Anti-vibration zero sequence mutual inductor

Abstract

The utility model relates to an anti-vibration type zero sequence mutual inductor which comprises a shell, a round hole is formed in the shell, a junction box is fixed to the side face of the shell, a gasket, an insert, a first coil and a second coil are further arranged in the shell, four supporting feet protrude outwards from the outer contour of the gasket, and the first coil and the second coil are placed on the two sides of the gasket respectively. The gasket, the first coil and the second coil are wound into a whole through the bandage, a threaded hole is formed in the insert, the end, provided with an opening of the threaded hole, of the insert is welded to the first threading face, the other end of the insert is welded to the supporting foot, and epoxy resin is poured in a blank area in the insert shell. By utilizing the anti-vibration zero-sequence mutual inductor designed by the utility model, the problem that in the prior art, a zero-sequence mutual inductor is difficult to fix during die filling or a coil is partially exposed after pouring due to the fact that a pouring layer is not uniform can be solved; and a conventional zero-sequence mutual inductor can gradually generate local cracking and even falling off due to vibration during long-term operation.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical components, in particular to a vibration-resistant zero-sequence mutual inductor. Background Art

[0002] Zero-sequence transformer is an electrical component that is used in conjunction with relay protection devices or signals when zero-sequence current is generated in the power system to activate the device components to achieve protection or monitoring. Zero-sequence transformers are widely used in protection and monitoring control devices in power systems. They can monitor the operating status of three-phase circuits and detect whether there is zero-sequence current, thereby ensuring the normal operation of the power system. Specific applications include detecting zero-sequence current in resistive grounding, non-resistive grounding or grounding capacitance in power systems; for on-site protection during overcurrent, overload, short circuit and other faults; combined with telecontrol devices to form a distance protection system.

[0003] In the prior art, during the manufacturing process of the zero-sequence transformer, the zero-sequence coil may be difficult to fix during mold installation or the casting layer may be uneven, resulting in partial exposure of the coil after casting. In addition, the conventional zero-sequence transformer may gradually develop local cracks or even fall off due to vibration during long-term operation.

[0004] Therefore, the prior art has defects and needs to be improved and developed. Utility Model Content

[0005] The embodiment of the utility model provides a vibration-resistant zero-sequence transformer, which is used to solve the technical problems in the prior art that the zero-sequence transformer is difficult to fix when installing the mold or the casting layer is uneven, resulting in partial exposure of the coil after casting, and the conventional zero-sequence transformer will gradually produce local cracks or even fall off due to vibration during long-term operation.

[0006] An embodiment of the utility model provides a vibration-resistant zero-sequence mutual inductor, comprising a shell, the shell being provided with a circular hole penetrating a first threading surface and a second threading surface of the shell, the side surface of the shell being parallel to the axis of the circular hole, two junction boxes being fixed on the side surface, the shell also comprising a gasket, an insert, a first coil and a second coil, the gasket being a circular ring and being coaxial with the circular hole, the inner diameter of the circular ring being larger than the diameter of the circular hole, four legs protruding outward from the outer contour of the gasket, the distance between any adjacent legs being the same, the first coil and the second coil being respectively placed on the circular surface of the gasket, and the gasket, the first coil and the second coil being wound as a whole by a bandage, a threaded hole being provided in the insert, one end of the insert having the opening of the threaded hole being welded to the first threading surface, the other end of the insert being welded to the leg, and the blank area of ​​the insert in the shell being poured with epoxy resin.

[0007] Furthermore, the gasket has an opening, which is opened between one group of adjacent legs and is located on the circular ring of the gasket.

[0008] Furthermore, both ends of the opening on the gasket are configured as chamfered structures.

[0009] Furthermore, the gasket is a Q235 gasket.

[0010] Furthermore, after the bandage is annularly wrapped, each week's bandage covers at least 1 / 2 of the width of last week's bandage.

[0011] Furthermore, one end of the insert welded to the support leg is configured as a chamfered structure.

[0012] Furthermore, the surface of the insert for contacting the epoxy resin is provided with knurling.

[0013] Furthermore, the insert is a segmented insert, which is divided into at least two segments, and a groove is provided between any two adjacent segments.

[0014] Furthermore, the insert is a galvanized insert.

[0015] Beneficial effects:

[0016] It can be known from the above technical scheme that the utility model provides a vibration-resistant zero-sequence transformer, which is fixed as an integral structure by wrapping the first coil and the second coil on both sides of the gasket with a bandage, and then the gasket, the first coil and the second coil fixed as an integral structure are fixed to the shell again by welding the insert to the first threading surface and the support leg. When the epoxy resin is poured into the shell, the shell, the insert, the gasket, the first coil and the second coil are fixed to each other, and the pouring of the epoxy resin is smooth and the pouring layer is uniform, and there is no problem of the coil being exposed after pouring. When the epoxy resin fills the blank area in the shell, the insert, the gasket, the first coil and the second coil will not be able to move. During actual operation and use, a vibration-resistant zero-sequence transformer will not crack or fall off, ensuring the stable operation of a vibration-resistant zero-sequence transformer.

[0017] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0018] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the teachings of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are not drawn to scale according to actual reference objects. In the accompanying drawings, each identical or approximately identical component shown in each figure may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a front view of a vibration-resistant zero-sequence transformer according to an embodiment of the present application.

[0021] Figure 2 This is a left view of a vibration-resistant zero-sequence transformer according to an embodiment of the present application.

[0022] Figure 3 This is a first cross-sectional view of a vibration-resistant zero-sequence transformer according to an embodiment of the present application.

[0023] Figure 4 This is a second cross-sectional view of a vibration-resistant zero-sequence transformer according to an embodiment of the present application.

[0024] Figure 5 This is a front view of a gasket of a vibration-resistant zero-sequence transformer according to an embodiment of the present application.

[0025] Figure 6 This is a left view of a gasket of a vibration-resistant zero-sequence transformer according to an embodiment of the present application.

[0026] Figure 7 This is a structural diagram of an insert of a vibration-resistant zero-sequence transformer according to an embodiment of the present application.

[0027] Description of Figure Numbers:

[0028] Housing 1; junction box 2; gasket 3; leg 301; first coil 4; second coil 5; insert 6; bandage 7. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Unless otherwise defined, the technical terms or scientific terms used herein should be the usual meanings understood by people with general skills in the field to which the utility model belongs.

[0030] The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the presence of at least one.

[0031] The words "include" or "comprises" and the like mean that the elements or objects appearing before "includes" or "comprises" include the features, wholes, steps, operations, elements and / or components listed after "includes" or "comprises", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] In the prior art, during the manufacturing process of the zero-sequence transformer, the zero-sequence coil may be difficult to fix during mold installation or the casting layer may be uneven, resulting in partial exposure of the coil after casting. In addition, the conventional zero-sequence transformer may gradually develop local cracks or even fall off due to vibration during long-term operation.

[0033] In view of this, the embodiment of the utility model provides a vibration-resistant zero-sequence transformer, referring to Figure 1 to Figure 4 , including a shell 1, a circular hole penetrating a first threading surface and a second threading surface of the shell 1 is opened on the shell 1, the side of the shell 1 is parallel to the axis of the circular hole, and two junction boxes 2 are fixed on the side, and the junction box 2 is used to electrically connect the cable. The shell 1 also includes a gasket 3, an insert 6, a first coil 4 and a second coil 5. The gasket 3 is a circular ring and is coaxial with the circular hole. The inner diameter of the circular ring is larger than the diameter of the circular hole. Four legs 301 protrude outward from the outer contour of the gasket 3, and the distance between any adjacent legs 301 is the same. The first coil 4 and the second coil 5 are respectively placed on the circular surface of the gasket 3, and the gasket 3, the first coil 4 and the second coil 5 are annularly wound as a whole through a bandage 7. A threaded hole is provided in the insert 6, and one end of the insert 6 having the threaded hole is welded to the first threading surface, and the other end of the insert 6 is welded to the leg 301. The blank area in the shell 1 of the insert 6 is poured with epoxy resin.

[0034] The housing 1 is a structure formed by snapping together a plurality of parts. In some embodiments, the housing 1 is formed by snapping together two parts, one of which makes the housing 1 a container for holding poured epoxy resin, and the other part is used to seal the housing 1. The internal circuit setting and connection of a vibration-resistant zero-sequence transformer are similar to those of existing zero-sequence transformers. External electrical components are connected through a junction box 2 to determine the circuit status of the cable passing through the circular hole. The first threading surface and the second threading surface refer to the surfaces of the housing 1 with a circular opening, and the diameter of the circular opening is the same as the diameter of the circular hole. One end of the cable insert 6 having a threaded hole is welded to the first threading surface, and the threaded hole is exposed to the outside for bolt entry. When a vibration-resistant zero-sequence transformer is installed, it is installed and fixed by screwing the bolt into the threaded hole.

[0035] In some embodiments, reference Figure 5-6 The gasket 3 has an opening, which is opened between one group of adjacent legs 301 and is located on the ring of the gasket 3.

[0036] If a vibration-resistant zero-sequence transformer generates eddy current during operation, it will not only increase energy consumption, but also easily lead to safety hazards. Therefore, by providing an opening on the gasket 3, it is possible to effectively prevent the vibration-resistant zero-sequence transformer from generating eddy current during use, thereby improving the use safety and operation stability of the vibration-resistant zero-sequence transformer.

[0037] In some embodiments, reference Figure 5 Both ends of the opening on the gasket 3 are set as chamfered structures.

[0038] Chamfer structures are provided at both ends of the opening of the gasket 3. In some embodiments, the chamfers are provided as rounded corners, which can effectively prevent arc discharge and improve the use safety and operation stability of a vibration-resistant zero-sequence transformer.

[0039] In some embodiments, the gasket 3 is a Q235 gasket.

[0040] The gasket 3 is selected as a Q235 gasket, i.e., a common carbon structural steel gasket, which has excellent plasticity and toughness, and its strength and hardness are relatively high. In addition, the Q235 gasket also has good welding performance and processing performance, and has excellent welding performance and is easy to be welded with the insert 6.

[0041] In some embodiments, after the bandage 7 is annularly wrapped, each week's bandage 7 covers at least 1 / 2 of the width of the previous week's bandage 7 .

[0042] The material of the bandage 7 used for the annular winding is an insulating material, and the bandage 7 can be a polyester bandage, which has the function of preventing short circuits, errors and out-of-tolerances.

[0043] In some embodiments, reference Figure 7 The insert 6 is welded to one end of the support leg 301 and is configured as a chamfered structure.

[0044] In some embodiments, reference Figure 7 The surface of the insert 6 for contacting the epoxy resin is provided with knurling.

[0045] In some embodiments, reference Figure 7 The insert 6 is a segmented insert, and the insert 6 is divided into at least two segments, and a groove is provided between any two adjacent segments.

[0046] The insert 6 is chamfered, knurled on the surface, and segmented, all for the purpose of making the insert 6 more secure after being cast with epoxy resin. If a vibration-resistant zero-sequence transformer is used at high altitudes, since the transformer itself has a certain thickness, if the insert 6 is too shallow, the vibration-resistant zero-sequence transformer vibrates during the hoisting process and the screwing process, and the insert 6 rubs against the resin and is easy to fall off. By designing the insert 6 to be segmented, the insert 6 is easier to fix and has a good fixing effect.

[0047] In some embodiments, the insert 6 is a galvanized insert.

[0048] By galvanizing the insert 6, the insert 6 can be rust-proof, and a vibration-resistant zero-sequence transformer can operate stably in a corrosive environment and has a long service life without affecting the internal parts of the housing 1, so that the internal parts do not fall off.

[0049] In some embodiments, if a vibration-resistant zero-sequence transformer is operated outdoors, the outer surface of the housing 1 is covered with at least one rust-proof layer, such as a silicone rubber layer, and the junction box 2 is provided with waterproof and rust-proof treatments, such as designing a water retaining plate or also providing an rust-proof layer at the junction of the junction box. By covering the housing 1 with a silicone rubber layer, the housing 1 can be rust-proof and collision-proof, and a vibration-resistant zero-sequence transformer can adapt to different environments and operate stably.

[0050] In summary, the utility model provides a vibration-resistant zero-sequence transformer, which is fixed as an integral structure by wrapping the first coil 4 and the second coil 5 on both sides of the gasket 3 with a bandage 7, and then the gasket 3, the first coil 4 and the second coil 5 fixed as an integral structure are fixed to the shell 1 again by welding the insert 6 to the first threading surface and the support leg 301. When the epoxy resin is poured into the shell 1, since the shell 1, the insert 6, the gasket 3, the first coil 4 and the second coil 5 are fixed to each other, the pouring of the epoxy resin is smooth and the pouring layer is uniform, and there is no problem of the coil being exposed after pouring. When the epoxy resin fills the blank area in the shell 1, the insert 6, the gasket 3, the first coil 4 and the second coil 5 will not be able to move. During actual operation and use, the vibration-resistant zero-sequence transformer will not crack or fall off, thereby ensuring the stable operation of the vibration-resistant zero-sequence transformer. In addition, by opening the gasket 3 and chamfering the two ends of the opening, the generation of eddy currents during the use of a vibration-resistant zero-sequence transformer can be effectively prevented; by designing the insert 6, the insert 6 is segmented, one end is chamfered, and the surface is knurled, so that the insert 6 can effectively fix the first threading surface and the gasket 3, and the friction force is increased in the epoxy resin, making it less likely to fall off, thereby improving the operating stability of the vibration-resistant zero-sequence transformer.

[0051] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A vibration-proof zero-sequence transformer, comprising a housing, the housing having a circular hole penetrating a first threading surface and a second threading surface of the housing, a side surface of the housing being parallel to the axis of the circular hole, and two junction boxes being fixed on the side surface, characterized in that: The shell also includes a gasket, an insert, a first coil and a second coil. The gasket is a circular ring and is coaxial with the circular hole. The inner diameter of the circular ring is larger than the diameter of the circular hole. Four legs protrude outward from the outer contour of the gasket, and the distance between any adjacent legs is the same. The first coil and the second coil are respectively placed on the circular surface of the gasket, and the gasket, the first coil and the second coil are annularly wound as a whole through a bandage. A threaded hole is provided in the insert, and one end of the insert having the opening of the threaded hole is welded to the first threading surface, and the other end of the insert is welded to the leg. The blank area of ​​the insert in the shell is poured with epoxy resin.

2. A vibration-resistant zero-sequence transformer according to claim 1, characterized in that: The gasket is provided with an opening, which is opened between one group of adjacent legs and is located on the circular ring of the gasket.

3. A vibration-resistant zero-sequence transformer according to claim 2, characterized in that: Both ends of the opening on the gasket are arranged as chamfered structures.

4. A vibration-resistant zero-sequence transformer according to claim 1, 2 or 3, characterized in that: The gasket is a Q235 gasket.

5. The vibration-resistant zero-sequence transformer according to claim 1, characterized in that: After the bandage is annularly wrapped, each week's bandage covers at least 1 / 2 of the width of last week's bandage.

6. The vibration-resistant zero-sequence transformer according to claim 1, characterized in that: One end of the insert welded to the support leg is configured as a chamfered structure.

7. The vibration-resistant zero-sequence transformer according to claim 6, characterized in that: The surface of the insert for contacting the epoxy resin is provided with knurling.

8. The vibration-resistant zero-sequence transformer according to claim 7, characterized in that: The insert is a segmented insert, which is divided into at least two segments, and a groove is provided between any two adjacent segments.

9. A vibration-resistant zero-sequence transformer according to claim 6, 7 or 8, characterized in that: The insert is a galvanized insert.

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