Bridging grounding system for bridge

Abstract

The invention relates to the technical field of cable bridges, in particular to a bridging grounding system for a bridge, which comprises a grounding unit used for conducting leakage current on the bridge to a target grounding position, comprising a plurality of corresponding flat steel sections which are fixedly connected with a plurality of bridge shells, a plurality of grounding main lines which are connected with the plurality of corresponding flat steel sections, and connecting pieces which are arranged between two adjacent flat steel sections and are used for transmitting the leakage current from the front flat steel section to the adjacent flat steel section; the detection unit is connected with the grounding unit and is used for detecting the conduction current of the corresponding detection section; and the control unit is respectively connected with the grounding unit and the detection unit and is used for determining the estimated distribution length of the pollutants on the flat steel section according to the impedance value variable quantity of the connecting piece in the monitoring period in which the impedance changes and the sudden change period of the breakover current. According to the invention, the accuracy of detecting the impedance between the flat steel section and the connecting piece is improved.

Description

Technical Field

[0001] This invention relates to the field of cable tray technology, and more particularly to a bridging grounding system for cable trays. Background Technology

[0002] Cable trays are devices used to fix cables. They are secured by supports / hangers, and grounding of the cable tray is a crucial consideration. When the total length of the cable tray is no more than 30m, it should be connected to the grounding mains at at least two points. When the total length of the cable tray is greater than 30m, an additional connection point to the grounding mains should be added every 20-30 meters. The beginning and end ends of the cable tray should be reliably connected to the grounding mains. Cable trays are generally divided into 2-meter sections, and jumper wires should be installed between sections to ensure the integrity of the electrical continuity and good electrical contact of the cable tray grounding system.

[0003] Chinese Patent Publication No. CN217903880U discloses a grounding system for a metal cable tray, comprising a grounding grid and a cable tray body. The grounding grid is connected to a grounding plate, and a first grounding wire is connected between the cable tray body and the grounding plate. The grounding plate is connected to a second grounding wire for connecting to conductors surrounding the cable tray body. It is evident that the grounding system for this metal cable tray suffers from a problem: during the conduction of leakage current from the cable tray to the corresponding grounding point by the flat steel sections and connectors, corrosion occurs at the connection points between the connectors and the flat steel sections. This corrosion causes contaminants from the connection gaps between the flat steel sections and the connectors to spread onto the flat steel sections, resulting in a decrease in the accuracy of impedance detection. Summary of the Invention

[0004] Therefore, the present invention provides a bridging grounding system for cable trays to overcome the problem in the prior art where, during the process of conducting leakage current from the cable tray to the corresponding grounding point, the connection between the flat steel section and the connector is corroded, causing contaminants in the connection gap between the flat steel section and the connector to spread onto the flat steel section, thereby reducing the accuracy of impedance detection.

[0005] To achieve the above objectives, the present invention provides a bridging grounding system for cable trays, comprising: a grounding unit for conducting leakage current appearing on the cable tray to a target grounding location, including a plurality of corresponding flat steel sections fixedly connected to a plurality of cable tray housings, a plurality of grounding trunk lines connected to the plurality of corresponding flat steel sections, and a connector disposed between two adjacent flat steel sections for transmitting the leakage current from the front flat steel section to the adjacent flat steel section;

[0006] A detection unit, which is connected to the grounding unit, is used to detect the conduction current of the corresponding detection section;

[0007] The control unit, which is connected to the grounding unit and the detection unit respectively, is used to determine the estimated distribution length of pollutants on the flat steel section based on the amount of impedance change of the connector and the abrupt change period of the conduction current during the monitoring period in which impedance changes occur, to determine the unconnectable area of ​​the test point on the flat steel section based on the estimated distribution length, and to adjust the position of the test point based on the difference between the impedance peak value of the first test section and the impedance peak value of the second test section.

[0008] Furthermore, the first test section is the entire area formed by the non-connectable area and the connector, and the second test section is the entire area formed by the test points outside the non-connectable area, the non-connectable area, and the connector.

[0009] Furthermore, the connector includes:

[0010] The conductive part is fixedly connected to the cable tray housing. A first connecting part is provided on the side of the conductive part that connects to the flat steel section, and a second connecting part is provided on the other side of the conductive part away from the first connecting part.

[0011] Wherein, the extension lines of the first connecting part and the second connecting part on the plane of the conductive part are perpendicular to each other; both the first connecting part and the second connecting part include two parallel conductive plates; the first connecting part and the second connecting part are respectively threaded to the corresponding flat steel segment.

[0012] Furthermore, the control unit is connected to the detection unit to determine that the corrosion type is corrosion occurring in the connection gap of the flat steel section near the conductive part between the two conductive sheets, based on the fact that the change in the impedance value is greater than a preset change and the abrupt change period of the conduction current is less than a preset abrupt change period.

[0013] Furthermore, the control unit is connected to the detection unit and is also used to determine that the corrosion type is corrosion occurring at the connection gap between the two conductive sheets near the flat steel section and the flat steel section, based on the fact that the change in the impedance value is greater than a preset change and the abrupt change period of the conduction current is greater than or equal to a preset abrupt change period.

[0014] Furthermore, the control unit, connected to the detection unit, is also used to determine the estimated distribution length of contaminants on the flat steel segment based on the difference between the average abrupt change period and the preset abrupt change period, under the condition that the change in impedance value is greater than a preset change and the abrupt change period of the conduction current is greater than or equal to a preset abrupt change period.

[0015] The average mutation period is the average value of the mutation periods corresponding to several test points, and the estimated distribution length is negatively correlated with the average mutation period.

[0016] Furthermore, the formula for calculating the estimated distribution length is: L = L0 - k × ΔT;

[0017] Where L: estimated distribution length, L0: standard distribution length, k: length conversion coefficient, ΔT: the difference between the average mutation period and the preset mutation period.

[0018] Furthermore, the control unit is connected to the detection unit and is also used to divide the flat steel segment whose distance from the connection point between the flat steel segment and the connector is the estimated distribution length into an area that cannot be connected.

[0019] Furthermore, the control unit is connected to the detection unit and is used to move the test point toward the direction of the unconnectable area according to the difference amount being greater than a preset difference amount, wherein the difference amount is the difference between the impedance peak value of the first test section and the impedance peak value of the second test section.

[0020] Furthermore, the distance by which the test point is moved toward the direction of the unconnectable area is positively correlated with the amount of difference.

[0021] Compared with the prior art, the beneficial effect of the present invention is that, by judging the corrosion type of the connection gap between the connector and the flat steel segment based on the change in impedance value and the abrupt change period of the conduction current, the present invention addresses the issue that the connection gap near the conductive part of the flat steel segment contains a burr-like material distribution, which more easily traps moisture, preventing it from flowing out and causing a chain of inward corrosion. Furthermore, the contact resistance generated by corrosion of the connection gap near the conductive part of the flat steel segment, compared to corrosion of the side of the conductive sheet near the flat steel segment, is more likely to cause a sudden change in current. Therefore, the corrosion type can be distinguished by the abrupt change period of the conduction current, solving the problem of inaccurate test point selection by the detection unit on the flat steel segment due to the inability to distinguish corrosion types. This improves the accuracy of test point selection and the accuracy of detecting the impedance between the flat steel segment and the connector.

[0022] Furthermore, by determining the estimated distribution length of contaminants on the flat steel segment based on the abrupt change period of the conduction current, and determining the non-connectable area of ​​the test point on the flat steel segment based on the estimated distribution length, the corrosion occurring at the connection gap between the conductive sheet and the flat steel segment on the side close to the flat steel segment may cause the corroded contaminants to scatter towards the flat steel segment and adhere to its surface. This results in contact resistance when the test point is set on the flat steel segment with attached contaminants, affecting the accuracy of the detection. This solves the problem of inaccurate detection of the impedance between the flat steel segment and the connector when the test point is set on the flat steel segment with attached contaminants, and improves the accuracy of detecting the impedance between the flat steel segment and the connector.

[0023] Furthermore, by adjusting the position of the test point based on the difference between the peak impedance of the first test section and the peak impedance of the second test section, the problem of increasing resistance and temperature is solved when the difference is greater than the preset difference, indicating that the test point selected from outside the unconnectable area is too far from the unconnectable area. This temperature increase is then conducted to the connector, affecting the resistance of the connector and thus affecting the accuracy of detecting the impedance between the flat steel section and the connector. This improves the accuracy of detecting the impedance between the flat steel section and the connector.

[0024] Furthermore, the estimated distribution length of contaminants on the flat steel segment is determined based on the difference between the average mutation period and the preset mutation period, where the estimated distribution length is negatively correlated with the average mutation period. Since a smaller mutation period indicates more frequent current mutations, it means faster corrosion occurs at the connection gap between the conductive sheet and the flat steel segment. In humid environments, this leads to a greater total amount of contaminants that may scatter and adhere to the surface of the flat steel segment, resulting in a higher probability of a larger area of ​​contaminants adhering to the flat steel segment. This solves the problem of inaccurate determination of the estimated distribution length of contaminants on the flat steel segment and improves the accuracy of this determination. Attached Figure Description

[0025] Figure 1 This is a structural diagram of a bridging grounding system for cable trays according to an embodiment of the present invention;

[0026] Figure 2 This is a side view of a connector used in a bridging grounding system for cable trays according to an embodiment of the present invention;

[0027] Figure 3 This is a top view of a connector used in a bridging grounding system for cable trays according to an embodiment of the present invention;

[0028] Figure 4 This is a structural block diagram of a bridging grounding system for cable trays according to an embodiment of the present invention;

[0029] In the diagram, 1-flat steel section, 2-grounding trunk line, 3-connector, 4-cable tray, 31-conductive part, 32-first connecting part, 33-second connecting part, 321-conductive sheet. Detailed Implementation

[0030] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0031] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0032] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0033] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The figures shown are a structural diagram, a side view of the connector, a top view of the connector, and a structural block diagram of the bridging grounding system for cable trays according to an embodiment of the present invention.

[0035] The present invention provides a bridging grounding system for cable trays, comprising:

[0036] The grounding unit is used to conduct the leakage current appearing on the cable tray 4 to the target grounding location. It includes several corresponding flat steel sections 1 that are fixedly connected to the outer shell of several cable trays 4, several grounding trunk lines 2 that are connected to the several corresponding flat steel sections 1, and a connecting piece 3 that is disposed between two adjacent flat steel sections 1 to transfer the leakage current from the front flat steel section 1 to the adjacent flat steel section 1.

[0037] A detection unit, which is connected to the grounding unit, is used to detect the conduction current of the corresponding detection section;

[0038] The control unit, which is connected to the grounding unit and the detection unit respectively, is used to determine the estimated distribution length of pollutants on the flat steel section 1 based on the amount of impedance change of the connector 3 and the abrupt change period of the conduction current during the monitoring period in which impedance changes occur, to determine the non-connectable area of ​​the test point on the flat steel section 1 based on the estimated distribution length, and to adjust the position of the test point based on the difference between the impedance peak value of the first test section and the impedance peak value of the second test section.

[0039] Specifically, the first test section is the entire area formed by the non-connectable area and the connector 3, and the second test section is the entire area formed by the test points outside the non-connectable area, the non-connectable area, and the connector 3.

[0040] In implementation, the estimated distribution length of contaminants on the flat steel segment 1 is determined based on the abrupt change period of the conduction current. The unconnectable area of ​​the test point on the flat steel segment 1 is determined based on the estimated distribution length. Due to corrosion of the connection gap between the conductive sheet 321 and the flat steel segment 1 on the side close to the flat steel segment 1, the corroded contaminants may scatter towards the flat steel segment 1 and adhere to its surface. This results in contact resistance when the test point is set on the flat steel segment 1 with attached contaminants, affecting the accuracy of the detection. This solves the problem of inaccurate detection of the impedance between the flat steel segment 1 and the connector 3 when the test point is set on the flat steel segment 1 with attached contaminants, and improves the accuracy of detecting the impedance between the flat steel segment 1 and the connector 3.

[0041] Specifically, the estimated distribution length is the furthest point where pollutants released from the corrosion of the connection gap between the two conductive sheets 321 and the flat steel section 1 can reach the flat steel section 1.

[0042] Specifically, the detection unit includes:

[0043] Two connecting terminals are respectively connected to the two ends of the section to be tested on the connector 3 or the flat steel section 1;

[0044] A wire is positioned between two connecting terminals;

[0045] A current sensor, connected to the wire, is used to detect the conduction current of the section under test;

[0046] A power source, which is connected to the aforementioned wire.

[0047] Specifically, the detection circuit consists of the section to be tested, two connection terminals, wires, a current sensor, and a power supply.

[0048] Specifically, the connector 3 includes:

[0049] The conductive part 31 is fixedly connected to the outer shell of the cable tray 4. A first connecting part 32 is provided on the side of the conductive part 31 that is connected to the flat steel section 1, and a second connecting part 33 is provided on the other side of the conductive part 31 that is away from the first connecting part 32.

[0050] Wherein, the extension lines of the first connecting part 32 and the second connecting part 33 on the plane of the conductive part 31 are perpendicular to each other; the first connecting part 32 and the second connecting part 33 each include two parallel conductive sheets 321; the first connecting part 32 and the second connecting part 33 are respectively threaded to the corresponding flat steel section 1.

[0051] Specifically, the conductive part 31 is a metal plate.

[0052] Specifically, the control unit is connected to the detection unit and is used to determine that the corrosion type is corrosion occurring in the connection gap of the flat steel section 1 near the conductive part 31 between the two conductive sheets 321, based on the fact that the change in the impedance value is greater than a preset change and the abrupt change period of the conduction current is less than a preset abrupt change period.

[0053] Specifically, based on the corrosion occurring in the connection gap of the flat steel section 1 located between the two conductive plates 321 near the conductive part 31, the control unit determines that maintenance is required and issues maintenance information.

[0054] Specifically, the control unit is connected to the detection unit and is also used to determine that the corrosion type is corrosion occurring at the connection gap between the two conductive sheets 321 and the flat steel section 1 on the side near the flat steel section 1, based on the fact that the change in the impedance value is greater than a preset change and the abrupt change period of the conduction current is greater than or equal to a preset abrupt change period.

[0055] Optionally, under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH, the preset mutation period of the grounding unit is generally taken in the range of [5s, 15s].

[0056] Preferably, under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH, the preferred embodiment of the preset mutation period for the grounding unit is 10s.

[0057] Those skilled in the art will understand that [5s, 15s] and 10s represent several optional and preferred embodiments of the grounding unit under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH. In practical applications or implementations, those skilled in the art can adaptively adjust the preset mutation cycle according to the actual application environment and application scenario.

[0058] In practice, the corrosion type of the connection gap between the connector 3 and the flat steel segment 1 is determined by the change in impedance value and the abrupt change period of the conduction current. Since there is a burr-like material distribution inside the connection gap near the conductive part 31 of the flat steel segment 1, and this burr distribution makes it easier to trap moisture, causing moisture to enter but not flow out, resulting in a chain of inward corrosion. Furthermore, the contact resistance generated by corrosion of the connection gap near the conductive part 31 of the flat steel segment 1 compared to corrosion of the side of the conductive sheet 321 near the flat steel segment 1 makes it easier for abrupt changes in current to occur. Therefore, the corrosion type can be distinguished by the abrupt change period of the conduction current, solving the problem of inaccurate selection of test points on the flat steel segment 1 by the detection unit due to the inability to distinguish corrosion types. This improves the accuracy of test point selection and the accuracy of detecting the impedance between the flat steel segment 1 and the connector 3.

[0059] Optionally, under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH, the preset variation of the grounding unit generally takes the value range of [0.05Ω, 0.10Ω] in practice.

[0060] Preferably, the grounding unit has a preset variation of 0.08Ω under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH.

[0061] Those skilled in the art will understand that [0.05Ω, 0.10Ω] and 0.08Ω represent several optional and preferred embodiments of the grounding unit under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH. In practical applications or implementations, those skilled in the art can adaptively adjust the preset variation amount according to the actual application environment and application scenario.

[0062] Specifically, the control unit is connected to the detection unit and is further configured to determine the estimated distribution length of contaminants on the flat steel segment 1 based on the difference between the average abrupt change period and the preset abrupt change period, under the condition that the change in impedance value is greater than a preset change and the abrupt change period of the conduction current is greater than or equal to a preset abrupt change period.

[0063] The average mutation period is the average value of the mutation periods corresponding to several test points, and the estimated distribution length is negatively correlated with the average mutation period.

[0064] Specifically, the formula for calculating the estimated distribution length is: L = L0 - k × ΔT;

[0065] Where L: estimated distribution length, L0: standard distribution length, k: length conversion coefficient, ΔT: the difference between the average mutation period and the preset mutation period.

[0066] Specifically, the length conversion coefficient is the amount of length change in which contaminants in the connection gap between the flat steel segment 1 and the connector 3 are dispersed onto the flat steel segment 1 under a unit average mutation period.

[0067] In implementation, the estimated distribution length of contaminants on the flat steel segment 1 is determined based on the difference between the average mutation period and the preset mutation period. The estimated distribution length is negatively correlated with the average mutation period. Since a smaller mutation period indicates more frequent current mutations, it means faster corrosion occurs at the connection gap between the conductive sheet 321 and the flat steel segment 1. In a humid environment, this leads to a greater amount of contaminants that may scatter and adhere to the surface of the flat steel segment 1, resulting in a higher probability of a larger area of ​​contaminants adhering to the flat steel segment 1. This solves the problem of inaccurate determination of the estimated distribution length of contaminants on the flat steel segment 1 and improves the accuracy of this determination.

[0068] Specifically, the control unit is connected to the detection unit and is also used to divide the flat steel segment 1, whose estimated distribution length is at the distance from the connection point between the flat steel segment 1 and the connector 3, into an area that cannot be connected.

[0069] Specifically, the control unit is connected to the detection unit and is used to move the test point toward a direction closer to the unconnectable area based on the difference being greater than a preset difference. The difference is the difference between the impedance peak value of the first test section and the impedance peak value of the second test section.

[0070] Optionally, under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH, the preset difference value of the grounding unit generally takes a range of [0.02Ω, 0.04Ω] in practice.

[0071] Preferably, under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH, the preferred embodiment of the grounding unit has a preset difference of 0.03Ω.

[0072] Those skilled in the art will understand that [0.02Ω, 0.04Ω] and 0.03Ω represent several optional and preferred embodiments of the grounding unit under external conditions of temperature: 35℃~40℃ and humidity: 70%RH~90%RH. In practical applications or implementations, those skilled in the art can adaptively adjust the preset difference amount according to the actual application environment and application scenario.

[0073] In practice, by adjusting the position of the test point according to the difference between the peak impedance of the first test section and the peak impedance of the second test section, the problem of the test point being too far from the unconnectable area when the difference is greater than the preset difference is solved. This causes the resistance to increase, which in turn leads to an increase in temperature. The increased temperature is then conducted to the connector 3, affecting the resistance of the connector 3 and thus affecting the accuracy of detecting the impedance between the flat steel section 1 and the connector 3. This improves the accuracy of detecting the impedance between the flat steel section 1 and the connector 3.

[0074] Specifically, the distance by which the test point is moved toward the direction of the unconnectable area is positively correlated with the amount of difference.

[0075] In practice, when the grounding unit is exposed to external conditions of temperature (35℃~40℃) and humidity (70%RH~90%RH), if the difference in resistance is within 0.01Ω of the preset difference, the test point is moved 1cm closer to the non-connectable area. If the difference exceeds 0.01Ω, the distance the test point is moved closer to the non-connectable area is increased by 1cm for every 0.01Ω increase.

[0076] For example, in one possible embodiment, the difference is greater than the preset difference by 0.02Ω. In this case, the test point is moved a distance of 1cm + 1cm = 2cm towards the direction of the unconnectable area.

[0077] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A bridging grounding system for cable trays, characterized in that, include: A grounding unit, used to conduct leakage current appearing on the cable tray to a target grounding location, includes several corresponding flat steel sections fixedly connected to several cable tray shells, several grounding trunk lines connected to the several corresponding flat steel sections, and a connecting piece disposed between two adjacent flat steel sections to transfer the leakage current from the front flat steel section to the adjacent flat steel section. A detection unit, which is connected to the grounding unit, is used to detect the conduction current of the corresponding detection section; The control unit, which is connected to the grounding unit and the detection unit respectively, is used to determine the estimated distribution length of pollutants on the flat steel section based on the amount of impedance change of the connector and the abrupt change period of the conduction current during the monitoring period in which impedance changes occur, to determine the unconnectable area of ​​the test point on the flat steel section based on the estimated distribution length, and to adjust the position of the test point based on the difference between the impedance peak value of the first test section and the impedance peak value of the second test section.

2. The bridging grounding system for cable trays according to claim 1, characterized in that, The first test section is the entire area formed by the non-connectable area and the connector, and the second test section is the entire area formed by the test points outside the non-connectable area, the non-connectable area, and the connector.

3. The bridging grounding system for cable trays according to claim 2, characterized in that, The connector includes: The conductive part is fixedly connected to the cable tray housing. A first connecting part is provided on the side of the conductive part that connects to the flat steel section, and a second connecting part is provided on the other side of the conductive part away from the first connecting part. Wherein, the extension lines of the first connecting part and the second connecting part on the plane of the conductive part are perpendicular to each other; both the first connecting part and the second connecting part include two parallel conductive plates; the first connecting part and the second connecting part are respectively threaded to the corresponding flat steel segment.

4. The bridging grounding system for cable trays according to claim 3, characterized in that, The control unit is connected to the detection unit and is used to determine that the corrosion type is corrosion occurring in the connection gap of the flat steel section near the conductive part between the two conductive sheets, based on the fact that the change in the impedance value is greater than a preset change and the abrupt change period of the conduction current is less than a preset abrupt change period.

5. The bridging grounding system for cable trays according to claim 4, characterized in that, The control unit is connected to the detection unit and is also used to determine that the corrosion type is corrosion occurring at the connection gap between the two conductive sheets near the flat steel section and the flat steel section, based on the fact that the change in the impedance value is greater than a preset change and the abrupt change period of the conduction current is greater than or equal to a preset abrupt change period.

6. The bridging grounding system for cable trays according to claim 5, characterized in that, The control unit is connected to the detection unit and is further configured to determine the estimated distribution length of contaminants on the flat steel segment based on the difference between the average abrupt change period and the preset abrupt change period, under the condition that the change in impedance value is greater than a preset change and the abrupt change period of the conduction current is greater than or equal to a preset abrupt change period. The average mutation period is the average value of the mutation periods corresponding to several test points, and the estimated distribution length is negatively correlated with the average mutation period.

7. The bridging grounding system for cable trays according to claim 6, characterized in that, The formula for calculating the estimated distribution length is: L = L0 - k × ΔT; Where L: estimated distribution length, L0: standard distribution length, k: length conversion coefficient, ΔT: the difference between the average mutation period and the preset mutation period.

8. The bridging grounding system for cable trays according to claim 7, characterized in that, The control unit is connected to the detection unit and is also used to divide the flat steel segment whose distance from the connection point between the flat steel segment and the connector is the estimated distribution length into an area that cannot be connected.

9. The bridging grounding system for cable trays according to claim 8, characterized in that, The control unit is connected to the detection unit and is used to move the test point toward the direction of the unconnectable area according to the difference amount being greater than a preset difference amount, wherein the difference amount is the difference between the impedance peak value of the first test section and the impedance peak value of the second test section.

10. The bridging grounding system for cable trays according to claim 9, characterized in that, The distance the test point is moved toward the unconnectable area is positively correlated with the amount of difference.

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