Voltage transformer

Abstract

The utility model discloses a voltage transformer, which relates to the technical field of voltage transformers and comprises a shell and a transformer body, the transformer body comprises an iron core, a secondary coil and a primary coil, an insulating framework is fixedly arranged outside the iron core, the secondary coil is wound outside the insulating framework, an insulating layer is wound outside the secondary coil, and the primary coil is wound outside the insulating layer. An insulating layer is arranged outside the transformer body, the primary coil is wound outside the insulating layer, the primary coil and the secondary coil are both used for being connected with an external circuit, the shell is formed by pouring an insulating material outside the transformer body, and the transformer body is wrapped by the shell and sealed in the shell. The voltage transformer is convenient to maintain, the secondary load capacity is higher, two secondary coils can be arranged, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage transformers, in particular to a voltage transformer. Background Art

[0002] At present, when a voltage transformer is in use, it is necessary to transmit signals to a remote control station, which puts higher requirements on the voltage transformer. The old-fashioned low-voltage transformers have the following problems: most of the shells of the old-fashioned low-voltage transformers adopt a semi-closed structure, and the iron core and coil are in contact with the external environment, which is easily affected by external environmental factors, the iron core is contaminated, and maintenance is inconvenient; the reliability of the connection between the iron core and the shell is not strong, and during transportation, the iron core is prone to looseness. Whether the iron core is contaminated by external environmental pollution or the iron core is loose, it is easy to cause the error of the transformer to be unqualified and the secondary load-carrying capacity to become low, which is not suitable for long-distance power transmission. Therefore, there is an urgent need for a voltage transformer that is easy to maintain and has a stronger secondary load-carrying capacity. Content of the Utility Model

[0003] The purpose of the utility model is to provide a voltage transformer to solve the problems existing in the above-mentioned prior art, which is easy to maintain and has a stronger secondary load-carrying capacity.

[0004] To achieve the above purpose, the utility model provides the following scheme:

[0005] The utility model provides a voltage transformer, including: a shell and a transformer body. The transformer body includes an iron core, a secondary coil and a primary coil. An insulating skeleton is fixedly arranged outside the iron core, the secondary coil is wound outside the insulating skeleton, an insulating layer is wound outside the secondary coil, the primary coil is wound outside the insulating layer, and both the primary coil and the secondary coil are used for connecting external circuits. The shell is formed by pouring insulating materials outside the transformer body, and the transformer body is wrapped by the shell and sealed in the shell.

[0006] Preferably, it further includes a primary connector and a secondary connector. The primary connector and the secondary connector are both fixedly installed on the shell and extend into the shell. The primary connector is connected to the primary coil through a primary lead, the secondary connector is connected to the secondary coil through a secondary lead, and both the primary connector and the secondary connector are used for connecting to an external circuit.

[0007] Preferably, it further includes a primary insert and a secondary insert. Both the primary insert and the secondary insert are embedded in the housing and extend into the housing. Threaded holes are provided on both the primary insert and the secondary insert. Both the primary connecting member and the secondary connecting member are screws. The primary connecting member is threadedly connected to the threaded hole on the primary insert, and the secondary connecting member is threadedly connected to the threaded hole on the secondary insert. One end of the primary lead wire away from the primary coil is connected to the insert, and one end of the secondary lead wire away from the secondary coil is connected to the secondary insert.

[0008] Preferably, the secondary coil includes an inner secondary coil and an outer secondary coil. The insulating layer includes a first insulating layer and a second insulating layer. The inner secondary coil is wound around the insulating skeleton. The first insulating layer is wound around the inner secondary coil. The outer secondary coil is wound around the first insulating layer. The second insulating layer is wound around the outer secondary coil. The primary coil is wound around the second insulating layer. Both the inner secondary coil and the outer secondary coil are used to connect to an external circuit.

[0009] Preferably, there are two primary connecting members and two primary lead wires respectively. The secondary connecting member includes two inner secondary connecting members and two outer secondary connecting members. The secondary lead wire includes two inner secondary lead wires and two outer secondary lead wires. The two primary connecting members are respectively connected to the primary coil through the two primary lead wires. The two inner secondary connecting members are respectively connected to the inner secondary coil through the two inner secondary lead wires. The two outer secondary connecting members are respectively connected to the outer secondary coil through the two outer secondary lead wires. Each of the primary connecting members, each of the inner secondary connecting members, and each of the outer secondary connecting members is used to connect to an external circuit.

[0010] Preferably, there are two primary inserts. The secondary insert includes two inner secondary inserts and two outer secondary inserts. The inner secondary connecting member is threadedly connected to the threaded hole on the inner secondary insert. The outer secondary connecting member is threadedly connected to the threaded hole on the outer secondary insert. One end of the primary lead wire away from the primary coil is connected to the insert. One end of the inner secondary lead wire away from the inner secondary coil is connected to the inner secondary insert. One end of the outer secondary lead wire away from the outer secondary coil is connected to the outer secondary insert.

[0011] Preferably, the housing is made of epoxy resin casting.

[0012] Preferably, it further includes a bottom plate and a plurality of bottom foot inserts. The bottom foot inserts are embedded in the bottom of the housing. One of the bottom foot inserts extends into the interior of the housing. The bottom foot inserts are connected to the bottom plate by countersunk head screws. The bottom plate can conduct electricity.

[0013] Preferably, it further includes a shield wire and a grounding bolt. One end of the shield wire is connected to the iron core, and the other end is connected to the foot insert extending into the interior of the housing. The grounding bolt is fixedly connected to the bottom plate and is used to be directly or indirectly connected to the ground.

[0014] Preferably, the iron core is a high-permeability iron core.

[0015] The utility model has achieved the following technical effects compared with the prior art:

[0016] For the voltage transformer provided by the utility model, the housing is made of insulating material and cast outside the iron core. The casting molding method of the housing enhances the reliability of the connection between the iron core and the housing, and the iron core is not easy to loosen during transportation; the iron core, the primary coil and the secondary coil are all wrapped and sealed by the housing, avoiding the contact between the iron core and the coil and the outside world, reducing the influence of external environmental factors and facilitating maintenance. Therefore, for the voltage transformer provided by the utility model, the iron core is not easy to loosen and is not easily affected by external environmental factors, facilitating maintenance, and the secondary load-carrying capacity is stronger.

[0017] Furthermore, two secondary coils can be provided in the voltage transformer of the utility model. The two secondary coils can be respectively connected to measuring equipment and relay protection equipment, so as to simultaneously meet the needs of measurement and relay protection, and the application range is wider.

[0018] Furthermore, the iron core made of high-permeability material can reduce the exciting current of the product, making the product more secure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a cross-sectional view of the voltage transformer provided by the present utility model;

[0021] Figure 2 It is a side view of the voltage transformer provided by the present utility model;

[0022] Figure 3 It is a top view of the voltage transformer provided by the present utility model;

[0023] In the figure: 1. Outer shell; 2. Iron core; 3. Insulating skeleton; 4. Inner secondary coil; 5. First insulating layer; 6. Primary coil; 7. Primary connector; 8. Inner secondary connector; 9. Outer secondary connector; 10. Primary insert; 11. Inner secondary insert; 12. Primary lead wire; 13. Inner secondary lead wire; 15. Bottom plate; 16. Foot insert; 17. Grounding bolt; 18. Shielding wire. Detailed implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] The purpose of the present invention is to provide a voltage transformer to solve the problems existing in the above-mentioned prior art, which is convenient for maintenance, has a stronger secondary load-carrying capacity and a larger capacity.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0027] Embodiment 1

[0028] This embodiment provides a voltage transformer, as Figures 1-3 shown, including: an outer shell 1 and a transformer body. The transformer body includes an iron core 2, an inner secondary coil 4 and a primary coil 6. An insulating skeleton 3 is fixedly arranged outside the iron core 2. The inner secondary coil 4 is wound outside the insulating skeleton 3. The first insulating layer 5 is wound outside the inner secondary coil 4. The primary coil 6 is wound outside the first insulating layer 5. Both the primary coil 6 and the inner secondary coil 4 are used to connect external circuits. The outer shell 1 is formed by pouring an insulating material outside the transformer body. The transformer body is wrapped by the outer shell 1 and sealed inside the outer shell 1.

[0029] The potential transformer provided in this embodiment is suitable for use under low voltage conditions of 1 kV and below. The housing 1 is cast with insulating material outside the iron core 2. Compared with the original assembly method, the casting method of the housing 1 makes the connection between the housing 1 and the iron core 2 more firm, enhancing the reliability of the connection between the iron core 2 and the housing 1, and the iron core 2 is not easily loosened during transportation; the iron core 2, the primary coil 6 and the inner secondary coil 4 are all arranged to be wrapped and sealed by the housing 1, avoiding the contact between the iron core 2 and the coils and the outside of the housing 1, reducing the influence of external environmental factors and facilitating maintenance. Therefore, for the potential transformer provided in this embodiment, the iron core 2 is not easily loosened and is not easily affected by external environmental factors, facilitating maintenance, and has a stronger secondary load-carrying capacity. Among them, the first insulating layer 5 can be insulating paper.

[0030] In order to facilitate the connection between the primary coil 6 and the inner secondary coil 4 and other electrical equipment, in a preferred embodiment of this embodiment, it further includes two primary connectors 7 and two inner secondary connectors 8. Each primary connector 7 and each inner secondary connector 8 are fixedly installed on the housing 1 and extend into the housing 1. The two primary connectors 7 are respectively connected to the primary coil 6 through two primary leads 12, and the two inner secondary connectors 8 are respectively connected to the inner secondary coil 4 through two inner secondary leads 13. Each primary connector 7 and each inner secondary connector 8 are used for connecting to an external circuit.

[0031] In a preferred embodiment of this embodiment, it further includes two primary inserts 10 and two inner secondary inserts 11. The two primary inserts 10 and the two inner secondary inserts 11 are both embedded in the housing 1 and extend into the housing. Threaded holes are provided on both the primary insert 10 and the inner secondary insert 11. The primary connector 7 is threadedly connected to the threaded hole on the primary insert 10, and the inner secondary connector 8 is threadedly connected to the threaded hole on the inner secondary insert 11. One end of the primary lead 12 away from the primary coil 6 is connected to the primary insert 10, and one end of the inner secondary lead 13 away from the inner secondary coil 4 is connected to the inner secondary insert 11. The primary connector 7 can be screwed into the threaded hole on the primary insert 10, and the inner secondary connector 8 can be screwed into the threaded hole on the inner secondary insert 11. The convenience of installing screws is improved through threaded connection.

[0032] In a preferred embodiment of this embodiment, the housing 1 is made of epoxy resin casting. Epoxy resin has good insulation performance and can prevent the iron core 2 from being interfered by external charges; epoxy resin has good fluidity after heating and is suitable for casting.

[0033] In a preferred embodiment of this embodiment, it further includes a bottom plate 15 and a plurality of bottom foot inserts 16. The bottom foot inserts 16 are embedded in the bottom of the housing 1, and one of the bottom foot inserts 16 extends into the interior of the housing 1. The bottom foot inserts 16 are connected to the bottom plate 15 through countersunk head screws. The formation of a threaded connection through the countersunk head screws and the bottom foot inserts 16 can facilitate the fixed installation of the bottom plate 15.

[0034] In a preferred embodiment of the first embodiment, it further includes a shield wire 18 and a grounding bolt 17. One end of the shield wire 18 is connected to the iron core 2, and the other end is connected to one of the foot inserts 16 extending into the housing 1. The grounding bolt 17 is fixedly connected to the bottom plate 15 and is used for grounding, and the bottom plate 15 can conduct electricity. By connecting the iron core 2 and the foot insert 16 through the shield wire 18 and then grounding the grounding bolt 17 through a wire, the iron core 2 is grounded, and there is no floating potential in the housing 1. Among them, the bottom plate 15 is preferably an iron plate.

[0035] In a preferred embodiment of the first embodiment, the iron core 2 is made of a high-permeability material. The high-permeability material can reduce the exciting current of the product and make the product more secure.

[0036] Embodiment 2

[0037] A voltage transformer, as Figures 1-3 shown, includes: a housing 1 and a transformer body. The transformer body includes an iron core 2, an inner secondary coil 4, an outer secondary coil (not shown in the figure), and a primary coil 6. An insulating skeleton 3 is arranged outside the iron core 2, the inner secondary coil 4 is wound outside the insulating skeleton 3, a first insulating layer 5 is wound outside the inner secondary coil 4, the outer secondary coil is wound outside the first insulating layer 5, a second insulating layer is wound outside the outer secondary coil, and the primary coil 6 is wound outside the second insulating layer. The primary coil 6, the inner secondary coil 4, and the outer secondary coil are all used to connect to an external circuit. The housing 1 is formed by pouring an insulating material outside the transformer body, and the transformer body is wrapped by the housing 1 and sealed inside the housing 1.

[0038] The voltage transformer provided by the present utility model is suitable for use under low voltage conditions of 1 kV and below. The housing 1 is formed by pouring an insulating material outside the iron core 2. The pouring molding method of the housing 1 enhances the reliability of the connection between the iron core 2 and the housing 1, and the iron core 2 is not easily loosened during transportation; the iron core 2, the inner secondary coil 4, the outer secondary coil, and the primary coil 6 are all wrapped and sealed by the housing 1, avoiding the contact between the iron core 2 and the outside of the housing 1, reducing the influence of external environmental factors on the iron core 2, facilitating maintenance, and having a strong secondary load-carrying capacity. Moreover, most of the old-fashioned low-voltage transformers are only provided with one secondary coil and cannot meet the usage requirements of measurement and relay protection at the same time. The voltage transformer in this embodiment has two secondary coils, and the two secondary coils can be respectively connected to a measurement device and a relay protection device, so as to meet the needs of measurement and relay protection at the same time. In addition, the voltage transformer in this embodiment can also be used in combination with the voltage transformer in the first embodiment. For example, one voltage transformer in the second embodiment and two voltage transformers in the first embodiment can be used to form a Y-shaped combination in a group of three, or two voltage transformers in the first embodiment can be used to form a V-shaped combination.

[0039] In order to facilitate the connection of the primary coil 6, the inner secondary coil 4, and the outer secondary coil to other electrical equipment, in a preferred embodiment of the first embodiment, it further includes a primary connector 7, two inner secondary connectors 8, and two outer secondary connectors 9. Each primary connector 7, each inner secondary connector 8, and each outer secondary connector 9 are fixedly installed on the housing 1 and extend into the housing 1. The two primary connectors 7 are respectively connected to the primary coil 6 through two primary leads 12. The two inner secondary connectors 8 are respectively connected to the inner secondary coil 4 through two inner secondary leads 13. The two outer secondary connectors 9 are respectively connected to the outer secondary coil through two outer secondary leads. Each primary connector 7, each inner secondary connector 8, and each outer secondary connector 9 are used to connect to an external circuit.

[0040] In a preferred embodiment of the first embodiment, it further includes two primary inserts 10, two inner secondary inserts 11, and two outer secondary inserts. The two primary inserts 10, the two inner secondary inserts 11, and the two outer secondary inserts are all embedded in the housing 1 and extend into the housing 1. Threaded holes are provided on the primary inserts 10, the inner secondary inserts 11, and the outer secondary inserts. The primary connector 7 is threadedly connected to the threaded hole on the primary insert 10. The inner secondary connector 8 is threadedly connected to the threaded hole on the inner secondary insert 11. The outer secondary connector 9 is threadedly connected to the threaded hole on the outer secondary insert. One end of the primary lead 12 away from the primary coil 6 is connected to the insert. One end of the inner secondary lead 13 away from the inner secondary coil 4 is connected to the inner secondary insert 11. One end of the outer secondary lead away from the outer secondary coil is connected to the outer secondary insert. The primary connector 7 can be screwed into the threaded hole on the primary insert 10. The inner secondary connector 8 can be screwed into the threaded hole on the inner secondary insert 11. The outer secondary connector 9 can be screwed into the threaded hole on the outer secondary insert. The convenience of installing screws is improved through threaded connection.

[0041] In a preferred embodiment of the first embodiment, the housing 1 is made of epoxy resin casting. Epoxy resin has good insulation performance and can prevent the iron core 2 from being interfered by external charges; it has good fluidity after heating and is suitable for casting and molding.

[0042] In a preferred embodiment of the first embodiment, it further includes a bottom plate 15 and four bottom foot inserts 16. The bottom foot inserts 16 are embedded in the bottom of the housing 1. One of the bottom foot inserts 16 extends into the interior of the housing 1. The bottom foot inserts 16 are connected to the bottom plate 15 through countersunk head screws. The threaded connection formed by the countersunk head screws and the bottom foot inserts 16 can facilitate the fixed installation of the bottom plate 15.

[0043] In a preferred embodiment of the first embodiment, it further includes a shield wire 18 and a grounding bolt 17. One end of the shield wire 18 is connected to the iron core 2, and the other end is connected to one of the foot inserts 16 extending into the housing 1. The grounding bolt 17 is fixedly connected to the bottom plate 15 and is used for grounding. The bottom plate 15 can conduct electricity. By connecting the iron core 2 and the foot insert 16 through the shield wire 18 and then grounding the grounding bolt 17 through a wire, the iron core 2 is grounded, and there is no floating potential in the housing 1. Among them, the bottom plate 15 is preferably an iron plate.

[0044] In a preferred embodiment of the first embodiment, the iron core 2 is made of a high-permeability material. The high-permeability material can reduce the exciting current in the housing and make the product more secure. Among them, the iron core is formed by butting two C-shaped iron cores.

[0045] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A voltage transformer, characterized in that: Comprising: A housing and an instrument transformer body. The instrument transformer body includes an iron core, a secondary coil, and a primary coil. An insulating skeleton is fixedly arranged outside the iron core, the secondary coil is wound outside the insulating skeleton, an insulating layer is wound outside the secondary coil, the primary coil is wound outside the insulating layer, and both the primary coil and the secondary coil are used to connect to external circuits. The housing is formed by pouring an insulating material outside the instrument transformer body, and the instrument transformer body is wrapped by the housing and sealed inside the housing.

2. The voltage transformer according to claim 1, characterized in that: Also included are a primary connector and a secondary connector. Both the primary connector and the secondary connector are fixedly installed on the housing and extend into the housing. The primary connector is connected to the primary coil through a primary lead, the secondary connector is connected to the secondary coil through a secondary lead, and both the primary connector and the secondary connector are used to connect to an external circuit.

3. The voltage transformer according to claim 2, characterized in that: Also included are a primary insert and a secondary insert. Both the primary insert and the secondary insert are embedded in the housing and extend into the housing. Threaded holes are provided on both the primary insert and the secondary insert. Both the primary connector and the secondary connector are screws. The primary connector is threadedly connected to the threaded hole on the primary insert, and the secondary connector is threadedly connected to the threaded hole on the secondary insert. One end of the primary lead away from the primary coil is connected to the insert, and one end of the secondary lead away from the secondary coil is connected to the secondary insert.

4. The voltage transformer according to claim 3, characterized in that: The secondary coil includes an inner secondary coil and an outer secondary coil. The insulating layer includes a first insulating layer and a second insulating layer. The inner secondary coil is wound outside the insulating skeleton, the first insulating layer is wound outside the inner secondary coil, the outer secondary coil is wound outside the first insulating layer, the second insulating layer is wound outside the outer secondary coil, and the primary coil is wound outside the second insulating layer. Both the inner secondary coil and the outer secondary coil are used to connect to an external circuit.

5. The potential transformer according to claim 4, characterized in that: There are two primary connectors and two primary leads respectively. The secondary connector includes two inner secondary connectors and two outer secondary connectors. The secondary lead includes two inner secondary leads and two outer secondary leads. The two primary connectors are respectively connected to the primary coil through the two primary leads. The two inner secondary connectors are respectively connected to the inner secondary coil through the two inner secondary leads. The two outer secondary connectors are respectively connected to the outer secondary coil through the two outer secondary leads. Each primary connector, each inner secondary connector, and each outer secondary connector are all used to connect to an external circuit.

6. The voltage transformer according to claim 5, characterized in that: There are two primary inserts. The secondary insert includes two inner secondary inserts and two outer secondary inserts. The inner secondary connector is threadedly connected to the threaded hole on the inner secondary insert. The outer secondary connector is threadedly connected to the threaded hole on the outer secondary insert. One end of the primary lead away from the primary coil is connected to the insert. One end of the inner secondary lead away from the inner secondary coil is connected to the inner secondary insert. One end of the outer secondary lead away from the outer secondary coil is connected to the outer secondary insert.

7. The voltage transformer according to claim 1, characterized in that: The outer shell is made of epoxy resin casting.

8. The voltage transformer according to claim 1, characterized in that: It further includes a bottom plate and a plurality of bottom foot inserts. The bottom foot inserts are embedded in the bottom of the outer shell, and one of the bottom foot inserts extends into the interior of the outer shell. The bottom foot inserts are connected to the bottom plate by countersunk head screws, and the bottom plate can conduct electricity.

9. The voltage transformer according to claim 8, wherein: It further includes a shielded wire and a grounding bolt. One end of the shielded wire is connected to the iron core, and the other end is connected to the bottom foot insert extending into the interior of the outer shell. The grounding bolt is fixedly connected to the bottom plate and is used to connect directly or indirectly to the ground.

10. The voltage transformer according to claim 1, characterized in that: The iron core is a high-permeability iron core.

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