Tandem current transformer and high-voltage motor control cabinet

Abstract

The utility model relates to the technical field of high-voltage motor on-line monitoring, in particular to a series connection type current transformer, a high-voltage motor control cabinet and a first mutual inductance mechanism, which comprise an open type current transformer, an opening arranged on the open type current transformer and a connecting part arranged on the open type current transformer. The second mutual inductance mechanism comprises a perforated current transformer and a detection part arranged on the perforated current transformer; the connecting mechanism comprises a penetrating part and a receiving part which are arranged on the connecting part; the storage mechanism comprises a storage box, a fixing part arranged on the storage box and a storage part arranged in the storage box; the control mechanism comprises a control cabinet body, a signal part and a protection part, the signal part and the protection part are arranged on the control cabinet body, and according to the series connection type current transformer and the high-voltage motor control cabinet, the open type current transformer and the perforated type current transformer are connected in series, and signals are transmitted to the intelligent sensing terminal; the problem that the measuring terminal cannot be matched with the output wire diameter of the high-voltage power transformer is solved.

Description

Technical Field

[0001] This application relates to the technical field of online monitoring of high-voltage motors, and in particular to series current transformers and high-voltage motor control cabinets. Background Technology

[0002] With the development of modern industry, the number and capacity of motors in industrial production systems are increasing. Large high-voltage motors have wide applications and play a crucial role; their operational reliability is extremely important for the safe and efficient operation of the manufacturing process. High-voltage motors are affected by various factors during long-term operation, causing physical and chemical changes in the internal insulation materials, leading to decreased insulation performance, structural aging, and even breakdown. Failures not only damage the motor but also affect the production system and personnel safety. Online condition monitoring of important large high-voltage motors can reduce failure rates and losses, creating conditions for condition-based maintenance. Approximately half of motor failures are caused by stator winding insulation damage; insulation aging is the main cause of stator bar insulation failures, while abnormal insulation resistance is a symptom.

[0003] Online monitoring of relevant parameters can determine the degree of insulation aging and diagnose and warn of potential faults, promoting the transformation of high-voltage electrical equipment maintenance. In recent years, online monitoring technology for motor insulation has developed rapidly. Although technical challenges remain, and some tests cannot be performed during operation, new methods and equipment have created conditions for diagnosis and identification. Furthermore, due to significant size differences between the measuring terminals and motor wiring in high-voltage motor monitoring systems, direct connection is difficult under the constraints of current transformer specifications. Disassembly of the wiring harness after connection is also inconvenient. Traditional monitoring systems cannot adjust the output line length according to the location of the measuring terminals, making installation inconvenient. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the existing problems of the measurement terminal and motor wiring being difficult to connect directly due to large size differences, the output wire length being difficult to adjust, the wiring harness being inconvenient to disassemble after wiring, the control cabinet generating a lot of heat inside, and the control cabinet not having lightning protection, this application is proposed.

[0006] Therefore, the purpose of this utility model is to provide a series current transformer, which aims to achieve smooth connection between the measuring terminal with large size difference and the motor wiring, and to facilitate the disassembly of the wiring harness and adjustment of the output wire length after wiring.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: including,

[0008] The first current transformer mechanism includes an open-type current transformer, an opening provided on the open-type current transformer, and a connection part provided on the open-type current transformer.

[0009] The second current transformer mechanism includes a perforated current transformer, a detection part disposed on the perforated current transformer, the detection part including a secondary output line disposed on the perforated current transformer, and a perforation disposed on the perforated current transformer and connected to the connection part.

[0010] The connecting mechanism includes an insert portion disposed on the connecting portion and a receiving portion disposed on the connecting portion;

[0011] The storage mechanism includes a storage box disposed on the detection unit, a fixing part disposed on the storage box, and a storage part disposed inside the storage box.

[0012] In a preferred embodiment of the series current transformer of this utility model, the connecting part includes an output line one disposed on the open-type current transformer and an output line two disposed on the open-type current transformer.

[0013] In a preferred embodiment of the series current transformer of this utility model, the insertion part includes an insertion shell disposed on the first output line and a threaded rod disposed on the insertion shell.

[0014] In a preferred embodiment of the series current transformer of this utility model, the insertion part further includes a conductive post disposed inside the insertion shell and connected to the output line.

[0015] In a preferred embodiment of the series current transformer of this utility model, the receiving part includes a receiving shell disposed on the second output line and connected to the through shell, a threaded groove disposed on the receiving shell and connected to the threaded rod, and a conductive sleeve disposed inside the receiving shell and connected to the second output line. The conductive sleeve is configured to cooperate with the conductive post.

[0016] In a preferred embodiment of the series current transformer of this utility model, the fixing part includes a conduit disposed on the storage box and an opening plate disposed on the storage box.

[0017] In a preferred embodiment of the series current transformer of this utility model, the storage part includes a rotating shaft disposed in the storage box, a storage shaft disposed on the rotating shaft, and the secondary output line disposed on the storage shaft.

[0018] In actual use, there is still a problem of excessive heat generation inside the control cabinet.

[0019] To solve the above-mentioned technical problems, this utility model also provides the following technical solution: a high-voltage motor control cabinet, characterized in that it includes a series-connected current transformer, and...

[0020] The control mechanism includes a control cabinet body, a signal unit disposed on the control cabinet body, and a protection unit disposed inside the control cabinet body.

[0021] In a preferred embodiment of the high-voltage motor control cabinet of this utility model, the signal unit includes a touch display mounted on the control cabinet body and an intelligent sensing terminal mounted inside the control cabinet body and connected to the secondary output line.

[0022] In a preferred embodiment of the high-voltage motor control cabinet of this utility model, the protection unit includes a lightning protection module disposed within the control cabinet body and a cooling fan disposed within the control cabinet body.

[0023] The beneficial effects of this utility model are as follows: By connecting an open-type current transformer to a high-voltage line and outputting the measured primary signal, the open-type current transformer is connected in series with a through-type current transformer to transmit the secondary signal to the intelligent sensing terminal. Due to the cooperative arrangement of the open-type current transformer and the through-type current transformer, the voltage and wire hole are matched during the two conversion processes, and the signal of the high-voltage line is measured by the intelligent sensing terminal. This solves the problem that the measuring terminal cannot match the output wire diameter of the high-voltage power transformer, and provides convenience for operators to connect wires.

[0024] By rotating the connecting mechanism, the insert shell separates from the receiving shell, at which point the conductive post disengages from the conductive sleeve. Then, the output wire one and output wire two are unscrewed respectively, achieving quick disassembly of the connecting wire harness and improving the practicality of the device.

[0025] By incorporating a storage mechanism, the rotating shaft can be used to store secondary output lines, preventing excessively long secondary output lines from causing a messy overall wiring layout in the electrical cabinet and improving the work efficiency of staff. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0027] Figure 1This is a schematic diagram of the overall structure of the series current transformer and high-voltage motor control cabinet of this utility model.

[0028] Figure 2 This is a schematic diagram of the overall structure of the series current transformer and high-voltage motor control cabinet of this utility model.

[0029] Figure 3 This is a schematic diagram of the overall structure of the series current transformer and the high-voltage motor control cabinet connection mechanism of this utility model.

[0030] Figure 4 This is a schematic diagram of the connection process of the series current transformer and the high-voltage motor control cabinet connection mechanism of this utility model.

[0031] Figure 5 This is a schematic diagram of the internal structure of the series current transformer and the high-voltage motor control cabinet connection mechanism of this utility model.

[0032] Figure 6 This is a schematic diagram of the overall structure of the series current transformer and the high-voltage motor control cabinet storage mechanism of this utility model.

[0033] Figure 7 This is a schematic diagram of the internal structure of the series current transformer and the high-voltage motor control cabinet storage mechanism of this utility model. Detailed Implementation

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0037] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0038] Example 1, referring to 1-7, is the first embodiment of this utility model, providing a series current transformer. This device includes...

[0039] The first current transformer mechanism 100 includes an open-type current transformer 101, an opening 102 disposed on the open-type current transformer 101, and a connecting portion 103 disposed on the open-type current transformer 101. The current ratio of the open-type current transformer 101 is 100A / 5A. The opening 102 and the open-type current transformer 101 are integrally designed. The opening 102 allows the transformer to be easily secured to the primary circuit conductors without disconnecting them during installation. The opening typically has a reliable fastening device, usually consisting of bolts, nuts, or special clamps. After the transformer is installed on the primary circuit, the fastening device can tightly close the opening, ensuring that the transformer core can form a complete magnetic circuit.

[0040] The second current transformer mechanism 200 includes a perforated current transformer 201 and a detection unit 202 disposed on the perforated current transformer 201; the perforated current transformer 201 adopts a 0-5A to 0-10V power supply voltage of 24V.

[0041] The detection unit 202 includes a secondary output line 202a fixedly mounted on a perforated current transformer 201, and a perforation 202b mounted on the perforated current transformer 201 and connected to the connection part 103. The diameter of the perforation 202b is 4mm. The output end of the secondary output line 202a is electrically connected to the terminal, and the first output line 103a passes around the perforation 202b at least once before being electrically connected to the second output line 103b.

[0042] The connecting mechanism 300 includes an insert portion 301 disposed on the connecting portion 103 and a receiving portion 302 disposed on the connecting portion 103; the insert portion 301 and the receiving portion 302 are connected.

[0043] The storage mechanism 400 includes a storage box 401 disposed on the detection unit 202, a fixing part 402 disposed on the storage box 401, and a storage part 403 disposed inside the storage box 401.

[0044] In this project, a three-phase high-voltage motor with a power of up to 450KW and a current of 32A is used. Therefore, the wire diameter for its wiring is relatively thick. Moreover, due to the large number of functional components on its wiring and the industry regulations for high-voltage wires, it is not easy to remove the wire after it is connected. The open-type current transformer 101 with a current ratio of 100A / 5A, specifically model JCKCT50, has a primary input wire diameter and connector size of 40mm and a secondary output of 1mm. It can be directly connected without removing the three-phase high-voltage cable. Since the voltage of the acquisition device is 0-10V, its wiring area is 0.75mm2, which leads to a mismatch between the two. Therefore, a perforated current transformer 201 is connected in series. The output wire of the open-type current transformer 101 passes through it, and the secondary output wire of the perforated current transformer 201 matches the wire hole of the intelligent receiver.

[0045] During use, the open-type current transformer 101 is snapped onto the three-phase high-voltage cable through the opening 102, and the connection part 103 is connected to the detection part 202. The high-voltage motor control cabinet outside the detection part 202 is then connected to obtain the measured data.

[0046] After the connecting part 103 is connected to the detection part 202, the connection between the insert part 301 and the receiving part 302 facilitates the disassembly of the connecting part 103.

[0047] Due to space constraints during actual installation, the installation positions of the perforated current transformer 201 and the open current transformer 101 are not fixed. Therefore, the detection unit 202 is relatively long. In order to prevent the output line from being too long and causing the overall wiring of the electrical cabinet to be too messy, the detection unit 202 can be stored according to the position of the measuring terminal by rotating the storage unit 403.

[0048] Example 2, refer to Figures 1-7 This is the second embodiment of the present invention. This embodiment differs from the first embodiment in that the connecting part 103 includes an output line 103a fixedly disposed on the open-type current transformer 101, and an output line 103b fixedly disposed on the open-type current transformer 101. Both output line 103a and output line 103b are electrically connected to the open-type current transformer 101.

[0049] To improve anti-interference performance, output line 103a and output line 103b are twisted together. By twisting them in a spiral shape to form a twisted wire, the two wires are restricted from each other, reducing the chance of relative displacement. This ensures that the number of turns of one of the output lines wound in the perforated current transformer 201 is stable, and secondly, it improves anti-interference capability.

[0050] The insertion part 301 includes an insertion shell 301a disposed on the output line 103a, a threaded rod 301b fixedly disposed on the insertion shell 301a, and a conductive post 301c disposed inside the insertion shell 301a and connected to the output line 103a. The conductive post 301c is fixedly connected to the insertion shell 301a. The conductive post 301c is provided with a threaded hole. The output line 103a is threadedly connected to the conductive post 301c. The conductive post 301c is made of conductive material. The output line 103a is electrically connected to the conductive post 301c.

[0051] The receiving unit 302 includes a receiving shell 302a disposed on the output line 2 103b and connected to the insertion shell 301a, a threaded groove 302b disposed on the receiving shell 302a and threadedly connected to the threaded rod 301b, and a conductive sleeve 302c fixedly disposed inside the receiving shell 302a and connected to the output line 2 103b. The conductive sleeve 302c is configured to cooperate with the conductive post 301c. After the conductive post 301c is inserted into the conductive sleeve 302c, it is electrically connected to it. The conductive sleeve 302c is provided with a threaded hole. The output line 2 103b is threadedly connected to the conductive sleeve 302c. The conductive sleeve 302c is made of conductive material. The output line 2 103b is electrically connected to the conductive sleeve 302c.

[0052] The fixing part 402 includes a wire conduit 402a fixedly disposed on the storage box 401, an opening plate 402b disposed on the storage box 401, a secondary output line 202a passing through the two wire conduits 402a, and the opening plate 402b being snap-fitted and fixedly connected to the storage box 401.

[0053] The storage unit 403 includes a rotating shaft 403a disposed in the storage box 401, a storage shaft 403b fixedly disposed on the rotating shaft 403a, a secondary output line 202a disposed on the storage shaft 403b, and one end of the secondary output line 202a fixedly connected to the storage shaft 403b.

[0054] During use, the opening 102 of the open-type current transformer 101 is directly connected to the high-voltage cable. After the output line 103a and the output line 103b are electrically connected, the detected signal is converted by the perforated current transformer 201 and connected to the intelligent receiver through the secondary output line 202a on the perforated current transformer 201.

[0055] Output line 103a is threaded onto the conductive post 301c after passing through the through hole 202b at least once. Output line 203b is threaded onto the conductive sleeve 302c. The conductive post 301c is inserted into the conductive sleeve 302c and electrically connected to it. The through shell 301a is rotated and threaded onto the threaded groove 302b, which facilitates the disassembly of output line 103a and output line 203b.

[0056] Rotate the rotating shaft 403a, and the secondary output line 202a will be wound around the storage shaft 403b. Adjust the length of one side of the secondary output line 202a according to the position of the intelligent receiver. If it needs to be extended, simply pull out part of the wound secondary output line 202a to prevent the secondary output line 202a from being too long and causing the overall wiring of the electrical cabinet to be too messy.

[0057] Example 3, referring to Figures 1-2 This is the third embodiment of the present invention, which differs from the second embodiment in that it provides a high-voltage motor control cabinet, which includes a series-connected current transformer, and...

[0058] The control mechanism 500 includes a control cabinet body 501, a signal unit 502 fixedly installed on the control cabinet body 501, and a protection unit 503 fixedly installed inside the control cabinet body 501.

[0059] The signal unit 502 includes a touch display 502a fixedly mounted on the control cabinet body 501, and an intelligent sensing terminal 502b fixedly mounted inside the control cabinet body 501 and connected to the secondary output line 202a.

[0060] The protection unit 503 includes a surge protection module 503a fixedly installed inside the control cabinet body 501, and a cooling fan 503b fixedly installed inside the control cabinet body 501. The surge protection module 503a protects and improves the safe operation of the electrical cabinet, while the cooling fan 503b improves the operational stability of the electrical cabinet.

[0061] During use, the secondary output line 202a is electrically connected to the intelligent sensing terminal 502b, and the intelligent sensing terminal 502b is communicatively connected to the touch display 502a. After the perforated current transformer 201 measures the signal of the open current transformer 101, it transmits the signal to the intelligent sensing terminal 502b through the secondary output line 202a and displays it on the touch display 502a. The control cabinet body 501 is equipped with a power supply and controller to ensure operation.

[0062] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0063] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to the implementation of the present invention) may be omitted.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A series-connected current transformer, characterized in that: include, The first current transformer mechanism (100) includes an open-type current transformer (101), an opening (102) provided on the open-type current transformer (101), and a connecting part (103) provided on the open-type current transformer (101). The second current transformer mechanism (200) includes a perforated current transformer (201) and a detection unit (202) disposed on the perforated current transformer (201). The detection unit (202) includes a secondary output line (202a) disposed on the perforated current transformer (201) and a perforation (202b) disposed on the perforated current transformer (201) and connected to the connection part (103). The connecting mechanism (300) includes an insertion part (301) disposed on the connecting part (103) and a receiving part (302) disposed on the connecting part (103). The storage mechanism (400) includes a storage box (401) disposed on the detection unit (202), a fixing part (402) disposed on the storage box (401), and a storage part (403) disposed inside the storage box (401).

2. The series current transformer according to claim 1, characterized in that: The connection part (103) includes an output line one (103a) disposed on the open-type current transformer (101) and an output line two (103b) disposed on the open-type current transformer (101).

3. The series current transformer according to claim 2, characterized in that: The insertion part (301) includes an insertion shell (301a) disposed on the output line (103a) and a threaded rod (301b) disposed on the insertion shell (301a).

4. The series current transformer according to claim 3, characterized in that: The insertion part (301) further includes a conductive post (301c) disposed inside the insertion shell (301a) and connected to the output line (103a).

5. The series current transformer according to claim 4, characterized in that: The receiving part (302) includes a receiving shell (302a) disposed on the second output line (103b) and connected to the insertion shell (301a), a threaded groove (302b) disposed on the receiving shell (302a) and connected to the threaded rod (301b), and a conductive sleeve (302c) disposed inside the receiving shell (302a) and connected to the second output line (103b). The conductive sleeve (302c) is configured to cooperate with the conductive post (301c).

6. The series current transformer according to any one of claims 1 to 5, characterized in that: The fixing part (402) includes a wire conduit (402a) disposed on the storage box (401) and an opening plate (402b) disposed on the storage box (401).

7. The series current transformer according to claim 5, characterized in that: The storage section (403) includes a rotating shaft (403a) disposed in the storage box (401), a storage shaft (403b) disposed on the rotating shaft (403a), and the secondary output line (202a) disposed on the storage shaft (403b).

8. A high-voltage motor control cabinet, characterized in that: Includes the series current transformer as described in any one of claims 1, 2, 3, 4, 5, or 7, and, The control mechanism (500) includes a control cabinet body (501), a signal unit (502) disposed on the control cabinet body (501), and a protection unit (503) disposed inside the control cabinet body (501).

9. The high-voltage motor control cabinet according to claim 8, characterized in that: The signal unit (502) includes a touch display (502a) disposed on the control cabinet body (501) and an intelligent sensing terminal (502b) disposed inside the control cabinet body (501) and connected to the secondary output line (202a).

10. The high-voltage motor control cabinet according to claim 8, characterized in that: The protection unit (503) includes a lightning protection module (503a) installed in the control cabinet body (501) and a cooling fan (503b) installed in the control cabinet body (501).

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