Zero sequence mutual inductor module

Abstract

The utility model discloses a zero-sequence mutual inductor module, which comprises a shell, a zero-sequence mutual inductor and at least two groups of main line conductor assemblies, the main line conductor assembly comprises a first screw, a first insert, a cross-core conductor, a second screw and a second insert; the shell is provided with a containing cavity, and the cross-core conductor and the zero-sequence mutual inductor are arranged in the containing cavity; the first insert and the second insert are embedded in the shell, one end of each insert is exposed on the outer surface of the shell, and the other end of each insert is exposed in the accommodating cavity; the first screw is connected with one end of the first insert exposed out of the shell, and the second screw is connected with one end of the second insert exposed out of the shell and used for external wiring; the cross-core conductor penetrates through a center hole of the zero sequence mutual inductor, and the two ends of the cross-core conductor are electrically connected with the end, located in the containing cavity, of the first insert and the end, located in the containing cavity, of the second insert respectively; the electric connector has the characteristics of simple wiring and good sealing effect.

Description

Technical Field

[0001] The present application relates to the field of low-voltage switchgear, and in particular to a zero-sequence transformer module. Background Art

[0002] In the field of explosion-proof circuit breakers, users often require leakage protection (or residual current protection). This function relies on zero-sequence transformers to detect leakage in the circuit. This requires zero-sequence transformers to be installed on all main circuits (or, in other words, all main circuit conductors) to ensure detection.

[0003] Connecting the zero-sequence transformer module to the main line requires a wiring structure. Explosion-proof circuit breakers place high demands on product sealing performance, which places high demands on the wiring of the zero-sequence transformer module. Existing wiring structures often fail to meet these requirements.

[0004] Therefore, how to rearrange the wiring structure with better sealing performance is a direction worthy of research. Summary of the Invention

[0005] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a zero-sequence transformer module.

[0006] The present application provides: a zero-sequence transformer module, which includes a housing, a zero-sequence transformer and at least two groups of main line conductor assemblies; the main line conductor assembly includes a first screw, a first insert, a through-hole conductor, a second screw and a second insert; the housing has a accommodating cavity, and the through-hole conductor and the zero-sequence transformer are arranged in the accommodating cavity; the first insert and the second insert are both embedded in the housing, and each has one end exposed on the outer surface of the housing and the other end exposed in the accommodating cavity; the first screw is connected to the end of the first insert exposed in the housing, and the second screw is connected to the end of the second insert exposed in the housing for external wiring; the through-hole conductor passes through the center hole of the zero-sequence transformer, and the two ends of the through-hole conductor are electrically connected to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity, respectively.

[0007] In some embodiments of the present application, a first terminal slot and a first mounting slot are provided on the housing, the first mounting slot is connected to the first terminal slot, the first screw is in the first mounting slot, and the first terminal slot is used to place the first terminal.

[0008] In some embodiments of the present application, a second terminal slot and a second mounting slot are provided on the housing, the second mounting slot is connected to the second terminal slot, the second screw is in the second mounting slot, and the second terminal slot is used to place the second terminal.

[0009] In some embodiments of the present application, a circuit board and an auxiliary terminal are further included; the auxiliary terminal includes an auxiliary insert and an auxiliary screw; the auxiliary insert is embedded in the shell, one end of the auxiliary insert is exposed outside the shell and connected to the auxiliary screw, and the other end of the auxiliary insert is exposed in the accommodating cavity; the circuit board is located in the accommodating cavity and is electrically connected to the end of the auxiliary insert exposed in the accommodating cavity.

[0010] In some embodiments of the present application, in the height direction, the auxiliary screw is higher than the first screw and the second screw.

[0011] In some embodiments of the present application, in the length direction, the auxiliary screw is located between the first screw and the second screw, and the auxiliary screw is arranged close to the first screw or close to the second screw.

[0012] In some embodiments of the present application, an auxiliary terminal slot is provided on the housing, one end of the auxiliary insert is exposed at the bottom of the auxiliary terminal slot, and the auxiliary screw is located in the auxiliary terminal slot.

[0013] In some embodiments of the present application, the through-conductor is a flexible connection, and both ends of the through-conductor are respectively welded to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity.

[0014] In some embodiments of the present application, the through-conductor is a flexible connection, and connecting plates are welded at both ends of the through-conductor. The two connecting plates are fixed to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity through fasteners.

[0015] In some embodiments of the present application, the through-conductor is an integrally formed hard busbar, and both ends of the through-conductor are fixed to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity by fasteners respectively.

[0016] In some embodiments of the present application, the through-conductor is a hard busbar assembly, and the two ends of the through-conductor are fixed to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity by fasteners respectively. The hard busbar assembly is formed by at least two independently formed hard busbar sub-components fixed by rivets, bolts or welding.

[0017] In some embodiments of the present application, at least the portion of all through-conductors in the center hole of the zero-sequence transformer is separated by sheathing with an insulating tube or wrapping with glue.

[0018] In some embodiments of the present application, an insulating spacer is further included, which cooperates with the zero-sequence transformer to separate all the through-conductors at least in the center hole of the zero-sequence transformer.

[0019] In some embodiments of the present application, the insulating frame includes a first bracket and a second bracket; the first bracket is located on one side of the zero-sequence transformer, and the first bracket has a first plug-in portion extending into the center hole of the zero-sequence transformer; the second bracket is located on the other side of the zero-sequence transformer, and the second bracket has a second plug-in portion extending into the center hole of the zero-sequence transformer; the first plug-in portion and the second plug-in portion are plugged into each other, and after plugging in, the first bracket and the second bracket jointly separate all the through-conductors at least in the center hole of the zero-sequence transformer.

[0020] In some embodiments of the present application, the insulating spacer includes at least two groups of conductor penetration structures, and all conductor penetration structures adopt any one or a combination of the following two structures:

[0021] Structure 1: The insulating spacer is provided with an assembly hole, which is opened along a first direction, the first direction is parallel to the axial direction of the center hole of the zero-sequence transformer, the assembly hole and the center hole of the zero-sequence transformer have an overlapping portion, each assembly hole is for a through-core conductor to pass through, and the number of the assembly holes is one or two;

[0022] Structure 2: The insulating spacer includes a main body, and two side branches are arranged on one side of the main body. The two side branches arranged on the same side of the main body are spaced apart in a first direction, and the first direction is parallel to the axial direction of the center hole of the zero-sequence transformer. The two side branches arranged on the same side of the main body and the main body jointly form an assembly groove, and a part of the assembly groove is in the center hole of the zero-sequence transformer. Each assembly groove is provided with a through-core conductor, and the through-core conductor is arranged close to the groove wall of the assembly groove.

[0023] In some embodiments of the present application, the housing includes a cover shell and a sealing plate, the accommodating cavity is in the cover shell, the bottom surface of the cover shell has a mounting port, the accommodating cavity opening is connected to the mounting port, the sealing plate is embedded in the mounting port to close the accommodating cavity opening, and the cover shell and the sealing plate are fastened by screws or riveted.

[0024] In some embodiments of the present application, the housing includes a cover shell and a sealing plate, the accommodating cavity is in the cover shell, the bottom surface of the cover shell has a mounting port, the accommodating cavity opening is connected to the mounting port, the sealing plate is at least partially embedded in the mounting port to close the accommodating cavity opening, the cover shell is provided with a first annular portion surrounding the outside of the accommodating cavity opening, the sealing plate has a second annular portion, and the first annular portion and the second annular portion are staggered.

[0025] In some embodiments of the present application, the housing includes a cover shell and a sealing plate, the accommodating cavity is in the cover shell, the bottom surface of the cover shell has a mounting port, the accommodating cavity opening is connected to the mounting port, the sealing plate is at least partially embedded in the mounting port to close the accommodating cavity opening, and a glue filling structure is provided between the cover shell and the sealing plate, and the glue filling structure surrounds the accommodating cavity opening.

[0026] The beneficial effects of this application include:

[0027] The zero-sequence transformer module of the present application can be connected by screws (first screws, second screws) and inserts (first inserts, second inserts). By taking advantage of the better sealing effect of inserts compared to other existing wiring structures, the wiring structure of the zero-sequence transformer module has better sealing performance. Since the insert and the through-core conductor are already connected (electrically connected) inside the zero-sequence transformer module, as long as the external circuit is connected to the corresponding screw, this zero-sequence transformer module can be connected to the circuit, effectively identifying whether there is leakage in the circuit, and wiring is also very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A three-dimensional diagram of a zero-sequence mutual inductor module according to embodiment 1 of the present application is shown;

[0030] Figure 2 A schematic diagram of the zero-sequence mutual inductor module after removing the sealing plate in Example 1 of the present application is shown;

[0031] Figure 3 A schematic diagram of the sealing plate of Example 1 of the present application is shown;

[0032] Figure 4 A cross-sectional view and an enlarged view of the staggered structure of the zero-sequence mutual inductor module of Example 1 of the present application are shown;

[0033] Figure 5 A schematic diagram of a 14-pole main line conductor assembly according to an embodiment of the present application is shown;

[0034] Figure 6 A cross-sectional view of a main line conductor assembly according to embodiment 1 of the present application is shown;

[0035] Figure 7 1 shows a top view of the zero-sequence mutual inductor module of Example 1 of the present application;

[0036] Figure 8 A cross-sectional view of the auxiliary terminal of Example 1 of the present application is shown;

[0037] Figure 9 A three-dimensional diagram of the auxiliary terminal and circuit board of Example 1 of the present application is shown;

[0038] Figure 10A diagram showing the positional relationship of the main line conductor assembly, the zero-sequence mutual inductor, and the insulating spacer in Example 1 of the present application is shown;

[0039] Figure 11 A schematic diagram of an insulating spacer according to Example 1 of the present application is shown;

[0040] Figure 12 Schematic diagram of the first bracket and the second bracket of Example 1 of the present application is shown;

[0041] Figure 13 A schematic diagram of the cooperation between the insulating spacer and the second shape of the through-hole conductor in Example 1 of the present application is shown;

[0042] Figure 14 A schematic diagram of the cooperation between the insulating spacer and the first shape of the through-hole conductor in Example 1 of the present application is shown;

[0043] Figure 15 A schematic diagram of a through-hole conductor of the first shape in Example 1 of the present application is shown;

[0044] Figure 16 A schematic diagram of a through-hole conductor of the second shape according to Example 1 of the present application is shown;

[0045] Figure 17 A schematic diagram showing a through-conductor in accordance with embodiment 1 of the present application using a soft connection is shown;

[0046] Figure 18 A schematic diagram showing a through-conductor in accordance with embodiment 1 of the present application using a flexible connection and a terminal lug is shown;

[0047] Figure 19 A schematic diagram showing a zero-sequence mutual inductor module with three poles in Example 1 of the present application is shown;

[0048] Figure 20 A schematic diagram is shown of a zero-sequence mutual inductor module having two poles according to embodiment 1 of the present application. DETAILED DESCRIPTION

[0049] The following describes in detail embodiments of the present application. Examples of these embodiments are illustrated in the accompanying drawings, where identical or similar reference numerals throughout represent identical or similar elements or elements having identical or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and intended only to explain the present application and are not to be construed as limiting the present application.

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0051] Furthermore, the terms "primary" and "secondary" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "primary" or "secondary" may explicitly or implicitly include one or more of such features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0052] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0053] In this application, unless otherwise expressly specified or limited, "above" or "below" a main feature may mean that the main feature and the second feature are in direct contact, or that the main feature and the second feature are in indirect contact through an intermediary. Furthermore, "above," "above," and "above" a main feature may mean that the main feature is directly above or diagonally above the second feature, or simply means that the main feature is higher in level than the second feature. "below," "below," and "below" a main feature may mean that the main feature is directly below or diagonally below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0054] like Figures 1-20 As shown, an embodiment of the present application provides a zero-sequence transformer module. This zero-sequence transformer 2-00 is used in conjunction with a circuit breaker and can effectively identify whether there is leakage current in the line when connected to the line.

[0055] The zero-sequence transformer module includes:

[0056] The housing includes a cover 1-101 and a cover plate 1-102. The cover 1-101 has a receiving cavity 1-103, in which components such as the zero-sequence transformer 2-00, the insulating spacer 5-100, and the circuit board 4-00 are arranged. The bottom surface of the cover 1-101 has an installation opening 1-104. The opening of the receiving cavity is connected to the installation opening 1-104, so that components in the receiving cavity 1-103 can be installed into the receiving cavity 1-103 through the installation opening 1-104.

[0057] The sealing plate 1-102 is at least partially embedded in the mounting opening 1-104, so that the sealing plate 1-102 can seal the opening of the receiving chamber 1-103. The sealing plate 1-102 is fastened to the housing 1-101 by screws, but riveting is also an option.

[0058] The sealing plate 1-102 has a second annular portion 1-105 extending toward the housing 1-101. The second annular portion 1-105 surrounds the periphery of the opening of the receiving cavity. Similarly, the housing 1-101 has a first annular portion 1-106 surrounding the outside of the opening of the receiving cavity. After the sealing plate 1-102 and the housing 1-101 are installed, the first annular portion 1-106 and the second annular portion 1-105 intersect with each other, forming a staggered structure around the periphery of the opening of the receiving cavity, improving sealing performance.

[0059] Here, because the first annular portion 1-106 surrounds the opening of the accommodating cavity, a groove-shaped structure is formed on the side of the first annular portion 1-106 away from the opening of the accommodating cavity. Glue can be poured into this groove-shaped structure to form a glue-filled structure. This glue is poured between the sealing plate 1-102 and the housing 1-101 (surrounding the opening of the accommodating cavity), further improving the sealing performance. Of course, the groove-shaped structure required for the glue-filled structure here can also be formed without the first annular portion 1-106. For example, a groove-shaped structure for glue-filling can be formed separately on the housing 1-101.

[0060] The zero-sequence transformer 2-00 is arranged in the accommodating cavity 1-103 and has a central hole 2-01. Its central hole 2-01 is provided for all through-hole conductors 3-03.

[0061] The main line conductor assembly 3-00 is provided in at least two sets. In this embodiment, four sets are used, specifically for a four-pole circuit breaker. Each set of main line conductor assembly 3-00 includes a first screw 3-01, a first insert 3-02, a through-conductor 3-03, a second screw 3-04, and a second insert 3-05. Both the first insert 3-02 and the second insert 3-05 are insert nuts.

[0062] Among these components, the first insert 3-02 and the second insert 3-05 are embedded in the cover 1-101, and one end of the first insert 3-02 and the second insert 3-05 are exposed on the surface of the cover 1-101 (exposed on the surface here includes protruding from the surface, flush with the surface, and below the surface).

[0063] Among these components, the through-hole conductors 3-03 are disposed within the accommodating cavity 1-103. All through-hole conductors 3-03 pass through the center hole 2-01 of the zero-sequence transformer 2-00. One end of the through-hole conductor 3-03 is electrically connected to its corresponding first insert 3-02 (the end of the first insert 3-02 exposed within the accommodating cavity 1-103), and the other end of the through-hole conductor 3-03 is electrically connected to its corresponding second insert 3-05 (the end of the second insert 3-05 exposed within the accommodating cavity 1-103). Various electrical connection methods are possible. In this embodiment, screw fastening is employed; however, welding, riveting, and other methods are also possible.

[0064] The first screw 3-01 is located outside the housing 1-101 and connects to the first insert 3-02 (the first insert 3-02 is exposed at one end of the housing 1-101). The second screw 3-04 is located outside the housing 1-101 and connects to the second insert 3-05 (the first insert 3-02 is exposed at one end of the housing 1-101). This structure allows external wiring to be connected using the first and second screws 3-01 and 3-04.

[0065] The first screw 3-01 and the second screw 3-04 are more suitable for connecting external lines with wiring lugs.

[0066] To accommodate a wider range of wiring options, the housing 1-101 is provided with a first terminal slot 1-107 and a first mounting slot 1-108. The first terminal slot 1-107 is located on one side of the first terminal slot 1-107 (one side along the length of the housing 1-101). The first screw 3-01 is located within the first mounting slot 1-108 (or one end of the first insert 3-02 is exposed within the first mounting slot 1-108). The first terminal slot 1-107 is used to accommodate a first wiring terminal 1-109, which can be either a screw-type terminal or a cage-type terminal. This allows users to electrically connect the first wiring terminal 1-109 to the first screw 3-01 (using a flexible wire or a wiring lug) as needed, and then connect external circuits to the first wiring terminal 1-109.

[0067] Obviously, a second terminal slot 1-110 and a second mounting slot 1-111 are provided on the cover 1-101. The second terminal slot 1-110 is located on one side of the second terminal slot 1-110, and the second screw 3-04 is located in the second mounting slot 1-111. The second terminal slot 1-110 is used to accommodate the second wiring terminal 1-112, which can be a screw-type wiring terminal or a cage-type wiring terminal. In this way, the user can electrically connect the second wiring terminal 1-112 to the second screw 3-04 (using a soft wire or a wiring piece) as needed, and then connect the external circuit to the second wiring terminal 1-112.

[0068] In the case of setting the first terminal 1-109 and the second terminal 1-112, the first screw 3-01, the second screw 3-04, the first insert 3-02, and the second insert 3-05 act as a transfer structure, which can enrich the user's wiring methods.

[0069] For the leakage protection function, circuit board 4-00 is located within cavity 1-103. Zero-sequence transformer 2-00, as a component, is electrically connected to circuit board 4-00. Circuit board 4-00 determines whether leakage exists based on the sampled information. If so, it outputs an electrical signal, which is transmitted via auxiliary terminals. The circuitry (leakage protection circuit) by which circuit board 4-00 determines leakage based on the sampled information and outputs the electrical signal is well known in the art. The relevant circuit structure will not be detailed here, but the structure of the auxiliary terminals will be described in detail.

[0070] The auxiliary terminal includes an auxiliary insert 4-01 (the auxiliary insert 4-01 is also an insert nut) and an auxiliary screw 4-02. The auxiliary insert 4-01 is embedded in the cover 1-101. One end of the auxiliary insert 4-01 is exposed outside the shell and connected to the auxiliary screw 4-02, and the other end of the auxiliary insert 4-01 is exposed in the accommodating cavity 1-103. The circuit board 4-00 is electrically connected to the end of the auxiliary insert 4-01 exposed in the accommodating cavity 1-103. The electrical connection here is fastened with screws, that is, the screws are fastened to the insert. The screws not only have the effect of fastening the circuit board 4-00, but also have the effect of conductive connection (it has the effect of multiple uses, which can effectively reduce the number of parts and reduce the installation process). Of course, the circuit board 4-00 here can also be fixed independently in the accommodating cavity 1-103 by screws, or fixed in other ways, and then use leads to form an electrical connection with the insert.

[0071] With this structure, the circuit breaker's leakage protection circuit can be connected to the auxiliary screw 4-02, so that the electrical signal of the leakage protection circuit can be transmitted to the leakage release (circuit breaker), achieving the leakage tripping effect. This wiring structure undoubtedly also has a good sealing effect.

[0072] For the leakage protection function, there are two circuits, so the corresponding auxiliary inserts 4-01 and auxiliary screws 4-02 are both two.

[0073] For this auxiliary terminal, the auxiliary screw 4-02 is higher than the first screw 3-01 and the second screw 3-04 in the height direction of the zero-sequence transformer module. This facilitates the misalignment between the auxiliary line and the main line, facilitating user identification and wiring.

[0074] Similarly, along the length of the zero-sequence transformer module, the auxiliary screw 4-02 is located between the first screw 3-01 and the second screw 3-04, and the auxiliary screw 4-02 is placed close to the first screw 3-01. This design, with its staggered length, also facilitates user identification and wiring. Of course, the auxiliary screw 4-02 can also be placed closer to the second screw 3-04.

[0075] The housing 1-101 has auxiliary terminal slots 1-113, each of which is used to accommodate a set of auxiliary terminals. Specifically, one end of the auxiliary insert 4-01 is exposed at the bottom of the auxiliary terminal slot 1-113, and the auxiliary screw 4-02 is located within the auxiliary terminal slot 1-113. This design improves the creepage distance between the auxiliary terminals.

[0076] There are many ways to form the through-hole conductor 3-03. It can be a pure soft connection, a pure hard connection, or a combination of a soft connection and a hard connection.

[0077] like Figure 15-16 As shown, the through-hole conductor 3-03 is an integrally formed rigid busbar. The ends of the through-hole conductor 3-03 are secured to one end of the first insert 3-02 located within the accommodating cavity 1-103 and one end of the second insert 3-05 located within the accommodating cavity 1-103, respectively, via fasteners. Alternatively, the through-hole conductor 3-03 may not be integrally formed, but may be comprised of at least two independently formed rigid busbar sub-components secured together by rivets, bolts, or welding to form a rigid busbar assembly.

[0078] like Figure 18As shown, the through-conductor 3-03 is a flexible connection, and connecting plates are welded at both ends of the through-conductor 3-03. The two connecting plates are fixed to one end of the first insert 3-02 located in the accommodating cavity 1-103 and one end of the second insert 3-05 located in the accommodating cavity 1-103 through fasteners.

[0079] like Figure 17 As shown, the through-conductor 3-03 is a flexible connection, and the two ends of the through-conductor 3-03 are respectively welded and fixed to one end of the first insert 3-02 located in the accommodating cavity 1-103 and one end of the second insert 3-05 located in the accommodating cavity 1-103.

[0080] All the through-conductors 3-03 that penetrate into the zero-sequence transformer 2-00 can be separated from each other by using insulating tubes, adhesive wrapping, or even insulating spacers 5-100.

[0081] The following is an introduction using the 5-100 insulation partitions which are relatively easy to install.

[0082] This insulating spacer 5-100 includes a first bracket 5-101 and a second bracket 5-102.

[0083] The first bracket 5-101 is located on one side of the zero-sequence transformer 2-00 (on the side axially aligned with the center hole 2-01). The first bracket 5-101 has a first plug-in portion 5-103 that extends into the center hole 2-01 of the zero-sequence transformer 2-00. The second bracket 5-102 is located on the other side of the zero-sequence transformer 2-00 (on the other side axially aligned with the center hole 2-01). The second bracket 5-102 has a second plug-in portion 5-104 that extends into the center hole 2-01 of the zero-sequence transformer 2-00. The first plug-in portion 5-103 and the second plug-in portion 5-104 are plugged together to form a stable structure. Thus, when plugged together, the first bracket 5-101 and the second bracket 5-102 jointly separate all through-hole conductors 3-03, at least within the center hole 2-01 of the zero-sequence transformer 2-00.

[0084] The insulating spacer 5-100 of this assembly method has a very convenient conductor threading structure. Here, in order to reduce the number of production molds and reduce materials, the first bracket 5-101 and the second bracket 5-102 can be made into completely identical structures and can be plugged into each other.

[0085] The insulating spacer 5-100 has a conductor passing structure, and the number of the conductor passing structures is at least two. The conductor passing structures can be arranged in the following two ways.

[0086] The first type of conductor insertion structure is the assembly hole 5-105a. The assembly hole 5-105a is formed on the insulating spacer 5-100 and extends along a first direction F1. The first direction F1 is parallel to the axis of the center hole 2-01 of the zero-sequence transformer 2-00. The assembly hole 5-105a and the center hole 2-01 of the zero-sequence transformer 2-00 overlap. The assembly hole 5-105a is formed simultaneously on the first bracket 5-101 and the second bracket 5-102, so that the two brackets cooperate to form a complete assembly hole 5-105a.

[0087] This type of conductor insertion structure is suitable for the first type of through-hole conductor 3-03. Taking the rigid busbar structure as an example, the first type of through-hole conductor 3-03 comprises a first end 3-031, a through-hole portion 3-032a, and a second end 3-033. Both the first end 3-031 and the second end 3-033 are arranged perpendicular to the through-hole portion 3-032a. The first end 3-031 is screwed to the first insert 3-02, and the second end 3-033 is screwed to the second insert 3-05. The through-hole portion 3-032a passes through the center hole 2-01 of the zero-sequence transformer 2-00.

[0088] To facilitate installation of this type of conductor feedthrough structure with the insulating spacer 5-100, the shapes formed by the first end portion 3-031 and the feedthrough portion 3-032a, and the shapes formed by the second end portion 3-033 and the feedthrough portion 3-032a, as viewed from the first direction F1, overlap, forming a roughly L-shaped structure. The insulating spacer 5-100 includes an L-shaped mounting hole 5-105 (of which the assembly hole 5-105a is a portion). This L-shaped mounting hole 5-105 is also formed along the first direction F1, allowing this type of feedthrough conductor 3-03 to pass through it along the first direction F1 during installation.

[0089] The second type of conductor insertion structure is the assembly slot 5-106. The insulating spacer 5-100 here includes a main body (the first plug-in part 5-103 and the second plug-in part 5-104 are both part of the main body), and two side branches 5-107 are provided on both sides of the main body (the first bracket 5-101 and the second bracket 5-102 each have one). The two sides here refer to the second direction F2, that is, the direction perpendicular to the first direction F1. The two side branches 5-107 arranged on the same side of the main body are spaced apart in the first direction F1. The two side branches 5-107 arranged on the same side of the main body together with the main body form the assembly slot 5-106. A portion of the assembly slot 5-106 is located in the center hole 2-01 of the zero-sequence transformer 2-00. The assembly slot 5-106 formed in this way is open in the second direction F2.

[0090] This type of conductor insertion structure is suitable for the second-shaped through-hole conductor 3-03. Taking a rigid busbar as an example, the second-shaped through-hole conductor 3-03 includes a first end 3-031, a U-shaped insertion portion 3-032b, and a second end 3-033. The U-shaped insertion portion 3-032b consists of a middle portion 3-032b1 and two side portions 3-032b2. The middle portion 3-032b1 is used to pass through the center hole 2-01 of the zero-sequence transformer 2-00. The two side portions 3-032b2 are arranged perpendicular to the first end 3-031 and the second end 3-033, respectively. After the through-hole conductor 3-03 of this shape is assembled with the insulating spacer 5-100, the two side portions 3-032b2 are respectively located at the parts of the assembly groove 5-106 located on the two side branches 5-107, and the middle portion 3-032b1 is located at the part of the assembly groove 5-106 located on the main body. Generally speaking, the through-hole conductor 3-03 is arranged close to the groove wall of the assembly groove 5-106.

[0091] Of course, the above examples only illustrate the shape of the through-core conductor 3-03 and the corresponding conductor penetration structure, and the actual combination can be matched arbitrarily.

[0092] Taking the 4-pole zero-sequence transformer module as an example, it has two through-hole conductors 3-03 of the first shape and two through-hole conductors 3-03 of the second shape, and the corresponding number of assembly holes 5-105a and assembly slots 5-106 are both two.

[0093] Taking a 3-pole zero-sequence transformer module as an example, it can have two through-hole conductors 3-03 of the first shape and one through-hole conductor 3-03 of the second shape, corresponding to two mounting holes 5-105a and two mounting slots 5-106; it can also have two through-hole conductors 3-03 of the second shape and one through-hole conductor 3-03 of the first shape, corresponding to two mounting slots 5-106 and two mounting holes 5-105a. Of course, this 3-pole zero-sequence transformer module can also use the mounting bracket of a 4-pole zero-sequence transformer module, as long as one of the mounting holes 5-105a or one of the mounting slots 5-106 is not installed with a through-hole conductor 3-03.

[0094] Taking a 2-pole zero-sequence transformer module as an example, it can have two different conductor shapes and two different conductor insertion structures. It can also have only the first shape of the through-hole conductor 3-03 and the corresponding conductor insertion structure (mounting hole 5-105a method). It can also have only the second shape of the through-hole conductor 3-03 and the corresponding conductor insertion structure (mounting slot 5-106 method). Of course, this 3-pole zero-sequence transformer module can also use the mounting bracket of the 4-pole zero-sequence transformer module, as long as two of the mounting holes 5-105a and the mounting slot 5-106 are not installed with the through-hole conductor 3-03.

[0095] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate different embodiments or examples, and features of different embodiments or examples, described in this specification, unless otherwise inconsistent.

[0096] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A zero-sequence mutual inductor module, characterized in that: It includes a shell, a zero-sequence transformer and at least two groups of main line conductor assemblies; the main line conductor assembly includes a first screw, a first insert, a through-core conductor, a second screw and a second insert; the shell has a accommodating cavity, and the through-core conductor and the zero-sequence transformer are arranged in the accommodating cavity; the first insert and the second insert are both embedded in the shell, and one end of each is exposed on the outer surface of the shell and the other end is exposed in the accommodating cavity; the first screw is connected to the end of the first insert exposed in the shell, and the second screw is connected to the end of the second insert exposed in the shell for external wiring; the through-core conductor passes through the center hole of the zero-sequence transformer, and the two ends of the through-core conductor are electrically connected to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity respectively.

2. A zero-sequence mutual inductor module according to claim 1, characterized in that: The housing is provided with a first terminal slot and a first mounting slot, the first mounting slot is communicated with the first terminal slot, the first screw is located in the first mounting slot, and the first terminal slot is used to accommodate the first wiring terminal; And / or, a second terminal slot and a second mounting slot are provided on the housing, the second mounting slot is communicated with the second terminal slot, the second screw is located in the second mounting slot, and the second terminal slot is used to place the second wiring terminal.

3. A zero-sequence mutual inductor module according to claim 1, characterized in that: It also includes a circuit board and an auxiliary terminal; the auxiliary terminal includes an auxiliary insert and an auxiliary screw; the auxiliary insert is embedded in the shell, one end of the auxiliary insert is exposed outside the shell and connected to the auxiliary screw, and the other end of the auxiliary insert is exposed in the accommodating cavity; the circuit board is located in the accommodating cavity and is electrically connected to the end of the auxiliary insert exposed in the accommodating cavity.

4. A zero-sequence mutual inductor module according to claim 3, characterized in that: In the height direction, the auxiliary screws are higher than the first screws and the second screws; And / or, in the length direction, the auxiliary screw is located between the first screw and the second screw, and the auxiliary screw is arranged close to the first screw or close to the second screw; And / or, an auxiliary terminal slot is opened on the housing, one end of the auxiliary insert is exposed at the bottom of the auxiliary terminal slot, and the auxiliary screw is located in the auxiliary terminal slot.

5. A zero-sequence mutual inductor module according to claim 1, characterized in that: The through-conductor is a flexible connection, and both ends of the through-conductor are respectively welded to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity; Alternatively, the through-conductor is a flexible connection, and connecting pieces are welded at both ends of the through-conductor, and the two connecting pieces are fixed to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity respectively through fasteners; Alternatively, the through-conductor is an integrally formed hard busbar, and both ends of the through-conductor are fixed to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity by fasteners respectively; Alternatively, the through-hole conductor is a hard busbar assembly, and the two ends of the through-hole conductor are fixed to one end of the first insert located in the accommodating cavity and one end of the second insert located in the accommodating cavity by fasteners respectively. The hard busbar assembly is formed by at least two independently formed hard busbar sub-components fixed by rivets, bolts or welding.

6. A zero-sequence mutual inductor module according to claim 1, characterized in that: At least the portion of all through-conductors in the center hole of the zero-sequence transformer is separated by sheathing with insulating tubes or wrapping with glue.

7. The zero-sequence mutual inductor module according to claim 1, characterized in that: It also includes an insulating spacer, which cooperates with the zero-sequence transformer and is used to separate all the through-conductors at least in the center hole of the zero-sequence transformer.

8. A zero-sequence mutual inductor module according to claim 7, characterized in that: The insulating spacer includes a first bracket and a second bracket; the first bracket is located on one side of the zero-sequence transformer, and the first bracket has a first plug-in portion extending into the center hole of the zero-sequence transformer; the second bracket is located on the other side of the zero-sequence transformer, and the second bracket has a second plug-in portion extending into the center hole of the zero-sequence transformer; the first plug-in portion and the second plug-in portion are plugged into each other, and after plugging in, the first bracket and the second bracket jointly separate all the through-conductors at least in the center hole of the zero-sequence transformer.

9. The zero-sequence mutual inductor module according to claim 7, characterized in that: The insulating spacer includes at least two sets of conductor penetration structures, and all conductor penetration structures adopt any one or a combination of the following two structures: Structure 1: The insulating spacer is provided with an assembly hole, which is opened along a first direction, the first direction is parallel to the axis direction of the center hole of the zero-sequence transformer, the assembly hole and the center hole of the zero-sequence transformer have an overlapping portion, and each assembly hole is for a through-hole conductor to pass through; Structure 2: The insulating spacer includes a main body, and two side branches are arranged on one side of the main body. The two side branches arranged on the same side of the main body are spaced apart in a first direction, and the first direction is parallel to the axial direction of the center hole of the zero-sequence transformer. The two side branches arranged on the same side of the main body and the main body jointly form an assembly groove, and a part of the assembly groove is in the center hole of the zero-sequence transformer. Each assembly groove is provided with a through-core conductor, and the through-core conductor is arranged close to the groove wall of the assembly groove.

10. The zero-sequence mutual inductor module according to claim 1, characterized in that: The housing includes a cover shell and a sealing plate. The accommodating cavity is in the cover shell. The bottom surface of the cover shell has a mounting opening. The opening of the accommodating cavity is connected to the mounting opening. The sealing plate is embedded in the mounting opening to seal the opening of the accommodating cavity. The cover shell and the sealing plate are fastened by screws or riveted. And / or, the housing includes a cover shell and a sealing plate, the accommodating cavity is in the cover shell, the bottom surface of the cover shell has a mounting opening, the accommodating cavity opening is communicated with the mounting opening, the sealing plate is at least partially embedded in the mounting opening to close the accommodating cavity opening, the cover shell is provided with a first annular portion surrounding the outside of the accommodating cavity opening, the sealing plate has a second annular portion, and the first annular portion and the second annular portion are staggered; And / or, the shell includes a cover shell and a sealing plate, the accommodating cavity is in the cover shell, the bottom surface of the cover shell has a mounting port, the accommodating cavity opening is connected to the mounting port, the sealing plate is at least partially embedded in the mounting port to close the accommodating cavity opening, and a glue filling structure is provided between the cover shell and the sealing plate, and the glue filling structure surrounds the accommodating cavity opening.

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