A zero-sequence mutual inductance structure and a circuit breaker

Abstract

The present invention provides a zero-sequence mutual inductance structure and a circuit breaker, relating to the technical field of leakage protection. The zero-sequence mutual inductance structure includes a current transformer and a phase wire group; the current transformer includes a housing and a magnetic ring, an interphase isolation member is arranged on the housing, a first channel, a second channel and a third channel are arranged on the interphase isolation member, and the magnetic ring is arranged around the interphase isolation member; the phase wire group includes an A-phase wiring board, an A-phase contact, a B-phase contact, a C-phase wiring board and a C-phase contact, the A-phase wiring board or the A-phase contact penetrates through the first channel, the A-phase wiring board is connected with the A-phase contact, the B-phase contact penetrates through the second channel, the C-phase wiring board or the C-phase contact penetrates through the third channel, and the C-phase wiring board is connected with the C-phase contact. The above zero-sequence mutual inductance structure separates each phase wire by arranging an interphase isolation member on the housing, has a longer creepage distance and better insulation performance, can meet the insulation requirements under the working conditions of high voltage and large current, and eliminates potential safety hazards.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage protection, and in particular to a zero-sequence mutual inductance structure and a circuit breaker. Background Art

[0002] When the phasor sum of three-phase currents is not equal to zero, the generated current is the zero-sequence current, that is, the leakage current. In order to detect the zero-sequence current, a common method is to connect a current transformer in a three-phase circuit, pass the phase wires through the magnetic ring of the current transformer, and then detect whether there is an induced current in the secondary coil of the current transformer.

[0003] However, when the three phase wires pass through the magnetic ring, the distance between them is very close, and the insulation between phases is poor. Although phase isolation can be achieved by winding insulating tape on the phase wires or adding insulating inserts between the phase wires, phase conduction may still occur under high-voltage and high-current working conditions, posing a safety hazard. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, one of the objectives of the present invention is to provide a zero-sequence mutual inductance structure.

[0005] The present invention provides the following technical solutions:

[0006] A zero-sequence mutual inductance structure includes a current transformer and a set of phase wires;

[0007] The current transformer includes a housing and a magnetic ring. An inter-phase isolation member is provided on the housing. The inter-phase isolation member is provided with a first channel, a second channel, and a third channel. The magnetic ring is disposed around the inter-phase isolation member;

[0008] The set of phase wires includes an A-phase connection board, an A-phase contact, a B-phase contact, a C-phase connection board, and a C-phase contact. The A-phase connection board or the A-phase contact passes through the first channel. The A-phase connection board is connected to the A-phase contact. The B-phase contact passes through the second channel. The C-phase connection board or the C-phase contact passes through the third channel. The C-phase connection board is connected to the C-phase contact.

[0009] As a further optional solution to the zero-sequence mutual inductance structure, the A-phase connection board or the A-phase contact includes a first connection portion. The A-phase connection board and the A-phase contact are connected through the first connection portion. The first connection portion is located in the first channel;

[0010] The C-phase connection board or the C-phase contact includes a second connection portion. The C-phase connection board and the C-phase contact are connected through the second connection portion. The second connection portion is located in the third channel.

[0011] As a further optional solution to the zero-sequence mutual inductance structure, the A-phase wiring board includes the first connecting portion, the first sensing portion, the first bending portion and the first wiring portion connected in sequence, and the C-phase wiring board includes the second connecting portion, the second sensing portion, the second bending portion and the second wiring portion connected in sequence;

[0012] The first sensing portion is disposed in the first channel, the second sensing portion is disposed in the second channel, and the first bending portion and the second bending portion are extended in directions away from each other.

[0013] As a further optional solution for the zero-sequence mutual inductance structure, the width of the first wiring portion is greater than the width of the first inductive portion, and the width of the second wiring portion is greater than the width of the second inductive portion.

[0014] As a further optional solution to the zero-sequence mutual inductance structure, the A-phase contact includes a third connecting portion and a first contact portion connected to each other, and the C-phase contact includes a fourth connecting portion and a second contact portion connected to each other;

[0015] Among them, the third connection part and the fourth connection part are extended in directions diverging from each other, one end of the third connection part facing the fourth connection part is connected to the first connection part, and the other end is connected to the first contact part, and one end of the fourth connection part facing the third connection part is connected to the second connection part, and the other end is connected to the second contact part.

[0016] As a further optional solution to the zero-sequence mutual inductance structure, the current transformer further includes a middle cover, which is arranged on a side of the casing away from the magnetic ring, and the middle cover and the casing are enclosed to form a first chamber and a second chamber;

[0017] The first chamber is in communication with the first channel, and one end of the third connection portion facing the fourth connection portion is located in the first chamber;

[0018] The second chamber is communicated with the third channel, and one end of the fourth connection portion facing the third connection portion is located in the second chamber.

[0019] As a further optional solution for the zero-sequence mutual inductance structure, the zero-sequence mutual inductance structure further includes a temperature detection component, and the temperature detection component is arranged on the phase-to-phase isolation component.

[0020] As a further optional solution to the zero-sequence mutual inductance structure, a wiring groove is provided on the cover; and / or

[0021] A wire buckle is arranged on the cover shell.

[0022] As a further optional solution for the zero-sequence mutual inductance structure, the phase-interphase isolator includes a first insulating portion, a second insulating portion, a third insulating portion, and a fourth insulating portion;

[0023] The first insulating portion is annularly arranged, and the magnetic ring is arranged around the first insulating portion;

[0024] The second insulating portion, the third insulating portion, and the fourth insulating portion are all located inside the first insulating portion. One ends of the second insulating portion, the third insulating portion, and the fourth insulating portion are connected to each other, and the other ends of the second insulating portion, the third insulating portion, and the fourth insulating portion are respectively connected to the first insulating portion;

[0025] Wherein, the first insulating portion, the second insulating portion, and the third insulating portion enclose to form the first channel, the first insulating portion, the third insulating portion, and the fourth insulating portion enclose to form the second channel, and the first insulating portion, the second insulating portion, and the fourth insulating portion enclose to form the third channel.

[0026] Another object of the present invention is to provide a circuit breaker.

[0027] The present invention provides the following technical solutions:

[0028] A circuit breaker includes the above zero-sequence mutual inductance structure.

[0029] The embodiments of the present invention have the following beneficial effects:

[0030] In the above zero-sequence mutual inductance structure, the phase-interphase isolator on the housing is provided with a first channel, a second channel, and a third channel. Correspondingly, the phase A wiring board or the phase A contact is disposed through the first channel, the phase B contact is disposed through the second channel, and the phase C wiring board or the phase C contact is disposed through the third channel. Thus, each phase line is separated by the integrally designed phase-interphase isolator, with a longer creepage distance and better insulation performance, which can meet the insulation requirements under the working conditions of high voltage and large current, and eliminate potential safety hazards. On this basis, in order to be adapted to the integrally designed phase-interphase isolator, the phase A line and the phase C line on both sides are both designed in a split manner, and are respectively split into a phase A wiring board and a phase A contact, a phase C wiring board and a phase C contact, so as to pass through the middle of the magnetic ring of the current transformer, and then complete the assembly.

[0031] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related accompanying drawings can also be obtained based on these drawings.

[0033] Figure 1 Shows the overall structural schematic diagram of a zero-sequence mutual inductance structure provided by an embodiment of the present invention;

[0034] Figure 2 Shows the structural schematic diagram of a zero-sequence mutual inductance structure provided by an embodiment of the present invention from another perspective;

[0035] Figure 3 Shows the structural schematic diagram of the housing and the phase-to-phase spacer in a zero-sequence mutual inductance structure provided by an embodiment of the present invention;

[0036] Figure 4 Shows the structural schematic diagram of the housing and the phase-to-phase spacer in a zero-sequence mutual inductance structure provided by an embodiment of the present invention from another perspective;

[0037] Figure 5 Shows the structural schematic diagram of the phase wire group in a zero-sequence mutual inductance structure provided by an embodiment of the present invention;

[0038] Figure 6 Shows the schematic diagram of the cooperation relationship between the housing and the middle cover in a zero-sequence mutual inductance structure provided by an embodiment of the present invention;

[0039] Figure 7 Shows the internal structural schematic diagram of a zero-sequence mutual inductance structure provided by an embodiment of the present invention;

[0040] Figure 8 Shows the overall structural schematic diagram of a circuit breaker provided by an embodiment of the present invention.

[0041] Main element symbol description:

[0042] 10 - Zero - sequence mutual inductance structure; 100 - Current transformer; 110 - Housing; 111 - Wiring groove; 112 - Wire clip; 113 - Receiving groove; 120 - Magnetic ring; 130 - Phase - to - phase separator; 131 - First channel; 132 - Second channel; 133 - Third channel; 134 - First insulating part; 135 - Second insulating part; 1351 - Groove; 136 - Third insulating part; 137 - Fourth insulating part; 140 - Middle cover; 141 - First chamber; 142 - Second chamber; 200 - Phase - wire group; 210 - Phase - A terminal board; 211 - First connecting part; 212 - First induction part; 213 - First bending part; 214 - First wiring part; 220 - Phase - A contact; 221 - Third connecting part; 222 - First contact head; 230 - Phase - B contact; 231 - Third wiring part; 232 - Third contact head; 240 - Phase - C terminal board; 241 - Second connecting part; 242 - Second induction part; 243 - Second bending part; 244 - Second wiring part; 250 - Phase - C contact; 251 - Fourth connecting part; 252 - Second contact head; 300 - Temperature detector. Detailed implementation manners

[0043] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0045] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the description of the template herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0048] Those skilled in the art of this application have found that in the related art, when the three phase lines pass through the magnetic ring 120 of the current transformer 100, the distance between them is very close, and the phase insulation is poor. When performing phase isolation by winding insulating tape on the phase lines or adding insulating inserts between the phase lines, the operation steps are complex, and there may still be a situation of phase conduction under high voltage and large current conditions, posing a safety hazard.

[0049] In addition, limited by the size of the current transformer 100, the A-phase line and the C-phase line on both sides need to be bent towards the B-phase line in the middle so that the three phase lines occupy less space when passing through the magnetic ring 120. However, there is a problem that it is relatively difficult for the bent A-phase line and C-phase line to pass through the core. During the core-passing process, the position and angle need to be adjusted multiple times so that each bent part of the A-phase line and C-phase line passes through the magnetic ring 120 successively. At the same time, the size of the connection terminals of the A-phase line and C-phase line is limited by the inner circumference size of the magnetic ring 120, otherwise the core-passing cannot be completed, which results in a narrow connection interface and a high connection temperature of the A-phase line and C-phase line, being unfavorable for the long-term stable operation of the device.

[0050] Please refer to Figure 1 and Figure 2 simultaneously. To address the above problems, this embodiment provides a zero-sequence mutual inductance structure 10, including a current transformer 100 and a phase line group 200.

[0051] Among them, the current transformer 100 includes a housing 110 and a magnetic ring 120. An interphase isolation member 130 is provided on the housing 110, and a first channel 131, a second channel 132, and a third channel 133 are provided on the interphase isolation member 130. Correspondingly, the magnetic ring 120 is disposed around the interphase isolation member 130.

[0052] In addition, the phase line group 200 includes an A-phase wiring board 210, an A-phase contact 220, a B-phase contact 230, a C-phase wiring board 240, and a C-phase contact 250. The A-phase wiring board 210 or the A-phase contact 220 is inserted through the first channel 131, and the A-phase wiring board 210 is connected to the A-phase contact 220. The B-phase contact 230 is inserted through the second channel 132. The C-phase wiring board 240 or the C-phase contact 250 is inserted through the third channel 133, and the C-phase wiring board 240 is connected to the C-phase contact 250.

[0053] In the above zero-sequence mutual inductance structure 10, the phase-interphase isolation member 130 on the housing 110 is provided with a first channel 131, a second channel 132, and a third channel 133. Correspondingly, the A-phase wiring board 210 or the A-phase contact 220 is inserted through the first channel 131, the B-phase contact 230 is inserted through the second channel 132, and the C-phase wiring board 240 or the C-phase contact 250 is inserted through the third channel 133. Thus, each phase line is separated by the integrally designed phase-interphase isolation member 130, with a longer creepage distance and better insulation performance, capable of meeting the insulation requirements under high-voltage and large-current working conditions and eliminating potential safety hazards.

[0054] On this basis, in order to be adapted to the integrally designed phase-interphase isolation member 130, the A-phase line and the C-phase line on both sides are both designed in a split manner, respectively split into the A-phase wiring board 210 and the A-phase contact 220, the C-phase wiring board 240 and the C-phase contact 250, so as to pass through the middle of the magnetic ring 120 of the current transformer 100, and then complete the assembly.

[0055] On the one hand, the A-phase wiring board 210 and the A-phase contact 220 can be inserted and connected from the front and rear sides of the housing 110 along the first direction (schematically shown as the X direction in the figure), and only need to align one end where they are connected with the first channel 131; the C-phase wiring board 240 and the C-phase contact 250 can be inserted and connected from the front and rear sides of the housing 110 along the first direction, and only need to align one end where they are connected with the third channel 133. It can avoid the problem of difficult core penetration of the integrally bent A-phase line and C-phase line.

[0056] On the other hand, one end of the A-phase wiring board 210 away from the A-phase contact 220 serves as the outgoing line end of the A-phase line and does not need to pass through the first channel 131; one end of the C-phase wiring board 240 away from the C-phase contact 250 serves as the outgoing line end of the C-phase line and does not need to pass through the third channel 133. Therefore, a larger size design can be adopted to obtain a wider wiring interface, thereby achieving a lower wiring temperature rise.

[0057] Please refer to Figure 3 and Figure 4 In some embodiments, the phase-interphase isolation member 130 is composed of a first insulating portion 134, a second insulating portion 135, a third insulating portion 136, and a fourth insulating portion 137.

[0058] Specifically, the first insulating portion 134 is annularly arranged, and the magnetic ring 120 is arranged around the first insulating portion 134.

[0059] The second insulating portion 135, the third insulating portion 136, and the fourth insulating portion 137 are all located inside the first insulating portion 134. One ends of the second insulating portion 135, the third insulating portion 136, and the fourth insulating portion 137 are connected to each other, and the other ends of the second insulating portion 135, the third insulating portion 136, and the fourth insulating portion 137 are respectively connected to the first insulating portion 134.

[0060] Among them, the first insulating portion 134, the second insulating portion 135, and the third insulating portion 136 enclose to form a first channel 131; the first insulating portion 134, the third insulating portion 136, and the fourth insulating portion 137 enclose to form a second channel 132; the first insulating portion 134, the second insulating portion 135, and the fourth insulating portion 137 enclose to form a third channel 133.

[0061] In addition, the first channel 131, the second channel 132, and the third channel 133 are all arranged to extend along the first direction.

[0062] Exemplarily, the main body portion of the housing 110, the first insulating portion 134, the second insulating portion 135, the third insulating portion 136, and the fourth insulating portion 137 are integrally injection-molded.

[0063] Please refer to Figure 5 , in some embodiments, the A-phase wiring board 210 or the A-phase contact 220 includes a first connecting portion 211. The A-phase wiring board 210 and the A-phase contact 220 are connected through the first connecting portion 211, and the first connecting portion 211 is located in the first channel 131.

[0064] It can be understood that the A-phase wiring board 210 and the A-phase contact 220 are usually made of copper bars, and the thickness of the copper bars is generally 2.5 - 6 mm. When the A-phase wiring board 210 and the A-phase contact 220 are connected through the first connecting portion 211, the copper bar serving as the A-phase wiring board 210 and the copper bar serving as the A-phase contact 220 are stacked together, and then bolted or welded and fixed. Along the first direction, the space occupied by the two stacked copper bars is large. Since the first connecting portion 211 is located in the first channel 131, the size of the current transformer 100 itself along the first direction can be fully utilized, avoiding the situation that the size of the device along the first direction increases due to the split design of the A-phase line, which is beneficial to adjusting parameters such as the size of the current transformer 100 along the first direction under a given size and optimizing the device characteristics.

[0065] Similarly, the phase C terminal block 240 or the phase C contact 250 includes a second connection portion 241. The phase C terminal block 240 and the phase C contact 250 are connected through the second connection portion 241, and the second connection portion 241 is located in the third channel 133.

[0066] Specifically, the phase A terminal block 210 includes a first connection portion 211, a first induction portion 212, a first bending portion 213, and a first wiring portion 214 that are connected in sequence.

[0067] Among them, the first induction portion 212 extends along the first direction and passes through the first channel 131. The first connection portion 211 is connected to one end of the first induction portion 212 close to the phase A contact 220, the first bending portion 213 is connected to the other end of the first induction portion 212 far from the phase A contact 220, and both the first connection portion 211 and the first bending portion 213 are perpendicular to the first direction.

[0068] Similarly, the phase C terminal block 240 includes a second connection portion 241, a second induction portion 242, a second bending portion 243, and a second wiring portion 244 that are connected in sequence.

[0069] Among them, the second induction portion 242 extends along the second direction and passes through the third channel 133. The second connection portion 241 is connected to one end of the second induction portion 242 close to the phase C contact 250, the second bending portion 243 is connected to the other end of the second induction portion 242 far from the phase C contact 250, and both the second connection portion 241 and the second bending portion 243 are perpendicular to the first direction.

[0070] In addition, the first bending portion 213 and the second bending portion 243 extend in opposite directions, specifically along the second direction, which is indicated by the Y direction in the figure. One end of the first bending portion 213 facing the second bending portion 243 is connected to the first induction portion 212, and the other end is connected to the first wiring portion 214. One end of the second bending portion 243 facing the first bending portion 213 is connected to the second induction portion 242, and the other end is connected to the second wiring portion 244.

[0071] During use, the magnetic ring 120 surrounds the peripheries of the first induction portion 212, the second induction portion 242, and the phase B contact 230. When the vector sum of the currents in the first induction portion 212, the second induction portion 242, and the phase B contact 230 is not zero, the generated zero-sequence current excites an induced magnetic field, and then an induced current is generated in the secondary winding of the current transformer 100 to monitor the circuit where the phase wire group 200 is located.

[0072] Furthermore, the width of the first wiring portion 214 is greater than the width of the first induction portion 212, and the width of the second wiring portion 244 is greater than the width of the second induction portion 242.

[0073] Understandably, the width of the first induction part 212 is limited by the cross-sectional size of the first channel 131. When the A-phase wire adopts a split design, the first connection part 214 does not need to pass through the first channel 131. Therefore, the width of the first connection part 214 can be made larger to obtain a wider connection interface, thereby achieving a lower connection temperature rise.

[0074] Similarly, the width of the second induction part 242 is limited by the cross-sectional size of the third channel 133. When the C-phase wire adopts a split design, the second connection part 244 does not need to pass through the third channel 133. Therefore, the width of the second connection part 244 can be made larger to obtain a wider connection interface, and a lower connection temperature rise can also be achieved.

[0075] Specifically, the A-phase contact 220 includes a third connection part 221 and a first contact part 222 that are connected to each other, and the C-phase contact 250 includes a fourth connection part 251 and a second contact part 252 that are connected to each other.

[0076] Among them, the third connection part 221 and the fourth connection part 251 extend in opposite directions, specifically extending in the second direction. One end of the third connection part 221 facing the fourth connection part 251 is connected to the first connection part 211, and the other end is connected to the first contact part 222. One end of the fourth connection part 251 facing the third connection part 221 is connected to the second connection part 241, and the other end is connected to the second contact part 252.

[0077] Understandably, one end of the third connection part 221 facing the fourth connection part 251 is perpendicular to the first direction and is located at the opening of the first channel 131. The first connection part 211 is located at the end of the first channel 131 facing the A-phase contact 220 and is connected after being stacked with the third connection part 221.

[0078] Similarly, one end of the fourth connection part 251 facing the third connection part 221 is perpendicular to the first direction and is located at the opening of the third channel 133. The second connection part 241 is located at the end of the third channel 133 facing the C-phase contact 250 and is connected after being stacked with the fourth connection part 251.

[0079] Please refer to Figure 6 and Figure 7 , further, the current transformer 100 further includes a middle cover 140. The middle cover 140 is disposed on the side of the housing 110 facing away from the magnetic ring 120, and the middle cover 140 and the housing 110 enclose a first chamber 141 and a second chamber 142.

[0080] Among them, the first chamber 141 is communicated with the first channel 131, and one end of the third connection part 221 facing the fourth connection part 251 is located in the first chamber 141.

[0081] The second chamber 142 communicates with the third channel 133, and one end of the fourth connecting portion 251 facing the third connecting portion 221 is located within the second chamber 142.

[0082] The middle cover 140 cooperates with the housing 110 to isolate the third connecting portion 221 within the first chamber 141, isolate the fourth connecting portion 251 within the second chamber 142, and at the same time isolate the B-phase contact 230 from the outside, which can better achieve phase isolation, maintain the rear-end sealing of each pole cavity, and is beneficial to improving the breaking capacity of the device.

[0083] Exemplarily, the middle cover 140 and the housing 110 are integrally injection-molded.

[0084] Please refer back to Figure 5 In some embodiments, the B-phase contact 230 includes a third wiring portion 231 and a third contact portion 232.

[0085] Among them, the first wiring portion 214, the third wiring portion 231, and the second wiring portion 244 are arranged in sequence along the second direction and serve as the three outgoing terminals of the phase wire group 200. The first contact portion 222, the third contact portion 232, and the second contact portion 252 are arranged in sequence along the second direction and serve as the three incoming terminals of the phase wire group 200.

[0086] Please refer back to Figure 1 In some embodiments, considering that the split-designed A-phase wire and C-phase wire may have poor contact at the connection, resulting in a larger resistance and more heat generation at the connection, which may further cause the housing 110 to melt. To this end, the above zero-sequence mutual inductance structure 10 further includes a temperature detection member 300, and the temperature detection member 300 is disposed on the phase isolation member 130.

[0087] During use, the temperature detection member 300 disposed on the phase isolation member 130 is adjacent to the first connecting portion 211, the second connecting portion 241, the third connecting portion 221, and the fourth connecting portion 251. When there is a significant temperature rise due to a large resistance at the connection between the first connecting portion 211 and the third connecting portion 221 and at the connection between the second connecting portion 241 and the fourth connecting portion 251, the temperature detection member 300 can detect it in time, so that the control module of the device can break the circuit in time when the temperature exceeds the preset value to prevent the device from burning out.

[0088] Please refer to Figure 3 Exemplarily, a groove 1351 is provided on the second insulating portion 135. The temperature detection member 300 uses a temperature sensing probe, and the temperature sensing probe is embedded in the groove 1351.

[0089] Please refer back to Figure 3 and Figure 4 In some embodiments, a wiring groove 111 is provided on the housing 110; and / or a wire buckle 112 is provided on the housing 110.

[0090] In use, the housing 110 provided with the wiring groove 111 and / or the wire buckle 112 can bundle the cables in the current transformer 100, and the housing 110 is used to achieve regular wire arrangement.

[0091] Specifically, a receiving groove 113 is provided on one side of the housing 110 facing the magnetic ring 120. The receiving groove 113 is arranged around the phase separation spacer 130, and the magnetic ring 120 is embedded in the receiving groove 113. At the same time, the wiring groove 111 is arranged on the periphery of the receiving groove 113 and communicates with the receiving groove 113.

[0092] In addition, a plurality of wire buckles 112 are provided. The plurality of wire buckles 112 are arranged on the outer surface of the housing 110 and arranged along the second direction.

[0093] In summary, the above zero-sequence mutual inductance structure 10 separates each phase wire by arranging the phase separation spacer 130 on the housing 110, eliminating the production steps such as winding insulating tape and adding insulating inserts. It has a longer creepage distance and better insulation performance, improving the insulation ability of the product in a limited space, meeting the insulation requirements under high voltage and large current conditions, eliminating potential safety hazards, and greatly enhancing the safety performance of the product. At the same time, the A-phase wire and the C-phase wire on both sides adopt a split design, which can not only avoid the problem of difficult penetration of the integrated bent A-phase wire and C-phase wire, but also obtain a wider wiring interface, thus achieving a lower wiring temperature rise.

[0094] Please refer to Figure 8 , this embodiment also provides a circuit breaker, including the above zero-sequence mutual inductance structure 10.

[0095] In all the examples shown and described here, any specific value should be construed as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0096] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0097] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A zero-sequence mutual inductance structure, characterized in that: It comprises a current transformer (100) and a phase line group (200); The current transformer (100) comprises a housing (110) and a magnetic ring (120); an interphase isolating member (130) is arranged on the housing (110); a first channel (131), a second channel (132) and a third channel (133) are arranged on the interphase isolating member (130); and the magnetic ring (120) is arranged around the interphase isolating member (130); The phase line group (200) comprises an A-phase wiring board (210), an A-phase contact (220), a B-phase contact (230), a C-phase wiring board (240) and a C-phase contact (250); the A-phase wiring board (210) or the A-phase contact (220) is arranged in the first channel (131), the A-phase wiring board (210) is connected to the A-phase contact (220), the B-phase contact (230) is arranged in the second channel (132), the C-phase wiring board (240) or the C-phase contact (250) is arranged in the third channel (133), and the C-phase wiring board (240) is connected to the C-phase contact (250); The A-phase contact (220) comprises a third connection portion (221) and a first contact portion (222) connected to each other, the C-phase contact (250) comprises a fourth connection portion (251) and a second contact portion (252) connected to each other, and the third connection portion (221) and the fourth connection portion (251) are extended in directions diverging from each other; The current transformer (100) further comprises a middle cover (140), wherein the middle cover (140) is arranged on a side of the casing (110) away from the magnetic ring (120), and the middle cover (140) and the casing (110) are enclosed to form a first chamber (141) and a second chamber (142); The first chamber (141) is in communication with the first channel (131); one end of the third connection portion (221) facing the fourth connection portion (251) is located in the first chamber (141), and the other end is connected to the first contact portion (222); The second chamber (142) is in communication with the third channel (133); one end of the fourth connection portion (251) facing the third connection portion (221) is located in the second chamber (142), and the other end is connected to the second contact portion (252).

2. The zero-sequence mutual inductance structure according to claim 1, characterized in that: The A-phase wiring board (210) or the A-phase contact (220) comprises a first connection portion (211), the A-phase wiring board (210) and the A-phase contact (220) are connected via the first connection portion (211), and the first connection portion (211) is located in the first channel (131); The C-phase wiring board (240) or the C-phase contact (250) comprises a second connection portion (241), the C-phase wiring board (240) and the C-phase contact (250) are connected via the second connection portion (241), and the second connection portion (241) is located in the third channel (133).

3. The zero-sequence mutual inductance structure according to claim 2, characterized in that: The A-phase wiring board (210) comprises the first connecting portion (211), the first sensing portion (212), the first bending portion (213) and the first wiring portion (214) which are connected in sequence, and the C-phase wiring board (240) comprises the second connecting portion (241), the second sensing portion (242), the second bending portion (243) and the second wiring portion (244) which are connected in sequence; The first sensing portion (212) is disposed in the first channel (131), the second sensing portion (242) is disposed in the second channel (132), and the first bending portion (213) and the second bending portion (243) are extended in directions diverging from each other.

4. The zero-sequence mutual inductance structure according to claim 3, characterized in that: The width of the first wiring portion (214) is greater than the width of the first sensing portion (212), and the width of the second wiring portion (244) is greater than the width of the second sensing portion (242).

5. The zero-sequence mutual inductance structure according to claim 3, characterized in that: One end of the third connection portion (221) facing the fourth connection portion (251) is connected to the first connection portion (211), and one end of the fourth connection portion (251) facing the third connection portion (221) is connected to the second connection portion (241).

6. The zero-sequence mutual inductance structure according to any one of claims 1 to 5, characterized in that: The zero-sequence mutual inductance structure (10) further comprises a temperature detection component (300), wherein the temperature detection component (300) is arranged on the interphase isolation component (130).

7. The zero-sequence mutual inductance structure according to any one of claims 1 to 5, characterized in that: The cover shell (110) is provided with a wiring groove (111); and / or The cover shell (110) is provided with a wire buckle (112).

8. The zero-sequence mutual inductance structure according to any one of claims 1 to 5, characterized in that: The interphase isolator (130) comprises a first insulating portion (134), a second insulating portion (135), a third insulating portion (136) and a fourth insulating portion (137); The first insulating portion (134) is arranged in a ring shape, and the magnetic ring (120) is arranged around the first insulating portion (134); The second insulating portion (135), the third insulating portion (136) and the fourth insulating portion (137) are all located inside the first insulating portion (134); one ends of the second insulating portion (135), the third insulating portion (136) and the fourth insulating portion (137) are connected to each other, and the other ends of the second insulating portion (135), the third insulating portion (136) and the fourth insulating portion (137) are respectively connected to the first insulating portion (134); The first insulating portion (134), the second insulating portion (135) and the third insulating portion (136) together form the first channel (131); the first insulating portion (134), the third insulating portion (136) and the fourth insulating portion (137) together form the second channel (132); and the first insulating portion (134), the second insulating portion (135) and the fourth insulating portion (137) together form the third channel (133).

9. A circuit breaker, characterized in that: It comprises the zero-sequence mutual inductance structure (10) described in any one of claims 1 to 8.

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