A current transformer module with phase-to-phase insulation structure

Abstract

This utility model discloses a current transformer module with a phase-to-phase insulation structure, installed on the load side of a circuit breaker. The module includes a housing, a zero-sequence current transformer, current-carrying components, and terminals. The improvement lies in the inclusion of an integrally formed insulating isolation frame within the housing's accommodating groove, on which the zero-sequence current transformer is mounted. The isolation frame includes an isolation main beam and first and second partitions on either side. Through an L-shaped combination of horizontal and vertical plates, four independent isolation slots are formed on both sides of the main beam, respectively accommodating the A, B, C, and N phase current-carrying plates. This utility model, through its rigid isolation structure, effectively ensures the electrical clearance and creepage distance between the phase current-carrying plates, eliminating the risk of phase-to-phase short circuits caused by conductor contact, and improving the module's insulation reliability and safety.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically to a current transformer module with a phase-to-phase insulation structure. Background Technology

[0002] A residual current circuit breaker (RCCB) is an electrical protection device widely used in low-voltage power distribution systems. It primarily detects leakage current in the circuit and quickly cuts off the power supply in the event of a leakage fault, preventing electric shock and electrical fires. As the safety and reliability requirements of power systems continue to increase, the structural design of RCCBs is constantly being optimized, especially the installation method of its core component—the zero-sequence current transformer—which directly affects the circuit breaker's detection accuracy, insulation performance, and service life.

[0003] In traditional residual current circuit breaker (RCCB) designs, instrument transformer modules typically employ a "backpack-style" installation method. This type of module generally includes a housing, a zero-sequence current transformer, current-carrying components, and terminals. The current-carrying components usually consist of several flexible conductors that pass through the central hole of the zero-sequence current transformer, connecting one end to the output terminal of the circuit breaker module and the other end to external terminals for current transmission and leakage signal detection. As can be seen from this structure, in traditional backpack-style instrument transformer modules, the four current-carrying conductors (A, B, C, and N) are often arranged side-by-side in the same space, relying solely on air or simple insulating bushings for isolation. This lack of effective physical separation makes it difficult to strictly control the straight-line and surface distances between adjacent phase conductors within safety standards. Electrical clearances and creepage distances are difficult to guarantee, and conductors are prone to contact due to compression, bending, or vibration, causing phase-to-phase short circuits or insulation damage. In severe cases, this can lead to arcing faults, affecting the safe operation of the equipment. Utility Model Content

[0004] The purpose of this utility model is to overcome the problem that in the prior art, the four current-carrying conductors A, B, C, and N of the current transformer module are often arranged side by side in the same space. It is difficult to guarantee the electrical clearance and creepage distance by relying solely on air or simple insulating bushings for isolation. The conductors are also prone to contact with each other due to compression, bending, or vibration, which can cause phase-to-phase short circuits or insulation damage and affect the safe operation of the equipment.

[0005] To address the aforementioned problems, this utility model provides a current transformer module with a phase-to-phase insulation structure, installed on the load side of a circuit breaker. It includes a housing, a zero-sequence current transformer, current-carrying components, and terminals. The housing includes a wiring boss with multiple terminals and a receiving groove formed between the wiring boss and the load side. It also includes an isolation frame mounted in the receiving groove of the housing. The zero-sequence current transformer is fitted onto the isolation frame. The current-carrying component includes four-phase current-carrying plates (A, B, C, and N) that pass through the zero-sequence current transformer and connect to the load side and the terminals respectively. The isolation frame includes an isolation main beam extending axially along the zero-sequence current transformer between the wiring boss and the load side, and two sets of partitions on both sides of the isolation main beam to isolate the four-phase current-carrying plates (A, B, C, and N) from each other. The two sets of partitions are connected to the isolation main beam to form four independent isolation slot areas suitable for accommodating the A-phase, B-phase, C-phase, and N-phase current-carrying plates.

[0006] As a preferred embodiment, the two sets of partitions include a first partition and a second partition respectively disposed on both sides of the isolation main beam. The first partition is formed on a first side of the isolation main beam, and the second partition is formed on a second side of the isolation main beam. The first side and the second side are arranged back to back. The first partition is connected to the first side to form two isolation groove areas located on one side of the isolation main beam and separated vertically. The second partition is connected to the second side to form two isolation groove areas located on the other side of the isolation main beam and separated vertically.

[0007] As a preferred embodiment, the first partition includes a left horizontal plate extending along the length of the main partition beam and disposed on a first side of the main partition beam, and a left vertical plate extending along the height direction of the main partition beam and connecting the left horizontal plate, wherein the left vertical plate is disposed at the end where the left horizontal plate and the partition beam are connected.

[0008] As a preferred embodiment, the left horizontal plate, the left vertical plate, and the first side are arranged perpendicularly and orthogonally in pairs, and are connected by the left horizontal plate, the left vertical plate, and the first side to form two isolation groove areas separated by the upper and lower sides on one side of the isolation main beam. The A-phase current-carrying plate and the B-phase current-carrying plate are bent and extended to fit and accommodate in the two isolation groove areas.

[0009] As a preferred embodiment, a first horizontal strip is formed between the left vertical plate and the left horizontal plate. The end of the left vertical plate is connected to the first horizontal strip to form a first vertical strip. The first vertical strip is perpendicular to the first horizontal strip. The first horizontal strip is connected to the bottom edge of the left vertical plate and is connected to the left horizontal plate in an L-shaped structure.

[0010] As a preferred embodiment, the second partition includes a right horizontal plate extending along the length of the main isolation beam and disposed on the second side of the main isolation beam, and a right vertical plate extending along the height direction of the main isolation beam and connecting the right horizontal plate, wherein the right vertical plate is disposed at the end where the right horizontal plate and the partition beam are connected.

[0011] As a preferred embodiment, the right horizontal plate, the right vertical plate, and the second side are respectively arranged perpendicularly and orthogonally in pairs, and the right horizontal plate, the right vertical plate, and the second side are connected to form two isolation groove areas separated by the upper and lower sides on one side of the isolation main beam. The C-phase current-carrying plate and the N-phase current-carrying plate are respectively bent and extended to be adapted and accommodated in the two isolation groove areas.

[0012] As a preferred embodiment, a straight second horizontal strip is formed between the right vertical plate and the right horizontal plate. The end of the right vertical plate connects to the second horizontal strip to form a longitudinal second vertical strip. The second vertical strip is perpendicular to the second horizontal strip. The second horizontal strip connects to the bottom edge of the right vertical plate and is connected to the right horizontal plate in an L-shaped structure.

[0013] As a preferred embodiment, a positioning connection structure is provided between the wiring boss and the isolation frame to form a positioning fit. The wiring boss is provided with two isolation strips that extend and connect the two sets of partitions. The two isolation strips and the two sets of partitions cooperate to form two isolation channels between the isolation main beam and the wiring boss for accommodating and isolating two adjacent phase current-carrying plates. The two isolation channels are respectively connected to two terminal compartments on the wiring boss.

[0014] As a preferred embodiment, the positioning structure includes: A positioning slot is provided on the wiring boss, and one end of the isolation main beam is inserted into the positioning slot. The first positioning part includes a set of plug-in plates disposed on both sides of the positioning slot, and a set of plug-in slots disposed between the two partitions and the two sides of the isolation main beam. The set of plug-in plates are horizontally inserted into the set of plug-in slots to form a positioning fit, and the isolation strip extends and connects to the side of the plug-in plates. The second positioning part includes a set of positioning bosses that are perpendicularly connected to a set of plug-in plates, and a set of stepped grooves that are correspondingly arranged on both sides of the main beam. The positioning bosses and the stepped grooves are matched and connected to form a positioning fit. This set of stepped grooves is perpendicularly connected to the opening of a set of plug-in slots. This set of positioning bosses is formed on both sides of the inner end of the positioning slot.

[0015] Compared with the prior art, the technical solution of this utility model has the following advantages: 1. In the current transformer module provided by this utility model, the isolation frame, through the combination of the isolation main beam and its double-sided partitions, forms four independent isolation slot areas that completely physically isolate the four phase current-carrying plates of A, B, C, and N. The isolation frame, as an independent structural component, is directly mounted in the housing slot. The connection boss between the isolation main beam and the load end enhances the overall structural rigidity, thereby providing a rigid support foundation for the phase-to-phase physical separation of the current-carrying plates and the positioning of the zero-sequence current transformer, effectively resisting external mechanical stress. Each phase current-carrying plate can be pre-bent into a shape suitable for the isolation slot area, and after installation, it is not easily deformed by vibration or compression. The shifting mechanism, which maintains a consistent phase-to-phase distance, offers several advantages. The sidewalls of the isolation zone are constructed with insulating partitions and main isolation beams, confining each phase's rigid current-carrying plate within an independent zone formed by the insulating isolation frame. These plates are separated from each other by robust plastic barriers, ensuring stable and sufficient electrical clearance and creepage distance between phases. The entire module is compact, rigid, and has a simple and reliable assembly process. It solves the insulation risks associated with messy wiring in traditional backpack-style instrument transformer modules, enhances phase-to-phase insulation performance, and significantly improves the safety and reliability of the residual current circuit breaker. This, in turn, extends the equipment's lifespan. 2. In the current transformer module provided by this utility model, the first and second partitions are respectively formed on both sides of the isolation main beam. The first and second partitions of the isolation frame, through the combination structure design of horizontal and vertical plates, together with the isolation main beam, form four independent isolation slot areas. The four isolation slot areas are clearly divided into four distinct positions: upper left, lower left, upper right, and lower right. This provides extremely clear and unique guidance and positioning for the insertion of the four-phase current-carrying plates A, B, C, and N, thereby completely separating the four-phase current-carrying plates A, B, C, and N in their respective spaces, accurately controlling the creepage distance and electrical clearance, and achieving electrical isolation. The isolation frame using this technical solution, within the limited housing accommodating slot, through the layered and side-separated structural layout, not only meets the four-phase isolation requirements but also avoids structural redundancy, adapting to the design trend of miniaturized circuit breakers.

[0016] 3. In the current transformer module provided by this utility model, the design forms two isolation channels that directly reach the terminal compartment through the cooperation of the isolation strip and the partition. The purpose of this design is to extend the isolation function inside the isolation frame continuously and seamlessly from the current transformer area to the terminal area, realizing the full-path isolation of the current-carrying plate from the load end to the terminal. This ensures that the current-carrying plates of adjacent phases have stable and sufficient electrical clearance and creepage distance along the entire path from the cover to the terminal, thereby eliminating the risk of phase-to-phase short circuit and creepage breakdown caused by insufficient spacing of the current-carrying plates near the terminal. This is beneficial for achieving phase-to-phase isolation of the current-carrying plate along the entire path and enhancing electrical safety.

[0017] 4. In the current transformer module provided by this utility model, this positioning structure achieves the positioning connection between the isolation frame and the wiring boss through the triple positioning cooperation of the positioning slot, the first positioning part, and the second positioning part. The positioning slot provides a guiding installation function for the isolation main beam, guiding the isolation frame to be inserted along the correct path and ensuring that the isolation frame is installed along the preset axis. The first positioning part ensures the alignment accuracy of the partition part and the isolation strip through the horizontal positioning cooperation of the plug plate and the plug groove, so as to limit the vertical displacement of the isolation frame. The second positioning part limits the horizontal displacement of the isolation frame through the vertical positioning cooperation of the positioning boss and the stepped groove, and avoids the isolation frame being installed too deep or too shallow. The isolation frame of this technical solution adopts the above-mentioned positioning structure design, and the isolation frame and the wiring boss form a rigid whole through multiple positioning cooperation, reducing the possibility of loosening and deformation of the isolation frame and ensuring the structural stability during long-term use. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the planar structure of the current transformer module of this utility model; Figure 2 This is a three-dimensional structural diagram of the current transformer module of this utility model; Figure 3 This is a schematic diagram of the installation structure of the isolation frame of this utility model; Figure 4 This is a schematic diagram of the separate structure of the isolation frame and the cover of this utility model; Figure 5 This is a schematic diagram of the structure of the isolation frame of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Cover; 11. Receiving slot; 2. Zero-sequence current transformer; 3. Current-carrying plate; 4. Wiring boss; 41. Terminal compartment; 5. Isolation frame; 51. Isolation main beam; 52. First partition; 521. Left horizontal plate; 522. Left vertical plate; 523. First horizontal strip edge; 524. First vertical strip edge; 53. Second partition; 531. Right horizontal plate; 532. Right vertical plate; 533. Second horizontal strip edge; 534. Second vertical strip edge; 6. Isolation strip; 7. Isolation channel; 81. Positioning slot; 82. Plug-in plate; 83. Plug-in groove; 84. Positioning boss; 85. Step groove; 9. Circuit breaker. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example This utility model provides, for example Figure 1-5 The diagram shows a current transformer module with phase-to-phase insulation, installed on the load side of a circuit breaker 9. It includes a housing 1, a zero-sequence current transformer 2, current-carrying components, and terminals. The housing 1 includes a wiring boss 4 with multiple terminals mounted thereon and a receiving groove 11 formed inside the wiring boss 4 between the wiring boss 4 and the load side. It also includes an isolation frame 5 mounted in the receiving groove 11 of the housing 1. The zero-sequence current transformer 2 is sleeved on the isolation frame 5. The current-carrying components include four-phase current-carrying plates 3 (A, B, C, N) that pass through the zero-sequence current transformer and connect to the load side and the terminals respectively. The load end of the circuit breaker 9 is provided with multiple conductive plates for connecting multiple current-carrying plates 3. The conductive plates are fixed to the current-carrying plates 3 by screws. The isolation frame 5 includes an isolation main beam 51 extending along the axial direction of the zero-sequence current transformer 2 and disposed between the wiring boss 4 and the load end, and two sets of partitions disposed on both sides of the isolation main beam 51 for isolating the four-phase current-carrying plates 3 of phases A, B, C, and N from each other. The two sets of partitions are connected to the isolation main beam 51 to form four independent isolation slot areas suitable for accommodating the phase A current-carrying plate, phase B current-carrying plate, phase C current-carrying plate, and phase N current-carrying plate.

[0025] In the above embodiment, the isolation frame 5, through the combination of the isolation main beam 51 and its double-sided partitions, forms four independent isolation slot areas that completely physically isolate the four-phase current-carrying plates 3 (A, B, C, and N). The isolation frame 5 is directly mounted in the housing slot 11 of the casing 1 as an independent structural component. The connection of the wiring boss 4 to the load end through the isolation main beam 51 enhances the overall structural rigidity, thereby providing a rigid support foundation for the phase-to-phase physical separation of the current-carrying plates 3 and the positioning of the zero-sequence current transformer 2, effectively resisting external mechanical stress. Each phase current-carrying plate 3 can be pre-bent into a shape that fits the isolation slot area, and after installation, it is not easily deformed or displaced due to vibration or compression. Maintaining a consistent phase-to-phase distance is advantageous because the sidewalls of the isolation zone are composed of insulating material partitions and isolation main beams 51. This confines the rigid current-carrying plates of each phase within an independent zone formed by the insulating isolation frame, separating them from each other with solid plastic barriers. This ensures stable and sufficient electrical clearance and creepage distance between each phase. The entire module has a compact structure, good rigidity, and a simple and reliable assembly process. It solves the insulation risks caused by the messy wiring arrangement of traditional backpack-type instrument transformer modules, enhances phase-to-phase insulation performance, significantly improves the safety and reliability of the residual current circuit breaker 9, and thus extends the equipment life.

[0026] The specific configuration of the isolation frame will be described in detail below with reference to points 2-5: The two sets of partitions include a first partition 52 and a second partition 53 respectively disposed on both sides of the isolation main beam 51. The first partition 52 is formed on the first side of the isolation main beam 51, and the second partition 53 is formed on the second side of the isolation main beam 51. The first side and the second side are arranged back to back. The first partition 52 is connected to the first side to form two isolation groove areas that are separated vertically on one side of the isolation main beam 51. The second partition 53 is connected to the second side to form two isolation groove areas that are separated vertically on the other side of the isolation main beam 51. The first partition 52 and the second partition 53 of this isolation frame 5, through the combined structure design of horizontal and vertical plates, together with the isolation main beam 51, form four independent isolation slot areas. The four isolation slot areas are clearly divided into four distinct positions: upper left, lower left, upper right, and lower right. This provides extremely clear and unique guidance and positioning for the insertion of the four-phase current-carrying plates A, B, C, and N, thereby completely separating the four-phase current-carrying plates A, B, C, and N in their respective spaces, accurately controlling the creepage distance and electrical clearance, and achieving electrical isolation. The isolation frame 5 using this technical solution, within the limited housing accommodating slot, through a layered and side-by-side structural layout, not only meets the four-phase isolation requirements but also avoids structural redundancy, adapting to the design trend of miniaturized circuit breakers.

[0027] like Figure 5As shown, the first partition 52 includes a left horizontal plate 521 extending along the length of the isolation main beam 51 and disposed on the first side of the isolation main beam 51, and a left vertical plate 522 extending along the height direction of the isolation main beam 51 and connected to the left horizontal plate 521. The left vertical plate 522 is disposed at the end where the left horizontal plate 521 is connected to the partition main beam. A straight first horizontal strip 523 is formed between the left vertical plate 522 and the left horizontal plate 521. The end of the left vertical plate 522 is connected to the first horizontal strip 523 to form a longitudinal first vertical strip 524. The first vertical strip 524 is perpendicular to the first horizontal strip 523. The first horizontal strip 523 is connected to the bottom edge of the left vertical plate 522 and connected to the left horizontal plate 521 in an L-shaped structure. The creepage distance at the edge of the left vertical plate 522 is increased by the first horizontal strip 523 and the first vertical strip 524 to ensure a safe electrical distance between the A and B phase current-carrying plates. The left horizontal plate 521, left vertical plate 522, and first side are arranged perpendicularly and orthogonally in pairs. The perpendicular and orthogonal design of the three forms a robust rigid frame, which can effectively resist the deformation stress caused by the installation of the current-carrying plate or external vibration, ensure the shape of the isolation groove area is stable for a long time, prevent the current-carrying plate 3 from shifting, and ensure that the shape of the groove area is precisely adapted to the bent extension of the current-carrying plate 3. In this structural setting, the left horizontal plate 521, left vertical plate 522 and the first side of the isolation main beam 51 are connected to form two isolation groove areas separated by the upper and lower sides on one side of the isolation main beam. The A-phase current-carrying plate and the B-phase current-carrying plate are respectively bent and extended to fit into the two isolation groove areas. This design completely physically separates the A-phase and B-phase current-carrying plates, ensuring that the phase-to-phase electrical clearance and creepage distance meet the safety standards, and fundamentally eliminates phase-to-phase short circuits or arcing faults caused by current-carrying plate contact.

[0028] like Figure 4As shown, the second partition 53 includes a right horizontal plate 531 extending along the length of the isolation main beam 51 and disposed on the second side of the isolation main beam 51, and a right vertical plate 532 extending along the height direction of the isolation main beam 51 and connected to the right horizontal plate 531. The right vertical plate 532 is disposed at one end where the right horizontal plate 531 is connected to the partition main beam. A straight second horizontal strip 533 is formed between the right vertical plate 532 and the right horizontal plate 531. The end of the right vertical plate 532 is connected to the second horizontal strip 533 to form a longitudinal second vertical strip 534. The second vertical strip 534 is perpendicular to the second horizontal strip. The second horizontal strip 533 is connected to the bottom edge of the right vertical plate 532 and connected to the right horizontal plate 531 in an L-shaped structure. The creepage distance at the edge of the left vertical plate 522 is increased by the first horizontal strip 523 and the first vertical strip 524 to ensure a safe electrical distance between the C and N phase current-carrying plates 3. In a further preferred configuration, the right horizontal plate 531, the right vertical plate 532, and the second side are respectively arranged perpendicularly and orthogonally in pairs, and are connected by the right horizontal plate 531, the right vertical plate 532, and the second side of the isolation main beam 51 to form two isolation groove areas separated vertically on the other side of the isolation main beam. The C-phase current-carrying plate and the N-phase current-carrying plate are respectively bent and extended to adapt and accommodate in the two isolation groove areas. This design completely physically separates the C-phase and N-phase current-carrying plates, ensuring that the phase-to-phase electrical clearance and creepage distance meet safety standards and avoiding phase-to-phase short circuit accidents.

[0029] In this embodiment, when the current-carrying plates 3 of each phase are installed and fixed, they will support the isolation frame 5 erected in the receiving groove 11. In order to ensure the stability and reliability of the installation position of the isolation frame 5, refer to Figure 3-5As shown, a positioning connection structure is provided between the wiring boss 4 and the isolation frame 5 to form a positioning fit. The wiring boss 4 is provided with two isolation strips 6 that extend to connect the two sets of partitions. The two isolation strips 6 and the two sets of partitions cooperate to form two isolation channels 7 between the isolation main beam 51 and the wiring boss 4 for accommodating and isolating two adjacent phase current-carrying plates. The two isolation channels 7 are respectively connected to two terminal compartments 41 provided on the wiring boss 4. These two isolation channels 7 can meet the installation requirements of two current-carrying plates 3 passing through the two isolation slots on the upper side of the isolation frame 5, and the two current-carrying plates passing through the two isolation slots on the lower side of the isolation frame 5 pass through the bottom side of the two isolation channels 7, without interfering with each other and forming upper and lower insulation isolation. This design, through the cooperation of the isolation strip 6 and the partition, forms two isolation channels 7 that directly reach the terminal compartment 41. The purpose of this design is to extend the isolation function inside the isolation frame 5 continuously and seamlessly from the transformer area to the terminal area, realizing full-path isolation of the current-carrying plates from the load end to the terminal. This ensures that there is a stable and sufficient electrical clearance and creepage distance between the current-carrying plates of adjacent phases throughout the entire path from the cover 1 to the terminal, thereby eliminating the risk of phase-to-phase short circuits and creepage breakdowns caused by insufficient spacing of the current-carrying plates 3 near the terminal. This is beneficial for achieving full-path phase-to-phase isolation of the current-carrying plates and enhancing electrical safety.

[0030] Further optimized settings, such as Figure 3As shown, the positioning structure includes a positioning slot 81, a first positioning part, and a second positioning part. The specific arrangement is as follows: The positioning slot 81 is located on the wiring boss 4. One end of the isolation main beam 51 is inserted into the positioning slot 81. The positioning slot 81 provides a guiding installation function for the isolation main beam 51, guiding the isolation frame 5 to be inserted along the correct path, ensuring that the isolation frame 5 is installed along a preset axis. The first positioning part includes a set of plug-in plates 82 respectively disposed on both sides of the positioning slot 81, and a set of plug-in slots 83 disposed between the two partitions and the two sides of the isolation main beam 51. The set of plug-in plates 82 are horizontally inserted into the set of plug-in slots 83 to form a positioning fit. The isolation strip 6 extends and connects to the side of the plug-in plates 82. The first positioning part uses the horizontal positioning cooperation of the plug-in plate 82 and the plug-in groove 83 to ensure the alignment accuracy of the partition part and the isolation strip 6, so as to limit the vertical displacement of the isolation frame 5. The second positioning part includes a set of positioning bosses 84 vertically connected to a set of plug-in plates 82, and a set of stepped grooves 85 correspondingly arranged on both sides of the main beam. The positioning bosses 84 and the stepped grooves 85 are matched and connected to form a positioning cooperation. This set of stepped grooves 85 is vertically connected to the opening of a set of plug-in grooves 83. This set of positioning bosses 84 is formed on both sides of the inner end of the positioning slot 81. The second positioning part uses the vertical positioning cooperation of the positioning bosses 84 and the stepped grooves 85 to limit the horizontal displacement of the isolation frame 5 and to prevent the isolation frame 5 from being installed too deep or too shallow. This positioning structure achieves the positioning connection between the isolation frame 5 and the wiring boss 4 through the triple positioning cooperation of the positioning slot, the first positioning part, and the second positioning part. The multiple positioning cooperation makes the isolation frame 5 and the wiring boss 4 form a rigid whole, reducing the possibility of the isolation frame loosening or deformation, ensuring the structural stability during long-term use, and using high-precision positioning cooperation to ensure that the partition part of the isolation frame and the isolation strip of the wiring boss are always in the preset position, reliably maintaining electrical clearance and creepage distance, and greatly reducing the assembly difficulty and improving the efficiency of mass production.

[0031] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A current transformer module with phase-to-phase insulation structure, installed on the load side of a circuit breaker (9), comprising a housing (1), a zero-sequence current transformer (2), a current-carrying component, and terminals, wherein the housing (1) includes a wiring boss (4) on which multiple terminals are mounted and a receiving groove (11) formed between the inner side of the wiring boss (4) and the load side, characterized in that, It also includes an isolation frame (5) installed in the receiving groove (11) of the housing (1). The zero-sequence transformer (2) is sleeved on the isolation frame (5). The current-carrying component includes four-phase current-carrying plates (3) of A, B, C, and N that pass through the zero-sequence transformer and are respectively connected to the load end and the terminal block. The isolation frame (5) includes an isolation main beam (51) extending along the axial direction of the zero-sequence transformer (2) and disposed between the terminal block (4) and the load end, and two sets of partitions disposed on both sides of the isolation main beam (51) to isolate the four-phase current-carrying plates (3) of A, B, C, and N from each other. The two sets of partitions are connected to the isolation main beam (51) to form four independent isolation groove areas suitable for accommodating the four-phase current-carrying plates (3) of A, B, C, and N.

2. The current transformer module with phase-to-phase insulation structure according to claim 1, characterized in that: The two sets of partitions include a first partition (52) and a second partition (53) respectively disposed on both sides of the isolation main beam (51). The first partition (52) is formed on the first side of the isolation main beam (51), and the second partition (53) is formed on the second side of the isolation main beam (51). The first side and the second side are arranged back to back. The first partition (52) is connected to the first side to form two isolation groove areas that are separated vertically on one side of the isolation main beam (51). The second partition (53) is connected to the second side to form two isolation groove areas that are separated vertically on the other side of the isolation main beam (51).

3. The current transformer module with phase-to-phase insulation structure according to claim 2, characterized in that: The first partition (52) includes a left horizontal plate (521) extending along the length of the partition main beam (51) and disposed on a first side of the partition main beam (51), and a left vertical plate (522) extending along the height direction of the partition main beam (51) and connected to the left horizontal plate (521). The left vertical plate (522) is disposed at the end where the left horizontal plate (521) and the partition main beam are connected.

4. The current transformer module with phase-to-phase insulation structure according to claim 3, characterized in that: The left horizontal plate (521), the left vertical plate (522) and the first side are respectively arranged perpendicularly and orthogonally in pairs, and are connected by the left horizontal plate (521), the left vertical plate (522) and the first side to form two isolation groove areas separated by the upper and lower sides on one side of the isolation main beam (51), so that the A phase current-carrying plate and the B phase current-carrying plate are respectively bent and extended to adapt and accommodate in the two isolation groove areas.

5. The current transformer module with phase-to-phase insulation structure according to claim 4, characterized in that: A straight first horizontal strip (523) is formed between the left vertical plate (522) and the left horizontal plate (521). The end of the left vertical plate (522) is connected to the first horizontal strip (523) to form a longitudinal first vertical strip (524). The first vertical strip (524) is perpendicular to the first horizontal strip (523). The first horizontal strip (523) is connected to the bottom edge of the left vertical plate (522) and connected to the left horizontal plate (521) in an L-shaped structure.

6. The current transformer module with phase-to-phase insulation structure according to claim 2, characterized in that: The second partition (53) includes a right horizontal plate (531) extending along the length of the isolation main beam (51) and disposed on the second side of the isolation main beam (51), and a right vertical plate (532) extending along the height direction of the isolation main beam (51) and connecting the right horizontal plate (531), wherein the right vertical plate (532) is disposed at the end where the right horizontal plate (531) and the partition main beam are connected.

7. The current transformer module with phase-to-phase insulation structure according to claim 6, characterized in that: The right horizontal plate (531), the right vertical plate (532), and the second side are respectively arranged perpendicularly and orthogonally to each other, and are connected by the right horizontal plate (531), the right vertical plate (532), and the second side to form two isolation groove areas separated by the upper and lower sides on one side of the isolation main beam (51), so that the C-phase current-carrying plate and the N-phase current-carrying plate are respectively bent and extended to adapt and accommodate in the two isolation groove areas.

8. The current transformer module with phase-to-phase insulation structure according to claim 7, characterized in that: A straight second horizontal strip (533) is formed between the right vertical plate (532) and the right horizontal plate (531). The end of the right vertical plate (532) is connected to the second horizontal strip (533) to form a longitudinal second vertical strip (534). The second vertical strip (534) is perpendicular to the second horizontal strip. The second horizontal strip (533) is connected to the bottom edge of the right vertical plate (532) and connected to the right horizontal plate (531) in an L-shaped structure.

9. The current transformer module with phase-to-phase insulation structure according to any one of claims 1-8, characterized in that: A positioning connection structure is provided between the wiring boss (4) and the isolation frame (5) to form a positioning fit. The wiring boss (4) is provided with two isolation strips (6) that extend to connect the two sets of partitions. The two isolation strips (6) and the two sets of partitions cooperate to form two isolation channels (7) between the isolation main beam (51) and the wiring boss (4) for accommodating and isolating the two adjacent phase current-carrying plates (3). The two isolation channels (7) are respectively connected to two terminal compartments (41) provided on the wiring boss (4).

10. The current transformer module with phase-to-phase insulation structure according to claim 9, characterized in that: The positioning connection structure includes: A positioning slot (81) is provided on the wiring boss (4), and one end of the isolation main beam (51) is inserted into the positioning slot (81); The first positioning part includes a set of plug-in plates (82) respectively disposed on both sides of the positioning slot (81), and a set of plug-in grooves (83) disposed between the two partitions and the two sides of the isolation main beam (51). The set of plug-in plates (82) are horizontally inserted into the set of plug-in grooves (83) to form a positioning fit. The isolation strip (6) extends and connects to the side of the plug-in plate (82). The second positioning part includes a set of positioning bosses (84) that are perpendicularly connected to a set of plug-in plates (82), and a set of stepped grooves (85) that are correspondingly arranged on both sides of the main beam. The positioning bosses (84) and the stepped grooves (85) are matched and connected to form a positioning fit. The set of stepped grooves (85) is perpendicularly connected to the opening of a set of plug-in grooves (83). The set of positioning bosses (84) are formed on both sides of the inner end of the positioning slot (81).

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