A hard shell roth current sensor anti electromagnetic interference shield shell connecting structure

Abstract

The utility model relates to hard skeleton ross's current sensor's anti - electromagnetic interference shielding shell connection technical field, concretely for a kind of hard skeleton ross's current sensor's anti - electromagnetic interference shielding shell connection structure, including shielding shell body, butt joint connecting assembly, electrically-conductive sealing assembly and hard skeleton adaptation structure, the U type elastic conductive rubber strip of electrically-conductive sealing assembly cooperates with copper alloy contact piece, both eliminate the physical gap of butt flange, and also guarantee the electrically-conductive continuity between shell unit, interference signal penetration amount reduces, positioning member guides the accurate alignment of butt flange, locking piece is evenly distributed along circumference and ensures that flange adhering pressure is consistent, avoid the connection slackening caused by long-term vibration, hard skeleton adaptation structure passes through support boss and elastic pressing piece, realize sensor stable fixation while avoiding hard skeleton damage, insulating lining isolates shell and sensor, shell outside ground assembly cooperates with conductive plating.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic interference shielding shell connection technology for rigid frame Rogowski current sensors, specifically to an electromagnetic interference shielding shell connection structure for rigid frame Rogowski current sensors. Background Technology

[0002] Rigid-frame Rogowski current sensors are core devices for precise current measurement in power systems and industrial control. Their measurement accuracy is highly susceptible to external electromagnetic interference—and the connection structure of the shielded housing is crucial for ensuring anti-interference performance.

[0003] Traditional shielding shell connection structures suffer from insufficient electromagnetic shielding effectiveness. To facilitate disassembly and assembly, simple flange bolt connections are often used at the shell joints. However, gaps can easily form on the flange mating surfaces due to processing errors or long-term use, creating electromagnetic leakage channels. Furthermore, the joint lacks a reliable conductive continuity structure, resulting in contact resistance between different shell units and preventing the formation of a complete electromagnetic shield. External high-frequency interference signals can easily seep into the shell through gaps and contact gaps, leading to increased sensor measurement errors and failing to meet the requirements for high-precision current measurement. While existing technologies attempt to improve shielding by thickening the shell material, they do not address the fundamental defects of the connection structure, and the anti-interference performance remains limited by gaps and poor conductivity at the joint. Utility Model Content

[0004] The purpose of this invention is to provide an anti-electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor, which solves the problem of insufficient electromagnetic shielding effectiveness in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: An electromagnetic interference shielding housing connection structure for a rigid frame Rogowski current sensor includes: The shielding housing is used to enclose the rigid frame Rogowski current sensor; A docking connection component is provided at the docking edge of adjacent shell units to achieve precise docking and fixation of the shell units; A conductive sealing assembly, sandwiched between two mating flanges, is used to eliminate mating gaps and ensure the conductive continuity of the housing. It includes conductive seals and conductive contact pieces. The conductive seals are distributed circumferentially along the mating flanges and conform to the flange surfaces. The conductive contact pieces are embedded in the conductive seals, with their ends abutting against the two mating flanges respectively. A rigid frame adapter structure is provided inside the shielding housing and is used to fix the rigid frame Rogowski current sensor and is adapted to the contour of the sensor's rigid frame.

[0006] Preferably, the shielding shell body includes at least two detachable shell units, which are made of metal shielding material. The shell units are semi-shell structures, which are spliced ​​together to form a complete cavity. The inner wall of the cavity is provided with an insulating liner, which is connected to the rigid frame adapter structure.

[0007] Preferably, the docking connection assembly includes a docking flange, a positioning element, and a locking element. The docking flange extends along the edge of the outer shell unit, and the docking flanges of the two outer shell units fit together. The positioning element is disposed on the surface of the docking flange to guide the two flanges to be precisely aligned. The locking element passes through the two docking flanges to detachably fix the outer shell unit. The positioning element is a combination of a positioning pin and a positioning hole. The positioning pin is vertically fixed to the surface of one of the docking flanges, and the positioning hole is opened at the corresponding position of the other docking flange. The positioning pin and the positioning hole are clearance-fitted. The locking element is a bolt, which is evenly distributed along the circumference of the docking flange, and the bolt axis is perpendicular to the flange surface.

[0008] Preferably, the conductive sealing component of the conductive sealing assembly is an elastic conductive rubber strip with a U-shaped cross-section and an opening facing the mating flange. The rubber strip is embedded with metal conductive fibers, and the conductive contact piece is a copper alloy sheet that is spaced apart along the length of the conductive sealing component. Both ends of the sheet extend out of the surface of the conductive sealing component and are in close contact with the mating flange.

[0009] Preferably, the rigid frame adapter structure includes a support boss and a clamping member. The support boss is distributed circumferentially along the inner wall of the shielding shell body and fits against the bottom of the sensor rigid frame. The clamping member is an elastic pressure plate, with one end fixed to the inner wall and the other end extending towards the rigid frame and abutting against the top surface of the rigid frame.

[0010] Preferably, the outer side of the shielding shell body is provided with a grounding component, including a grounding terminal and a grounding wire. The grounding terminal is welded to the outer wall of the shell unit, one end of the grounding wire is connected to the grounding terminal, and the other end is used to connect to an external grounding system. The surface of the grounding terminal is provided with an anti-oxidation coating.

[0011] Preferably, the mating flange surface is provided with a conductive coating, the coating covering the flange mating surface and the inner wall of the through hole of the locking member, and a conductive washer is provided between the bolt head of the locking member and the flange, the washer contacting the conductive coating of the flange.

[0012] Preferably, the outer shell unit of the shielding shell body is provided with reinforcing ribs at its edge, the reinforcing ribs are distributed along the length direction of the mating flange, the cross section is triangular, and the outer wall of the outer shell unit is provided with anti-slip texture, the texture extending along the length direction of the shell.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are: The U-shaped elastic conductive rubber strip of the conductive sealing assembly works in conjunction with the copper alloy contact piece to eliminate physical gaps in the mating flange and ensure conductive continuity between the housing units. The electromagnetic shielding effectiveness is improved to over 60dB, reducing the amount of interference signal penetration. The positioning component guides the mating flange to precise alignment, and the locking component is evenly distributed circumferentially to ensure consistent flange fitting pressure, avoiding loosening of the connection due to long-term vibration. The rigid frame adapter structure, through the support boss and elastic pressure plate, achieves stable fixation of the sensor while preventing damage to the rigid frame. The insulating liner isolates the housing and sensor to prevent electrochemical corrosion. The grounding component on the outside of the housing works with the conductive plating layer to guide the weak interference signal that has penetrated into the ground, further improving the anti-interference effect. The reinforcing ribs enhance the edge strength of the housing, and the anti-slip texture facilitates disassembly and assembly. Attached Figure Description

[0014] Figure 1 This is a side view of the structure of this utility model; Figure 2 This is a schematic diagram of the anti-slip texture of this utility model; Figure 3 This is a schematic diagram of the structure of the docking connection component of this utility model; Figure 4 This is a structural diagram of the rigid frame adapter structure of this utility model; Figure 5 This utility model Figure 4 A magnified schematic diagram of the local structure at point A.

[0015] The components include: 1. Shielded outer shell body; 2. Butt connection assembly; 3. Conductive sealing assembly; 4. Conductive sealing element; 5. Conductive contact piece; 6. Rigid frame adapter structure; 7. Outer shell unit; 8. Liner; 9. Butt flange; 10. Positioning element; 11. Locking element; 12. Positioning pin; 13. Positioning hole; 14. Support boss; 15. Clamping element; 16. Grounding assembly; 17. Grounding terminal; 18. Grounding wire; 19. Anti-oxidation coating; 20. Conductive coating; 21. Conductive gasket; 22. Reinforcing rib; 23. Anti-slip texture. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-5An electromagnetic interference (EMI) shielding shell connection structure for a rigid-frame Rogowski current sensor is presented. Through an integrated design of "conductive sealing to eliminate gaps + precise docking and positioning + grounding-assisted interference suppression," it achieves efficient EMI shielding and stable installation of the rigid-frame Rogowski current sensor. The core solution is as follows: the shielding shell body 1 is composed of detachable metal shell units 7, which enclose the sensor to form a protective cavity. The docking connection component 2 ensures precise docking and fixation of the shell units 7, preventing loosening. The conductive sealing component 3 eliminates docking gaps and ensures the conductive continuity of the shell, blocking electromagnetic leakage paths. The rigid-frame adapter structure 6 securely fixes the sensor to prevent damage. The grounding component 16 guides weak interference signals to the ground, further enhancing the interference suppression effect. All components are tightly fitted through flange fitting, elastic contact, and bolt fixing, solving the problem of insufficient EMI shielding effectiveness caused by large docking gaps and discontinuous conductivity in traditional shielding shells. This design is suitable for rigid-frame Rogowski current sensors with high measurement accuracy requirements in power systems and industrial control fields, and is especially suitable for scenarios with complex high-frequency electromagnetic interference.

[0018] The shielding housing body 1 is the basic carrier for achieving electromagnetic shielding, providing a closed protective space for the rigid frame Rogowski current sensor. The shielding housing body 1 includes at least two detachable housing units 7, which are made of metal shielding materials (such as cold-rolled steel plate or aluminum alloy). Metal materials have excellent electromagnetic shielding performance and can reflect and absorb external interference signals. The edges of the housing units 7 are bent and formed, and after splicing, they form a complete cylindrical or rectangular cavity. The cavity size is adapted to the rigid frame Rogowski current sensor to ensure that the sensor is tightly covered without obvious gaps.

[0019] An insulating liner 8 (such as a polytetrafluoroethylene film) is attached to the inner wall of the cavity. The liner 8 is fixed to the inner wall with glue, which not only isolates the metal shell from the sensor to prevent electrochemical corrosion, but also buffers the direct contact between the sensor and the shell to avoid damage to the rigid frame. The edge of the shell unit 7 is integrally formed with reinforcing ribs 22 (with a triangular cross section) along the length of the mating flange 9 to enhance the rigidity of the flange structure, avoid flange deformation caused by long-term use or vibration, and ensure the mating seal.

[0020] The outer wall of the outer shell unit 7 is machined with anti-slip texture 23 (vertical stripes extending along the length of the outer shell). The texture depth is moderate, which enhances the grip friction and facilitates the disassembly and assembly of the outer shell unit 7. It can still be held stably, especially when the hands are wearing gloves or the surface of the outer shell is contaminated with oil.

[0021] The docking connection component 2 is located at the docking edge of the adjacent outer shell unit 7 and is the core for achieving precise docking and reliable fixation of the outer shell unit 7. The docking flange 9 extends horizontally along the edge of the outer shell unit 7 (integrated with the outer shell unit 7). The flange surface is milled to be flat and smooth, ensuring that there is no obvious gap when the flanges of the two outer shell units 7 are fitted together. The flange has a reserved positioning hole 13 and a bolt hole. The positioning hole 13 is used to install the positioning component 10, and the bolt hole is used to pass through the locking component 11. The hole positions are evenly distributed along the circumference of the flange to ensure force balance.

[0022] The positioning component 10 is a combination of positioning pin 12 and positioning hole 13. Positioning pin 12 (metal material, chrome plated) is vertically welded to the surface of one of the mating flanges 9. Positioning hole 13 (clearly fitted with positioning pin 12) is opened at the corresponding position of the other mating flange 9. When the housing unit 7 is mated, positioning pin 12 is first inserted into positioning hole 13 to guide the two flanges to be precisely aligned, avoiding sensor collision or increased gap caused by the housing unit 7 shifting during mating.

[0023] The locking component 11 is a bolt (made of stainless steel with anti-loosening washers), which is evenly distributed around the circumference of the mating flange 9. The bolt axis is perpendicular to the flange surface. The bolt passes through the bolt holes of the two mating flanges 9 and is fixed by tightening nuts, so that the two flanges fit tightly together, ensuring that there is no loosening after the outer shell unit 7 is spliced, and maintaining the docking stability even in a vibration environment.

[0024] The conductive sealing component 3 is sandwiched between the two mating flanges 9 and is the key to eliminating the mating gap and ensuring the conductivity continuity of the shell. The conductive seal 4 is an elastic conductive rubber strip (with a U-shaped cross-section) with the opening facing the mating flange 9. The rubber strip is embedded with metal conductive fibers (such as copper fibers), which have both elasticity and conductivity. The conductive seal 4 is continuously distributed along the circumference of the mating flange 9 and is fixed to the mating surface of one of the flanges by glue or clips. When the two flanges are mated, the U-shaped rubber strip is squeezed and undergoes elastic deformation, filling the tiny gaps on the mating surface of the flange caused by processing errors or deformation, and blocking the channel for electromagnetic signals to seep in through the gaps.

[0025] The conductive contact piece 5 is a thin copper alloy sheet (tin-plated to prevent oxidation) and is spaced apart along the length of the conductive seal 4. Both ends of the sheet extend out of the surface of the conductive seal 4. When the flanges are fitted, the two ends of the contact piece are in close contact with the mating surfaces of the two mating flanges 9, forming a metal conductive path. This ensures the continuity of conductivity between different outer shell units 7, avoids contact resistance caused by poor flange fit, ensures that the entire shielding shell forms a complete conductor, and improves the electromagnetic shielding effectiveness.

[0026] The rigid frame adapter structure 6 is located inside the shielded housing body 1 to securely fix the rigid frame Rogowski current sensor and prevent sensor displacement or damage. The support boss 14 is a metal block structure (integrated with the inner wall of the housing unit 7) and is evenly distributed along the circumference of the inner wall. The top surface of the boss is polished and fits tightly with the bottom of the rigid frame of the rigid frame Rogowski current sensor to provide bottom support for the sensor and ensure that the sensor is in the center position in the cavity without significant shaking.

[0027] The clamping element 15 is an elastic clamping plate (made of phosphor bronze, which has good elasticity). One end is fixed to the inner wall of the outer shell unit 7 by bolts, and the other end extends towards the sensor rigid frame. In its natural state, it abuts against the top surface of the rigid frame. The elastic force of the elastic clamping plate keeps the rigid frame in close contact with the support boss 14, which not only achieves axial fixation of the sensor, but also buffers the small deformation of the sensor caused by vibration or temperature changes, and avoids damage to the rigid frame due to rigid compression.

[0028] The grounding component 16 is located on the outside of the shielded housing body 1 and is used to guide the weak electromagnetic interference signal induced on the housing to the ground, further enhancing the anti-interference effect. The grounding terminal 17 (copper material) is fixed to the outer wall of the housing unit 7 by welding (near the docking flange 9). The terminal surface is plated with an anti-oxidation coating 19 (such as nickel plating) to prevent oxidation and rust caused by long-term exposure and ensure reliable grounding path. The terminal has a threaded hole for connecting the grounding wire 18.

[0029] One end of the grounding wire 18 (multi-strand copper core wire with an outer insulating sheath) is connected to the threaded hole of the grounding terminal 17 via a bolt, and the other end is used to connect to an external grounding system (such as a grounding grid). When an external electromagnetic interference signal induces a charge on the surface of the casing, it can be quickly conducted to the ground through the grounding wire 18, so as to avoid the interference signal forming an electric field or magnetic field inside the casing and affecting the measurement accuracy of the sensor.

[0030] The mating flange 9 is plated with a conductive plating layer 20 (such as copper or silver plating). The plating layer covers the flange mating surface and the inner wall of the bolt hole. At the same time, a conductive washer 21 (made of copper) is placed between the bolt head of the locking component 11 and the flange. The washer is in close contact with the conductive plating layer 20 of the flange. The conductive plating layer 20 and the conductive washer 21 work together to ensure the conductivity continuity of the bolt connection, so that the grounding path of the entire shell is uninterrupted and the efficiency of interference signal extraction is improved.

[0031] The positioning pin 12 of the docking connection component 2 guides the housing unit 7 to accurately dock, and the bolts are tightened to make the flange fit tightly. The elastic conductive rubber strip of the conductive sealing component 3 deforms as the flange fits and is squeezed, filling the gap. The conductive contact piece 5 contacts both flanges at the same time to form a conductive path. The two work together to achieve "gapless docking + continuous conductivity" and block electromagnetic leakage.

[0032] The rigid frame adapter structure 6 has a support boss 14 and an elastic pressure plate that fixes the sensor from the top and bottom to prevent displacement. The insulating liner 8 isolates the sensor from the metal shell to prevent corrosion and damage. The reinforcing rib 22 enhances the rigidity of the flange and prevents deformation from affecting the seal. The three work together to ensure that the sensor is stable and safe inside the shielded shell.

[0033] The metal casing reflects external interference signals, the conductive sealing component 3 blocks gap leakage, the grounding component 16 conducts the weak interference induced by the casing to the ground, and the conductive plating layer 20 and the conductive gasket 21 ensure the continuity of the grounding path, forming a triple anti-interference system of "shielding-gap elimination-grounding", which greatly improves the electromagnetic shielding effectiveness.

[0034] Take one of the housing units 7, put the rigid frame Rogowski current sensor into the cavity, make the bottom of the sensor rigid frame fit with the support boss 14 on the inner wall, adjust the position of the sensor, and ensure that the top surface of the rigid frame contacts the elastic pressure plate. The elastic pressure plate will produce a slight deformation to firmly press the sensor.

[0035] On the mating surface of the flange 9 of one of the housing units 7, fix the elastic conductive rubber strip of the conductive sealing assembly 3 circumferentially (ensure that the conductive contact piece 5 faces the mating direction), check the position of the locating pin 12 and the locating hole 13 to ensure that there is no offset, align the other housing unit 7 with the unit, and gradually insert the locating pin 12 into the locating hole 13 to guide the flange to fit.

[0036] Along the circumference of the mating flange 9, the bolts are sequentially inserted into the bolt holes of the two flanges. After the conductive washer 21 is put on, the nuts are tightened to make the two flanges fit tightly together. At this time, the elastic conductive rubber strip is compressed and deformed to fill the flange gap. The two ends of the conductive contact piece 5 are in contact with the two flanges to form a conductive path. The reinforcing rib 22 ensures that the flange is not deformed and maintains the sealing state.

[0037] Connect one end of the grounding wire 18 to the grounding terminal 17 of the outer casing unit 7, and connect the other end to the external grounding system. Start the hard-frame Rogowski current sensor. External interference signals are reflected by the metal casing. A small amount of signal that seeps in is conducted to the casing through the conductive path and then guided to the ground through the grounding wire 18. The sensor achieves accurate current measurement in a low-interference environment.

[0038] During maintenance, first disconnect the grounding wire 18, loosen the bolts of the connecting flange 9, separate the two outer casing units 7, and take out the sensor for inspection or replacement. After the inspection is completed, reassemble according to the above steps to ensure that all components are properly matched.

[0039] Shielding of Rogowski current sensors in power systems In power systems, rigid-frame Rogowski current sensors need to measure bus current. There is high-frequency electromagnetic interference generated by equipment such as transformers and frequency converters in the vicinity. The shielding shell is required to effectively block the interference and ensure that the sensor measurement error is stable within the allowable range. At the same time, the shell needs to be easy to disassemble and maintain.

[0040] Two semi-shell-shaped aluminum alloy housing units 7 are spliced ​​together to form a cylindrical cavity. The inner wall is fitted with a polytetrafluoroethylene insulating liner 8, and the edge reinforcing ribs 22 enhance rigidity. The outer wall has anti-slip textures 23 for easy gripping. The aluminum alloy mating flange 9 has a positioning pin 12 that precisely matches the positioning hole 13. Stainless steel bolts are evenly distributed around the circumference to ensure a tight fit. A U-shaped elastic conductive rubber strip (embedded with copper fiber) and copper alloy conductive contact pieces 5 are spaced apart to eliminate flange gaps and ensure conductivity. Three metal support bosses 14 fit the bottom of the sensor's rigid frame. A phosphor bronze elastic pressure plate abuts against the top surface to securely fix the sensor. A copper grounding terminal 17 (nickel-plated) is welded to the outer wall of the housing. A multi-strand copper core grounding wire 18 is connected to the power system grounding grid. The flange surface is copper-plated to enhance conductivity.

[0041] External high-frequency interference signals are reflected by the metal casing, and the mating gap is eliminated by the conductive sealing component 3. There is no obvious electromagnetic leakage, the sensor measurement error is stable and unaffected by external interference, the rigid frame adapter structure 6 ensures that the sensor does not shift in a vibration environment, the insulating liner 8 prevents corrosion and is undamaged during long-term use, the anti-slip texture 23 facilitates the disassembly and assembly of the casing, the grounding component 16 is easy to connect, and no complicated tools are required for maintenance, which greatly shortens downtime.

[0042] The shielding housing body 1 is made of stainless steel to enhance corrosion resistance, making it suitable for humid and dusty industrial environments (such as chemical workshops) and extending the service life of the housing. The conductive seal 4 is made of fluororubber to improve temperature resistance and adapt to sensor shielding in high-temperature environments (such as scenarios near heat-generating equipment).

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor, characterized in that, include: The shielding housing body (1) is used to cover the rigid frame Rogowski current sensor; The docking connection component (2) is provided at the docking edge of the adjacent shell unit (7) to achieve precise docking and fixation of the shell unit (7); The conductive sealing assembly (3) is sandwiched between two mating flanges (9) to eliminate mating gaps and ensure the conductive continuity of the outer shell. It includes a conductive seal (4) and a conductive contact piece (5). The conductive seal (4) is distributed circumferentially along the mating flange (9) and is attached to the flange surface. The conductive contact piece (5) is embedded in the conductive seal (4) and its two ends abut against the two mating flanges (9) respectively. as well as The rigid frame adapter structure (6) is located inside the shielded housing body (1) and is used to fix the rigid frame Rogowski current sensor and is adapted to the outline of the sensor rigid frame.

2. The electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor according to claim 1, characterized in that: The shielding shell body (1) includes at least two detachable shell units (7), which are made of metal shielding material. The shell unit (7) is a semi-shell structure. After splicing, it forms a complete cavity. The inner wall of the cavity is provided with an insulating liner (8). The liner (8) is connected to the rigid frame adapter structure (6).

3. The electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor according to claim 1, characterized in that: The docking connection assembly (2) includes a docking flange (9), a positioning element (10), and a locking element (11). The docking flange (9) extends along the edge of the outer shell unit (7), and the docking flanges (9) of the two outer shell units (7) fit together. The positioning element (10) is located on the surface of the docking flange (9) to guide the two flanges to be precisely aligned. The locking element (11) passes through the two docking flanges (9) to detachably fix the outer shell unit (7). The positioning element (10) is a combination of a positioning pin (12) and a positioning hole (13). The positioning pin (12) is vertically fixed on the surface of one of the docking flanges (9), and the positioning hole (13) is opened at the corresponding position of the other docking flange (9). The positioning pin (12) and the positioning hole (13) are clearance-fitted. The locking element (11) is a bolt, which is evenly distributed along the circumference of the docking flange (9), and the bolt axis is perpendicular to the flange surface.

4. The electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor according to claim 1, characterized in that: The conductive sealing component (4) of the conductive sealing assembly (3) is an elastic conductive rubber strip with a U-shaped cross section and an opening facing the docking flange (9). The rubber strip is embedded with metal conductive fibers, and the conductive contact piece (5) is a copper alloy sheet, which is distributed at intervals along the length of the conductive sealing component (4). Both ends of the sheet extend out of the surface of the conductive sealing component (4) and are in close contact with the docking flange (9).

5. The electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor according to claim 1, characterized in that: The rigid frame adapter structure (6) includes a support boss (14) and a clamping member (15). The support boss (14) is distributed circumferentially along the inner wall of the shielding shell body (1) and fits against the bottom of the sensor rigid frame. The clamping member (15) is an elastic pressure plate, with one end fixed to the inner wall and the other end extending towards the rigid frame to abut against the top surface of the rigid frame.

6. The electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor according to claim 1, characterized in that: The shielding shell body (1) is provided with a grounding component (16) on the outside, including a grounding terminal (17) and a grounding wire (18). The grounding terminal (17) is welded to the outer wall of the shell unit (7). One end of the grounding wire (18) is connected to the grounding terminal (17), and the other end is used to connect to the external grounding system. The surface of the grounding terminal (17) is provided with an anti-oxidation coating (19).

7. The electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor according to claim 1, characterized in that: The mating flange (9) is provided with a conductive plating layer (20), which covers the flange mating surface and the inner wall of the through hole of the locking member (11). A conductive washer (21) is provided between the bolt head of the locking member (11) and the flange, and the washer is in contact with the conductive plating layer (20) of the flange.

8. The electromagnetic interference shielding shell connection structure for a rigid frame Rogowski current sensor according to claim 1, characterized in that: The outer shell unit (7) of the shielding shell body (1) is provided with reinforcing ribs (22) at the edge. The reinforcing ribs (22) are distributed along the length direction of the mating flange (9) and have a triangular cross section. The outer wall of the outer shell unit (7) is provided with anti-slip texture (23) which extends along the length direction of the shell.

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