A retractable rigid Rogowski coil based on magnetic potential distribution calculation

Abstract

The present invention relates to the technical field of instruments and meters, and discloses an open-and-close rigid Rogowski coil based on magnetic potential distribution calculation. The coil comprises a first shell and a second shell that are coupled to each other to form a closed-loop structure. A first coil is provided in the first shell, a second coil is provided in the second shell, a first shielding coil is provided in the first shell, and a position of the first shielding coil in the first shell is set based on a magnetic potential distribution calculation method. When the first shell and the second shell are coupled to each other to form a closed-loop structure, corresponding side ends of the first coil and the second coil both extend into the first shielding coil. A second shielding coil is provided in the second shell, and a position of the second shielding coil in the second shell is set based on a magnetic potential distribution calculation method. When the first shell and the second shell are coupled to each other to form a closed-loop structure, corresponding side ends of the first coil and the second coil both extend into the second shielding coil. The present invention has the characteristics of high measurement accuracy and good anti-interference ability.

Description

Technical Field

[0001] The present invention relates to the technical field of instruments and meters, and in particular to an open-close rigid Rogowski coil based on magnetic potential distribution calculation. Background Art

[0002] In the existing technology, the devices used to measure current in AC circuits primarily include electromagnetic current transformers (CTs) using silicon steel sheets as the core material and electronic current transformers using Rogowski coils as the measuring element. While the technology behind electromagnetic current transformers using silicon steel sheets as the core material is highly mature, they struggle to meet current high-precision electrical measurement requirements due to issues such as core nonlinearity, core saturation at high currents, a limited effective range for high-precision measurements, low high-frequency current measurement accuracy, bulky size, and heavy weight. Rogowski coils, on the other hand, are hollow coils with a non-magnetic material as the coil skeleton. They offer advantages such as a simple structure, light weight, ease of processing, and simple insulation. Furthermore, Rogowski coils lack an iron core, exhibit no hysteresis, have virtually zero phase error, exhibit no residual magnetism, and exhibit no magnetic saturation effect. They offer a wide current measurement range, from tens of milliamperes to thousands of amperes, and a response bandwidth of 0.1 Hz to 1 MHz. They are primarily used in the high-current, high-frequency band power information field.

[0003] Rogowski coils are mainly divided into rigid Rogowski coils and flexible Rogowski coils based on their skeleton materials. Flexible Rogowski coils are very convenient to install and use, but their structural shape means they cannot have the accuracy in the low-frequency and small current fields. They can only be used for qualitative measurement or detection of high-frequency current and large current. The accuracy and measurement stability of rigid Rogowski coils are significantly better than those of flexible Rogowski coils. Therefore, they are more widely used in the market.

[0004] Rigid Rogowski coils can be categorized as closed and open-type based on their operating mode. Traditional closed-type rigid Rogowski coils have a maximum measurement accuracy of 0.2s, comparable to that of traditional CTs. However, due to their closed loop nature, their application scenarios are limited. Open-type rigid Rogowski coils, on the other hand, offer excellent adaptability due to their flexible opening and closing capabilities. Properly utilized, they can effectively detect leakage in overhead lines. However, traditional open-type rigid Rogowski coils suffer from low measurement accuracy and poor anti-interference capabilities due to structural and shielding design deficiencies. This makes it prone to significant deviations in overall measurement values ​​when using open-type rigid Rogowski coils. Summary of the Invention

[0005] In view of this, the present invention provides an open-close rigid Rogowski coil based on magnetic potential distribution calculation.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows: In a first aspect, a method for calculating the magnetic potential distribution of an open-close rigid Rogowski coil comprises the following steps:

[0007] Calculate the coordinates of any point on the inner diameter of the coil, the coordinates of any point on the outer diameter of the coil and the magnetic potential distribution path vector of the coil;

[0008] Calculate the magnetic field intensity vector of the inner diameter current of the coil at a certain point in the coil, the magnetic field intensity vector of the outer diameter current of the coil at a certain point in the coil, and the magnetic voltage drop distribution generated by the inner diameter current and the outer diameter current of the coil on a certain path;

[0009] The magnetic potential distribution and magnetic field leakage at any point on the coil frame surface are obtained based on the magnetic voltage drop distribution to determine the accuracy and anti-interference performance of the coil;

[0010] Obtain the magnetic potential distribution diagram of the surface of the densely and evenly wound circular skeleton Rogowski coil and the magnetic potential distribution diagram of the surface of the circular skeleton Rogowski coil with uneven winding or winding gaps. By comparing the magnetic potential distribution diagrams, determine the position where the magnetic potential distribution difference of the coil is the largest.

[0011] Furthermore, the calculation formula for calculating the coordinates of any point on the inner diameter of the coil is:

[0012]

[0013] The calculation formula for calculating the coordinates of any point on the outer diameter of the coil is:

[0014]

[0015] The calculation formula for calculating the magnetic potential distribution path vector of the coil is:

[0016]

[0017] Among them, Ri represents the inner diameter of the coil, Ro represents the outer diameter of the coil, and xi k represents the x-axis coordinate of the inner diameter of the coil, yi k Represents the y-axis coordinate of the coil inner diameter, xo k Represents the x-axis coordinate of the coil outer diameter, yo k Represents the y-axis coordinate of the outer diameter of the coil, k = 1, 2, 3, ..., N, l(θ) represents the magnetic potential distribution path vector of the coil, r∈(0,Ri)∩(Ro,+∞), and r is any value in this interval.

[0018] Furthermore, the calculation formula for calculating the magnetic field intensity vector of the coil inner diameter current at a certain point in the coil is:

[0019]

[0020] The calculation formula for calculating the magnetic field intensity vector of the coil outer diameter current at a certain point in the coil is:

[0021]

[0022] The calculation formula for calculating the magnetic voltage drop distribution generated by the inner diameter current and outer diameter current of the coil on a certain path is:

[0023]

[0024] Among them, H i (x, y) represents the magnetic field intensity vector of the coil inner diameter current at the point (x, y) inside the coil, H o (x, y) represents the magnetic field intensity vector of the coil outer diameter current at the point (x, y) inside the coil, U m (θ) represents the magnetic voltage drop distribution generated by the inner diameter current and outer diameter current of the coil on a certain path, I represents the inner diameter current of the coil, -I represents the intensity of the outer diameter current of the coil, x represents the x-axis coordinate of the calculated point in the coil, y represents the y-axis coordinate of the calculated point in the coil, l(θ) represents the magnetic potential distribution path vector of the coil, r∈(0,Ri)∩(Ro,+∞), and r is any value in this interval.

[0025] In a second aspect, the present invention provides an open-and-close rigid Rogowski coil based on magnetic potential distribution calculation, comprising a first shell and a second shell that are mutually coupled to form a closed loop structure, wherein a first plug-in block is provided on one end of the first shell and a first plug-in slot is provided on the other end thereof, and a second plug-in block is provided on one end of the second shell and a second plug-in slot is provided on the other end thereof. When the first shell and the second shell are mutually coupled to form the closed loop structure, the first plug-in block is plugged into the second plug-in slot, and the second plug-in block is plugged into the first plug-in slot.

[0026] A first coil is provided in the first shell, and a second coil is provided in the second shell. When the first shell and the second shell are aligned with each other to form a closed loop structure, the two ends of the first coil and the corresponding side ends of the second coil are close to each other, and the corresponding side ends of the first coil enter the second insertion slot, and the corresponding side ends of the second coil enter the first insertion slot;

[0027] A first shielding coil is provided in the first shell, and the position of the first shielding coil in the first shell is set based on the magnetic potential distribution calculation method. When the first shell and the second shell are aligned with each other to form a closed loop structure, the corresponding side ends of the first coil and the second coil both extend into the first shielding coil. A second shielding coil is provided in the second shell, and the position of the second shielding coil in the second shell is set based on the magnetic potential distribution calculation method. When the first shell and the second shell are aligned with each other to form a closed loop structure, the corresponding side ends of the first coil and the second coil both extend into the second shielding coil.

[0028] A first shielding ring is also provided in the first shell, wherein one end of the first shielding ring is connected to the first coil, and the other end surrounds the outer ring portion of the first coil and then passes into the first shielding coil, and the end position of the first shielding ring connected to the first coil is set to meet the requirement that when the first shell and the second shell are matched with each other to form a closed loop structure, the connection end of the first shielding ring and the first coil is located in the second shielding coil. A second shielding ring is also provided in the second shell, wherein one end of the second shielding ring is connected to the second coil, and the other end surrounds the outer ring portion of the second coil and then passes into the second shielding coil, and the end position of the second shielding ring connected to the second coil is set to meet the requirement that when the first shell and the second shell are matched with each other to form a closed loop structure, the connection end of the second shielding ring and the second coil is located in the first shielding coil.

[0029] Furthermore, a first output block is provided on the outer ring wall of the first shell, and the end of the first shielding ring that penetrates into the first shielding coil continues to penetrate into the first output block; a second output block is provided on the outer ring wall of the second shell, and the end of the second shielding ring that penetrates into the second shielding coil continues to penetrate into the second output block.

[0030] Furthermore, symmetrically arranged connecting plates are provided below the first shell and the second shell, and brackets are provided below the connecting plates on both sides. The bottoms of the connecting plates on both sides are fixedly connected to the brackets. A first torsion spring rotating shaft and a second torsion spring rotating shaft are provided between the connecting plates on both sides. Both ends of the first torsion spring rotating shaft and the second torsion spring rotating shaft are rotatably connected to the corresponding side connecting plates. A first connecting block is provided on the outer ring wall of the first shell, and the first connecting block is fixed to the first torsion spring rotating shaft. A second connecting block is provided on the outer ring wall of the second shell, and the second connecting block is fixed to the second torsion spring rotating shaft. When the first torsion spring rotating shaft and the second torsion spring rotating shaft are in normal state, the first shell and the second shell present an open structure.

[0031] Furthermore, a first connecting ring is provided on the inner ring wall of the first shell, and a second connecting ring is provided on the inner ring wall of the second shell. A horizontally arranged elastic rope is provided between the first connecting ring and the second connecting ring, and both ends of the elastic rope are respectively connected to the first connecting ring and the second connecting ring on the corresponding side.

[0032] Furthermore, a first pull plate arranged obliquely downward is fixedly connected to the first torsion spring rotating shaft, and a second pull plate arranged obliquely downward is fixedly connected to the second torsion spring rotating shaft. The first pull plate and the second pull plate are arranged symmetrically. A pull rope is provided below the first pull plate and the second pull plate. One end of the pull rope is forked, and the forked ends of the pull rope are respectively connected to the first pull plate and the second pull plate, and the other end is extended vertically downward.

[0033] In the third aspect, the present invention provides an overhead line measuring device, including a support rod, a base of a vertically arranged electric telescopic rod is provided on the top of the support rod, a placing table is provided on the telescopic rod end of the electric telescopic rod, a plurality of the open and close rigid Rogowski coils are provided on the top surface of the placing table, and a side wall of one side of the placing table is also provided with a number of transmission motors adapted to the open and close rigid Rogowski coils, one transmission motor corresponds to one open and close rigid Rogowski coil, and the electric spindles of all transmission motors are connected to the ends of the pull ropes extending vertically downward on the corresponding open and close rigid Rogowski coils. An intelligent controller is also provided on the support rod, and the intelligent controller is electrically connected to the electric telescopic rod, the open and close rigid Rogowski coil and the transmission motor respectively. The intelligent controller can control the operation of the electric telescopic rod, read the data measured by the open and close rigid Rogowski coil and control the operation of the transmission motor.

[0034] Furthermore, a slide rail is provided on the top surface of the placing table, and a number of pulley frames corresponding to the open and close rigid Rogowski coils are provided inside the slide rail, and one pulley frame corresponds to one open and close rigid Rogowski coil, and the bottom of the bracket of the open and close rigid Rogowski coil is connected to the corresponding pulley frame, and a pulley assembly is provided inside the pulley frame, and the pulley frame is slidably connected to the slide rail through the pulley assembly, and the pulley frame is also provided with a driving motor for driving the pulley assembly to slide along the slide rail, the driving motor is electrically connected to the intelligent controller, and the intelligent controller can control the operation of the driving motor, and a connecting channel connected to the slide rail is also provided on one side wall of the placing table, and a number of sliders corresponding to the pulley frame are slidably connected in the connecting channel, and one slider corresponds to a pulley frame, one end of all sliders extends into the slide rail and is fixedly connected to the corresponding pulley frame, and all transmission motors are connected to the other end of the slider connected to the pulley frame corresponding to the open and close rigid Rogowski coil.

[0035] Compared with the prior art, the advantages of the present invention are:

[0036] 1. The present invention provides a method for calculating the magnetic potential distribution of an open-and-closed rigid Rogowski coil, which can analyze and determine the reasons for the poor measurement accuracy of the open-and-closed rigid Rogowski coil in existing technologies. This allows targeted processing to be performed based on the calculated magnetic field leakage amount and magnetic field leakage location of the open-and-closed rigid Rogowski coil, thereby minimizing the impact of external interference magnetic fields on the measurement accuracy of the open-and-closed rigid Rogowski coil, thereby improving the measurement accuracy of the open-and-closed rigid Rogowski coil.

[0037] 2. The present invention provides an open-and-close rigid Rogowski coil based on magnetic potential distribution calculation. A first shielding coil, a second shielding coil, a first shielding ring, and a second shielding ring are added to the open-and-close rigid Rogowski coil according to the magnetic field leakage amount and magnetic field leakage position of the open-and-close rigid Rogowski coil obtained by the magnetic potential distribution calculation method. The arrangement of the first shielding layer and the second shielding layer can effectively shield external phase and axial magnetic field interference and electric field interference, compensate for the magnetic field leakage problem caused by uneven winding due to the opening and closing of the coil, and effectively reduce the coupling of the coil with the external magnetic field through the opening and closing gap. The arrangement of the first shielding ring and the second shielding ring can reduce the interference of the high-voltage electric field on the coil output voltage, and form an equipotential in a surrounding form. Compared with the existing technology, it has the advantage of high measurement accuracy.

[0038] 3. The present invention provides an overhead line measuring device, which measures the overhead line by setting a support rod, an electric telescopic rod, or combining an open and close rigid Rogowski coil with a carrier such as a drone in the prior art. Compared with traditional detection devices that are permanently installed on overhead lines, the device is not only low in cost but also can be measured on the go as needed, and is highly flexible in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 Schematic diagram of the magnetic potential distribution path of the coil in the present invention;

[0041] Figure 2 The magnetic potential distribution diagram of the surface of the densely and evenly wound circular skeleton Rogowski coil of the present invention;

[0042] Figure 3 The magnetic potential distribution diagram of the surface of the circular skeleton Rogowski coil with winding gap in the present invention;

[0043] Figure 4 This is a structural diagram of Example 1;

[0044] Figure 5 This is the enlarged view of point A;

[0045] Figure 6 This is an enlarged view of point B;

[0046] Figure 7 This is a first structural diagram of Example 2;

[0047] Figure 8 This is a second structural diagram of Example 2;

[0048] Figure 9 This is a first structural diagram of Example 3;

[0049] Figure 10 This is a second structural diagram of Example 3;

[0050] Figure 11 This is a schematic structural diagram of Example 4;

[0051] Figure 12 This is a schematic structural diagram of Example 5;

[0052] Figure 13 This is a schematic structural diagram of Example 6;

[0053] Figure 14 A top view of the placement table in Example 6;

[0054] Figure 15 This is a schematic structural diagram of Example 7;

[0055] Figure 16 This is a top view of the placement table in Example 7.

[0056] Figure numerals: 1. first shell; 2. second shell; 3. first plug-in block; 4. first plug-in slot; 5. second plug-in block; 6. second plug-in slot; 7. first coil; 8. second coil; 9. first shielding coil; 10. second shielding coil; 11. first shielding ring; 12. second shielding ring; 13. first output block; 14. second output block; 15. connecting plate; 16. bracket; 17. first torsion spring; 18. second torsion spring; 19. first connecting block; 20. second connecting block; 21. first connecting ring; 22. second connecting ring; 23. elastic rope; 24. first pull plate; 25. second pull plate; 26. pull rope; 27. support rod; 28. electric telescopic rod; 29. ​​placing table; 30. transmission motor; 31. slide rail; 32. pulley frame; 33. drive motor; 34. connecting channel; 35. slider; m, overhead line. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0058] The present invention provides a method for calculating the magnetic potential distribution of an open-close rigid Rogowski coil, comprising the following steps:

[0059] Calculate the coordinates of any point on the inner diameter of the coil, the coordinates of any point on the outer diameter of the coil and the magnetic potential distribution path vector of the coil;

[0060] The calculation formula for calculating the coordinates of any point on the inner diameter of the coil is:

[0061]

[0062] The calculation formula for calculating the coordinates of any point on the outer diameter of the coil is:

[0063]

[0064] The calculation formula for the magnetic potential distribution path vector of the coil is:

[0065]

[0066] Among them, Ri represents the inner diameter of the coil, Ro represents the outer diameter of the coil, and xi k represents the x-axis coordinate of the inner diameter of the coil, yi k Represents the y-axis coordinate of the coil inner diameter, xo k Represents the x-axis coordinate of the coil outer diameter, yo k Represents the y-axis coordinate of the outer diameter of the coil, k = 1, 2, 3, ..., N, l(θ) represents the magnetic potential distribution path vector of the coil, r∈(0,Ri)∩(Ro,+∞), r is any value in this interval;

[0067] The coil magnetic potential distribution path diagram can be drawn based on the calculation results, as shown in the following figure: Figure 1 As shown; for subsequent judgment and use;

[0068] Calculate the magnetic field intensity vector of the inner diameter current of the coil at a certain point in the coil, the magnetic field intensity vector of the outer diameter current of the coil at a certain point in the coil, and the magnetic voltage drop distribution generated by the inner diameter current and the outer diameter current of the coil on a certain path;

[0069] The calculation formula for calculating the magnetic field intensity vector of the coil inner diameter current at a certain point in the coil is:

[0070]

[0071] The calculation formula for calculating the magnetic field intensity vector of the coil outer diameter current at a certain point in the coil is:

[0072]

[0073] The calculation formula for calculating the magnetic voltage drop distribution generated by the inner diameter current and outer diameter current of the coil on a certain path is:

[0074]

[0075] Among them, Hi (x,y) represents the magnetic field intensity vector of the coil inner diameter current at the x, y point inside the coil, H o (x, y) represents the magnetic field intensity vector of the coil outer diameter current at the x, y point inside the coil, U m (θ) represents the magnetic voltage drop distribution generated by the inner diameter current and outer diameter current of the coil on a certain path, I represents the inner diameter current of the coil, -I represents the current intensity of the outer diameter of the coil, x represents the x-axis coordinate of the calculated point in the coil, y represents the y-axis coordinate of the calculated point in the coil, l(θ) represents the magnetic potential distribution path vector of the coil, r∈(0,Ri)∩(Ro,+∞), r is any value in this interval

[0076] The magnetic potential distribution and magnetic field leakage at any point on the coil frame surface are obtained based on the magnetic voltage drop distribution to determine the accuracy and anti-interference performance of the coil;

[0077] Then, the magnetic potential distribution diagram of the surface of the densely and evenly wound circular skeleton Rogowski coil and the magnetic potential distribution diagram of the surface of the circular skeleton Rogowski coil with uneven winding or winding gaps are obtained, such as Figure 2 and Figure 3 shown; according to Figure 2 It can be seen that the magnetic potential difference on the surface of the uniform and dense circular skeleton Rogowski coil is basically less than 4pA / m. Therefore, the magnetic potential distribution characteristics on the surface of the closed and uniformly wound Rogowski coil are basically consistent with its high precision characteristics. Figure 3 It can be seen that the winding gap 0° position at the winding inlet and outlet is the place where the magnetic potential distribution of the entire coil has the largest drop, reaching 0.3A / m, that is, the place where the magnetic field leakage is the largest. Figure 2 and Figure 3 By comparing and determining the position where the magnetic potential distribution difference of the coil is the largest, it can be seen that reducing the magnetic field leakage problem at the opening is the key to achieving high precision of the open and close rigid Rogowski coil.

[0078] Example 1: Please refer to Figures 4-6 This embodiment provides an open-and-close rigid Rogowski coil based on magnetic potential distribution calculation, comprising a first shell 1 and a second shell 2 that are coupled to each other to form a closed loop structure. A first plug-in block 3 is provided on one end of the first shell 1, and a first plug-in slot 4 is defined on the other end. A second plug-in block 5 is provided on one end of the second shell 2, and a second plug-in slot 6 is defined on the other end. When the first shell 1 and the second shell 2 are coupled to each other to form a closed loop structure, the first plug-in block 3 is plugged into the second plug-in slot 6, and the second plug-in block 5 is plugged into the first plug-in slot 4.

[0079] A first coil 7 is provided in the first shell 1, and a second coil 8 is provided in the second shell 2. In this embodiment, the first coil 7 and the second coil 8 are both manufactured using a distributed return turn winding method to ensure the uniformity and density of the coil winding, achieve a large mutual inductance between the coil and the through-current, and effectively reduce interference from the external transverse magnetic field; when the first shell 1 and the second shell 2 are aligned with each other to form a closed loop structure, the two ends of the first coil 7 and the corresponding side ends of the second coil 8 are close to each other, and the corresponding side ends of the first coil 7 enter the second plug-in slot 6, and the corresponding side ends of the second coil 8 enter the first plug-in slot 4;

[0080] A first shielding coil 9 is provided in the first shell 1. The position of the first shielding coil 9 in the first shell 1 is determined based on the aforementioned magnetic potential distribution calculation method. When the first shell 1 and the second shell 2 are aligned to form a closed loop structure, the corresponding side ends of the first coil 7 and the second coil 8 both extend into the first shielding coil 9. A second shielding coil 10 is provided in the second shell 2. The position of the second shielding coil 10 in the second shell 2 is determined based on the aforementioned magnetic potential distribution calculation method. When the first shell 1 and the second shell 2 are aligned to form a closed loop structure, the corresponding side ends of the first coil 7 and the second coil 8 both extend into the second shielding coil 10. The provision of the first shielding coil 9 and the second shielding coil 10 can cover the gap between the two ends of the first coil 7 and the corresponding side ends of the second coil 8 when the first shell 1 and the second shell 2 are aligned to form a closed loop structure, thereby effectively shielding external interphase and axial magnetic field interference and electric field interference, compensating for the magnetic field leakage problem caused by uneven winding due to the opening and closing of the coils, and effectively reducing the coupling of the coils with the external magnetic field through the opening and closing gaps.

[0081] A first shielding ring 11 is further provided in the first shell 1. One end of the first shielding ring 11 is connected to the first coil 7, and the other end surrounds the outer ring portion of the first coil 7 and then penetrates into the first shielding coil 9. The position of the end of the first shielding ring 11 connected to the first coil 7 is set to meet the requirement that when the first shell 1 and the second shell 2 are matched with each other to form a closed loop structure, the connection end of the first shielding ring 11 and the first coil 7 is located inside the second shielding coil 10. A second shielding ring 12 is further provided in the second shell 2. One end of the second shielding ring 12 is connected to the second coil 8, and the other end surrounds the outer ring portion of the second coil 8 and then penetrates into the second shielding coil 10. The position of the end of the second shielding ring 12 connected to the second coil 8 is set to meet the requirement that when the first shell 1 and the second shell 2 are matched with each other to form a closed loop structure, the connection end of the second shielding ring 12 and the second coil 8 is located inside the first shielding coil 9. By providing the first shielding ring 11 and the second shielding ring 12, an equipotential is formed by the surrounding form, so as to reduce the interference of the high-voltage electric field on the coil output voltage.

[0082] A first output block 13 is provided on the outer ring wall of the first shell 1, and the end of the first shielding ring 11 that penetrates into the first shielding coil 9 continues to penetrate into the first output block 13. A second output block 14 is provided on the outer ring wall of the second shell 2, and the end of the second shielding ring 12 that penetrates into the second shielding coil 10 continues to penetrate into the second output block 14. The first output block 13 and the second output block 14 are configured to output voltage signals.

[0083] In order to facilitate the use of the open and close rigid Rogowski coil provided in Example 1, Examples 2 and 3 are proposed;

[0084] Example 2: Please refer to Figure 7 and Figure 8 The present embodiment provides an open-and-close rigid Rogowski coil based on magnetic potential distribution calculation, including all the structures in Example 1, and also including a connecting plate 15, which is symmetrically distributed below the first shell 1 and the second shell 2, and a vertically arranged bracket 16 is provided below the connecting plates 15 on both sides. The bottoms of the connecting plates 15 on both sides are fixed to the bracket 16, and a first torsion spring rotating shaft 17 and a second torsion spring rotating shaft 18 are provided between the connecting plates 15 on both sides. Both ends of the first torsion spring rotating shaft 17 and the second torsion spring rotating shaft 18 are rotatably connected to the corresponding side connecting plates 15, a first connecting block 19 is provided on the outer ring wall of the first shell 1, and the first connecting block 19 is fixed to the first torsion spring rotating shaft 17, a second connecting block 20 is provided on the outer ring wall of the second shell 2, and the second connecting block 20 is fixedly connected to the second torsion spring shaft 18. When the first torsion spring shaft 17 rotates, it can drive the first connecting block 19 to rotate, thereby driving the first shell 1 to rotate. When the second torsion spring shaft 18 rotates, it can drive the second shell 2 to rotate by driving the second connecting block 20. At the same time, when the first torsion spring shaft 17 and the second torsion spring shaft 18 are in normal state, they can make the first shell 1 and the second shell 2 present an open structure; a first connecting ring 21 is provided on the inner ring wall of the first shell 1, and a second connecting ring 22 is provided on the inner ring wall of the second shell 2. A horizontally arranged elastic rope 23 is provided between the first connecting ring 21 and the second connecting ring 22, and the two ends of the elastic rope 23 are respectively connected to the first connecting ring 21 and the second connecting ring 22 on the corresponding sides.

[0085] With the above arrangement, when measuring the overhead line m, the retractable rigid Rogowski coil first moves the first shell 1 and the second shell 2 so that the overhead line m is between the first shell 1 and the second shell 2 and above the elastic cord 23. Then, by pushing the bracket 16 upward, the elastic cord 23 squeezes the overhead line m, causing the elastic cord 23 to deform. This pulls the first connecting ring 21 and the second connecting ring 22 to drive the first shell 1 and the second shell 2 to rotate about the first torsion spring shaft 17 and the second torsion spring shaft 18, so that the first shell 1 and the second shell 2 are aligned with each other to form a closed loop structure, thereby measuring the voltage of the overhead line m between the first shell 1 and the second shell 2. After the measurement is completed, the upward thrust applied to the bracket 16 is removed, and the first shell 1 and the second shell 2 form an open structure under the resetting action of the first torsion spring shaft 17 and the second torsion spring shaft 18. At this time, the retractable rigid Rogowski coil can be removed from the overhead line m.

[0086] To ensure the measurement effect, the setting of the elastic rope 23 satisfies that when the bracket 16 is pushed upward and the elastic rope 23 pulls the first shell 1 and the second shell 2 to form a closed loop structure, the center of the closed loop structure formed by the first shell 1 and the second shell 2 can be concentric with the center of the overhead line m to ensure the measurement effect.

[0087] The retractable rigid Rogowski coil can be combined with carriers such as a telescopic rod structure and a drone structure commonly used in the prior art to be raised to a high altitude for detecting high-altitude lines.

[0088] Example 3: Please refer to Figure 9 and Figure 10, this embodiment provides an open and close rigid Rogowski coil based on magnetic potential distribution calculation, including all the structures in Example 1, and also including a connecting plate 15, the connecting plates 15 are symmetrically distributed below the first shell 1 and the second shell 2, and a vertically arranged bracket 16 is provided below the connecting plates 15 on both sides, and the bottoms of the connecting plates 15 on both sides are fixed to the bracket 16, and a first torsion spring rotating shaft 17 and a second torsion spring rotating shaft 18 are provided between the connecting plates 15 on both sides, and both ends of the first torsion spring rotating shaft 17 and the second torsion spring rotating shaft 18 are rotatably connected to the corresponding side connecting plates 15, a first connecting block 19 is provided on the outer ring wall of the first shell 1, and the first connecting block 19 is fixed to the first torsion spring rotating shaft 17, a second connecting block 20 is provided on the outer ring wall of the second shell 2, and the second connecting block 20 is fixed to the second torsion spring rotating shaft 18, and the first torsion spring rotating shaft 17 can be rotated by The first connecting block 19 is driven to rotate, thereby driving the first shell 1 to rotate. When the second torsion spring shaft 18 is rotated, it can drive the second shell 2 to rotate by driving the second connecting block 20. At the same time, when the first torsion spring shaft 17 and the second torsion spring shaft 18 are in normal state, the first shell 1 and the second shell 2 can be in an open structure; the first torsion spring shaft 17 is also fixedly connected to a first pull plate 24 that is tilted downward, and the second torsion spring shaft 18 is also fixedly connected to a second pull plate 25 that is tilted downward. The first pull plate 24 and the second pull plate 25 are symmetrically arranged with the center line of the bracket 16 as the center of symmetry. A pull rope 26 is provided below the first pull plate 24 and the second pull plate 25. One end of the pull rope 26 is forked, and the forked ends of the pull rope 26 are respectively connected to the first pull plate 24 and the second pull plate 25, and the other end is extended vertically downward.

[0089] Through the above-mentioned arrangement, when the open-close rigid Rogowski coil is measuring the overhead line m, the first shell 1 and the second shell 2 are first moved to position so that the overhead line m is between the first shell 1 and the second shell 2 and above the elastic rope 23, and then the end of the pull rope 26 extending vertically downward is pulled downward. The pull rope 26 can drive the movement of the first pull plate 24 and the second pull plate 25 to drive the rotation of the first torsion spring shaft 17 and the second torsion spring shaft 18, so that the first shell 1 and the second shell 2 are driven by the first connecting block 19 and the second connecting block 20 to engage with each other. By forming a closed-loop structure, the voltage of the overhead line m between the first shell 1 and the second shell 2 can be measured; after the measurement is completed, after the downward pulling force applied to the pull rope 26 is removed, the first shell 1 and the second shell 2 will form an open structure under the resetting action of the first torsion spring shaft 17 and the second torsion spring shaft 18. At this time, the open-and-close rigid Rogowski coil can be removed from the overhead line m; it should be noted that after the first shell 1 and the second shell 2 form a closed-loop structure, the center of the closed-loop structure should be set concentrically with the center of the overhead line m as much as possible to ensure the measurement effect.

[0090] The retractable rigid Rogowski coil can be combined with carriers such as a telescopic rod structure and a drone structure commonly used in the prior art to be raised to a high altitude for detecting high-altitude lines.

[0091] In order to further facilitate users to use the open and close rigid Rogowski coil to measure the overhead line m, based on Example 2, Example 4 is proposed;

[0092] Example 4: Please refer to Figure 11 The present embodiment provides an overhead line measuring device, comprising a support rod 27, wherein a base of a vertically arranged electric telescopic rod 28 is provided at the top of the support rod 27, and a placement table 29 is provided on the telescopic rod end of the electric telescopic rod 28. The retractable rigid Rogowski coil provided in Example 2 is connected to the top surface of the placement table 29 through the bottom of the bracket 16 and is thus arranged on the top surface of the placement table 29. In the present embodiment, the number of the retractable rigid Rogowski coils is 4, so as to be able to measure the voltage of the three-phase and one-ground overhead line m structure; an intelligent controller is also provided on the support rod 27, and the intelligent controller is electrically connected to the electric telescopic rod 28 and the retractable rigid Rogowski coil respectively. The intelligent controller can control the operation of the electric telescopic rod 28, and read the data measured by the retractable rigid Rogowski coil by converting the voltage output by the first output block 13 and the second output block 14;

[0093] Through the above-mentioned arrangement, the user moves the measuring device to a suitable position by holding the support rod 27, and then uses the intelligent controller to control the electric telescopic rod 28 to start working, so that the electric telescopic rod 28 raises the height of the openable and retractable rigid Rogowski coil by raising the height of the placement table 29, so that the overhead line m whose voltage needs to be measured enters the first shell 1 and the second shell 2 of the openable and retractable rigid Rogowski coil. Thereafter, the electric telescopic rod 28 continues to raise the height of the openable and retractable rigid Rogowski coil, so that the elastic rope 23 squeezes the overhead line m. At this time, the elastic rope 23 squeezes the overhead line m, thereby pulling the first shell 1 and the second shell 2 closed, so that the voltage of the overhead line m between the first shell 1 and the second shell 2 can be measured, and the user can read the measured voltage value by using the intelligent controller.

[0094] In order to further facilitate users to use the open and close rigid Rogowski coil to measure the overhead line m, based on Example 3, Example 5 is proposed;

[0095] Example 5: Please refer to Figure 12The present embodiment provides an overhead line measuring device, including a support rod 27, a base of a vertically arranged electric telescopic rod 28 is provided on the top of the support rod 27, and a placement table 29 is provided on the telescopic rod end of the electric telescopic rod 28. The open and close rigid Rogowski coil provided in Example 3 is connected to the top surface of the placement table 29 through the bottom of the bracket 16 and is thus arranged on the top surface of the placement table 29. In this embodiment, the number of the open and close rigid Rogowski coils is 4, so that the voltage of the three-phase and one-ground overhead line m structure can be measured; a transmission motor 30 corresponding in number to the open and close rigid Rogowski coils is further provided on one side wall of the placement table 29. Each transmission motor 30 corresponds to an open-close rigid Rogowski coil. The electric spindles of all transmission motors 30 are connected to the ends of the pull ropes 26 extending vertically downward from the corresponding open-close rigid Rogowski coils. The support rod 27 is also provided with an intelligent controller, which is electrically connected to the electric telescopic rod 28, the open-close rigid Rogowski coils, and the transmission motors 30. The intelligent controller can control the operation of the electric telescopic rod 28, read the data measured by the open-close rigid Rogowski coils by receiving the voltage output by the first output block 13 and the second output block 14, and control the operation of the transmission motors 30.

[0096] Through the above-mentioned setting, the user moves the measuring device to a suitable position by holding the support rod 27, and then uses the intelligent controller to control the electric telescopic rod 28 to start working, so that the electric telescopic rod 28 raises the height of the opening and closing rigid Rogowski coil by raising the height of the placement table 29, so that the overhead line m whose voltage needs to be measured enters the first shell 1 and the second shell 2 of the opening and closing rigid Rogowski coil. Then, the user starts working by controlling the transmission motor 30. The transmission motor 30 rotates through the electric main shaft to generate a downward pulling force on the pull rope 26, thereby pulling the first shell 1 and the second shell 2 closed, and the voltage of the overhead line m between the first shell 1 and the second shell 2 can be measured. The user can read the measured voltage value by using the intelligent controller.

[0097] In order to be able to measure the three-phase and one-ground overhead line m structure with various spacings, Example 6 is proposed based on Example 4;

[0098] Example 6: Please refer to Figure 13 and Figure 14The present embodiment provides an overhead line measuring device, including all the structures in Example 4. Furthermore, a slide rail 31 is provided on the top surface of the placement table 29. The layout direction of the slide rail 31 is adapted to the layout direction of the placement table 29. The slide rail 31 is internally provided with a number of pulley frames 32 adapted to the opening and closing rigid Rogowski coils. One pulley frame 32 corresponds to one of the opening and closing rigid Rogowski coils. The bottom of the bracket 16 of the opening and closing rigid Rogowski coil is connected to the corresponding pulley frame 32. A pulley assembly is provided inside the pulley frame 32. The pulley frame 32 is slidably connected to the pulley frame 32 through the pulley assembly. Connected to the slide rail 31, each pulley frame 32 is also provided with a drive motor 33 for driving the pulley assembly to slide along the slide rail 31. All drive motors 33 are electrically connected to the intelligent controller, and the intelligent controller can control the operation of the drive motor 33; through the above-mentioned setting, the user can use the intelligent controller to control the operation of the drive motor 33 to drive the pulley frame 32 to slide in the slide rail 31, thereby adjusting the position of the corresponding open and close rigid Rogowski coil on the placement table 29 to adapt to the three-phase and one-ground overhead line m structure with different spacing.

[0099] In order to be able to measure the three-phase and one-ground overhead line m structure at various distances, based on Example 5, Example 7 is proposed;

[0100] Example 7: Please refer to Figure 15 and Figure 16The present embodiment provides an overhead line measuring device, including all the structures in Example 5. Furthermore, a slide rail 31 is provided on the top surface of the placement table 29. The layout direction of the slide rail 31 is adapted to the layout direction of the placement table 29. A pulley frame 32 adapted to the number of the open and close rigid Rogowski coils is provided inside the slide rail 31. One pulley frame 32 corresponds to one of the open and close rigid Rogowski coils. The bottom of the bracket 16 of the open and close rigid Rogowski coil is connected to the corresponding pulley frame 32. A pulley assembly is provided inside the pulley frame 32. The pulley frame 32 is slidably connected to the slide rail 31 through the pulley assembly. Each pulley frame 32 is also provided with a driving motor 33 for driving the pulley assembly to slide along the slide rail 31. All driving motors 33 are electrically connected to the intelligent controller, and the intelligent controller can control the driving motor 33 to work. A connecting channel 34 connected to the slide rail 31 is also provided on one side wall of the placement table 29. The length and layout direction of the connecting channel 34 are adapted to the slide rail 31. The connecting channel 34 is adapted to the length and layout direction of the slide rail 31. 4 is slidably connected with a number of sliders 35 adapted to the pulley frame 32, one slider 35 corresponds to one pulley frame 32, one end of all sliders 35 extends into the slide rail 31 and is fixed together with the corresponding pulley frame 32, and all transmission motors 30 are connected to the other end of the slider 35 connected to the pulley frame 32 corresponding to the corresponding open and close type rigid Rogowski coil; through the above-mentioned arrangement, the user can adjust the position of the corresponding open and close type rigid Rogowski coil on the placement table 29 by using the intelligent controller to control the drive motor 33 to drive the pulley frame 32 to slide in the slide rail 31, so as to adapt to the three-phase and one-ground overhead line m structure with different spacings. In the process of the pulley frame 32 sliding along the slide rail 31, the corresponding slider 35 will slide along the connecting channel 34 driven by the pulley frame 32, thereby driving the transmission motor 30 to move, so as to ensure that the transmission motor 30 can follow the corresponding open and close type rigid Rogowski coil, thereby ensuring the normal use of the overhead line m measuring device.

[0101] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention.

[0102] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0103] The above are only typical examples of the present invention. In addition, the present invention may have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A retractable rigid Rogowski coil based on magnetic potential distribution calculation, characterized by: The invention comprises a first shell (1) and a second shell (2) which are matched with each other to form a closed loop structure, wherein a first plug-in block (3) is provided on one end of the first shell (1), and a first plug-in slot (4) is provided on the other end of the first shell (1); a second plug-in block (5) is provided on one end of the second shell (2), and a second plug-in slot (6) is provided on the other end of the second shell (2); when the first shell (1) and the second shell (2) are matched with each other to form a closed loop structure, the first plug-in block (3) is plugged into the second plug-in slot (6), and the second plug-in block (5) is plugged into the first plug-in slot (4); A first coil (7) is provided in the first shell (1), and a second coil (8) is provided in the second shell (2). When the first shell (1) and the second shell (2) are aligned with each other to form a closed loop structure, the two ends of the first coil (7) and the corresponding side ends of the second coil (8) are close to each other, and the corresponding side ends of the first coil (7) enter the second plug-in slot (6), and the corresponding side ends of the second coil (8) enter the first plug-in slot (4); A first shielding coil (9) is provided in the first shell (1), and the position of the first shielding coil (9) in the first shell (1) is set according to the magnetic potential distribution calculation method. When the first shell (1) and the second shell (2) are matched with each other to form a closed loop structure, the corresponding side ends of the first coil (7) and the second coil (8) are both extended into the first shielding coil (9). A second shielding coil (10) is provided in the second shell (2), and the position of the second shielding coil (10) in the second shell (2) is set according to the magnetic potential distribution calculation method. When the first shell (1) and the second shell (2) are matched with each other to form a closed loop structure, the corresponding side ends of the first coil (7) and the second coil (8) are both extended into the second shielding coil (10). The magnetic potential distribution calculation method comprises the following steps: Calculate the coordinates of any point on the inner diameter of the coil, the coordinates of any point on the outer diameter of the coil and the magnetic potential distribution path vector of the coil; Calculate the magnetic field intensity vector of the inner diameter current of the coil at a certain point in the coil, the magnetic field intensity vector of the outer diameter current of the coil at a certain point in the coil, and the magnetic voltage drop distribution generated by the inner diameter current and the outer diameter current of the coil on a certain path; The magnetic potential distribution and magnetic field leakage at any point on the coil frame surface are obtained based on the magnetic voltage drop distribution to determine the accuracy and anti-interference performance of the coil; Obtain magnetic potential distribution maps on the surface of a densely and evenly wound circular skeleton Rogowski coil and a circular skeleton Rogowski coil with uneven winding or winding gaps, and determine the position with the largest magnetic potential distribution difference by comparing the magnetic potential distribution maps; A first shielding ring (11) is further provided in the first shell (1), one end of the first shielding ring (11) is connected to the first coil (7), and the other end surrounds the outer ring portion of the first coil (7) and then penetrates into the first shielding coil (9), and the end position of the first shielding ring (11) connected to the first coil (7) is set to meet the requirement that when the first shell (1) and the second shell (2) are matched to form a closed loop structure, the connection end of the first shielding ring (11) and the first coil (7) is located in the second shielding coil (10), and a second shielding ring (12) is further provided in the second shell (2), one end of the second shielding ring (12) is connected to the second coil (8), and the other end surrounds the outer ring portion of the second coil (8) and then penetrates into the second shielding coil (10), and the end position of the second shielding ring (12) connected to the second coil (8) is set to meet the requirement that when the first shell (1) and the second shell (2) are matched to form a closed loop structure, the connection end of the second shielding ring (12) and the second coil (8) is located in the first shielding coil (9).

2. The retractable rigid Rogowski coil based on magnetic potential distribution calculation according to claim 1, characterized in that: A first output block (13) is provided on the outer ring wall of the first shell (1), and the end of the first shielding ring (11) that penetrates into the first shielding coil (9) continues to penetrate into the first output block (13); a second output block (14) is provided on the outer ring wall of the second shell (2), and the end of the second shielding ring (12) that penetrates into the second shielding coil (10) continues to penetrate into the second output block (14).

3. The retractable rigid Rogowski coil based on magnetic potential distribution calculation according to claim 1, characterized in that: A symmetrically arranged connecting plate (15) is provided below the first shell (1) and the second shell (2), and a bracket (16) is provided below the connecting plates (15) on both sides. The bottoms of the connecting plates (15) on both sides are fixed to the bracket (16). A first torsion spring rotating shaft (17) and a second torsion spring rotating shaft (18) are provided between the connecting plates (15) on both sides. Both ends of the first torsion spring rotating shaft (17) and the second torsion spring rotating shaft (18) are rotatably connected to the corresponding side connecting plates (15). A first connecting block (19) is provided on the outer ring wall of the first shell (1), and the first connecting block (19) is fixed to the first torsion spring rotating shaft (17). A second connecting block (20) is provided on the outer ring wall of the second shell (2), and the second connecting block (20) is fixed to the second torsion spring rotating shaft (18). When the first torsion spring rotating shaft (17) and the second torsion spring rotating shaft (18) are in a normal state, the first shell (1) and the second shell (2) are in an open structure.

4. The retractable rigid Rogowski coil based on magnetic potential distribution calculation according to claim 3, characterized in that: A first connecting ring (21) is provided on the inner ring wall of the first shell (1), and a second connecting ring (22) is provided on the inner ring wall of the second shell (2). A horizontally arranged elastic rope (23) is provided between the first connecting ring (21) and the second connecting ring (22), and two ends of the elastic rope (23) are respectively connected to the first connecting ring (21) and the second connecting ring (22) on the corresponding side.

5. The retractable rigid Rogowski coil based on magnetic potential distribution calculation according to claim 4, characterized in that: A first pull plate (24) arranged obliquely downward is fixedly connected to the first torsion spring rotating shaft (17), and a second pull plate (25) arranged obliquely downward is fixedly connected to the second torsion spring rotating shaft (18). The first pull plate (24) and the second pull plate (25) are arranged symmetrically. A pull rope (26) is provided below the first pull plate (24) and the second pull plate (25). One end of the pull rope (26) is arranged in a forked shape. The forked ends of the pull rope (26) are respectively connected to the first pull plate (24) and the second pull plate (25), and the other end is arranged to extend vertically downward.

6. An overhead line measuring device, characterized in that: The invention comprises a support rod (27), the top of which is provided with a base of a vertically arranged electric telescopic rod (28), a placement table (29) on the telescopic rod end of the electric telescopic rod (28), a top surface of which is provided with a plurality of open-close rigid Rogowski coils as claimed in claim 5, a side wall of which is provided with a number of transmission motors (30) adapted to the open-close rigid Rogowski coils, one transmission motor (30) corresponding to one open-close rigid Rogowski coil, the electric spindles of all transmission motors (30) being connected to the ends of pull ropes (26) extending vertically downward on the corresponding open-close rigid Rogowski coils, an intelligent controller being further provided on the support rod (27), the intelligent controller being electrically connected to the electric telescopic rod (28), the open-close rigid Rogowski coil and the transmission motor (30), and the intelligent controller being capable of controlling the operation of the electric telescopic rod (28), reading the data measured by the open-close rigid Rogowski coils and controlling the operation of the transmission motor (30).

7. The overhead line measuring device according to claim 6, characterized in that: The top surface of the placement table (29) is provided with a slide rail (31), and the slide rail (31) is provided with a number of pulley frames (32) adapted to the opening and closing rigid Rogowski coils. One pulley frame (32) corresponds to one opening and closing rigid Rogowski coil. The bottom of the bracket (16) of the opening and closing rigid Rogowski coil is connected to the corresponding pulley frame (32). A pulley assembly is provided inside the pulley frame (32). The pulley frame (32) is slidably connected to the slide rail (31) through the pulley assembly. A driving motor (33) for driving the pulley assembly to slide along the slide rail (31) is also provided on the pulley frame (32). The driving motor (33) is connected to the intelligent controller. The intelligent controller can control the operation of the drive motor (33). A connecting channel (34) connected to the slide rail (31) is provided on one side wall of the placement table (29). The connecting channel (34) is slidably connected with a number of sliders (35) adapted to the pulley frame (32). One slider (35) corresponds to one pulley frame (32). One end of all the sliders (35) extends into the slide rail (31) and is fixed to the corresponding pulley frame (32). All the transmission motors (30) are connected to the other end of the slider (35) connected to the pulley frame (32) corresponding to the opening and closing rigid Rogowski coil.

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