A no-load transformer voltage step regulator
By designing a voltage range regulator without excitation transformer, problems such as difficult maintenance, poor contact, and large size are solved, achieving reliable contact, easy maintenance, and space saving.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN ZHIGANG ELECTRIC CO LTD
- Filing Date
- 2025-06-20
- Publication Date
- 2026-06-23
AI Technical Summary
The existing tap changer structure of power transformers leads to difficulties in inspection and maintenance, poor contact between contacts, easy misoperation, and large size, which affects the normal operation of transformers and increases costs.
Design a voltage range adjuster for a non-excitation transformer. It adopts a structure of base, sealing plug and sealing cover, and a combination of conductive rod and range connecting plate. Combined with the use of insulating fluid, it ensures good contact and easy maintenance. The sealing design avoids misoperation and space occupation.
It ensures that no matter how many times it is adjusted, there will be no poor contact, which facilitates maintenance and testing, avoids misoperation, and does not occupy the space of the oil tank or air tank, thus improving the equipment's durability and ease of maintenance.
Smart Images
Figure CN224400191U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power transformers, and in particular to a voltage level regulator for a non-excitation transformer. Background Technology
[0002] Currently, conventional oil-immersed and gas-insulated power transformers on the market generally use disc-type or strip-type non-excitation tap changers to adjust the voltage level. A common feature of these tap changers is that the contacts and transmission mechanism are sealed inside an oil tank or gas tank, and the voltage level is adjusted by rotating an operating handle outside the tank. However, this type of tap changer has revealed several shortcomings in practical applications.
[0003] Firstly, inspection and maintenance are difficult. Because the contacts and transmission mechanism of the tap changer are sealed inside the oil tank or gas tank, maintenance personnel cannot directly inspect and test them from the outside of the transformer, making regular inspection and maintenance very difficult.
[0004] Secondly, poor contact. Tap changer contacts are generally clip-on or wedge-shaped. To reduce wear between contacts and facilitate sliding or rotating of the moving contact, the contact area and clamping force between the moving and stationary contacts are relatively small, resulting in relatively high contact resistance. Furthermore, with increased operation frequency, contact wear and poor contact often occur, leading to excessive resistance imbalance in the transformer windings and affecting the normal operation of the transformer.
[0005] Thirdly, it is prone to misoperation. Because the tap changer's operating handle can be operated without any tools, it is easy to misoperate during maintenance and repair.
[0006] Fourthly, the size is large. The contacts of tap changers are generally arranged in a planar manner. The diameter of the panel or the length of the bracket increases significantly with the increase in the number of taps and the increase in voltage level, which occupies more space in the oil tank or gas tank, resulting in a larger oil tank or gas tank and increased cost. Utility Model Content
[0007] The technical problem to be solved by this utility model is to provide a voltage level regulator without excitation transformer that is not prone to misoperation, can avoid poor contact, is easy to inspect and maintain, and is small in size.
[0008] To solve the above-mentioned technical problems, this utility model provides a voltage level adjuster for a non-excitation transformer, including a base, a sealing plug, and a sealing cover. The base contains several conductive rods and several level connecting pieces. The bottom ends of the conductive rods axially penetrate the base and extend outwards. Each conductive rod has a terminal at both ends. The level connecting pieces are located at the top of the base and have a first fixing hole and a second fixing hole. The first fixing hole connects to the terminal at the top of one conductive rod, and the second fixing hole connects to the terminal at the top of the other conductive rod. The sealing plug is inserted into the base. The sealing plug has an injection channel for injecting insulating liquid. The sealing cover is located at the top of the base and covers the sealing plug.
[0009] As an improvement to the above solution, the seat body is surrounded by a first flange, the bottom of the first flange is provided with a first annular groove, and a first washer is provided in the first annular groove; the top of the seat body is provided with a first columnar channel, and the periphery of the first columnar channel is provided with a first thread; the outer wall of the middle part of the seat body is provided with an annular groove group; and the inner wall of the bottom of the seat body is provided with an annular boss.
[0010] As an improvement to the above solution, the seat body is provided with a partition boss, the partition boss includes a base column and at least two partition plates extending outward from the base column as the center, and a guide boss is also provided on one side of the partition plate.
[0011] As an improvement to the above solution, the sealing plug includes an insulating handle, a connecting post, and a second flange. The insulating handle is located at the top of the sealing plug, the connecting post is located in the middle of the sealing plug, and the second flange is located at the bottom of the sealing plug. The diameter of the second flange is larger than that of the insulating handle, and the diameter of the insulating handle is larger than that of the connecting post.
[0012] As an improvement to the above solution, the outer wall of the second flange is provided with a second annular groove, and a second gasket is provided in the second annular groove.
[0013] As an improvement to the above solution, the injection channel includes a first injection channel and a second injection channel, the first injection channel is located at the top of the second injection channel, and the diameter of the first injection channel is smaller than the diameter of the second injection channel.
[0014] As an improvement to the above solution, the bottom of the sealing cover is provided with a twist cover, and the outer periphery of the twist cover is provided with several vertical reinforcing ribs.
[0015] As an improvement to the above solution, the bottom of the sealing cover is provided with a first columnar groove and a second columnar groove, the first columnar groove is located at the top of the second columnar groove, and the outer periphery of the second columnar groove is provided with a second thread.
[0016] As an improvement to the above solution, a third washer is provided at the top of the second columnar groove.
[0017] As an improvement to the above solution, the gear connecting piece is provided with a first fixing hole and a second fixing hole at both ends.
[0018] The beneficial effects of implementing this utility model are as follows:
[0019] In this invention, by using a gear-positioning connecting piece to connect the terminals, the no-excitation transformer will not experience poor contact regardless of how many adjustments are made. Furthermore, since the terminals penetrate the base and extend beyond it, maintenance personnel can easily inspect and test them. The gear-positioning connecting piece has a first fixing hole and a second fixing hole, which firmly secure the terminals, effectively preventing misoperation during maintenance. Because the gear-positioning connecting piece is located at the top of the base, it is no longer a planar arrangement, and it will not occupy space in the oil tank or gas tank, regardless of the number of gears required.
[0020] In addition, by setting a sealing plug, the top of the base can be completely sealed, leaving only the injection channel open to the outside, so as to ensure that the insulating liquid can be smoothly added into the base so that the insulating liquid can soak the terminals on the top of the base.
[0021] Furthermore, by installing a sealing cap, the top of the injection channel can also be covered to prevent debris from entering the injection channel. Attached Figure Description
[0022] Figure 1 This is an exploded view of the voltage range adjuster for the non-excitation transformer of this utility model;
[0023] Figure 2 This is a top view of the base of the voltage range adjuster for the non-excitation transformer of this utility model;
[0024] Figure 3 This is a schematic diagram of the range connection piece structure of the voltage range adjuster for the non-excitation transformer of this utility model;
[0025] Figure 4 This is a sectional view of the base of the voltage range adjuster for the non-excitation transformer of this utility model;
[0026] Figure 5 This is a cross-sectional view of the sealing plug of the voltage range adjuster for the non-excitation transformer of this utility model;
[0027] Figure 6 This is a schematic diagram of the sealing cover structure of the voltage range adjuster for the non-excitation transformer of this utility model;
[0028] Figure 7This is a cross-sectional view of the sealing cover of the voltage range adjuster for the non-excitation transformer of this utility model. Detailed Implementation
[0029] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.
[0030] See Figure 1 Figure 5 , Figure 1 Figure 5 The present invention discloses the specific structure of the voltage range adjuster for a non-excitation transformer, including a base 1, a sealing plug 2, and a sealing cover 3. The base 1 contains several conductive rods 11 and several range connecting pieces 12. The bottom ends of the conductive rods 11 axially penetrate the base 1 and extend outside the base 1. Both ends of the conductive rods 11 are provided with terminals 111. The range connecting pieces 12 are located at the top of the base 1 and have a first fixing hole 121 and a second fixing hole 122. The first fixing hole 121 connects to the terminal 111 at the top of one of the conductive rods 11, and the second fixing hole 122 connects to the terminal 111 at the top of the other conductive rod 11. The sealing plug 2 is inserted into the base 1. The sealing plug 2 has an injection channel 21 for injecting insulating liquid. The sealing cover 3 is located at the top of the base 1 and is used to cover the sealing plug 2.
[0031] It should be noted that by designing the conductive rod 11 to axially penetrate the base 1 and extend beyond it, maintenance personnel can easily inspect and test it. Since the stop connecting piece 12 has a first fixing hole 121 and a second fixing hole 122, the two fixing holes can firmly fix the terminal block 111. Maintenance personnel need to use tools to adjust the position of the stop connecting piece 12, thus effectively preventing misoperation during maintenance. The sealing plug 2 completely seals the top of the base 1, leaving only the injection channel 21 open to the outside, ensuring that insulating fluid can be smoothly added into the base 1 and soak the terminal block 111 at the top of the base 1. The injection channel 21 can also be used for venting and depressurization, facilitating the insertion of the sealing plug 2 into the base 1. Furthermore, the sealing cover 3 covers the top of the sealing plug 2 to prevent debris from falling into the injection channel 21.
[0032] Specifically, by using the gear connecting piece 12 to connect the terminal 111, the voltage gear adjuster of the non-excitation transformer will not have poor contact no matter how many times it is adjusted. Since the gear connecting piece 12 is located on the top of the base 1 and is no longer arranged in a plane, it will not occupy the space of the oil tank or gas tank no matter how many gears are required.
[0033] In this embodiment, a total of eighteen conductive rods 11 are provided, divided into three groups of six. By connecting two conductive rods 11 together to form one gear position, the voltage gear adjuster of the non-excitation transformer is configured with five adjustable gear positions. By using gear connecting pieces 12 to combine different conductive rods 11 in pairs, the switching between the five different gear positions can be achieved. In this embodiment, all conductive rods 11 are copper tubes. Other materials with good conductivity can achieve the same effect, so this is not a limitation.
[0034] See Figure 2 The base body 1 is surrounded by a first flange 13. The bottom of the first flange 13 has a first annular groove 131, and a first washer 131a is placed inside the first annular groove 131. The top of the base body 1 has a first columnar channel 14, and the periphery of the first columnar channel 14 has a first thread. By designing a flange around the base body 1, this non-excitation transformer voltage level adjuster can be easily connected to other parts. By providing an annular groove at the bottom of the first flange 13 and using the first washer 131a, the gap between the first flange 13 and the base body 1 is filled with the first washer 131a, increasing the friction between the first flange 13 and the base body 1 and preventing slippage.
[0035] It should be noted that in this embodiment, the first gasket 131a is a rubber gasket. Other materials with strong elasticity and good sealing performance can also achieve the same effect, so this is not a limitation.
[0036] The space between the first columnar channel 14 and the top of the base 1 is used to store insulating liquid so that the terminal 111 at one end of the conductive rod 11 can be immersed in the insulating liquid to prevent leakage.
[0037] See Figure 4 The outer wall of the middle part of the base 1 is provided with an annular groove group 15, and the inner wall of the bottom of the base 1 is provided with an annular boss 16. Both the annular groove group 15 and the annular boss 16 are used to increase the creepage distance of the voltage range adjuster of the non-excitation transformer of this utility model. This is to avoid the generation of surface arcs under high voltage environments, thereby improving the equipment's tolerance to transient overvoltages.
[0038] Preferably, the seat body 1 is provided with a partition boss 17, which includes a base column 171 and at least two partition plates 172 extending outward from the base column 171. A guide boss 18 is also provided on one side of each partition plate 172. In this embodiment, a total of three partition plates 172 are provided, dividing the cross-section of the cylinder into three equal parts, thus dividing the conductive rods 11 within the seat body 1 into three equal groups. The guide boss 18 is used to guide the gear connecting plate.
[0039] It should be noted that the number of partition plates 172 can be adjusted according to the actual number of conductive rods 11. In this embodiment, using three partition plates 172 is optimal.
[0040] See Figure 5 The sealing plug 2 includes an insulating handle 22, a connecting post 23, and a second flange 24. The insulating handle 22 is located at the top of the sealing plug 2, the connecting post 23 is located in the middle of the sealing plug 2, and the second flange 24 is located at the bottom of the sealing plug 2. The diameter of the second flange 24 is larger than that of the insulating handle 22, and the diameter of the insulating handle 22 is larger than that of the connecting post 23. Using the insulating handle 22, maintenance personnel can easily and safely remove the sealing plug 2 when they need to inspect the equipment. By setting the diameter of the second flange 24 to be larger than the diameter of the insulating handle 22, and by designing the diameter of the insulating handle 22 to be larger than that of the connecting post 23, maintenance personnel can still reach their fingers to the bottom of the sealing cover 3 and pull it out even when the sealing plug 2 is inserted to a considerable depth into the seat 1.
[0041] Specifically, the outer wall of the second flange 24 is provided with a second annular groove 241, and a second gasket 241a is provided inside the second annular groove 241. By setting the second flange 24, the weight of the sealing plug 2 is mainly concentrated in its lower part, so that it can naturally move downward with gravity to achieve a better sealing effect.
[0042] It should be noted that the second washer 241a is made of rubber, which allows the sealing plug and the seat to have strong friction without wear. Other materials with softer texture and strong friction can also be used as the material for the second washer 241a, but this is not a limitation.
[0043] See Figure 5 The injection channel 21 includes a first injection channel 211 and a second injection channel 212. The first injection channel 211 is located at the top of the second injection channel 212, and the diameter of the first injection channel 211 is smaller than the diameter of the second injection channel 212. Because the diameters of the first injection channel 211 and the second injection channel 212 are significantly different, maintenance personnel can clearly feel the change in the rising speed of the insulating fluid during the addition of insulating fluid, and thus stop the injection of insulating fluid in time.
[0044] See Figure 6 The sealing cap 3 has a twist cap 31 at its bottom, and several vertical reinforcing ribs 32 around the twist cap 31. The sealing cap 3 is used to cover the first injection channel 21 at the top of the sealing plug 2 to prevent debris from falling into the first injection channel 211. The vertical reinforcing ribs 32 are used to increase the friction between the maintenance personnel's hands and the sealing cap 3, so that the maintenance personnel can easily twist the twist cap 31 to open the sealing cap 3.
[0045] See Figure 7The sealing cover 3 has a first columnar groove 33 and a second columnar groove 34 at its bottom. The first columnar groove 33 is located at the top of the second columnar groove 34, and the second columnar groove 34 has a second thread 341 around its periphery. By designing the first columnar groove 33, the handle can be housed inside it. By designing the second columnar groove 34, the second flange 24 and the connecting post 23 can be housed inside it. By providing the second thread 341 in the second columnar groove 34, it can match the first thread 141 around the first columnar channel 14, so that the sealing cover 3 can be fixed to the top of the base 1 by a knob.
[0046] Furthermore, a third washer 342 is provided at the top of the second columnar groove 34. The third washer 342 is used to prevent the top of the second annular groove 241 from contacting the second flange 24, thus preventing wear caused by contact between the two.
[0047] As can be seen from the above, the voltage level adjuster for a non-excitation transformer of this utility model integrates all components into one unit by setting up a base 1, a sealing plug 2, and a sealing cover 3, which facilitates maintenance work. By using the level connecting piece 12 to connect the terminals 111 at both ends of the conductive rod 11 inside the base 1, maintenance personnel do not need to use tools to adjust the position of the level connecting piece 12, which can effectively avoid misoperation by maintenance personnel during the maintenance process. Since the level connecting piece 12 is located at the bottom of the base 1, it does not occupy the space of the oil tank or gas tank. By setting a first flange 13 on the periphery of the base 1, the voltage level adjuster for a non-excitation transformer can be connected to other components by screws and bolts. By setting an annular groove group 15 on the outer wall of the middle part of the base 1 and an annular boss 16 on the inner wall of the bottom of the base 1, the creepage distance of the voltage level adjuster for a non-excitation transformer is increased, thereby improving the equipment's tolerance to instantaneous overvoltage. By providing a dividing boss 17 inside the base 1, the conductive rods 11 inside the base 1 can be divided into three equal groups, which makes it easier for maintenance personnel to identify them and avoids the situation where maintenance personnel connect the stop connecting piece 12 of one group of conductive rods 11 to another group of conductive rods 11.
[0048] An insulating handle 22 is provided at the sealing plug 2, allowing maintenance personnel to easily and safely remove the sealing plug 2 during equipment maintenance. A second flange 24 is provided at the bottom of the sealing plug 2, ensuring that the sealing plug 2 completely seals the top of the base body 1. A first injection channel 211 and a second injection channel 212 are provided inside the sealing plug 2, allowing insulating liquid to be added into the first columnar channel 14 at the top of the base body 1, so that the terminal 111 at one end of the conductive rod 11 is completely immersed in the insulating liquid.
[0049] By setting a sealing cap 3, the first injection channel 211 at the top of the sealing plug 2 can be completely covered. In addition, a twist cap 31 is set at the sealing cap 3 so that maintenance personnel can easily twist open the sealing cap 3.
[0050] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A voltage range adjuster for a non-excitation transformer, characterized in that, Includes the base, sealing plug, and sealing cap; The base is provided with several conductive rods and several stop connecting pieces. The bottom end of the conductive rod axially penetrates the base and extends out of the base. Both ends of the conductive rod are provided with terminals. The stop connecting piece is provided at the top of the base. The stop connecting piece is provided with a first fixing hole and a second fixing hole. The first fixing hole is connected to the terminal at the top of one of the conductive rods, and the second fixing hole is connected to the terminal at the top of the other conductive rod. The sealing plug is inserted into the base. The sealing plug is provided with a liquid injection channel, which is used to inject insulating liquid. The sealing cover is located at the top of the seat and is used to cover the sealing plug.
2. The voltage range adjuster for a non-excitation transformer as described in claim 1, characterized in that, The outer periphery of the base is surrounded by a first flange, the bottom of the first flange is provided with a first annular groove, and a first washer is provided in the first annular groove. The top of the base is provided with a first columnar channel, and the periphery of the first columnar channel is provided with a first thread.
3. The voltage range adjuster for a non-excitation transformer as described in claim 1, characterized in that, The outer wall of the middle part of the seat is provided with an annular groove group, and the inner wall of the bottom of the seat is provided with an annular boss.
4. The voltage range adjuster for a non-excitation transformer as described in claim 1, characterized in that, The seat body is provided with a partition boss, which includes a base column and at least two partition plates extending outward from the base column. A guide boss is also provided on one side of the partition plate.
5. The voltage range adjuster for a non-excitation transformer as described in claim 1, characterized in that, The sealing plug includes an insulating handle, a connecting post, and a second flange. The insulating handle is located at the top of the sealing plug, the connecting post is located in the middle of the sealing plug, and the second flange is located at the bottom of the sealing plug. The diameter of the second flange is larger than that of the insulating handle, and the diameter of the insulating handle is larger than that of the connecting post.
6. The voltage range adjuster for a non-excitation transformer as described in claim 5, characterized in that, The outer wall of the second flange is provided with a second annular groove, and a second gasket is provided in the second annular groove.
7. The voltage range adjuster for a non-excitation transformer as described in claim 1, characterized in that, The injection channel includes a first injection channel and a second injection channel. The first injection channel is located at the top of the second injection channel, and the diameter of the first injection channel is smaller than the diameter of the second injection channel.
8. The voltage range adjuster for a non-excitation transformer as described in claim 1, characterized in that, The sealing cap has a twist cap at the bottom, and the twist cap has several vertical reinforcing ribs around its perimeter.
9. The voltage range adjuster for a non-excitation transformer as described in claim 1, characterized in that, The bottom of the sealing cap is provided with a first columnar groove and a second columnar groove, the first columnar groove is located at the top of the second columnar groove, and the outer periphery of the second columnar groove is provided with a second thread.
10. The voltage range adjuster for a non-excitation transformer as described in claim 9, characterized in that, A third washer is provided at the top of the second columnar groove.