Voltage transformer

Abstract

The utility model relates to a voltage transformer which comprises a shell and an iron core, a secondary winding is wound on the iron core, a primary winding is wound outside the secondary winding, a fixing cylinder is sleeved between the primary winding and the secondary winding, the inner diameter of the fixing cylinder is defined as R, the outer diameter of the iron core is defined as r, the thickness of the secondary winding is defined as h, R, r and h are all natural numbers larger than 0, and R = r + 2 h; the iron core comprises a first iron core and a second iron core, the first iron core and the second iron core are C-shaped iron cores, and the end face of the first iron core is in butt joint with the end face of the second iron core; an insert is fixed to the top of the shell and electrically connected to the primary winding through an outgoing line of the primary winding. By means of the voltage transformer, the problems that in the prior art, the thickness of a pouring layer of a voltage transformer is not uniform, the electrical performance and mechanical strength of a product are low, die filling of the voltage transformer is difficult, the process difficulty is high, and the product is prone to breakdown in the running process can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, and particularly relates to a voltage transformer. Background Art

[0002] Voltage transformers are widely used in power systems for voltage measurement and monitoring. The core part consists of a primary winding and a secondary winding. During the production process, after the secondary winding is completed, a cloth tube is usually sleeved outside it, and then the primary winding is wound on it. After the primary winding is wound, a conductive rod needs to be installed on it to provide electrical connection and support the primary winding during the mold installation process.

[0003] In the prior art, for a voltage transformer with a conductive rod installed, due to the deviation in the size of the conductive rod, the thickness of the casting layer is uneven, which in turn affects the electrical performance and mechanical strength of the product; during the installation process of the conductive rod, the wrapping position is prone to deviation, which will affect the positioning of the primary winding, increase the difficulty of mold installation, reduce the mold installation accuracy, prolong the production working hours, and may also result in unqualified finished product quality; due to the deviation in the size or wrapping position of the conductive rod, the operator needs to spend more time adjusting and correcting during the mold installation process, increasing the process difficulty and prolonging the overall working hours; the uneven thickness of the casting layer between the primary winding and the secondary winding increases the risk of breakdown during the operation of the product, which in turn leads to product scrapping and may cause potential safety hazards in the power system.

[0004] Therefore, there are defects in the prior art and it needs to be improved and developed. Summary of the Invention

[0005] An embodiment of the utility model provides a voltage transformer, which is used to solve the problems in the prior art that for a voltage transformer with a conductive rod installed, due to the deviation in the size of the conductive rod, the thickness of the casting layer is uneven, which in turn affects the electrical performance and mechanical strength of the product; during the installation process of the conductive rod, the wrapping position is prone to deviation, which will affect the positioning of the primary winding, increase the difficulty of mold installation, reduce the mold installation accuracy, prolong the production working hours, and may also result in unqualified finished product quality; due to the deviation in the size or wrapping position of the conductive rod, the operator needs to spend more time adjusting and correcting during the mold installation process, increasing the process difficulty and prolonging the overall working hours; the uneven thickness of the casting layer between the primary winding and the secondary winding increases the risk of breakdown during the operation of the product, which in turn leads to product scrapping and may cause potential safety hazards in the power system.

[0006] An embodiment of the present utility model provides a voltage transformer, which includes a housing and an iron core. A secondary winding is wound around the iron core, and a primary winding is wound outside the secondary winding. A fixing cylinder is sleeved between the primary winding and the secondary winding. Define the inner diameter of the fixing cylinder as R, the outer diameter of the iron core as r, and the thickness of the secondary winding as h. Wherein R, r, and h are all natural numbers greater than 0, and R = r + 2h; the iron core includes a first iron core and a second iron core, and the first iron core and the second iron core are C-shaped iron cores, and the end face of the first iron core is butted against the end face of the second iron core; an insert is welded to the end of the lead-out wire of the primary winding, and the insert is fixed on the top of the housing.

[0007] Further, the fixing cylinder is an epoxy resin cylinder.

[0008] Further, a hoop is sleeved on the iron core. When the first iron core and the second iron core are butted, the inner surface of the hoop fits against the outer arc surfaces of the first iron core and the second iron core. A male buckle and a female buckle are respectively fixed at both ends of the hoop. When the male buckle is snap-connected to the female buckle, the hoop is used to clamp the first iron core and the second iron core.

[0009] Further, the hoop is a stainless steel hoop.

[0010] Further, a steel strip is sleeved on the iron core. When the first iron core and the second iron core are butted, the inner surface of the steel strip fits against the outer arc surfaces of the first iron core and the second iron core. Nuts are fixed at both ends of the steel strip. When the two ends of the steel strip approach each other, the nuts at both ends of the steel strip are threadedly connected to the same bolt.

[0011] Further, at least one nut is fixed at both ends of the steel strip. When the number of nuts at any one end of the steel strip is greater than 1, gaskets are fixed between adjacent nuts.

[0012] Further, a packing belt is wound around the iron core, and the packing belt covers the outer surface of the iron core.

[0013] Further, any one turn of the packing belt covers at least 1 / 2 of the width of the previous turn of the packing belt.

[0014] Further, the packing belt is a plastic-steel packing belt.

[0015] Beneficial effects:

[0016] As can be seen from the above technical solutions, the present utility model provides a voltage transformer, which has the following beneficial effects:

[0017] 1. Eliminate the use of conductive rods and simplify the structural design: By removing the conductive rods and directly using a fixed cylinder to sleeve the iron core and secondary winding, the number of components in the production process is reduced, and the structural design of the voltage transformer is simplified. The fixed cylinder replaces the conductive rod as the support structure, avoiding a series of problems caused by dimensional or positional deviations of the conductive rod.

[0018] 2. Improve the die-setting accuracy and process stability: Since it no longer relies on the support of the conductive rod, the die-setting process is simpler and more accurate. The use of the fixed cylinder ensures that the primary winding can be precisely wound on the secondary winding, no longer affected by the positional deviation of the conductive rod. This improvement significantly reduces the die-setting difficulty, ensuring the consistency and reliability of the product.

[0019] 3. Reduce the thickness deviation of the casting layer and improve the product quality: Since the fixed cylinder can be made of the same material as the casting material, it avoids the problem of uneven casting layer thickness that may be caused by the use of conductive rods. The casting layer is more uniform, and the electrical performance and mechanical strength of the product are significantly improved, reducing the risk of breakdown during operation.

[0020] 4. Shorten the production man-hours and improve the production efficiency: After eliminating the use of conductive rods, the die-setting process is greatly simplified, reducing the adjustment time for the size and position of the conductive rod. The improvement in automation and the simplification of the die-setting process significantly shorten the production man-hours, improve the production efficiency, and reduce the production cost.

[0021] 5. Improve the consistency and reliability of the product: By using the fixed cylinder, the quality fluctuations that may be caused by the conductive rod are avoided, and the consistency of the product is ensured. The defective rate and scrap rate are reduced, ensuring the stability and safety of the voltage transformer in actual use.

[0022] 6. Reduce the process complexity and the difficulty of quality control: The elimination of the conductive rod makes the process flow simpler, reducing the variables that need to be controlled during the production process, thereby reducing the difficulty of quality control. The workload of the operators is reduced, and the production process is more intuitive and controllable, further improving the stability of the entire production line.

[0023] 7. Enhance the compatibility of the casting materials: A fixed cylinder made of the same material as the casting material can be used, which helps to enhance the compatibility of the casting materials and avoid physical or chemical incompatibilities between the materials. This design not only improves the durability of the product but also reduces the potential risks during the production process.

[0024] In summary, the voltage transformer provided by the present utility model simplifies the production process, reduces the difficulty of quality control, significantly improves the accuracy and reliability of the product, shortens the production cycle, and improves the production efficiency by canceling the conductive rod and adopting a fixed cylinder design. These improvements effectively solve the defects in the prior art, making the voltage transformer have higher safety and stability in practical applications.

[0025] It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts do not conflict with each other.

[0026] The foregoing and other aspects, embodiments, and features of the teachings of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of exemplary embodiments, will be apparent from the following description or will be learned through the practice of specific embodiments in accordance with the teachings of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are not drawn to scale with respect to actual reference objects. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the drawings, wherein:

[0028] Figure 1 is a schematic structural diagram of a voltage transformer in an embodiment of the present application.

[0029] Figure 2 is a schematic structural diagram of a hoop sleeved on the iron core of a voltage transformer in an embodiment of the present application.

[0030] Figure 3 is a schematic structural diagram of a steel strip sleeved on the iron core of a voltage transformer in an embodiment of the present application.

[0031] Figure 4 is a schematic structural diagram of a packing tape wound around the iron core of a voltage transformer in an embodiment of the present application.

[0032] Description of Reference Numerals in the Drawings:

[0033] Primary winding 1; fixed cylinder 2; secondary winding 3; first iron core 401; second iron core 402; hoop 403; steel strip 404; packing tape 405; insert 5; housing 6. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] 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 of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present invention pertains.

[0035] The "first", "second" and similar terms used in the description of the present invention patent application and the claims do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms "a",

[0036] "one" or "the" and similar terms do not denote a limitation of quantity either, but mean that there is at least one.

[0037] The terms "comprising" or "including" and similar terms mean that the elements or items appearing before "comprising" or "including" cover the features, wholes, steps, operations, elements and / or components listed after "comprising" or "including", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0038] In the prior art, for a potential transformer equipped with a conductive rod, due to deviations in the size of the conductive rod, the thickness of the casting layer is uneven, which in turn affects the electrical performance and mechanical strength of the product; during the installation process of the conductive rod, the wrapping position is prone to deviation, which affects the positioning of the primary winding, increases the difficulty of mold installation, reduces the mold installation accuracy, prolongs the production working hours, and may also lead to unqualified finished product quality; due to deviations in the size or wrapping position of the conductive rod, operators need to spend more time adjusting and correcting during the mold installation process, increasing the process difficulty and prolonging the overall working hours; the thickness of the casting layer between the primary winding and the secondary winding is uneven, increasing the risk of breakdown during operation of the product, which in turn leads to product scrapping and may cause potential safety hazards in the power system.

[0039] In view of this, an embodiment of the present utility model provides a voltage transformer, which includes a housing 6 and an iron core. A secondary winding 3 is wound around the iron core, and a primary winding 1 is wound outside the secondary winding 3. Both the primary winding 1 and the secondary winding 3 are obtained by winding using the prior art method. A fixing cylinder 2 is sleeved between the primary winding 1 and the secondary winding 3. Define the inner diameter of the fixing cylinder 2 as R, the outer diameter of the iron core as r, and the thickness of the secondary winding 3 as h. Wherein R, r, and h are all natural numbers greater than 0, and R = r + 2h; the iron core includes a first iron core 401 and a second iron core 402. The first iron core 401 and the second iron core 402 are C-shaped iron cores, and the end face of the first iron core 401 is butted against the end face of the second iron core 402; an insert 5 is welded to the end of the primary winding 1, and the insert 5 is fixed to the top of the housing 6. By sleeving the fixing cylinder 2 between the primary winding 1 and the secondary winding 3, the stability and uniformity of the secondary winding 3 are ensured, the stress concentration between the windings is reduced, and the electrical performance and mechanical strength of the product are improved. The butt joint design of the C-shaped iron core effectively reduces the air gap during the splicing of the iron core, optimizes the continuity of the magnetic flux, and improves the efficiency and performance of the transformer. The design of the insert 5 on the top of the housing 6 makes the connection of the lead wire of the primary winding 1 more convenient, improves the assembly efficiency and simplifies the structure.

[0040] In some embodiments, the fixing cylinder 2 is an epoxy resin cylinder. Using epoxy resin as the material of the fixing cylinder 2 has good insulation and heat resistance, ensures the electrical safety of the windings during operation, and the material is light, easy to process and assemble. The fixing cylinder 2 can be made of the same material as the casting material during mold installation, achieving a fixed and stable effect. In the prior art, the distance of the casting layer between the primary winding 1 and the secondary winding 3 is reserved by supporting with a conductive rod. During casting, the casting material is allowed to enter between the primary winding 1 and the secondary winding 3 to form an insulating layer. In the embodiment of the present utility model, an epoxy resin cylinder is directly used, and the casting layer is already available in advance, so there is no need to use a conductive rod for support and the process of adjustment during mold installation, saving processes and ensuring the stability of the voltage transformer.

[0041] When using the epoxy resin cylinder, there is no need to apply semi-conductive insulating paint like a cloth cylinder, which also avoids the paint blocks on the cloth cylinder from falling off and causing breakdown.

[0042] In some embodiments, a hoop 403 is sleeved on the iron core. When the first iron core 401 and the second iron core 402 are butted, the inner surface of the hoop 403 fits against the outer arc surfaces of the first iron core 401 and the second iron core 402. A male buckle and a female buckle are respectively fixed at both ends of the hoop 403. The male buckle and the female buckle are used as snap-fastening members and can be arbitrarily distributed at both ends of the hoop 403. When the male buckle is snap-fastened to the female buckle, the hoop 403 is used to clamp the first iron core 401 and the second iron core 402. The design of the hoop 403 ensures the stability of the iron core during butt joint, prevents the iron core from shifting during transportation and assembly, and improves the overall stability and electromagnetic performance of the iron core.

[0043] In some embodiments, the hoop 403 is a stainless-steel hoop. The stainless-steel hoop has high strength and corrosion resistance, can maintain a long-term stable clamping force in a harsh environment, and increases the service life and reliability of the voltage transformer.

[0044] In some embodiments, a steel strip 404 is sleeved on the iron core. When the first iron core 401 and the second iron core 402 are butted, the inner surface of the steel strip 404 fits against the outer arc surfaces of the first iron core 401 and the second iron core 402. Nuts are fixed at both ends of the steel strip 404. When the two ends of the steel strip 404 approach each other, the nuts at both ends of the steel strip 404 are threadedly connected to the same bolt. Tightening the iron core by the steel strip 404 not only increases the stability when the iron cores are butted, but also enables fine adjustment of the iron core by adjusting the tightening force of the nuts, improves the splicing accuracy of the iron core, and enhances the electrical performance of the transformer.

[0045] In some embodiments, at least one nut is fixed at both ends of the steel strip 404. When the number of nuts at any one end of the steel strip 404 is greater than 1, a gasket is fixed between adjacent nuts. The combined design of multiple nuts and gaskets enhances the tightening force of the steel strip 404, avoids loosening of the nuts due to vibration or fatigue during long-term use, and improves the overall stability of the iron core and the reliability of long-term operation.

[0046] In some embodiments, a strapping band 405 is wound around the iron core, and the strapping band 405 covers the entire outer surface of the iron core. The design of the strapping band 405 further enhances the mechanical strength and electrical insulation performance of the iron core, prevents the influence of external force impact or vibration on the iron core structure, and improves the durability and stability of the transformer.

[0047] In some embodiments, any one turn of the strapping band 405 covers at least 1 / 2 of the width of the previous turn of the strapping band 405. The overlapping winding of the strapping band 405 increases the wrapping density and strength of the iron core, further improves the structural stability and electrical insulation performance of the iron core, and effectively avoids performance degradation caused by winding loosening.

[0048] In some embodiments, the strapping band 405 is a plastic-steel strapping band. The plastic-steel strapping band has high tensile strength and good durability, can effectively withstand the internal stress and external pressure of the iron core, prevent deformation or relaxation caused by long-term use, and extends the service life of the voltage transformer.

[0049] In summary, a voltage transformer provided by the present utility model simplifies the structural design of the voltage transformer by reducing the number of components in the production process. This is achieved by eliminating the conductive rod and directly using the fixed cylinder 2 to sleeve the iron core and the secondary winding 3. The fixed cylinder 2 replaces the conductive rod as the support structure, avoiding a series of problems caused by dimensional or positional deviations of the conductive rod. Since it no longer relies on the support of the conductive rod, the mold loading process is more convenient and accurate. The use of the fixed cylinder 2 ensures that the primary winding 1 can be precisely wound on the secondary winding 3 without being affected by the positional deviation of the conductive rod. This improvement significantly reduces the mold loading difficulty, ensuring product consistency and reliability. Since the fixed cylinder 2 can be made of the same material as the casting material, it avoids the problem of uneven casting layer thickness that may occur when using the conductive rod. The casting layer is more uniform, significantly enhancing the electrical performance and mechanical strength of the product and reducing the risk of breakdown during operation. After eliminating the use of the conductive rod, the mold loading process is greatly simplified, reducing the adjustment time for the size and position of the conductive rod. The improvement in automation and the simplification of the mold loading process significantly shorten the production time, improve production efficiency, and reduce production costs. By using the fixed cylinder 2, the quality fluctuations caused by the conductive rod are avoided, ensuring product consistency. The rejection rate and scrap rate are reduced, ensuring the stability and safety of the voltage transformer in actual use. The elimination of the conductive rod simplifies the process flow, reduces the variables to be controlled during production, and thus reduces the difficulty of quality control. The workload of the operator is reduced, and the production process is more intuitive and controllable, further enhancing the stability of the entire production line. The use of the fixed cylinder 2 made of the same material as the casting material helps to enhance the compatibility of the casting material and avoid physical or chemical incompatibility between materials. This design not only improves the durability of the product but also reduces potential risks during production. Therefore, the voltage transformer provided by the present utility model simplifies the production process, reduces the difficulty of quality control, significantly improves the accuracy and reliability of the product, shortens the production cycle, and improves production efficiency by eliminating the conductive rod and adopting the fixed cylinder 2 design. These improvements effectively solve the defects in the prior art, making the voltage transformer have higher safety and stability in practical applications.

[0050] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope defined in the claims.

Claims

1. A voltage transformer, comprising a housing and an iron core, wherein a secondary winding is wound on the iron core, and a primary winding is wound outside the secondary winding, characterized in that: A fixed tube is sleeved between the primary winding and the secondary winding, and the inner diameter of the fixed tube is defined as R, the outer diameter of the iron core is r, and the thickness of the secondary winding is h, wherein R, r and h are all natural numbers greater than 0, and R=r+2h; the iron core includes a first iron core and a second iron core, the first iron core and the second iron core are C-shaped iron cores, and the end face of the first iron core is connected to the end face of the second iron core; an insert is welded on the end of the lead wire of the primary winding, and the insert is fixed on the top of the shell.

2. A voltage transformer according to claim 1, characterized in that: The fixing tube is an epoxy resin tube.

3. A voltage transformer according to claim 2, characterized in that: A hoop is sleeved on the iron core. When the first iron core and the second iron core are butt-jointed, the inner surface of the hoop fits against the outer arc surface of the first iron core and the second iron core. A male buckle and a female buckle are fixed at both ends of the hoop respectively. When the male buckle is buckled and connected to the female buckle, the hoop is used to clamp the first iron core and the second iron core.

4. A voltage transformer according to claim 3, characterized in that: The hoop is a stainless steel hoop.

5. A voltage transformer according to claim 2, characterized in that: A steel belt is sleeved on the iron core. When the first iron core and the second iron core are butt-jointed, the inner surface of the steel belt fits against the outer arc surface of the first iron core and the second iron core. Nuts are fixed at both ends of the steel belt. When the two ends of the steel belt are close to each other, the nuts at both ends of the steel belt are threadedly connected to the same bolt.

6. A voltage transformer according to claim 5, characterized in that: At least one nut is fixed to both ends of the steel strip. When the number of nuts at any end of the steel strip is greater than 1, a gasket is fixed between adjacent nuts.

7. A voltage transformer according to claim 2, characterized in that: A packing tape is wound around the iron core, and the packing tape completely covers the outer surface of the iron core.

8. A voltage transformer according to claim 7, characterized in that: Any circle of the strapping tape at least covers 1 / 2 of the width of the previous circle of the strapping tape.

9. A voltage transformer according to claim 8, characterized in that: The strapping tape is a plastic-steel strapping tape.

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