Outdoor zero sequence current transformer

Abstract

The utility model relates to the technical field of current transformers, and discloses an outdoor zero sequence current transformer which comprises two outer shells, the contact surfaces of the two outer shells are jointly provided with counterbores, bolts are arranged in the counterbores to lock and close the two outer shells, the outer shells are hollow, iron core assemblies are arranged in cavities of the outer shells, and the iron core assemblies are arranged in the cavities of the outer shells. The iron core assembly comprises half core bodies, a lug part and an anti-drop bulge, one half core body is arranged in the belly of each outer shell, the lug part is fixedly connected with one half core body, and in the process that a bolt penetrates through a through hole to lock the two outer shell parts, one half core body can abut against the end face of the other half core body to form a closed circular ring; when the two half core bodies form the annular structure, relative slippage can be restrained, the connection stability is higher, under the extrusion force of the anti-falling protrusions and the lug parts, the other sections of the two half core bodies are kept in full contact, and the formed annular structure is more stable and higher in strength.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to an outdoor zero-sequence current transformer. Background Technique

[0002] The prior art discloses an outdoor zero-sequence current transformer (CN202210187203.0), which includes an upper shell and a lower shell that are semi-circular shells. After the upper shell and the lower shell are joined together, a circular shell is formed. Inside the circular shell, there is a circular hollow winding skeleton formed by joining two semi-circular hollow winding skeletons. Inside the circular cavity of the circular hollow winding skeleton, there is a circular iron core, and a coil is wound on the circular hollow winding skeleton;

[0003] In the prior art, two semi-circular iron cores are wrapped by a housing, and a circle is formed by closing the two semi-rings. The contact force between the cross-sections of the two semi-rings completely depends on the housing, and there will be a phenomenon of relative displacement between the cross-sections of the two semi-ring iron cores. The overall strength and structure need to be optimized.

[0004] Therefore, we propose an outdoor zero-sequence current transformer. Content of the Utility Model

[0005] The utility model mainly solves the technical problems existing in the above-mentioned prior art, and provides an outdoor zero-sequence current transformer.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme. An outdoor zero-sequence current transformer includes two outer shells. A countersunk hole is jointly opened on the contact surface of the two outer shells, and a bolt is provided in the countersunk hole to lock and close the two outer shells. The inside of the outer shell is hollow, and an iron core assembly is provided in the cavity of the outer shell. The iron core assembly includes a semi-core body, an ear part and an anti-detachment protrusion. One semi-core body is arranged in the belly of each outer shell. The ear part is fixedly connected to one of the semi-core bodies, and the anti-detachment protrusion is fixedly connected to the other semi-core body. The anti-detachment protrusion is clamped with the ear part to lock the two semi-core bodies and form a closed ring structure.

[0007] As a preferred mode of the utility model, the iron core assembly further includes a limiting groove opened on the wall surface of the ear part for limiting the anti-detachment protrusion, and the anti-detachment protrusion can be inserted into the limiting groove.

[0008] As a preferred mode of the utility model, the semi-core body forms a semi-ring structure, and the two semi-core bodies jointly form a closed iron ring. The ear part and the anti-detachment protrusion are respectively fixedly installed on the outer circumferential surfaces of the two semi-core bodies.

[0009] As a preferred mode of the utility model, the ear part forms a rectangular plate structure, the ear part is integrally formed with one of the semi-core bodies, and the limiting groove is opened at the bottom surface position of the ear part.

[0010] As a preferred embodiment of the utility model, the anti-slip protrusion forms a block structure with a trapezoidal horizontal cross section, the anti-slip protrusion is integrally formed with the other half of the core body, and the anti-slip protrusion and the limiting groove are used in conjunction with each other.

[0011] As a preferred embodiment of the present invention, each end surface of the outer shell is provided with a slot for installing a half core, and the half core is inserted into the corresponding slot.

[0012] As a preferred embodiment of the present invention, a wall surface of the outer shell is further provided with an avoidance groove connected to the slot, the avoidance groove is matched with the ear, and the ear can be embedded in the avoidance groove.

[0013] Beneficial Effects

[0014] The utility model provides an outdoor zero-sequence current transformer, which has the following beneficial effects:

[0015] 1. In an outdoor zero-sequence current transformer, during the process of locking the two parts of the outer shell by bolts passing through the through holes, one of the half cores can contact the end face of the other half core to form a closed circular ring. When the two half cores form a ring structure, relative slippage can be suppressed, and the connection stability is stronger. The bolts apply pressure to the ears, and on the basis of ensuring that the two half cores are in full contact, direct squeezing and pushing force is avoided on the half cores, thereby reducing the probability of damage to the two half cores under the action of the bolts, and the other cross-sections of the two half cores are relatively flat. Under the squeezing and pushing force of the anti-slip protrusion and the ears, the other cross-sections of the two half cores remain in full contact, and the formed circular ring structure is more stable and has higher strength.

[0016] 2. This outdoor zero-sequence current transformer is provided with a limit groove. When the two half cores are closed, the anti-dropping protrusion is inserted into the limit groove, which can suppress the relative slippage of the two half cores on the horizontal plane, realize reinforcement and improve strength.

[0017] 3. By setting the slot and the avoidance groove, the half core can be inserted into the slot to complete the installation of one half core. With the avoidance groove limiting the ear, when the two half cores are closed, they have higher strength and a more stable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is one of the three-dimensional diagrams of the utility model;

[0019] Figure 2 This is a three-dimensional diagram of the half core and the outer shell of the utility model;

[0020] Figure 3 This is a three-dimensional diagram of the outer shell of the utility model;

[0021] Figure 4This is the closed three-dimensional view of the two half-cores of the utility model;

[0022] Figure 5 This is one of the three-dimensional views of the half-core of the utility model;

[0023] Figure 6 This is the second three-dimensional view of the half-core.

[0024] Legend: 10. Outer housing; 11. Countersunk hole; 20. Half-core; 21. Slot; 22. Avoidance groove; 23. Ear; 24. Anti-detachment protrusion; 25. Limit groove. Detailed implementation mode

[0025] An outdoor zero-sequence current transformer, as Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, includes two outer housings 10. The contact surfaces of the two outer housings 10 are jointly provided with countersunk holes 11. Bolts are arranged in the countersunk holes 11 to lock and close the two outer housings 10. The interior of the outer housing 10 is hollow, and a core assembly is arranged in the cavity of the outer housing 10. The core assembly includes a half-core 20, an ear 23 and an anti-detachment protrusion 24. One half-core 20 is arranged in the abdomen of each outer housing 10. The ear 23 is fixedly connected to one of the half-cores 20, and the anti-detachment protrusion 24 is fixedly connected to the other half-core 20. The anti-detachment protrusion 24 is clamped with the ear 23 to lock the two half-cores 20 and form a closed ring structure. The half-core 20 forms a semi-ring structure, and the two half-cores 20 jointly form a closed iron ring. The ear 23 and the anti-detachment protrusion 24 are respectively fixedly installed on the outer circumferential surfaces of the two half-cores 20. The ear 23 forms a rectangular plate structure and is integrally formed with one of the half-cores 20. The limit groove 25 is opened at the bottom surface position of the ear 23. In this solution, a semi-circular groove is opened at the central position of the outer housing 10. When the two outer housings 10 are closed, the semi-circular grooves form a circular hole for passing the wire. When the two half-cores 20 are closed, through the insertion of the anti-detachment protrusion 24 and the ear 23, and through holes are arranged on the wall surface of the ear 23. When the two parts of the outer housing 10 are locked by bolts passing through the through holes, one of the half-cores 20 can abut against the end surface of the other half-core 20 to form a closed ring. When the two half-cores 20 form a ring structure, relative sliding can be inhibited, and the connection stability is stronger. The bolts exert pressure on the ear 23. On the basis of ensuring full contact between the two half-cores 20, directly applying extrusion force to the half-cores 20 is avoided, and the probability of damage to the two half-cores 20 under the action of the bolts is reduced. The other cross-section of the two half-cores 20 is relatively flat. Under the extrusion force of the anti-detachment protrusion 24 and the ear 23, the other cross-section of the two half-cores 20 maintains full contact, and the formed ring structure is more stable and has higher strength.

[0026] As Figure 5 andFigure 6 As shown, the iron core assembly further includes a limiting groove 25 formed on the wall surface of the ear part 23 for limiting and preventing the protrusion 24 from coming off. The anti-disengagement protrusion 24 can be inserted into the limiting groove 25. The anti-disengagement protrusion 24 forms a block structure with a trapezoidal horizontal cross-section. The anti-disengagement protrusion 24 is integrally formed with the other half core body 20. The anti-disengagement protrusion 24 and the limiting groove 25 are used in cooperation. By providing the limiting groove 25, when the two half core bodies 20 are closed, the anti-disengagement protrusion 24 is inserted into the limiting groove 25, which can inhibit the relative sliding of the two half core bodies 20 on the horizontal plane, achieve reinforcement and improve strength.

[0027] As Figure 3 shown, each end face of the outer shell 10 is provided with a slot 21 for installing the half core body 20. The half core body 20 is inserted into the corresponding slot 21. The wall surface of the outer shell 10 is also provided with an avoidance groove 22 communicating with the slot 21. The avoidance groove 22 is adapted to the ear part 23, and the ear part 23 can be embedded in the avoidance groove 22. By providing the slot 21 and the avoidance groove 22, the half core body 20 can be inserted into the slot 21 to complete the installation of one half core body 20. With the cooperation of the avoidance groove 22 to limit the ear part 23, when the two half core bodies 20 are closed, it has higher strength and a more stable structure.

[0028] The working principle of the present utility model: A semi-circular groove is provided at the central position of the outer shell 10. When the two outer shells 10 are closed, the semi-circular grooves form a circular hole for passing through the wire. When the two half core bodies 20 are closed, the half core body 20 can be inserted into the slot 21 to complete the installation of one half core body 20. With the cooperation of the avoidance groove 22 to limit the ear part 23, through the insertion connection of the anti-disengagement protrusion 24 and the ear part 23, and through holes are provided on the wall surface of the ear part 23. When the two parts of the outer shell 10 are locked by bolts passing through the through holes, one half core body 20 can abut against the end face of the other half core body 20 to form a closed ring. When the two half core bodies 20 are closed, the anti-disengagement protrusion 24 is inserted into the limiting groove 25, which can inhibit the relative sliding of the two half core bodies 20 on the horizontal plane, so that the other cross-section of the two half core bodies 20 remains in full contact, and the formed ring structure is more stable.

[0029] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An outdoor zero-sequence current transformer, comprising two outer housings (10), a countersunk hole (11) is commonly opened on the contact surface of the two outer housings (10), and a bolt is arranged in the countersunk hole (11) to lock and close the two outer housings (10), and it is characterized in that: The inner part of the outer shell (10) is hollow, and an iron core assembly is arranged in the cavity of the outer shell (10). The iron core assembly includes a half-core body (20), an ear part (23), and an anti-disengagement protrusion (24). One half-core body (20) is arranged in the abdomen of each outer shell (10). The ear part (23) is fixedly connected to one of the half-core bodies (20), and the anti-disengagement protrusion (24) is fixedly connected to the other half-core body (20). The anti-disengagement protrusion (24) and the ear part (23) are snap-fitted to lock the two half-core bodies (20) and form a closed ring structure.

2. The outdoor zero-sequence current transformer according to claim 1, characterized in that: The iron core assembly further includes a limiting groove (25) opened on the wall surface of the ear part (23) for limiting the anti-disengagement protrusion (24), and the anti-disengagement protrusion (24) can be inserted into the limiting groove (25).

3. The outdoor zero-sequence current transformer according to claim 1, characterized in that: The half-core body (20) forms a semi-circular structure, and the two half-core bodies (20) together form a closed iron ring. The ear part (23) and the anti-disengagement protrusion (24) are respectively fixedly installed on the outer circumferential surfaces of the two half-core bodies (20).

4. The outdoor zero-sequence current transformer according to claim 2, characterized in that: The ear part (23) forms a rectangular plate structure and is integrally formed with one of the half-core bodies (20). The limiting groove (25) is opened at the bottom surface position of the ear part (23).

5. The outdoor zero-sequence current transformer according to claim 2, wherein: The anti-disengagement protrusion (24) forms a block structure with a trapezoidal horizontal cross-section and is integrally formed with the other half-core body (20). The anti-disengagement protrusion (24) and the limiting groove (25) are used in cooperation with each other.

6. The outdoor zero-sequence current transformer according to claim 1, characterized in that: A slot (21) for installing the half-core body (20) is opened on the end surface of each outer shell (10), and the half-core body (20) is inserted into the corresponding slot (21).

7. The outdoor zero-sequence current transformer according to claim 1, wherein: An avoidance groove (22) communicating with the slot (21) is further opened on the wall surface of the outer shell (10). The avoidance groove (22) is adapted to the ear part (23), and the ear part (23) can be embedded in the avoidance groove (22).

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