Overload protection integrated module and multi-ratio current transformer

Abstract

The utility model provides an overload protection integrated module and multiple variable ratio current transformers belong to transformer technical field, and the overload protection integrated module is arranged on the shell of multiple variable ratio current transformers, the overload protection integrated module includes adapter and multiple overload protection elements, the bottom surface of adapter has multiple respectively with each electric connection tap of secondary side coil connection conduction's plug, the top surface has multiple groups of jacks, and each group of jacks includes two respectively with two plugs one to one corresponding single hole, each overload protection element is inserted in one group of jacks respectively and is conducted with corresponding plug, wherein, each overload protection element has different overload trigger threshold, and the turns number between overload trigger threshold and secondary side coil between two corresponding electric connection taps corresponds, the overload protection integrated module provided by the utility model can improve the compactness and wiring convenience of multiple variable ratio current transformer overload protection structure.

Description

Technical Field

[0001] This utility model belongs to the field of current transformer technology, specifically relating to an overload protection integrated module and a current transformer. Background Technology

[0002] Current transformers are key devices used for measurement and protection in power systems. They convert large currents into smaller currents proportionally through the principle of electromagnetic induction, achieving electrical isolation and signal transmission. Current transformers themselves do not directly disconnect the circuit; instead, overload protection is achieved through external overload protection devices such as relays or circuit breakers.

[0003] In existing technology, the current transformer and the overload protection device are two independent modules. The overload protection module needs to be connected to the secondary side of the current transformer via wires. When the current exceeds a preset threshold, the secondary side outputs a signal to drive the overload protection device to cut off the circuit, thereby achieving overload protection. The drawback of this approach is that after the current transformer's ratio is adjusted, the corresponding overload protection device needs to be replaced and rewired. The wiring process is time-consuming and labor-intensive, thus affecting work efficiency. Moreover, the independent installation and wiring of the current transformer and the overload protection device result in a large installation space requirement. Utility Model Content

[0004] This utility model provides an overload protection integrated module and a multi-ratio current transformer, aiming to improve the structural compactness and installation and wiring convenience of the overload protection scheme based on the adjustable ratio current transformer.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, an overload protection integrated module is provided, which is installed on the housing of a multi-ratio current transformer. The housing has multiple contact taps drawn from the secondary coil of the multi-ratio current transformer. The overload protection integrated module includes an adapter and multiple overload protection elements. The bottom surface of the adapter has multiple plugs that are connected and conductive to each contact tap, and the top surface has multiple sets of sockets, each set of sockets including two single holes corresponding to two of the plugs. Each overload protection element is respectively plugged into one set of sockets and conductive to the corresponding plug. Each overload protection element has a different overload trigger threshold, and the overload trigger threshold corresponds to the number of turns of the secondary coil between its two corresponding contact taps.

[0006] In conjunction with the first aspect, in one possible implementation, the adapter includes: The casing is sealed and fixed to the outer shell; Multiple adapters are spaced apart inside the housing. Each adapter has a plug that inserts into the housing and connects to one of the power taps. Each adapter also has multiple single holes. The casing is filled with insulating adhesive to secure each adapter.

[0007] In some embodiments, the top surface of the adapter is embedded with multiple conductive sleeves that abut downward against the conductive plug and extend upward through insulating adhesive, with the inner hole of each conductive sleeve forming a single hole.

[0008] For example, the overload protection element has two electrodes that are respectively connected to conductive sleeves on two of the adapters.

[0009] For example, the adapter includes a conductive post, which is horizontally embedded in the insulating adhesive and extends perpendicular to the spacing of each power tap. The conductive post has multiple recessed holes spaced along its extension direction, and a conductive sleeve is fixedly embedded in each recessed hole. The plug is integrally formed on the bottom surface of the conductive post.

[0010] In one possible implementation, the adapter also includes multiple grounding posts, one end of each grounding post extending into the insulating adhesive and connected to one of the conductive posts for conduction, and the other end extending out of the casing.

[0011] In some embodiments, the peripheral wall of the conductive post is provided with ribs and / or annular grooves.

[0012] For example, the cover and the outer shell are injection molded as a single unit.

[0013] For example, overload protection components include thermal relays or circuit breakers.

[0014] The advantages of the overload protection integrated module provided by this utility model are as follows: Compared with the prior art, the overload protection integrated module of this utility model is integrated and installed on the housing of a multi-ratio current transformer through an adapter. The various plugs of the adapter are connected to the respective energizing taps on the secondary coil of the multi-ratio current transformer. At the same time, the overload protection elements matched with the various ratios of the multi-ratio current transformer are correspondingly plugged into the respective sets of sockets on the top surface of the adapter. When the multi-ratio current transformer is energized on the secondary side with any two energizing taps, the overload protection element with an overload trigger threshold corresponding to the number of coil turns between the two energizing taps will work accordingly. Thus, overload protection under different ratios can be achieved without rewiring, thereby improving the overall structural compactness and installation and wiring convenience of the overload protection scheme.

[0015] Secondly, this utility model embodiment also provides a multi-ratio current transformer, including the above-mentioned overload protection integrated module.

[0016] The advantages of the multi-ratio current transformer provided by this utility model are as follows: Compared with the prior art, the current transformer of this utility model adopts the above-mentioned overload protection integrated module, which is integrated and installed on the housing of the multi-ratio current transformer through an adapter. The various plugs of the adapter are connected to the respective energizing taps on the secondary side coil of the multi-ratio current transformer. At the same time, the overload protection elements matching the various ratios of the multi-ratio current transformer are correspondingly plugged into the respective sets of sockets on the top surface of the adapter. When the multi-ratio current transformer is energized on the secondary side with any two energizing taps, the overload protection element with an overload trigger threshold corresponding to the number of coil turns between the two energizing taps will work accordingly. Overload protection under different ratios can be achieved without rewiring, thereby improving the overall structural compactness and installation and wiring convenience of the overload protection scheme. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of the overload protection integrated module provided in this embodiment of the utility model; Figure 2 This is a three-dimensional structural diagram of the adapter used in the embodiments of this utility model; Figure 3 An exploded view of the overload protection integrated module provided in this embodiment of the utility model; Figure 4 This is a three-dimensional structural diagram of the adapter used in the embodiment of this utility model; Figure 5 A circuit connection diagram of the overload protection integrated module provided in this embodiment of the utility model.

[0018] In the diagram: 10, outer casing; 100, power tap; 20, adapter; 201, plug; 202, socket; 2021, single hole; 21, cover; 22, adapter body; 221, conductive sleeve; 222, conductive post; 2221, raised rib; 2222, annular groove; 23, insulating glue; 24, grounding post; 30, overload protection element; 31, power electrode. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0021] In the prior art, the transformation ratio of a current transformer refers to the ratio of the primary and secondary currents, which is inversely proportional to the number of turns in the primary and secondary coils. The transformation ratio of the current transformer needs to be adjusted according to the load current. The most common way to adjust the transformation ratio is by setting taps on the secondary coil. By connecting different taps, the effective number of turns in the secondary coil can be adjusted. The number and position of the taps can be determined based on the actual transformation ratio adjustment requirements. In the embodiments of this application, three connection taps are used for the secondary coil for illustration, but this does not mean that this application limits the number of connection taps to three; there can also be more than three.

[0022] Please refer to the following: Figures 1 to 5 The overload protection integrated module provided by this utility model will now be described. The overload protection integrated module is installed on the housing 10 of a multi-ratio current transformer. The housing 10 has multiple contact taps 100 extending from the secondary coil of the multi-ratio current transformer. The overload protection integrated module includes an adapter 20 and multiple overload protection elements 30. The bottom surface of the adapter 20 has multiple plugs 201 that are respectively connected to and conductively communicate with each contact tap 100, and the top surface has multiple sets of sockets 202. Each set of sockets 202 includes two single holes 2021 that correspond one-to-one with two of the plugs 201. Each overload protection element 30 is respectively plugged into one set of sockets 202 and is conductively communicated with the corresponding plug 201. Each overload protection element 30 has a different overload trigger threshold, and the overload trigger threshold corresponds to the number of turns of the secondary coil between its two corresponding contact taps 100.

[0023] It should be noted that in this embodiment, the adapter 20 can be detachably connected by plugging the plug 201 into the housing 10, or the adapter 20 can be directly fixed to the housing 10, with each plug 201 inserted into the housing 10 corresponding to each tap 100 for electrical connection. Each plug 201 is equivalent to a terminal connected in parallel to each tap 100. Based on this, the input and output terminals of the overload protection element 30 are respectively inserted into the two single holes 2021 of each set of sockets 202, thereby achieving electrical connection with the two taps 100.

[0024] Taking three power taps 100 as an example, the adapter 20 is provided with three sets of sockets 202. The two single holes 2021 of the first set are connected to the plugs 201 corresponding to the first and second power taps 100, respectively. The two single holes 2021 of the second set are connected to the plugs 201 corresponding to the first and third power taps 100, respectively. The two single holes 2021 of the third set are connected to the plugs 201 corresponding to the second and third power taps 100, respectively. This forms three combinations corresponding to different numbers of turns of the secondary coil. The three overload protection elements 30 are connected to the three sets of sockets 202 one by one, so that when any two power taps 100 are used as secondary input and output connections, there is a corresponding overload protection element 30 working.

[0025] Compared with the prior art, the overload protection integrated module provided in this embodiment is integrated and installed on the housing 10 of the multi-ratio current transformer through an adapter 20. Each plug 201 of the adapter 20 is connected to each energizing tap 100 on the secondary coil of the multi-ratio current transformer. At the same time, the overload protection element 30, which matches each ratio of the multi-ratio current transformer, is correspondingly plugged into each set of sockets 202 on the top surface of the adapter 20. When the multi-ratio current transformer is energized on the secondary side by any two energizing taps 100, the overload protection element 30 with an overload trigger threshold corresponding to the number of coil turns between the two energizing taps 100 will work accordingly. Thus, overload protection under different ratios can be achieved without rewiring, thereby improving the overall structural compactness and installation and wiring convenience of the overload protection scheme.

[0026] In some embodiments, see Figures 2 to 4 The adapter 20 includes a housing 21 and multiple adapter bodies 22; the housing 21 is fixed to the outer shell 10; the multiple adapter bodies 22 are spaced apart inside the housing 21, each adapter body 22 has a plug 201 that is inserted into the outer shell 10 and connected to one of the power taps 100, and each adapter body 22 has multiple single holes 2021; wherein, the housing 21 is filled with insulating adhesive 23 for fixing each adapter body 22.

[0027] The adapter 22 can be made of conductive metal material, and its position is fixed by the insulating glue 23 injected into the casing 21. This not only improves the compactness of the structure, but also ensures the insulation reliability between adjacent adapters 22 and the overall airtight and waterproof performance of the adapter 20.

[0028] As one specific structural form of the aforementioned adapter 22, please refer to Figure 3 and Figure 4 The top surface of the adapter 22 is embedded with multiple conductive sleeves 221 that abut downward against the conductive plug 201 and extend upward through the insulating adhesive 23. The inner hole of each conductive sleeve 221 forms a single hole 2021. By setting the conductive sleeves 221, the depth of the single hole 2021 can be increased, thereby improving the reliability of the connection between the overload protection element 30 and the single hole 2021. On the other hand, it can prevent the sealant from seeping into the single hole 2021 during potting and affecting the permeability and conductivity of the conductive sleeve 221.

[0029] It should be noted that you should refer to [link / reference]. Figure 3 In this embodiment, the overload protection element 30 has two electrodes 31, which are respectively connected to the conductive sleeves 221 on two of the adapters 22. Specifically, the electrodes 31 can be cylindrical structures, with the two electrodes 31 serving as the input and output ends respectively, and are connected to the conductive sleeves 221. The structure is simple, compact, and easy to disassemble and replace.

[0030] Specifically, such as Figure 4 As shown, in this embodiment, the adapter 22 includes a conductive post 222, which is horizontally embedded in the insulating adhesive 23 and extends perpendicularly to the interval direction of each power tap 100. The conductive post 222 has multiple embedded holes distributed at intervals along its extension direction, and a conductive sleeve 221 is fixedly embedded in each embedded hole. The plug 201 is integrally formed on the bottom surface of the conductive post 222.

[0031] The conductive post 222 provides the setting position for each single hole 2021. At the same time, the conductive post 222 and the plug 201 can be integrated into a single structure to ensure the conductivity reliability between each conductive sleeve 221 and the plug 201. The conductive post 222 is provided with recessed holes for the conductive sleeve 221 to be inserted to ensure the connection reliability of the conductive sleeve 221. On this basis, conductive adhesive can be applied to the part of the conductive sleeve 221 that is inserted into the recessed hole for bonding, thereby improving conductivity and connection strength.

[0032] For some possible implementations, please refer to [link / reference]. Figure 2 and Figure 4 The adapter 20 also includes multiple grounding posts 24, one end of each grounding post 24 extending into the insulating adhesive 23 and connected to one of the conductive posts 222 for conduction, and the other end extending out of the casing 21.

[0033] By setting the grounding post 24, the secondary side can be protected against grounding, thereby improving the operational safety of the multi-ratio current transformer. Since the current transformer has mandatory requirements for the current direction, with three grounding taps 100, the first tap 100 can only be used as an input terminal, the third tap 100 as an output terminal, and the second tap 100 in the middle can be used as both an input and an output terminal. Since the grounding protection scheme grounds the secondary side output terminal, in this embodiment, only the two conductive posts 222 corresponding to the conducting points of the second and third taps 100 need to be set with grounding posts 24.

[0034] To improve the connection reliability of the adapter 22 within the housing 21, please refer to... Figure 4 In this embodiment, the peripheral wall of the conductive post 222 is provided with a raised rib 2221 and / or annular groove 2222. As the main structure of the adapter 22, the conductive post 222, by providing the raised rib 2221 or annular groove 2222, can not only increase the contact area between the conductive post 222 and the insulating adhesive 23, but also form a snap-fit ​​structure with concave and convex fittings, thereby improving the reliability of the adapter 22 being fixed in the casing 21 based on the insulating adhesive 23.

[0035] For example, please refer to Figure 1 In this embodiment, the cover 21 and the outer shell 10 are integrally injection molded. Both the cover 21 and the outer shell 10 are injection molded parts, and the two can be integrally injection molded, which not only improves the structural compactness, but also improves the connection reliability between the cover 21 and the outer shell 10.

[0036] For example, the overload protection element 30 mentioned above is a thermal relay or circuit breaker. After the current transformer converts the large primary current into a small secondary current according to the transformation ratio, the thermal relay or circuit breaker detects and responds to the abnormal current, thereby realizing overload or short circuit protection.

[0037] Based on the same inventive concept, combined with Figures 1 to 5 It is understood that this application embodiment also provides a multi-ratio current transformer, including the above-mentioned overload protection integrated module.

[0038] Compared with the prior art, the multi-ratio current transformer provided in this embodiment adopts the above-mentioned overload protection integrated module, which is integrated and installed on the housing 10 of the multi-ratio current transformer through an adapter 20. Each plug 201 of the adapter 20 is connected to each energizing tap 100 on the secondary side coil of the multi-ratio current transformer. At the same time, the overload protection element 30 matching each ratio of the multi-ratio current transformer is correspondingly plugged into each set of sockets 202 on the top surface of the adapter 20. When the multi-ratio current transformer is energized on the secondary side by any two energizing taps 100, the overload protection element 30 with an overload trigger threshold corresponding to the number of coil turns between the two energizing taps 100 will work accordingly. Thus, overload protection under different ratios can be achieved without rewiring, thereby improving the overall structural compactness and installation and wiring convenience of the overload protection scheme.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An overload protection integrated module, characterized in that, For mounting on the housing of a multi-ratio current transformer, the housing having multiple energizing taps drawn from the secondary coil of the multi-ratio current transformer; the overload protection integrated module includes an adapter and multiple overload protection elements; The bottom surface of the adapter has multiple plugs that are connected to each of the power taps, and the top surface has multiple sets of sockets. Each set of sockets includes two single holes that correspond one-to-one with two of the plugs. Each of the overload protection elements is plugged into one of the sets of sockets and connected to the corresponding plug. Each of the overload protection elements has a different overload trigger threshold, which corresponds to the number of turns of the secondary coil between its two corresponding energizing taps.

2. The overload protection integrated module as described in claim 1, characterized in that, The adapter includes: The casing is attached and fixed to the outer shell; Multiple adapters are spaced apart inside the housing. Each adapter has a plug that is inserted into the housing and connects to one of the power taps. Each adapter also has multiple single holes. The casing is filled with insulating adhesive to fix each of the adapters.

3. The overload protection integrated module as described in claim 2, characterized in that, The top surface of the adapter is embedded with multiple conductive sleeves that abut downwards against the plug and extend upwards through the insulating adhesive, and the inner hole of each conductive sleeve forms a single hole.

4. The overload protection integrated module as described in claim 3, characterized in that, The overload protection element has two electrical electrodes, which are respectively connected to the conductive sleeves on two of the adapters.

5. The overload protection integrated module as described in claim 3, characterized in that, The adapter includes a conductive post, which is horizontally embedded inside the insulating adhesive and extends perpendicularly to the spacing direction of each of the power taps. The conductive post has multiple recessed holes spaced apart along its extension direction, and a conductive sleeve is fixedly embedded in each recessed hole. The plug is integrally formed on the bottom surface of the conductive post.

6. The overload protection integrated module as described in claim 5, characterized in that, The adapter also includes multiple grounding posts, one end of each grounding post extending into the insulating adhesive and connected to one of the conductive posts for conduction, and the other end extending out of the casing.

7. The overload protection integrated module as described in claim 5, characterized in that, The conductive post has raised ribs and / or annular grooves on its peripheral wall.

8. The overload protection integrated module as described in claim 2, characterized in that, The sealing shell and the outer shell are integrally injection molded.

9. The overload protection integrated module as described in any one of claims 1-8, characterized in that, The overload protection element is a thermal relay or a circuit breaker.

10. A multi-ratio current transformer, characterized in that, Includes the overload protection integrated module as described in any one of claims 1-9.

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