Open-close type vertical magnetic field interference resisting inductor, electric power meter thereof and manufacturing method of electric power meter

Abstract

The invention relates to an open-close type vertical magnetic field interference resisting inductor, an electric power meter and a manufacturing method of the open-close type vertical magnetic field interference resisting inductor, which comprises an open-close type Rogowski coil, vertical magnetic field counteracting coils connected in series and a plurality of self-adhesion hollow coils symmetrically distributed on the same horizontal plane by taking a circle as a center, the vertical magnetic field counteracting coil is located in the center of an annular channel formed by the hollow coil hole part, the reclamation area of the vertical magnetic field counteracting coil is equal to the reclamation area surrounded by the Rogowski coil, the Rogowski coil comprises a first Rogowski coil and a second Rogowski coil, and the vertical magnetic field counteracting coil comprises a first loop segment, a second loop segment and a connecting part. Each of the first Rogowski coil and the second Rogowski coil comprises a connecting end and an opening and closing end, the connecting ends of the first Rogowski coil and the second Rogowski coil are close to each other and are aligned with the connecting part, and an output end is formed on the Rogowski coil or the vertical magnetic field offset coil. Therefore, the technical problem that small current detection is easily interfered by an external power frequency electromagnetic field is solved, and installation and maintenance are convenient.

Description

Technical Field

[0001] This invention relates to an openable anti-vertical magnetic field interference sensor for use in electrical instruments, its power meter and manufacturing method, and particularly to an openable anti-vertical magnetic field interference sensor, its power meter and manufacturing method applicable to the field of power transmission. Background Technology

[0002] In the process of building and developing the national smart grid, electronic instrument transformers, as a core component of primary equipment in the power system, directly determine the accuracy and stability of grid operation status monitoring and are key devices for accurately acquiring critical electrical parameters such as current and voltage. Currently, current transformers remain the mainstream equipment in the field of AC current detection, mainly divided into the following two categories:

[0003] One type is the iron-core coil current transformer, which requires the design of iron core structures of different sizes according to the rated current (In) specifications. It not only has the problems of large size and high production cost, but also the iron core is prone to magnetic saturation, which leads to obvious nonlinearity in output characteristics. Ultimately, the measurement range is limited, and it is usually only suitable for the range of 0.1In to 2In, which is difficult to meet the needs of wide-range current monitoring.

[0004] Another type is the Rogowski coil current sensor (also known as a hollow current transformer or magnetic potential meter). It measures current by uniformly winding a coil onto a non-magnetic frame and then encasing the conductor being measured. It consists of two parts: a Rogowski coil sensing head and a signal integrator / processor circuit. The sensing head, as the core sensing element, establishes a coupling relationship between the captured electromagnetic field and the measured current. This type of sensor has advantages such as small size and low material cost. Its coreless structure also gives it excellent linearity. The measurement range can cover currents from 0.1 In to tens of thousands of amperes or even larger, making it widely used in high-current detection scenarios. However, Rogowski coils have two major limitations: First, they are extremely sensitive to electromagnetic interference, especially power frequency electromagnetic interference. In low-current detection scenarios below a few hundred amperes, external interference signals can easily overwrite the actual measurement signal, causing significant errors. Second, traditional Rogowski coils are integral structures that cannot be disassembled. They can only be installed when the primary current line is not laid or the power is off. If current monitoring or equipment maintenance is required on an already running line, the power must be turned off, which not only affects the continuity of power supply but also increases the complexity and safety risks of on-site operations.

[0005] In summary, in the power sector, especially in demanding scenarios involving public electricity safety and power supply continuity, optimizing the structure and performance of Rogowski coil current transformers to address their weak resistance to external magnetic field interference while overcoming the limitations of installation and maintenance caused by the integrated structure has become a key technical challenge that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an openable anti-vertical magnetic field interference sensor, its power meter, and its manufacturing method that can resist or eliminate external vertical magnetic field interference in all directions.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical approach:

[0008] A retractable vertical magnetic field interference sensor includes a ring-shaped retractable Rogowski coil and a retractable annular vertical magnetic field cancellation coil located inside and connected in series with the Rogowski coil. The Rogowski coil comprises several self-adhesive hollow coils connected end-to-end. Each hollow coil has a hollow cavity inside. The wire diameter, number of turns, number of layers, inner diameter, and outer diameter of each hollow coil are identical. There are an even number of hollow coils, symmetrically distributed around a circle on the same horizontal plane. The cavities together form an annular channel. The vertical magnetic field cancellation coil is located at the center of the annular channel. The area enclosed by the vertical magnetic field cancellation coil is equal to the area enclosed by the Rogowski coil. The retractable Rogowski coil... The coil includes an arc-shaped first Rogowski coil and an arc-shaped second Rogowski coil that together form a complete circular ring. The vertical magnetic field cancellation coil includes a first loop segment located within the annular channel of the first Rogowski coil, a second loop segment located within the annular channel of the second Rogowski coil, and a connecting portion electrically connecting the first loop segment and the second loop segment. Both the first Rogowski coil and the second Rogowski coil include connecting ends and opening / closing ends located at both ends. The connecting ends of the first Rogowski coil and the second Rogowski coil are close to each other and aligned with the connecting portion of the vertical magnetic field cancellation coil. Together, they form a pair of output terminals of an opening / closing anti-vertical magnetic field interference sensor on the opening / closing Rogowski coil or on the opening / closing annular vertical magnetic field cancellation coil.

[0009] As a further improvement of the present invention, a matching openable pre-positioning bracket is provided inside the openable Rogowski coil. The pre-positioning bracket is used to connect several hollow coils together in series. The pre-positioning bracket includes an arc-shaped first pre-positioning bracket and an arc-shaped second pre-positioning bracket. The first return segment is located inside the first pre-positioning bracket and at the center of the annular channel of the first Rogowski coil. The second return segment is located inside the second pre-positioning bracket and at the center of the annular channel of the second Rogowski coil.

[0010] As a further improvement of the present invention, the output terminal includes a first output line and a second output line, both of which are disposed on the open-type Rogowski coil. The first output line is electrically connected to the connection terminal of the first Rogowski coil, and the second output line is electrically connected to the connection terminal of the second Rogowski coil. The first output line and the second output line are twisted together near the connection portion and output an electrical signal outward.

[0011] As a further improvement of the present invention, the output terminal includes a first output line and a second output line. The first Rogowski coil connection terminal is electrically connected to the second Rogowski coil connection terminal and aligned with the connection portion. The first output line is disposed on one of the open / closed ends of the open / closed Rogowski coil. The first loop segment and the second loop segment of the vertical magnetic field cancelling coil respectively include a head end connecting the two ends of the connection portion and an end end located at the other end of the head end. The second output line is disposed on one of the ends of the vertical magnetic field cancelling coil near the first output line. The first output line and the second output line are twisted together and output an electrical signal outward.

[0012] As a further improvement of the present invention, the second output line extends integrally from the end of the vertical magnetic field cancelling coil, and the connection end of the first Rogowski coil is integrally connected to the connection end of the second Rogowski coil or electrically connected through a pivot end.

[0013] As a further improvement of the present invention, a single hollow coil includes continuously winding single coil layers arranged neatly with respect to wire diameter on a coil fixture. After each single coil layer is wound, the next single coil layer is wound in the opposite direction on the outside. The adjacent inner and outer single coil layers are arranged neatly with respect to each other. The number of single coil layers is odd and ≥3 layers. After one hollow coil is wound, the next identical hollow coil is wound.

[0014] As a further improvement of the present invention, the first Rogowski coil and the second Rogowski coil are wound in a continuous and unidirectional manner, and both are distributed in a semi-circular shape. The spacing between each adjacent hollow coil is less than 1-5% of the radius of the Rogowski coil.

[0015] As a further improvement of the present invention, the openable anti-vertical magnetic field interference sensor further includes a first housing for accommodating the first Rogowski coil and the first loop segment, and a second housing for accommodating the second Rogowski coil and the second loop segment. The first housing and the second housing are symmetrically arranged and each includes a semi-circular annular bottom wall, an inner wall extending laterally from the inner circle of the bottom wall, an outer wall extending laterally from the outer circle of the bottom wall, and end walls at both ends connecting the inner wall and the outer wall. The bottom wall, inner wall, outer wall, and end walls form a semi-open semi-circular annular receiving cavity. The first Rogowski coil and the second Rogowski coil are respectively housed in each of the receiving cavities, and the inner wall passes through and surrounds the Rogowski coil. At the center of the coil, a primary current passage hole is formed to allow the primary current line to pass through the center of the Rogowski coil and the vertical magnetic field cancelling coil. The housing cavity is provided with coil positioning holes for fixing each hollow coil. The openable vertical magnetic field interference sensor also includes a housing part, which includes an upper end shell for housing the first housing and a lower end shell for housing the second housing. Both the upper end shell and the lower end shell are provided with a pivot part and an opening and closing part. The pivot parts are pivotally connected to each other and close to the connecting part. The opening and closing parts can be opened and closed and are respectively used to house the opening and closing ends. The outer housing part has an outwardly protruding part on the side for housing the output end.

[0016] To achieve the above-mentioned technical objectives, the present invention may also employ the following technical methods:

[0017] An electrical meter includes an electrical meter housing and the aforementioned openable anti-vertical magnetic field interference sensor located within the electrical meter housing.

[0018] To achieve the above-mentioned technical objectives, the present invention may also employ the following technical methods:

[0019] A method for manufacturing an openable vertical magnetic field interference-resistant sensor, comprising:

[0020] Multiple hollow coils are continuously wound from enameled wire and connected in series. Each hollow coil includes a single coil layer that is continuously wound on a coil fixture and arranged in a neat manner according to the wire diameter. After each single coil layer is wound, the next single coil layer is wound in the opposite direction on the outside. The adjacent inner and outer single coil layers are arranged neatly. The number of single coil layers is odd and ≥3 layers.

[0021] On the next coil fixture that is vertically and horizontally offset from the coil fixture, the next hollow coil is continuously wound.

[0022] Multiple coil jigs are arranged in a stepped manner and wound one by one. After the multiple hollow coils are wound on the multiple coil jigs, they are removed from the coil jigs to complete the automated production of the first Rogowski coil and / or the second Rogowski coil.

[0023] A vertical magnetic field cancelling coil is provided, including an arc-shaped first loop segment, an arc-shaped second loop segment, and a connecting part that electrically connects the first loop segment and the second loop segment. The first loop segment is inserted or held in a first prepositioning bracket and inserted in the center of the annular channel of the first Rogowski coil; the second loop segment is inserted or held in a second prepositioning bracket and inserted in the center of the annular channel of the second Rogowski coil.

[0024] The hollow coil, the first loop segment, the second loop segment, the first prepositioning bracket, and the second prepositioning bracket together form an openable ring, so that the multiple hollow coils are symmetrically distributed on the same horizontal plane with the circle as the center. The holes together form an annular channel. The first loop segment and the second loop segment are located at the center of the annular channel, so that the reclamation area enclosed by the first loop segment and the second loop segment is equal to the reclamation area enclosed by the first and second Rogowski coils.

[0025] The output terminals are respectively located on the connection terminals of the first Rogowski coil and the second Rogowski coil, and are twisted together near the connection to output signals outward; or the output terminals are respectively located on one of the open / closed ends of the Rogowski coil and one of the corresponding ends of the vertical magnetic field cancelling coil, and are twisted together at the open / closed ends to output signals outward.

[0026] Compared to existing technologies, the vertical magnetic field cancellation coil of the present invention's openable vertical magnetic field interference sensor is located at the center of the annular channel. The area enclosed by the vertical magnetic field cancellation coil is equal to the area enclosed by the Rogowski coil. The vertical magnetic field cancellation coil includes a first loop segment located within the annular channel of the first Rogowski coil, a second loop segment located within the annular channel of the second Rogowski coil, and a connecting portion electrically connecting the first loop segment and the second loop segment. Both the first Rogowski coil and the second Rogowski coil include connecting ends and opening / closing ends located at both ends. The connecting ends of the first Rogowski coil and the second Rogowski coil are close to each other and aligned with the connecting portion of the vertical magnetic field cancellation coil. Together, they form a pair of output terminals of the openable vertical magnetic field interference sensor on the openable Rogowski coil or on the openable annular vertical magnetic field cancellation coil. Thus, the Rogowski coil and the vertical magnetic field cancellation coil enable the openable anti-vertical magnetic field interference sensor to cancel external magnetic field interference from all directions as a whole. This solves the technical problem that ordinary Rogowski coils are easily affected by external power frequency electromagnetic fields when used for small current detection, resulting in large measurement errors and failing to reflect the actual current correctly. This overcomes the current limitations of Rogowski coil applications. Furthermore, it can be opened or closed synchronously as needed, facilitating installation to or removal from the next current line. This makes it convenient for current monitoring or equipment maintenance of existing lines. The vertical magnetic field cancellation coil is integrally formed, and a pair of output ends can form a twisted structure near the middle or one of the ends of the vertical magnetic field cancellation coil. By effectively controlling the tightness and positional accuracy of the twisted structure, the enclosed area of ​​the vertical magnetic field cancellation coil is more accurately equal to the enclosed area of ​​the Rogowski coil, further improving anti-interference capability, without affecting the continuity of power supply, and significantly reducing the complexity and safety risks of on-site operations. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the Rogowski coil and the first and second output lines of the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention.

[0028] Figure 2 This is a schematic diagram of the vertical magnetic field cancellation coil and the prepositioning bracket in the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention.

[0029] Figure 3 This is a schematic diagram of the combination of the vertical magnetic field cancellation coil and the prepositioning bracket in the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention.

[0030] Figure 4 This is a schematic diagram of the combination of the Rogowski coil, the first output line, the second output line, the vertical magnetic field cancellation coil, and the positioning soft rubber strip in the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention.

[0031] Figure 5 yes Figure 4 A combined diagram from another angle.

[0032] Figure 6 This is a schematic diagram of the structure of the openable anti-vertical magnetic field interference sensor housing of the present invention.

[0033] Figure 7 This is a schematic diagram of the structure of the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention when it is opened.

[0034] Figure 8 This is a schematic diagram of the structure of the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention when closed.

[0035] Figure 9 This is a schematic diagram of the structure of the opening and closing type anti-vertical magnetic field interference sensor housing of the present invention.

[0036] Figure 10 This is a schematic diagram of the structure of the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention after the housing is installed.

[0037] Figure 11 This is a schematic diagram of the structure of the first embodiment of the openable anti-vertical magnetic field interference sensor of the present invention when the outer shell is installed and closed.

[0038] Figure 12 This is a schematic diagram of the structure of the Rogowski coil and the first output line in the second embodiment of the openable anti-vertical magnetic field interference sensor of the present invention;

[0039] Figure 13 This is a schematic diagram of the vertical magnetic field cancellation coil and the prepositioning bracket in the second embodiment of the openable anti-vertical magnetic field interference sensor of the present invention.

[0040] Figure 14 This is a schematic diagram of the combination of the Rogowski coil, the first output line, the second output line, the vertical magnetic field cancellation coil, and the positioning soft rubber strip in the second embodiment of the openable anti-vertical magnetic field interference sensor of the present invention.

[0041] Figure 15 yes Figure 14 A combined diagram from another angle.

[0042] Figure 16 This is a schematic diagram of the structure of the second embodiment of the openable anti-vertical magnetic field interference sensor of the present invention when it is opened.

[0043] Figure 17 This is a schematic diagram of the structure of the second embodiment of the openable anti-vertical magnetic field interference sensor of the present invention after the housing is installed.

[0044] Figure 18 This is a schematic diagram of the structure of a single hollow coil of the openable anti-vertical magnetic field interference sensor of the present invention.

[0045] Figure label:

[0046] Openable vertical magnetic field interference sensor 100, 200

[0047] 10 hollow coils, 1001 single coil layers

[0048] Hole 1002 First Rogowski Coil 11

[0049] Connection end 1103 Opening / closing end 1104

[0050] Coil start 1101 Coil end 1102

[0051] First output line 101 Second Rogowski coil 12

[0052] Connecting end 1203 Opening / closing end 1204

[0053] Coil start 1201 Coil end 1202

[0054] Second output line 102, First output line 101'

[0055] Pivot end 13 Annular channel 104

[0056] Vertical magnetic field cancellation coil 2, first loop segment 211

[0057] Head end 2111 End end 2112

[0058] Second segment 221, head end 2211

[0059] Terminal 2212 Second output line 102'

[0060] Connecting part 23 First prepositioning bracket 31

[0061] Through hole 311 Second prepositioning bracket 32

[0062] Through hole 312 for bracket; first housing 61

[0063] Bottom wall 611 Inner wall 612

[0064] Outer wall 613 End walls 614, 615

[0065] Containment cavity 616, coil positioning cavity 618

[0066] Second shell 62, bottom wall 621

[0067] Inner wall 622 Outer wall 623

[0068] End walls 624, 625; Receiving cavity 626

[0069] Coil positioning hole 628; primary current through hole 630

[0070] Outer shell 7 Upper shell 71

[0071] Containment chamber 710, lower shell 72

[0072] Containment Chamber 720, Pivot Section 73

[0073] Opening / closing part 74, screw 75

[0074] Outer protrusion 751 Outer protrusion 752 Detailed Implementation

[0075] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0076] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0077] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0078] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0079] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0080] Please refer to Figures 1 to 18The diagram shown is a structural schematic of the openable vertical magnetic field interference sensor 100 and 200 of the present invention. The openable vertical magnetic field interference sensor 100 and 200 of the present invention includes annularly distributed openable Rogowski coils and an openable annular vertical magnetic field cancellation coil 2 located inside the Rogowski coils and connected in series with them. The Rogowski coil includes several self-adhesive hollow coils 10 connected end-to-end. In this embodiment, the Rogowski coil is continuously wound from enameled wire. The enameled wire has inherent adhesiveness or is coated with adhesive, allowing the enameled wire to adhere to each other while being wound, preventing scattering and improving winding accuracy and efficiency. Each hollow coil 10 has a hollow cavity 1002 inside, and no magnetic or non-magnetic core is required inside the cavity 1002. The wire diameter, number of turns, number of layers, inner diameter, and outer diameter of each hollow coil 10 are consistent. There are an even number of hollow coils 10, symmetrically distributed around a circle on the same horizontal plane, i.e., an even number of hollow coils 10 axially symmetrically distributed. The center is where the primary current passes through, allowing the primary current line to pass through. The Rogowski coil is used to detect the data generated when the primary current line passes through. Thus, because the hollow coils 10 are symmetrically distributed around the center, the spatial positions of adjacent hollow coils 10 are "mirror images" or "rotationally symmetrical" relative to the center of symmetry. When they are connected in series with the correct polarity (winding direction), the induced electromotive forces generated by the same vertical interfering magnetic field in adjacent hollow coils 10 will be equal in magnitude and opposite in direction. When subjected to external magnetic field interference, the generated induced electromotive forces can be uniformly canceled out, achieving better resistance to external magnetic field interference and improving the accuracy and anti-interference capability of the meter. All the holes 1002 of the hollow coils 10 together form an annular channel 104. The vertical magnetic field cancelling coil 2 is located at the center of the annular channel 104. The area enclosed by the vertical magnetic field cancelling coil 2 is equal to the area enclosed by the Rogowski coil. Thus, the Rogowski coil and the vertical magnetic field cancelling coil 2 each form an enclosed circuit. The two enclosed circuits are connected in series, which enables the two enclosed circuits to cancel each other out the induced electromotive force they receive under external electromagnetic interference, thereby improving the detection accuracy of the openable anti-vertical magnetic field interference sensors 100 and 200. To realize the openability of the Rogowski coil, the openable Rogowski coil includes an arc-shaped first Rogowski coil 11 and an arc-shaped second Rogowski coil 12 that can together form a complete circular ring. The vertical magnetic field cancelling coil 2 includes a first loop segment 211 located in the annular channel 104 of the first Rogowski coil 11, a second loop segment 221 located in the annular channel 104 of the second Rogowski coil 12, and a connecting part 23 electrically connecting the first loop segment 211 and the second loop segment 221. Figure 2 and Figure 13As shown, the vertical magnetic field cancelling coil 2 of the present invention is integrally formed, which allows for more accurate control of the induced electromotive force generated by the vertical magnetic field cancelling coil 2 under external magnetic field interference, resulting in better stability. Both the first Rogowski coil 11 and the second Rogowski coil 12 include connecting ends 1103 and 1203 and opening / closing ends 1104 and 1204 located at both ends. That is, the first Rogowski coil 11 includes a connecting end 1103 and an opening / closing end 1104, and the second Rogowski coil 12 includes a connecting end 1203 and an opening / closing end 1204. The connecting ends 1103 of the first Rogowski coil 11 and 1203 of the second Rogowski coil 12 are close to each other and aligned with the connecting portion 23 of the vertical magnetic field cancelling coil 2. The Rogowski coil cancels the vertical magnetic field. Coil 2 is not electrically connected at this location. With this configuration, the Rogowski coil can form an output terminal or a pivot terminal 13 at the location of the connection part 23, allowing the openable Rogowski coil to open or close with the connection terminals 1103 and 1203 as the pivot center. This also allows the openable terminals 1104 of the first Rogowski coil 11 and 1204 of the second Rogowski coil 12 to selectively separate or close, thereby facilitating the connection of the entire openable anti-vertical magnetic field interference sensor 100 and 200 to the periphery of the primary current line for accurate detection of the current passing through the primary current.

[0081] The openable anti-vertical magnetic field interference sensors 100 and 200 of this invention can better maintain the consistency of the structure and distribution of each hollow coil 10. They can effectively utilize geometric symmetry and series reverse connection to achieve mutual cancellation of the induced electromotive force of the interfering magnetic field. When subjected to magnetic field interference perpendicular to the plane where the Rogowski coils are distributed, the vertical magnetic field cancellation coil 2 located at the center of the Rogowski coils can better cancel the induced electromotive force generated by the Rogowski coils themselves. Thus, the Rogowski coils and the vertical magnetic field cancellation coil 2 enable the openable anti-vertical magnetic field interference sensors 100 and 200 of this invention to perfectly cancel external magnetic field interference from all directions as a whole, solving the problem of using ordinary Rogowski coils (not shown) for small current detection. This technology overcomes the limitations of current Rogowski coil applications by addressing the technical problem of being highly susceptible to interference from external power frequency electromagnetic fields, leading to significant measurement errors and an inability to accurately reflect actual currents. Furthermore, the hollow interior of the Rogowski coil, without a magnetic or iron core, ensures that the open-type anti-vertical magnetic field interference sensors 100 and 200 are non-magnetically saturated, making them ideal for measuring very large currents, currents containing DC components (such as short-circuit fault currents and currents in power electronic equipment), and severely distorted currents. With a wide frequency response, free from the limitations of eddy current losses, hysteresis losses, and distributed capacitance associated with iron cores, it possesses a very wide bandwidth (from a few Hz to several MHz, or even higher), enabling accurate measurement of high-frequency currents and fast transient currents (such as lightning strikes and switching currents). It is suitable for handling surges, rapid turn-off currents of power electronic switches, and currents containing rich harmonics; it exhibits good linearity, with the output signal (induced voltage) strictly proportional to the rate of change of the measured current (di / dt). Under constant coil design parameters (such as turns density and cross-sectional area) and without saturation, its response is linear, maintaining a good linear relationship between input (current change rate) and output (voltage) throughout the entire measurement range, resulting in high measurement accuracy; it has low load effect, with relatively low output impedance, resulting in very small load effect on the measured circuit, almost no impact on the measured current loop, making it easy to connect to the measurement system; it is flexible, lightweight, and easy to install, facilitating installation in space-constrained locations, and the coil itself has good electrical properties with the measured high-voltage conductor. Isolation improves operational safety; wide measurement range: by adjusting the number of coil turns and other device parameters, the same coil design can cover a very wide current measurement range (from a few amperes to millions of amperes) without requiring different turns ratios like traditional CTs; no residual magnetism: no residual magnetism is left after measurement, which will not affect the accuracy of the next measurement, making it especially suitable for measuring non-periodic transient large currents; and the first and second Rogowski coils 11 and 12, along with the first circuit segment 211 and the second circuit segment 221, can be opened or closed synchronously as needed, facilitating installation to or disconnection from the next current line, enabling current monitoring or equipment maintenance of operating lines without affecting the continuity of power supply, and significantly reducing the complexity and safety risks of on-site operations.

[0082] In this invention, a pair of output terminals are formed on the opening and closing Rogowski coil or together with the opening and closing annular vertical magnetic field cancellation coil 2 to form an opening and closing anti-vertical magnetic field interference sensor 100, 200. In the first embodiment, the output terminals are the first output line 101 and the second output line 102. In the second embodiment, the output terminals are the first output line 101' and the second output line 102'. That is, both of the pair of output terminals are located on the opening and closing Rogowski coil, or one output terminal is located on the opening and closing Rogowski coil and the other output terminal is located on the vertical magnetic field cancellation coil 2. With this configuration, the shape of the opening and closing annular vertical magnetic field cancellation coil 2 is fixed. During the manufacturing and assembly process of the opening and closing anti-vertical magnetic field interference sensors 100 and 200, the enclosed area of ​​the vertical magnetic field cancellation coil 2 can be effectively controlled. A pair of output ends can form a twisted structure near the middle position of the vertical magnetic field cancellation coil 2 (i.e., the position of the connecting part 23 in the first embodiment) or at one of the ends 2112 and 2212 (e.g., the end 2212 in the second embodiment), thereby outputting a signal outward. By effectively controlling the tightness and positional accuracy of the twisted structure, the enclosed area of ​​the vertical magnetic field cancellation coil 2 can be more accurately made equal to the enclosed area of ​​the Rogowski coil, further improving the anti-interference capability of the opening and closing anti-vertical magnetic field interference sensors 100 and 200.

[0083] A matching openable pre-positioning bracket is installed inside the openable Rogowski coil. The pre-positioning bracket is used to connect several hollow coils 10 together in series. The pre-positioning bracket includes an arc-shaped first pre-positioning bracket 31 and an arc-shaped second pre-positioning bracket 32. The first loop segment 211 is located inside the first pre-positioning bracket 31 and at the center of the annular channel 104 of the first Rogowski coil 11. The second loop segment 221 is located inside the second pre-positioning bracket 32 ​​and at the center of the annular channel 104 of the second Rogowski coil 12. This arrangement ensures that the first loop segment 211 and the second loop segment 221 are located at the center of the first and second Rogowski coils 11 and 12, respectively, so that the area enclosed by the vertical magnetic field cancelling coil 2 is equal to the area enclosed by the Rogowski coil. This ensures that the first and second Rogowski coils 11 and 12, together with the first loop segment 211 and the second loop segment 221, enable the openable anti-vertical electric field interference sensors 100 and 200 to cancel external magnetic field interference from all directions as a whole.

[0084] The pre-positioning bracket is a flexible positioning strip, such as silicone, rubber, or flexible PVC. The pre-positioning bracket has through holes 311 and 312 in its center or on its side. The vertical magnetic field cancelling coil 2 passes through or is held in the through holes 311 and 312. That is, the first loop segment 211 and the second loop segment 221 can pass through or be held in the through holes 311 and 312 of the first pre-positioning bracket 31 and the second pre-positioning bracket 32. This arrangement facilitates the precise installation of the first loop segment 211 and the second loop segment 221. Specifically, the first loop segment 211 and the second loop segment 221 of the vertical magnetic field cancelling coil 2 can also be flexible wires. After the flexible wires are inserted or held in the prepositioning bracket, the prepositioning bracket can be inserted into the hole 1002 of each hollow coil 10, thereby connecting the hollow coils 10 in series. Then, the vertical magnetic field cancelling coil 2, the prepositioning bracket and each hollow coil 10 are bent to form a uniformly symmetrical ring distribution on the same plane with the axial center.

[0085] Specifically, refer to Figures 1 to 11 as well as Figure 18As shown, the openable anti-vertical magnetic field interference inductor 100 in the first embodiment of the present invention. The output end includes a first output line 101 and a second output line 102. Both the first output line 101 and the second output line 102 are provided on the openable Rogowski coil. The first output line 101 is electrically connected to the connection end 1103 of the first Rogowski coil 11, and the second output line 102 is electrically connected to the connection end 1203 of the second Rogowski coil 12. The first output line 101 and the second output line 102 are twisted near the connection part 23 and output an electrical signal outward. With such a setting, the reclamation area surrounded by the vertical magnetic field cancellation coil 2 is certain. The first output line 101 and the second output line 102 are respectively electrically connected to the connection end 1103 of the first Rogowski coil 11 and the connection end 1203 of the second Rogowski coil 12. The first output line 101 and the second output line 102 can control the twisting tightness at a position close to (non-electrically contacting) the connection part 23, so that the connection part 23 matches the structure of the pair of output ends before twisting, which is beneficial to making the induced electromotive forces generated by both under the external magnetic field interference cancel each other, and further improving the detection accuracy of the openable anti-vertical magnetic field interference inductor 100. In this embodiment, the end 2112 of the first return line segment 211 is tightly electrically connected to the open end 1104 of the first Rogowski coil 11; the end 2212 of the second return line segment 221 is tightly electrically connected to the open end 1204 of the second Rogowski coil 12, so that the Rogowski coil and the vertical magnetic field cancellation coil 2 are connected in series. The coil start end 1101 of the first Rogowski coil 11 is electrically connected to the first output line 101, and the coil end 1102 of the first Rogowski coil 11 is electrically connected to the end 2112 of the first return line segment 211 of the vertical magnetic field cancellation coil 2; the coil start end 1201 of the second Rogowski coil 12 is electrically connected to the end 2212 of the second return line segment 221 of the vertical magnetic field cancellation coil 2, and the coil end 1202 of the second Rogowski coil 12 is electrically connected to the second output line 102.

[0086] Refer to Figures 12 to 18 As shown, the openable anti-vertical magnetic field interference inductor 200 in the second embodiment of the present invention. The output end includes a first output line 101' and a second output line 102'. The connection end 1103 of the first Rogowski coil 11 is electrically connected to the connection end 1203 of the second Rogowski coil 12 and is aligned with (non-electrically contacting) the connection part 23. Thus, the connection part between the connection ends 1103 and 1203 and the connection part 23 can better cancel each other's induced electromotive forces under the external electromagnetic interference. The first output line 101' is provided on one of the open ends 1104 and 1204 of the openable Rogowski coil. Figure 12 and Figure 14 and Figure 15Among them, the first output line 101' is electrically connected to the opening and closing end 1204 of the second Rogowski coil 12. The first return segment 211 and the second return segment 221 of the vertical magnetic field cancellation coil 2 respectively include head ends 2111, 2211 connecting both ends of the connecting portion 23 and end ends 2112, 2212 at the other ends of the head ends 2111, 2211. The second output line 102' is provided on one of the end ends 2112, 2212 of the vertical magnetic field cancellation coil 2 close to the first output line 101'. In Figure 12 , Figure 14 and Figure 15 among them, the second output line 102' is electrically connected to the end end 2212 of the second return segment 221. Thus, the first output line 101' and the second output line 102' are twisted with each other and output an electrical signal outward. With such a setting, the connecting portion 23 is aligned with the connection end 1103 of the first Rogowski coil 11 and the connection end 1203 of the second Rogowski coil 12, which can facilitate the mutual cancellation of the induced electromotive forces generated by the two under the interference of an external magnetic field. The first output line 101' and the second output line 102' can form a twisted structure at the position of the end end 2212 close to the vertical magnetic field cancellation coil 2, which can more accurately make the enclosed area surrounded by the entire opening and closing Rogowski coil equal to the enclosed area surrounded by the vertical magnetic field cancellation coil 2, thereby further improving the detection accuracy of the opening and closing type vertical magnetic field interference sensor 200. In other embodiments of the present invention, the first output line 101' and the second output line 102' can also be located at the opening and closing end 1104 of the first Rogowski coil 11 at the same time. The coil start end 1101 of the first Rogowski coil 11 is electrically connected to the coil end end 1202 of the second Rogowski coil 12 through a pivot connection portion 13; the coil end end 1102 of the first Rogowski coil 11 is electrically connected to the end end 2112 of the first return segment 211 of the vertical magnetic field cancellation coil 2; the coil start end 1201 of the second Rogowski coil 12 is electrically connected to the first output line 101'.

[0087] Refer Figure 13 as shown, the second output line 102' extends integrally from the end end 2212 of the vertical magnetic field cancellation coil 2. With such a setting, it can facilitate the manufacture and assembly of the vertical magnetic field cancellation coil 2 and the output end, and is conducive to the twisting of the first output line 101' and the second output line 102', facilitating the mutual cancellation of the induced electromotive forces. Refer Figure 14As shown, the connection end 1103 of the first Rogowski coil 11 is integrally connected (not shown) to the connection end 1203 of the second Rogowski coil 12 or electrically connected through the pivot end 13, enabling the first Rogowski coil 11 and the second Rogowski coil 12 to form an openable and closable ring. In the figure, the connection part between the connection end 1103 of the first Rogowski coil 11 and the connection end 1203 of the second Rogowski coil 12 is an arc-shaped pivot end 13. This facilitates the manufacturing and assembly of the first Rogowski coil 11 and the second Rogowski coil 12. The shape and position of the pivot end 13 and the connection part 23 are aligned. Thus, when affected by an external magnetic field interference, the induced electromotive forces generated by the pivot end 13 and the connection part 23 can cancel each other out.

[0088] As shown Figure 18 In a preferred embodiment of the present invention, each single hollow coil 10 of the Rogowski coil includes single coil layers 1001 that are continuously wound on a single coil jig (not shown) and arranged neatly according to wire diameters. After each single coil layer 1001 is wound, the next single coil layer 1001 is wound in the opposite direction on the outside. The adjacent single coil layers 1001 on the inside and outside are arranged neatly. The number of single coil layers 1001 is odd and ≥ 3 layers. After one hollow coil 10 is wound, the next identical hollow coil 10 is wound. With this arrangement, the wire diameter, number of turns, number of layers, inner diameter, and outer diameter of each single hollow coil 10 are consistent, ensuring the cancellation effect of electromagnetic interference between them and facilitating the continuous winding of the Rogowski coil.

[0089] The winding of the first Rogowski coil 11 and the second Rogowski coil 12 is continuously in the same direction, that is, the winding method of each hollow coil 10 in the first Rogowski coil 11 from the inside out and from left to right is the same as the winding method of each hollow coil 10 in the second Rogowski coil 12 from the inside out and from left to right, so as to Figure 4For example, the winding method of each hollow coil 10 of the first Rogowski coil 11 is to first wind the innermost first single coil layer 1001 from left to right, and then wind the second single coil layer 1001 from right to left outside the first single coil layer 1001, and repeat this back and forth; the winding method of each hollow coil 10 of the second Rogowski coil 12 is also to first wind the innermost first single coil layer 1001 from left to right, and then wind the second single coil layer 1001 from right to left outside the first single coil layer 1001, and repeat this back and forth. With such a setting, when the first Rogowski coil 11 and the second Rogowski coil 12 are assembled into the entire circular Rogowski coil, the winding methods of all hollow coils 10 are consistent; and both the first Rogowski coil 11 and the second Rogowski coil 12 are semicircularly distributed, and the spacing distance between each adjacent hollow coil 10 is less than 1-5% of the radius of the Rogowski coil. Since the gap between adjacent coils is a weak point for the penetration of external magnetic field interference, especially when the gap cannot be completely eliminated during mass production, the magnetic field will preferentially penetrate through the gap, destroying the condition of symmetric cancellation. For example, when the gap width reaches 5% of the coil diameter, the interference suppression ratio may drop by more than 20 dB; in addition, the gap causes the effective cross-sectional areas of adjacent coils to be unequal (the magnetic flux density on the gap side is higher), making the induced electromotive forces generated by the magnetic field no longer strictly equal and unable to be completely cancelled. With such a setting in the present invention, the phenomenon of magnetic leakage between adjacent hollow coils 10 can be avoided, and the detection accuracy and stability of the entire opening and closing type anti-vertical magnetic field interference inductor 100, 200 can be provided.

[0090] Reference Figures 6 to 8 、 Figure 16As shown, the openable anti-vertical magnetic field interference sensor 100, 200 further includes a first housing 61 for housing the first Rogowski coil 11 and the first loop segment 211, and a second housing 62 for housing the second Rogowski coil 12 and the second loop segment 221. The first housing 61 and the second housing 62 are symmetrically arranged and each includes a semi-circular annular bottom wall 611, 621, an inner wall 612, 622 extending laterally from the inner circle of the bottom wall 611, 621, and an inner wall 612, 622 extending laterally from the bottom wall 611, 621. The outer walls 613 and 623 extend laterally from the outer ring, and the end walls 614, 615, 624, and 625 connect the inner walls 612 and 622 with the outer walls 613 and 623 at both ends. The bottom walls 611 and 621, the inner walls 612 and 622, the outer walls 613 and 623, and the two end walls 614, 615, 624, and 625 form semi-open, semi-circular annular receiving cavities 616 and 626. The first Rogowski coil 11 and the second Rogowski coil 12 are respectively received in each of the receiving cavities 616 and 626. Within 16 and 626, the inner walls 612 and 622 are perforated to allow the primary current to pass through the center of the Rogowski coil, forming a primary current passage hole 630 for opening and closing to allow the primary current line to pass through the center of the Rogowski coil and the vertical magnetic field cancelling coil 2. The receiving cavities 616 and 626 are provided with coil positioning holes 618 and 628 for fixing each hollow coil 10. This arrangement prevents adjacent first Rogowski coils 11 from being directly connected. 11. The first loop segment 211 is short-circuited with the second Rogowski coil 1212 and the second loop segment 221221 respectively. After the first Rogowski coil 1111, the first loop segment 211, the second Rogowski coil 1212, and the second loop segment 221221 are respectively encapsulated in two housings, they can be easily opened and closed. This facilitates the installation of both around the primary current line or disconnected from the primary current line, making it convenient for the installation and maintenance of the openable anti-vertical magnetic field interference sensors 100 and 200. (See reference...) Figures 9 to 11 , Figure 17 As shown, the openable anti-vertical magnetic field interference sensors 100 and 200 further include a housing portion 7. The housing portion 7 includes an upper end shell 71 for housing the first housing 61 and a lower end shell 72 for housing the second housing 62. Both the upper end shell 71 and the lower end shell 72 are provided with a pivot portion 73 and an opening / closing portion 74. The pivot portions 73 are pivotally connected to each other and are close to the connecting portion 23. The opening / closing portions 74 can open and close together and are respectively used to house the opening / closing ends 1104 and 1204. The opening / closing portions 74 can be fastened with screws 75. The housing portion 7 has protruding portions 751 and 752 on its sides for housing the output ends. With this configuration, the housing portion 7 can house the first housing 61 and the second housing 62, and the first output line 101 and the second output line 102, after being twisted together, can extend out from the protruding portions 751 and 752 nearby. Figure 10As shown, in the first embodiment, the twisted first output line 101 and second output line 102 can extend from the outward protrusion 751 near the pivot portion 73, as shown in the figure. Figure 17 As shown, in the second embodiment, the first output line 101' and the second output line 102' after being twisted can extend out from the outward protrusion 752 away from the pivot 73. With this configuration, the outer shell 7 can be adapted to the output end structure of the first embodiment and also to the output end structure of the second embodiment.

[0091] The first and second housings 61 and 62 can be made of PC with glass fiber, PPS, or PEEK, and the Rogowski coil is encapsulated in epoxy resin within the receiving cavities 616 and 626. This provides the housings 61 and 62 with better strength, stability, and corrosion resistance, thereby extending the service life of the entire openable anti-vertical magnetic field interference sensor 100 and 200.

[0092] This invention also protects an electrical meter, including a housing and retractable anti-vertical magnetic field interference sensors 100 and 200 located within the housing. The core component of the electrical meter lies in the resistance to external magnetic field interference of the retractable anti-vertical magnetic field interference sensors 100 and 200. The ability of these sensors to resist external magnetic field interference enables the electrical meter to have excellent power data detection accuracy, giving it a core competitive advantage in the market.

[0093] This invention also protects a method for manufacturing an openable type anti-vertical magnetic field interference sensor 100, 200, for manufacturing the aforementioned openable type anti-vertical magnetic field interference sensor 100, 200, comprising: continuously winding enameled wire into a plurality of interconnected hollow coils 10, each hollow coil 10 comprising continuously winding single coil layers 1001 arranged in parallel according to wire diameter on a coil fixture, after each single coil layer 1001 is wound, the next single coil layer 1001 is wound in the opposite direction on the outside, adjacent inner and outer single coil layers 1001 are arranged in parallel, the number of single coil layers 1001 is odd and ≥3 layers;

[0094] On the next coil fixture that is vertically and horizontally offset from the coil fixture, the next hollow coil 10 is continuously wound.

[0095] Multiple coil jigs are arranged in a stepped manner and wound one by one. After the multiple hollow coils 10 are wound on the multiple coil jigs, they are removed from the coil jigs to complete the automated production of the first Rogowski coil 11 and / or the second Rogowski coil 12.

[0096] A vertical magnetic field cancelling coil 2 is provided, including an arc-shaped first loop segment 211, an arc-shaped second loop segment 221, and a connecting part 23 electrically connecting the first loop segment 211 and the second loop segment 221. The first loop segment 211 is inserted or held in the first prepositioning bracket 31 and inserted in the center of the annular channel 104 of the first Rogowski coil 11; the second loop segment 221 is inserted or held in the second prepositioning bracket 32 ​​and inserted in the center of the annular channel 104 of the second Rogowski coil 12.

[0097] The hollow coil 10, the first loop segment 211, the second loop segment 221, the first prepositioning bracket 31, and the second prepositioning bracket 32 ​​together form an openable ring, so that the multiple hollow coils 10 are symmetrically distributed on the same horizontal plane with the circle as the center. The holes 1002 together form an annular channel 104. The first loop segment 211 and the second loop segment 221 are located at the center of the annular channel 104, so that the reclamation area enclosed by the first loop segment 211 and the second loop segment 221 is equal to the reclamation area enclosed by the first and second Rogowski coils 11 and 12.

[0098] The output terminals are respectively located on the connection terminal 1103 of the first Rogowski coil 11 and the connection terminal 1203 of the second Rogowski coil 12, and are twisted together near the connection portion 23 to output signals outward; or the output terminals are respectively located on one of the open / closed ends 1104 and 1204 of the Rogowski coil and on one of the corresponding ends 2112 and 2212 of the vertical magnetic field cancellation coil 2, and are twisted together at the open / closed ends 1104 and 1204 to output signals outward, such as Figures 14 to 15 In this embodiment, the output terminals are respectively located on one of the open / closed ends 1204 of the Rogowski coil and the end 2212 of the vertical magnetic field cancellation coil 2. In other embodiments, the output terminals may also be respectively located on one of the open / closed ends 1104 of the Rogowski coil and the end 2112 of the vertical magnetic field cancellation coil 2.

[0099] With this configuration, the manufacturing method of the openable anti-vertical magnetic field interference sensors 100 and 200 can better maintain the consistency of the structure and distribution of each hollow coil 10. It can effectively utilize geometric symmetry and the series reverse connection of the vertical magnetic field cancellation coil 2 to achieve mutual cancellation of the induced electromotive force of the interfering magnetic field. When subjected to magnetic field interference perpendicular to the plane where the Rogowski coils are distributed, the vertical magnetic field cancellation coil 2 located at the center of the Rogowski coils can better cancel the induced electromotive force generated by the Rogowski coils themselves. Thus, the Rogowski coils and the vertical magnetic field cancellation coil 2 enable the openable anti-vertical magnetic field interference sensors 100 and 200 of this invention to perfectly cancel external magnetic field interference from all directions as a whole. This overcomes the current limitations of Rogowski coil applications and solves the problem of current ordinary Rogowski coils (not shown) being used for small current detection. The technical problem is that it is easily affected by external power frequency electromagnetic field interference, which leads to large measurement errors and fails to reflect the actual current. Furthermore, the first and second Rogowski coils 11 and 12, as well as the first circuit segment 211 and the second circuit segment 221, can be opened or closed synchronously as needed, which facilitates installation to or disconnection from the next current line, facilitates current monitoring or equipment maintenance of the running line, does not affect the continuity of power supply, and greatly reduces the complexity and safety risks of on-site operations. Moreover, the output terminal is located at the junction of the first Rogowski coil 11 and the second Rogowski coil 12 or at the end 2112 or 2212 of one of them, which can better achieve mutual cancellation of the induced electromotive force by controlling the tightness of the twisting of the output terminal, thereby improving the overall anti-magnetic field performance and detection accuracy of the openable anti-vertical magnetic field interference sensor 100 and 200.

[0100] It is worth noting that in this invention, the order of the above steps is not limited and can be adjusted according to the actual situation, all of which are within the protection scope of this invention.

[0101] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0102] The directional terms used in the various technical features described in the above embodiments, such as front, back, left, right, up, and down, are used only for the convenience of describing and understanding the various technical features, and do not constitute a limitation on specific directions in the actual use of the technical solution.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A switchable anti-vertical magnetic field interference sensor, characterized in that: The system includes a ring-shaped, openable Rogowski coil and an openable, ring-shaped vertical magnetic field cancelling coil located inside and connected in series with the Rogowski coil. The Rogowski coil comprises several self-adhesive hollow coils connected end-to-end. Each hollow coil has a hollow interior. The wire diameter, number of turns, number of layers, inner diameter, and outer diameter of each hollow coil are identical. There are an even number of hollow coils, symmetrically distributed around a circle on the same horizontal plane. The interiors together form a ring-shaped channel. The vertical magnetic field cancelling coil is located at the center of the ring-shaped channel. The area enclosed by the vertical magnetic field cancelling coil is equal to the area enclosed by the Rogowski coil. The openable Rogowski coil includes components capable of being assembled together. The system comprises a first and a second arc-shaped Rogowski coil forming a complete circular loop. The vertical magnetic field cancellation coil includes a first loop segment located within the annular channel of the first Rogowski coil, a second loop segment located within the annular channel of the second Rogowski coil, and a connecting portion electrically connecting the first and second loop segments. Both the first and second Rogowski coils include connecting ends and opening / closing ends located at both ends. The connecting ends of the first and second Rogowski coils are close to each other and aligned with the connecting portion of the vertical magnetic field cancellation coil. Together, they form a pair of output terminals for an opening / closing anti-vertical magnetic field interference sensor on the opening / closing Rogowski coil or on the opening / closing annular vertical magnetic field cancellation coil.

2. The openable / closing anti-vertical magnetic field interference sensor according to claim 1, characterized in that: The opening and closing Rogowski coil is fitted with a matching opening and closing pre-positioning bracket. The pre-positioning bracket is used to connect several hollow coils together in series. The pre-positioning bracket includes an arc-shaped first pre-positioning bracket and an arc-shaped second pre-positioning bracket. The first return segment is located in the first pre-positioning bracket and at the center of the annular channel of the first Rogowski coil. The second return segment is located in the second pre-positioning bracket and at the center of the annular channel of the second Rogowski coil.

3. The openable / closing anti-vertical magnetic field interference sensor according to claim 1, characterized in that: The output terminal includes a first output line and a second output line, both of which are disposed on the open-type Rogowski coil. The first output line is electrically connected to the connection terminal of the first Rogowski coil, and the second output line is electrically connected to the connection terminal of the second Rogowski coil. The first and second output lines are twisted together near the connection portion and output an electrical signal outward.

4. The openable / closing anti-vertical magnetic field interference sensor according to claim 1, characterized in that: The output terminal includes a first output line and a second output line. The first Rogowski coil connection terminal is electrically connected to the second Rogowski coil connection terminal and aligned with the connection portion. The first output line is located on one of the open / closed ends of the open / closed Rogowski coil. The first loop segment and the second loop segment of the vertical magnetic field cancellation coil respectively include a head end connecting the two ends of the connection portion and an end end located at the other end of the head end. The second output line is located on one of the ends of the vertical magnetic field cancellation coil near the first output line. The first output line and the second output line are twisted together and output an electrical signal.

5. The openable / closing anti-vertical magnetic field interference sensor according to claim 4, characterized in that: The second output line extends integrally from the end of the vertical magnetic field cancelling coil, and the connection end of the first Rogowski coil is integrally connected to the connection end of the second Rogowski coil or electrically connected through a pivot end.

6. The openable / closing anti-vertical magnetic field interference sensor according to claim 1, characterized in that: A single hollow coil comprises continuously winding single coil layers arranged neatly according to wire diameter on a coil fixture. After each single coil layer is wound, the next single coil layer is wound in the opposite direction on the outside. Adjacent inner and outer single coil layers are arranged neatly. The number of single coil layers is odd and ≥3 layers. After one hollow coil is wound, the next identical hollow coil is wound.

7. The openable / closing anti-vertical magnetic field interference sensor according to claim 1, characterized in that: The first Rogowski coil and the second Rogowski coil are wound in a continuous and unidirectional manner, and both are semi-circularly distributed. The spacing between each adjacent hollow coil is less than 1-5% of the radius of the Rogowski coil.

8. The openable / closing anti-vertical magnetic field interference sensor according to claim 1, characterized in that: The openable anti-vertical magnetic field interference sensor further includes a first housing for housing the first Rogowski coil and the first loop segment, and a second housing for housing the second Rogowski coil and the second loop segment. The first and second housings are symmetrically arranged and each includes a semi-circular annular bottom wall, an inner wall extending laterally from the inner circle of the bottom wall, an outer wall extending laterally from the outer circle of the bottom wall, and end walls at both ends connecting the inner and outer walls. The bottom wall, inner wall, outer wall, and end walls form a semi-open semi-circular annular receiving cavity. The first Rogowski coil and the second Rogowski coil are respectively housed in each of the receiving cavities. The inner wall passes through and surrounds the center of the Rogowski coil, forming a... The device includes a primary current passage hole for opening and closing, through which the primary current line passes from the center of the Rogowski coil and the vertical magnetic field cancellation coil. The housing cavity is provided with coil positioning holes for fixing each hollow coil. The openable vertical magnetic field interference sensor also includes a housing portion, which includes an upper end shell for housing the first housing and a lower end shell for housing the second housing. Both the upper and lower end shells are provided with a pivot portion and an opening and closing portion. The pivot portions are pivotally connected to each other and close to the connecting portion. The opening and closing portions can be opened and closed and are respectively used to house the opening and closing ends. The outer housing portion has an outwardly protruding portion on its side for housing the output end.

9. An electrical meter, characterized in that: It includes a power meter housing and an openable anti-vertical magnetic field interference sensor according to any one of claims 1 to 8 located inside the power meter housing.

10. A method for manufacturing an openable vertical magnetic field interference sensor, for manufacturing the openable vertical magnetic field interference sensor according to any one of claims 1 to 8, comprising: Multiple hollow coils are continuously wound from enameled wire and connected in series. Each hollow coil includes a single coil layer that is continuously wound on a coil fixture and arranged in a neat manner according to the wire diameter. After each single coil layer is wound, the next single coil layer is wound in the opposite direction on the outside. The adjacent inner and outer single coil layers are arranged neatly. The number of single coil layers is odd and ≥3 layers. On the next coil fixture that is vertically and horizontally offset from the coil fixture, the next hollow coil is continuously wound. Multiple coil jigs are arranged in a stepped manner and wound one by one. After the multiple hollow coils are wound on the multiple coil jigs, they are removed from the coil jigs to complete the automated production of the first Rogowski coil and / or the second Rogowski coil. A vertical magnetic field cancelling coil is provided, including an arc-shaped first loop segment, an arc-shaped second loop segment, and a connecting part that electrically connects the first loop segment and the second loop segment. The first loop segment is inserted or held in a first prepositioning bracket and inserted in the center of the annular channel of the first Rogowski coil; the second loop segment is inserted or held in a second prepositioning bracket and inserted in the center of the annular channel of the second Rogowski coil. The hollow coil, the first loop segment, the second loop segment, the first prepositioning bracket, and the second prepositioning bracket together form an openable ring, so that the multiple hollow coils are symmetrically distributed on the same horizontal plane with the circle as the center. The holes together form an annular channel. The first loop segment and the second loop segment are located at the center of the annular channel, so that the reclamation area enclosed by the first loop segment and the second loop segment is equal to the reclamation area enclosed by the first and second Rogowski coils. The output terminals are respectively located on the connection terminals of the first Rogowski coil and the second Rogowski coil, and are twisted together near the connection to output signals outward; or the output terminals are respectively located on one of the open / closed ends of the Rogowski coil and one of the corresponding ends of the vertical magnetic field cancelling coil, and are twisted together at the open / closed ends to output signals outward.

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