Process for independent positioning of upper and lower parts of split-type current transformer
Through independent positioning and magnet fixing, the problem of insufficient mold positioning accuracy of open-close current transformers is solved, and efficient and stable current transformer production is achieved to meet the high-precision requirements of the power system.
Patent Information
- Application Number
- CN202411540984.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2044-10-31
AI Technical Summary
The existing mold positioning method for split-type current transformers has limited positioning accuracy, cumbersome operation procedures, and is prone to deviations, making it difficult to meet the high-precision requirements of power systems.
The upper and lower parts of the split-type current transformer are positioned independently using square magnets and bolts to replace the traditional screw positioning method, ensuring the insulation and centering of the body in the casting mold.
It improves production efficiency and product precision, reduces operation difficulty and labor intensity, ensures product appearance quality and performance stability, and meets the high-precision requirements of the power system.
Smart Images
Figure CN119324115B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of current transformer manufacturing, and in particular to a process for independently positioning upper and lower parts of a split-type current transformer. Background Art
[0002] In the manufacturing process of split-type current transformers, mold assembly and positioning are key steps. Previously, the most common mold assembly method employed simultaneous positioning of both the upper and lower parts. However, this approach presented numerous challenges, including limited positioning accuracy, cumbersome operational procedures, and the susceptibility to deviations. These issues significantly hindered improvements in product quality and optimized production efficiency. More critically, the limited production precision of traditional split-type current transformers made it difficult to meet the growing demands of the current power system, becoming a critical challenge that needed to be overcome in the upgrade and sustainable development of the power system. Summary of the Invention
[0003] The purpose of the present invention is to provide a process for independently positioning the upper and lower parts of a split-type current transformer during mold assembly, so as to solve the problems of transformer body damage, transformer leakage after casting, complicated procedures, low qualification rate, and long production period that are easily caused during the existing split-type current transformer mold assembly and positioning.
[0004] To achieve the above-mentioned purpose, the technical solution of the present application is: a process for independently positioning the upper and lower parts of a split-type current transformer, comprising:
[0005] Step 1: Cut the circular iron core into two semi-circular iron cores, and grind the cut edges of the iron cores to make their end faces smooth and flat;
[0006] Step 2: Insulate and wrap the semi-annular core and wind the copper wire to form the body of the split-type current transformer;
[0007] Step 3: Place a square magnet in the groove of the bottom cover of the casting mold, and use the first hexagonal bolt to fix the fixed insert of the lower part of the split current transformer to the bottom cover of the casting mold;
[0008] Step 4: Assemble the front mold of the casting mold and the bottom cover of the casting mold together;
[0009] Step 5: Use the second hexagonal bolt to fix the clamp insert of the split current transformer to the front mold and the back mold of the casting mold respectively;
[0010] Step 6: Place the body of the split-type current transformer into the front mold of the casting mold, align the body with the square magnet up and down, fix the body of the split-type current transformer with the square magnet, and then adjust the body to leave a gap between it and the clamp insert and the fixed insert to ensure that the coil of the body and the clamp insert are insulated from the ground;
[0011] Step 7: Use the third hexagonal bolt to fix the back mold of the casting mold, the bottom cover plate of the casting mold, and the front mold of the casting mold together;
[0012] The above is a method for independently positioning the lower part of the split-type current transformer. The method for independently positioning the upper part of the mold is the same as the method for independently positioning the lower part of the mold.
[0013] In one embodiment, the body of the current transformer is centered in the inner cavities of the front mold and the back mold of the casting mold by means of a fixing insert at the top and clamp inserts at both sides.
[0014] In one embodiment, in the first step, a ring-shaped core of a split-type current transformer is rolled from a Permalloy alloy with high magnetic permeability and stable performance and then subjected to a glue spraying process.
[0015] In one embodiment, the bottom cover plate of the casting mold is provided with two grooves, a square magnet is placed in each groove, and the square magnet is aligned with the end surface of the semi-annular body of the split-type current transformer for fixation.
[0016] In one embodiment, the bottom cover of the casting mold is provided with first through holes around the four sides, and first hexagonal bolts are passed through the corresponding first through holes to fix the fixing inserts of the upper and lower parts of the split-type current transformer on the bottom cover of the casting mold.
[0017] In one embodiment, a second through hole is respectively opened on the front mold and the back mold of the casting mold, and a second hexagonal head bolt is passed through the corresponding second through hole to fix the clamp insert of the open-close current transformer on the front mold and the back mold of the casting mold respectively.
[0018] In one embodiment, a third through hole is further provided on the periphery of the front mold and the back mold of the casting mold, and a third hexagonal bolt passes through the third through hole to fix the front mold and the back mold of the casting mold.
[0019] In one embodiment, both the front mold and the back mold of the casting mold are provided with outer edges extending outwards.
[0020] In one embodiment, a third through hole is opened on the outer edge of the front mold and the rear mold of the casting mold.
[0021] In one embodiment, third through holes are opened on both sides of the bottom cover plate of the casting mold, and third hexagonal head bolts pass through the third through holes of the bottom cover plate of the casting mold and the third through holes on the outer edge to fix the bottom cover plate of the casting mold, the front mold of the casting mold, and the back mold of the casting mold.
[0022] By adopting the above technical solution, the present invention can achieve the following technical effects:
[0023] 1) Due to the independent positioning of the upper and lower parts, the operation is more flexible and simple, reducing the difficulty and labor intensity of operation; the independent positioning method reduces the error accumulation caused by simultaneous positioning, improves production efficiency, and the transformers produced are of high precision to meet the growing requirements of the power system.
[0024] 2) The present invention adopts a process of independent positioning of the upper and lower parts of the transformer body, replacing the traditional top screw positioning method. It is not only easier to operate, but also eliminates multiple steps such as removing the top screw, adding materials and repairing the appearance after pouring. Therefore, while improving production efficiency, it also ensures the appearance quality of the product.
[0025] 3) This invention uses a square magnet to position the transformer coil body, ensuring uniform insulation distance within the mold. The strong magnetic force prevents tilting and shaking of the transformer body, making it more stable, thereby ensuring the transformer's performance stability and significantly improving product qualification rates.
[0026] 4) During the production process, the present invention uses a Permalloy rolled core with high magnetic permeability and stability, so that the measurement accuracy of the produced product can reach 0.5 level, ensuring the accuracy of the product measurement under wide load conditions.
[0027] 5) By setting a fixed insert on the top and equipping clamp inserts on both sides, the coil can be more intuitively ensured to be centered during the mold installation process, thereby improving the accuracy and efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0029] Figure 1 This is a front view of the mold assembly die for the split-type current transformer of the present invention;
[0030] Figure 2 This is a schematic diagram of the internal structure of the mold for the split-type current transformer of the present invention;
[0031] Figure 3 A side view of the mold assembly die and a partial schematic diagram of the internal structure of the split-type current transformer of the present invention;
[0032] Figure 4 This is a top view of the mold for the retractable current transformer of the present invention.
[0033] In the figure: 1 is the bottom cover plate of the casting mold; 2 is the front mold of the casting mold; 3 is the body of the split-type current transformer; 4 is the square magnet; 5 is the clamp insert; 6 is the second hexagonal bolt; 7 is the third hexagonal bolt; 8 is the back mold of the casting mold; 9 is the first hexagonal bolt; 10 is the fixing insert; 11 is the first through hole; 12 is the groove; 13 is the second through hole; 14 is the third through hole; 15 is the iron core. DETAILED DESCRIPTION
[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0035] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.
[0037] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0039] See also Figure 1-4 This embodiment provides a process for independently positioning the upper and lower parts of a split-type current transformer, including the following steps:
[0040] The first step is to roll the annular core 15 of the split-type current transformer with high magnetic permeability and stable performance using Permalloy and perform glue spraying. The annular core is then cut into two semi-annular cores. The core cuts are finely ground to make the end faces of the core smooth and flat.
[0041] Step 2: Insulate and wrap the semi-annular core and wind the copper wire to form the body 3 of the split-type current transformer;
[0042] Step 3: Place the square magnets 4 in the two grooves of the bottom cover 1 of the casting mold. First through holes 11 are opened around the bottom cover 1 of the casting mold. Use first hexagonal bolts 9 to pass through the corresponding first through holes 11 to fix the fixing insert 10 of the lower part of the split-type current transformer to the bottom cover 1 of the casting mold.
[0043] Step 4: Assemble the casting mold front mold 2 and the casting mold bottom cover plate 1 together;
[0044] Step 5: The front mold 2 and the back mold 8 of the casting mold are respectively provided with second through holes 13. Second hexagonal bolts 6 are passed through the corresponding second through holes 13 to fix the clamp insert 5 of the split-type current transformer to the front mold 2 and the back mold 8 of the casting mold respectively.
[0045] Step 6: Place the body 3 of the split-type current transformer into the front mold 2 of the casting mold. Align the body 3 with the square magnet 4 and fix the body 3 of the split-type current transformer with the square magnet 4. Then, adjust the body 3 to leave a gap between it and the clamp insert 5 and the fixing insert 10 to ensure that the coil of the body and the clamp insert are insulated from the ground.
[0046] Step 7: A third through hole is also opened on the outer periphery of the casting mold front mold 2 and the casting mold back mold 8, and the third hexagonal head bolt 7 passes through the third through hole to fix the casting mold front mold 2 and the casting mold back mold 8; in addition, a third through hole is opened on the outer edge of the casting mold front mold 2 and the casting mold back mold 8, and a third through hole is opened on both sides of the casting mold bottom cover plate 1, and the third hexagonal head bolt 7 passes through the third through hole of the casting mold bottom cover plate 1 and the third through hole on the outer edge to fix the casting mold bottom cover plate 1, the casting mold front mold 2, and the casting mold back mold 8.
[0047] The above is a method for independently positioning the lower part of the split-type current transformer. The method for independently positioning the upper part of the mold is the same as the method for independently positioning the lower part of the mold.
[0048] The present invention uses square magnets instead of traditional top screws to achieve the positioning of the body of the split-type zero-sequence current transformer. The operation is simple and eliminates the need for removing the top screws after casting, and then performing a series of processes such as adding materials and repairing the appearance. This ensures production efficiency while also ensuring the appearance of the product. The mold positioning accuracy of the upper and lower parts of the split-type current transformer is improved, thereby significantly improving product quality. Since the upper and lower parts are positioned independently, the operation is more flexible and simple, and the operating difficulty and labor intensity are reduced; the independent positioning method reduces the error accumulation caused by simultaneous positioning, improves production efficiency, and the transformers produced are of high precision to meet the growing requirements of the power system.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A process for independently positioning the upper and lower parts of a split-type current transformer, characterized in that: include: The first step is to cut the circular iron core (15) into two semi-circular iron cores, and finely grind the cut edges of the iron cores to make their end faces smooth and flat; Step 2: Insulate and wrap the semi-circular iron core and wind the copper wire to form the body of the split-type current transformer (3); Step 3: Place a square magnet (4) in the groove of the bottom cover plate (1) of the casting mold, and use a first hexagonal bolt (9) to fix the fixing insert (10) of the lower part of the split-type current transformer to the bottom cover plate (1) of the casting mold; Step 4: Assemble the casting mold front mold (2) and the casting mold bottom cover (1) together; Step 5: Use the second hexagonal bolt (6) to fix the clamp insert (5) of the split-type current transformer to the front mold (2) and the back mold (8) of the casting mold respectively; Step 6: Place the body (3) of the split-type current transformer into the front mold (2) of the casting mold, align the body (3) with the square magnet (4) up and down, fix the body (3) of the split-type current transformer by the square magnet (4), and then adjust the body (3) to leave a gap between it and the clamp insert (5) and the fixing insert (10) to ensure that the coil of the body and the clamp insert are insulated from the ground; Step 7: Use the third hexagonal bolt (7) to fix the casting mold back mold (8) with the casting mold bottom cover (1) and the casting mold front mold (2); The above is a method for independently positioning the lower part of the split-type current transformer. The method for independently positioning the upper part of the mold is the same as the method for independently positioning the lower part of the mold.
2. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The body (3) of the current transformer is centered in the inner cavities of the front mold (2) and the back mold (8) of the casting mold through the fixing insert (10) on the top and the clamping inserts (5) on both sides.
3. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: In the first step, a ring-shaped iron core (15) of a split-type current transformer is rolled with a Permalloy alloy having high magnetic permeability and stable performance and then subjected to a glue spraying process.
4. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The casting mold bottom cover (1) is provided with two grooves (12), each of which contains a square magnet. The square magnet is aligned with the end surface of the semi-circular body of the split-type current transformer in the vertical direction for fixation.
5. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The casting mold bottom cover (1) is provided with first through holes (11) on all sides, and first hexagonal bolts (9) are passed through the corresponding first through holes (11) to fix the fixing inserts (10) of the upper and lower parts of the split-type current transformer on the casting mold bottom cover (1).
6. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The casting mold front mold (2) and the casting mold back mold (8) are respectively provided with second through holes (13), and second hexagonal head bolts (6) are passed through the corresponding second through holes (13) to fix the clamp insert (5) of the open-close current transformer on the casting mold front mold (2) and the casting mold back mold (8).
7. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: A third through hole is also provided on the periphery of the casting mold front mold (2) and the casting mold back mold (8), and a third hexagonal head bolt (7) passes through the third through hole to fix the casting mold front mold (2) and the casting mold back mold (8).
8. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The front mold (2) and the back mold (8) of the casting mold are both provided with outer edges extending outwards.
9. The process for independently positioning the upper and lower parts of a split-type current transformer according to claim 8, characterized in that: A third through hole is formed on the outer edges of the front mold (2) and the rear mold (8) of the casting mold.
10. The process for independently positioning the upper and lower parts of a split-type current transformer according to claim 9, characterized in that: The casting mold bottom cover plate (1) has third through holes on both sides, and third hexagonal bolts (7) pass through the third through holes of the casting mold bottom cover plate (1) and the third through holes on the outer edge to fix the casting mold bottom cover plate (1), the casting mold front mold (2), and the casting mold back mold (8).