Short-circuit grounding device for current transformer withstand voltage test

Abstract

The present disclosure relates to a short-circuit grounding device for a current transformer withstand voltage test, comprising a rigid part, a grounding wire, a short-circuit wire, and a plurality of short-circuit magnets, wherein the first ends of the plurality of short-circuit magnets are connected to the rigid part, the second ends of the plurality of short-circuit magnets are respectively used to adsorb corresponding secondary terminals, each short-circuit magnet is electrically connected to the short-circuit wire, the first end of the grounding wire is electrically connected to the short-circuit wire, and the second end of the grounding wire is used for grounding. The short-circuit grounding device provided by the present disclosure is conducive to the operation of the staff in the electric control cabinet with a small space, improves the efficiency of short-circuiting and grounding a plurality of secondary terminals, and is also conducive to avoiding the virtual connection between the short-circuit wire and the secondary terminal, thereby reducing safety hazards.

Description

Technical Field

[0001] The present disclosure relates to the technical field of current transformer withstand voltage test equipment, and in particular, to a short-circuit grounding device for current transformer withstand voltage test. Background Art

[0002] The current transformer is used to convert the current on the primary side with a larger value into the current on the secondary side with a smaller value, so as to facilitate the measurement or protection of equipment. The current transformer has a primary terminal and a secondary terminal. The primary terminal is usually called the "primary winding" or "primary side", which is usually used to connect large current loops, and the secondary terminal is usually called the "secondary winding" or "secondary side", which is usually used to connect measuring instruments, protection devices or other circuits. In order to prevent the high voltage generated by the open circuit of the secondary terminal of the current transformer during the high-voltage pressurization process from causing damage to equipment or personal injury, multiple secondary terminals need to be short-circuited and grounded before the current transformer withstand voltage test begins.

[0003] In the related technology, workers are usually required to manually wind metal wires around multiple secondary terminals and ground one end of the metal wires to achieve short circuit and grounding of multiple secondary terminals. However, since current transformers are usually installed in electric control cabinets with narrow operating space, manual winding of multiple secondary terminals is not only difficult and inefficient, but also may cause a virtual connection between the metal wires and the secondary terminals, posing a great safety hazard. Utility Model Content

[0004] The purpose of the present disclosure is to provide a short-circuit grounding device for a current transformer withstand voltage test, which is beneficial to improving the efficiency of short-circuiting and grounding multiple secondary terminals of the current transformer.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a short-circuit grounding device for a current transformer withstand voltage test, comprising a rigid member, a grounding wire, a short-circuit wire, and a plurality of short-circuit magnets;

[0006] The first ends of the plurality of short-circuit magnets are all connected to the rigid member, and the second ends of the plurality of short-circuit magnets are respectively used to adsorb the secondary terminals of the corresponding current transformers;

[0007] Each of the shorting magnets is electrically connected to the shorting wire;

[0008] The first end of the grounding wire is electrically connected to the short-circuit wire, and the second end of the grounding wire is used for grounding.

[0009] Optionally, the short-circuit grounding device further includes a grounding magnet, which is connected to the second end of the grounding wire and is used to attract a grounded ferromagnetic object.

[0010] Optionally, the short-circuit grounding device further includes a plurality of springs, and the first end of each of the short-circuit magnets is connected to the rigid member via a corresponding spring.

[0011] Optionally, each of the springs is electrically connected to the short-circuit wire, and each of the short-circuit magnets is electrically connected to the short-circuit wire via the corresponding spring.

[0012] Optionally, each of the springs is connected to the short-circuit wire by soldering.

[0013] Optionally, a conical hole is provided at the second end of the short-circuit magnet, and a hole wall of the conical hole is used to contact with an end portion of the secondary terminal.

[0014] Optionally, a cavity is provided inside the rigid member, and the short-circuit wire is accommodated in the cavity;

[0015] The outer surface of the rigid member is formed with a plurality of through holes connected to the cavity, and each of the short-circuit magnets is respectively arranged in the through hole along the axial direction of the corresponding through hole;

[0016] The outer surface of the rigid part is also formed with a wire hole connected to the cavity, the grounding wire is passed through the wire hole, and the first end of the grounding wire is electrically connected to the short-circuit wire.

[0017] Optionally, the rigid member is made of a transparent material.

[0018] Optionally, the number of the short-circuit magnets is at least six, and the six short-circuit magnets are arranged in two rows and three columns, and the distance between every two adjacent short-circuit magnets is 20 mm.

[0019] Optionally, the rigid part has an outer shape of a cuboid, the length of the cuboid is 85 mm to 95 mm, the width of the cuboid is 45 mm to 50 mm, and the height of the cuboid is 9 mm to 11 mm.

[0020] Compared with the method in the related art whereby the staff manually wraps the metal wire around multiple secondary terminals, the multiple short-circuit magnets provided by the present disclosure can be simultaneously moved by the staff by holding a rigid part, so that the multiple short-circuit magnets can be simultaneously adsorbed on the corresponding secondary terminals. After the test is completed, the staff can quickly separate the multiple short-circuit magnets from the corresponding secondary terminals by operating the rigid part. Therefore, the short-circuit grounding device provided by the present disclosure is conducive to the staff to operate in the electric control cabinet with a small space, improves the efficiency of short-circuiting and grounding multiple secondary terminals, and is also conducive to avoiding the virtual connection between the short-circuit wire and the secondary terminal, reducing safety hazards.

[0021] Furthermore, since the short-circuit wire is not directly connected to the secondary terminal, the short-circuit wire is less pulled during the separation of the short-circuit magnet and the secondary terminal, which helps to avoid the short-circuit wire being left on the secondary terminal. In particular, when a current transformer whose secondary terminal is a terminal bolt (such as LZZBJ9-10 current transformer) is subjected to a withstand voltage test, the short-circuit grounding device provided by the present invention is used. Since there is no need to wrap the short-circuit wire around the thread of the terminal bolt, it is possible to avoid the short-circuit wire being left on the terminal bolt.

[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of a short-circuit grounding device provided in one embodiment of the present disclosure;

[0025] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of a rigid component of a short-circuit grounding device provided in one embodiment of the present disclosure.

[0027] Description of Reference Numerals

[0028] 10-rigid part; 11-cavity; 12-through hole; 13-wire hole; 20-grounding wire; 30-short-circuit wire; 40-short-circuit magnet; 41-conical hole; 50-grounding magnet; 60-spring. DETAILED DESCRIPTION

[0029] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0030] In the present disclosure, unless otherwise stated, the directional words used, such as "upper, lower, top, bottom", are usually defined in terms of the drawing direction of the corresponding drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present disclosure. "Inside and outside" refer to the inside and outside of the corresponding component outline. In addition, the terms "first", "second", etc., are used to distinguish one element from another, and do not have order and importance.

[0031] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0032] like Figures 1 to 3 As shown, the present disclosure provides a short-circuit grounding device for a current transformer withstand voltage test, comprising a rigid member 10, a grounding wire 20, a short-circuit wire 30 and a plurality of short-circuit magnets 40, wherein the first ends of the plurality of short-circuit magnets 40 are connected to the rigid member 10, and the second ends of the plurality of short-circuit magnets 40 are respectively used to adsorb the corresponding secondary terminals of the current transformer, each short-circuit magnet 40 is electrically connected to the short-circuit wire 30, the first end of the grounding wire 20 is electrically connected to the short-circuit wire 30, and the second end of the grounding wire 20 is used for grounding.

[0033] Through the above technical solution, since the first ends of the multiple short-circuiting magnets 40 are all connected to the rigid part 10, and each short-circuiting magnet 40 is electrically connected to the short-circuiting wire 30, before the start of the voltage withstand test, the staff can move the multiple short-circuiting magnets 40 to the multiple secondary terminals of the current transformer at the same time by holding the rigid part 10, and through the magnetic attraction of the short-circuiting magnets 40, the second ends of the multiple short-circuiting magnets 40 are respectively adsorbed to the corresponding secondary terminals, and the short-circuiting of the multiple secondary terminals is achieved through the short-circuiting wire 30. At this time, the staff can ground the second end of the grounding wire 20 to ground the multiple secondary terminals in sequence through the short-circuiting magnets 40, the short-circuiting wire 30 and the grounding wire 20.

[0034] Compared with the method in the related art where the staff manually wraps the metal wire around multiple secondary terminals, the multiple short-circuit magnets 40 provided by the present disclosure can be moved simultaneously by the staff by holding the rigid part 10, so that the multiple short-circuit magnets 40 can be simultaneously adsorbed on the corresponding secondary terminals. After the test is completed, the staff can quickly separate the multiple short-circuit magnets 40 from the corresponding secondary terminals by operating the rigid part 10. Therefore, the short-circuit grounding device provided by the present disclosure is conducive to the staff to operate in the electric control cabinet with a small space, improves the efficiency of short-circuiting and grounding multiple secondary terminals, and is also conducive to avoiding the virtual connection between the short-circuit wire 30 and the secondary terminal, reducing safety hazards.

[0035] Furthermore, since the short-circuit wire 30 is not directly connected to the secondary terminal, the short-circuit wire 30 is less pulled during the separation of the short-circuit magnet 40 from the secondary terminal, thereby helping to avoid the short-circuit wire 30 being left on the secondary terminal. In particular, when a current transformer whose secondary terminal is a terminal bolt (such as LZZBJ9-10 type current transformer) is subjected to a withstand voltage test, the short-circuit grounding device provided by the present invention is used. Since there is no need to wrap the short-circuit wire 30 around the thread of the terminal bolt, it is possible to avoid the short-circuit wire 30 being left on the terminal bolt.

[0036] It is understandable that the shorting magnet 40 can be any type of magnet as long as it can attract ferromagnetic objects, and the present disclosure does not limit this. In addition, the shorting wire 30 and the grounding wire 20 can be copper wires or lead wires as long as they have good electrical conductivity, and the present disclosure does not limit this.

[0037] In order to improve the grounding efficiency of multiple secondary terminals, as an implementation method, Figure 1 As shown, the short-circuit grounding device also includes a grounding magnet 50, which is connected to the second end of the grounding wire 20 and is used to absorb a grounded ferromagnetic object. By absorbing the grounding magnet 50 to a grounded ferromagnetic object (such as a grounding flat iron, a metal cabinet of an electric control cabinet, etc.), the grounding of the grounding wire 20 can be achieved, thereby greatly improving the efficiency of grounding multiple secondary terminals and facilitating the grounding reliability of the grounding wire 20.

[0038] It is understandable that the grounding magnet 50 can be any type of magnet as long as it can attract ferromagnetic objects, and the present disclosure does not limit this.

[0039] Alternatively, if Figure 1 and Figure 2 As shown, the short-circuit grounding device further includes a plurality of springs 60, and the first end of each short-circuit magnet 40 is connected to the rigid member 10 through the corresponding spring 60. Since the spring 60 has elastic expansion and contraction capability, the short-circuit magnet can approach the rigid member 10 by compressing the spring 60 when being pressed against by the secondary terminal, and the short-circuit magnet can be pulled away from the rigid member 10 by stretching the spring 60 when being attracted by the secondary terminal. Therefore, the plurality of short-circuit magnets can adsorb a plurality of secondary terminals of different heights, and are conducive to ensuring a good connection between each short-circuit magnet and its corresponding secondary terminal.

[0040] The shorting magnet 40 can be directly electrically connected to the shorting wire 30, or can be indirectly electrically connected to the shorting wire 30 through other structures, which is not limited in the present disclosure. As an implementation method, Figure 1As shown, each spring 60 is electrically connected to the short-circuit wire 30 , and each short-circuit magnet 40 is electrically connected to the short-circuit wire 30 through the corresponding spring 60 , which helps to reduce the pulling of the short-circuit wire 30 during the movement of the short-circuit magnet 40 .

[0041] The spring 60 can be connected to the short-circuit wire 30 in any suitable manner, and the present disclosure does not limit this. As an embodiment, each spring 60 can be connected to the short-circuit wire 30 by soldering, which is not only beneficial to avoid friction between the spring 60 and the short-circuit wire 30 during deformation, but also beneficial to avoid virtual connection between the spring 60 and the short-circuit wire 30.

[0042] As another embodiment of the present disclosure, the short wire 30 may be electrically connected to each spring 60 by winding.

[0043] Alternatively, if Figure 2 As shown, the second end of the shorting magnet 40 is provided with a tapered hole 41, and the hole wall of the tapered hole 41 is used to contact the end of the secondary terminal. When the shorting magnet 40 adsorbs the secondary terminal with a spherical end, the hole wall of the tapered hole 41 can make line contact with the spherical surface of the end of the secondary terminal, which is beneficial to improve the reliability of the connection between the shorting magnet 40 and the secondary terminal.

[0044] In the present disclosure, as an embodiment, Figures 1 to 3 As shown, a cavity 11 is provided inside the rigid member 10, and the short-circuit wire 30 is accommodated in the cavity 11. A plurality of through holes 12 connected to the cavity 11 are formed on the outer surface of the rigid member 10, and each short-circuit magnet 40 is respectively arranged in the through hole 12 along the axial direction of the corresponding through hole 12. A wire hole 13 connected to the cavity 11 is also formed on the outer surface of the rigid member 10, and the grounding wire 20 is passed through the wire hole 13, and the first end of the grounding wire 20 is electrically connected to the short-circuit wire 30.

[0045] By accommodating the short-circuit wire 30 in the cavity 11 , the short-circuit wire 30 can be protected by the rigid member 10 , thereby preventing the short-circuit wire 30 from being worn and broken, thereby facilitating improving the reliability and life of the short-circuit grounding device.

[0046] In the embodiment where the first end of each shorting magnet 40 is connected to the rigid member 10 via a corresponding spring 60 , the spring 60 may also be accommodated in the cavity 11 so that the spring 60 is also protected by the rigid member 10 .

[0047] Optionally, the rigid member 10 may be made of a transparent material, so that the staff can observe the situation in the cavity 11 through the rigid member 10 , which facilitates the staff to check the connection between the short-circuit wire 30 and each short-circuit magnet 40 .

[0048] In the present disclosure, the number, arrangement and spacing of the multiple short-circuit magnets 40 can be designed according to actual conditions. As an implementation method, Figure 1 As shown, the number of short-circuit magnets 40 is at least six, and the six short-circuit magnets 40 are arranged in two rows and three columns, and the spacing between each two adjacent short-circuit magnets 40 is 20 mm. In this way, the number, arrangement and spacing of the multiple short-circuit magnets 40 can correspond to the number, arrangement and spacing of the multiple secondary terminals of the LZZBJ9-10 type current transformer. That is to say, when the LZZBJ9-10 type current transformer is subjected to a withstand voltage test, the short-circuit grounding device provided by the present disclosure can be used to efficiently and reliably short-circuit and ground the multiple secondary terminals of the current transformer.

[0049] Alternatively, if Figure 1 and Figure 3 As shown, the outer shape of the rigid part 10 is a rectangular parallelepiped, the length of the rectangular parallelepiped is 85mm-95mm, the width of the rectangular parallelepiped is 45mm-50mm, and the height of the rectangular parallelepiped is 9mm-11mm. The rectangular rigid part 10 is easy to make, and the length, width and height of the rectangular parallelepiped are the above values, which is conducive to the staff to grasp it with one hand, and on the other hand, it can make the rectangular parallelepiped have a more conspicuous size, avoiding the staff to forget to remove it after completing the withstand voltage test on the current transformer. Especially when performing a withstand voltage test on the LZZBJ9-10 type current transformer, the length and width of the rectangle are the above values, which is also conducive to avoiding interference between the rigid part 10 and the current transformer.

[0050] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0051] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0052] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A short-circuit grounding device for current transformer withstand voltage test, characterized in that: It includes a rigid part, a grounding wire, a short-circuit wire, and a plurality of short-circuit magnets; The first ends of the plurality of short-circuit magnets are all connected to the rigid member, and the second ends of the plurality of short-circuit magnets are respectively used to adsorb the secondary terminals of the corresponding current transformers; Each of the shorting magnets is electrically connected to the shorting wire; The first end of the grounding wire is electrically connected to the short-circuit wire, and the second end of the grounding wire is used for grounding.

2. The short-circuit grounding device for current transformer withstand voltage test according to claim 1, characterized in that: The short-circuit grounding device also includes a grounding magnet, which is connected to the second end of the grounding wire and is used to attract a grounded ferromagnetic object.

3. The short-circuit grounding device for current transformer withstand voltage test according to claim 1, characterized in that: The short-circuit grounding device further includes a plurality of springs, and the first end of each of the short-circuit magnets is connected to the rigid member via a corresponding spring.

4. The short-circuit grounding device for current transformer withstand voltage test according to claim 3, characterized in that: Each of the springs is electrically connected to the short-circuit wire, and each of the short-circuit magnets is electrically connected to the short-circuit wire through the corresponding spring.

5. The short-circuit grounding device for current transformer withstand voltage test according to claim 4, characterized in that: Each of the springs is connected to the short-circuit wire by soldering.

6. The short-circuit grounding device for current transformer withstand voltage test according to claim 1, characterized in that: A tapered hole is provided at the second end of the short-circuit magnet, and a hole wall of the tapered hole is used to contact the end of the secondary terminal.

7. The short-circuit grounding device for current transformer withstand voltage test according to any one of claims 1 to 6, characterized in that: The rigid member is provided with a cavity inside, and the short-circuit wire is accommodated in the cavity; The outer surface of the rigid member is formed with a plurality of through holes connected to the cavity, and each of the short-circuit magnets is respectively arranged in the through hole along the axial direction of the corresponding through hole; The outer surface of the rigid part is also formed with a wire hole connected to the cavity, the grounding wire is passed through the wire hole, and the first end of the grounding wire is electrically connected to the short-circuit wire.

8. The short-circuit grounding device for current transformer withstand voltage test according to claim 7, characterized in that: The rigid part is made of transparent material.

9. The short-circuit grounding device for current transformer withstand voltage test according to claim 7, characterized in that: The number of the short-circuit magnets is at least six, and the six short-circuit magnets are arranged in two rows and three columns, and the distance between every two adjacent short-circuit magnets is 20 mm.

10. The short-circuit grounding device for current transformer withstand voltage test according to claim 7, characterized in that: The rigid part has a rectangular parallelepiped shape, the length of the rectangular parallelepiped is 85 mm to 95 mm, the width of the rectangular parallelepiped is 45 mm to 50 mm, and the height of the rectangular parallelepiped is 9 mm to 11 mm.

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