An oil-immersed vertical current transformer
By designing a sliding plate and cover plate structure in the oil-immersed upright current transformer, the problem of the cover plate being difficult to open in a confined space is solved, enabling convenient wiring and easy discharge of insulating oil, thus improving ease of use and operational efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG AIAO METAL MFG CO LTD
- Filing Date
- 2025-07-01
- Publication Date
- 2026-06-19
Smart Images
Figure CN224384065U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of current transmission technology, and in particular to an oil-immersed upright current transformer. Background Technology
[0002] A current transformer is an instrument used to measure alternating current. It works based on the principle of electromagnetic induction. A current transformer can convert a large current on the primary side into a small current on the secondary side to facilitate measurement and protection equipment. It is widely used in power systems for current measurement, monitoring, protection and control.
[0003] Oil-immersed upright current transformers are a type of current transformer. Unlike inverted current transformers, their U-shaped primary winding is located at the top of the transformer, while the secondary winding and oil tank are located at the bottom. During installation and use, insulating oil for insulation and cooling needs to be injected into the oil tank. Then, the secondary winding is connected to the terminals inside the electrical box located on the outer surface of the oil tank. In actual use, current measurement is also required through an external measuring device inside the electrical box.
[0004] When using existing current transformers, some environments require the current transformer to be installed inside the chassis. When wiring the internal sockets of the junction box, it is necessary to open the hinged flip cover of the junction box. However, the space inside the chassis is too small, making it difficult to open the flip cover. If a screw-fixed cover is used, the cover needs to be removed before use, which is quite cumbersome. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] To address the problems existing in the prior art, this utility model provides an oil-immersed vertical current transformer.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: an oil-immersed upright current transformer, including a bushing, an expander provided at the top end of the bushing, an oil tank provided at the bottom end of the bushing, a winding component provided inside the oil tank and the bushing, a wiring assembly provided on the outer surface of the oil tank, and an oil drain assembly provided at the bottom end of the oil tank.
[0009] The wiring assembly includes a junction box fixedly connected to the outer surface of an oil tank. The junction box has an inlet, and a sliding plate is slidably connected inside the junction box. A cover plate is slidably connected to the side of the sliding plate near the junction box. Both the sliding plate and the cover plate have round holes that mate with the inlet.
[0010] The oil draining assembly includes a fixed cylinder fixedly connected to the lower surface of the oil tank, a locking cylinder movably connected inside the fixed cylinder, a fixed block fixedly connected to the top of the locking cylinder, a sealing disc fixedly connected to the top of the fixed block, and a threaded pin threadedly connected to the bottom of the fixed cylinder, the top of the threaded pin passing through the top of the fixed cylinder and threadedly connected to the bottom of the locking cylinder.
[0011] In a preferred embodiment of the oil-immersed upright current transformer of this utility model, a locking pin is inserted inside the junction box, a socket for the locking pin is provided on the outer surface of the sliding plate, a circular protrusion is provided on the outer surface of the locking pin, and grooves for the circular protrusion are provided on the inner wall of the socket of the sliding plate and the inside of the junction box.
[0012] In a preferred embodiment of the oil-immersed upright current transformer of this utility model, a limiting plate is fixedly connected to the side of the cover plate near the sliding plate, and a limiting groove that cooperates with the limiting plate is provided on the side of the sliding plate near the cover plate. The junction box is provided with a limiting groove for the sliding plate to slide.
[0013] In a preferred embodiment of the oil-immersed upright current transformer of this utility model, a connecting rod is fixedly connected to the side of the cover plate near the sliding plate, and a rectangular groove for the movement of the connecting rod is provided inside the sliding plate.
[0014] In a preferred embodiment of the oil-immersed upright current transformer of this utility model, connecting blocks are fixedly connected to both sides of the locking cylinder, and a sliding groove for sliding of the connecting blocks is provided on the outer surface of the fixing cylinder. The top and bottom ends of the locking cylinder are always sealed to the inner wall of the fixing cylinder.
[0015] In a preferred embodiment of the oil-immersed upright current transformer of this utility model, an oil drain hole for draining oil is provided inside the locking cylinder and at the bottom of the inner cavity of the oil tank. The sealing disc can seal the oil drain hole at the bottom of the inner cavity of the oil tank. The bottom end of the threaded pin passes through the bottom of the fixed cylinder and is fixedly connected to a rotating block.
[0016] (III) Beneficial Effects
[0017] This utility model provides an oil-immersed vertical current transformer. It has the following advantages:
[0018] 1. Pull out the locking pin to disengage it from the sliding plate. Then, move the connecting rod to slide the cover plate, thereby aligning the cover plate with the round hole inside the sliding plate. Push the sliding plate so that the socket inside the junction box aligns with the round hole inside the sliding plate, thus exposing the socket for easy wiring. There is no need to flip open or disassemble the sealing plate, making it convenient to use.
[0019] 2. When the insulating oil needs to be replaced, rotate the rotating block to move the threaded pin downwards to open it. After the threaded pin is open, push the connecting block upwards. The locking cylinder and the fixing block will drive the sealing plate to rise, thereby draining the oil. When it is necessary to stop draining the oil, press the connecting block downwards to lower the locking cylinder and the sealing plate, sealing the oil drain hole inside the oil tank. This allows for easy control of opening and closing the oil drain at any time and will not cause pollution. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0022] Figure 2 This is an exploded structural diagram of the wiring assembly of this utility model.
[0023] Figure 3 This is a schematic diagram of the oil draining component of this utility model.
[0024] Figure 4 This is a cross-sectional structural diagram of the oil draining component of this utility model.
[0025] Figure 5 This is an exploded structural diagram of the locking cylinder of this utility model.
[0026] In the diagram, 1 is the expander; 2 is the sleeve; 3 is the oil tank; 4 is the wiring assembly; 401 is the junction box; 402 is the locking pin; 403 is the cover plate; 404 is the sliding plate; 405 is the limit plate; 406 is the socket; 5 is the oil drain assembly; 501 is the sealing disc; 502 is the fixing cylinder; 503 is the connecting block; 504 is the rotating block; 505 is the fixing block; 506 is the locking cylinder; and 507 is the threaded pin. Detailed Implementation
[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0028] Example 1
[0029] Reference Figure 1 and Figure 2This is the first embodiment of the present invention. This embodiment provides an oil-immersed vertical current transformer, including a bushing 2, an expander 1 at the top of the bushing 2, an oil tank 3 at the bottom of the bushing 2, a winding component inside the oil tank 3 and the bushing 2, a wiring assembly 4 on the outer surface of the oil tank 3, and an oil drain assembly 5 at the bottom of the oil tank 3. The wiring assembly 4 includes a junction box 401 fixedly connected to the outer surface of the oil tank 3, a socket 406 inside the junction box 401, a sliding plate 404 slidably connected inside the junction box 401, a cover plate 403 slidably connected to the side of the sliding plate 404 near the junction box 401, and round holes that cooperate with the socket 406 inside both the sliding plate 404 and the cover plate 403.
[0030] Specifically, a locking pin 402 is inserted inside the junction box 401, and a socket for the locking pin 402 is provided on the outer surface of the sliding plate 404. A circular protrusion is provided on the outer surface of the locking pin 402. The inner wall of the socket of the sliding plate 404 and the interior of the junction box 401 are provided with grooves that cooperate with the circular protrusion. A limiting plate 405 is fixedly connected to the side of the cover plate 403 near the sliding plate 404. A limiting groove for the limiting plate 405 is provided on the side of the sliding plate 404 near the cover plate 403. A limiting groove for the sliding plate 404 is provided inside the junction box 401. A connecting rod is fixedly connected to the side of the cover plate 403 near the sliding plate 404. A rectangular groove for the moving connecting rod is provided inside the sliding plate 404.
[0031] Furthermore, when wiring is required, the locking pin 402 is pulled out, causing it to disengage from the sliding plate 404. Then, the locking pin 402 engages with the groove inside the junction box 401 through the central protrusion on its outer surface, thereby fixing the locking pin 402. Then, the connecting rod is moved, and under the action of the connecting rod and the limiting plate 405, the cover plate 403 and the limiting plate 405 move to one end of the limiting groove, thereby aligning the cover plate 403 with the round hole inside the sliding plate 404. At this time, the sliding plate 404 is pushed into the junction box 401, so that the socket 406 inside the junction box 401 aligns with the round hole inside the sliding plate 404 and the cover plate 403, thus exposing the socket 406, which facilitates wiring. The connection relationship, working principle and operation sequence between the winding component and other components are existing technologies and are common knowledge known to those skilled in the art, and will not be elaborated further here.
[0032] Example 2
[0033] Reference Figure 1 , Figure 3 , Figure 4 and Figure 5This is the second embodiment of the present invention. This embodiment is based on the previous embodiment. The oil draining component 5 includes a fixed cylinder 502 fixedly connected to the lower surface of the oil tank 3. A locking cylinder 506 is movably connected inside the fixed cylinder 502. A fixed block 505 is fixedly connected to the top of the locking cylinder 506. A sealing disc 501 is fixedly connected to the top of the fixed block 505. A threaded pin 507 is threadedly connected to the bottom end of the fixed cylinder 502. The top end of the threaded pin 507 passes through the top end of the fixed cylinder 502 and is threadedly connected to the bottom end of the locking cylinder 506.
[0034] Specifically, connecting blocks 503 are fixedly connected to both sides of the locking cylinder 506. The outer surface of the fixing cylinder 502 is provided with a sliding groove for the connecting blocks 503 to slide. The top and bottom of the locking cylinder 506 are always sealed to the inner wall of the fixing cylinder 502. Oil drain holes for draining oil are provided inside the locking cylinder 506 and at the bottom of the inner cavity of the oil tank 3. The sealing disc 501 can seal the oil drain hole at the bottom of the inner cavity of the oil tank 3. The bottom end of the threaded pin 507 passes through the bottom of the fixing cylinder 502 and is fixedly connected to the rotating block 504.
[0035] Furthermore, when the insulating oil needs to be replaced, rotate the rotating block 504 to move the threaded pin 507 downwards and open it. During the rotation of the rotating block 504, the connecting block 503 needs to be held to keep the locking cylinder 506 under downward force. This, in turn, causes the sealing plate to remain sealed to the oil drain hole at the bottom of the inner cavity of the oil tank 3 through the fixing block 505. After the threaded pin 507 is opened, push the connecting block 503 upwards to raise the locking cylinder 506, the fixing block 505, and the sealing plate 501. This allows the insulating oil inside the oil tank 3 to enter the fixing cylinder 502 through the oil drain hole inside the locking cylinder 506 and be discharged through the threaded hole at the bottom of the fixing cylinder 502. When it is necessary to pause the oil draining, press the connecting block 503 downwards to lower the locking cylinder 506 and the sealing plate 501, thereby continuing to seal the oil drain hole inside the oil tank 3.
[0036] Working Principle: When using an oil-immersed upright current transformer, after installing the current transformer in the designated position, when wiring is required, pull out the locking pin 402, causing it to disengage from the sliding plate 404. Then, the locking pin 402 engages with the groove inside the junction box 401 through the central protrusion on its outer surface, thus fixing the locking pin 402. Next, move the connecting rod. Under the action of the connecting rod and the limiting plate 405, the cover plate 403 and the limiting plate 405 move to one end of the limiting groove, thereby aligning the cover plate 403 with the round hole inside the sliding plate 404. At this time, push the sliding plate 404 into the junction box 401, so that the socket 406 inside the junction box 401 aligns with the round hole inside the sliding plate 404 and the cover plate 403, thus exposing the socket 406, which facilitates wiring without needing to flip open or disassemble the sealing plate. It is convenient to use. After a certain period of use, it needs to be insulated. When changing the insulating oil, rotate the rotating block 504 to move the threaded pin 507 downwards and open it. During the rotation of the rotating block 504, the connecting block 503 needs to be held to keep the locking cylinder 506 under downward force. This, in turn, causes the sealing plate to remain sealed to the oil drain hole at the bottom of the inner cavity of the oil tank 3 through the fixing block 505. After the threaded pin 507 is opened, push the connecting block 503 upwards to raise the locking cylinder 506, the fixing block 505, and the sealing plate 501. This allows the insulating oil inside the oil tank 3 to enter the fixing cylinder 502 through the oil drain hole inside the locking cylinder 506 and be discharged through the threaded hole at the bottom of the fixing cylinder 502. When it is necessary to pause the oil draining, press the connecting block 503 downwards to lower the locking cylinder 506 and the sealing plate 501, thus continuing to seal the oil drain hole inside the oil tank 3. This facilitates the control of switching the oil draining on and off at any time and does not cause pollution. Finally, the use of the oil-immersed vertical current transformer is completed.
[0037] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
Claims
1. An oil-immersed vertical current transformer, comprising a bushing (2), wherein an expander (1) is provided at the top end of the bushing (2), and an oil tank (3) is provided at the bottom end of the bushing (2), wherein winding components are provided inside the oil tank (3) and the bushing (2), characterized in that: The outer surface of the oil tank (3) is provided with a wiring assembly (4), and the bottom of the oil tank (3) is provided with an oil drain assembly (5); The wiring assembly (4) includes a junction box (401) fixedly connected to the outer surface of the oil tank (3). The junction box (401) has a socket (406) inside. A sliding plate (404) is slidably connected inside the junction box (401). A cover plate (403) is slidably connected to the side of the sliding plate (404) near the junction box (401). Both the sliding plate (404) and the cover plate (403) have round holes that cooperate with the socket (406) inside. The oil drain assembly (5) includes a fixed cylinder (502) fixedly connected to the lower surface of the oil tank (3). A locking cylinder (506) is movably connected inside the fixed cylinder (502). A fixed block (505) is fixedly connected to the top of the locking cylinder (506). A sealing disc (501) is fixedly connected to the top of the fixed block (505). A threaded pin (507) is threadedly connected to the bottom of the fixed cylinder (502). The top of the threaded pin (507) passes through the top of the fixed cylinder (502) and is threadedly connected to the bottom of the locking cylinder (506).
2. An oil immersed upright current transformer according to claim 1, characterized in that: A locking pin (402) is inserted inside the junction box (401), and a socket for the locking pin (402) is provided on the outer surface of the sliding plate (404). A circular protrusion is provided on the outer surface of the locking pin (402), and grooves for cooperating with the circular protrusion are provided on the inner wall of the socket of the sliding plate (404) and inside the junction box (401).
3. An oil immersed upright current transformer according to claim 2, characterized in that: A limiting plate (405) is fixedly connected to the side of the cover plate (403) near the sliding plate (404). The limiting plate (405) and the sliding plate (404) near the cover plate (403) are provided with a limiting groove that cooperates with the limiting plate (405). The junction box (401) is provided with a limiting groove for the sliding plate (404) to slide inside.
4. An oil immersed upright current transformer according to claim 3, characterized in that: A connecting rod is fixedly connected to the side of the cover plate (403) near the sliding plate (404), and a rectangular groove for the moving of the connecting rod is provided inside the sliding plate (404).
5. An oil immersed upright current transformer according to claim 4, characterized in that: Both sides of the locking cylinder (506) are fixedly connected to connecting blocks (503), and the outer surface of the fixing cylinder (502) is provided with a sliding groove for the connecting blocks (503) to slide. The top and bottom of the locking cylinder (506) are always sealed to the inner wall of the fixing cylinder (502).
6. An oil immersed upright current transformer according to claim 5, characterized in that: The locking cylinder (506) and the bottom of the inner cavity of the oil tank (3) are provided with oil drain holes for draining oil. The sealing disc (501) can seal the oil drain hole at the bottom of the inner cavity of the oil tank (3). The bottom end of the threaded pin (507) passes through the bottom of the fixed cylinder (502) and is fixedly connected to the rotating block (504).