Electromagnetic isolation structure and monitoring device having the same

Abstract

The application provides an electromagnetic isolation structure and a monitoring device with the same. The electromagnetic isolation structure comprises: a conductive shell assembly; and a connecting cable, which comprises: a conductor sheath and a conductor which are sequentially sleeved from outside to inside, the conductor passes through the conductive shell assembly, and the conductor is used for transmitting a signal of preset information; and the conductor sheath is electrically connected with the conductive shell assembly, and the conductive shell assembly blocks electromagnetic waves outside the conductive shell assembly. The application solves the problem that the existing transformer substation flood monitoring device is prone to electromagnetic interference.

Description

Technical Field

[0001] This invention relates to the field of flood monitoring technology in substations, and more specifically, to an electromagnetic isolation structure and a monitoring device having the same. Background Technology

[0002] Substation flood monitoring is a crucial aspect of ensuring the safe operation of power equipment. Monitoring devices are typically deployed in low-lying, damp locations with extremely harsh electromagnetic environments, such as cable trenches and sump pits. The basic function of these devices is to collect on-site hydrological data using sensors such as water level sensors and rainfall sensors. After signal conditioning and analog-to-digital conversion, a microprocessor processes the data and assesses flood risk. Finally, the warning information is uploaded to the back-end monitoring system via wired or wireless means.

[0003] However, substations contain various sources of strong electromagnetic interference, such as: fast transient pulse groups generated by circuit breaker opening and closing and disconnecting switch operations, with a spectrum covering tens of kHz to hundreds of MHz; surge voltages induced by lightning strikes reaching tens of kV; power frequency electromagnetic fields with field strengths reaching hundreds of A / m near current transformers; and high-frequency noise generated by partial discharge and corona discharge. These interferences can easily couple into the monitoring device through conduction or radiation, causing serious jumps or errors in the acquisition of data such as water level and rainfall, resulting in errors in flood warning functions. Summary of the Invention

[0004] The main objective of this invention is to provide an electromagnetic isolation structure and a monitoring device having the same, so as to solve the problem that substation flood monitoring devices in the prior art are susceptible to electromagnetic interference.

[0005] To achieve the above objectives, according to one aspect of the present invention, an electromagnetic isolation structure is provided, comprising: a conductive housing assembly; a connecting cable, the connecting cable comprising: a conductor sheath and a conductor sequentially sleeved from the outside to the inside, the conductor passing through the conductive housing assembly, the conductor being used to transmit signals of preset information; the conductor sheath being electrically connected to the conductive housing assembly, thereby blocking electromagnetic waves outside the conductive housing assembly.

[0006] Furthermore, the conductive housing assembly includes: a first conductive housing; a second conductive housing, the first conductive housing and the second conductive housing being electrically connected, and a receiving cavity for accommodating the control component being formed between the first conductive housing and the second conductive housing; a connecting cable passing through the first conductive housing or the second conductive housing, the conductor sheaths being electrically connected to the first conductive housing and the second conductive housing, and the output end of the conductor passing through the first conductive housing or the second conductive housing and then being connected to the control component.

[0007] Furthermore, a protrusion is provided on the first conductive housing, extending along the circumferential direction of the first conductive housing, and a groove is provided on the second conductive housing; or, a groove is provided on the first conductive housing, extending along the circumferential direction of the first conductive housing, and a protrusion is provided on the second conductive housing, extending along the circumferential direction of the second conductive housing; the protrusion is embedded in the groove to connect the first conductive housing and the second conductive housing.

[0008] Furthermore, the conductive housing assembly also includes a conductive elastic component embedded in the groove, with its two sides respectively abutting the protrusion and the groove to electrically connect the first conductive housing and the second conductive housing.

[0009] Furthermore, the electromagnetic isolation structure includes: a connector disposed on the conductive housing assembly, the connector having a through-channel; and a conductor retainer disposed within the conductive housing assembly and electrically connected to the conductive housing assembly, the connecting cable passing through the channel and being electrically connected to the conductor retainer.

[0010] Furthermore, the conductive housing assembly is provided with a magnetic suppression and exhaust channel. The first end of the magnetic suppression and exhaust channel is connected to the receiving cavity, and the second end of the magnetic suppression and exhaust channel is connected to the external space. The outer diameter of the magnetic suppression and exhaust channel is H, where 2mm≤H≤3mm; the length of the magnetic suppression and exhaust channel is L, where 8mm≤L≤12mm.

[0011] According to another aspect of the present invention, a monitoring device is also provided, the monitoring device including an electromagnetic isolation structure, the monitoring device further including: a sensing component for sensing preset information of a target area; a control component disposed within a conductive housing component; an output end of a conductor passing through the conductive housing component and connected to the control component, the sensing component transmitting a signal of preset information to the control component through the conductor, and the electromagnetic isolation structure being the aforementioned electromagnetic isolation structure.

[0012] Furthermore, the monitoring device also includes: a protection circuit, which is disposed within the conductive housing assembly. The input terminal of the protection circuit is used to connect to an external power supply cable, and the output terminal of the protection circuit is connected to the control assembly. Along the direction of the input current of the protection circuit, a surge protection component and a filter component are connected in series on the protection circuit. Both the surge protection component and the filter component are disposed within the conductive housing assembly. The surge protection component is used to discharge the surge current in the power supply current, and the surge protection component is used to perform high-frequency filtering on the power supply current processed by the filter component to filter out electromagnetic interference noise.

[0013] Furthermore, the surge protection component includes: a gas discharge tube, a varistor, and a current-limiting resistor. Along the direction of the input current of the protection circuit, the gas discharge tube, the varistor, and the current-limiting resistor are connected sequentially in the protection circuit; wherein, the gas discharge tube and the varistor are connected in parallel in the protection circuit, and the current-limiting resistor is connected in series in the protection circuit.

[0014] Furthermore, the filtering component includes: a first inductor, a first capacitor, a second inductor, a second capacitor, and a filtering grounding circuit. Along the direction of the input current of the protection circuit, the first inductor, the first capacitor, the second inductor, and the second capacitor are connected in parallel to the protection circuit in sequence. The input terminal of the filtering grounding circuit is connected to the protection circuit, and the output terminal of the filtering grounding circuit is used for grounding.

[0015] Furthermore, the conductive housing assembly also includes: conductive isolation components, at least two conductive isolation components, which are spaced apart within the conductive housing assembly to divide the conductive housing assembly into at least three isolation chambers; multiple control components, each of which is disposed within its respective isolation chamber; the conductive housing assembly includes a first inner wall surface, a bottom wall surface, a second inner wall surface, and a top wall surface connected in sequence, the first and second inner wall surfaces being disposed opposite to each other, the bottom and top wall surfaces being disposed opposite to each other, each conductive isolation component being in contact with the first inner wall surface, the bottom wall surface, the second inner wall surface, and the top wall surface, and each conductive isolation component and the conductive housing assembly blocking electromagnetic interference between two adjacent control components.

[0016] Furthermore, a high-frequency impedance element is connected in series on the connecting cable, and the high-frequency impedance element is disposed inside the conductive housing assembly; the monitoring device includes: a grounding circuit, the input terminal of the grounding circuit is connected to the connecting cable, the output terminal of the grounding circuit is used for grounding, and a third capacitor component is connected in series on the grounding circuit.

[0017] By applying the technical solution of this invention, when external electromagnetic waves act on the electromagnetic isolation structure, the conductive housing assembly attenuates the electromagnetic wave energy through reflection and absorption, preventing high-frequency interference signals from entering the interior. This metal shielding structure significantly reduces the impact of external electromagnetic interference on the components inside the conductive housing assembly, ensuring that the components inside the conductive housing assembly operate stably in a strong electromagnetic environment, avoiding system crashes, resets, or data errors caused by electromagnetic interference, and improving the reliability of the monitoring device in harsh electromagnetic environments.

[0018] The conductor is responsible for transmitting signals containing preset information for data communication. A conductor sheath surrounds the conductor, serving to insulate and protect it, as well as blocking external magnetic field interference from affecting the transmission of water level and rainfall information signals within the conductor. When external magnetic field interference acts on the connecting cable, the conductor sheath reflects electromagnetic waves, thus preventing the interference from entering the conductor. This shielding prevents external magnetic field interference from coupling or distorting the water level and rainfall information signals during transmission, ensuring the purity and accuracy of the transmitted signals.

[0019] The conductor sheath, acting as a shielding layer, forms an electrical connection with the conductive housing assembly where the connecting cable enters, eliminating electromagnetic leakage gaps at the cable entry point and ensuring the continuity of the shielding. This design effectively cuts off the path of interference signals transmitted through the cable into the components inside the conductive housing assembly, preventing external interference from being injected into the internal control circuitry via signal lines. Through the electrical connection between the conductor sheath and the conductive housing assembly, integrated protection is achieved from external shielding to cable entry shielding. The conductor sheath intercepts external magnetic field interference, ensuring that water level and rainfall information signals are not affected by external magnetic field interference during transmission within the conductor. This structure solves the problems of discontinuous shielding at cable interfaces and the easy introduction of external magnetic field interference into the internal control circuitry through cables in existing monitoring devices, achieving high reliability, high accuracy, and long service life operation of the substation flood monitoring device. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of a first conductive housing according to an embodiment of the electromagnetic isolation structure of the present invention is shown;

[0022] Figure 2 A schematic diagram of a second conductive housing according to an embodiment of the electromagnetic isolation structure of the present invention is shown;

[0023] Figure 3 A schematic diagram of the control components according to an embodiment of the monitoring device according to the present invention is shown;

[0024] Figure 4 A schematic diagram of a surge protection assembly according to an embodiment of the monitoring device of the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 100. Conductive housing assembly; 110. First conductive housing; 120. Second conductive housing; 130. Conductive elastic component; 140. Connector; 150. Receiving cavity; 160. Conductive isolation component; 170. Isolation chamber; 181. First isolation chamber; 182. Second isolation chamber; 183. Third isolation chamber;

[0027] 200. Control component; 210. Battery control module; 220. Controller module; 230. Sensor control module;

[0028] 30. Protection circuit; 31. First polarity circuit; 32. Second polarity circuit; 300. Surge protection component; 310. Gas discharge tube body; 320. Varistor; 330. Current limiting resistor;

[0029] 400, Filtering component; 410, First inductor component; 420, First capacitor component; 430, Second inductor component; 440, Second capacitor component. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] As mentioned in the background section, substations contain various sources of strong electromagnetic interference, such as: fast transient pulse groups generated by circuit breaker opening and closing and disconnecting switch operations, with a spectrum covering tens of kHz to hundreds of MHz; surge voltages induced by lightning strikes reaching tens of kV; power frequency electromagnetic fields with field strengths reaching hundreds of A / m near current transformers; and high-frequency noise generated by partial discharge and corona discharge. These interferences can easily couple into the monitoring device through conduction or radiation, causing serious jumps or errors in data acquisition such as water level and rainfall, resulting in errors in flood warning functions. Therefore, to address the above technical problems, this application proposes an electromagnetic isolation structure, including: a conductive housing assembly 100 and a connecting cable. The connecting cable includes: a conductor sheath and a conductor sequentially placed from the outside to the inside, with the conductor passing through the conductive housing assembly 100 and used to transmit preset information signals; the conductor sheath is electrically connected to the conductive housing assembly 100, blocking electromagnetic waves from outside the conductive housing assembly 100, thus solving the problem of electromagnetic interference susceptibility of existing substation flood monitoring devices.

[0032] Please refer to Figures 1 to 3 This application provides an electromagnetic isolation structure, including: a conductive housing assembly 100; a connecting cable, the connecting cable including: a conductor sheath and a conductor sequentially sleeved from the outside to the inside, the conductor passing through the conductive housing assembly 100, the conductor being used to transmit signals of preset information; the conductor sheath being electrically connected to the conductive housing assembly 100, and blocking electromagnetic waves outside the conductive housing assembly 100 through the conductive housing assembly 100.

[0033] The conductive housing assembly 100 provided in this application is made of a metallic material, such as stainless steel plate, to form a Faraday cage structure. The conductive housing assembly 100 is used to block direct electromagnetic coupling between the external space and the internal circuitry. When external electromagnetic waves act on the electromagnetic isolation structure, the conductive housing assembly 100 attenuates the electromagnetic wave energy through reflection and absorption, preventing high-frequency interference signals from entering the interior. This metallic shielding structure significantly reduces the impact of external electromagnetic interference on the components inside the conductive housing assembly 100, ensuring stable operation of the components inside the conductive housing assembly 100 in a strong electromagnetic environment. This avoids system crashes, resets, or data errors caused by electromagnetic interference, improving the reliability of the monitoring device in harsh electromagnetic environments.

[0034] The conductor is responsible for transmitting signals containing preset information (such as water level and rainfall information) for data communication. A conductor sheath surrounds the conductor, serving to insulate and protect it, as well as blocking external magnetic fields from interfering with the transmission of water level and rainfall information signals within the conductor. When external magnetic field interference acts on the connecting cable, the conductor sheath reflects electromagnetic waves, thus preventing the interference from entering the conductor. This shielding prevents external magnetic field interference from coupling or distorting the water level and rainfall information signals during transmission within the conductor, ensuring the purity and accuracy of the transmitted signals.

[0035] The conductor sheath, acting as a shielding layer, forms an electrical connection with the conductive housing assembly 100 at the point where the connecting cable enters, eliminating electromagnetic leakage gaps at the cable entry point and achieving continuity of the shielding. This design effectively cuts off the path of interference signals transmitted through the cable into the components inside the conductive housing assembly 100, preventing external interference from being injected into the internal control circuit through the signal line. Through the electrical connection between the conductor sheath and the conductive housing assembly 100, integrated protection from external shielding to cable entry shielding is achieved. The conductor sheath intercepts external magnetic field interference, ensuring that water level and rainfall information signals are not affected by external magnetic field interference during transmission within the conductor. This structure solves the problems of discontinuous shielding at the cable interface and easy introduction of external magnetic field interference into the internal control circuit through the cable in existing monitoring devices, achieving high reliability, high accuracy, and long service life operation of the substation flood monitoring device.

[0036] In the specific implementation process, such as Figure 1 and Figure 2As shown, the conductive housing assembly 100 includes: a first conductive housing 110; a second conductive housing 120, the first conductive housing 110 and the second conductive housing 120 being electrically connected, and a receiving cavity 150 for accommodating the control assembly 200 being formed between the first conductive housing 110 and the second conductive housing 120; a connecting cable passing through the first conductive housing 110 or the second conductive housing 120, the conductor sheaths being electrically connected to the first conductive housing 110 and the second conductive housing 120, and the output end of the conductor passing through the first conductive housing 110 or the second conductive housing 120 and then being connected to the control assembly 200.

[0037] The first conductive shell 110 and the second conductive shell 120 are electrically connected, forming a continuous metal shield. This structure, through the electrical connection of the first conductive shell 110 and the second conductive shell 120, blocks external electromagnetic waves from entering the receiving cavity 150, protecting the control component 200 from interference from strong external electromagnetic fields and ensuring its stable operation in the harsh electromagnetic environment of the substation. The conductor sheath, through the electrical connection of the first conductive shell 110 and the second conductive shell 120, achieves electrical continuity between the cable shielding layer and the overall shielding shell, eliminating potential electromagnetic leakage gaps at the cable entry point and preventing external electromagnetic interference from entering the receiving cavity 150 through the gap between the cable and the shell. The electrical connection between the conductor sheath and the conductive shell assembly 100 establishes a complete electromagnetic shielding path, effectively suppressing the coupling effect of external magnetic field interference on the water level and rainfall information signals transmitted within the conductor, ensuring the purity of the signals during transmission. The conductor passes through the wall of the conductive shell assembly 100, transmitting the signals collected by the sensing component to the internal control component 200. Because of the electrical connection between the conductor sheath and the first conductive housing 110 and the second conductive housing 120, when the conductor passes through the housing, its outer shielding layer (conductor sheath) forms electrical contact with the housing. This ensures that external interference is always guided to the conductive housing assembly 100 and discharged during the signal cable's entry into the shielded cavity. Only the signal inside the shielded conductor can reach the control assembly 200. Through the tight electrical connection between the conductor sheath and the conductive housing assembly 100, and the conductor's layout, the monitoring device achieves comprehensive electromagnetic protection from external shielding to internal interfaces. This significantly reduces data jumps and processing errors caused by external electromagnetic interference, improving the accuracy of flood monitoring data and the reliability of the device.

[0038] Furthermore, both the first conductive housing 110 and the second conductive housing 120 are made of stainless steel plates.

[0039] Specifically, such as Figure 1 and Figure 2As shown, a protrusion is provided on the first conductive housing 110, and the protrusion extends along the circumferential direction of the first conductive housing 110; a groove is provided on the second conductive housing 120; or, a groove is provided on the first conductive housing 110, and the groove extends along the circumferential direction of the first conductive housing 110; a protrusion is provided on the second conductive housing 120, and the protrusion extends along the circumferential direction of the second conductive housing 120; the protrusion is embedded in the groove so that the first conductive housing 110 and the second conductive housing 120 are connected.

[0040] By interlocking the protrusions with the groove, a continuous physical contact path is formed at the joint surface of the first conductive housing 110 and the second conductive housing 120, ensuring electrical continuity between the two conductive components. The protrusions extend circumferentially and are embedded in the groove, keeping the first conductive housing 110 and the second conductive housing 120 in close contact in the circumferential direction. This circumferentially continuous contact structure eliminates seams and prevents external electromagnetic waves from penetrating into the receiving cavity 150 through local gaps. Through the cooperation of the protrusions and the groove, the first conductive housing 110 and the second conductive housing 120 form a complete metal shield, significantly improving the overall shielding effectiveness, blocking high-frequency electromagnetic interference from affecting the internal control components 200, and ensuring the signal integrity of the monitoring device in a strong electromagnetic environment. The protrusions embedded in the groove increase the contact area between the first conductive housing 110 and the second conductive housing 120 and provide mechanical positioning. This structure, by increasing the contact area, reduces contact resistance and enhances the stability of current conduction between the two housings.

[0041] In the specific implementation process, such as Figure 1 and Figure 2 As shown, the conductive housing assembly 100 further includes a conductive elastic component 130, which is embedded in the groove. The two sides of the conductive elastic component 130 are respectively attached to the protrusion and the groove so that the first conductive housing 110 and the second conductive housing 120 are electrically connected.

[0042] By filling the gap between the protrusion and the groove with a conductive elastic component 130 (such as a conductive rubber strip), a low-impedance electrical path is established between the first conductive housing 110 and the second conductive housing 120, ensuring that the current can smoothly cross the two housings. This eliminates the problem of increased contact resistance caused by metal surface oxide layers or processing roughness, thereby maintaining the overall electrical continuity of the shielding housing. The conductive elastic component 130 has elastic deformation characteristics and generates a pre-tightening force during the closing process of the protrusion and the groove, making the conductive elastic component 130 tightly fill the contact interface. This overcomes the small displacement of the housing caused by external vibration or thermal expansion and contraction, maintains a stable contact state between the first conductive housing 110 and the second conductive housing 120, can maintain the shielding effectiveness of the shielding housing for a long time, prevent electromagnetic leakage caused by loose contact, and ensure the anti-interference capability of the internal control component 200 in complex environments.

[0043] In one embodiment of the connector 140 of this application, such as Figure 1 and Figure 2 As shown, the electromagnetic isolation structure includes: a connector 140 disposed on the conductive housing assembly 100, the connector 140 having a through channel; a conductor retainer disposed inside the conductive housing assembly 100 and electrically connected to the conductive housing assembly 100, the connecting cable passing through the channel and electrically connected to the conductor retainer.

[0044] The shielding layer (conductor sheath) of the connecting cable contacts and achieves electrical connection with the conductor retainer. This structure tightly overlaps the shielding layer of the connecting cable with the conductive housing assembly 100 through the conductor retainer, forming a continuous conductive path. Electromagnetic interference introduced by the connecting cable is conducted through the shielding layer to the conductor retainer, and then through the conductor retainer into the conductive housing assembly 100. The conductive housing assembly 100 serves as a grounding path, discharging the interference current to the ground or a return loop. This process eliminates the electrical gap between the connecting cable and the housing through a 360-degree continuous overlap, reducing the coupling path of high-frequency interference signals. The good electrical connection between the conductive housing assembly 100 and the shielding layer ensures the continuity of shielding effectiveness, preventing interference signals from radiating or coupling into the internal circuitry of the device through gaps. The electrical connection between the conductor retainer and the conductive housing assembly 100 ensures the low impedance characteristics of the grounding loop, improving the device's anti-interference capability in complex electromagnetic environments.

[0045] Furthermore, connector 140 is a circular connector with a cadmium-plated aluminum alloy shell. After mating, it achieves 360° continuous shielding through its own threads. The second conductive housing 120 has a cable inlet hole with a diameter equal to or slightly smaller than the outer diameter of the connector thread, allowing only the connector tail to pass through, and is sealed with a conductive rubber gasket. The shielding layers of all external cables (including water level sensor cables, rain sensor cables, communication cables, and power cables) directly overlap with the inner wall of the housing at the entry point via 360° metal retainers. The upper cover and lower housing employ a labyrinthine overlap structure, with conductive rubber strips embedded at the contact surface, and fastening screws distributed around the perimeter of the contact surface.

[0046] In the specific implementation process, the conductive housing assembly 100 is provided with a magnetic suppression and exhaust channel. The first end of the magnetic suppression and exhaust channel is connected to the receiving cavity 150, and the second end of the magnetic suppression and exhaust channel is connected to the external space. The outer diameter of the magnetic suppression and exhaust channel is H, 2mm≤H≤3mm; the length of the magnetic suppression and exhaust channel is L, 8mm≤L≤12mm.

[0047] In this way, an airflow path is created on the conductive housing assembly 100 to facilitate air exchange between the interior of the containment cavity 150 and the external environment. Through air convection, the heat generated inside the containment cavity 150 can be dissipated to the external space in a timely manner, while cooler external air is introduced, thereby reducing the operating temperature of the control component 200 and preventing performance degradation or failure due to overheating. This ensures the stability of the electromagnetic isolation structure during long-term continuous use. The outer diameter H of the magnetic suppression exhaust channel is 2mm≤H≤3mm. By limiting the channel's geometry, its diameter is smaller than the wavelength of high-frequency electromagnetic waves commonly found in substation environments. When external electromagnetic waves attempt to enter the containment cavity 150 through this channel, the channel exhibits waveguide cutoff characteristics, significantly attenuating the penetration ability of the electromagnetic waves. This structural design, while meeting basic ventilation requirements, effectively prevents electromagnetic energy from leaking into the shielded cavity through pores, maintaining the electromagnetic shielding integrity of the metal shielding housing and reducing the impact of electromagnetic interference on the internal control component 200. The length of the magnetic suppression exhaust channel is L, with a range of 8mm ≤ L ≤ 12mm. By increasing the channel length, the propagation path of electromagnetic waves within the channel is extended. When electromagnetic waves pass through a channel with a limited aspect ratio, their energy attenuates rapidly with increasing propagation distance, further enhancing the suppression of high-frequency electromagnetic waves and ensuring effective blocking of electromagnetic radiation penetration even in the presence of the channel. By combining specific outer diameter and length parameters, the magnetic suppression exhaust channel achieves a balance between heat dissipation and electromagnetic shielding functions. This ensures the heat dissipation requirements of the control component 200 while preventing interference from strong external electromagnetic environments to the internal circuitry of the electromagnetic isolation structure, thus improving the overall electromagnetic compatibility of the equipment.

[0048] This application also provides a monitoring device, such as Figures 1 to 4 As shown, the monitoring device includes an electromagnetic isolation structure and further includes: a sensing component for sensing preset information of the target area; a control component 200 disposed within the conductive housing component 100; the output end of a conductor passes through the conductive housing component 100 and is connected to the control component 200, and the sensing component transmits the preset information to the control component 200 through the conductor.

[0049] The sensing components are used to acquire real-time water level and rainfall information in target areas (such as cable trenches and collection wells). The sensing components include a water level sensor and a tipping bucket rain gauge, respectively installed at the bottom of the cable trench and in the open area of ​​the substation ground. The sensing components convert the collected physical quantities into electrical signals, which are transmitted to the control component 200 through conductors in the connecting cables. The deployment location of the sensing components ensures the authenticity and real-time nature of the monitoring data, providing a reliable data foundation for subsequent risk assessment. The control component 200 receives water level and rainfall information from the conductors and generates early warning information. Due to the effective shielding of the conductive housing component 100, the control component 200 can operate in a low-noise environment, improving the accuracy of signal acquisition and processing. The conductive housing component 100 not only shields against external interference but also suppresses the leakage of electromagnetic radiation generated by the internal circuitry, meeting the electromagnetic compatibility standards for substations.

[0050] In this application, such as Figure 4 As shown, the monitoring device also includes: a protection circuit 30, which is disposed within the conductive housing assembly 100. The input terminal of the protection circuit 30 is used to connect to an external power supply cable, and the output terminal of the protection circuit 30 is connected to the control assembly 200. Along the direction of the input current of the protection circuit 30, a surge protection component 300 and a filter component 400 are connected in series on the protection circuit 30. Both the surge protection component 300 and the filter component 400 are disposed within the conductive housing assembly 100. The surge protection component 300 is used to discharge the surge current in the power supply current, and the surge protection component 300 is used to perform high-frequency filtering on the power supply current processed by the filter component 400 to filter out electromagnetic interference noise.

[0051] In this way, the external power supply current first enters the surge protection component 300. The surge protection component 300, through the action of its internal components, discharges the surge current in the power supply current to ground, thereby limiting the voltage peak. The processed current then enters the filter component 400. The filter component 400, through a filter network composed of capacitors, inductors, and other components, bypasses or absorbs high-frequency electromagnetic interference noise in the current. This series structure intercepts high-energy transient pulses at the front end through the surge protection component 300, protecting the subsequent filter component 400 from overvoltage damage. After the surge protection component 300, the filter component 400 further filters out the remaining high-frequency noise, ensuring the purity of the power supply to the control component 200. Both the surge protection component 300 and the filter component 400 are located within the conductive housing component 100, and the housing provides electromagnetic shielding to prevent external interference from coupling into the protection circuit 30. This cascaded protection structure, through the sequential processing of discharge followed by filtering, improves the overall immunity of the power input and ensures the stable operation of the control component 200 in complex electromagnetic environments.

[0052] Specifically, such as Figure 4As shown, the surge protection component 300 includes a gas discharge tube 310, a varistor 320, and a current-limiting resistor 330. Along the direction of the input current of the protection circuit 30, the gas discharge tube 310, the varistor 320, and the current-limiting resistor 330 are connected sequentially on the protection circuit 30; wherein, the gas discharge tube 310 and the varistor 320 are connected in parallel on the protection circuit 30, and the current-limiting resistor 330 is connected in series on the protection circuit 30.

[0053] In this way, when a high-amplitude surge voltage occurs in the power supply line, the gas discharge tube 310 first breaks down and conducts, forming a low-impedance path to discharge most of the surge current to ground. The varistor 320 is connected in parallel with the gas discharge tube 310, working in tandem before and after the gas discharge tube 310 operates to further clamp the line voltage and prevent it from exceeding the withstand limit of the subsequent circuitry. The current-limiting resistor 330 is connected in series in the discharge circuit to limit the peak current flowing through the gas discharge tube 310 and the varistor 320, preventing large currents from damaging these protective components. This structure handles high-energy surges through the gas discharge tube 310 and its high-current discharge capability, provides a fast voltage response through the varistor 320, and protects the upstream components through the current-limiting resistor 330. This combination, through a graded protection mechanism, effectively copes with surge impacts of different energy levels, ensuring that the protection circuit 30 remains functionally intact when subjected to surges caused by lightning strikes or switching operations, providing a safe power supply environment for the downstream filter component 400 and control component 200.

[0054] Specifically, such as Figure 4 As shown, the filter component 400 includes: a first inductor 410, a first capacitor 420, a second inductor 430, a second capacitor 440, and a filter grounding circuit. Along the direction of the input current of the protection circuit 30, the first inductor 410, the first capacitor 420, the second inductor 430, and the second capacitor 440 are connected in parallel to the protection circuit 30 in sequence. The input terminal of the filter grounding circuit is connected to the protection circuit 30, and the output terminal of the filter grounding circuit is used for grounding.

[0055] Thus, when current flows through the first inductor 410, it presents a high impedance to high-frequency noise, hindering the flow of high-frequency current. The first capacitor 420 provides a low-impedance path for the high-frequency noise, bypassing it to ground. When current flows through the second inductor 430, it further attenuates the remaining high-frequency noise. The second capacitor 440 again bypasses the high-frequency noise to ground. The filter grounding circuit discharges the residual noise current to ground through a low-impedance path. This structure, through the cascaded cooperation of two stages of inductors and capacitors, significantly improves the suppression capability of high-frequency electromagnetic interference. The first-stage filter initially filters out high-amplitude high-frequency noise, while the second-stage filter further refines the filtering effect. This multi-stage filtering mechanism reduces power supply ripple and noise to the control component 200 by gradually attenuating noise energy, ensuring high quality and high stability of the power supply.

[0056] Furthermore, the filtering grounding circuit includes a first grounding line and a second grounding line, and the protection circuit 30 includes a first polarity circuit 31 and a second polarity circuit 32. The input terminal of the first polarity circuit 31 is connected to the output terminal of the connecting cable, and the output terminal of the first polarity circuit 31 is connected to the input terminal of the control component 200. The input terminal of the second polarity circuit 32 is connected to the output terminal of the control component 200, and the output terminal of the second polarity circuit 32 is connected to the input terminal of the connecting cable. The input terminal of the first grounding line is connected to the first polarity circuit 31, and the output terminal of the first grounding line is used for grounding. The input terminal of the second grounding line is connected to the second polarity circuit 32, and the output terminal of the second grounding line is used for grounding. A first filtering capacitor is connected in series on the first grounding line, and a second filtering capacitor is connected in series on the second grounding line.

[0057] Thus, when a common-mode noise current exists in the first polarity circuit 31, this current flows to ground through the first grounding line. The first filter capacitor presents low impedance to high-frequency noise, bypassing the high-frequency noise to ground while blocking the DC component. When a common-mode noise current exists in the second polarity circuit 32, this current flows to ground through the second grounding line. The second filter capacitor presents low impedance to high-frequency noise, bypassing the high-frequency noise to ground while blocking the DC component. This structure processes the current of the positive and negative lines through the first polarity circuit 31 and the second polarity circuit 32 respectively, and achieves grounding through their respective first and second grounding lines. The first and second filter capacitors are connected in series on the grounding branch, enhancing the grounding loop's ability to suppress high-frequency interference. This bipolar independent grounding filtering mechanism reduces potential difference fluctuations between the positive and negative lines by providing an independent noise discharge path for each polarity line, improves the common-mode rejection ratio of the power supply system, and ensures that the control component 200 obtains a stable and clean power supply voltage.

[0058] Specifically, the first polarity circuit 31 and the second polarity circuit 32 are both connected to the grounding stud of the housing in a star configuration, without forming a loop with the internal circuit ground.

[0059] In this application, such as Figure 3 As shown, the conductive housing assembly 100 further includes: conductive isolation components 160, at least two conductive isolation components 160, which are spaced apart within the conductive housing assembly 100 to divide the conductive housing assembly 100 into at least three isolation chambers 170; multiple control components 200, each isolation chamber 170 being provided with a control component 200; the conductive housing assembly 100 includes a first inner wall surface, a bottom wall surface, a second inner wall surface, and a top wall surface connected in sequence, the first inner wall surface and the second inner wall surface being arranged opposite to each other, the bottom wall surface and the top wall surface being arranged opposite to each other, each conductive isolation component 160 being in contact with the first inner wall surface, the bottom wall surface, the second inner wall surface, and the top wall surface, and each conductive isolation component 160 being electrically connected to the conductive housing assembly 100, thereby blocking electromagnetic interference between two adjacent control components 200.

[0060] By setting physical partitions inside the shielding housing, the originally single accommodating space is divided into multiple independent shielding areas. Each isolation chamber 170 forms an independent Faraday cage to house specific electronic modules. Through this spatial division, circuit modules with different functions are physically isolated within their respective chambers, preventing direct electromagnetic coupling between modules and laying the structural foundation for subsequent signal isolation and interference suppression. Different functional units of the monitoring device, such as power management, signal conditioning, and data processing, are deployed in different isolation chambers 170. Through this distributed arrangement, the electromagnetic radiation generated by each control component 200 is confined within its respective isolation chamber 170, preventing direct interference with sensitive circuits in adjacent chambers. This distributed layout strategy effectively reduces the overall electromagnetic compatibility difficulty of the internal system, ensuring that each functional module can operate stably in a relatively independent electromagnetic environment. By tightly fitting the conductive isolation component 160 to each wall surface, gaps between the isolation wall and the main housing are eliminated, ensuring the integrity of shielding continuity. Utilizing the high conductivity and grounding characteristics of the conductive isolation component 160, a barrier for reflecting and absorbing high-frequency electromagnetic waves is constructed. When the control component 200 in the adjacent isolation compartment 170 is operating, the generated electromagnetic waves are reflected or absorbed when they encounter the conductive isolation component 160, and cannot penetrate to the adjacent compartment. Through this multi-layered shielding and isolation measure, the monitoring device effectively reduces the crosstalk of digital circuit noise to the analog signal acquisition circuit, improves the processing accuracy of weak signals such as water level and rainfall, and ensures the accuracy and reliability of flood monitoring data in complex electromagnetic environments.

[0061] Specifically, the conductive isolation component 160 is made of galvanized steel sheet.

[0062] Furthermore, at least three isolation chambers 170 include a first isolation chamber 181, a second isolation chamber 182, and a third isolation chamber 183. Multiple control components 200 include a battery control module 210, a controller module 220, and a sensor control module 230. The input terminal of the battery control module 210 is connected to the output terminal of the first polarity circuit 31, and the output terminal of the battery control module 210 is connected to the second polarity circuit 32. The battery control module 210 is located within the first isolation chamber 181. The controller module 220 is electrically connected to the battery control module 210, supplies current to the battery control module 210, and its output terminal is connected to an external warning device. The controller module 220 is located within the second isolation chamber 182. The input terminal of the sensor control module 230 is connected to the output terminal of a connecting cable, and its output terminal is connected to the controller module 220. The sensor control module 230 is located within the third isolation chamber 183.

[0063] In this way, the power management function is deployed independently, with the battery control module 210 responsible for converting external power supply or internal battery energy into a stable voltage suitable for internal circuitry. By placing it within the first isolation chamber 181, the high-frequency switching noise generated by the battery control module 210 is confined within this chamber, preventing it from directly interfering with other sensitive modules. The battery control module 210 supplies power to the controller module 220 and the sensor control module 230 via a power line, forming an energy supply path. The controller module 220, as the data processing core, receives monitoring data from the sensor control module 230, executes flood judgment logic, and sends early warning information to external early warning devices. Placing it within the second isolation chamber 182, the conductive isolation component 160 shields the electromagnetic radiation generated by its high-speed digital signals, preventing interference with analog signal acquisition and ensuring the reliability of control commands and data transmission. By placing the sensor control module 230 within the third isolation chamber 183, the sensor control module 230 amplifies, filters, and performs analog-to-digital conversion on weak signals, generating digital signals which are then transmitted to the controller module 220. This keeps the highly sensitive analog circuitry away from noisy digital and power circuits, minimizing internal crosstalk. Through the compartmentalized design of the first, second, and third isolation chambers 181 and 182, the monitoring device achieves physical isolation between power supply, digital processing, and analog signal acquisition. This significantly improves the signal-to-noise ratio of analog signal acquisition, enhances electromagnetic compatibility, and ensures the accuracy of flood monitoring data and the stability of system operation in strong electromagnetic environments.

[0064] Specifically, the sensing and control module 230 includes a signal conditioning and acquisition circuit, an instrumentation amplifier, a Schmitt trigger, and an analog-to-digital converter (ADC). The input of the signal conditioning and acquisition circuit is connected to the output of the connecting cable, the output of the signal conditioning and acquisition circuit is connected to the input of the instrumentation amplifier, the output of the instrumentation amplifier is connected to the input of the ADC, and the output of the ADC is connected to the controller module 220. The signal conditioning and acquisition circuit receives analog signals from the water level sensor. The instrumentation amplifier amplifies and filters the signal, and the ADC converts the analog signal into a digital signal and transmits it to the controller module 220. The output of the connecting cable is connected to the input of the Schmitt trigger, and the output of the Schmitt trigger is connected to the controller module 220. The Schmitt trigger shapes the pulse signal from the rain gauge sensor to eliminate high-frequency noise interference. The shaped pulse signal is then transmitted to the controller module 220, where it is counted to calculate the rainfall intensity.

[0065] The controller module 220 includes a controller, a memory, a wireless communication module, and an isolated RS485 transceiver. The memory is connected to the controller module 220 for bidirectional data transmission. The controller writes water level data, rainfall data, and early warning logs to the memory, or reads historical data from the memory for flood trend analysis. The memory ensures that monitoring data is not lost in the event of power failure, providing reliable data storage support for the system. The wireless communication module connects to the controller via a serial communication interface (such as UART, SPI, or SDIO). The controller packages the generated early warning information and real-time monitoring data and sends them to the wireless communication module through the serial interface. The wireless communication module is responsible for converting digital signals into wireless radio frequency signals and sending them to the remote management platform, realizing wireless data interaction between the monitoring device and the remote monitoring system, ensuring that early warning information can be uploaded in a timely manner.

[0066] The isolated RS485 transceiver connects to the controller via a serial communication interface. The controller connects its transmit and receive pins to the corresponding pins of the transceiver, sending digital signals to the transceiver. The isolated RS485 transceiver communicates with the controller module 220 using magnetic coupling isolation technology. Its power supply is provided separately by the battery control module 210, forming an electrical isolation barrier. The output of the isolated RS485 transceiver is protected to ground by a TVS diode before being connected to an external RS485 bus. This connection enables isolated communication between the controller module 220 and an external wired monitoring system, preventing external ground potential differences or surge interference from entering the controller module 220 via the RS485 bus and ensuring the safety of the internal circuitry.

[0067] The battery control module 210, comprising a DC-DC converter and a lithium battery protection circuit, is housed within the first isolation compartment 181. The input terminal of the DC-DC converter is connected to the first polarity circuit 31, receiving DC voltage from the battery or an external power source. The DC-DC converter converts the input voltage into a stable operating voltage required by the control component 200 through internal switching elements and inductor / capacitor energy storage elements. The output terminal of the DC-DC converter is connected to the second polarity circuit 32, providing a stable power supply to the controller module 220 and the sensor control module 230. The lithium battery protection circuit is connected in series between the battery pack and the DC-DC converter. The input terminal of the lithium battery protection circuit is connected to the positive terminal of the battery pack, and the output terminal is connected to the input terminal of the DC-DC converter. The lithium battery protection circuit is connected to the controller module 220, which reads the battery's state of charge, voltage, and current parameters, and controls the charging and discharging of the lithium battery protection circuit, achieving safe management and efficient conversion of battery energy. The DC-DC converter converts the unstable voltage of the battery into pure and stable DC power, while the lithium battery protection circuit provides overvoltage, undervoltage, and short-circuit protection. Together, they ensure that the monitoring device obtains a stable and reliable power supply in the complex electromagnetic environment of the substation, preventing the controller module 220 from being reset or data from being lost due to power fluctuations.

[0068] In the specific implementation process, a high-frequency impedance element is connected in series on the connecting cable, and the high-frequency impedance element is set inside the conductive housing assembly 100; the monitoring device includes: a grounding circuit, the input end of the grounding circuit is connected to the connecting cable, the output end of the grounding circuit is used for grounding, and a third capacitor component is connected in series on the grounding circuit.

[0069] By introducing high-frequency impedance elements (such as ferrite beads) into the signal transmission path, high impedance characteristics are presented to resist high-frequency electromagnetic interference. When external electromagnetic interference couples to the connecting cable and attempts to enter the shielded housing, the high-frequency impedance element impedes the passage of high-frequency noise current, thereby initially attenuating the interference signal before it enters the internal control component 200. This high-frequency impedance element is located inside the conductive housing component 100, ensuring that it is within the shielded protection range and preventing the element itself from becoming an interference receiving antenna, thus ensuring the stability of the filtering effect. A third capacitor component (such as a ceramic capacitor) allows high-frequency interference current to pass through and flow to the ground wire, while blocking DC or low-frequency normal operating current. Through the bypassing effect of the third capacitor component, the high-frequency common-mode or differential-mode noise current remaining on the connecting cable is guided to the grounding system and discharged to the ground, preventing external electromagnetic noise from coupling into the control component 200 through the cable inlet, reducing the risk of malfunction of the internal circuit, ensuring the acquisition accuracy and transmission stability of monitoring data such as water level and rainfall in strong electromagnetic environments, and improving the overall electromagnetic compatibility of the monitoring device.

[0070] Furthermore, the electrical parameters of high-frequency impedance components (such as ferrite beads) are 900Ω / 100MHz. Specifically, when the signal frequency passing through the ferrite bead is 100MHz, the impedance presented by the ferrite bead to that frequency signal is 900 ohms. Ferrite beads exhibit low impedance in the low-frequency range, allowing DC or low-frequency signals to pass smoothly; as the frequency increases, the ferrite material inside the ferrite bead generates magnetic losses, converting high-frequency noise energy into heat energy, thus exhibiting high impedance.

[0071] Specifically, the device employs a single-point grounding method to eliminate ground loop interference and reduce high-frequency noise coupling. The grounding of the filter circuits and connectors is directly connected to the grounding studs on the housing via wires or copper busbars. This direct connection utilizes the low impedance characteristics of the metal housing to provide the shortest discharge path for high-frequency interference currents, preventing interference currents from flowing through the ground plane of internal sensitive circuits. The core circuit board contains sensitive digital circuits such as the controller module 220. Its grounding layer is not directly connected to the housing grounding point, but is instead connected to the housing grounding stud 15 at a single point via a 10-100Ω ferrite bead or a 0Ω resistor. This ferrite bead or resistor exhibits low impedance at DC and low frequencies, ensuring consistent reference potential; at high frequencies, it exhibits high impedance, breaking the ground loop between the digital circuits and the power input, preventing high-frequency noise from being conducted from the core circuit area to the power filtering area. The circuit board wiring is physically divided into an input filtering area and a core circuit area. The PCB copper foil between the two areas is hollowed out to form an electrical isolation strip. A row of grounding vias with a spacing of less than 1mm is drilled along the dividing line; these vias, together with the shielding housing, form a complete electromagnetic isolation wall. This structure utilizes the high-frequency shielding effect of the grounding via array to block electromagnetic interference generated between the two areas through spatial radiation or edge coupling, ensuring that high-frequency noise in the input filtering area will not crosstalk to the core circuit area, thereby guaranteeing the signal integrity of the data processing module and the stability of the system.

[0072] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0073] The conductive housing assembly 100 is made of a metallic material, such as stainless steel, to form a Faraday cage structure. The conductive housing assembly 100 serves to block direct electromagnetic coupling between the external space and the internal circuitry. When external electromagnetic waves act on the electromagnetic isolation structure, the conductive housing assembly 100 attenuates the electromagnetic wave energy through reflection and absorption, preventing high-frequency interference signals from entering the interior. This metallic shielding structure significantly reduces the impact of external electromagnetic interference on the components inside the conductive housing assembly 100, ensuring stable operation of the components inside the conductive housing assembly 100 in a strong electromagnetic environment. This avoids system crashes, resets, or data errors caused by electromagnetic interference, thus improving the reliability of the monitoring device in harsh electromagnetic environments.

[0074] The conductor is responsible for transmitting signals containing preset information for data communication. A conductor sheath surrounds the conductor, serving to insulate and protect it, as well as blocking external magnetic field interference from affecting the transmission of water level and rainfall information signals within the conductor. When external magnetic field interference acts on the connecting cable, the conductor sheath reflects electromagnetic waves, thus preventing the interference from entering the conductor. This shielding prevents external magnetic field interference from coupling or distorting the water level and rainfall information signals during transmission, ensuring the purity and accuracy of the transmitted signals.

[0075] The conductor sheath, acting as a shielding layer, forms an electrical connection with the conductive housing assembly 100 at the point where the connecting cable enters, eliminating electromagnetic leakage gaps at the cable entry point and achieving continuity of the shielding. This design effectively cuts off the path of interference signals transmitted through the cable into the components inside the conductive housing assembly 100, preventing external interference from being injected into the internal control circuit through the signal line. Through the electrical connection between the conductor sheath and the conductive housing assembly 100, integrated protection from external shielding to cable entry shielding is achieved. The conductor sheath intercepts external magnetic field interference, ensuring that water level and rainfall information signals are not affected by external magnetic field interference during transmission within the conductor. This structure solves the problems of discontinuous shielding at the cable interface and easy introduction of external magnetic field interference into the internal control circuit through the cable in existing monitoring devices, achieving high reliability, high accuracy, and long service life operation of the substation flood monitoring device.

[0076] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0077] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0078] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0079] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electromagnetic isolation structure, characterized in that, include: Conductive housing assembly (100); A connecting cable, the connecting cable comprising: a conductor sheath and a conductor sequentially sleeved from the outside to the inside, the conductor passing through the conductive housing assembly (100), the conductor being used to transmit signals of preset information; The conductor sheath is electrically connected to the conductive housing assembly (100) and blocks electromagnetic waves outside the conductive housing assembly (100) through the conductive housing assembly (100).

2. The electromagnetic isolation structure according to claim 1, characterized in that, The conductive housing assembly (100) includes: First conductive housing (110); A second conductive housing (120) is electrically connected to the first conductive housing (110), and a receiving cavity (150) for accommodating the control assembly (200) is formed between the first conductive housing (110) and the second conductive housing (120). The connecting cable passes through the first conductive housing (110) or the second conductive housing (120), and the conductor sheath is electrically connected to both the first conductive housing (110) and the second conductive housing (120). The output end of the conductor passes through the first conductive housing (110) or the second conductive housing (120) and is connected to the control component (200).

3. The electromagnetic isolation structure according to claim 2, characterized in that, The first conductive housing (110) is provided with protrusions that extend along the circumferential direction of the first conductive housing (110), and the second conductive housing (120) is provided with grooves; or, The first conductive housing (110) is provided with a groove, which extends along the circumferential direction of the first conductive housing (110), and the second conductive housing (120) is provided with a protrusion, which extends along the circumferential direction of the second conductive housing (120). The protrusion is embedded in the groove so that the first conductive housing (110) is connected to the second conductive housing (120).

4. The electromagnetic isolation structure according to claim 3, characterized in that, The conductive housing assembly (100) further includes: A conductive elastic component (130) is embedded in the groove. The two sides of the conductive elastic component (130) are respectively attached to the protrusion and the groove so that the first conductive housing (110) and the second conductive housing (120) are electrically connected.

5. The electromagnetic isolation structure according to claim 1, characterized in that, The electromagnetic isolation structure includes: A connector (140) is disposed on the conductive housing assembly (100), and the connector (140) is provided with a through-channel; A conductor retainer is disposed within and electrically connected to the conductive housing assembly (100), and the connecting cable passes through the through-channel and is electrically connected to the conductor retainer.

6. The electromagnetic isolation structure according to claim 2, characterized in that, The conductive housing assembly (100) is provided with a magnetic suppression and exhaust channel. The first end of the magnetic suppression and exhaust channel is connected to the receiving cavity (150), and the second end of the magnetic suppression and exhaust channel is connected to the external space. The outer diameter of the magnetic suppression exhaust channel is H, where 2mm ≤ H ≤ 3mm; the length of the magnetic suppression exhaust channel is L, where 8mm ≤ L ≤ 12mm.

7. A monitoring device, characterized in that, The monitoring device includes an electromagnetic isolation structure, and the monitoring device further includes: Sensing components are used to sense preset information about the target area; A control component (200) is disposed within the conductive housing assembly (100); the output end of the conductor passes through the conductive housing assembly (100) and is connected to the control component (200); the sensing component transmits the preset information signal to the control component (200) through the conductor; and the electromagnetic isolation structure is the electromagnetic isolation structure according to any one of claims 1 to 6.

8. The monitoring device according to claim 7, characterized in that, The monitoring device also includes: A protective circuit (30) is disposed within the conductive housing assembly (100). The input terminal of the protective circuit (30) is used to connect to an external power supply cable, and the output terminal of the protective circuit (30) is connected to the control assembly (200). Along the direction of the input current of the protection circuit (30), a surge protection component (300) and a filter component (400) are connected in series on the protection circuit (30). The surge protection component (300) and the filter component (400) are both disposed in the conductive housing assembly (100). The surge protection component (300) is used to discharge the surge current in the power supply current. The surge protection component (300) is used to perform high-frequency filtering on the power supply current after it has been processed by the filter component (400) to filter out electromagnetic interference noise.

9. The monitoring device according to claim 8, characterized in that, The surge protection component (300) includes: The gas discharge tube (310), the varistor (320), and the current limiting resistor (330) are connected sequentially to the protection circuit (30) along the direction of the input current of the protection circuit (30). The gas discharge tube (310) and the varistor (320) are connected in parallel on the protection circuit (30), and the current limiting resistor (330) is connected in series on the protection circuit (30).

10. The monitoring device according to claim 9, characterized in that, The filtering component (400) includes: The first inductor (410), the first capacitor (420), the second inductor (430), the second capacitor (440), and the filter grounding circuit are connected in parallel to the protection circuit (30) in sequence along the direction of the input current of the protection circuit (30). The input terminal of the filter grounding circuit is connected to the protection circuit (30), and the output terminal of the filter grounding circuit is used for grounding.

11. The monitoring device according to claim 7, characterized in that, The conductive housing assembly (100) further includes: A conductive isolation component (160), wherein there are at least two conductive isolation components (160), and at least two of the conductive isolation components (160) are spaced apart within the conductive housing assembly (100) to divide the conductive housing assembly (100) into at least three isolation compartments (170). There are multiple control components (200), and each of the isolation chambers (170) is provided with a control component (200). The conductive housing assembly (100) includes a first inner wall surface, a bottom wall surface, a second inner wall surface, and a top wall surface connected in sequence. The first inner wall surface and the second inner wall surface are arranged opposite to each other, and the bottom wall surface and the top wall surface are arranged opposite to each other. Each of the conductive isolation components (160) is attached to the first inner wall surface, the bottom wall surface, the second inner wall surface, and the top wall surface, and each of the conductive isolation components (160) is electrically connected to the conductive housing assembly (100). The conductive isolation components (160) block electromagnetic interference between two adjacent control components (200).

12. The monitoring device according to claim 7, characterized in that, A high-frequency impedance element is connected in series on the connecting cable, and the high-frequency impedance element is disposed inside the conductive housing assembly (100); The monitoring device includes: A grounding circuit is provided, the input terminal of which is connected to the connecting cable, the output terminal of which is used for grounding, and a third capacitor component is connected in series in the grounding circuit.

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