Residual-current circuit breaker

Abstract

The utility model discloses a residual-current circuit breaker, which comprises a base and a zero sequence mutual inductor, at least two poles of main loop spaces are arranged on the front surface of the base, and a main loop conductor is arranged in each pole of main loop space; wherein the back face of the base is provided with a mutual inductor containing groove, the zero-sequence mutual inductor is located in the mutual inductor containing groove, a center hole of the zero-sequence mutual inductor faces the height direction of the base, and each pole of main loop conductor penetrates through the center hole of the zero-sequence mutual inductor; according to the invention, the occupied space in the length direction of the product is reduced.

Description

Technical Field

[0001] The present application relates to the electrical field, and more particularly to a leakage circuit breaker. Background Art

[0002] As a key component for detecting leakage signals in leakage protection switches, the zero-sequence transformer is installed above the base in the industry, and is designed in such a way that the axis of the center hole of the zero-sequence transformer is parallel to the length direction of the base. For example, the leakage circuit breaker disclosed in CN204303733U adopts this method of installing the zero-sequence transformer above the base.

[0003] Since the zero-sequence transformer itself has a certain thickness (the dimension in the axial direction of the center hole), the base also needs to have a certain reserved space for installing the zero-sequence transformer, so the assembly of the zero-sequence transformer will inevitably occupy a part of the space in the length direction of the base, resulting in the length dimension of the leakage circuit breaker of the above structure being difficult to reduce.

[0004] Therefore, it is also necessary to rearrange the zero-sequence transformer to reduce the length dimension of the circuit breaker as much as possible. Summary of the invention

[0005] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a leakage circuit breaker.

[0006] The present application provides: a leakage circuit breaker, which includes a base and a zero-sequence transformer, wherein at least two-pole main circuit spaces are arranged on the front of the base, and a main circuit conductor is arranged in each pole main circuit space; wherein a transformer accommodating groove is opened on the back of the base, the zero-sequence transformer is located in the transformer accommodating groove, the center hole of the zero-sequence transformer faces the height direction of the base, and the main circuit conductors of each pole pass through the center hole of the zero-sequence transformer.

[0007] In some embodiments of the present application, the axis of the center hole of the zero-sequence transformer is parallel to the height direction of the base.

[0008] In some embodiments of the present application, the axis of the central hole of the zero-sequence transformer is arranged at an angle A with respect to the height direction of the base, and the angle is 10°>A>0°.

[0009] In some embodiments of the present application, the number of main loop spaces and main loop conductors are both three-pole, the three-pole main loop conductors are all live poles, the part of the main loop conductor that passes through the center hole of the zero-sequence transformer is the passing section, and all the main loop conductors except the passing section are the same.

[0010] In some embodiments of the present application, the number of main loop spaces and main loop conductors are both four poles, among which three-pole main loop conductors are all live poles, and the other pole is an N pole. The part of the main loop conductor that passes through the center hole of the zero-sequence transformer is the passing section, and all the main loop conductors except the passing section are the same.

[0011] In some embodiments of the present application, the number of main loop spaces and main loop conductors are both four poles, among which three-pole main loop conductors are live poles, and the other pole is an N pole, which directly passes through the center hole of the zero-sequence transformer.

[0012] In some embodiments of the present application, the portion of the main circuit conductor that passes through the central hole of the zero-sequence transformer is a passing section, and the passing section is a soft link or a hard busbar.

[0013] In some embodiments of the present application, the main circuit conductor further includes a moving contact and a protection component, the protection component includes a first conductive bar, one end of the penetration segment is electrically connected to the moving contact, and the other end is electrically connected to the first conductive bar.

[0014] In some embodiments of the present application, the main circuit conductor also includes a second conductive bar, the second conductive bar is located in the transformer accommodating slot, the first conductive bar and the second conductive bar are fastened by fasteners, and the electrical connection between the penetration section and the first conductive bar is realized through the second conductive bar.

[0015] In some embodiments of the present application, a mounting groove is provided on the bottom of the transformer receiving groove, and the second conductive bar is at least partially located in the mounting groove.

[0016] In some embodiments of the present application, a limiting rib is provided in the transformer accommodating groove, and the limiting rib is provided on the groove bottom and / or groove wall of the transformer accommodating groove, and is used to limit the zero-sequence transformer.

[0017] In some embodiments of the present application, a limiting rib is provided in the transformer accommodating groove, and the limiting rib limits the periphery of the zero-sequence transformer and / or the limiting rib limits the wall of the center hole of the zero-sequence transformer.

[0018] In some embodiments of the present application, a cover is further included, which is fixed to the back of the base and is used to close the notch of the transformer accommodating slot.

[0019] In some embodiments of the present application, the main circuit space is sequentially composed of a first terminal cavity, an arc extinguishing cavity, a rotating shaft installation cavity, a protection component installation cavity and a second terminal cavity along the length direction of the base; in the height direction of the base, the rotating shaft installation cavity and / or the protection component installation cavity are located above the transformer accommodating slot.

[0020] In some embodiments of the present application, a thermal magnetic release is installed in the protection component installation cavity.

[0021] In some embodiments of the present application, a backup protector and a protection transformer are installed in the protection component installation cavity.

[0022] In some embodiments of the present application, the bottom of the arc extinguishing chamber is located on one side of the transformer accommodating slot.

[0023] As can be seen from the above, the technical solution of the present application is to open a transformer accommodating groove on the back of the base, so that the zero-sequence transformer can be installed in the transformer accommodating groove, and at the same time, the center hole of the zero-sequence transformer is facing the height direction of the base, which is equivalent to using the space in the height of the base to accommodate the zero-sequence transformer, which can reduce the size in the length direction. Such a setting method can also keep the zero-sequence transformer away from the moving contact, arc extinguishing chamber and other areas on the front of the base, which can reduce the possibility of the zero-sequence transformer being damaged by arc and hot air flow impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the structure of a leakage circuit breaker according to an embodiment of the present application is shown;

[0026] Figure 2 A schematic diagram and a partial enlarged diagram of the residual current circuit breaker after the cover is removed according to the embodiment of the present application are shown;

[0027] Figure 3 A schematic diagram of the structure of a base in a residual current circuit breaker in an embodiment of the present application is shown;

[0028] Figure 4 A cross-sectional view of a base in a residual current circuit breaker according to an embodiment of the present application is shown;

[0029] Figure 5 A schematic diagram showing an implementation of a base and a zero-sequence mutual inductor in a residual current circuit breaker in an embodiment of the present application;

[0030] Figure 6 A schematic diagram showing another implementation of a base and a zero-sequence mutual inductor in a residual current circuit breaker in an embodiment of the present application;

[0031] Figure 7 A schematic diagram of a main circuit conductor of one pole in a residual current circuit breaker according to an embodiment of the present application is shown;

[0032] Figure 8A schematic diagram of a main circuit conductor and a zero-sequence mutual inductor in a residual current circuit breaker according to an embodiment of the present application is shown;

[0033] Fig. 9 An implementation method of the zero-sequence mutual inductor and the limit rib in the residual current circuit breaker of the embodiment of the present application is shown;

[0034] Fig.10 Another implementation method of the zero-sequence mutual inductor and the limiting rib in the residual current circuit breaker of the embodiment of the present application is shown;

[0035] Fig.11 Another implementation method of the zero-sequence mutual inductor and the limiting rib in the residual current circuit breaker of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more poles of the feature. In the description of this application, "multi-pole" means two or more poles, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "electrically connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed electrical connection, a detachable electrical connection, or an integrated one; it can be a mechanical electrical connection, or an electrical electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of the two-pole element or the interaction relationship between the two-pole elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0041] like Figure 1-11 As shown, a leakage circuit breaker, which can also be called a residual current operated protection circuit breaker.

[0042] The circuit breaker includes a base 10 , a zero-sequence transformer 20 , a main circuit conductor 30 and a cover 40 .

[0043] The base 10 has three main circuit spaces S1 arranged in sequence on the front side of the base 10 along its width direction. The main circuit spaces S1 are used to install the main circuit conductor 30 .

[0044] The main circuit space S1 is divided into the first terminal cavity S11, the arc extinguishing cavity S12, the shaft installation cavity S13, the protection component installation cavity S14 and the second terminal cavity S15 in sequence along its length direction. Here, the first terminal cavity S11 is used to install the first terminal row 31 (a part of the main circuit conductor 30), the arc extinguishing cavity S12 is used to install the static contact 32 (a part of the main circuit conductor 30) and the arc extinguishing chamber, the shaft installation cavity S13 is used to install the shaft and the moving contact 33 (a part of the main circuit conductor 30), the protection component installation cavity S14 is used to install the thermal magnetic release (the first conductive row 36 in the thermal magnetic release is also a part of the main circuit conductor 30), and the second terminal cavity S15 is used to install the second terminal row 37 (a part of the main circuit conductor 30).

[0045] The main circuit conductor 30, in this embodiment, is a P-pole and is not a complete conductor. It includes a first terminal row 31, a stationary contact 32, a moving contact 33, a penetration section 34, a second conductive row 35, a first conductive row 36, and a second terminal row 37. In this embodiment, the three-pole main circuit conductor 30 is the same except for the penetration section 34.

[0046] A transformer accommodating slot S16 is provided on the back of the base 10, and the zero-sequence transformer 20 is installed in the transformer accommodating slot S16. The center hole of the zero-sequence transformer 20 is oriented toward the height direction H of the base, and all the penetration sections 34 pass through the center hole of the zero-sequence transformer 20. As can be seen from the accompanying drawings, the bottom of the arc extinguishing cavity S12 is located on the left side of the transformer accommodating slot S16. Such a setting can make the overall height space of the arc extinguishing cavity S12 larger, which will be conducive to setting more arc extinguishing grids and improving the arc extinguishing performance of the product.

[0047] The cover 40 is fixed to the back of the base 10, and is fixed by screws. The cover is used to close the notch of the transformer receiving slot S16. Of course, in addition to fixing with screws, other methods such as gluing, snapping, etc. can also be used for fixing.

[0048] Here, the so-called center hole of the zero-sequence transformer 20 is facing the height direction H of the base, which does not specifically mean that the axis L of the center hole of the zero-sequence transformer 20 is parallel to the height direction H of the base, but includes both the situation that the axis L is parallel to the height direction H and the situation that the axis L is at an angle A to the height direction H. If the angle A setting is adopted, the value of the angle A is generally 10°>A>0°. Adopting such a setting is equivalent to placing the zero-sequence transformer 20 flat in the transformer accommodation slot S16 of the base 10, which can reduce the occupation of the space in the length direction of the base, which is conducive to reducing the size of the base in the length direction.

[0049] Here, all the penetration sections 34 adopt a soft connection structure, that is, one end of the penetration section 34 is welded to the moving contact 33, and the other end is welded to the second conductive bar 35, and the second conductive bar 35 is fixed to the first conductive bar 36 by a fastener (here the fastener is a bolt). Here, it is also feasible to adopt a hard busbar for the penetration section 34. Although the second conductive bar 35 is included in this embodiment, the second conductive bar 35 can also be omitted, for example, the other end of the penetration section 34 is directly electrically connected to the first conductive bar 36.

[0050] From the height direction H of the base, the transformer accommodating groove S16 is just located below the shaft installation cavity S13 and the protection component installation cavity S14. Of course, the transformer accommodating groove S16 is associated with the size of the actual zero-sequence transformer 20. For example, when a smaller zero-sequence transformer 20 is selected, the size of the transformer accommodating groove S16 can also be reduced to be located only below the shaft installation cavity S13 or only below the protection component installation cavity S14.

[0051] The bottom of the transformer receiving slot S16 is provided with a mounting slot, and the second conductive bar 35 is just located in the mounting slot. Such a mounting slot design will facilitate the positioning and assembly of the second conductive bar 35 and the first conductive bar 36 .

[0052] In order to facilitate the limiting of the zero-sequence transformer 20, limiting ribs are provided in the transformer accommodating slot S16. The limiting ribs here can be used to limit the periphery of the zero-sequence transformer 20, or to limit the center hole of the zero-sequence transformer 20, or to limit the periphery and the center hole of the zero-sequence transformer 20 at the same time.

[0053] As a limiting implementation method, Fig. 9 As shown, in this mode, the limiting ribs use three second limiting ribs 100, which offset the three positions around the zero-sequence transformer 20, so as to ensure that the zero-sequence transformer 20 is installed at the predetermined position. Here, the second limiting ribs 100 extend from the bottom and the wall of the transformer accommodating groove S16. Of course, the second limiting ribs 100 can also extend only from the bottom of the groove, or only from the groove wall.

[0054] As another implementation method of limiting, Fig.10 As shown, in this manner, the limiting rib is a first limiting rib 101 , which extends from the bottom of the slot and abuts against the hole wall of the center hole of the zero-sequence transformer 20 .

[0055] As another embodiment of limiting the position, Fig.11 As shown, in this manner, the limiting ribs include a first limiting rib 101 and a second limiting rib 100 , the second limiting rib 100 abuts against the hole wall of the center hole of the zero-sequence transformer 20 , and the first limiting rib 101 abuts against the periphery of the zero-sequence transformer 20 .

[0056] Although the above embodiment uses a 3P leakage protection circuit breaker as an example, it can also be applied to a 3P+N leakage protection circuit breaker. According to the different settings of the N-pole main circuit conductor 30, it can be divided into an N-pole straight-through type and an N-pole separable type. Taking the N-pole straight-through type as an example, the N-pole main circuit conductor 30 is a whole section of conductor that directly penetrates the center hole of the zero-sequence transformer 20. Taking the N-pole separable type as an example, the structure of its N-pole main circuit conductor 30 refers to the above-mentioned P-pole, and the center hole of the zero-sequence transformer 20 is also penetrated by the penetration section 34 of the N-pole main circuit conductor 30.

[0057] In addition, although the above examples are thermal magnetic leakage circuit breakers, they can also be used in electronic leakage circuit breakers. When used in electronic leakage circuit breakers, the protection component installation cavity S14 will no longer be installed with a thermal magnetic release, but will be used to install a mutual inductor and a backup protector.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0059] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A leakage circuit breaker, comprising a base and a zero-sequence mutual inductor, wherein at least two-pole main circuit spaces are arranged on the front of the base, and a main circuit conductor is arranged in each pole main circuit space; characterized in that: A transformer accommodating slot is provided on the back of the base, the zero-sequence transformer is located in the transformer accommodating slot, the center hole of the zero-sequence transformer faces the height direction of the base, and the main circuit conductors of each pole pass through the center hole of the zero-sequence transformer.

2. A leakage circuit breaker according to claim 1, characterized in that: The axis of the center hole of the zero-sequence transformer is parallel to the height direction of the base; Alternatively, the axis of the central hole of the zero-sequence transformer is arranged at an angle A with respect to the height direction of the base, and the angle is 10°>A>0°.

3. A leakage circuit breaker according to claim 1, characterized in that: The number of main circuit spaces and main circuit conductors are all three-pole, and the three-pole main circuit conductors are all live poles. The part of the main circuit conductor that passes through the center hole of the zero-sequence transformer is the passing section, and all the main circuit conductors except the passing section are the same; Or, the number of main circuit spaces and main circuit conductors are both four-pole, among which three-pole main circuit conductors are live poles, and the other pole is an N pole, and the portion of the main circuit conductor that passes through the center hole of the zero-sequence transformer is a passing section, and all the main circuit conductors except the passing section are the same; Alternatively, the number of main circuit spaces and main circuit conductors are both four-pole, among which three-pole main circuit conductors are live poles, and the other pole is an N pole, and the N pole directly passes through the center hole of the zero-sequence transformer.

4. A leakage circuit breaker according to claim 1, characterized in that: The portion of the main circuit conductor that passes through the center hole of the zero-sequence transformer is a passing section, and the passing section is a soft connection or a hard busbar; and / or, it also includes a cover, which is fixed to the back of the base and is used to close the notch of the transformer accommodating slot.

5. A leakage circuit breaker according to claim 4, characterized in that: The main circuit conductor also includes a moving contact and a protection component. The protection component includes a first conductive bar. One end of the penetration section is electrically connected to the moving contact, and the other end is electrically connected to the first conductive bar.

6. A leakage circuit breaker according to claim 5, characterized in that: The main circuit conductor also includes a second conductive bar, which is located in the transformer accommodating slot. The first conductive bar and the second conductive bar are fastened by fasteners, and the electrical connection between the penetration section and the first conductive bar is achieved through the second conductive bar.

7. A leakage circuit breaker according to claim 6, characterized in that: A mounting groove is provided on the groove bottom of the transformer accommodating groove, and at least a part of the second conductive bar is located in the mounting groove.

8. The residual current circuit breaker according to claim 1, characterized in that: A limiting rib is arranged in the transformer accommodating groove, and the limiting rib is arranged on the groove bottom and / or groove wall of the transformer accommodating groove, and is used to limit the zero-sequence transformer; Alternatively, a limiting rib is provided in the transformer accommodating groove, and the limiting rib limits the periphery of the zero-sequence transformer and / or the limiting rib limits the wall of the central hole of the zero-sequence transformer.

9. A residual current circuit breaker according to claim 1, characterized in that: The main circuit space is composed of a first terminal cavity, an arc extinguishing cavity, a rotating shaft installation cavity, a protection component installation cavity and a second terminal cavity in sequence along the length direction of the base; in the height direction of the base, the rotating shaft installation cavity and / or the protection component installation cavity are located above the transformer accommodating groove.

10. A residual current circuit breaker according to claim 9, characterized in that: A thermal magnetic release is installed in the protection component installation cavity; Or, a backup protector and a protection transformer are installed in the protection component installation cavity; Alternatively, the bottom of the arc extinguishing chamber is located on one side of the transformer accommodating slot.

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