Residual current protection accessories

Abstract

This application provides a leakage current protection accessory, relating to the field of low-voltage electrical technology. The leakage current protection accessory is applied to a switch assembly. The accessory includes a mounting housing, a zero-sequence current transformer, and a conductive structure. The mounting housing has a mounting groove. The zero-sequence current transformer has a through hole, the dimension of which along a first direction is larger than its dimension along a second direction. The conductive structure passes through the through hole, and one end of the conductive structure is electrically connected to the switch body of the switch assembly. Along the first direction, the dimension of the mounting groove is larger than the dimension of the through hole. The conductive structure includes at least two conductive elements, the first direction being the arrangement direction of the at least two conductive elements, and the second direction being perpendicular to both the first and second directions and the direction in which the conductive structure passes through the through hole. According to the leakage current protection accessory provided in this application, the distance between different conductive elements can be increased, reducing the possibility of short circuits between different conductive elements and ensuring the reliability of the leakage current protection accessory.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and in particular to a leakage current protection accessory. Background Technology

[0002] A switching assembly may include a connected switch body and a residual current device (RCD) accessory. The switch body may be at least one of a circuit breaker, a relay, or other switches. The switching assembly may be electrically connected to a circuit and control the on / off state of the circuit.

[0003] For example, when the switch body is a circuit breaker, the circuit breaker can provide overload, short circuit, and leakage protection for the circuit, reducing the possibility of further escalation of circuit faults. The leakage protection function of the switch assembly can be provided by a leakage protection accessory electrically connected to the circuit breaker. The leakage protection accessory includes a first terminal and a conductive structure, through which the first terminal can be electrically connected to the switch body.

[0004] Based on the existing structure of leakage current protection accessories, short circuits can easily occur between different conductive components in the conductive structure, which in turn affects the reliability of the leakage current protection accessories. Utility Model Content

[0005] This application provides a leakage current protection accessory that can increase the distance between different conductive components, reduce the possibility of short circuits between different conductive components, and ensure the reliability of the leakage current protection accessory.

[0006] In a first aspect, this application provides a leakage current protection accessory applied to a switch assembly. The leakage current protection accessory includes a mounting housing, a zero-sequence current transformer, and a conductive structure. The mounting housing has a mounting groove. The zero-sequence current transformer is mounted into the mounting housing from the mounting groove. The zero-sequence current transformer has a through hole, the size of which along a first direction is larger than its size along a second direction. The conductive structure passes through the through hole, and one end of the conductive structure is electrically connected to the switch body of the switch assembly. Along the first direction, the size of the mounting groove is larger than the size of the through hole. The conductive structure includes at least two conductive elements, the first direction being the arrangement direction of the at least two conductive elements, and the second direction being perpendicular to both the first direction and the direction in which the conductive structure passes through the through hole.

[0007] In this example, the mounting housing provides installation space for the zero-sequence current transformer and the conductive structure. The conductive structure passes through the through-hole of the zero-sequence current transformer, and one end of the conductive structure is connected to the switch body, that is, the electrical connection between the leakage protection accessory and the switch body can be achieved through the conductive structure.

[0008] Compared to existing technologies, where the through-hole of a zero-sequence current transformer is circular and all conductive components in the conductive structure pass through this hole, resulting in close proximity between different conductive components and a higher risk of phase-to-phase short circuits, the present application example sets the dimension of the through-hole along the first direction to be larger than that along the second direction. This increases the distance between different conductive components passing through the through-hole, reducing the likelihood of short circuits between different conductive components and ensuring the reliability of the leakage protection accessory.

[0009] Furthermore, since the size of the mounting groove is larger than that of the through hole, when the conductive structure passes through the through hole and extends from the mounting groove to the mounting housing, the distance between different conductive components can be equal to or greater than the distance between different conductive components in the through hole, which can further reduce the possibility of short circuits between different conductive components.

[0010] In some possible implementations, the leakage protection accessory also includes a wiring structure connected to one end of the conductive structure away from the switch body. The wiring structure includes at least two first terminals, and the arrangement direction of at least two conductive elements is parallel to the center line of the through hole.

[0011] In this application example, at least two conductive elements are arranged parallel to the center line of the through hole with the first terminal block. This makes the conductive elements have a straight plate-like structure in the direction parallel to the center line of the through hole, which can reduce or even avoid the setting of bending parts in the direction parallel to the center line of the through hole, simplify the structure of the conductive elements, and reduce the manufacturing cost of the conductive elements.

[0012] In some possible implementations, the mounting housing includes a spacer plate disposed between the wiring structure and the zero-sequence current transformer. The spacer plate has mounting holes corresponding to the positions of the conductive components, through which the conductive components can pass.

[0013] In this example, since the partition plate is located between the zero-sequence current transformer and the wiring structure, the partition plate can reduce the possibility of the power supply line accidentally touching the zero-sequence current transformer during the connection process between the power supply line and the first terminal, reduce the possibility of the power supply line damaging the zero-sequence current transformer during the connection process between the power supply line and the first terminal, and ensure the reliability of the leakage protection accessory.

[0014] In some possible implementations, the spacer plate has a limiting protrusion on the side facing the zero-sequence current transformer, and the limiting protrusion is located between the zero-sequence current transformer and the side wall of the mounting housing arranged along the first direction.

[0015] In this example, the limiting protrusion is located between the zero-sequence current transformer and the side wall of the mounting housing. During the use of the leakage protection accessory, when the zero-sequence current transformer contacts the limiting protrusion, the limiting protrusion can provide force to the zero-sequence current transformer, reducing the amplitude of the zero-sequence current transformer's sway relative to the mounting housing.

[0016] In some possible implementations, the first terminal block includes a terminal frame and a terminal plate. A portion of the terminal plate, away from the conductive structure, protrudes from the side wall of the terminal frame to form a limiting part. This limiting part abuts against the side wall of the mounting housing away from the mounting groove. Along the direction from the zero-sequence current transformer to the wiring structure, the projection of the limiting part is outside the projection range of the terminal frame. Abutting structure is provided on the side of the spacer away from the zero-sequence current transformer, and this abutting structure abuts against the limiting part.

[0017] In this example, the abutment structure is located on the side of the spacer away from the zero-sequence current sensor, and the abutment structure can abut against the limiting part, applying force to the limiting part, thus making the fit between the limiting part and the mounting housing more reliable. Furthermore, since the limiting part is part of the terminal block, and the terminal block is part of the first terminal, the fit between the mounting housing's side wall away from the mounting groove and the abutment structure makes the fit between the first terminal and the mounting housing more reliable.

[0018] In some possible implementations, the abutting structure includes an extension and an abutting portion. The extension extends toward the limiting portion, and the abutting portion is located on the side of the extension toward the limiting portion, with the abutting portion in contact with the limiting portion surface.

[0019] Since the projection of the limiting part is located outside the projection range of the wiring frame along the direction from the zero-sequence current transformer to the wiring structure, at least one extension of the abutment structure is located between two adjacent first terminals to reduce the possibility of a short circuit between two adjacent first terminals.

[0020] Furthermore, the contact between the abutting part and the limiting part allows the force applied to the limiting part through the abutting part to be more uniform, further improving the reliability of the fit between the limiting part and the mounting housing.

[0021] In some possible implementations, the mounting housing also includes a mating housing body and a baffle. The mounting groove is located on the housing body, and the baffle is connected to the side of the housing body facing the switch body. The baffle partially blocks the mounting groove to form a connection hole for passing a conductive component.

[0022] In this application example, the mounting groove partially blocked by the baffle forms a connection hole, allowing the conductive component to extend from the connection hole into the mounting housing and electrically connect with the switch body.

[0023] In addition, since the baffle can cover part of the mounting slot and the zero-sequence current transformer is installed from the mounting slot into the mounting housing, the area exposed to the outside of the zero-sequence current transformer can be reduced by setting the baffle, so that the baffle can provide protection for the zero-sequence current transformer and reduce the possibility of the zero-sequence current transformer being damaged during use.

[0024] In some possible implementations, the shell body includes a first shell and a second shell. The second shell has a mounting groove on the side away from the first shell. The first shell has at least two wiring grooves spaced apart on the side facing the second shell. A first wiring terminal is installed in each wiring groove. An insulating plate is provided between two adjacent wiring grooves. The second shell has a locking groove, and at least part of the insulating plate is locked into the locking groove.

[0025] In this application example, the wiring groove can provide installation space for the first terminal block. The insulating plate is placed between two adjacent wiring grooves, which can increase the insulation gap between two adjacent first terminals, improve the phase-to-phase insulation between two adjacent first terminals, reduce the possibility of short circuit between two adjacent first terminals, and ensure the safety and reliability of the leakage protection accessory.

[0026] In some possible implementations, the mounting housing includes a mounting plate, a mounting groove is provided on the mounting plate, and the mounting plate is also provided with a limiting hole on the side of the mounting plate facing the wiring structure. The conductive component includes a connecting plate and a wiring plate arranged at an angle. The connecting plate is provided on the side of the mounting plate facing the wiring structure and passes through the limiting hole. The wiring plate is electrically connected to the switch body.

[0027] In this example, the limiting hole is located on the mounting plate, which is part of the mounting housing. The connecting plate is part of the conductive component, and it can pass through the limiting hole. Therefore, the cooperation between the connecting plate and the limiting hole ensures the reliability of the connection between the conductive component and the mounting housing. The wiring plate can be electrically connected to the switch body, and since it is part of the conductive component, the wiring plate enables the electrical connection between the conductive component and the switch body, thereby achieving the electrical connection between the leakage current protection accessory and the switch body.

[0028] In some possible implementations, the mounting housing is also provided with a limiting groove, which is spaced apart from the mounting groove. The limiting groove is positioned to correspond to the limiting hole, and the groove wall of the limiting groove can abut against the wiring sub-board.

[0029] In this example, since the conductive component includes a connecting plate and a wiring plate, with the connecting plate passing through the limiting hole and the wall of the limiting groove abutting against the wiring plate, the wall of the limiting hole and the wall of the limiting groove can limit the conductive component from different positions, further ensuring the assembly reliability of the conductive component and the mounting housing. Furthermore, the mounting plate has a limiting groove, allowing the conductive component to extend from the limiting groove into the mounting housing and connect with the switch body, thus realizing the connection between the switch body and the leakage protection accessory. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a leakage current protection accessory provided as an example of this application.

[0031] Figure 2 This is a schematic diagram of the internal structure of a leakage current protection accessory provided as an example in this application.

[0032] Figure 3 A schematic diagram of a second housing provided as an example of this application from a first-view perspective.

[0033] Figure 4 This is a schematic diagram illustrating the fit between a second housing and a wiring structure, as provided in this application example.

[0034] Figure 5 A schematic diagram of the structure of a second housing provided as an example of this application from a second perspective.

[0035] Figure 6 This is a schematic diagram of the structure of a first shell provided as an example of this application.

[0036] Figure 7 A schematic diagram of the structure of a second shell provided as an example of this application from a third-view perspective.

[0037] Figure 8 This is a structural schematic diagram of a leakage current protection accessory provided as an example of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. Leakage protection accessory; 110. Mounting housing; 111. First housing; 112. Second housing; 113. Baffle; 114. Mounting groove; 115. Spacer plate; 1151. Mounting hole; 1152. Slot; 1153. Limiting protrusion; 116. Abutment structure; 1161. Extension; 1162. Abutment part; 117. Mounting plate; 1171. Limiting hole; 1172. Limiting groove; 118. Wiring groove; 119. Insulating plate; 120. Zero-sequence current transformer; 130. Conductive structure; 131. Conductive component; 140. Wiring structure; 141. Terminal block; 1411. Limiting part; 150. Circuit board structure; OX, First direction; OY, Second direction. Detailed Implementation

[0040] To make the purpose, technical solutions, and advantages of the examples in this application clearer, the technical solutions in the examples of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described examples are only a part of the examples in this application, not all of them. Based on the examples in this application, all other examples obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terms used herein in the description of the application are for the purpose of describing particular examples only and are not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the description, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0042] In this document, the term "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of this application. The appearance of the phrase "example" in various places in the specification does not necessarily refer to the same example, nor is it a separate or alternative example mutually exclusive with other examples. It will be explicitly and implicitly understood by those skilled in the art that the examples described herein can be combined with other examples.

[0043] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0044] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the leakage protection accessory of this application.

[0045] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0046] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0047] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] Based on the above, this application provides an example of a leakage current protection accessory and a switch assembly.

[0049] To enable those skilled in the art to better understand the present application, the leakage current protection accessories and switch components provided in the present application will be clearly and completely described below with reference to the accompanying drawings.

[0050] For example, this application provides a switch assembly including a leakage current protection accessory and at least two switch bodies, wherein the leakage current protection accessory is electrically connected to the switch bodies.

[0051] The switch body may include at least one of a circuit breaker, a relay, or other switches. The switch body, in conjunction with residual current devices (RCDs), can provide residual current protection for circuits electrically connected to the switch assembly, ensuring the reliability of the circuit operation.

[0052] The structure of the switch body is similar to that of the switch body in the prior art, and will not be described in detail here.

[0053] The switch assembly may include two, three, four, or other switch bodies, and this application example does not impose specific limitations on this.

[0054] The switch body has a second terminal on the side facing the mounting housing. The leakage current protection accessory can be connected to the second terminal through a conductive structure to achieve electrical connection between the switch body and the leakage current protection accessory. Each switch body has one second terminal, and the number of second terminals is equal to the number of conductive elements in the conductive structure, with one second terminal connected to one conductive element.

[0055] Since the examples in this application include the leakage current protection accessories mentioned below, the embodiments of this application have the functions of the leakage current protection accessories provided in the embodiments below.

[0056] Next, the structure of the leakage current protection accessory will be described in detail.

[0057] For example, this application provides a leakage current protection accessory. Figure 1 This application provides a schematic diagram of the structure of a leakage current protection accessory. Figure 2 This application provides a schematic diagram of the internal structure of a leakage current protection accessory. Figure 3 A schematic diagram of the structure of a second housing provided as an example in this application from a first-view perspective is shown below. Figures 1-3 The leakage current protection accessory 100 includes a mounting housing 110, a zero-sequence current transformer 120, and a conductive structure 130. The mounting housing 110 has a mounting groove 114. The zero-sequence current transformer 120 is installed into the mounting housing 110 from the mounting groove 114. The zero-sequence current transformer 120 has a through hole, the dimension of which along the first direction OX is larger than the dimension along the second direction OY. The conductive structure 130 passes through the through hole, and one end of the conductive structure 130 is electrically connected to the switch body of the switch assembly.

[0058] Along the first direction OX, the size L of the mounting groove 114 is larger than the size of the through hole. The conductive structure 130 includes at least two conductive elements 131. The first direction OX is the arrangement direction of the at least two conductive elements 131. The second direction OY is perpendicular to the first direction OX and perpendicular to the direction through which the conductive structure 130 passes.

[0059] The mounting housing 110 can be made of insulating materials, such as polyvinyl chloride, polycarbonate (also known as PC plastic), etc. The mounting housing 110 made of insulating materials can reduce the possibility of current escaping from the mounting housing 110 to the outside of the mounting housing 110, ensuring the safety of the leakage protection accessory 100, and thus ensuring the safety of the switch assembly.

[0060] The conductive element 131 includes at least two conductive elements 131. The number of conductive elements 131 is equal to the number of switch bodies, and the conductive elements 131 correspond one-to-one with the switch bodies, that is, one conductive element 131 is connected to one switch body.

[0061] The mounting housing 110 includes a receiving cavity communicating with the mounting slot 114, into which the zero-sequence current transformer 120 can be installed from the mounting slot 114 into the receiving cavity.

[0062] Based on the fact that the dimension of the through hole along the first direction OX is greater than the dimension of the through hole along the second direction OY, the dimension of the zero-sequence current transformer 120 along the first direction OX is greater than the dimension of the zero-sequence current transformer 120 along the second direction OY. The first direction OX can be regarded as the length direction of the zero-sequence current transformer 120. The second direction OY can be regarded as the width direction of the zero-sequence current transformer 120. Therefore, the cross-section of the zero-sequence current transformer 120 can be rectangular, elliptical, oblong, etc. The shape of the through hole can be the same as or different from the shape of the cross-section of the zero-sequence current transformer 120. This application example only describes the zero-sequence current transformer 120 with an oblong cross-section and an oblong through hole as an example. Oblong refers to a shape with a rectangular middle section and two opposite ends that are arc-shaped.

[0063] Along the first direction OX, the size L of the mounting slot 114 can be less than or equal to the size of the zero-sequence current transformer 120.

[0064] Along the first direction OX, when the size L of the mounting slot 114 is equal to the size of the zero-sequence current transformer 120, during the process of installing the zero-sequence current transformer 120 into the mounting housing 110, a force can be applied to the zero-sequence current transformer 120 toward the mounting housing 110 so that the zero-sequence current transformer 120 can be installed into the mounting housing 110.

[0065] Along the first direction OX, when the dimension L of the mounting groove 114 is smaller than the dimension of the zero-sequence current transformer 120, during the installation of the zero-sequence current transformer 120 into the mounting housing 110, one end of the zero-sequence current transformer 120 can first extend into the mounting housing 110 from the mounting groove 114, and the other end of the zero-sequence current transformer 120 subsequently extends into the mounting housing 110 from the mounting groove 114, so that the zero-sequence current transformer 120 can be installed into the mounting housing 110. If the zero-sequence current transformer 120 tends to detach from the mounting housing 110, the housing wall with the mounting groove 114 can contact the zero-sequence current transformer 120, reducing the possibility of the zero-sequence current transformer 120 detaching from the mounting groove 114.

[0066] Since the through hole is located in the zero-sequence current transformer 120, the size of the through hole is smaller than the size of the zero-sequence current transformer 120 in the first direction OX. Along the first direction OX, the size L of the mounting groove 114 is larger than the size of the through hole.

[0067] In this example, the mounting housing 110 provides installation space for the zero-sequence current transformer 120 and the conductive structure 130. The conductive structure 130 passes through the through hole of the zero-sequence current transformer 120, and one end of the conductive structure 130 is connected to the switch body, that is, the electrical connection between the leakage protection accessory 100 and the switch body can be realized through the conductive structure 130.

[0068] Compared to existing technologies, where the through-hole of a zero-sequence current transformer is circular and all conductive components in the conductive structure pass through this through-hole, resulting in close proximity between different conductive components and a higher risk of phase-to-phase short circuits, in this application example, the dimension of the through-hole along the first direction OX is larger than the dimension along the second direction OY. This results in a larger distance between different conductive components 131 passing through the through-hole, reducing the possibility of short circuits between different conductive components 131 and ensuring the reliability of the leakage protection accessory 100.

[0069] Furthermore, since the size L of the mounting groove 114 is larger than the size of the through hole along the first direction OX, when the conductive structure 130 passes through the through hole and extends from the mounting groove 114 to the mounting housing 110, the distance between different conductive elements 131 can be equal to or greater than the distance between different conductive elements 131 in the through hole, which can further reduce the possibility of short circuits between different conductive elements 131.

[0070] Based on the leakage protection accessory 100 provided in the above example, Figure 4 Please refer to the schematic diagram of the fit between the second housing and the wiring structure provided as an example of this application. Figures 1-4 The leakage protection accessory 100 also includes a wiring structure 140, which is connected to the end of the conductive structure 130 away from the switch body. The wiring structure 140 includes at least two first terminals, at least two conductive elements 131, and the arrangement direction of the first terminals is parallel to the center line of the through hole.

[0071] The wiring structure 140 includes at least two first terminals, the number of which is equal to the number of conductive elements 131, and each first terminal corresponds to a conductive element 131. The wiring structure 140 is connected to the end of the conductive structure 130 facing away from the switch body. Referring to the previous description of the connection between the leakage protection accessory 100 and the switch body, one end of the conductive element 131 is connected to a first terminal, and the other end of the conductive element 131 is connected to the corresponding switch body. The first terminals enable electrical connection between the power supply line and the leakage protection accessory 100.

[0072] At least two conductive elements 131 are arranged parallel to the center line of the through hole along with the first terminal block. The first terminal block can have two, three, four, etc. The number of first terminal blocks and conductive elements 131 is equal to the number of switch bodies, and each first terminal block and conductive element 131 corresponds one-to-one with the switch body.

[0073] For example, when there are four switch bodies, the four switch bodies correspond to an A-phase switch body, a B-phase switch body, a C-phase switch body, and an N-phase switch body. The conductive structure 130 includes an A-phase conductive element connected to the A-phase switch body, a B-phase conductive element connected to the B-phase switch body, a C-phase conductive element connected to the C-phase switch body, and an N-phase conductive element connected to the N-phase switch body. The wiring structure 140 includes an A-phase first terminal connected to the A-phase switch body, a B-phase first terminal connected to the B-phase switch body, a C-phase first terminal connected to the C-phase switch body, and an N-phase first terminal connected to the N-phase switch body.

[0074] At this point, at least the arrangement direction of the B-phase conductive element and the B-phase first terminal should be parallel to the center line of the through hole, and the arrangement direction of the C-phase conductive element and the C-phase first terminal should also be parallel to the center line of the through hole. Based on this, the arrangement direction of the A-phase conductive element and the A-phase first terminal can also be parallel to the center line of the through hole, and / or, the arrangement direction of the N-phase conductive element and the N-phase first terminal can also be parallel to the center line of the through hole.

[0075] In this application example, at least two conductive elements 131 are arranged parallel to the center line of the through hole with the first terminal, so that the conductive elements 131 are arranged in a straight plate shape in the direction parallel to the center line of the through hole. This can reduce or even avoid the conductive elements 131 having a bent part in the direction parallel to the center line of the through hole, simplify the structure of the conductive elements 131, and reduce the manufacturing cost of the conductive elements 131.

[0076] Based on the leakage current protection accessory 100 provided in the above example, please refer to... Figures 1-3 The mounting housing 110 includes a spacer plate 115, which is located between the wiring structure 140 and the zero-sequence current transformer 120. The spacer plate 115 has a mounting hole 1151 corresponding to the position of the conductive element 131, and the conductive element 131 can pass through the mounting hole 1151.

[0077] The mounting housing 110 can be a single-piece housing, or it can be formed by the cooperation of multiple sub-housing units. When the mounting housing 110 is a single-piece structure, the spacer 115 can be a plate-like structure disposed between the zero-sequence current transformer 120 and the wiring structure 140. When the mounting housing 110 is formed by the cooperation of multiple sub-housing units, the spacer 115 can be the housing wall of one sub-housing unit, or it can be a structure formed by the cooperation of two sub-housing units; this application does not impose specific limitations in this regard.

[0078] Since one end of the conductive structure 130 is connected to the wiring structure 140, and the other end of the conductive structure 130 passes through the through hole of the zero-sequence current transformer 120 and is connected to the switch body, and the spacer plate 115 is disposed between the zero-sequence current transformer 120 and the wiring structure 140, the spacer plate 115 can be provided with mounting holes 1151 corresponding to the conductive element 131, so that the conductive element 131 can pass through the spacer plate 115 through the mounting holes 1151 to realize the electrical connection between the wiring structure 140 and the switch body.

[0079] The number of mounting holes 1151 can be equal to the number of conductive elements 131, in which case one mounting hole 1151 corresponds to one conductive element 131. Alternatively, the number of mounting holes 1151 can be less than the number of conductive elements 131, in which case one mounting hole 1151 mates with at least one conductive element 131. The mounting hole 1151 can be a complete hole-like structure provided in the mounting housing 110, or the mounting hole 1151 can be a groove-like structure provided in the side wall of the mounting housing 110 and a hole-like structure formed by mating with the bottom wall of the mounting housing 110.

[0080] In this application example, since the partition plate 115 is located between the zero-sequence current transformer 120 and the wiring structure 140, during the connection process between the power supply line and the first terminal, the partition plate 115 can reduce the possibility of the power supply line accidentally touching the zero-sequence current transformer 120, reduce the possibility of the power supply line damaging the zero-sequence current transformer 120 during the connection process between the power supply line and the first terminal, and ensure the reliability of the leakage protection accessory 100.

[0081] Based on the leakage current protection accessory 100 provided in the above example, please refer to... Figures 1-3 The spacer plate 115 is provided with a limiting protrusion 1153 on the side facing the zero-sequence current transformer 120. The limiting protrusion 1153 is located between the zero-sequence current transformer 120 and the side wall of the mounting housing 110 arranged along the first direction OX.

[0082] The limiting protrusion 1153 can be a ridge structure, a column structure, or other protrusion structure.

[0083] Along the first direction OX, the size of the limiting protrusion 1153 can be less than or equal to the distance between the zero-sequence current transformer 120 and the side wall of the housing. The limiting protrusion 1153 can be provided only between the zero-sequence current transformer 120 and one side wall of the mounting housing 110. Alternatively, two limiting protrusions 1153 can be provided, with one limiting protrusion 1153 provided between the zero-sequence current transformer 120 and one side wall of the mounting housing 110, and the other limiting protrusion 1153 provided between the zero-sequence current transformer 120 and the other side wall of the mounting housing 110.

[0084] In this example, the limiting protrusion 1153 is located between the zero-sequence current transformer 120 and the side wall of the mounting housing 110. During the use of the leakage protection accessory 100, when the zero-sequence current transformer 120 contacts the limiting protrusion 1153, the limiting protrusion 1153 can provide a force to the zero-sequence current transformer 120, reducing the amplitude of the shaking of the zero-sequence current transformer 120 relative to the mounting housing 110.

[0085] Based on the leakage current protection accessory 100 provided in the above example, please refer to... Figure 4 The first terminal block includes a wiring frame and a wiring plate 141. A portion of the wiring plate 141, away from the conductive structure 130, protrudes from the side wall of the wiring frame to form a limiting portion 1411. The limiting portion 1411 abuts against the side wall of the mounting housing 110 away from the mounting groove 114. Along the direction from the zero-sequence current transformer 120 to the wiring structure 140, the projection of the limiting portion 1411 is outside the projection range of the wiring frame. Abutment structure 116 is provided on the side of the spacer 115 opposite to the zero-sequence current transformer 120, and abuts against the limiting portion 1411.

[0086] The wiring frame has the same structure as the wiring frame in the prior art, and the structure of the wiring frame will not be described in detail in this application.

[0087] The terminal block 141 includes a terminal block body plate and a snap-fit ​​sub-plate. The snap-fit ​​sub-plate is located at the end of the terminal block body plate away from the switch body. The terminal block body plate and the snap-fit ​​sub-plate can be located on the same horizontal plane, or the terminal block body plate can be set basically perpendicular to the snap-fit ​​sub-plate.

[0088] The wiring body plate and the snap-fit ​​subplate are basically perpendicular, meaning that the included angle formed by the wiring body plate and the snap-fit ​​subplate is greater than or equal to 85° and less than or equal to 95°.

[0089] Regardless of whether the wiring body plate and the snap-fit ​​subplate are on the same horizontal plane or are set basically perpendicularly, part of the snap-fit ​​subplate can extend out of the side wall of the wiring frame to form a limiting part 1411. The side wall of the mounting housing 110 away from the mounting groove 114 is provided with a snap-fit ​​groove, and the limiting part 1411 can be installed into the snap-fit ​​groove, or the limiting part 1411 can directly abut against the side wall of the mounting housing 110 away from the mounting groove 114.

[0090] The abutment structure 116 can be a plate-like structure, column-like structure, etc., that protrudes from the partition plate 115.

[0091] In this application example, the abutment structure 116 is located on the side of the spacer 115 away from the zero-sequence current sensor, and the abutment structure 116 can abut against the limiting part 1411, applying force to the limiting part 1411, making the fit between the limiting part 1411 and the mounting housing 110 more reliable. Furthermore, since the limiting part 1411 is part of the terminal block 141, and the terminal block 141 is part of the first terminal block, the fit between the side wall of the mounting housing 110 away from the mounting groove 114 and the abutment structure 116 makes the fit between the first terminal block and the mounting housing 110 more reliable.

[0092] Based on the leakage protection accessory 100 provided in the above example, Figure 5 A schematic diagram of the second housing provided as an example in this application from a second-view perspective is shown below. Figure 4 and Figure 5 The abutting structure 116 includes an extension 1161 and an abutting portion 1162. The extension 1161 extends toward the limiting portion 1411, and the abutting portion 1162 is disposed on the side of the extension 1161 toward the limiting portion 1411. The abutting portion 1162 is in contact with the limiting portion 1411.

[0093] Both the extension 1161 and the abutment 1162 can be plate-shaped structures, and the extension 1161 and the abutment 1162 are perpendicular to each other.

[0094] Since the projection of the limiting portion 1411 is located outside the projection range of the wiring frame along the direction from the zero-sequence current transformer 120 to the wiring structure 140, at least one extension 1161 of the abutment structure 116 is located between two adjacent first terminals to reduce the possibility of a short circuit between two adjacent first terminals.

[0095] Furthermore, the contact portion 1162 and the limiting portion 1411 are in surface contact, which makes the force applied to the limiting portion 1411 through the contact portion 1162 more uniform, and further improves the reliability of the fit between the limiting portion 1411 and the mounting housing 110.

[0096] Based on the leakage current protection accessory 100 provided in the above example, please refer to... Figures 1-3 The mounting housing 110 also includes a housing body and a baffle 113 that cooperate with it. The mounting groove 114 is provided in the housing body. The baffle 113 is connected to the side of the mounting housing 110 facing the switch body. The baffle 113 blocks part of the mounting groove 114 to form a connection hole. The connection hole is used to pass through the conductive element 131.

[0097] The baffle 113 can be connected to the shell body by means of snap-fit, riveting, threaded connection, etc.

[0098] The baffle 113 can shield the mounting groove 114 to form multiple connecting holes spaced apart. The number of connecting holes is equal to the number of conductive parts 131, and the connecting holes correspond one-to-one with the conductive parts 131.

[0099] In this application example, the baffle 113 blocks part of the mounting groove 114 to form a connection hole, so that the conductive element 131 can extend out of the mounting housing 110 from the connection hole and be electrically connected to the switch body.

[0100] Furthermore, since the baffle 113 can partially cover the mounting slot 114, and the zero-sequence current transformer 120 is installed from the mounting slot 114 into the mounting housing 110, the area exposed to the outside of the zero-sequence current transformer 120 can be reduced by setting the baffle 113, so that the baffle can provide protection for the zero-sequence current transformer 120 and reduce the possibility of the zero-sequence current transformer 120 being damaged during use.

[0101] Based on the leakage protection accessory 100 provided in the above example, Figure 6 Please refer to the structural schematic diagram of a first shell provided as an example of this application. Figure 1 , Figure 3 and Figure 6 The shell body includes a first shell 111 and a second shell 112. The second shell 112 is provided with a mounting groove 114 on the side away from the first shell 111. The first shell 111 is provided with at least two wiring grooves 118 at intervals on the side facing the second shell 112. A first wiring terminal is installed in each wiring groove 118. An insulating plate 119 is provided between two adjacent wiring grooves 118. The second shell 112 is provided with a slot 1152, and at least part of the insulating plate 119 is snapped into the slot 1152.

[0102] The first housing 111 and the second housing 112 can be connected together by snap-fit, groove and protrusion fitting, riveting, or other methods.

[0103] The insulating plate 119 can be integrally formed with the first housing 111, or it can be connected to the first housing 111 by snap-fit ​​or other means. The insulating plate 119 can extend into the through-hole of the zero-sequence current transformer 120. The dimension of the portion of the insulating plate 119 extending into the through-hole along the second direction OY is substantially equal to the dimension of the through-hole along the second direction OY. This means that, along the second direction OY, the dimension of the portion of the insulating plate 119 extending into the through-hole is smaller than the dimension of the through-hole, and the difference between the dimension of the portion of the insulating plate 119 extending into the through-hole and the dimension of the through-hole is less than or equal to 3 mm.

[0104] By setting a portion of the insulating plate 119 to extend into the through hole of the zero-sequence current transformer 120, the dimension of the portion of the insulating plate 119 extending into the through hole along the second direction OY is basically equal to the dimension of the through hole along the second direction OY. This allows the insulating plate 119 to provide support for the zero-sequence current transformer 120, reducing the amplitude of the shaking of the zero-sequence current transformer 120 relative to the mounting housing 110, and ensuring the installation reliability of the zero-sequence current transformer 120 and the mounting housing 110.

[0105] In this application example, the wiring groove 118 can provide installation space for the first terminal block. The insulating plate 119 is disposed between two adjacent wiring grooves 118, which can increase the insulation gap between two adjacent first terminals, improve the phase-to-phase insulation between two adjacent first terminals, reduce the possibility of short circuit between two adjacent first terminals, and ensure the safety and reliability of the leakage protection accessory 100.

[0106] Based on the switch assembly provided in the above example, the first housing 111 has a guide groove on the side facing the second housing 112. The guide groove is connected to the wiring groove 118. The first wiring terminal includes an adjusting screw. The guide groove cooperates with the adjusting screw, and the adjusting screw is movable in the guide groove.

[0107] The first terminal block also includes a terminal frame and a terminal block 141. An adjusting screw is threadedly connected to the terminal block 141 and the terminal frame, or the adjusting screw is fixedly connected to the terminal block 141 and threadedly connected to the terminal frame. By adjusting the distance between the terminal block 141 and the frame wall of the terminal block, the terminal block 141 can clamp the power supply wire or separate from the power supply wire. The frame wall of the terminal block mentioned here refers to the frame wall that allows the terminal block to clamp the power supply wire with the terminal block 141 along the direction of movement of the adjusting screw.

[0108] In this example, the adjusting screw is movable within the guide groove, meaning the guide groove can restrict the direction of movement of the adjusting screw, ensuring the reliability of the adjusting screw driving the terminal block 141 to move relative to the terminal frame.

[0109] Based on the leakage protection accessory 100 provided in the above example, Figure 7 Please refer to the structural schematic diagram of the second shell in a third-view perspective, which is provided as an example of this application. Figure 7 The mounting housing 110 includes a mounting plate 117, a mounting groove 114 is provided on the mounting plate 117, and the mounting plate 117 is also provided with a limiting hole 1171. The limiting hole 1171 is provided on the side of the mounting plate 117 facing the wiring structure 140. The conductive component 131 includes a connecting plate and a wiring plate arranged at an angle. The connecting plate is provided on the side of the mounting plate 117 facing the wiring structure 140, and the connecting plate passes through the limiting hole 1171. The wiring plate is electrically connected to the switch body.

[0110] Here, the mounting plate 117 can be specifically disposed in the second housing 112 within the mounting housing 110.

[0111] Two limiting holes 1171 may be provided at intervals, and the setting position of the limiting holes 1171 corresponds to the setting position of the connecting plate. Along the first direction OX, the arrangement direction of the first terminal block and the limiting holes 1171 is parallel to the center line of the through hole.

[0112] The angle formed by the connection panel and the wiring panel is greater than or equal to 85° and less than or equal to 95°.

[0113] When the conductive element 131 includes a connecting plate and a wiring plate, the conductive element 131 may also include a flexible connection structure, one end of which is connected to the first wiring terminal, and the other end of which is connected to the connecting plate. The connecting plate is arranged parallel to the mounting plate 117 and passes through the limiting hole 1171. The wiring plate 141 is arranged perpendicular to the mounting plate 117, and the mounting plate 117 can be connected to the switch body.

[0114] In this example, the limiting hole 1171 is provided on the mounting plate 117, which is part of the mounting housing 110. The connecting plate is part of the conductive element 131. The connecting plate can pass through the limiting hole 1171. Therefore, the cooperation between the connecting plate and the limiting hole 1171 ensures the reliable connection between the conductive element 131 and the mounting housing 110. The wiring branch can be electrically connected to the switch body, and since the wiring branch is part of the conductive element 131, the electrical connection between the conductive element 131 and the switch body can be achieved through the wiring branch, thereby achieving the electrical connection between the leakage protection accessory 100 and the switch body.

[0115] Based on the leakage current protection accessory 100 provided in the above example, please refer to... Figure 3 The mounting housing 110 is also provided with a limiting groove 1172. The limiting groove 1172 is spaced apart from the mounting groove 114. The limiting groove 1172 is positioned corresponding to the limiting hole 1171. The groove wall of the limiting groove 1172 can abut against the wiring branch board.

[0116] The opening of the limiting groove 1172 can be set towards the side wall of the mounting housing 110, or the opening of the limiting groove 1172 can be set towards the bottom wall of the mounting housing 110.

[0117] In this example, since the conductive component 131 includes a connecting plate and a wiring plate, with the connecting plate passing through the limiting hole 1171 and the groove wall of the limiting groove 1172 abutting against the wiring plate, the hole wall of the limiting hole 1171 and the groove wall of the limiting groove 1172 can limit the conductive component 131 from different positions, further ensuring the assembly reliability of the conductive component 131 and the mounting housing 110. Furthermore, the mounting plate 117 is provided with a limiting groove 1172, allowing the conductive component 131 to extend out of the mounting housing 110 from the limiting groove 1172 and connect with the switch body, thus realizing the connection between the switch body and the leakage protection accessory 100.

[0118] Based on the switch component provided in the example above. Figure 8 Please refer to the structural schematic diagram of a leakage current protection accessory provided as an example in this application. Figure 8 The leakage protection accessory 100 also includes a circuit board structure 150, which is connected to the same side of the mounting housing 110 as the switch body, and is electrically connected to the zero-sequence current transformer 120.

[0119] The circuit board structure 150 can be electrically connected to the zero-sequence current transformer 120 via wired or wireless means. This allows the zero-sequence current transformer 120 to transmit a weak electrical signal, converted from a leakage current signal, to the circuit board structure 150. The circuit board structure 150 then amplifies and analyzes this weak signal to determine if leakage has occurred in the circuit, and executes corresponding steps based on the determination. For example, if the circuit board structure 150 determines that leakage has occurred, the leakage protection accessory 100 sends a signal to the operating mechanism of the switch assembly through the circuit board structure 150. This causes the operating mechanism to activate, switching the switch body from a closed state to an open state, thereby reducing the possibility of further expansion of the leakage fault in the circuit.

[0120] In this application example, the circuit board structure 150, together with the zero-sequence current transformer 120, provides more reliable protection for the circuit and ensures the reliability of the leakage protection accessory 100.

[0121] The connection method between the circuit board structure 150 and the mounting housing 110 is similar to the connection method between the switch body and the mounting housing 110. Hereinafter, the connection method between the circuit board structure 150 and the mounting housing 110 and the connection method between the switch body and the mounting housing 110 will be described by way of example only.

[0122] For example, the circuit board structure 150 has a slot 1152 structure on the side facing the mounting housing 110, and the mounting housing 110 has a hook structure on the side facing the circuit board structure 150. The hook structure can extend into the slot 1152 structure to achieve the connection between the circuit board structure 150 and the mounting housing 110.

[0123] Alternatively, the circuit board structure 150 may have a hook structure on the side facing the mounting housing 110, and the mounting housing 110 may have a slot 1152 structure on the side facing the circuit board structure 150. The hook structure may extend into the slot 1152 structure to achieve the connection between the circuit board structure 150 and the mounting housing 110.

[0124] For example, the circuit board structure 150 has a snap-fit ​​protrusion on the side facing the mounting housing 110, and the mounting housing 110 has a snap-fit ​​groove on the side facing the circuit board structure 150. The snap-fit ​​protrusion can extend into the snap-fit ​​groove to achieve the connection between the circuit board structure 150 and the mounting housing 110.

[0125] Alternatively, the circuit board structure 150 has a snap-fit ​​groove on the side facing the mounting housing 110, and the mounting housing 110 has a snap-fit ​​protrusion on the side facing the circuit board structure 150. The snap-fit ​​protrusion can extend into the snap-fit ​​groove to achieve the connection between the circuit board structure 150 and the mounting housing 110.

[0126] The circuit board structure 150 and the mounting housing 110 can also be connected together by means of threaded connection, riveting, etc., and this application example does not make specific limitations in this regard.

[0127] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electrical leakage protection accessory characterised in that, The leakage current protection accessory is applied to the switch assembly, and the leakage current protection accessory includes: The mounting housing is equipped with a mounting slot; A zero-sequence current transformer is installed from the mounting slot into the mounting housing. The zero-sequence current transformer has a through hole, and the dimension of the through hole along a first direction is larger than the dimension of the through hole along a second direction. A conductive structure is provided through the through hole, and one end of the conductive structure is electrically connected to the switch body of the switch assembly; Wherein, along the first direction, the size of the mounting groove is larger than the size of the through hole, the conductive structure includes at least two conductive elements, the first direction is the arrangement direction of the at least two conductive elements, the second direction is perpendicular to the first direction and the direction in which the conductive structure passes through the through hole.

2. The ground fault protection accessory of claim 1, wherein, The leakage protection accessory also includes a wiring structure, which is connected to the end of the conductive structure away from the switch body. The wiring structure includes at least two first terminals, and the arrangement direction of at least two of the conductive elements is parallel to the center line of the through hole.

3. The ground fault protection accessory of claim 2, wherein, The mounting housing includes a spacer plate, which is disposed between the wiring structure and the zero-sequence current transformer. The spacer plate has mounting holes corresponding to the positions of the conductive elements, and the conductive elements can pass through the mounting holes.

4. The ground fault protection accessory of claim 3, wherein, The spacer plate has a limiting protrusion on the side facing the zero-sequence current transformer. The limiting protrusion is located between the zero-sequence current transformer and the sidewalls of the mounting housing arranged along the first direction.

5. The residual current protective accessory according to claim 3 or 4, characterized in that, The first terminal block includes a wiring frame and a wiring plate. The portion of the wiring plate away from the conductive structure protrudes from the side wall of the wiring frame to form a limiting part. The limiting part abuts against the side wall of the mounting housing away from the mounting groove. Along the direction from the zero-sequence current transformer to the wiring structure, the projection of the limiting part is outside the projection range of the wiring frame. The spacer plate has an abutment structure on the side opposite to the zero-sequence current transformer, and the abutment structure abuts against the limiting part.

6. The ground fault protection accessory of claim 5, wherein, The abutting structure includes an extension and an abutting portion. The extension extends toward the limiting portion, and the abutting portion is located on the side of the extension toward the limiting portion, with the abutting portion in surface contact with the limiting portion.

7. The ground fault protection accessory of claim 2, wherein, The mounting housing includes a mating housing body and a baffle. The mounting groove is provided in the housing body. The baffle is connected to the side of the housing body facing the switch body. The baffle partially blocks the mounting groove to form a connection hole for the conductive component to pass through.

8. The ground fault protection accessory of claim 7, wherein, The shell body includes a first shell and a second shell. The second shell has the mounting groove on the side away from the first shell. The first shell has at least two wiring grooves spaced apart on the side facing the second shell. Each wiring groove has a first terminal installed in it. An insulating plate is provided between two adjacent wiring grooves. The second shell has a slot, and at least part of the insulating plate is snapped into the slot.

9. The ground fault protection accessory of claim 2, wherein, The mounting housing includes a mounting plate, the mounting groove is disposed on the mounting plate, the mounting plate is also provided with a limiting hole, the limiting hole is disposed on the side of the mounting plate facing the wiring structure, the conductive component includes a connecting plate and a wiring plate arranged at an angle, the connecting plate is disposed on the side of the mounting plate facing the wiring structure, and the connecting plate passes through the limiting hole, the wiring plate is electrically connected to the switch body.

10. The arc fault protection accessory of claim 9, wherein, The mounting housing is also provided with a limiting groove, which is spaced apart from the mounting groove. The limiting groove is positioned corresponding to the limiting hole, and the groove wall of the limiting groove can abut against the wiring branch plate.

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