Multi-tapping-section mixed-winding-direction transformer winding
By using a multi-tap hybrid winding design and an insulating plastic cover for protection, the problem of discharge faults caused by large potential differences in the high-voltage winding taps is solved, thus improving the safety and reliability of power transformers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-04-03
AI Technical Summary
Traditional high-voltage winding breakout points have large potential differences, making them prone to discharge faults under lightning strikes, which can affect the safe operation of the power system.
It adopts a multi-segment hybrid winding design, with the normal segment and the segment winding in opposite directions. Combined with an insulating plastic cover to protect the conductor, it reduces the voltage during power outages and prevents damage from dust, moisture and small animals.
Under lightning strikes, the potential difference at the break point of the tap section is reduced by half, improving the safety and reliability of the equipment, avoiding discharge faults, and protecting the conductors from damage.
Smart Images
Figure CN121790147A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of winding technology, specifically to a transformer winding with multiple taps and mixed winding directions. Background Technology
[0002] For high-voltage power transformers, when the high-voltage winding is equipped with a tap section, the winding direction of the normal section and the tap section of the high-voltage winding are usually the same. When the tap changer is at the minimum tap, the potential difference at the interruption point of the tap section is large because the direction of the induced electromotive force is opposite. Under the action of lightning strike, the potential difference at the interruption point of the tap section will increase sharply. If the insulation is not properly handled, a discharge fault is likely to occur, which poses a hidden danger to the safe operation of the power system.
[0003] Patent document CN217507068U discloses a transformer winding structure, which includes "a core mounting base, on which an iron core is fixedly mounted, a heat dissipation assembly mounted on the core mounting base, multiple epoxy tubes sleeved on the iron core, multiple coil windings wound around the circumference of the epoxy tubes, and an insulating support bar between two adjacent coil windings in the vertical direction, the insulating support bar being connected to the iron core; this invention improves the support strength when the winding conductor deforms inward, can withstand the coil deformation caused by the inward shrinkage force during a short circuit, and at the same time makes the transformer more stable in complex environments, greatly improving the product reliability of the transformer, and has the characteristics of strong heat dissipation."
[0004] However, the transformer winding structure in the aforementioned published documents mainly considers significantly improving the product reliability of the transformer and has the characteristics of strong heat dissipation, but it is not convenient to reduce the voltage during power outages and improve safety.
[0005] In view of this, it is necessary to develop a voltage reduction mechanism to reduce the voltage during power outages and improve safety. Summary of the Invention
[0006] The purpose of this invention is to provide a transformer winding with multiple taps and mixed winding directions, in order to solve the technical problem mentioned in the background art of large potential difference at the interruption point of the taps in traditional high-voltage windings.
[0007] To achieve the above objectives, the present invention provides the following technical solution: a transformer winding with multiple taps and mixed winding directions, comprising: a support, a winding shaft and conductors, wherein the outer wall of the winding shaft is provided with a voltage reduction mechanism, the voltage reduction mechanism being used to reduce the voltage during power outages and improve safety; The step-down mechanism includes a bottom transposition and a second outlet of the opposite tap. The conductor includes a normal section body, a tap with the same normal section winding direction, and a tap with the opposite normal section winding direction. The outer wall of the normal section body is provided with an outlet body. The outer wall of the tap with the opposite normal section winding direction is provided with a first outlet of the opposite tap. The outer wall of the tap with the opposite normal section winding direction is provided with a second outlet of the opposite tap. The outer wall of the normal section body is provided with a second outlet body. The outer wall of the tap with the same normal section winding direction is provided with a second outlet of the same direction tap. The bottom of the conductor is provided with a bottom transposition and an outer transposition. The outer wall of the tap with the same normal section winding direction is provided with a first outlet of the same direction tap.
[0008] Preferably, a connecting plate is installed on the outer wall of the bracket, a winding shaft is installed on the inner wall of the bracket, and a wire is arranged around the outer wall of the winding shaft.
[0009] Preferably, the outer wall of the winding shaft is provided with a protective mechanism, which is used to protect the tap points of the conductors to prevent dust and moisture from reducing the insulation strength and small animals (such as mice) from biting and causing short circuits.
[0010] Preferably, the protective mechanism includes an insulating plastic cover, and the outer wall of the winding shaft is provided with an insulating plastic cover.
[0011] Preferably, the outer wall of the insulating plastic cover is fitted with an mounting plate.
[0012] Preferably, the outer wall of the mounting plate is fitted with mounting screws.
[0013] Preferably, the inner wall of the bracket is provided with a mounting screw groove, and one end of the mounting screw extends into the interior of the mounting screw groove.
[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention reduces the voltage during power outages and improves safety by installing a voltage-reducing mechanism. For high-voltage power transformers, when the high-voltage winding has tap sections, the winding direction of the normal section and the tap section is usually the same. When the tap changer is at its minimum tap, the potential difference at the tap section interruption point is large due to the opposite direction of the induced electromotive force. Under the action of lightning strikes, the potential difference at the tap section interruption point will increase sharply. If the insulation is not properly handled, a discharge fault can easily occur, posing a hidden danger to the safe operation of the power system. Therefore, this invention improves upon this by having the normal section body wound to the left, and the tap section with the same winding direction as the normal section also having a left winding direction. The winding direction of the tap section is opposite to that of the normal section, which is the right winding direction. The first outlet body of the normal section body is connected to the outlet body of the opposite tap section of the normal section with the outlet body of the tap section with the same winding direction as the normal section with the same winding direction as the normal section with the outlet body of the tap section with the opposite winding direction of the normal section with the outlet body of the tap section with the opposite winding direction of the normal section with the outlet body of the tap section with the opposite winding direction of the normal section with the outlet body of the tap section with the opposite winding direction is led out separately. Since the winding directions of the two tap sections are opposite, according to the principle of electromagnetic induction, the induced electromotive force of the winding sections with different winding directions is opposite. Compared with the design scheme with the same winding direction, the potential difference at the tap section interruption point is reduced by half at the minimum tap, which greatly improves the safety and reliability of the equipment. 2. This invention protects the junction points of the conductors by installing a protective mechanism, preventing dust and moisture from reducing insulation strength and small animals such as mice from causing short circuits. Existing systems allow external dust and moisture to corrode the conductors, and small animals can also damage them. Therefore, this invention needs improvement. First, after the conductors are wound, two sets of insulating plastic covers are wrapped around the outside of the winding shaft. Then, mounting screws are used to fix them into the mounting screw slots. The mounting plate is then connected to the bracket. Two sets of insulating plastic covers protect a single winding shaft. If there is a wire connection, holes are drilled in the insulating plastic covers as needed, allowing the wire to pass through without affecting the connection, thus providing better protection for the winding. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the front structure of the winding of the present invention; Figure 2 This is a schematic diagram of the winding circuit structure of the present invention; Figure 3 This is a schematic diagram of the wiring structure of the present invention; Figure 4 This is a schematic diagram of the winding side structure of the present invention.
[0016] In the diagram: 1. Normal section body; 2. Normal section with the same winding direction; 3. Normal section with the opposite winding direction; 4. Conductor; 5. Outlet 1 body; 6. Bottom transposition; 7. External transposition; 8. Outlet 1 of the opposite tap section; 9. Outlet 1 of the same-direction tap section; 10. Outlet 2 of the same-direction tap section; 11. Outlet 2 body; 12. Outlet 2 of the opposite tap section; 13. Bracket; 14. Winding shaft; 15. Connecting plate; 16. Insulating plastic cover; 17. Mounting plate; 18. Mounting screw; 19. Mounting screw groove. Detailed Implementation
[0017] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0020] Please see Figure 1 , Figure 2 and Figure 3A transformer winding with multiple taps and mixed winding directions includes: a support 13, a winding shaft 14, and a conductor 4. The outer wall of the winding shaft 14 is provided with a voltage-reducing mechanism to lower the voltage during power outages and improve safety. The voltage-reducing mechanism includes a bottom transposition 6 and a second outlet 12 of the opposite tap. The conductor 4 includes a normal section body 1, a tap 2 with the same normal winding direction, and a tap 3 with the opposite normal winding direction. The outer wall of the normal section body 1 is provided with an outlet body 5. The outer wall of the tap 3 with the opposite normal winding direction is provided with a first outlet 8 and a second outlet 12. The outer wall of the normal section body 1 is provided with a second outlet body 11, and the outer wall of the tap 2 with the same normal winding direction is provided with a second outlet 12. A tap changer 10 extends to the tap section. The bottom of the conductor 4 is equipped with a bottom transposition 6 and an external transposition 7. The outer wall of the tap section 2, with the same winding direction as the normal section, is equipped with a tap changer 9 in the same direction. A connecting plate 15 is installed on the outer wall of the bracket 13, and a winding shaft 14 is installed on the inner wall of the bracket 13. The conductor 4 is arranged around the outer wall of the winding shaft 14. For high-voltage power transformers, when a tap section is set in the high-voltage winding, the winding direction of the normal section and the tap section is usually the same. When the tap changer is at its minimum tap, due to the opposite direction of the induced electromotive force, the potential difference at the tap section interruption point is large. Under the action of lightning strikes, the potential difference at the tap section interruption point will increase sharply. If the insulation treatment is not good, a discharge fault is likely to occur, posing a hidden danger to the safe operation of the power system. To improve this, the normal section body 1 is wound to the left. The branch section 2, with the same winding direction as the normal section, is also wound to the left. The branch section 3, with the opposite winding direction, is wound to the right. The first branch body 5 of the normal section body 1 is connected to the opposite branch section 8 of the branch section 3. The second branch body 11 of the normal section body 1 is connected to the same branch section 10 of the branch section 2 with the same winding direction. The opposite branch section 12 of the branch section 3 is led out separately. Because the two branch sections have opposite winding directions, according to the principle of electromagnetic induction, the induced electromotive force of winding sections with different winding directions is in opposite directions. This design is similar to the design with the same winding direction. Compared to the previous method, the potential difference at the break point of the tap section is reduced by half at the minimum tap, greatly improving the safety and reliability of the equipment. Tap section 2, with the same winding direction as the normal section, and tap section 3, with the opposite winding direction, constitute two tap sections. In practical applications, more than two tap sections can be set according to the tap range and voltage regulation level requirements. To put it simply: In existing technology, when a high-voltage transformer needs to adjust the voltage (e.g., from 110kV to 105kV), the windings must be divided into a "normal section" (mainly used for power transmission) and a "tap section" (the section used for voltage regulation). Traditionally, the tap section and the normal section have the same winding direction (e.g., both clockwise). However, this has a major problem—when the voltage is adjusted to the "minimum level" (e.g., the lowest voltage level),...A significant voltage difference can occur at the "break point" between tap sections (the connection between the tap section and the normal section). When lightning strikes the line or induces a high voltage, this "high voltage difference" acts like a "fuse," easily causing sparking and discharge at the break point (similar to how excessive voltage between a plug and socket causes sparks). This can directly damage the transformer and even affect power grid safety. The innovative approach involves dividing the tap sections into two types: one with the same winding direction as the normal section, and the other with the opposite winding direction (e.g., the normal section is wound clockwise, one tap is clockwise, and the other counterclockwise). According to the principle of electromagnetic induction, opposite winding directions result in opposite induced voltage directions (e.g., a clockwise winding induces a "+" voltage, while a counterclockwise winding induces a "-" voltage). Therefore, when the voltage is adjusted to the "minimum setting," the voltages of the two tap sections will "partially cancel each other out," directly halving the voltage difference at the break point. With a smaller voltage difference, sparking and discharge under lightning strikes is less likely—essentially halving the "firepower" of the "fuse," making it much safer.
[0021] Please see Figure 1 and Figure 4 A transformer winding with multiple taps and mixed winding directions is provided. The outer wall of the winding shaft 14 is provided with a protective mechanism to protect the taps of the conductor 4, preventing dust and moisture from reducing the insulation strength and small animals such as mice from biting and causing short circuits. The protective mechanism includes an insulating plastic cover 16. The outer wall of the winding shaft 14 is provided with an insulating plastic cover 16. An mounting plate 17 is installed on the outer wall of the insulating plastic cover 16. An mounting screw 18 is installed on the outer wall of the mounting plate 17. The inner wall of the bracket 13 is provided with a mounting screw groove 19, and one end of the mounting screw 18 extends into the interior of the mounting screw groove 19. In existing transformers, because the conductor 4 is wrapped around the winding shaft 14, the conductor 4 is not directly connected to the transformer winding shaft 14. On the winding shaft 14, external dust and moisture can corrode the wire 4, and small animals can also damage the wire 4. Therefore, this needs to be improved. First, after the wire 4 is wound, two sets of insulating plastic covers 16 are wrapped around the outside of the winding shaft 14. Then, the mounting screws 18 are used to fix it into the mounting screw grooves 19. Then, the mounting plate 17 is connected to the bracket 13. The two sets of insulating plastic covers 16 are used to protect a single winding shaft 14. If there is a wire connection, holes are drilled in the insulating plastic covers 16 as needed so that the wire can pass through the holes without affecting the connection of the wire, thereby better protecting the winding.
[0022] Working principle: For high-voltage power transformers, when tap sections are set in the high-voltage winding, the winding direction of the normal section and the tap section of the high-voltage winding are usually the same. When the tap changer is at its minimum tap, due to the opposite direction of the induced electromotive force, the potential difference at the tap section interruption point is large. Under the action of lightning strikes, the potential difference at the tap section interruption point will increase sharply. If the insulation is not properly handled, a discharge fault can easily occur, posing a hidden danger to the safe operation of the power system. Therefore, this is improved. The normal section body 1 is wound to the left. The tap section 2, which has the same winding direction as the normal section, is wound to the left. The tap section 3, which has the opposite winding direction of the normal section, is wound to the right. The normal section body 1 includes an outlet body 5, which is opposite to the tap section 3. 8. The normal section body 1 includes a second tap 11, which is connected to the tap 2 tap 10, which is in the same direction as the normal section winding direction. The opposite tap 12 of the tap 3 is led out separately. Since the two taps have opposite winding directions, according to the principle of electromagnetic induction, the induced electromotive force of winding sections with different winding directions is opposite. Compared with the design scheme with the same winding direction, the potential difference at the tap break point is reduced by half at the minimum tap, which greatly improves the safety and reliability of the equipment. The normal section with the same winding direction 2 and the normal section with the opposite winding direction 3 are two taps. In actual application, more than two taps can be set according to the tap range and voltage regulation level requirements. In layman's terms: Existing technology: High voltage To adjust the voltage of a transformer (e.g., from 110kV to 105kV), the windings must be divided into a "normal section" (the part mainly used for power transmission) and a "tap section" (the section used for voltage adjustment). Traditionally, the tap section and the normal section have the same winding direction (e.g., both clockwise). However, this presents a major problem—when adjusting to the "lowest setting" (e.g., the lowest voltage setting), a large voltage difference will appear at the "break point" between the tap sections (the connection between the tap section and the normal section). When lightning strikes the line or induces high voltage, this "high voltage difference" will act like a "fuse," easily causing sparking and discharge at the break point (similar to how high voltage between a plug and socket can cause sparks), directly damaging the transformer and even affecting power grid safety. (Innovation Department) The tap section is divided into two types: one with the same winding direction as the normal section, and the other with the opposite winding direction (e.g., the normal section is wound clockwise, one tap section is clockwise, and the other is counterclockwise). According to the principle of electromagnetic induction, the induced voltage direction is also opposite when the winding direction is opposite (e.g., the induced voltage of the clockwise winding section is "+", and the counterclockwise winding section is "-"). In this way, when the voltage is adjusted to the "minimum level", the voltage of the two tap sections will "partially cancel each other out", and the voltage difference at the break point is directly reduced by half. With a smaller voltage difference, it is not easy to spark and discharge under lightning strikes—it is equivalent to reducing the "firepower" of the "fuse" by half, making it much safer. In the existing system, because the conductor 4 is wound around the winding shaft 14, external dust and moisture can corrode the conductor 4.Meanwhile, small animals can also damage wire 4, so improvements are needed. First, after wire 4 is wound, two sets of insulating plastic covers 16 are wrapped around the outside of the winding shaft 14, and then fixed into the mounting screw groove 19 using mounting screws 18. Then, the mounting plate 17 is connected to the bracket 13. The two sets of insulating plastic covers 16 then protect a single winding shaft 14. If there is a wire connection, holes are drilled in the insulating plastic covers 16 as needed, allowing the wire to pass through the holes without affecting the connection, thus better protecting the winding.
[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A transformer winding with multiple taps and mixed winding directions, characterized in that, include: The bracket (13), winding shaft (14) and wire (4) are provided. The outer wall of the winding shaft (14) is provided with a voltage reduction mechanism, which is used to reduce the voltage during power failure and improve safety. The step-down mechanism includes a bottom transposition (6) and a second outlet of the opposite tap section (12). The conductor (4) includes a normal section body (1), a tap section (2) with the same normal section winding direction, and a tap section (3) with the opposite normal section winding direction. The outer wall of the normal section body (1) is provided with an outlet body (5). The outer wall of the tap section (3) with the opposite normal section winding direction is provided with a first outlet of the opposite tap section (8). The outer wall of the tap section (3) with the opposite normal section winding direction is provided with a second outlet of the opposite tap section (12). The outer wall of the normal section body (1) is provided with a second outlet body (11). The outer wall of the tap section (2) with the same normal section winding direction is provided with a second outlet of the same direction tap section (10). The bottom of the conductor (4) is provided with a bottom transposition (6) and an outer transposition (7). The outer wall of the tap section (2) with the same normal section winding direction is provided with a first outlet of the same direction tap section (9).
2. A transformer winding with multiple taps and mixed winding directions according to claim 1, characterized in that: A connecting plate (15) is installed on the outer wall of the bracket (13), and a winding shaft (14) is installed on the inner wall of the bracket (13). A wire (4) is arranged around the outer wall of the winding shaft (14).
3. A transformer winding with multiple taps and mixed winding directions according to claim 2, characterized in that: The outer wall of the winding shaft (14) is provided with a protective mechanism, which is used to protect the tap point of the conductor (4).
4. A transformer winding with multiple taps and mixed winding directions according to claim 3, characterized in that: The protective mechanism includes an insulating plastic cover (16), and the outer wall of the winding shaft (14) is provided with an insulating plastic cover (16).
5. A transformer winding with multiple taps and mixed winding directions according to claim 4, characterized in that: An mounting plate (17) is installed on the outer wall of the insulating plastic cover (16).
6. A transformer winding with multiple taps and mixed winding directions according to claim 5, characterized in that: The mounting plate (17) has mounting screws (18) installed on its outer wall.
7. A transformer winding with multiple taps and mixed winding directions according to claim 6, characterized in that: The inner wall of the bracket (13) is provided with a mounting screw groove (19), and one end of the mounting screw (18) extends into the interior of the mounting screw groove (19).
Citation Information
Patent Citations
Transformer winding structure
CN217507068U