to adjust it into three mutual inductors with different phase spacings. The adjustment accuracy is controllable and high.
[0019] 3. High reliability: AB glue is used to bond the tail of the fused core sleeve to the top of the transformer, and flat-head bolts and spring washers are used for mechanical locking to improve resistance to vibration, thermal cycling loosening and contact stability under long-term operation. The washer design can make the pressure on the contact surface evenly distributed, ensuring stable operation over a long period of time.
[0020] 4. High installation and maintenance efficiency: AB glue is used to bond the tail of the fuse sleeve to the top of the transformer, which can be easily disassembled, replaced or maintained. The base plate and the transformer are fixed with countersunk screws with cross slots. Only a hand screwdriver is needed to complete the module disassembly and phase spacing adjustment on site. The time spent on disassembling a single module or replacing the whole is small, which shortens the installation and maintenance time and improves efficiency.
[0021] 5. Reduced costs: The fuse sleeve, primary insert, metal connecting piece, fastener, and base plate can all be designed according to industrial standard parts, and can be mass-produced and spare parts can be purchased in a unified manner. Compared with customized integrated current transformers, the manufacturing and inventory costs per unit can be reduced.
[0022] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.
[0023] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description
[0024] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:
[0025] Figure 1 This is a front view of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0026] Figure 2 This is a side view of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0027] Figure 3 This is a top view of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0028] Figure 4 This is a top view of the first fuse sleeve of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0029] Figure 5 This is a top view of the third fuse sleeve of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0030] Figure 6 This is a cross-sectional view of the first fuse sleeve of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0031] Figure 7 This is a top view of the metal connecting piece of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0032] Figure 8 This is a front view of the metal connecting piece of a voltage transformer with adjustable phase spacing according to an embodiment of this application.
[0033] Explanation of icon numbers:
[0034] 1. Base plate; 2. First single mutual sensor; 3. Second single mutual sensor; 4. First fuse sleeve; 5. Primary contact; 6. Primary insert; 7. Fuse; 8. Second fuse sleeve; 9. Third fuse sleeve; 10. Metal connecting piece. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.
[0036] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.
[0037] In existing technologies, three-phase voltage transformers are typically monolithic structures with pre-fixed phase spacing, lacking individual adjustment capabilities. Furthermore, a single three-phase transformer cannot be split into two units or used independently. When adjustments to phase spacing or changes to the copper busbar connection method are required on-site, the entire transformer must be repurchased, significantly increasing procurement costs and delivery time, making on-site maintenance and replacement inconvenient, and impacting power supply system maintenance efficiency. Moreover, when different customer orders have diverse parameters, inventory management becomes more challenging.
[0038] In view of this, the present invention provides a voltage transformer with adjustable phase spacing, referring to... Figure 1 , Figure 2 and Figure 3 The system includes a first single-phase transformer 2 and a second single-phase transformer 3, which are detachably connected to a base plate 1. The base plate 1 has a flat mounting surface and a countersunk hole on the bottom surface for detachably connecting the first single-phase transformer 2 and the second single-phase transformer 3. The first single-phase transformer 2 and the second single-phase transformer 3 are single-phase transformers with the same structure and model, and are detachably connected to the base plate 1 by screws. Their terminals are defined as terminal A and terminal B, respectively.
[0039] The top of the first single mutual sensor 2 is bonded to the tail of the first fuse sleeve 4. The B end of the first single mutual sensor 2 is located inside the tail of the first fuse sleeve 4. The head of the first fuse sleeve 4 is embedded with a first nut, and a primary contact 5 is threaded onto the first nut. The B end of the first single mutual sensor 2 is detachably connected to a primary insert 6 by bolts. The axis of the primary insert 6 is parallel to the base plate 1. A spring is arranged between the primary insert 6 and the fuse 7 installed inside the first fuse sleeve 4. The top of the second single mutual sensor 3 is bonded to the tail of the second fuse sleeve 8. The A end of the second single mutual sensor 3 is located inside the tail of the second fuse sleeve 8. The head of the second fuse sleeve 8 is embedded with a second nut, and a primary contact 5 is threaded onto the second nut. The A end of the second single mutual sensor 3 is detachably connected to a primary insert 6 by bolts. The axis of the primary insert 6 is parallel to the base plate 1. A spring is arranged between the primary insert 6 and the fuse 7 installed inside the second fuse sleeve 8.
[0040] The first single mutual inductor 2 and the second single mutual inductor 3 are connected to the fuse sleeve in the same way. Since the B end of the first single mutual inductor 2 is located inside the tail of the first fuse sleeve 4, this phase is designated as phase C of the three-phase mutual inductor. The A end of the second single mutual inductor 3 is located inside the tail of the second fuse sleeve 8, so this phase is designated as phase A.
[0041] The tail of the third fuse sleeve 9 is bonded between the top of the first single mutual inductor 2 and the top of the second single mutual inductor 3. A metal connecting piece 10 is connected between the A end and the B end of the first single mutual inductor 2. The metal connecting piece 10, the A end of the first single mutual inductor 2, and the B end of the second single mutual inductor 3 are located inside the tail of the third fuse sleeve 9. The two ends of the metal connecting piece 10 are respectively connected to the A end of the first single mutual inductor 2 and the B end of the second single mutual inductor 3, which are located on the same horizontal plane. The tail of the third fuse sleeve 9 covers the metal connecting piece 10, the A end of the first single mutual inductor 2, and the B end of the second single mutual inductor 3. A third nut is embedded in the head of the third fuse sleeve 9. A primary contact 5 is threaded onto the third nut. A primary insert 6 is detachably connected to the middle of the metal connecting piece 10 by bolts. The axis of the primary insert 6 is parallel to the base plate 1. A spring is arranged between the primary insert 6 and the fuse 7 installed inside the third fuse sleeve 9.
[0042] Since the metal connecting piece 10, the A end of the first single mutual inductor 2 and the B end of the second single mutual inductor 3 are located inside the tail of the third fused core sleeve 9, this phase is regarded as the B phase of the three mutual inductors.
[0043] Reference Figures 4-6 The first fuse sleeve 4, the second fuse sleeve 8, and the third fuse sleeve 9 (hereinafter referred to as the first, second, and third fuse sleeves 9) can be made of epoxy insulation material, defined as follows: Figure 4 , Figure 5The left side of the first fuse sleeve 4, where the primary contact 5 is installed, is the head; the right side of the first fuse sleeve 4, where it is bonded, is the tail. The tail is bonded to the top of the single-phase current transformer, and the head has a metal nut and the primary contact 5 embedded inside. Similarly, the definitions of the parts for the second fuse sleeve 8 and the third fuse sleeve 9 are the same. The first fuse sleeve 4 and the second fuse sleeve 8 have the same structure, while the third fuse sleeve 9 additionally has a covered metal connecting piece 10, the first single-phase current transformer 2A end, and the other end connected to the second single-phase current transformer B end. (Refer to...) Figure 6 The first and second fuse elements have the same internal structure, and the third fuse sleeve 9 has a similar internal structure to the first and second. The primary insert 6 is a metal block with its axis parallel to the base plate 1, used to connect the terminals of the single current transformer to the fuse 7. (Refer to...) Figures 7-8 The metal connecting piece 10 is a flat metal component, which can be made of copper. One end of the metal connecting piece 10 is electrically connected to the first single-phase current transformer 2A terminal, and the other end is electrically connected to the second single-phase current transformer B terminal, and is positioned together with the third fuse sleeve 9 and its primary insert 6. The tails of the first, second, and third fuse sleeves 9 are respectively bonded to the top of the corresponding current transformers to form preliminary fixation and insulation isolation; the nut inside the fuse sleeve head is threaded with the primary contact 5 to achieve quick connection with the external power busbar; the fuse 7 is placed in the positioning space inside the fuse sleeve, and a spring is arranged between the fuse 7 and the primary insert 6. When the fuse 7 is placed inside the fuse sleeve, on the one hand, the compression spring makes the fuse 7 tightly connected to the primary contact 5 and the primary insert 6, and on the other hand, a series circuit is formed; the middle part of the metal connecting piece 10 is connected in series with the fuse 7 inside the third fuse sleeve 9 through the primary insert 6 to achieve electrical connection between the first current transformer A terminal and the second current transformer B terminal. It achieves modular combination of single-phase transformer, fuse sleeve, primary insert 6, and metal connecting piece 10; due to the detachable connection and bonding method, it supports switching between three-phase and single-phase connection methods, and speeds up the on-site assembly cycle and reduces customization costs.
[0044] In some embodiments, the space within the first fuse sleeve 4 for accommodating the fuse 7 is defined as the first positioning groove, the space within the first fuse sleeve 4 for accommodating the fuse 7 is defined as the second positioning groove, and the space within the first fuse sleeve 4 for accommodating the fuse 7 is defined as the third positioning groove. The axis of the first positioning groove is coaxial with the axis of the primary insert 6 within the first fuse sleeve 4, the axis of the second positioning groove is coaxial with the axis of the primary insert 6 within the second fuse sleeve 8, and the axis of the third positioning groove is coaxial with the axis of the primary insert 6 within the third fuse sleeve 9.
[0045] First, second, and third positioning grooves are respectively opened in the first fuse sleeve 4, and the axis of the positioning groove is coaxial with the axis of the corresponding primary insert 6. When installing the primary fuse 7, it is convenient to fix the fuse 7 in the positioning groove, and the fuse 7 can be aligned with the center of the primary insert 6 in a short time. Furthermore, by limiting the size of the positioning groove, the fuse 7 can be prevented from sliding, thus meeting the needs of quick adjustment during installation and maintenance.
[0046] In some embodiments, the adhesive used to bond the top of the first single mutual sensor 2 to the tail of the first fusible sleeve 4 and the tail of the third fusible sleeve 9 is AB glue, and the adhesive used to bond the top of the second single mutual sensor 3 to the tail of the second fusible sleeve 8 and the tail of the third fusible sleeve 9 is AB glue.
[0047] The adhesive is an AB two-component epoxy resin, used on the top of the first and second single-phase transformers 3 and the tail of the fuse sleeve, as well as the tail of the third fuse sleeve 9. The AB adhesive reacts chemically at room temperature to form a high-strength adhesive layer, chemically bonding to the surfaces of the transformers and bushing substrates. This adhesive layer provides both mechanical fixing and electrical insulation, offering secondary insulation protection for the fuse sleeve. Using AB adhesive saves costs and increases installation speed; furthermore, it facilitates separation when disassembling a three-phase transformer for use as a single-phase transformer.
[0048] In some embodiments, the connection method of the B end of the first single mutual sensor 2 being detachably connected to the primary insert 6 by bolts is as follows: the primary insert 6 has a mounting surface parallel to the axis of the primary insert 6, and a through hole is provided on the mounting surface. The bolt for detachably connecting the B end of the first single mutual sensor 2 and the primary insert 6 passes through the mounting surface and the spring washer in sequence and is threaded to the B end of the first single mutual sensor 2; the connection method of the A end of the second single mutual sensor 3 being detachably connected to the primary insert 6 by bolts is as follows: the primary insert 6 has a mounting surface parallel to the axis of the primary insert 6, and a through hole is provided on the mounting surface. The bolt for detachably connecting the A end of the second single mutual sensor 3 and the primary insert 6 passes through the mounting surface and the spring washer in sequence and is threaded to the A end of the second single mutual sensor 3.
[0049] The flat-head bolts pass sequentially through the mounting surface through-holes and spring washers to the transformer terminals via threaded connections, ensuring reliable conductive contact. The spring washers maintain bolt tension under vibration or thermal expansion and contraction conditions, preventing loosening. The detachable connection of the flat-head bolts ensures low and stable contact resistance in the primary circuit, avoiding interference with cabinet components, and also improves vibration resistance and extends maintenance intervals.
[0050] In some embodiments, the connection method in which the metal connecting piece 10 is detachably connected to the primary insert 6 via bolts is as follows: the bolts used for detachably connecting the metal connecting piece 10 and the primary insert 6 pass sequentially through a flat washer, a mounting surface, and a spring washer, and are threaded with at least one hexagonal nut. Because there is an assembly gap between the metal connecting piece 10 and the mounting surface, a flat washer is added to evenly distribute the contact pressure.
[0051] In some embodiments, the bolts for detachably connecting the B end of the first single mutual sensor 2 and the primary insert 6, the bolts for detachably connecting the A end of the second single mutual sensor 3 and the primary insert 6, and the bolts for detachably connecting the metal connecting piece 10 and the primary insert 6 are flat-head bolts.
[0052] In some embodiments, a countersunk hole is provided on the bottom surface of the base plate 1, and a threaded hole is provided at the bottom of the first single mutual sensor 2 and the second single mutual sensor 3. A screw passes through the countersunk hole located under the first single mutual sensor 2 and is threadedly connected to the first single mutual sensor 2. A screw passes through the countersunk hole located under the second single mutual sensor 3 and is threadedly connected to the second single mutual sensor 3.
[0053] The screw head is recessed into the countersunk hole on the bottom surface of the base plate 1, flush with the bottom surface of the base plate 1; the screw tail is fastened to the threaded hole at the bottom of the current transformer, achieving horizontal and vertical positioning. This improves the overall rigidity of the component, prevents lateral displacement of the module, ensures structural flatness, and reduces interference with the outer casing.
[0054] In some embodiments, the screw is a Phillips head countersunk screw.
[0055] In some embodiments, the first fuse sleeve 4, the second fuse sleeve 8, and the third fuse sleeve 9 are insulating fuse sleeves.
[0056] In some embodiments, nameplates and polarity marking plates are also attached to the first single mutual sensor 2 and the second single mutual sensor 3.
[0057] When assembling a three-phase transformer from single-phase transformers, the following method is used:
[0058] 1. First, sand the surfaces of the first single mutual sensor 2 and the second single mutual sensor 3 that need to be bonded together;
[0059] 2. Install a primary insert 6 at the B end of the first single mutual sensor 2 and the A end of the second single mutual sensor 3. Install a metal connecting piece 10 between the A end of the first single mutual sensor 2 and the B end of the second single mutual sensor 3. Install the primary insert 6 in the middle of the metal connecting piece 10 and tighten the screws in place.
[0060] 3. Grind the surfaces of the first, second, and third fusion core sleeves 9 that need to be bonded;
[0061] 4. Test install the first, second, and third fuse sleeves 9. If the fuse 7 can be installed normally after the test, apply an appropriate amount of AB glue to the surfaces of the first, second, and third fuse sleeves 9 that need to be bonded, and clean up any excess AB glue. If they cannot be installed normally, replace the first, second, and third fuse sleeves 9 with other sizes.
[0062] 5. Select the spacing of the first, second, and third fuse sleeves 9 according to actual needs. After selection, glue the first, second, and third fuse sleeves 9 together. After gluing, place a heavy object on the top of the first, second, and third fuse sleeves 9 to press them down, so that the first, second, and third fuse sleeves 9 fit more tightly and reliably with the single mutual sensor.
[0063] 6. Apply AB glue to the outer ring of the nut and attach it to the inner side of the head of the first, second, and third fusion sleeves 9. Gently and slowly tap the side of the nut with a hammer to ensure that the nut plane is flush with the corresponding head plane of the first, second, and third fusion sleeves 9. Clean up any excess AB glue on the surface.
[0064] 7. Let stand for 6-8 hours until the AB glue is completely cured;
[0065] 8. After installing the spring and fuse 7, tighten the primary contact 5 with the nut. After finishing, check if the extension and retraction of the primary contact 5 can be pressed into place. If so, the installation is complete; otherwise, it needs to be reworked and adjusted.
[0066] When assembling a single-phase current transformer from three current transformers, the following method is used: Since AB glue softens at high temperatures, reducing its adhesiveness, a heat gun or hairdryer can be used to evenly blow hot air onto the AB glue connection area to soften it. Temperature and distance must be controlled during the softening process to avoid damaging the current transformer assembly. When the AB glue is softened enough to be pried open, a tool such as a thin plastic sheet or blade is carefully inserted into the connection gap and slowly pried open to separate the assembly. Remove the fused core sleeve and unscrew the metal connecting piece 10, resulting in two single-phase current transformers.
[0067] In summary, the voltage transformer with adjustable phase spacing provided by this utility model offers flexibility in use: the first, second, and third fuse sleeves 9, the primary insert 6, and the metal connecting piece 10 can all be independently disassembled and assembled, and can be quickly used with commercially available single-phase transformers, enabling flexible switching between three-phase integrated mode and single-phase modular mode, reducing reliance on dedicated integrated transformers. High phase spacing adjustment accuracy: multiple coaxial positioning slots are pre-reserved within the fuse sleeves, allowing for precise insertion of the fuse 7 according to modular spacing standards, and series connection with the primary insert 6, reducing relative position errors. Furthermore, by changing the spacing between the first single-phase transformer 2 and the second single-phase transformer 3, or by changing the length of the metal connecting piece 10 from end A of the first single-phase transformer 2 to end B of the second single-phase transformer 3, it is possible to adjust to three-phase transformers with different phase spacings, with controllable and high adjustment accuracy. High reliability: AB glue is used to bond the tail of the fuse sleeve to the top of the transformer, supplemented by mechanical locking with flat-head bolts and spring washers. This improves resistance to vibration, thermal cycling loosening, and contact stability under long-term operation. The washer design ensures even pressure distribution on the contact surface, guaranteeing stable operation over long periods. High installation and maintenance efficiency: The AB glue bonding allows for easy disassembly, replacement, or maintenance. The base plate 1 is fixed to the transformer using countersunk screws with Phillips head and Phillips head slots. Module disassembly and phase spacing adjustment can be completed on-site using only a hand screwdriver. Single module disassembly or overall replacement takes less time, shortening installation and maintenance time and improving efficiency. Reduced costs: The fuse sleeve, primary insert 6, metal connecting piece 10, fasteners, and base plate 1 are all designed according to industrial standard parts, allowing for mass production and centralized procurement of spare parts. Compared to customized integrated transformers, this reduces per-unit manufacturing and inventory costs.
[0068] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.
Claims
1. A voltage transformer with adjustable phase spacing, comprising a first single-phase transformer and a second single-phase transformer detachably connected to a base plate, characterized in that, The top of the first single mutual inductor is bonded to the tail of the first fuse sleeve. The B end of the first single mutual inductor is located inside the tail of the first fuse sleeve. The head of the first fuse sleeve is embedded with a first nut. A primary contact is threaded onto the first nut. The B end of the first single mutual inductor is detachably connected to a primary insert by bolts. The axis of the primary insert is parallel to the base plate. A spring is arranged between the primary insert and the fuse installed in the first fuse sleeve. The top of the second single-phase transformer is bonded to the tail of the second fuse sleeve. The A end of the second single-phase transformer is located inside the tail of the second fuse sleeve. The head of the second fuse sleeve is embedded with a second nut. A primary contact is threaded onto the second nut. The A end of the second single-phase transformer is detachably connected to a primary insert by bolts. The axis of the primary insert is parallel to the base plate. A spring is arranged between the primary insert and the fuse installed in the second fuse sleeve. The tail of a third fuse sleeve is bonded between the top of the first single mutual inductor and the top of the second single mutual inductor. A metal connecting piece is connected between the A end and the B end of the first single mutual inductor. The metal connecting piece, the A end of the first single mutual inductor, and the B end of the second single mutual inductor are located inside the tail of the third fuse sleeve. A third nut is embedded in the head of the third fuse sleeve. A primary contact is threaded onto the third nut. A primary insert is detachably connected to the middle of the metal connecting piece by a bolt. The axis of the primary insert is parallel to the base plate. A spring is arranged between the primary insert and the fuse installed inside the third fuse sleeve.
2. The voltage transformer with adjustable phase spacing according to claim 1, characterized in that, The space within the first fuse sleeve for accommodating the fuse is defined as the first positioning groove, the space within the first fuse sleeve for accommodating the fuse is defined as the second positioning groove, and the space within the first fuse sleeve for accommodating the fuse is defined as the third positioning groove. The axis of the first positioning groove is coaxial with the axis of the primary insert within the first fuse sleeve, the axis of the second positioning groove is coaxial with the axis of the primary insert within the second fuse sleeve, and the axis of the third positioning groove is coaxial with the axis of the primary insert within the third fuse sleeve.
3. The voltage transformer with adjustable phase spacing according to claim 1, characterized in that, The adhesive used to bond the top of the first single-phase sensor to the tail of the first fuse sleeve and the tail of the third fuse sleeve is AB glue. The adhesive used to bond the top of the second single-phase sensor to the tail of the second fuse sleeve and the tail of the third fuse sleeve is AB glue.
4. The voltage transformer with adjustable phase spacing according to claim 1, characterized in that, The connection method for the B end of the first single mutual inductor to the primary insert via bolts is as follows: the primary insert has a mounting surface parallel to its axis, and a through hole is provided on the mounting surface. The bolt for detachably connecting the B end of the first single mutual inductor and the primary insert passes through the mounting surface and the spring washer in sequence and is threaded to the B end of the first single mutual inductor. The connection method for the A end of the second single mutual inductor to the primary insert via bolts is as follows: the primary insert has a mounting surface parallel to its axis, and a through hole is provided on the mounting surface. The bolt for detachably connecting the A end of the second single mutual inductor and the primary insert passes through the mounting surface and the spring washer in sequence and is threaded to the A end of the second single mutual inductor.
5. The voltage transformer with adjustable phase spacing according to claim 4, characterized in that, The connection method for the primary insert to be detachably connected to the middle part of the metal connecting piece by bolts is as follows: the bolts used to detachably connect the metal connecting piece and the primary insert pass through the flat washer, the mounting surface and the spring washer in sequence and are threaded with at least one hexagonal nut.
6. The voltage transformer with adjustable phase spacing according to claim 1, characterized in that, The bolts used for detachably connecting the B end of the first single mutual inductor and the primary insert, the bolts used for detachably connecting the A end of the second single mutual inductor and the primary insert, and the bolts used for detachably connecting the metal connecting piece and the primary insert are flat-head bolts.
7. The voltage transformer with adjustable phase spacing according to claim 1, characterized in that, The bottom surface of the base plate has a countersunk hole, and the first single mutual sensor has a threaded hole at the bottom of the second single mutual sensor. The screw passes through the countersunk hole located under the first single mutual sensor and is threadedly connected to the first single mutual sensor. The screw passes through the countersunk hole located under the second single mutual sensor and is threadedly connected to the second single mutual sensor.
8. The voltage transformer with adjustable phase spacing according to claim 7, characterized in that, The screw is a Phillips head countersunk screw.
9. The voltage transformer with adjustable phase spacing according to claim 1, characterized in that, The first fuse sleeve, the second fuse sleeve, and the third fuse sleeve are insulating fuse sleeves.
10. The voltage transformer with adjustable phase spacing according to claim 1, characterized in that, Nameplates and polarity marking plates are also attached to the first and second single mutual sensors.