Miniaturized current transformer convenient to install

Abstract

The utility model provides a convenient-to-install miniaturized current transformer relates to electrical equipment field, including mutual inductor main part, core through groove and cable structure, the core through groove is provided in mutual inductor main part, and the core through groove passes through the cable structure, the upper part of core through groove opening is provided with a first clamping piece, the lower part is provided with a second clamping piece, the core through groove opening is provided with a second clamping piece, and the second clamping piece is provided with a second clamping piece. And stabilizing structures are arranged in the first clamping piece and the second clamping piece. The first clamping piece and the second clamping piece are arranged at the opening of the core penetrating groove of the mutual inductor body, the cable structure is clamped through the positioning spring, the connecting sleeve and the stable shaft rod, the installation process is simplified, no complex tool is needed, installation can be completed only by enabling the cable structure to penetrate through the core penetrating groove and then closing the clamping pieces, and time is saved. Meanwhile, the stable structure is made of rubber materials with radian and anti-skid lines, the friction force between the stable structure and the cable structure is increased, the mutual inductor body is prevented from sliding, and the insulation effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electrical equipment especially, relate to a miniaturized current transformer convenient to install. BACKGROUND

[0002] In the operation monitoring and control of modern power systems and various electrical equipment, the current transformer plays a crucial role, which can convert large current into small current signal for measurement, protection and other secondary devices. With the continuous development of electronic technology and the increasing trend of equipment integration and miniaturization, miniaturized current transformers have emerged and been widely used.

[0003] However, the miniaturized current transformer faces many challenges in actual installation process. Due to its significant size reduction, the traditional installation method for large and medium-sized current transformers cannot be directly applied. Conventional installation often needs to first accurately determine the appropriate position of the current transformer on the cable, and then fasten with bolts, nuts or use a strap tool for binding and fixing. However, in a small space, it is not only inconvenient to use tools, but also difficult to accurately position and firmly fix, which may lead to unstable installation of the current transformer due to small deviations or looseness, affecting its measurement accuracy and reliability. Although the strap is relatively simple, it may loosen due to aging and stress deformation during long-term operation, and its reliability is greatly reduced in some special environments (such as high temperature, high humidity or strong vibration environment).

[0004] In addition, in some scenarios that require large-scale deployment of current transformers, such as electrical wiring systems of large factories, complex power substations, etc., the complexity of traditional installation methods dramatically increases the time and labor costs required for installation. The low installation efficiency not only affects the project progress, but also may cause inconvenience to production and life due to long-term power outage installation.

[0005] Therefore, there is an urgent need for a new type of miniaturized current transformer that is easy to install, which can simplify the installation process, through innovative design, such as setting special clamping structure at the sensor opening, so that it can be directly and stably fixed on the cable, reducing installation time and labor input, improving installation convenience, accuracy and stability, to meet the needs of modern electrical system rapid development and efficient operation. SUMMARY

[0006] The utility model discloses to the deficiency in the prior art, through setting up first clamping piece and second clamping piece at the core slot opening of mutual inductor main part, and with the help of positioning spring, connecting sleeve and stable axle lever to clamp cable structure, simplify the installation process, do not need complex tool, only need to close clamping piece after the cable structure is passed through the core slot to complete installation, save time. Meanwhile, the stable structure adopts the rubber material with radian and antiskid line, which increases the friction force with the cable structure to prevent the mutual inductor main part from sliding and plays an insulating role.

[0007] In order to solve the above technical problems, the utility model solves the problem that the miniaturized current transformer can simplify the installation process during installation through the following technical scheme.

[0008] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0009] A miniaturized current transformer convenient to install, including mutual inductor main part, core slot and cable structure, the core slot is opened in the inside of mutual inductor main part, and the cable structure is passed through the core slot, the first clamping piece is arranged above the core slot opening, and the second clamping piece is arranged below, the inside of first clamping piece and second clamping piece is provided with stable structure, the stable structure is in contact with the surface of cable structure, and the positioning spring is arranged between first clamping piece and second clamping piece.

[0010] Preferably, the contact surface of the stable structure is provided with a radian, and the radian surface has an anti-skid pattern.

[0011] Preferably, the two sides of the stable structure are symmetrically glued with second plugs, and the second plugs are inserted into the matching grooves of the first clamping piece or the second clamping piece.

[0012] Preferably, the second plug is designed as a ball shape and has elasticity.

[0013] Preferably, the first clamping piece and the second clamping piece are designed symmetrically, the two sides of the first clamping piece and the second clamping piece are connected with connecting sleeves, the corresponding stable shafts are movably installed in the connecting sleeves, end plates are symmetrically arranged on the upper and lower ends of the stable shafts for limiting, the positioning spring is arranged between the connecting sleeve and the end plate, and the positioning spring surrounds the outer shaft of the stable shaft.

[0014] Preferably, the upper and lower ends of the end plate are provided with grooves, and the end plate is sleeved on the grooves.

[0015] Preferably, the outer wall of the stable shaft groove is connected with a clamping block, the inside of the end plate is provided with a clamping groove, and the clamping block is inserted into the clamping groove.

[0016] Preferably, the second clamping piece is internally connected with a positioning holder, the transformer body is externally connected with a plug rod, the other end of the plug rod is externally connected with a first plug, and the plug rod and the first plug are inserted into the interior of the positioning holder.

[0017] Preferably, the second clamping piece is externally provided with an external stabilizing frame, and the external stabilizing frame is connected to the external wall of the transformer body.

[0018] Preferably, the first clamping piece is externally provided with a slot, and the slot is externally provided with an anti-skid layer.

[0019] Compared with the prior art, the current transformer has the following beneficial effects:

[0020] The current transformer provided by the application is small in size and convenient to install, the first clamping piece and the second clamping piece are arranged at the core-penetrating groove opening of the transformer body, the cable structure is clamped by means of the positioning spring, the connecting sleeve and the stabilizing shaft rod, the installation process is simplified, no complex tools are needed, and installation can be completed by only closing the clamping pieces after the cable structure is penetrated through the core-penetrating groove, thereby saving time. Meanwhile, the stabilizing structure is made of rubber material with an arc and anti-skid lines, which not only increases the friction with the cable structure to prevent the transformer body from sliding, but also plays an insulating role.

[0021] The existence of the positioning spring provides the first clamping piece and the second clamping piece with continuous pre-tightening force. In a long-term operation process, even if affected by environmental factors (such as temperature changes, slight vibrations, etc.), the pre-tightening force can ensure that the first clamping piece and the second clamping piece always tightly clamp the cable structure, thereby ensuring the stability of the current transformer installation.

[0022] The second clamping piece is connected by means of the plug rod, the first plug and the positioning holder, and is fixed by the external stabilizing frame, thereby ensuring stable installation on the transformer body. This design can effectively prevent the second clamping piece from loosening or displacing during use, thereby further ensuring the stability of the entire current transformer.

[0023] The current transformer comprises the distance adjusting structure formed by the connecting sleeve, the stabilizing shaft rod, the end plate and the positioning spring, and can adapt to cable structures of different diameters. When a thicker or thinner cable is encountered, an operator can simply adjust the distance between the first clamping piece and the second clamping piece to stably clamp the cable. This universality makes the current transformer widely applicable to various electrical systems, without the need to specially customize different models of current transformers for cables of different diameters, thereby reducing production costs and inventory pressure.

[0024] The stable structure is connected with the first clamping piece or the second clamping piece through the spherical and elastic second plug on the two sides. This design makes the stable structure convenient to replace when damaged. The operator only needs to pull out the damaged stable structure from the corresponding clamping piece and then insert the new stable structure, without disassembling or complex maintenance operation of the whole current transformer, which greatly reduces the maintenance cost and maintenance time. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is an overall structure diagram of the present application;

[0027] Figure 2 It is an overall split structure diagram of the present application;

[0028] Figure 3 It is a split local structure diagram of the present application;

[0029] Figure 4 It is a rear view local structure diagram of the first clamping piece and the second clamping piece of the present application;

[0030] Figure 5 It is a bottom view cross-section local structure diagram of the first clamping piece of the present application;

[0031] Figure 6 It is a left side view cross-section local structure diagram of the second clamping piece of the present application;

[0032] Figure 7 It is a right side view cross-section local structure diagram of the present application;

[0033] Figure 8 It is an enlarged structure diagram of position A of the present application. Figure 7

[0034] Figure number explanation: 1, transformer main body; 101, core passing groove; 1001, outer stable frame; 1002, insertion rod; 1003, first plug; 102, cable structure; 2, first clamping piece; 201, anti-skid layer; 3, second clamping piece; 301, positioning support; 4, stable structure; 401, second plug; 5, connecting sleeve; 6, stable shaft; 601, end plate; 602, positioning spring; 603, clamping groove; 604, clamping block. DETAILED DESCRIPTION ​

[0035] The utility model will be described in further detail below in conjunction with the drawings.

[0036] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art. The basic principles of the utility model defined in the following description can be used in other embodiments, modification schemes, improvement schemes, equivalent schemes and other technical schemes without departing from the spirit and scope of the utility model.

[0037] Those skilled in the art should understand that, in the disclosure of the utility model, the orientation or position indicated by the terms "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the simplified description of the utility model for the convenience of description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above-mentioned terms cannot be understood as a limitation of the utility model.

[0038] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number. Embodiment

[0039] Please refer to Figures 1-8 A small current transformer convenient to install, comprising a transformer main body 1, a core penetrating groove 101 and a cable structure 102, the core penetrating groove 101 is arranged in the inside of the transformer main body 1, and the core penetrating groove 101 makes the cable structure 102 pass through, a first clamping piece 2 is arranged above the opening of the core penetrating groove 101, a second clamping piece 3 is arranged below the opening of the core penetrating groove 101, a stabilizing structure 4 is arranged in the inside of the first clamping piece 2 and the second clamping piece 3, the stabilizing structure 4 is in contact with the surface of the cable structure 102, and a positioning spring 602 is arranged between the first clamping piece 2 and the second clamping piece 3.

[0040] The small current transformer convenient to install of the application is mainly composed of a transformer main body 1, a core penetrating groove 101, a cable structure 102, a first clamping piece 2, a second clamping piece 3, a stabilizing structure 4, a connecting sleeve 5, a stabilizing shaft 6 and a positioning spring 602, and the following is a detailed structure and working principle.

[0041] Detailed steps of the installation process

[0042] First, the cable structure 102 is carefully aligned with the core slot 101 opening of the mutual inductor body 1, and slowly inserted into the core slot 101. During this process, it is necessary to ensure that the cable structure 102 can pass smoothly, avoiding damage to the cable. This step is the basis of the entire installation, and if the cable cannot pass through the core slot 101 correctly, the subsequent installation will not be able to proceed.

[0043] Next, the second clamping piece 3 is installed on the mutual inductor body 1. During installation, attention should be paid to accurately inserting the insertion rod 1002 on the outer wall of the mutual inductor body 1 into the positioning bracket 301 inside the second clamping piece 3. The insertion rod 1002 has a certain hardness and plays a role in preliminary positioning. Then, the first plug 1003 enters the positioning bracket 301 along with the insertion rod 1002, and the elasticity of the first plug 1003 makes it tightly contact with the inner wall of the positioning bracket 301, generating a large friction force, thereby ensuring that the second clamping piece 3 is stably installed at the opening of the outer wall of the mutual inductor body 1.

[0044] At the same time, the outer stable frame 1001 around the second clamping piece 3 is connected with the outer wall of the mutual inductor body 1. The curvature of the outer stable frame 1001 is matched with the curvature of the outer periphery of the second clamping piece 3, which is like a customized "protective sleeve", further enhancing the stability of the connection between the second clamping piece 3 and the mutual inductor body 1 from the outside, preventing the second clamping piece 3 from shifting during use.

[0045] First clamping piece 2 installation and distance adjustment:

[0046] For the installation of the first clamping piece 2, since the first clamping piece 2 is provided with a slot, and the inner periphery of the slot is glued with a rubber anti-slip layer 201, the operator can hold the first clamping piece 2 inside the slot and pull it up. During this process, attention should be paid to the full contact between the hand and the anti-slip layer 201 to avoid slipping. By pulling up the first clamping piece 2, the distance between the first clamping piece 2 and the second clamping piece 3 can be increased, so that the cable structure 102 can be easily placed in the appropriate position.

[0047] The role of the stable structure 4:

[0048] The rubber stable structure 4 inside the first clamping piece 2 and the second clamping piece 3 is a key component to ensure the stable clamping of the cable. The rubber material itself has a certain flexibility and elasticity, and when it comes into contact with the cable structure 102, it can well fit the surface of the cable.

[0049] The inner surface of the stabilizing structure 4 is designed with convex arcs, which are like a plurality of tiny "claws" to increase the contact area with the cable structure 102. Moreover, the arc surface has anti-skid lines, which further increase the friction. In actual use, when there is current passing through the cable, slight vibration may be generated, and the design of the anti-skid lines and convex arcs can effectively resist such vibration and prevent the first clamping piece 2 and the second clamping piece 3 from loosening on the cable.

[0050] From the perspective of insulation protection, the stabilizing structure 4 made of rubber material plays a crucial role. Without such insulation design, the clamping pieces made of metal material directly contact the cable, which may cause electric leakage in some special cases such as humid environment or slight damage to the cable insulation layer, endangering the safety of equipment and personnel.

[0051] The function of the positioning spring 602:

[0052] The positioning spring 602 is located between the connecting sleeve 5 and the end plate 601 and surrounds the outer shaft of the stabilizing shaft 6. When the first clamping piece 2 and the second clamping piece 3 are closed, the positioning spring 602 is compressed to generate a certain pre-tightening force. This pre-tightening force can ensure that the first clamping piece 2 and the second clamping piece 3 are tightly fitted. Even in the long-term use process, due to environmental factors such as temperature changes, slight vibrations, etc., the clamping pieces may have a slight tendency to loosen, and the pre-tightening force of the positioning spring 602 can timely compensate for such loosening to ensure stable clamping of the cable structure 102.

[0053] The function of the second plug 401:

[0054] The two sides of the stabilizing structure 4 are symmetrically glued with spherical and elastic second plugs 401, which are inserted into the matching slots of the first clamping piece 2 or the second clamping piece 3. This design has great advantages in actual application. When the stabilizing structure 4 is damaged due to long-term use, the spherical and elastic second plugs 401 facilitate the removal of the stabilizing structure 4 from the clamping pieces for replacement. Because of the spherical design, it is easier to operate during insertion and removal, and the elasticity can ensure that the second plug 401 is stably inserted into the slot during normal use and will not easily fall off.

[0055] The cooperation of the connecting sleeve 5 and the stabilizing shaft 6:

[0056] The two sides of the first clamping piece 2 and the second clamping piece 3 are connected with the connecting sleeve 5, and the connecting sleeve 5 internally vertically movably installs the stabilizing shaft 6. The upper and lower ends of the stabilizing shaft 6 are connected with the end plate 601 to limit the movement of the first clamping piece 2.

[0057] When the distance between the first clamping piece 2 and the second clamping piece 3 needs to be adjusted, the operator pulls the first clamping piece 2 upwards, and the first clamping piece 2 drives the connecting sleeve 5 to move relative to the outside of the stabilizing shaft 6. In this process, the connecting sleeve 5 will press the positioning spring 602.

[0058] Due to the presence of the positioning spring 602, when an external force acts on the first clamping piece 2 to pull it upwards, the positioning spring 602 is compressed, storing elastic potential energy. At the same time, the first clamping piece 2 moves away from the second clamping piece 3, thereby increasing the distance between the clamped cable structure 102. This design can adapt to cables of different diameters, increasing the versatility of the current transformer.

[0059] Connection of the clamping block 604 and the clamping groove 603:

[0060] The outer wall of the groove of the stabilizing shaft 6 is connected with the clamping block 604, and the inner part of the end plate 601 is provided with the clamping groove 603. During installation, the clamping block 604 is inserted into the clamping groove 603 along the opening. This design of the clamping block 604 and the clamping groove 603 provides guidance and positioning functions for the connection between the stabilizing shaft 6 and the end plate 601. During assembly, the operator can accurately install the end plate 601 on the stabilizing shaft 6 according to the corresponding relationship between the clamping block 604 and the clamping groove 603. At the same time, the grooves provided on the upper and lower ends of the end plate 601 can allow the end plate 601 to be sleeved on the stabilizing shaft 6, and the interference fixation ensures the stability of the connection. This interference fixation method not only ensures the connection strength, but also avoids the relative displacement between the end plate 601 and the stabilizing shaft 6 during use, ensuring the reliability of the entire structure during adjustment of the distance and normal use.

[0061] II. Working principle

[0062] The miniaturized current transformer works based on the law of electromagnetic induction. When there is current flowing through the cable structure 102, according to Ampere's law, a magnetic field will be generated around the cable. This magnetic field will pass through the core-penetrating groove 101 of the transformer main body 1.

[0063] Although the winding structure is not mentioned in detail in the text, the winding inside the transformer main body 1 will actually sense the changing magnetic field. According to the law of electromagnetic induction, E is the induced electromotive force, N is the number of turns of the winding, and dΦ / dt is the rate of change of magnetic flux.

[0064] Due to the change of the magnetic field generated by the current in the cable in the core-penetrating groove 101, the magnetic flux in the winding changes, thereby generating an induced electromotive force in the winding. This induced electromotive force is proportional to the size of the current in the cable, and by designing appropriate number of turns of the winding, the large current in the cable structure 102 can be converted into a small current signal that can be used by secondary devices such as measurement and protection.

[0065] Multi-component synergy ensures stable installation:

[0066] The stability of the entire current transformer is ensured by the synergy of multiple components. The first and second clamping pieces 2 and 3, as well as the internal stabilizing structure 4, positioning spring 602, connecting sleeve 5, stabilizing shaft 6, and other components work together to ensure that the current transformer can be stably installed on the cable structure 102.

[0067] Stabilizing structure 4 and anti-slip design:

[0068] The rubber material, convex curvature, and anti-slip pattern of the stabilizing structure 4 are key to ensuring tight contact with the cable and preventing slipping. The anti-slip pattern increases the contact points between the rubber and the cable surface, thereby increasing the friction. In actual operating environments, such as in power systems, cable vibrations may occur due to load changes, and this friction can effectively resist the loosening effects of vibrations, ensuring that the first and second clamping pieces 2 and 3 always stably clamp the cable.

[0069] Long-term stability of the positioning spring 602:

[0070] The pre-tightening force provided by the positioning spring 602 plays a crucial role in the long-term use. Under different environmental temperatures, materials have the characteristics of thermal expansion and contraction. For example, in high-temperature environments, metal components may expand, and the elasticity of the positioning spring 602 can adapt to this change by stretching and contracting itself to compensate for possible loosening. Similarly, during long-term use, due to the thermal expansion and contraction of the cable or slight mechanical vibrations, the clamping force between the first and second clamping pieces 2 and 3 may change slightly. The positioning spring 602 can automatically adjust its pre-tightening force according to this change, ensuring that the clamping force always remains within an appropriate range, guaranteeing the stable installation of the current transformer on the cable.

[0071] Structural advantages of the connecting sleeve 5 and stabilizing shaft 6:

[0072] The structural design of the connecting sleeve 5 and stabilizing shaft 6 not only allows adjustment of the distance between the first and second clamping pieces 2 and 3, but also ensures that a stable clamping state is maintained after adjustment. When adjusting the distance, the connecting sleeve 5 moves on the stabilizing shaft 6, which serves as a guide and support. At the same time, the end plate 601 is connected to the stabilizing shaft 6 through the card slot 603 and the clamping block 604, as well as interference fixation, ensuring the stability and reliability of the entire structure during and after adjustment. This structural design allows the current transformer to adapt to cables of different diameters and work stably for a long time after installation.

[0073] It will be understood by those skilled in the art that the embodiments of the present application described above and shown in the drawings are merely for example and do not limit the present application. The purpose of the present application has been fully and effectively achieved. The function and structural principle of the present application have been demonstrated and described in the embodiments, and the embodiments of the present application can have any deformation or modification without departing from the principle.

Claims

1. A miniaturized current transformer that is easy to install, comprising a transformer body (1), a core slot (101), and a cable structure (102), characterized in that: The through-core groove (101) is opened inside the transformer body (1) and the through-core groove (101) allows the cable structure (102) to pass through. A first clamping member (2) is provided above the opening of the through-core groove (101) and a second clamping member (3) is provided below. A stabilizing structure (4) is provided inside both the first clamping member (2) and the second clamping member (3). The stabilizing structure (4) makes contact with the surface of the cable structure (102). A positioning spring (602) is provided between the first clamping member (2) and the second clamping member (3).

2. The miniaturized current transformer for easy installation according to claim 1, characterized in that: The contact surface of the stable structure (4) is provided with an arc, and the arc surface has anti-slip texture.

3. The miniaturized current transformer for easy installation according to claim 1, characterized in that: The stabilizing structure (4) has a second plug (401) symmetrically glued on both sides, and the second plug (401) is inserted into a matching groove of the first clamping member (2) or the second clamping member (3).

4. A miniaturized current transformer for easy installation according to claim 3, characterized in that: The second plug (401) has a spherical design and is flexible.

5. A miniaturized current transformer for easy installation according to claim 1, characterized in that: The first clamping member (2) and the second clamping member (3) are symmetrically designed. Both sides of the first clamping member (2) and the second clamping member (3) are connected to connecting sleeves (5). A corresponding stabilizing shaft (6) is movably installed inside the connecting sleeve (5). The upper and lower ends of the stabilizing shaft (6) are symmetrically provided with end plates (601) for limiting. The positioning spring (602) is correspondingly provided between the connecting sleeve (5) and the end plate (601), and the positioning spring (602) surrounds the outer shaft of the stabilizing shaft (6).

6. A miniaturized current transformer for easy installation according to claim 5, characterized in that: The end plate (601) is provided with grooves at both the upper and lower ends, and the grooves allow the end plate (601) to be fitted onto them.

7. A miniaturized current transformer for easy installation according to claim 5, characterized in that: A locking block (604) is connected to the outer wall of the groove of the stabilizing shaft (6), and a locking groove (603) is opened inside the end plate (601). The locking block (604) is inserted into the groove (603) along the opening.

8. A miniaturized current transformer for easy installation according to claim 1, characterized in that: The second clamping member (3) is internally connected to a positioning bracket (301). The external wall of the transformer body (1) is connected to a plug rod (1002). The other end of the plug rod (1002) is connected to a first plug (1003). The plug rod (1002) and the first plug (1003) are inserted into the interior of the positioning bracket (301).

9. A miniaturized current transformer for easy installation according to claim 1, characterized in that: The second clamping member (3) is provided with an outer stabilizing frame (1001) on its outer periphery, and the outer stabilizing frame (1001) is connected to the outer wall of the transformer body (1).

10. A miniaturized current transformer for easy installation according to claim 1, characterized in that: The first clamping member (2) is provided with a groove, and an anti-slip layer (201) is glued to the inner circumference of the groove.

Images