A current transformer

Abstract

The present application relates to the technical field of current transformer, in particular to a kind of current transformer, including mutual inductor body and one-way threading device.One-way threading device is installed in threading hole in mutual inductor body, and one-way threading mechanism is arranged in one-way threading device, and one-way threading mechanism includes at least two mutually cooperating threading subassemblies, and one-way openable and closable baffle plate is arranged in threading subassembly, the arrangement of the baffle plate makes that the threading of primary side cable of current transformer can only be from P1 end to P2 end, to avoid the situation of direction error in actual threading process, ensure the security of use.The present application is arranged in mutual inductor body one-way threading device, so that when the cable of current transformer primary side is threaded, cable can only be inserted from P1 end to P2 end, when reverse threading, threading cannot be carried out, so that in actual operation, the situation that cable is reverse threaded can be effectively avoided, ensure the security of use.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, and in particular to a current transformer. Background Art

[0002] A current transformer consists of a closed iron core and windings. It is an instrument that converts large primary current into small secondary current for measurement based on the principle of electromagnetic induction. Current transformers are widely used in smart grids and are commonly found in distribution cabinets. They are mainly used to expand the range of single-phase meters, measure single-phase line current, measure three-phase current in three-phase balanced or unbalanced lines, and sample current in reactive power controllers. They play an important role in the safe operation of power systems.

[0003] When using a current transformer, the direction of the primary current is particularly important. In actual use, the current transformer is marked with P1 and P2 terminals. The primary side large current can only be passed from P1 to P2, and cannot be passed in the reverse direction. Otherwise, when wiring the induced current, it is easy for the induced current output terminal to be ungrounded. When the induced current input terminal is open due to a fault or other reasons, a large electromotive force will be induced in the transformer, posing a serious safety hazard. Therefore, in actual operation, it is strictly forbidden to reversely pass the primary side large current to ensure safety.

[0004] Although there is a clear requirement that the cable can only be passed from the P1 end to the P2 end when passing the cable on the primary side, in actual operations, there are no relevant measures to ensure that the cable can only be passed from the P1 end to the P2 end. After the operator reverses the cable, the current transformer can still work normally. At this time, the hidden danger is only temporarily hidden. Only when an open circuit occurs at the terminal (S1 end) will the hidden danger be revealed. Once the hidden danger is revealed, the loss caused is unpredictable. Therefore, in actual operations, it is very necessary to set up a one-way threading device that allows the primary side cable to only pass from the P1 end to the P2 end, so as to fundamentally eliminate safety hazards and ensure the stable operation of the power system and the personal safety of the operators. Summary of the Invention

[0005] The purpose of the present invention is to provide a current transformer to solve the problem that when the operator is negligent in threading the wires on the primary side of the existing current transformer, the wire threading direction is easily incorrect, which brings serious safety hazards to the user.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a current transformer, comprising a transformer body and a one-way threader, wherein the transformer body is provided with a threading hole, the one-way threader is arranged in the threading hole, and a one-way threading mechanism is provided in the one-way threader, and the one-way threading mechanism enables the cable to be passed only from the P1 end of the transformer body to the P2 end.

[0007] Furthermore, the one-way threader is also provided with a front locking plate and a rear locking plate, and the one-way threading mechanism is detachably connected to the front locking plate and the rear locking plate respectively. The diameters of the front locking plate and the rear locking plate are larger than the diameter of the threading hole, and the diameter of the one-way threader is smaller than the diameter of the threading hole.

[0008] Furthermore, hooks are provided on both sides of the one-way threading mechanism, and slots are correspondingly provided on the front lock plate and the rear lock plate, and the slots cooperate with the hooks.

[0009] Furthermore, the one-way threading mechanism is composed of at least two threading sub-assemblies that cooperate with each other, each threading sub-assembly is detachably connected to the front locking plate and the rear locking plate, and the threading sub-assemblies cooperate with each other to ensure that the cable can only be passed from the P1 end to the P2 end of the transformer body.

[0010] Furthermore, the threading sub-assembly includes a connecting plate, the two ends of which are detachably connected to the front lock plate and the rear lock plate, and a baffle plate is hingedly connected to the connecting plate, and the baffle plate can only be rotated from the P1 end to the P2 end within a certain angle range; a rebound mechanism is also provided between the baffle plate and the connecting plate, and the rebound mechanism is provided on the side of the baffle plate close to the P2 end, and the rebound mechanism elastically supports and resets the baffle plate after rotation.

[0011] Furthermore, the connecting piece is provided with a limit stop near the P1 end, and the limit stop cooperates with the baffle plate, so that the limit stop allows the baffle plate to rotate only within a range of less than 90°.

[0012] Furthermore, the rebound mechanism includes a polyurethane spring, and both ends of the polyurethane spring are fixedly connected to the connecting piece and the baffle plate respectively.

[0013] Furthermore, the two ends of the polyurethane spring are fixedly connected to the connecting piece and the baffle plate through a locking mechanism respectively. A locking groove and a locking cover are provided in the locking mechanism. A threaded groove is provided in the locking groove. A socket is provided in the threaded groove. The diameter of the socket is smaller than the diameter of the threaded groove. An annular placement area is formed between the socket and the inner wall of the threaded groove, and an elastic rubber ring is placed on the annular placement area; a threaded connection part is provided below the locking cover, the threaded connection part cooperates with the threaded groove, a through hole is provided in the locking cover, the through hole cooperates with the socket, and the through hole and the socket are used to connect one end of the polyurethane spring. When the locking cover is tightened, the threaded connection part compresses the elastic rubber ring to deform, and the deformed elastic rubber ring contacts the polyurethane spring to squeeze and fix the polyurethane spring.

[0014] Furthermore, a pointer is provided on the outer side of each of the connecting pieces, and the pointer points from the P1 end to the P2 end.

[0015] Furthermore, the baffle plate is provided with a wire management groove, which includes two half grooves, and the two half grooves cooperate with each other to form a closed wire management groove; the two half grooves are respectively provided on two adjacent baffle plates.

[0016] Beneficial effects of the present invention:

[0017] 1. A one-way threader is set in the transformer body, so that when the cable on the primary side of the current transformer is threaded, the cable can only be inserted from the P1 end to the P2 end. When threading in the reverse direction, the cable cannot be threaded. Therefore, in actual operation, the reverse threading of the cable can be effectively avoided, ensuring the safety of use.

[0018] 2. The one-way threader and the transformer body adopt a detachable connection method, so that the one-way sensor can be installed on the existing current transformer, expanding its scope of use. After installation, it can be freely rotated between the transformer body. In actual installation, it is easy to adjust the angle of the transformer body and convenient to use;

[0019] 3. The one-way threading mechanism is composed of multiple threading sub-assemblies. On the one hand, it reduces the difficulty of manufacturing and installation, and on the other hand, it can produce products of different specifications according to actual needs, which is more convenient for practical application;

[0020] 4. The use of polyurethane spring as the elastic support of the rebound mechanism can prevent the alternating magnetic field from inducing induced electromotive force in the metal spring, thereby ensuring safety in use;

[0021] 5. It can not only realize the one-way threading of thick cables, but also assist in the fixation of thick cables. At the same time, it can also realize the wiring of thin cables, avoiding the deviation of the number of turns caused by complicated threading. It is more tidy and helps to ensure the accuracy of measurement.

[0022] 6. The setting of the external indicator of the one-way threading mechanism prevents errors from occurring during the assembly of the one-way threader, thereby avoiding the subsequent problem of incorrect threading direction.

[0023] 7. The polyurethane spring is connected to the connecting piece and the baffle plate with a locking mechanism, which ensures the stability and service life of use and plays a positive role in ensuring safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the P1 surface of the current transformer body of the present invention;

[0026] Figure 3This is a schematic structural diagram of the P2 surface of the current transformer body of the present invention;

[0027] Figure 4 This is an exploded schematic diagram of the one-way threader structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the buckle of the present invention when the slot and the hook cooperate;

[0029] Figure 6 Schematic diagram of the rebound mechanism structure of the present invention (back);

[0030] Figure 7 It is a structural schematic diagram of the locking mechanism of the present invention.

[0031] The names corresponding to the marks in the figure are:

[0032] 1. Transformer body; 11. Electromagnetic induction unit; 111. P1 terminal; 112. P2 terminal; 113. Threading hole; 12. Induction current output unit; 121. Positive terminal; 122. Negative terminal; 13. Mounting unit; 131. Mounting slot; 14. Information plate; 2. One-way threader; 21. Front lock plate; 22. One-way threading mechanism; 221. Threading subassembly; 222. Connecting piece; 223. Hook; 224. Baffle plate; 225. Cable management groove; 226. Pointer; 23. Rear locking plate; 24. Slot; 25. Rebound mechanism; 251. Limit stop; 252. Locking mechanism; 2521. Locking groove; 2522. Threaded groove; 2523. Socket; 2524. Annular placement area; 2525. Elastic rubber ring; 2526. Locking cover; 2527. Threaded connection; 2528. Through hole; 253. Polyurethane spring. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] Embodiments of the present invention:

[0035] like Figure 1-7 As shown, a current transformer of the present invention is provided with a transformer body 1 , and a one-way wire threader 2 is installed in a wire threading hole 113 in the transformer body 1 .

[0036] Among them, the transformer body 1 includes an electromagnetic induction part 11, the front side of the electromagnetic induction part 11 is the P1 end 111, the rear side of the electromagnetic induction part 11 is the P2 end 112, and a wire hole 113 is provided on the electromagnetic induction part 11 to pass through the P1 end 111 and the P2 end 112; the electromagnetic induction part 11 is connected to the induction current output part 12 at the bottom, and the induction current output part 12 is provided with a positive terminal 121 and a negative terminal 122; the electromagnetic induction part 11 is connected to the mounting part 13 at the bottom, and mounting slots 131 are provided on both sides of the mounting part 13, and the mounting part 13 cooperates with the distribution box guide rail; an information nameplate part 14 is provided above the electromagnetic induction part 11.

[0037] The one-way threader 2 is installed in the threading hole 113. The one-way threader 2 includes three parts, namely a front locking plate 21, a one-way threading mechanism 22 and a rear locking plate 23; the one-way threading mechanism 22 is detachably connected to the front locking plate 21 and the rear locking plate 23 respectively; the outer diameters of the front locking plate 21 and the rear locking plate 23 are larger than the outer diameter of the threading hole 113, and the outer diameter of the one-way threading mechanism 22 is smaller than the inner diameter of the threading hole 113; the one-way threader 2 can rotate freely in the threading hole 113, and the front locking plate 21 cooperates with the rear locking plate 23 to prevent the one-way threader 2 from falling off.

[0038] In one embodiment of the present invention, the front lock plate 21 and the rear lock plate 23 are connected to the one-way threading mechanism 22 through a snap fastener, wherein a slot 24 is provided on the front lock plate 21 and the rear lock plate 23 respectively, and a hook 223 is provided at both ends of the one-way threading mechanism 22 respectively, and the hook 223 cooperates with the slot 24.

[0039] The one-way threading mechanism 22 of the present invention is composed of multiple threading sub-assemblies 221, and there are at least two threading sub-assemblies 221. In one embodiment of the present invention, there are six threading sub-assemblies 221, and hooks 223 are provided on the front and rear sides of each threading sub-assembly 221. Correspondingly, six slots 24 are provided on the front lock plate 21 and the rear lock plate 23, respectively, and the slots 24 correspond one-to-one to the hooks 223.

[0040] A connecting piece 222 is provided in each threading sub-assembly 221, and hooks 223 are provided at both ends of the connecting piece 222. A baffle plate 224 is provided on the connecting piece 222, wherein the baffle plate 224 is hinged to the connecting piece 222, and a rebound mechanism 25 is provided between the baffle plate 224 and the connecting piece 222. Through the rebound mechanism 25, the baffle plate 224 can only rotate and reset within a certain range.

[0041] In one embodiment of the present application, a limiting block 251 is arranged on the front side of the baffle plate 224, and the baffle plate 224 is capable of rotating within the range of 0-90° through the limiting block 251; a polyurethane spring 253 is arranged between the rear side of the baffle plate 224 and the connecting plate 222, and the two ends of the polyurethane spring 253 are fixedly connected with the connecting plate 222 and the baffle plate 224 respectively.

[0042] In one embodiment of the present application, the two ends of the polyurethane spring 253 are fixedly connected with the connecting plate 222 and the baffle plate 224 respectively through an adhesive.

[0043] In another embodiment of the present application, the two ends of the polyurethane spring 253 are fixedly connected with the connecting plate 222 and the baffle plate 224 respectively through a locking mechanism 252.

[0044] In the locking mechanism 252, a locking groove 2521 is arranged, a threaded groove 2522 is arranged in the locking groove 2521, a plug hole 2523 is arranged in the threaded groove 2522, the diameter of the plug hole 2523 is smaller than that of the threaded groove 2522, thus, due to the arrangement of the plug hole 2523, an annular placement area 2524 is formed in the threaded groove 2522, and an elastic rubber ring 2525 is placed on the annular placement area 2524; a locking cover 2526 is arranged in the locking mechanism 252, a threaded connecting portion 2527 is arranged below the locking cover 2526, the threaded connecting portion 2527 is matched with the threaded groove 2522, a through hole 2528 is arranged in the locking cover 2526, the through hole 2528 is matched with the plug hole 2523, and the through hole 2528 is matched with the plug hole 2523 for the connection of one end of the polyurethane spring 253; when the locking cover 2526 is tightened, the threaded connecting portion 2527 presses the deformed elastic rubber ring 2525, the deformed elastic rubber ring 2525 is in contact with the polyurethane spring 253, and the polyurethane spring 253 is extruded and fixed.

[0045] In one embodiment of the present application, a wire arranging groove 225 is arranged on the baffle plate 224, wherein the wire arranging groove 225 is composed of two half grooves, one of which is arranged on each of the two adjacent baffle plates 224; the number of the wire arranging grooves 225 can be reasonably arranged according to the actual number of the baffle plates 224 and actual needs.

[0046] In one embodiment of the present application, a pointing mark 226 is further arranged on the outer side of each connecting plate 222, and in this embodiment, the pointing mark 226 points from the P1 end 111 to the P2 end 112.

[0047] In one embodiment of the present application, the one-way wire threading device 2 can also be fixedly connected with the transformer body 1, at this time, the one-way wire threading device 2 can only include the one-way wire threading mechanism 22, and the one-way wire threading mechanism 22 can be fixedly connected with the inner side wall of the wire threading groove.

[0048] The principle of the present invention is:

[0049] In an embodiment of the present invention, the one-way threader 2 and the transformer body 1 have two connection modes: detachable and non-detachable. For the non-detachable connection mode, it can be directly set when the product is manufactured; and for the detachable connection mode, it can be used for the assembly of existing products, so that the existing products also have the function of one-way threading. In addition, by adopting the detachable mode, the one-way threader 2 can also rotate freely, which brings convenience to the actual cable connection.

[0050] In the detachable connection method, the one-way threading mechanism 22 is assembled through the front locking plate 21 and the rear locking plate 23. During the process, one side is assembled first. It should be noted that the direction of the pointer 226 on each threading sub-assembly 221 should be kept consistent. When one side is assembled, the assembled one-way threading mechanism 22 is passed through the threading hole 113. At this time, it should be noted that the pointer 226 must point from the P1 end 111 to the P2 end 112. After the installation is completed, the other side can be assembled.

[0051] When threading the wires, if the current in the primary side cable is large, the cable is also correspondingly thicker. In actual applications, the maximum attenuation ratio is often used (the attenuation ratio is marked on the information plate). At this time, the cable can be directly passed through the threading hole 113 without the need for looping; since the cable is thicker, its strength is sufficient. At this time, the cable can be held by hand and passed directly through the threading hole 113. During the threading process, if the cable cannot be threaded, it means that the threading direction of the cable is wrong. At this time, the threading and releasing of the cable needs to be changed to ensure that the threading direction is from the P1 end 111 to the P2 end 112. At this time, the front end of each baffle plate 224 clamps the cable and also fixes the cable.

[0052] If in actual practice, the current on the primary side is small, a large proportion of attenuation is not required to make the secondary side meet the measurement requirements. At this time, the primary side cable needs to be looped, and the number of turns is determined according to the actual situation. Since the cable is often thinner and softer at this time, the baffle plate 224 can be manually pushed when threading. When it cannot be pushed, it means that the threading direction is wrong and the threading direction needs to be changed. After completing one threading, the cable can be pulled into the cable management groove 225, and then the next threading can be carried out. During the process, not only will there be no error in the threading direction, but the cables can also be sorted, avoiding the situation where the number of turns is confirmed incorrectly due to the complexity of the cables, thereby ensuring the accuracy of current measurement.

[0053] In the present invention, a polyurethane spring 253 is used as a rebound support for the baffle plate 224. The use of the polyurethane spring 253 can prevent the metal spring from generating induced electromotive force in the alternating magnetic field, thereby ensuring safety in use. The polyurethane spring 253 can be installed by gluing and a locking mechanism 252. Gluing is more convenient and less expensive in actual production, but its service life will be correspondingly reduced. When the locking mechanism 252 is used, although the cost is higher, it is more stable in use. In actual practical manufacturing, a reasonable choice can also be made according to actual needs.

[0054] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A current transformer, characterized in that: The invention comprises a mutual inductor body (1) and a one-way threader (2), wherein the mutual inductor body (1) is provided with a threading hole (113), the one-way threader (2) is arranged in the threading hole (113), and a one-way threading mechanism (22) is provided in the one-way threader (2), and the one-way threading mechanism (22) enables the cable to be threaded only from the P1 end (111) to the P2 end (112) of the mutual inductor body (1); The one-way threader (2) is further provided with a front locking plate (21) and a rear locking plate (23), and the one-way threading mechanism (22) is detachably connected to the front locking plate (21) and the rear locking plate (23), respectively. The diameters of the front locking plate (21) and the rear locking plate (23) are larger than the diameter of the threading hole (113), and the diameter of the one-way threader (2) is smaller than the diameter of the threading hole (113); The one-way threading mechanism (22) is composed of at least two threading subassemblies (221) that cooperate with each other, each threading subassembly (221) is detachably connected to the front locking plate (21) and the rear locking plate (23), and the threading subassemblies (221) cooperate with each other to enable the cable to be passed only from the P1 end (111) to the P2 end (112) of the transformer body (1); The threading subassembly (221) includes a connecting piece (222), the two ends of which are detachably connected to the front locking plate (21) and the rear locking plate (23), and a baffle plate (224) is hingedly connected to the connecting piece (222), and the baffle plate (224) can only rotate within a certain angle range from the P1 end (111) to the P2 end (112); a rebound mechanism (25) is further provided between the baffle plate (224) and the connecting piece (222), and the rebound mechanism (25) is provided on a side of the baffle plate (224) close to the P2 end (112), and the rebound mechanism (25) elastically supports and resets the baffle plate (224) after rotation.

2. A current transformer according to claim 1, characterized in that: The one-way threading mechanism (22) is provided with hooks (223) on both sides, and the front lock plate (21) and the rear lock plate (23) are correspondingly provided with slots (24), which cooperate with the hooks (223).

3. A current transformer according to claim 1, characterized in that: The connecting piece (222) is provided with a limit stop (251) near the P1 end (111), and the limit stop (251) cooperates with the baffle plate (224). The limit stop (251) enables the baffle plate (224) to rotate only within a range of less than 90 degrees.

4. A current transformer according to claim 1, characterized in that: The rebound mechanism (25) includes a polyurethane spring (253), and two ends of the polyurethane spring (253) are fixedly connected to the connecting piece (222) and the baffle plate (224) respectively.

5. A current transformer according to claim 4, characterized in that: The two ends of the polyurethane spring (253) are fixedly connected to the connecting piece (222) and the baffle plate (224) through a locking mechanism (252), a locking groove (2521) and a locking cover (2526) are provided in the locking mechanism (252), a thread groove (2522) is provided in the locking groove (2521), a socket (2523) is provided in the thread groove (2522), the diameter of the socket (2523) is smaller than the diameter of the thread groove (2522), an annular placement area (2524) is formed between the socket (2523) and the inner side wall of the thread groove (2522), and an elastic rubber ring (2525) is placed on the annular placement area (2524); A threaded connection portion (2527) is provided below the locking cover (2526), ​​and the threaded connection portion (2527) cooperates with the thread groove (2522). A through hole (2528) is provided in the locking cover (2526), ​​and the through hole (2528) cooperates with the insertion hole (2523). The through hole (2528) and the insertion hole (2523) cooperate to connect one end of the polyurethane spring (253). When the locking cover (2526) is tightened, the threaded connection portion (2527) compresses the elastic rubber ring (2525) to deform, and the deformed elastic rubber ring (2525) contacts the polyurethane spring (253), thereby squeezing and fixing the polyurethane spring (253).

6. A current transformer according to claim 1, characterized in that: The outer sides of the connecting pieces (222) are each provided with a pointer (226), and the pointer (226) points from the P1 end (111) to the P2 end (112).

7. A current transformer according to claim 1, characterized in that: The baffle plate (224) is provided with a wire management slot (225), which includes two half slots. The two half slots cooperate with each other to form a closed wire management slot (225); the two half slots are respectively provided on two adjacent baffle plates (224).

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