Isolation type mutual inductor tester

Abstract

The utility model belongs to the technical field of testers, and particularly discloses an isolation type mutual inductor tester which comprises a shell, a panel and an electric appliance element, the electric appliance element is installed in the shell, the panel is located at the top of the shell, the panel is provided with a plurality of interfaces, plugs are installed in the interfaces, and the electric appliance element is installed in the shell. The plug is connected with the electric appliance element through a cable, an isolation hood is further arranged in the shell, the electric appliance element is located in the isolation hood, the isolation hood comprises a bottom plate, a plurality of side plates and a top plate, the bottom plate is located at the bottom of the shell, the plurality of side plates enclose to form a frame structure, and the top plate is located at the bottom of the shell. The bottom ends of the plurality of side plates are all detachably connected with the bottom plate, the top ends of the plurality of side plates are all connected with the top plate, and the top plate is provided with cable holes sequentially corresponding to the plurality of interfaces on the panel. The tester can be prevented from being interfered by an external magnetic field during use, and the accuracy of a test result of the tester is improved.

Description

Technical Field

[0001] This utility model relates to the field of testing instrument technology, specifically to an isolated current transformer tester. Background Technology

[0002] In power systems, instrument transformers are indispensable equipment, and their metering accuracy directly affects the safety, stability, and fairness of electricity trading. Therefore, it is necessary to periodically test the errors of instrument transformers. However, because it is difficult to disassemble and send in-use instrument transformers for laboratory verification, and the on-site verification environment does not meet the requirements of traditional verification procedures, many instrument transformers operate beyond their verification period, posing safety hazards and regulatory challenges.

[0003] To address the aforementioned issues, existing technologies have developed specialized instrument testing equipment for on-site testing of instrument transformers. Currently, instrument testing equipment includes voltage transformer testing equipment, current transformer testing equipment, and integrated capacitive and electromagnetic transformer testing equipment. However, existing testing equipment does not incorporate a shielding structure, making it susceptible to interference from external magnetic fields during use, which affects the accuracy of the test results. Utility Model Content

[0004] This utility model provides an isolated current transformer tester, which aims to avoid interference from external magnetic fields during use and improve the accuracy of the test results.

[0005] This utility model is achieved through the following technical solution: an isolated current transformer tester includes a housing, a panel, and electrical components. The electrical components are installed inside the housing. The panel is located at the top of the housing and has multiple interfaces. Plugs are installed in the interfaces and connected to the electrical components via cables. An isolation cover is also provided inside the housing, and the electrical components are located inside the isolation cover. The isolation cover includes a bottom plate, side plates, and a top plate. The bottom plate is located at the bottom of the housing. Multiple side plates are provided, forming a frame structure. The bottom ends of the multiple side plates are detachably connected to the bottom plate, and the top ends of the multiple side plates are connected to the top plate. Cable holes corresponding sequentially to the multiple interfaces on the panel are provided on the top plate.

[0006] Compared with existing technologies, this solution has the following advantages and beneficial effects:

[0007] In this design, an isolation cover is installed inside the outer casing, and the electrical components are located inside the isolation cover. This can shield and isolate the electrical components, thereby preventing the tester from being interfered with by external magnetic fields during use, and thus improving the accuracy of the test results.

[0008] In addition, the isolation cover in this solution includes a base plate, side plates, and a top plate. The base plate and side plates are detachably connected, which makes the assembly process more convenient. Simply install the base plate at the bottom of the housing first, then assemble it from the outside. Connect the side plates and top plate and connect the plugs in the interface of the panel to the electrical components through cables. Then, detach the side plates and base plate, thus achieving the function of quick assembly of the isolation cover. Compared with setting the isolation cover as a whole, this solution detachably connects the base plate and side plates, which is convenient for assembly and also convenient for disassembly to inspect and maintain the electrical components inside the isolation cover.

[0009] Furthermore, the top of the base plate is connected to multiple locking blocks, and multiple side plates are provided with locking slots that engage with the multiple locking blocks respectively.

[0010] Beneficial effects: In this solution, the base plate and side plate are detachably connected by the engagement of the locking blocks and slots, which makes the assembly of the two simpler and faster.

[0011] Furthermore, the bottom of the slot is provided with a tapered flare.

[0012] Beneficial effects: The tapered flare can guide the engagement between the card block and the card slot, making the positioning and engagement between the card block and the card slot more accurate, and enabling the card block to be inserted into the card slot more quickly.

[0013] Furthermore, the bottom wall of the outer shell is connected to a positioning post, and a through hole is provided on the bottom plate, with the through hole on the bottom plate fitting onto the positioning post.

[0014] Beneficial effects: The positioning pins connected to the bottom of the outer shell in this solution cooperate with the through holes on the base plate, which can improve the stability of the base plate. This can prevent the outer shell of the isolation cover from shaking during use, thereby ensuring the stability of the isolation cover installation.

[0015] Furthermore, both the positioning post and the through hole are provided in multiple ways, and the multiple through holes respectively cooperate with the multiple positioning posts.

[0016] Beneficial effects: The multiple positioning posts and through holes in this design can limit the position of the base plate, thereby further improving the stability of the isolation cover installation.

[0017] Furthermore, all four side panels are detachably connected to the top panel.

[0018] Beneficial effects: In this design, the top plate can be detachably connected to all four side plates. This allows the four side plates to be connected to the bottom plate first, and then the top plate to be connected to the top of the four side plates during assembly. This method makes the assembly process more convenient.

[0019] Furthermore, all four side plates are fixedly connected to the top plate.

[0020] Beneficial effects: This solution provides an alternative way to connect the side panels and the top panel. In this way, the side panels and the top panel are connected as a whole, and then connected to the bottom panel.

[0021] Furthermore, a mounting groove is provided at the top of the outer casing, and the panel is installed in the mounting groove.

[0022] Beneficial effects: The mounting slots in this design can help organize the installation of the panels and reduce the area occupied by the panels.

[0023] Furthermore, the mounting groove and the inner cavity of the housing form a stepped hole structure, and the top of the panel is located below the top of the mounting groove.

[0024] Beneficial effects: In this design, a certain space is left between the panel and the mounting slot, which makes it easier to fix the panel with fasteners and keep the fasteners inside the mounting slot, reducing or even eliminating the protrusion of the fasteners, thus making the assembly of the entire tester more reasonable and reducing space waste.

[0025] Furthermore, the top plate includes a first insert plate and a second insert plate, which are spliced ​​together to form the entire top plate. The first insert plate has a plurality of first notches, and the second insert plate has a plurality of second notches. After the first insert plate and the second insert plate are spliced ​​together, the plurality of first notches are spliced ​​together with the plurality of second notches to form cable holes.

[0026] Beneficial effects: The top plate in this solution includes a first insert plate and a second insert plate. When the first insert plate and the second insert plate are spliced ​​together, the first notch and the second notch are combined to form a cable hole corresponding to the interface on the panel. Since the plugs in the panel interface are connected to the electrical components via cables, the cables cannot pass through the cable holes on the top plate when the isolation cover is installed directly. However, in this design, it is convenient for users to purchase current transformer testers without isolation covers by disassembling the first insert plate and the second insert plate and connecting them together, so that the cables are located in the corresponding notches. After the first insert plate and the second insert plate are connected, the cables can be located in the cable holes formed by the splicing, thus achieving the purpose of installing the isolation cover smoothly and quickly. It also facilitates the disassembly of the isolation cover later, making it easier to maintain the electrical components inside the casing. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0028] Figure 1This is a longitudinal cross-sectional view of Embodiment 1 of the isolated current transformer tester of this utility model;

[0029] Figure 2 This is a top view of the panel in Embodiment 1 of the present invention, which is an isolated current transformer tester.

[0030] Figure 3 for Figure 1 A magnified view of a section at point A in the middle;

[0031] Figure 4 This is a longitudinal cross-sectional view of Embodiment 2 of the isolated current transformer tester of this utility model.

[0032] Figure 5 This is a top view of one of the disassembly methods of the top plate in Embodiment 3 of the present invention, which is an isolated current transformer tester.

[0033] Figure 6 for Figure 5 Top view of the first insert plate formed after the middle top plate is split;

[0034] Figure 7 for Figure 5 A top view of the second insert plate formed after the middle top plate is split;

[0035] Figure 8 This is a top view of another way of splitting the top plate in Embodiment 3 of the present invention, which is an isolated current transformer tester.

[0036] Figure 9 for Figure 8 Top view of the first insert plate formed after the middle top plate is split;

[0037] Figure 10 for Figure 8 A top view of the second insert plate formed after the middle top plate is split.

[0038] The attached diagram shows the markings and corresponding component names:

[0039] 1. Outer shell; 2. Panel; 21. Interface; 22. Display mounting hole; 3. Isolation cover; 31. Base plate; 310. Clip; 32. Side plate; 320. Slot; 321. Tapered flare; 330. Top plate; 331. Cable hole; 332. First insert plate; 333. Second insert plate; 334. First notch; 335. Second notch; 336. Display perforation; 337. Electrical components; 4. Positioning post; 5. Mounting slot; 6. Screw; 7. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0041] Example 1

[0042] like Figures 1-2 As shown, this embodiment 1 provides an isolated current transformer tester, including a housing 1, a panel 2, and electrical components 4. The electrical components 4 are installed inside the housing 1 and include components such as a PCB board and a battery for testing current transformers.

[0043] Panel 2 is located on the top of housing 1. In this embodiment, a mounting groove 6 is provided at the top of housing 1. Panel 2 is installed in the mounting groove 6. In this embodiment, the mounting groove 6 and the inner cavity of housing 1 form a stepped hole structure, that is, the inner diameter of the mounting groove 6 is larger than the inner diameter of the inner cavity of housing 1. The top of panel 2 is located below the top of mounting groove 6. The four right corners of panel 2 are fixed in the mounting groove 6 by screws 7. Since the top of panel 2 is located below the top of mounting groove 6, a certain space is left between panel 2 and the top of mounting groove 6. After the screws 7 are fixed to panel 2, the ends of the screws 7 can be located in this space, thus hiding the screws 7.

[0044] Combination Figure 2 As shown, panel 2 has multiple interfaces 21, each containing a plug. The plugs are connected to electrical components 4 via cables. Panel 2 also has display mounting holes 22 for mounting the display screen. Figure 1 As shown, an isolation cover 3 is also provided inside the outer casing 1. Electrical components 4 are located inside the isolation cover 3. The isolation cover 3 is a metal isolation cover. The isolation cover 3 can shield electromagnetic interference and improve the accuracy of the tester's detection data.

[0045] In this embodiment, the isolation cover 3 includes a base plate 31, side plates 32, and a top plate 33. The base plate 31 is located at the bottom of the outer shell 1. In this embodiment, the bottom wall of the outer shell 1 is connected to a positioning post 5. The positioning post 5 is integrally connected to the outer shell 1 or connected by screws or bolts 7. The base plate 31 has through holes, and the through holes on the base plate 31 are fitted onto the positioning posts 5. In this embodiment, there are multiple positioning posts 5 and through holes, and the multiple through holes cooperate with multiple positioning posts 5 respectively. In this embodiment, there are four positioning posts 5 and four through holes. The four positioning posts 5 are located at the four corners of the outer shell 1 respectively. The cooperation between the positioning posts 5 and the through holes can play a role in positioning and restricting the installation position of the base plate 31, ensuring the stability of the installation of the base plate 31, thereby ensuring the stability of the entire isolation cover 3.

[0046] In this embodiment, four side plates 32 are provided, which together form a rectangular frame structure. The bottom ends of the four side plates 32 are detachably connected to the bottom plate 31, and the top ends of the four side plates 32 are connected to the top plate 33. Specifically: combined with Figure 1 and Figure 3 As shown, the top of the base plate 31 is connected to multiple locking blocks 310, and the four side plates 32 are provided with locking slots 320 that engage with the multiple locking blocks 310 respectively. In this embodiment, each side plate 32 is provided with locking slots 320 on both sides. The number and position of the locking blocks 310 at the top of the base plate 31 correspond to the position of the locking slots 320 on the side plates 32. In this embodiment, a tapered flared opening 321 is provided at the bottom of the locking slot 320, which makes it easier for the locking slot 320 and the locking block 310 to engage quickly.

[0047] All four side panels 32 are fixedly connected to the top panel 33 (e.g., the four side panels 32 and the top panel 33 are integrally formed). In this embodiment, the top panel 33 is provided with cable holes 330 that correspond sequentially to the multiple interfaces 21 on the panel 2. The top panel 33 is also provided with a display screen through hole 335 through which the display screen passes. The cable holes 330 facilitate the passage of cables.

[0048] The specific implementation process is as follows:

[0049] In this embodiment, the base plate 31 is first fitted onto the positioning post 5 through the through hole. Then, the plug and display screen on the panel 2 are connected to the outside of the tester. The cable on the plug passes through the cable hole 330 on the top plate 33. Then, one end of the cable is connected to the corresponding part of the electrical component 4. The assembled whole is then placed into the inner cavity of the outer shell 1. The slot 320 on the side plate 32 is engaged with the locking block 310 on the base plate 31 to complete the installation. After the side plate 32 and the base plate 31 are connected and engaged, a relatively closed shielding and isolation structure is formed between the side plate 32 and the top plate 33, which can avoid magnetic field interference. Finally, the panel 2 is fixed with screws 7 to complete the installation.

[0050] Example 2

[0051] The difference between this embodiment and Embodiment 1 is that: Figure 4 As shown, in this embodiment, all four side plates 32 are detachably connected to the top plate 33. The four side plates 32 can be integrally connected or consist of four independent parts, and can be manufactured according to actual needs. In this embodiment, the detachable connection between the side plates 32 and the top plate 33 is the same as the detachable connection between the side plates 32 and the bottom plate 31 in Embodiment 1. That is, the top of the side plate 32 is provided with a slot 320, and the bottom of the top plate 33 is integrally connected with a locking block 310. The top plate 33 and the side plates 32 are also connected and fixed through the cooperation of the slot 320 and the locking block 310.

[0052] Example 3

[0053] The difference between this embodiment and Embodiment 1 is that: Figure 5 , Figure 6 and Figure 7 As shown, the top plate 33 includes a first insert plate 331 and a second insert plate 332, which are spliced ​​together to form the top plate 33 as a whole (e.g., Figure 5 The first insert plate 331 has multiple first notches 333, and the second insert plate 332 has multiple second notches 334. After the first insert plate 331 and the second insert plate 332 are spliced ​​together, the multiple first notches 333 and the multiple second notches 334 are spliced ​​together to form cable holes 330. At the same time, the first insert plate 331 has a first through hole 336, and the second insert plate 332 has a second through hole 337. The splicing structure of the first insert plate 331 and the second insert plate 332, the first through hole 336 and the second through hole 337 are spliced ​​together to form a display screen through hole 335.

[0054] In this embodiment, the top plate 33 is divided into two parts, a first insert plate 331 and a second insert plate 332, along multiple cable holes 330 and display screen through holes 335 on the top plate 33. The first insert plate 331 and the second insert plate 332 respectively have a first insertion hole and a second insertion hole, as well as a first through hole 336 and a second through hole 337. Figure 8 , Figure 9 and Figure 10 As shown, this embodiment also discloses another way in which the top plate 33 is split into a first insert plate 331 and a second insert plate 332.

[0055] The specific implementation process is as follows: When installing the top plate 33, first use the first insert plate 331 or the second insert plate 332. In this embodiment, the first insert plate 331 is used as an example. The multiple cables on the panel 2 are arranged and placed in the first notch 333 on the first insert plate 331. The first through hole 336 is located on one side of the display screen. Then, the second insert plate 332 is used to arrange the multiple cables and place them in the second notch 334. The second through hole 337 is located on the other side of the display panel. Then, the first insert plate 331 and the second insert plate 332 are connected and assembled with each other, so that the cables are located in the cable hole 330 formed by the first notch 333 and the second notch 334, and the display screen is located in the display screen through hole 335 formed by the first through hole 336 and the second through hole 337.

[0056] Then, following the method described in the above embodiment, the top plate 33, side plate 32 and bottom plate 31 are connected and fitted together.

[0057] In this embodiment, it is easier to disassemble the isolation cover 3 and to allow users to install the isolation cover 3 themselves in the purchased tester. Since the cables on the panel 2 of the purchased tester are already connected to the electrical components 4, the cables cannot pass smoothly through the cable hole 330 on the top plate 33 of the isolation cover 3. However, in this embodiment, the top plate 33 of the isolation cover 3 is a detachable structure. Therefore, even if the cables on the panel 2 are already connected to the electrical components 4, the first insert plate 331 and the second insert plate 332 of the top plate 33 can be spliced ​​together without adding any other steps. The cables are placed in the cable hole 330 formed after splicing, thus completing the installation of the isolation cover 3. This is convenient and easy to operate for users, and it also facilitates the later disassembly and repair of the electrical components 4 after removing the top plate 33 of the isolation cover 3.

[0058] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An isolated current transformer tester, comprising a housing, a panel, and electrical components, wherein the electrical components are installed inside the housing, the panel is located on top of the housing, the panel is provided with multiple interfaces, each interface containing a plug, the plug being connected to the electrical components via a cable, characterized in that, The housing is also equipped with an isolation cover, and the electrical components are located inside the isolation cover. The isolation cover includes a bottom plate, side plates and a top plate. The bottom plate is located at the bottom of the housing. Multiple side plates are provided, and the multiple side plates are arranged to form a frame structure. The bottom ends of the multiple side plates are detachably connected to the bottom plate, and the top ends of the multiple side plates are connected to the top plate. The top plate has cable holes that correspond sequentially to the multiple interfaces on the panel.

2. The isolated current transformer tester according to claim 1, characterized in that, The top of the base plate is connected to multiple locking blocks, and the multiple side plates are provided with locking slots that engage with the multiple locking blocks respectively.

3. The isolated current transformer tester according to claim 2, characterized in that, The bottom of the slot is provided with a tapered flare.

4. The isolated current transformer tester according to claim 1, characterized in that, The bottom wall of the outer casing is connected to a positioning post, and a through hole is provided on the bottom plate, with the through hole on the bottom plate fitting onto the positioning post.

5. The isolated current transformer tester according to claim 4, characterized in that, The positioning post and the through hole are provided in multiple ways, and the multiple through holes are respectively engaged with the multiple positioning posts.

6. The isolated current transformer tester according to claim 1, characterized in that, All four side panels are detachably connected to the top panel.

7. The isolated current transformer tester according to claim 1, characterized in that, All four side plates are fixedly connected to the top plate.

8. The isolated current transformer tester according to claim 1, characterized in that, The top of the outer casing has a mounting groove, and the panel is installed in the mounting groove.

9. The isolated current transformer tester according to claim 8, characterized in that, The mounting groove forms a stepped hole structure with the inner cavity of the housing, and the top of the panel is located below the top of the mounting groove.

10. An isolated current transformer tester according to any one of claims 1-9, characterized in that, The top plate includes a first insert plate and a second insert plate. The first insert plate and the second insert plate are spliced ​​together to form the whole top plate. The first insert plate has a plurality of first notches, and the second insert plate has a plurality of second notches. After the first insert plate and the second insert plate are spliced ​​together, the plurality of first notches and the plurality of second notches are respectively spliced ​​together to form cable holes.

Images