A three-phase combined instrument transformer

Abstract

The present invention provides a three-phase combined current transformer, which relates to the technical field of current transformers and includes a current transformer body, a housing, a driving mechanism and a locking mechanism. A cover plate is installed on one side of the top of the housing, and a rotating shaft is inserted into one side of the housing and the cover plate. An arc-shaped groove is formed on the surface of the cover plate. The current transformer body is installed inside the housing, and the top end of the current transformer body is electrically connected to a cable. A cable channel is formed at the bottom of the other side of the cover plate. After the cable passes through the bottom of the cable channel and extends outward, it is bent along the surface of the cover plate. In the present invention, the locking mechanism rotates to press and lock the connecting cable part, improving the stability of the cable connection. The vibration sensor after pressing is used to provide anti-theft and anti-loosening functions. On the side of the housing, different areas inside the current transformer body can be directly measured by means of the driving mechanism and the temperature measuring mechanism, thereby expanding the temperature measurement range and indirectly measuring the internal area of the current transformer body.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument transformers, and specifically to a three-phase combined instrument transformer. Background Art

[0002] A three-phase combined instrument transformer usually consists of three-phase voltage transformers and three single-phase (or two single-phase) current transformers. Its working principle is to transform high voltage into low voltage and large current into small current, so as to achieve the standardization and miniaturization of measuring instruments, protection devices and automatic control devices. At the same time, it is also used for the measurement of voltage, current and electric energy and relay protection.

[0003] In the existing three-phase combined instrument transformer, epoxy resin is poured inside to provide insulation protection effect, which results in a solid state inside the whole instrument transformer. Therefore, it is impossible to directly measure the temperature of the internal current transformer or voltage transformer at close range, and only the outer surface can be measured for temperature. As a result, the accuracy of temperature measurement is insufficient, and it is difficult to obtain data on the heating conditions of different regions. On the other hand, after the conventional combined instrument transformer cable is connected, it is easy to reduce the connection stability when it is collided or pulled. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a three-phase combined instrument transformer to solve the problems raised in the above background art. The present invention presses and locks the connection cable part by rotating the locking mechanism, improving the connection stability of the cable. With the vibration sensor after pressing, it provides anti-theft and anti-loosening functions. On the side of the outer shell, different regions inside the instrument transformer body can be directly measured for temperature by means of the driving mechanism and the temperature measuring mechanism, thus expanding the temperature measurement range and being able to indirectly measure the temperature of the internal region of the instrument transformer body.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: A three-phase combined instrument transformer includes an instrument transformer body, an outer shell, a driving mechanism and a locking mechanism. One side of the top of the outer shell is provided with a cover plate, and a rotating shaft is inserted on one side of the outer shell and the cover plate. An arc-shaped groove is formed on the surface of the cover plate. The instrument transformer body is installed inside the outer shell. The top end of the instrument transformer body is electrically connected to a cable. A cable channel is formed at the bottom of the other side of the cover plate. The cable passes through the bottom of the cable channel and then bends along the surface of the cover plate. A through hole is formed on the side of the outer shell. The middle part of the locking mechanism is embedded inside the through hole. A pressing rod is inserted at the top end of the locking mechanism. The pressing rod is used to press the connected cable into the arc-shaped groove. An extension plate is welded on the surface of the outer shell. The driving mechanism is installed at the end of the extension plate. The temperature measuring mechanism is sleeved on the surface of the driving mechanism.

[0006] Further, the locking mechanism includes a power arm, a plugging column, and a resistance arm. The power arm and the resistance arm are respectively welded to the surface of the plugging column. The top end of the resistance arm is plugged and fixed to the pressing rod. One side of the bottom of the power arm is welded with a pull rod, and a second threaded sleeve is provided on the end surface of the power arm.

[0007] Further, the plugging column is embedded into the inside of the through hole. A locking bolt is inserted into the inside of the second threaded sleeve. A locking hole is also provided on the surface of the outer shell. The locking bolt passes through the inside of the second threaded sleeve and then is embedded into the inside of the locking hole.

[0008] Further, an anti-theft component is inserted into the inside of the arc-shaped groove. The anti-theft component includes a support ring, a spring rod, and a vibration sensor. The bottom of the support ring is welded with a spring rod. The bottom of the spring rod is screwed with a vibration sensor. A hole is provided in the inside of the arc-shaped groove.

[0009] Further, the support ring is integrally in a semi-circular structure, and the bottom of the connected cable is pressed on the surface of the support ring. The two ends of the spring on the spring rod are respectively connected to the bottom of the support ring and the surface of the arc-shaped groove. The support ring is used to support the bottom surface of the connected cable. After the pressing rod presses the cable, it will be above the support ring.

[0010] Further, the driving mechanism includes a motor and a lead screw. An end plate is integrally formed at the end of the extension plate. The motor is screwed on the surface of one of the end plates. The output end of the motor is inserted with a lead screw. Temperature measuring holes are provided on the surfaces of the transformer body and the outer shell, and an independent heat conducting column is inserted into each temperature measuring hole.

[0011] Further, both ends of the lead screw are embedded into the inside of the end plate through bearings. One end of the temperature measuring mechanism is sleeved on the surface of the lead screw. The central axes of each heat conducting column are on the same horizontal plane as the central axis of the lead screw.

[0012] Further, the temperature measuring mechanism includes a first threaded sleeve, a transmission rod, and a rotating sleeve. One end of the heat conducting column passes outwards from the surface of the outer shell, and a gap is provided between each heat conducting column. The transmission rod is welded on the surface of the first threaded sleeve.

[0013] Further, the rotating sleeve is sleeved on the surface of the transmission rod. A gear is welded on the surface of the rotating sleeve. A detection column is installed at the end of the rotating sleeve. A plurality of card slots are provided on the side of the detection column. The gear is meshed with a part of the rack.

[0014] Further, the card slot is used to press on the surface of the heat conduction column, the first threaded sleeve is sleeved on the surface of the lead screw, a temperature sensing module is embedded in the detection column, a heat conduction sheet is attached to the surface of the card slot, and the detection column is in contact and fit with the heat conduction column through the heat conduction sheet.

[0015] Advantages of the present invention:

[0016] 1. The three-phase combined current transformer presses and locks the connecting cable part by rotating the locking mechanism, so that the connected cable part is pressed inside the arc-shaped groove. With the help of this pressure, the stability of the cable connection is improved. After each cable is pressed, it directly abuts against the top of the supporting ring, and cooperates with the vibration sensor after pressing to provide anti-theft and anti-loosening functions, and triggers an alarm when there is electricity theft or severe pulling.

[0017] 2. A plurality of communicating temperature measuring holes are provided on the surface of the outer shell and inside the current transformer body of the three-phase combined current transformer. Each temperature measuring hole is close to different structural areas inside the current transformer body. By embedding a heat conduction column with high thermal conductivity into the temperature measuring hole, the internal area of the current transformer body can be indirectly measured for temperature.

[0018] 3. The side of the three-phase combined current transformer drives the temperature measuring mechanism to move and rotate through the driving mechanism, and the temperature measuring mechanism moves and docks along a plurality of heat conduction columns, so that the temperature of different areas inside the current transformer body can be directly measured, thus expanding the temperature measuring range, and the movement process is more stable and accurate. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the outer shape of a three-phase combined current transformer of the present invention;

[0020] Figure 2 is a schematic structural diagram of the outer shell part of a three-phase combined current transformer of the present invention;

[0021] Figure 3 is a schematic structural diagram of the cover plate part of a three-phase combined current transformer of the present invention;

[0022] Figure 4 is Figure 3 the enlarged view of area A in

[0023] Figure 5 is a schematic structural diagram of the driving mechanism part of the present invention;

[0024] Figure 6 is a schematic diagram of the temperature measuring mechanism part of the present invention;

[0025] Figure 7 is a schematic structural diagram of the locking mechanism part of the present invention;

[0026] In the figure: 1, outer shell; 2, cover plate; 3, driving mechanism; 4, locking mechanism; 5, rotating shaft; 6, mutual inductor body; 7, through hole; 8, locking hole; 9, temperature measuring hole; 10, extension plate; 11, end plate; 12, cable channel; 13, arc-shaped groove; 14, anti-theft component; 15, supporting ring; 16, spring rod; 17, vibration sensor; 18, heat conducting column; 19, motor; 20, lead screw; 21, rack; 22, temperature measuring mechanism; 23, first threaded sleeve; 24, transmission rod; 25, rotating sleeve; 26, gear; 27, detection column; 28, clamping groove; 29, heat conducting sheet; 30, temperature sensing module; 31, power arm; 32, plugging column; 33, resistance arm; 34, pressing rod; 35, pull rod; 36, second threaded sleeve; 37, locking bolt. Specific embodiments

[0027] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0028] Please refer to Figures 1 to 7 , the present invention provides the following technical solutions: A three-phase combined mutual inductor, including a mutual inductor body 6, an outer shell 1, a driving mechanism 3 and a locking mechanism 4. One side of the top of the outer shell 1 is provided with a cover plate 2, and a rotating shaft 5 is inserted on one side of the outer shell 1 and the cover plate 2. An arc-shaped groove 13 is opened on the surface of the cover plate 2. The mutual inductor body 6 is installed inside the outer shell 1. The top end of the mutual inductor body 6 is electrically connected to a cable. A cable channel 12 is opened at the bottom of the other side of the cover plate 2. After the cable passes through the bottom of the cable channel 12 and exits towards the outside, it is bent along the surface of the cover plate 2. A through hole 7 is opened on the side of the outer shell 1. The middle parts of the locking mechanisms 4 are all embedded inside the through hole 7. A pressing rod 34 is inserted at the top end of the locking mechanism 4. The pressing rod 34 is used to press the connected cable into the arc-shaped groove 13. An extension plate 10 is welded on the surface of the outer shell 1. The driving mechanism 3 is installed at the end of the extension plate 10. A temperature measuring mechanism 22 is sleeved on the surface of the driving mechanism 3. This three-phase combined mutual inductor can press and fix the connected cable and provide an anti-theft function with the help of the anti-theft component 14.

[0029] When the present invention is in use, after the device is fixed to the ground, the cover plate 2 at the top can be opened. At this time, the cable is directly connected to the terminal part at the top of the current transformer body 6, and then the cable passes through the cable channel 12 on one side of the cover plate 2. After the cover plate 2 is closed, the locking mechanism 4 is rotated, and the passed-out cable part can be bent and pressed against the top until the cable is pressed inside the arc-shaped groove 13 and an extrusion force is generated with the anti-theft component 14, thus completing the locking process of the cable part. Subsequently, during the long-term use process, by starting the driving mechanism 3, the temperature measuring mechanism 22 can be driven to move, and during the movement process, it can be successively in contact and fit with each heat conducting column 18, thereby achieving the purpose of measuring the temperature of the fixed area inside the current transformer body 6 corresponding to each heat conducting column 18.

[0030] In this embodiment, the locking mechanism 4 includes a power arm 31, a plug-in column 32, and a resistance arm 33. The power arm 31 and the resistance arm 33 are respectively welded to the surface of the plug-in column 32. The top end of the resistance arm 33 is inserted and fixed with a pressing rod 34. A pull rod 35 is welded to one side of the bottom of the power arm 31, and a second threaded sleeve 36 is provided on the end surface of the power arm 31. The plug-in column 32 is embedded into the through hole 7. A locking bolt 37 is inserted into the second threaded sleeve 36, and a locking hole 8 is also provided on the surface of the housing 1. The locking bolt 37 passes through the second threaded sleeve 36 and is then embedded into the locking hole 8.

[0031] Specifically, by manually pulling the pull rod 35, the power arm 31 at the bottom can be driven to rotate, and the resistance arm 33 at the other end can be controlled to rotate around the middle plug-in column 32, finally driving the pressing rod 34 at the top to rotate. During the process of the pressing rod 34 rotating from the initial obliquely downward direction towards the top, the cable part that has passed through the cable channel 12 can be lifted towards the top and gradually pressed on the surface of the cover plate 2 until the cable is completely pressed inside the arc-shaped groove 13 and is in extrusion fit with the anti-theft component 14. At this time, the second threaded sleeve 36 at the bottom end of the power arm 31 will be aligned with the locking hole 8. Therefore, in this state, the power arm 31 can be directly fixed to the housing 1 by using the locking bolt 37 to ensure that the cable part can always be provided with an extrusion force.

[0032] In this embodiment, an anti-theft component 14 is inserted into the arc-shaped groove 13. The anti-theft component 14 includes a supporting ring 15, a spring rod 16, and a vibration sensor 17. The bottom of the supporting ring 15 is welded with the spring rod 16, and the bottom of the spring rod 16 is screwed with the vibration sensor 17. A hole is formed in the arc-shaped groove 13. The supporting ring 15 is integrally in a semi-circular structure, and the bottom of the connected cable presses on the surface of the supporting ring 15. The two ends of the spring on the spring rod 16 are respectively connected to the bottom of the supporting ring 15 and the surface of the arc-shaped groove 13. The supporting ring 15 is used to support the bottom surface of the connected cable. After the pressing rod 34 presses the cable, it will be above the supporting ring 15. By rotating the locking mechanism 4 to press and lock the connected cable part, the connected cable part is pressed inside the arc-shaped groove 13, and the stability of the cable connection is improved by means of this pressure. After each cable is pressed, it directly abuts against the top of the supporting ring 15, cooperating with the vibration sensor 17 after pressing to provide anti-theft and anti-loosening functions, and triggering an alarm when there is power theft or violent pulling.

[0033] Specifically, after the cable is pressed on the anti-theft component 14 by the locking mechanism 4, since the pressure exerted by the cable directly acts on the surface of the supporting ring 15, the supporting ring 15 will be pressed downward. The spring rod 16 at the bottom of the supporting ring 15 causes the spring to compress, and it is used in this state. When there is power theft or malicious damage to the cable part, once the cable slides or becomes loose, it will change the pressure exerted on the supporting ring 15, thereby changing the compression effect generated by the spring rod 16 part, causing the vibration sensor 17 at the bottom to vibrate and generating an electrical signal to trigger the built-in alarm system. Among them, the vibration sensor 17 and the matching alarm system are both existing mature technologies and do not fall within the protection scope of the present invention. Therefore, their internal structures and principles will not be elaborated here.

[0034] In this embodiment, the driving mechanism 3 includes a motor 19 and a lead screw 20. The end of the extension plate 10 is integrally formed with an end plate 11. The motor 19 is screwed on the surface of one of the end plates 11. The output end of the motor 19 is inserted with the lead screw 20. Temperature measurement holes 9 are formed on the surfaces of the current transformer body 6 and the housing 1, and independent heat conducting columns 18 are inserted into each temperature measurement hole 9. Both ends of the lead screw 20 are embedded into the end plate 11 through bearings. One end of the temperature measurement mechanism 22 is sleeved on the surface of the lead screw 20. The central axes of each heat conducting column 18 are on the same horizontal plane as the central axis of the lead screw 20. By means of the driving mechanism 3 driving the temperature measurement mechanism 22 to move and rotate, and the temperature measurement mechanism 22 moving and docking along multiple heat conducting columns 18, the temperature of different regions inside the current transformer body 6 can be directly measured, thereby expanding the temperature measurement range and making the moving process more stable and accurate.

[0035] Specifically, after starting the motor 19, the motor 19 drives the lead screw 20 to rotate. Then, through the rotation of the lead screw 20 and the cooperation with the first threaded sleeve 23 on the temperature measuring mechanism 22, the entire temperature measuring mechanism 22 can be driven to move. During the movement, it will sequentially come into contact with each heat conducting column 18. In this embodiment, the heat conducting column 18 is made of alumina ceramic material with high thermal conductivity and insulation, and is used for heat conduction and temperature measurement of the internal solid structure area of the three-phase combined transformer.

[0036] In this embodiment, the temperature measuring mechanism 22 includes a first threaded sleeve 23, a transmission rod 24 and a rotating sleeve 25. One end of each heat conducting column 18 penetrates outward from the surface of the housing 1, and there is a gap between each heat conducting column 18. The transmission rod 24 is welded to the surface of the first threaded sleeve 23. A rotating sleeve 25 is sleeved on the surface of the transmission rod 24. A gear 26 is welded to the surface of the rotating sleeve 25. A detection column 27 is installed at the end of the rotating sleeve 25. A plurality of card slots 28 are formed on the side of the detection column 27. The gear 26 and the rack 21 are partially engaged. The card slots 28 are used to press on the surface of the heat conducting column 18. The first threaded sleeve 23 is sleeved on the surface of the lead screw 20. A temperature sensing module 30 is embedded in the detection column 27. A heat conducting sheet 29 is attached to the surface of the card slot 28. The detection column 27 is in contact with the heat conducting column 18 through the heat conducting sheet 29. A plurality of communicating temperature measuring holes 9 are formed on the surface of the housing 1 and inside the transformer body 6. Each temperature measuring hole 9 is close to different structural areas inside the transformer body 6. By embedding the heat conducting column 18 with high thermal conductivity into the temperature measuring hole 9, the internal area of the transformer body 6 can be indirectly measured for temperature.

[0037] Specifically, through the rotation of the lead screw 20, the transmission rod 24 is driven to move in cooperation with the first threaded sleeve 23. After the transmission rod 24 moves horizontally, the rotation of the rotating sleeve 25 can be controlled in cooperation with the gear 26 and the rack 21. Therefore, the detection column 27 at the end of the rotating sleeve 25 will sequentially come into contact with the surface of the heat conducting column 18 during its own rotational movement. The temperature transferred on the heat conducting column 18 is detected by means of the heat conducting sheet 29, and in cooperation with the temperature sensing module 30, the purpose of detecting the heating state of the heat conducting column 18 and the electrical components around the heat conducting column 18 embedded in the transformer body 6 can be achieved.

[0038] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

[0039] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A three-phase combined instrument transformer, characterized in that: It includes a mutual inductor body (6), a housing (1), a driving mechanism (3) and a locking mechanism (4). One side of the top of the housing (1) is provided with a cover plate (2), and a rotating shaft (5) is inserted on one side of the housing (1) and the cover plate (2). An arc-shaped groove (13) is formed on the surface of the cover plate (2). The mutual inductor body (6) is installed inside the housing (1). The top end of the mutual inductor body (6) is electrically connected to a cable. A cable channel (12) is formed at the bottom of the other side of the cover plate (2). The cable bends along the surface of the cover plate (2) after passing through the bottom of the cable channel (12) and extending outward. A through hole (7) is formed on the side of the housing (1). The middle parts of the locking mechanisms (4) are respectively embedded inside the through hole (7). A pressing rod (34) is inserted at the top end of the locking mechanism (4). The pressing rod (34) is used to press the connected cable into the arc-shaped groove (13). An extension plate (10) is welded on the surface of the housing (1). The driving mechanism (3) is installed at the end of the extension plate (10). A temperature measuring mechanism (22) is sleeved on the surface of the driving mechanism (3). A rack (21) is welded between the two extension plates (10). The driving mechanism (3) includes a motor (19) and a lead screw (20). An end plate (11) is integrally formed at the end of the extension plate (10). The motor (19) is screwed on the surface of one of the end plates (11). The output end of the motor (19) is inserted with a lead screw (20). Temperature measuring holes (9) are formed on the surfaces of the mutual inductor body (6) and the housing (1), and an independent heat conducting column (18) is inserted inside each temperature measuring hole (9). Both ends of the lead screw (20) are embedded inside the end plate (11) through bearings. One end of the temperature measuring mechanism (22) is sleeved on the surface of the lead screw (20). The central axes of each heat conducting column (18) are on the same horizontal plane as the central axis of the lead screw (20). The temperature measuring mechanism (22) includes a first threaded sleeve (23), a transmission rod (24) and a rotating sleeve (25). One end of the heat conducting column (18) passes through the surface of the housing (1) and extends outward, and a gap is provided between each heat conducting column (18). The transmission rod (24) is welded on the surface of the first threaded sleeve (23).

2. The three-phase combined current transformer according to claim 1, characterized in that: The locking mechanism (4) includes a power arm (31), a plugging column (32) and a resistance arm (33). The power arm (31) and the resistance arm (33) are respectively welded on the surface of the plugging column (32). The top end of the resistance arm (33) is plugged and fixed to the pressing rod (34). One side of the bottom of the power arm (31) is welded with a pull rod (35), and a second threaded sleeve (36) is formed on the end surface of the power arm (31).

3. The three-phase combined current transformer according to claim 2, characterized in that: The insertion post (32) is embedded inside the through hole (7). A locking bolt (37) is inserted through the inside of the second threaded sleeve (36). A locking hole (8) is further formed on the surface of the housing (1). The locking bolt (37) is inserted into the locking hole (8) after passing through the inside of the second threaded sleeve (36).

4. A three-phase combined instrument transformer according to claim 2, characterized in that: An anti-theft component (14) is inserted into the inside of the arc-shaped groove (13). The anti-theft component (14) includes a support ring (15), a spring rod (16) and a vibration sensor (17). The spring rod (16) is welded to the bottom of the support ring (15). The vibration sensor (17) is screwed to the bottom of the spring rod (16). A hole is formed inside the arc-shaped groove (13).

5. The three-phase combined instrument transformer according to claim 4, wherein: The support ring (15) is integrally in a semi-circular structure, and the bottom of the connected cable is pressed against the surface of the support ring (15). The two ends of the spring on the spring rod (16) are respectively connected to the bottom of the support ring (15) and the surface of the arc-shaped groove (13). The support ring (15) is used to support the bottom surface of the connected cable. After the pressing rod (34) presses the cable, it will be above the support ring (15).

6. A three-phase combined current transformer according to claim 1, wherein: A rotating sleeve (25) is sleeved on the surface of the transmission rod (24). A gear (26) is welded to the surface of the rotating sleeve (25). A detection post (27) is installed at the end of the rotating sleeve (25). A plurality of card slots (28) are formed on the side of the detection post (27). The gear (26) and the rack (21) are partially engaged with each other.

7. A three-phase combined current transformer according to claim 6, characterized in that: The card slot (28) is used to press against the surface of the heat conduction post (18). The first threaded sleeve (23) is sleeved on the surface of the lead screw (20). A temperature sensing module (30) is embedded inside the detection post (27). A heat conduction sheet (29) is attached to the surface of the card slot (28). The detection post (27) is in contact and fit with the heat conduction post (18) through the heat conduction sheet (29).

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