Combined non-contact coupling voltage inductor

Abstract

The utility model provides a combined non-contact coupling voltage inductor, and belongs to the technical field of voltage measurement. The combined non-contact coupling voltage inductor comprises a base, a pedestal and a circuit board. The base is provided with one or more U-shaped groove units and is detachably connected with the base; the circuit board is provided with one or more U-shaped bending areas matched with the U-shaped groove units in shape, and one U-shaped bending area corresponds to one U-shaped groove unit; the circuit board is laid on the base along the groove outer wall of the U-shaped groove unit; the circuit board is further provided with a U-shaped induction electrode, and the U-shaped induction electrode is located in the U-shaped bending area. According to the utility model, the cable to be detected passes through the combined structure of the base and the pedestal and is not easy to fall off, and the U-shaped induction electrode is installed on the pedestal, so that the U-shaped induction electrode can be stably kept in an electric field formed by the cable to be detected, and long-term and stable voltage monitoring can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage measurement, in particular to a combined non-contact coupling voltage inductor. Background Art

[0002] Sensing and measurement technologies are the basic supports for the development of power grids and the like. The digital development of power grids requires the prior development of sensing technologies. Voltage and current are two basic parameters in power systems. Among them, the non-contact measurement of voltage sensors is a current research hotspot.

[0003] In the prior art, an open U-shaped coupling inductor, a coupling voltage induction measurement device and method are disclosed (Publication No.: CN117452045A, Publication Date: January 26, 2024), and it is specifically disclosed that the overall shape of the open U-shaped coupling inductor is a U-shaped groove structure; the inner region of the U-shaped groove of the U-shaped groove structure is the fixed area, and the cable to be measured can pass through the fixed area.

[0004] However, when the open U-shaped coupling inductor is actually used, it is easy to fall off the cable to be measured, resulting in the failure of voltage measurement. Summary of the Utility Model

[0005] In order to solve the problem that the existing open U-shaped coupling inductor is easy to fall off the cable to be measured and cause the failure of voltage measurement, the utility model provides a combined non-contact coupling voltage inductor. In the utility model, a base and a pedestal are added, and at the same time, a circuit board with a U-shaped induction electrode is laid on the pedestal. On the one hand, the cable to be measured passes through the combined structure of the base and the pedestal and is not easy to come out. The U-shaped induction electrode is installed on the pedestal, so that the U-shaped induction electrode can be stably maintained in the electric field formed by the cable to be measured, and long-term and stable voltage monitoring can be realized. On the other hand, the pedestal has a certain structural strength, which can provide good support for the U-shaped induction electrode, prevent the U-shaped induction electrode from deforming and being damaged, and also avoid the cable to be measured from directly and repeatedly contacting the U-shaped induction electrode for a long time, shortening the service life of the U-shaped induction electrode.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A combined non-contact coupling voltage inductor, the combined non-contact coupling voltage inductor comprising:

[0008] A base;

[0009] A pedestal, the pedestal having one or more U-shaped groove units; the openings of the U-shaped groove units face the surface of the base and are detachably connected to the base; when there are multiple U-shaped groove units, the edges of the openings of adjacent two U-shaped groove units are connected, and there is a gap between the adjacent outer walls of the grooves;

[0010] A circuit board having one or more U-shaped bending regions adapted to the shape of the U-shaped slot unit, with one U-shaped bending region corresponding to one U-shaped slot unit; the circuit board is laid on the base along the outer wall of the U-shaped slot unit; the circuit board is further provided with a U-shaped sensing electrode, and the U-shaped sensing electrode is located in the U-shaped bending region;

[0011] The cable under test is passed through the U-shaped slot unit, and the U-shaped sensing electrode generates a coupled electric signal in the electric field formed by the cable under test being energized.

[0012] Furthermore, the U-shaped sensing electrode includes M metal layers and N dielectric layers; the metal layers and the dielectric layers are alternately arranged; wherein M and N are integers; the sum of M and N is an odd number greater than or equal to 3; M is greater than N and the difference between M and N is equal to 1.

[0013] Furthermore, the alternately arranged metal layers and dielectric layers first form a flat plate structure, and then the flat plate structure is bent into a U-shape as a whole to form the U-shaped sensing electrode;

[0014] Alternatively, the alternating metal layers and dielectric layers are first formed into a flat plate structure, and then the flat plate structure is folded up and down once or multiple times, and an additional dielectric layer is added between each folded and bent plane to form a folded plate structure, and finally the folded plate structure is bent into a U-shape as a whole to form the U-shaped sensing electrode;

[0015] Alternatively, the alternating metal layers and dielectric layers first form a flat plate structure, and then the flat plate structure is planarly wrapped and an additional dielectric layer is added between each wrapped bending plane to form a wrapped plate structure, and finally the wrapped plate structure is bent into a U-shape as a whole to form the U-shaped sensing electrode.

[0016] Furthermore, ear plates are respectively provided near the two edges of the base perpendicular to the direction in which the tested cable is passed;

[0017] The combined non-contact coupled voltage sensor further comprises a slot-shaped housing; the slot-shaped housing is located between the two ear plates, with its slot against the surface of the base; the outer wall of the slot of the slot-shaped housing is connected to the adjacent ear plates using a snap-fit structure;

[0018] The circuit board is located in a gap between the slot-shaped housing and the base.

[0019] Furthermore, the base has one or more inverted T-shaped platforms on its surface; the vertical portion of each inverted T-shaped platform is correspondingly inserted into the groove area of one of the U-shaped groove units; the horizontal portion of the inverted T-shaped platform is in conflict with the notch of the U-shaped groove unit;

[0020] Both edges of the base in the groove width direction are connected to the inner groove walls of the adjacent groove-shaped housings by snap structures.

[0021] On the outer wall of the bottom of the U-shaped groove unit, two sides in the groove length direction extend towards the bottom area of the groove-shaped housing to form first extension parts, and the first extension parts are in contact with the groove-shaped housing; or, on the inner wall of the bottom of the groove-shaped housing, two sides in the groove length direction extend towards the corresponding U-shaped groove unit to form second extension parts, and the second extension parts are in contact with the U-shaped groove unit; or, on the outer wall of the bottom of the U-shaped groove unit, two sides in the groove length direction extend towards the bottom area of the groove-shaped housing to form first extension parts, and on the inner wall of the bottom of the groove-shaped housing, two sides in the groove length direction extend towards the corresponding U-shaped groove unit to form second extension parts, and the first extension parts and the second extension parts are in contact.

[0022] Furthermore, on both edges of the opening of the U-shaped groove unit along its groove length direction, there are inserted strips; the distance between two adjacent inserted strips is the width of the horizontal part of the inverted T-shaped platform in the direction perpendicular to the threading direction of the cable to be measured, and the horizontal part of the inverted T-shaped platform is clamped between the corresponding two inserted strips.

[0023] Furthermore, when there is only the first extension part, a limiting part is provided on the inner groove wall of the groove-shaped housing at a position adjacent to and in contact with the first extension part; the two first extension parts are simultaneously located between or outside the two limiting parts and are in contact with the adjacent limiting parts.

[0024] When there is only the second extension part, a limiting part is provided on the outer wall of the bottom of the U-shaped groove unit at a position adjacent to and in contact with the second extension part; the two second extension parts are simultaneously located between or outside the two limiting parts and are in contact with the adjacent limiting parts.

[0025] When there are both the first extension part and the second extension part, a limiting part is further provided at a position adjacent to the first extension part on the U-shaped groove unit, or a limiting part is further provided at a position adjacent to the second extension part on the groove-shaped housing; the limiting part is higher than the first extension part or the second extension part; the contact combination structure of the first extension part and the second extension part is simultaneously located between or outside the two limiting parts and is in contact with the adjacent limiting parts.

[0026] Furthermore, a flexible pad is also fitted in the U-shaped groove unit.

[0027] Furthermore, a T-shaped groove is provided on the vertical part of the inverted T-shaped platform, and a corresponding T-shaped part is also provided on the flexible pad to be matched with the T-shaped groove.

[0028] Furthermore, cover plates are provided at both ends of the through cavity formed by the combination and enclosure of the base and the trough-shaped housing.

[0029] The beneficial effects of the present utility model are as follows:

[0030] Compared with the prior art, the combined non-contact coupled voltage inductor in the present utility model adds a base and a pedestal, and at the same time lays a circuit board with a U-shaped induction electrode on the pedestal. On the one hand, the cable under test passes through the combined structure of the base and the pedestal and is not easily disengaged. The U-shaped induction electrode is installed on the pedestal, so that the U-shaped induction electrode can be stably maintained in the electric field formed by the cable under test, and long-term and stable voltage monitoring can be realized. On the other hand, the pedestal has a certain structural strength, which can provide good support for the U-shaped induction electrode, prevent the U-shaped induction electrode from deforming and being damaged, and also avoid the cable under test from directly and repeatedly contacting the U-shaped induction electrode for a long time, shortening the service life of the U-shaped induction electrode. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a three-dimensional structure diagram of the combined non-contact coupled voltage inductor in this embodiment.

[0033] Figure 2 It is a right view of the combined non-contact coupled voltage inductor in this embodiment.

[0034] Figure 3 It is Figure 2 The sectional view taken along the line A-A in

[0035] Figure 4 It is Figure 3 The partial enlarged structural diagram at position B in

[0036] Figure 5 It is the exploded structural diagram of the combined non-contact coupled voltage inductor in this embodiment. Description of the Drawings

[0038] 100 - Base, 110 - Ear plate, 120 - Second retaining platform, 130 - Inverted T-shaped platform, 131 - T-shaped groove;

[0039] 200 - Pedestal, 210 - U-shaped groove unit, 220 - Insertion strip, 230 First extension part, 240 - Limiting part;

[0040] 300 - Circuit board, 310 - U-shaped bending area;

[0041] 400 - Grooved housing, 410 - Mounting groove, 420 - First retaining platform, 430 - Second extension;

[0042] 500 - Flexible pad, 510 - T-shaped part. Detailed implementation manner

[0043] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0044] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model.

[0045] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0046] Figure 1 It is a three-dimensional structural schematic diagram of the combined non-contact coupled voltage inductor in this embodiment. Figure 2 It is a right view of the combined non-contact coupled voltage inductor in this embodiment. Figure 3 For Figure 2 The sectional view taken along the line A-A in

[0047] Figure 4 For Figure 3 The partial enlarged structural schematic diagram at B in Figure 5 It is a decomposed structural schematic diagram of the combined non-contact coupled voltage inductor in this embodiment. As shown in the attached Figures 1 - 3 And the attached Figure 5As shown in the figure, the combined non-contact coupled voltage inductor includes a base 100. A base 200 is detachably arranged on one side surface of the base 100. The base 200 has one or more U-shaped groove units 210. The notch of the U-shaped groove unit 210 faces the surface of the base 100, and the notch of the U-shaped groove unit 210 is detachably connected to the base 100. When there are multiple U-shaped groove units 210, the notch edges of two adjacent U-shaped groove units 210 are connected, and there is a gap between their adjacent groove outer walls. The area inside the groove of the U-shaped groove unit 210 is the area for the cable under test to pass through. After the base 100 and the base 200 are combined, the notch of the U-shaped groove unit 210 is blocked, and the cable under test cannot directly escape from the notch of the U-shaped groove unit 210. At the same time, the combined non-contact coupled voltage inductor further includes a circuit board 300. The circuit board 300 has one or more U-shaped bending areas 310 that are adapted to the shape of the U-shaped groove unit 210, and one U-shaped bending area 310 corresponds to one U-shaped groove unit 210. When the circuit board 300 is laid on the base 200 along the outer wall of the U-shaped groove unit 210, the U-shaped groove unit 210 is located in the inner area of the corresponding U-shaped bending area 310, that is, the U-shaped bending area can surround the main part of the U-shaped groove unit 210, especially can cover the bottom area of the U-shaped groove unit 210. The circuit board 300 is also provided with a U-shaped induction electrode (not shown in the figure). The U-shaped induction electrode is located in the area where the U-shaped bending area 310 is located on the circuit board 300. After the cable under test is energized, an electric field will be formed around it. The U-shaped induction electrode generates a coupled electrical signal in this electric field. After the coupled electrical signal is output and subjected to corresponding enhancement processing, differential processing, etc., the corresponding voltage can be obtained.

[0048] For example, as shown in the attached Figure 1 , attached Figure 3 and attached Figure 5 As shown in the figure, a total of two U-shaped groove units 210 are arranged on the base 100, which can be used for voltage testing of two cables under test at the same time.

[0049] Compared with the prior art, in this embodiment, the combined non-contact coupled voltage inductor is increased with a base and a pedestal, and at the same time, a circuit board with a U-shaped induction electrode is laid on the pedestal. On the one hand, the cable under test passes through the combined structure of the base and the pedestal and is not easily disengaged. The U-shaped induction electrode is installed on the pedestal, so that the U-shaped induction electrode can be stably maintained in the electric field formed by the cable under test, and long-term and stable voltage monitoring can be realized. On the other hand, the pedestal has a certain structural strength, which can provide good support for the U-shaped induction electrode, prevent the U-shaped induction electrode from deforming and being damaged, and also avoid the cable under test from directly and repeatedly contacting the U-shaped induction electrode for a long time, shortening the service life of the U-shaped induction electrode. Finally, the base and the pedestal can be processed from common insulating resin materials such as PE, PVC, etc., which can play a certain insulating role between the U-shaped induction electrode and the cable under test, preventing leakage accidents caused by the damage of the insulating layer of the cable under test.

[0050] The U-shaped induction electrode in this embodiment includes M metal layers and N dielectric layers; the metal layers and the dielectric layers are arranged alternately. Among them, M and N are integers; the sum of M and N is an odd number greater than or equal to 3; M is greater than N and the difference between M and N is equal to 1. When the U-shaped induction electrode is located in the electric field around the cable under test, a coupled electrical signal will be induced between any two metal layers; one or more coupled electrical signals are selected for output. Preferably, M = 2 and N = 1. The metal layer can be copper foil or aluminum foil, and the dielectric in the dielectric layer can be insulating dielectrics such as air, insulating paper, insulating resin, etc.

[0051] Specifically, the U-shaped induction electrode has the following three forms:

[0052] (1) The alternately arranged metal layers and dielectric layers first form a flat plate structure, and then the flat plate structure is integrally U-shaped bent to form a U-shaped induction electrode.

[0053] (2) The alternately arranged metal layers and dielectric layers first form a flat plate structure, then the flat plate structure is stacked up and down in the plane one or more times and an additional dielectric layer is added between each stacked bending plane to form a stacked flat plate structure, and finally the stacked flat plate structure is integrally U-shaped bent to form a U-shaped induction electrode.

[0054] (3) The alternately arranged metal layers and dielectric layers first form a flat plate structure, then the flat plate structure is wrapped around the plane and an additional dielectric layer is added between each wrapped bending plane to form a wrapped flat plate structure, and finally the wrapped flat plate structure is integrally U-shaped bent to form a U-shaped induction electrode.

[0055] In this embodiment, ear plates 110 are respectively arranged on both sides of the base 100 in the direction perpendicular to the threading direction of the cable under test. The combined non-contact coupled voltage inductor further includes a trough-shaped housing 400. The trough-shaped housing 400 is inserted into the area between the two ear plates 110 and connected by a snap structure, and after the outer wall of the trough of the trough-shaped housing 400 is connected to the adjacent ear plate 110 by a snap structure, the trough opening of the trough-shaped housing 400 abuts against the surface of the base 100. After the trough-shaped housing 400 and the base 100 are combined, the base 200 is wrapped therein, and there is a gap between the inside of the trough-shaped housing 400 and the base 100, and this gap is used to accommodate the circuit board 300. Thus, a structurally stable whole is formed between the base 100 and the trough-shaped housing 400. At the same time, the trough-shaped housing 400 can further provide protection for the circuit board.

[0056] For example, in this embodiment, mounting grooves 410 are respectively formed on the opposite outer side walls of the trough-shaped housing 400. A first retaining platform 420 is arranged along the trough length direction in the mounting groove 410. Along the width direction of the first retaining platform 420 (i.e., the trough width direction of the trough-shaped housing 400), its cross-section is in the shape of a right trapezoid. The lower surface of the first retaining platform 420 is an inclined plane, and this inclined plane slopes from the side adjacent to the mounting groove 410 towards the upper surface of the first retaining platform 420. Ear plates 110 are respectively arranged on both sides of the corresponding base 100. Second retaining platforms 120 are arranged on the opposite inner sides of the two ear plates 110. The cross-section of the second retaining platform 120 is also in the shape of a right trapezoid, and its upper surface is an inclined plane that cooperates with the inclined lower surface of the first retaining platform 420. A snap structure is formed between the first retaining platform 420 and the second retaining platform 120, as shown in the appendix Figure 4 As shown. When the trough-shaped housing 400 and the base 100 are combined, the trough-shaped housing 400 is first inserted into the area between the two ear plates 110. After the first retaining platform 420 passes over the second retaining platform 120, it abuts against the second retaining platform 120. At the same time, the trough opening of the trough-shaped housing 400 abuts against the surface of the base 100. Finally, a structurally stable whole is formed between the trough-shaped housing 400 and the base 100. In this embodiment, the cross-sections of the first retaining platform 420 and the second retaining platform 120 can also be in the shape of a semi-circle for cooperation.

[0057] In this embodiment, in addition to being connected by a snap structure between the trough-shaped housing 400 and the base 100 of the base, it can also be fixedly combined by a clamp or a hoop, or can be fixedly combined by means such as bolt connection, so as to realize the detachable connection between the trough-shaped housing 400 and the base 100 of the base.

[0058] In this embodiment, one or more inverted T-shaped platforms 130 are provided on the surface of the base 100. The number of the inverted T-shaped platforms 130 is the same as the number of U-shaped groove units 210 on the base 200, and each inverted T-shaped platform 130 corresponds to a U-shaped groove unit 210. When the base 200 is combined with the base 100, the vertical part of the inverted T-shaped platform 130 is inserted into the groove area of the corresponding U-shaped groove unit 210 in a matching manner, and the inner side wall of the groove of the U-shaped groove unit 210 contacts the side wall of the adjacent inverted T-shaped platform 130. At the same time, the notch of the base 200 contacts the horizontal part of the inverted T-shaped platform 130, and both edges of the base 200 in the groove width direction extend toward the inside of the notch of the groove-shaped housing 400 along the horizontal part of the inverted T-shaped platform 130 respectively, and form a matching buckle structure therewith. The buckle structure is also composed of a first stop 420 and a second stop 120 with similar matching. Furthermore, first extensions 230 are provided on both sides of the outer surface of the bottom of the U-shaped groove unit 210 in the groove length direction and extend toward the bottom area of the groove-shaped housing 400. The first extensions 230 abut against the groove-shaped housing 400; alternatively, second extensions 430 are provided on both sides of the bottom wall of the groove-shaped housing 400 in the groove length direction and extend toward the corresponding U-shaped groove unit 210. The second extensions 430 abut against the U-shaped groove unit 210; alternatively, first extensions 230 are provided on both sides of the outer surface of the bottom of the U-shaped groove unit 210 in the groove length direction and extend toward the bottom area of the groove-shaped housing 400, and second extensions 430 are provided on both sides of the bottom wall of the groove-shaped housing 400 in the groove length direction and extend toward the corresponding U-shaped groove unit 210. The first extensions 230 abut against the second extensions 430, as shown in the appendix Figure 3 as shown. Thus, a structurally stable whole is formed among the base 200, the base 100, and the groove-shaped housing 400.

[0059] In this embodiment, in order to further improve the stability and convenience during the assembly of the base 200, insertion strips 220 are provided on both edges of the notch of the U-shaped groove unit 210 along its groove length direction. When there are multiple U-shaped groove units 210, a common insertion strip 220 is shared between two adjacent U-shaped groove units 210. The distance between two adjacent insertion strips 220 is the width of the horizontal part of the inverted T-shaped platform 130 in the direction perpendicular to the threading direction of the measured cable, and the horizontal part of the inverted T-shaped platform 130 is clamped between the corresponding two insertion strips 220. Thus, the cooperation between the insertion strips 220 and the inverted T-shaped platform 130 can further limit the displacement of the base 200 in the groove width direction, and at the same time, the insertion strips 220 can also play a certain positioning role - facilitating the quick placement of the base 200.

[0060] In this embodiment, when there is only the first extension part 430, a limiting part 240 is arranged on the inner wall of the groove of the groove-shaped housing 400 at a position adjacent to and in contact with the first extension part 430; the two first extension parts 430 are simultaneously located between or outside the two limiting parts 240 and are in contact with the adjacent limiting part 240. When there is only the second extension part 430, a limiting part 240 is arranged on the outer wall of the bottom of the U-shaped groove unit 210 at a position adjacent to and in contact with the second extension part 430; the two second extension parts 430 are simultaneously located between or outside the two limiting parts 240 and are in contact with the adjacent limiting part 240. When there are both the first extension part 230 and the second extension part 430, a limiting part 240 is further arranged on the U-shaped groove unit 210 at a position adjacent to the first extension part 230, or a limiting part 240 is further arranged on the groove-shaped housing 210 at a position adjacent to the second extension part 430; the limiting part 240 is higher than the first extension part 230 or the second extension part 430; the contact combination structure of the first extension part 230 and the second extension part 430 is simultaneously located between or outside the two limiting parts 240 and is in contact with the adjacent limiting part 240, as shown in the appendix Figure 3 shown. In this embodiment, by arranging the limiting part 240, the positions of the first extension part 230, the second extension part 430 or the combination structure of the first extension part 230 and the second extension part 430 can be restricted, and the displacement of the base 200 in the groove length direction can be restricted.

[0061] In this embodiment, in order to place the cable under test at the bottom of the U-shaped groove unit 210, a flexible pad 500 made of rubber, silica gel or other materials is also cooperatively arranged in the U-shaped groove unit 210. The gap between the bottom of the U-shaped groove unit 210 and the flexible pad 500 forms a threading area for the cable under test. Since the flexible pad 500 itself has a certain deformation ability, on the one hand, it can be squeezed and deformed to appropriately increase the threading area when threading the cable under test, which is beneficial to the threading of the cable under test. On the other hand, after the cable under test is threaded and the flexible pad 500 resumes its deformation, it can provide a certain thrust to the cable under test, so that the position of the cable under test in the U-shaped groove unit 210 is kept fixed.

[0062] In this embodiment, in order to prevent the flexible pad 500 from coming out of the U-shaped groove unit 210, a T-shaped groove 131 is opened on the vertical part of the inverted T-shaped platform 130, and correspondingly, the flexible pad 500 is also provided with a T-shaped part 510 that cooperates with the T-shaped groove 131, as shown in the appendix Figure 5 shown.

[0063] In this embodiment, in order to prevent the circuit board 300 from coming out of the gap between the base 200 and the groove-shaped housing 400, cover plates (not shown in the figure) are arranged at both ends of the through cavity formed by the combination and enclosure of the base 200 and the groove-shaped housing 400.

[0064] In this embodiment, the combined non-contact coupled voltage inductor adopts a combined structure design, which enables rapid assembly and quick replacement of corresponding components.

Claims

1. A combined non-contact coupled voltage inductor, characterized in that, The combined non-contact coupled voltage inductor includes: a base; a pedestal having one or more U-shaped groove units; the notch of the U-shaped groove unit faces the surface of the base and is detachably connected to the base; when there are multiple U-shaped groove units, the notch edges of two adjacent U-shaped groove units are connected, and there is a gap between their adjacent groove outer walls; a circuit board having one or more U-shaped bending areas adapted to the shape of the U-shaped groove units, and one U-shaped bending area corresponds to one U-shaped groove unit; the circuit board is laid on the pedestal along the outer wall of the U-shaped groove unit; the circuit board is also provided with a U-shaped induction electrode located in the U-shaped bending area; wherein, the cable under test is threaded through the U-shaped groove unit, and the U-shaped induction electrode generates a coupled electrical signal in the electric field formed when the cable under test is energized.

2. The combined non-contact coupled voltage inductor according to claim 1, characterized in that, The U-shaped induction electrode includes M metal layers and N dielectric layers; the metal layers and the dielectric layers are arranged alternately; wherein, M and N are integers; The sum of M and N is an odd number greater than or equal to 3; M is greater than N and the difference between M and N is equal to 1; The alternately arranged metal layers and dielectric layers first form a flat plate structure, and then the flat plate structure is integrally U-shaped bent to form the U-shaped induction electrode; or, the alternately arranged metal layers and dielectric layers first form a flat plate structure, and then the flat plate structure is wound up and down in a plane one or more times and an additional dielectric layer is added between each winding and bending plane to form a wound flat plate structure, and finally the wound flat plate structure is integrally U-shaped bent to form the U-shaped induction electrode; or, the alternately arranged metal layers and dielectric layers first form a flat plate structure, and then the flat plate structure is wrapped around in a plane and an additional dielectric layer is added between each wrapping and bending plane to form a wrapped flat plate structure, and finally the wrapped flat plate structure is integrally U-shaped bent to form the U-shaped induction electrode.

3. The combined non-contact coupled voltage inductor according to claim 1, wherein The combined non-contact coupled voltage inductor further includes a trough-shaped housing; the notch of the trough-shaped housing abuts against the surface of the pedestal; the trough-shaped housing is detachably connected to the pedestal; The circuit board is located in the gap between the trough-shaped housing and the pedestal.

4. The combined non-contact coupled voltage inductor according to claim 1, characterized in that, Lugs are respectively arranged near the two edge portions perpendicular to the threading direction of the cable under test on the base; The combined non-contact coupled voltage inductor further includes a trough-shaped housing; the trough-shaped housing is located between the two lugs, and its notch abuts against the surface of the pedestal; a snap structure is used for connecting between the outer wall of the trough-shaped housing and the adjacent lug; The circuit board is located in the gap between the trough-shaped housing and the pedestal.

5. The combined non-contact coupled voltage inductor according to claim 3 or 4, characterized in that One or more inverted T-shaped platforms are provided on the surface of the base; the vertical portion of each inverted T-shaped platform is correspondingly inserted into the groove inner area of a U-shaped groove unit; the horizontal portion of the inverted T-shaped platform abuts against the notch of the U-shaped groove unit; A snap structure is used for connecting between the two edge portions in the groove width direction of the pedestal and the inner wall of the adjacent trough-shaped housing; On the outer wall of the bottom of the U-shaped groove unit, first extension parts are arranged to extend towards the bottom area of the groove-shaped housing on both sides in the groove length direction, and the first extension parts are in contact with the groove-shaped housing; alternatively, on the inner wall of the bottom of the groove-shaped housing, second extension parts are arranged to extend towards the corresponding U-shaped groove unit on both sides in the groove length direction, and the second extension parts are in contact with the U-shaped groove unit; alternatively, on the outer wall of the bottom of the U-shaped groove unit, first extension parts are arranged to extend towards the bottom area of the groove-shaped housing on both sides in the groove length direction, and on the inner wall of the bottom of the groove-shaped housing, second extension parts are arranged to extend towards the corresponding U-shaped groove unit on both sides in the groove length direction, and the first extension parts and the second extension parts are in contact with each other.

6. The combined non-contact coupled voltage inductor according to claim 5, characterized in that, On both edges of the notch of the U-shaped groove unit, inserting strips are arranged along its groove length direction; the distance between two adjacent inserting strips is the width of the horizontal part of the inverted T-shaped platform in the direction perpendicular to the threading direction of the cable to be measured, and the horizontal part of the inverted T-shaped platform is clamped between two corresponding inserting strips.

7. The combined non-contact coupled voltage inductor according to claim 5, characterized in that, When there is only the first extension part, a limiting part is arranged on the inner wall of the groove of the groove-shaped housing at a position adjacent to and in contact with the first extension part; the two first extension parts are simultaneously located between or outside the two limiting parts and are in contact with the adjacent limiting parts; When there is only the second extension part, a limiting part is arranged on the outer wall of the bottom of the U-shaped groove unit at a position adjacent to and in contact with the second extension part; the two second extension parts are simultaneously located between or outside the two limiting parts and are in contact with the adjacent limiting parts; When there are both the first extension part and the second extension part, a limiting part is further arranged at a position adjacent to the first extension part on the U-shaped groove unit, or a limiting part is further arranged at a position adjacent to the second extension part on the groove-shaped housing; the limiting part is higher than the first extension part or the second extension part; the contact combination structure of the first extension part and the second extension part is simultaneously located between or outside the two limiting parts and is in contact with the adjacent limiting parts.

8. The combined non-contact coupled voltage inductor according to claim 5, characterized in that A flexible pad is also fitted in the U-shaped groove unit.

9. The combined non-contact coupled voltage inductor according to claim 8, wherein, A T-shaped groove is formed on the vertical part of the inverted T-shaped platform, and a T-shaped part matching the T-shaped groove is also arranged on the corresponding flexible pad.

10. The combined non-contact coupled voltage inductor according to claim 4, characterized in that, Covers are arranged at both ends of the through cavity formed by the combination of the base and the groove-shaped housing.

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