Current transformer with line protection
By using a line limiting cavity and a filling balloon structure, combined with the design of a contact roller limiter and a detachable maintenance port, the problem of current transformer line detachment is solved, achieving stable line connection and safe flame retardancy, thus improving equipment safety and maintenance efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI TRANSFORMER CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-07-07
AI Technical Summary
Existing current transformers are prone to wire detachment during use, resulting in the inability to provide measurement signals and posing a safety hazard.
The circuit employs a line limiting cavity and a filling balloon structure. The filling balloon wraps around the outer wall of the circuit and contacts the flame-retardant layer. Combined with the contact roller limiting and the design of a detachable maintenance port, the circuit can be limited and protected against flame retardancy.
It reduces the occurrence of loose and detached wires, improves the safety and ease of maintenance of the device, can promptly retard flames and delay line damage, and improves the safety factor and practicality of the equipment.
Smart Images
Figure CN224472316U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of current transformer technology, specifically a current transformer with line protection. Background Technology
[0002] Current transformers are crucial electrical devices in power systems, operating based on the principle of electromagnetic induction. They consist of a closed iron core and windings. The primary winding has fewer turns and is connected in series with the line whose current is being measured, while the secondary winding has more turns and is connected to measuring instruments and protection devices. Their core functions are twofold: firstly, to convert a large primary current into a smaller secondary current at a fixed ratio, providing measurement signals for ammeters, wattmeters, etc., facilitating accurate metering; and secondly, to transmit current signals to relay protection devices, prompting rapid action of these devices in the event of overloads, short circuits, or other faults, ensuring the safety of the power system. Simultaneously, they provide electrical isolation between high and low voltage circuits, ensuring the safety of personnel and equipment.
[0003] Current transformers in the current technology are often used autonomously for a long time without monitoring personnel. As a result, oxidation may occur at the terminals of the current transformer, and the current transformer may become disconnected due to vibration from other equipment. This may lead to the current transformer being unable to provide measurement signals, thus causing safety hazards.
[0004] A search revealed a Chinese patent document (publication number: CN204178915U) disclosing a zero-sequence current transformer for line protection. This utility model relates to a zero-sequence current transformer for line protection, comprising: a shell, an insulating box, a copper wire winding, a right locking pin, a left locking pin, an iron core, a boss, a left fixing block, a left pin, a right fixing block, a right pin, and insulating resin. The shell has a circular hollow semi-enclosed structure with left and right locking pins and a boss on it. The left and right locking pins are positioned opposite each other on the circumferential edge of the shell. The boss is located on the circumferential edge of the shell between the left and right locking pins and is integral with the shell. The insulating box consists of an upper cover and a lower cover, which are tightly fastened to form a hollow ring. The iron core has a circular structure and is located inside the cavity of the insulating box. The copper wire winding is evenly wound on the circumference of the insulating box to form a winding. The left and right fixing blocks are located at the left and right ends of the boss, respectively. This novel zero-sequence current transformer is not only simple in structure and low in cost, but most importantly, it is very easy to install and more reliable in operation, providing a safety guarantee for power supply lines. However, it still has the following drawbacks:
[0005] Although the aforementioned current transformers are simple in structure, low in cost, very convenient to install, and more reliable in operation, providing safety for power supply lines, there is still a possibility of line detachment, which may lead to the inability to provide measurement signals during use, thus posing a safety hazard. Summary of the Invention
[0006] The purpose of this utility model is to provide a current transformer with line protection to solve the problem mentioned in the background art that the line may come loose, which may lead to the inability to provide measurement signals during use, thus causing safety hazards.
[0007] To achieve the above objectives, this utility model provides the following technical solution: a current transformer with line protection, comprising a current transformer body, the bottom end of which abuts against the top end of a base plate, the base plate being installed inside the top end of a positioning frame, a mounting plate being installed at the front end of the base plate, guide grooves being equally spaced inside the top end of the mounting plate, guide sliders being slidably connected inside each guide groove, and a line limiting cavity being installed at the top end of each guide slider, an abutment balloon being installed on the inner sidewall of each line limiting cavity, a filling balloon being provided above the line limiting cavity, and a flame-retardant layer being tightly fitted to the bottom end of the filling balloon, the top end of the filling balloon being connected to the bottom end of a connecting plate, and a handle being installed at the top end of the connecting plate, plug-in plates being installed on both sides of the handle, and the bottom end of the plug-in plates being inserted into the top end of the plug-in cavity, the plug-in cavity being symmetrically installed on both sides of the mounting plate, and a plurality of line connection holes being provided at the front end of the current transformer body, the line connection holes corresponding to the line limiting cavities.
[0008] Preferably, a nameplate mounting cavity is installed at the top of the current transformer body, and an insertion slot is provided at the front end of the nameplate mounting cavity, and a glass cover plate is installed at the top of the nameplate mounting cavity.
[0009] Preferably, a connecting frame is symmetrically installed on the upper inner side wall of the positioning frame, and an abutting roller is rotatably connected inside the connecting frame. The outer side wall of the abutting roller abuts against the corresponding side wall of the current transformer body, and both ends of the abutting roller are connected to the inner side wall of the damping bearing. The damping bearing is symmetrically installed on the outer walls of both sides of the connecting frame.
[0010] Preferably, a first flexible sheet is symmetrically installed inside the insertion cavity, and a first limiting protrusion is installed at equal intervals on the corresponding outer side wall of the first flexible sheet. The outer side wall of the first limiting protrusion abuts against the outer side wall of the second limiting protrusion, and the second limiting protrusion is installed at equal intervals on the front and rear outer walls of the insertion plate.
[0011] Preferably, the rear end of the current transformer body is provided with an inspection port, the rear end of the current transformer body abuts against a contact plate corresponding to the inspection port, a sealing ring is installed at one end of the contact plate near the current transformer body, and a flexible baffle is installed on the outer side wall of the contact plate.
[0012] Preferably, the end of the contact plate away from the sealing ring is symmetrically equipped with a connecting block, and one end of the connecting block is inserted into the inside of the connecting cavity, which is symmetrically installed at the bottom of the substrate.
[0013] Preferably, a second flexible sheet is symmetrically mounted inside the substrate, and a first abutting protrusion is mounted at equal intervals on the corresponding outer side wall of the second flexible sheet. The outer side wall of the first abutting protrusion abuts against the outer side wall of the second abutting protrusion, and the second abutting protrusion is mounted at equal intervals on both outer side walls of the connecting block.
[0014] Preferably, a male hook and loop fastener is installed at the bottom of the inner side of the positioning frame, and a female hook and loop fastener is attached to the top of the male hook and loop fastener, and an absorbent layer is installed on the top of the female hook and loop fastener.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] 1. In use, this utility model places the circuit inside the circuit limiting cavity and wraps the outer wall of the circuit with a filling balloon. A downward-pressing connecting plate ensures that both the filling balloon and the flame-retardant layer are in contact with the top outer wall of the circuit. This contact-limiting method reduces the loosening of the circuit and further reduces the occurrence of detachment. It also helps to organize and limit the circuit, facilitating later maintenance. Furthermore, when the circuit spontaneously combusts, the flame-retardant layer, in contact with the top outer wall of the circuit, first provides flame retardancy. If the fire source is large, it may damage the flame-retardant layer and the bottom of the filling balloon. In this case, the flame-retardant particles inside the filling balloon will further retard the flame. This improves the safety factor of the device during use and avoids the phenomenon of multiple circuits being damaged due to spontaneous combustion. It allows for timely delay and protection, playing a crucial role in equipment rescue.
[0017] In use, this utility model employs a contact roller for positioning the current transformer body and a quick-release contact plate for sealing the inspection port at the rear of the current transformer body. Both of these measures improve the efficiency of subsequent maintenance work on the current transformer body and enhance the practicality and convenience of the device. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the rear view structure of this utility model;
[0020] Figure 3 This is a schematic diagram of the combined components of the base plate, positioning frame, contact roller and mounting plate in this utility model;
[0021] Figure 4 This is a schematic diagram of the combined components of the mounting plate, the circuit limiting cavity, the contact balloon, the insertion cavity, the insertion plate, the handle, the connecting plate, and the filling balloon in this utility model.
[0022] Figure 5 This is a schematic diagram of the combined component structure of the contact plate, sealing ring, flexible baffle, connecting block and connecting cavity in this utility model.
[0023] In the diagram: 1. Current transformer body; 2. Nameplate mounting cavity; 3. Glass cover plate; 4. Base plate; 5. Positioning frame; 6. Connecting frame; 7. Abutment roller; 8. Damping bearing; 9. Mounting plate; 10. Guide groove; 11. Line limiting cavity; 12. Abutment balloon; 13. Insertion cavity; 14. First flexible sheet; 15. First limiting protrusion; 16. Insertion plate; 17. Second limiting protrusion; 18. Handle; 19. Connecting plate; 20. Filling balloon; 21. Flame retardant layer; 22. Abutment plate; 23. Sealing ring; 24. Flexible baffle; 25. Connecting block; 26. Connecting cavity; 27. Second flexible sheet; 28. First abutment protrusion; 29. Second abutment protrusion; 30. Male Velcro; 31. Female Velcro; 32. Absorbent layer. Detailed Implementation
[0024] 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.
[0025] Example 1
[0026] Please see Figure 1-5 This utility model provides a current transformer with line protection, including a current transformer body 1. The lower front end of the current transformer body 1 is provided with line connection holes for connecting to the line at equal intervals. The rear of the current transformer body 1 is provided with an inspection port for maintenance of the current transformer body 1. The top of the current transformer body 1 is fixedly connected to a nameplate mounting cavity 2 for placing parameter information and precautions. The front end of the nameplate mounting cavity 2 is provided with an insertion slot for inserting the nameplate. The top of the nameplate mounting cavity 2 is fixedly connected to a glass cover plate 3.
[0027] During use, the required wiring is connected to the wiring connection hole at the front end of the current transformer body 1. The current parameter information of the relevant components is then obtained through the monitoring of the current transformer body 1. The nameplate containing the parameter information and precautions of the current transformer body 1 is inserted into the nameplate mounting cavity 2. The nameplate is protected by the glass cover plate 3 to extend its service life. At the same time, the inspection, maintenance or repair of the current transformer body 1 can be completed through the inspection port located at the rear of the current transformer body 1.
[0028] The current transformer body 1 is placed on the top of the substrate 4, and the substrate 4 is fixedly connected between the inner walls of the two sides of the positioning frame 5 with the "concave" structure. The positioning frame 5 is fixedly connected to two connecting frames 6 on both sides of the inner wall of the substrate 4. The connecting frame 6 is rotatably connected to the inside of the connecting frame 6, and the outer side wall of the connecting frame 7 abuts against the corresponding side wall of the current transformer body 1. The outer side walls of both sides of the connecting frame 6 are fixedly connected to the outer side wall of the damping bearing 8, and the inner side wall of the damping bearing 8 is connected to the corresponding end of the connecting frame 7 through the transmission rod.
[0029] By using the contact roller 7 to abut against the side wall of the current transformer body 1, the current transformer body 1 is limited. This method facilitates the removal of the current transformer body 1 for subsequent adjustments or maintenance. Furthermore, the contact roller 7 will be subjected to the damping force generated by the damping bearing 8, further improving the limiting effect of the current transformer body 1.
[0030] A mounting plate 9 is fixedly connected to the front end of the substrate 4. The top of the mounting plate 9 has evenly spaced guide grooves 10 corresponding to the circuit connection holes. Guide sliders are slidably connected inside each guide groove 10. These guide sliders are fixedly connected to the bottom end of a circuit limiting cavity 11 with a concave structure. An inflatable abutment balloon 12 is fixedly connected to the bottom end of each circuit limiting cavity 11. "L"-shaped insertion cavities 13 are symmetrically fixedly connected to both sides of the mounting plate 9. The insertion end of the insertion cavity 13 is the top end. A first flexible sheet 14, made of flexible plastic, is symmetrically fixedly connected inside the insertion cavity 13. Semi-cylindrical first limiting... The insertion plate 16 is inserted into the top of the insertion cavity 13. The insertion plate 16 and the outer wall of the first limiting protrusion 15 are fixedly connected with a second limiting protrusion 17 with a semi-cylindrical structure at equal intervals. The outer wall of the second limiting protrusion 17 abuts against the outer wall of the first limiting protrusion 15. The insertion plate 16 is symmetrically fixedly connected to the outer walls of both sides of the handle 18. The bottom of the handle 18 is fixedly connected to a connecting plate 19. The bottom of the connecting plate 19 is fixedly connected to a filling balloon 20. The filling balloon 20 is filled with flame-retardant particles. The bottom of the filling balloon 20 is fixedly connected to a flame-retardant layer 21. The flame-retardant layer 21 is a flame-retardant polyester fiber structure. The flame-retardant particles filled inside the filling balloon 20 are composed of at least polypropylene and phosphorus-based flame retardants.
[0031] After the wire is connected to the corresponding wire connection hole, the movable wire limiting cavity 11 is adjusted according to the size of the wire connector to fit the wire connector and limit its movement. The wire is then placed inside the wire limiting cavity 11, and the outer wall of the wire is wrapped by the filling balloon 20. The connecting plate 19 is pressed down to make both the filling balloon 20 and the flame-retardant layer 21 abut against the top outer wall of the wire. This method can organize and limit the wire, thus facilitating later maintenance. At the same time, when the wire spontaneously combusts, the flame-retardant layer 21 abuts against the top outer wall of the wire, thus preventing the flame from burning. If the spontaneous combustion source is large, it will damage the flame-retardant layer 21 and the bottom of the filling balloon 20. At this time, the flame-retardant particles filled inside the filling balloon 20 will further retard the flame, thus improving the safety factor of the device during use and avoiding the phenomenon that several lines will be damaged due to spontaneous combustion of the line. Timely delay protection work is carried out, which plays a vital role in the rescue of the equipment. When the connecting plate 19 moves vertically downward or upward, the plug plate 16 moves simultaneously inside the top of the plug cavity 13, and self-limiting is achieved after the first limiting protrusion 15 and the second limiting protrusion 17 abut against each other.
[0032] The rear end of the current transformer body 1 abuts against a contact plate 22 that covers the outside of the inspection port. A sealing ring 23 is fixedly connected to the end of the contact plate 22 near the current transformer body 1. A flexible baffle 24 is fixedly connected to the outer wall of the contact plate 22, and the flexible baffle 24 abuts against the outer wall of the rear end of the current transformer body 1. An "L"-shaped connecting block 25 is symmetrically fixedly connected to the outer wall of the end of the contact plate 22 away from the sealing ring 23. The end of the connecting block 25 away from the contact plate 22... All are inserted into the interior of the connecting cavity 26, and the connecting cavity 26 is symmetrically fixedly connected to the bottom end of the substrate 4. The interior of the connecting cavity 26 is symmetrically fixedly connected to a second flexible sheet 27. The second flexible sheet 27 is a flexible plastic structure, and the corresponding outer side wall of the second flexible sheet 27 is fixedly connected with a first abutting protrusion 28 of a semi-cylindrical structure at equal intervals. The outer side wall of the first abutting protrusion 28 abuts against the second abutting protrusion 29 of the semi-cylindrical structure. The second abutting protrusion 29 is symmetrically fixedly connected to the outer side walls of the connecting block 25 at equal intervals.
[0033] The baffle outside the inspection port is set as a quick-release contact plate 22. The contact plate 22 is connected to the inspection port by inserting it into the interior of the connecting cavity 26 through the connecting block 25. The outer wall of the first contact protrusion 28 abuts against the second contact protrusion 29, which limits the contact plate 22. After the contact plate 22 is inserted into place, the sealing ring 23 abuts against the outer wall of the rear end of the current transformer body 1 and covers the outside of the inspection port. At the same time, the flexible baffle 24 also abuts against the outer wall of the rear end of the current transformer body 1 and covers the outside of the inspection port. Through the effect of double protection, the moisture in the working environment is reduced from entering the inspection port. Thus, while having a quick-release design, the sealing effect is also guaranteed, improving practicality and convenience.
[0034] The bottom of the positioning frame 5 is fixedly connected to a male hook and loop fastener 30 with a hook-and-loop structure, and the top of the male hook and loop fastener 30 is bonded to the bottom of a female hook and loop fastener 31 with a velvet structure. The female hook and loop fastener 31 is fixedly connected to the bottom of the absorbent layer 32, which is a highly absorbent resin composite material.
[0035] With the water-absorbing layer 32 installed, the device can absorb moisture and water in the installation area during use, as it is located at the bottom of the device. In high-temperature environments, condensation may occur, or the equipment may condense due to temperature differences, and water droplets may accumulate at the bottom of the support. This evaporation may then affect the entire device. Timely absorption of moisture and water can effectively extend the service life of the device. Furthermore, the water-absorbing layer 32 is fixed by adhesive fasteners 30 and 31, making it easy to replace and maintain.
[0036] The specific usage process in this embodiment is as follows:
[0037] First, the positioning frame 5 is fixed to the working area of the current transformer body 1, and the current transformer body 1 is limited by the contact roller 7 against the side wall of the current transformer body 1.
[0038] Secondly, after the line is connected to the corresponding line connection hole, the movable line limiting cavity 11 is adjusted according to the size of the line connector to fit the line connector and limit its position. Then, the line is placed inside the line limiting cavity 11 and the outer wall of the line is wrapped by the filling balloon 20. The filling balloon 20 and the flame retardant layer 21 are pressed down by the connecting plate 19 to make the filling balloon 20 and the flame retardant layer 21 both abut against the top outer wall of the line.
[0039] Then, the baffle outside the inspection port is set as a quick-release contact plate 22. The contact plate 22 is connected to the inspection port by inserting it into the interior of the connection cavity 26 through the connecting block 25, and abutting against the second contact block 29 through the outer wall of the first contact block 28, which limits the contact plate 22. After the contact plate 22 is inserted into place, the sealing ring 23 abuts against the outer wall of the rear end of the current transformer body 1 and covers the outside of the inspection port. At the same time, the flexible baffle 24 also abuts against the outer wall of the rear end of the current transformer body 1 and covers the outside of the inspection port.
[0040] Subsequently, when the line spontaneously combusts, the flame-retardant layer 21 comes into contact with the outer wall at the top of the line, thus first retarding the flame through the flame-retardant layer 21. If the spontaneous combustion source is large, it will damage the flame-retardant layer 21 and the bottom of the filling balloon 20. At this time, the flame-retardant particles filled inside the filling balloon 20 will further retard the flame.
[0041] Finally, through the water-absorbing layer 32, during the overall use of the device, since the water-absorbing layer 32 is located at the lower part of the device, it can absorb water vapor and water in the installation area, thus completing the use of a current transformer with line protection.
[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A current transformer with line protection, comprising a current transformer body (1), characterized in that: The bottom end of the current transformer body (1) abuts against the top end of the base plate (4). The base plate (4) is installed inside the top end of the positioning frame (5). A mounting plate (9) is installed on the front end of the base plate (4). Guide grooves (10) are evenly spaced inside the top end of the mounting plate (9). Guide sliders are slidably connected inside the guide grooves (10). A line limiting cavity (11) is installed at the top end of the guide slider. Abutment balloons (12) are installed on the inner sidewalls of the line limiting cavity (11). A filling balloon (20) is provided above the line limiting cavity (11). The bottom of the filling balloon (20) is tightly fitted with a flame-retardant layer (21). The top of the filling balloon (20) is connected to the bottom of the connecting plate (19). The top of the connecting plate (19) is equipped with a handle (18). Both sides of the handle (18) are equipped with plug-in plates (16). The bottom of the plug-in plate (16) is inserted into the top of the plug-in cavity (13). The plug-in cavity (13) is symmetrically installed on both sides of the mounting plate (9). The front end of the current transformer body (1) is provided with several line connection holes, and the line connection holes correspond to the line limiting cavity (11).
2. A current transformer with line protection according to claim 1, characterized in that: The top of the current transformer body (1) is equipped with a nameplate mounting cavity (2), and the front end of the nameplate mounting cavity (2) is provided with an insertion slot. The top of the nameplate mounting cavity (2) is equipped with a glass cover plate (3).
3. A current transformer with line protection according to claim 1, characterized in that: The positioning frame (5) is symmetrically mounted with a connecting frame (6) on the upper side of its inner side wall, and the connecting frame (6) is rotatably connected with a contact roller (7). The outer side wall of the contact roller (7) abuts against the corresponding side wall of the current transformer body (1), and both ends of the contact roller (7) are connected to the inner side wall of the damping bearing (8). The damping bearing (8) is symmetrically mounted on the outer walls of both sides of the connecting frame (6).
4. A current transformer with line protection according to claim 1, characterized in that: The first flexible sheet (14) is symmetrically installed inside the insertion cavity (13), and the first limiting protrusion (15) is installed at equal intervals on the corresponding outer side wall of the first flexible sheet (14). The outer side wall of the first limiting protrusion (15) abuts against the outer side wall of the second limiting protrusion (17). The second limiting protrusion (17) is installed at equal intervals on the front and rear outer walls of the insertion plate (16).
5. A current transformer with line protection according to claim 1, characterized in that: The rear end of the current transformer body (1) is provided with an inspection port. The rear end of the current transformer body (1) is in contact with a contact plate (22) corresponding to the inspection port. A sealing ring (23) is installed on one end of the contact plate (22) near the current transformer body (1). A flexible baffle (24) is installed on the outer side wall of the contact plate (22).
6. A current transformer with line protection according to claim 5, characterized in that: The contact plate (22) is symmetrically equipped with a connecting block (25) at one end away from the sealing ring (23), and one end of the connecting block (25) is inserted into the inside of the connecting cavity (26), which is symmetrically installed at the bottom of the substrate (4).
7. A current transformer with line protection according to claim 6, characterized in that: The substrate (4) is symmetrically equipped with a second flexible sheet (27), and the corresponding outer side wall of the second flexible sheet (27) is equipped with a first abutting protrusion (28) at equal intervals. The outer side wall of the first abutting protrusion (28) abuts against the outer side wall of the second abutting protrusion (29), and the second abutting protrusion (29) is installed at equal intervals on both sides of the outer side wall of the connecting block (25).
8. A current transformer with line protection according to claim 1, characterized in that: The bottom of the positioning frame (5) is fitted with a male hook and loop fastener (30), and a female hook and loop fastener (31) is attached to the top of the male hook and loop fastener (30). An absorbent layer (32) is installed on the top of the female hook and loop fastener (31).