A steel structure bridge induced voltage remote monitoring special device and a monitoring method
By setting up multiple measuring points on steel structure bridges and the ground, and using point-to-point differential measurement and historical sliding median value discrimination, the long-term stability problem of induced voltage monitoring on steel structure bridges was solved, realizing unattended monitoring and anomaly identification in complex environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-07
- Publication Date
- 2026-07-03
AI Technical Summary
In existing technologies, it is difficult to achieve long-term stable unattended monitoring of induced voltage in steel structure bridges. Furthermore, the zero potential reference is easily interfered with, leading to unstable measurement results. Manual measurement methods have limited coverage, while automatic monitoring schemes are complex and susceptible to interference.
The system employs a point-to-point differential measurement method, establishing measurement channels by setting up multiple measuring points on steel structure bridges and the ground. It utilizes data acquisition and processing units for real-time data analysis, and combines local caching and wireless transmission to achieve remote monitoring. It adopts an anomaly event discrimination method based on historical sliding median values and supports breakpoint retransmission.
It enables long-term, stable, and continuous monitoring of induced voltage in complex electromagnetic environments. The device has low power consumption, is suitable for solar power supply, supports unattended operation, and can automatically identify abnormal events and perform remote storage and evaluation.
Smart Images
Figure CN122330490A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of steel structure bridge monitoring technology, specifically relating to a special device and method for remote monitoring of induced voltage in steel structure bridges. Background Technology
[0002] With the rapid development of electrified railways in my country, the alternating electromagnetic fields generated by the overhead contact system of high-speed railways during operation can induce significant induced voltages on adjacent steel bridge structures. Due to the conductive continuity of steel structures, when personnel simultaneously contact charged steel components and the ground, or stand with both feet at different locations on the ground with potential gradients, contact voltage or step voltage may be generated, posing a potential risk to the safety of railway maintenance personnel and the public. Therefore, long-term, continuous, and remote monitoring of induced voltages on steel bridge structures is of significant engineering safety importance.
[0003] In existing technologies, monitoring of induced voltage in steel bridge structures mainly relies on manual on-site measurements using portable voltmeters or automatic monitoring devices based on absolute potential measurement. Manual measurement is limited by the timing and coverage of measurement points, making it difficult to capture the dynamic changes in induced voltage. Existing automatic monitoring schemes typically require pre-establishing a zero-potential reference point or relying on automatic zero-potential determination algorithms to convert the potential of each measurement point into an absolute potential value relative to zero before differential calculation. However, in the complex electromagnetic environment along railway lines, the zero-potential reference is susceptible to drift due to changes in grounding resistance, ground current interference, and soil potential fluctuations, leading to unstable measurement results. Furthermore, absolute potential measurement methods are easily affected by power frequency electromagnetic field interference, have complex measurement circuits, and are difficult to implement for long-term stable unattended monitoring. Summary of the Invention
[0004] This invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a special equipment and method for remote monitoring of induced voltage in steel structure bridges.
[0005] The technical solution of this invention is: a special device for remote monitoring of induced voltage in steel structure bridges, comprising: Front-end measuring points are set up on the steel structure bridge and the ground around the piers; The signal access unit is connected to the front-end measuring point and receives the measurement signal from the measuring point. The data acquisition and processing unit is connected to the signal access unit, receives the acquired signals and outputs the monitoring data; The abnormal event detection unit is connected to the data acquisition and processing unit, receives monitoring data, and detects abnormal events. The local cache unit is connected to the abnormal event discrimination unit and receives and caches monitoring data.
[0006] Furthermore, the local cache unit also communicates with the wireless transmission unit, which wirelessly transmits the monitoring data cached in the local cache unit.
[0007] Furthermore, the output of the wireless transmission unit is connected to a remote server, which remotely stores the monitoring data.
[0008] Furthermore, the front-end measuring points include steel structure measuring points and ground measuring points.
[0009] Furthermore, the steel structure measuring points include a first steel structure measuring point and a second steel structure measuring point. The first steel structure measuring point is located in the area of the steel beam at the top of the frame pier, and the second steel structure measuring point is located in the steel structure position at the base of the frame pier.
[0010] Furthermore, the ground measuring points include a third ground measuring point, a fourth ground measuring point, a fifth ground measuring point, and a sixth ground measuring point, which are arranged along the direction away from the pier.
[0011] Furthermore, the first steel structure measuring point, the second steel structure measuring point, the third ground measuring point, the fourth ground measuring point, the fifth ground measuring point, and the sixth ground measuring point are established using a point-to-point differential measurement method to create a measurement channel.
[0012] Furthermore, the data acquisition and processing unit calculates the contact voltage based on the voltage difference between the steel structure measuring point and the ground measuring point, and calculates the step voltage based on the voltage difference between adjacent ground measuring points.
[0013] A monitoring method for a dedicated remote monitoring device for induced voltage in steel structure bridges includes the following steps: A. Set at least two steel structure measuring points on the steel structure bridge body and set multiple ground measuring points on the ground around the bridge, with adjacent ground measuring points arranged at radial intervals; B. Without using protective grounding as the zero-point reference and without performing automatic zero-potential determination, establish a contact voltage measurement channel between steel structure measuring points and ground measuring points, as well as a step voltage measurement channel between adjacent ground measuring points; use buried ground electrodes to form ground measuring points, and connect the steel structure measuring points and ground measuring points to the data acquisition and processing unit respectively through double-shielded cables; C. Perform point-to-point differential sampling on each measurement channel; D. Using 1 second as the statistical period, calculate the root mean square value of the effective value for 100 sampling points in each channel within that period, and obtain the second-level effective value for each channel; E. Obtain the contact voltage trend based on the second-level effective value between the steel structure measuring point and the ground measuring point, and obtain the step voltage trend based on the second-level effective value between adjacent ground measuring points; F. Calculate the historical sliding median for each channel and compare the current second-level effective value with the historical sliding median; G. When the current second-level valid value deviates from the historical sliding median value by more than a preset threshold, it is determined as an abnormal event, and the event is marked, cached, and / or uploaded with priority; H. When communication is normal, upload the trend data of each channel to the remote server. When communication is interrupted, write the second-level effective values of each measurement channel to the local cache unit. After communication is restored, re-upload the data that was not uploaded during the interruption according to the timestamp. I. The remote server displays, archives, and performs safety assessments based on contact voltage, step voltage, and abnormal event results.
[0014] Furthermore, after an abnormal event is triggered, the original sampling data within a preset time period before and after the abnormality occurs is saved.
[0015] The beneficial effects of this invention are as follows: This invention enables long-term, stable, and continuous monitoring of the induced voltage difference between the steel structure bridge body and the surrounding ground without relying on automatic zero-potential determination. It adopts a point-to-point differential measurement method, with a clear measurement object and a simple measurement circuit. The strategy of sampling at 100 Hz and outputting the effective value in 1 second results in low power consumption and moderate data volume, making it suitable for long-term solar power supply.
[0016] This invention employs an anomaly event discrimination method based on historical sliding median values to automatically identify induced voltage changes that significantly deviate from the background level; it supports local caching and breakpoint retransmission, making it suitable for remote unattended monitoring in field scenarios along railway lines. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the dedicated equipment for this invention; Figure 2 This is a distribution diagram of the steel structure measuring points in this invention; The components include: 1. First steel structure measuring point; 2. Second steel structure measuring point; 3. Third ground measuring point; 4. Fourth ground measuring point; 5. Fifth ground measuring point; 6. Sixth ground measuring point; 7. Front-end measuring point; 8. Signal access unit; 9. Data acquisition and processing unit; 10. Abnormal event discrimination unit; 11. Local buffer unit; 12. Wireless transmission unit; 13. Remote server; 14. Solar power supply unit; 15. Protective grounding unit. Detailed Implementation
[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 2 As shown, a special device for remote monitoring of induced voltage in steel structure bridges includes: Front-end measuring point 7 is set up on the steel structure bridge and the ground around the piers; The signal access unit 8 is connected to the front-end measuring point 7 and receives the measurement signal from the measuring point. The data acquisition and processing unit 9 is connected to the signal access unit 8, and receives the acquired signals and outputs the monitoring data. The abnormal event discrimination unit 10 is connected to the data acquisition and processing unit 9, receives monitoring data, and discriminates abnormal events; The local cache unit 11 is connected to the abnormal event discrimination unit 10 and receives and caches monitoring data.
[0019] The local cache unit 11 also communicates with the wireless transmission unit 12, and the wireless transmission unit 12 wirelessly transmits the monitoring data cached in the local cache unit 11.
[0020] The output of the wireless transmission unit 12 is connected to the remote server 13, which remotely stores the monitoring data.
[0021] The front-end measuring point 7 includes steel structure measuring points and ground measuring points.
[0022] The steel structure measuring points include a first steel structure measuring point 1 and a second steel structure measuring point 2. The first steel structure measuring point 1 is located in the area of the steel beam at the top of the frame pier, and the second steel structure measuring point 2 is located at the base of the steel structure of the frame pier.
[0023] The ground measuring points include a third ground measuring point 3, a fourth ground measuring point 4, a fifth ground measuring point 5, and a sixth ground measuring point 6, which are arranged along the direction away from the pier.
[0024] The measurement channel is established using a point-to-point differential measurement method for the first steel structure measuring point 1, the second steel structure measuring point 2, the third ground measuring point 3, the fourth ground measuring point 4, the fifth ground measuring point 5, and the sixth ground measuring point 6.
[0025] The measurement channel calculates the contact voltage and step voltage.
[0026] Specifically, the signal access unit 8 includes a shielded transmission module, a channel terminal, and a channel protection module. The shielded transmission module provides transmission shielding, and the channel protection module provides transmission protection.
[0027] Specifically, the data acquisition and processing unit 9 includes an acquisition module, a conversion module, and a feature calculation module.
[0028] Specifically, the abnormal event discrimination unit 10 includes a baseline statistics module, an abnormal comparison module, and a time stamping module.
[0029] Specifically, the local cache unit 11 includes a trend data cache module, an abnormal data cache module, and a retransmission control module.
[0030] Specifically, the remote server 13 includes a data receiving module, a trend display module, and an anomaly alarm module.
[0031] Meanwhile, the remote monitoring equipment also includes a solar power supply unit 14, which supplies power to the above-mentioned units. The solar power supply unit 14 includes a solar panel, a charge and discharge control module, and a battery module.
[0032] Meanwhile, the remote monitoring equipment also includes a protective grounding unit 15, which comprises an SPD lightning protection module, a grounding terminal, and a metal protective enclosure. The protective grounding unit 15 provides grounding protection.
[0033] Specifically, the interval between the third ground measuring point 3, the fourth ground measuring point 4, the fifth ground measuring point 5, and the sixth ground measuring point 6 is 0.5 m.
[0034] The third ground measuring point 3 is 0.5 m from the bottom of the pier, the fourth ground measuring point 4 is 1.0 m from the bottom of the pier, the fifth ground measuring point 5 is 1.5 m from the bottom of the pier, and the sixth ground measuring point 6 is 2.0 m from the bottom of the pier.
[0035] Specifically, ground measuring points 3, 4, 5, and 6 are implemented using buried ground electrodes. These electrodes are galvanized steel rods, buried at the corresponding ground measuring point locations, and connected to the signal access unit via leads.
[0036] Meanwhile, the first steel structure measuring point 1 and the second steel structure measuring point 2 are electrically connected to the steel structure bridge body through welding, bolting or reliable clamping.
[0037] The point-to-point differential measurement method does not acquire the absolute potential of each measuring point, but directly acquires the voltage difference between two measuring points. The measurement circuit is established as follows: the positive input terminal of each acquisition channel is connected to the first measuring point, and the negative input terminal is connected to the second measuring point. The acquisition unit directly outputs the instantaneous voltage difference between the two measuring points.
[0038] Specifically, the measurement channel between the steel structure measuring point and the ground measuring point is used to calculate the contact voltage; the measurement channel between adjacent ground measuring points is used to calculate the step voltage.
[0039] At the same time, measurement channels are set up between steel structure measuring points when needed to compare the potential difference between different steel components.
[0040] Specifically, the first steel structure measuring point 1, together with the third ground measuring point 3, the fourth ground measuring point 4, the fifth ground measuring point 5, and the sixth ground measuring point 6, constitutes a contact voltage measurement channel.
[0041] Specifically, the second steel structure measuring point 2, together with the third ground measuring point 3, the fourth ground measuring point 4, the fifth ground measuring point 5, and the sixth ground measuring point 6, constitutes a contact voltage measurement channel.
[0042] Specifically, the step voltage measurement channels are formed between the third ground measuring point 3 and the fourth ground measuring point 4, between the fourth ground measuring point 4 and the fifth ground measuring point 5, and between the fifth ground measuring point 5 and the sixth ground measuring point 6.
[0043] The aforementioned channels enable the bridge body to monitor contact voltage at different ground locations, as well as step voltage between different ground locations.
[0044] It should be noted that the equipment protective grounding and measurement circuit are separated in this invention. The field grounding stake, equipment box grounding terminal, and SPD bleed terminal are only used for equipment protection, shielding layer bleed current discharge, and surge suppression, and are not used as the zero-point reference for each measurement channel. This invention does not require automatic zero-potential determination; the equipment directly measures the voltage difference using a point-to-point differential method.
[0045] Specifically, the shielded transmission module in signal access unit 8 improves anti-interference capabilities in strong electromagnetic environments. The leads from the steel structure measuring points and ground measuring points to the acquisition host all use single-core double-shielded special cables. The double-shielded structure suppresses interference from the power frequency electromagnetic field of the contact network, train operation, and crosstalk between different channels, improving the signal-to-noise ratio of weak induced voltage measurements.
[0046] Specifically, the channel protection module in signal access unit 8 refers to the installation of surge protectors (SPDs) at the power supply input, battery side, and input of each data acquisition channel. These SPDs are used to discharge lightning strikes, grid surges, or other transient overvoltages in stages. The acquisition host, battery, and communication module are housed in a metal protective enclosure. The enclosure is grounded at a single point via an existing grounding stake to ensure that the shielding layer and SPDs have an effective discharge path.
[0047] Specifically, the solar power supply unit 14 includes a solar panel, a charge / discharge control module, and a battery energy storage module. Under sunlight conditions, the solar panel charges the battery and simultaneously powers the data acquisition host, communication module, and peripheral sensing circuitry; at night or under low-irradiance conditions, the battery continuously supplies power to the entire monitoring equipment.
[0048] The solar power unit is redundantly configured for long-term unattended operation to ensure that the equipment can continue to work even during continuous cloudy and rainy weather. Because the data acquisition method in this invention uses 100 Hz sampling and outputs one valid value per second, the data storage and wireless transmission load are low, resulting in low overall energy consumption and good compatibility with the solar power supply solution.
[0049] Specifically, the data acquisition and processing unit 9 continuously samples each point-to-point differential measurement channel. The sampling frequency is set to 100 Hz, meaning that 100 instantaneous sampling points are collected per second for each channel.
[0050] In trend monitoring mode, the acquisition unit calculates the effective value of 100 sampling points within a statistical period of 1 second, obtains one effective value of the channel within that second, and stores and uploads this effective value as trend monitoring data.
[0051] In other words, this invention does not simply take one raw sampling point per second, but rather performs statistical processing on 100 sampling points within that second to output a more meaningful second-level effective value. This method retains the ability to respond to changes in power frequency induced voltage while significantly reducing the bandwidth usage for remote communication and the pressure on long-term storage.
[0052] For the channel between the steel structure measuring point and the ground measuring point, the second-level effective value is used to characterize the contact voltage change; for the channel between adjacent ground measuring points, the second-level effective value is used to characterize the step voltage change.
[0053] Meanwhile, the server or edge processing unit can further generate contact voltage curves and step voltage curves according to the channel type.
[0054] Specifically, the abnormal event discrimination unit 10 does not introduce an additional complex zero-position calibration algorithm, but adopts an abnormal event discrimination method based on the historical sliding median value.
[0055] For each measurement channel, the edge processing unit continuously saves N consecutive second-level valid values of that channel before the current moment, and uses these N consecutive second-level valid values to form a sliding window. The median value of this sliding window is calculated as the historical sliding median value. When the deviation of the current second-level valid value from the historical sliding median value exceeds a preset threshold, it is determined that an abnormal event has occurred in that channel at the current moment.
[0056] Specifically, the anomaly detection conditions are as follows: The absolute value of the difference between the current valid value and the historical sliding median value is greater than the first threshold. And / or the percentage relative deviation of the current valid value from the historical sliding median value is greater than the second threshold; And / or the above-mentioned abnormal states are maintained for a preset number of statistical periods.
[0057] In one exemplary embodiment, the historical sliding median value is calculated from a sliding window consisting of the previous N second-level effective values of the channel, where N is between 60 and 3600; the window length and threshold can be set according to the on-site background noise level, line load changes, and engineering safety requirements.
[0058] When an abnormal event is triggered, the device will perform at least one or more of the following actions: 1. Add an exception event flag to the current valid second-level value; 2. Write the channel number, timestamp, and abnormal amplitude corresponding to the abnormal event into the local cache; Third, increase the priority of remote uploading of data related to this abnormal event; Fourth, the original sampling data within a preset time period before and after the anomaly occurs will be additionally saved for subsequent analysis.
[0059] Therefore, the events in this invention are not triggered by additional search for zero points or switching measurement references, but are determined based on the statistical deviation of the point-to-point voltage difference sequence.
[0060] Specifically, in order to adapt to the field conditions of unattended operation and fluctuating communication environment along the railway line, the wireless transmission unit 12 and the local cache unit 11 in this invention support breakpoint retransmission.
[0061] Under normal communication conditions, the device uploads the second-level valid values of each channel to the remote server according to a predetermined cycle; when a channel is determined to be an abnormal event, the second-level valid values, event identifiers and corresponding timestamps related to the abnormal event are uploaded first.
[0062] When the device detects a 4G communication interruption, the acquisition host continues to perform local sampling and effective value calculation, and continuously writes the second-level effective values of each channel into the local cache storage area without stopping the acquisition.
[0063] When communication is restored, the device retransmits the data that was not uploaded during the interruption in chronological order according to the timestamp and data segment number recorded in the local cache, thereby ensuring the integrity and continuity of the monitoring sequence in the remote server.
[0064] Preferably, the local cache storage area adopts a circular cache structure; for data segments that are determined to be abnormal events, they can be set as high-priority protection areas to avoid being covered by ordinary trend data.
[0065] A monitoring method for a dedicated remote monitoring device for induced voltage in steel structure bridges includes the following steps: A. Set at least two steel structure measuring points on the steel structure bridge body and set multiple ground measuring points on the ground around the bridge, with adjacent ground measuring points arranged at radial intervals; B. Ground measuring points are formed by embedded ground electrodes, and the steel structure measuring points and ground measuring points are connected to the data acquisition and processing unit 9 by double-shielded cables; C. Perform point-to-point differential sampling on each measurement channel; D. Using 1 second as the statistical period, calculate the root mean square value of the effective value for 100 sampling points in each channel within that period, and obtain the second-level effective value for each channel; E. Obtain the contact voltage trend based on the second-level effective value between the steel structure measuring point and the ground measuring point, and obtain the step voltage trend based on the second-level effective value between adjacent ground measuring points; F. Calculate the historical sliding median for each channel and compare the current second-level effective value with the historical sliding median; G. When the absolute difference between the current second-level valid value and the historical sliding median value is greater than the first threshold, and this state is maintained continuously for M statistical periods, it is determined to be an abnormal event, and the event is marked, cached, and / or uploaded with priority. In this specification, an abnormal event refers to a state in which the absolute deviation of the current second-level effective value of any measurement channel relative to the corresponding historical sliding median value exceeds the first threshold and continues for M consecutive statistical periods. H. When communication is normal, upload the trend data of each channel to the remote server 13. When communication is interrupted, write the data to the local cache unit 11. After communication is restored, perform missing data retransmission according to the timestamp. I. The remote server 13 displays, archives, and performs safety assessments based on contact voltage, step voltage, and abnormal event results.
[0066] This invention enables long-term, stable, and continuous monitoring of the induced voltage difference between the steel structure bridge body and the surrounding ground without relying on automatic zero-potential determination. It adopts a point-to-point differential measurement method, with a clear measurement object and a simple measurement circuit. The strategy of sampling at 100 Hz and outputting the effective value in 1 second results in low power consumption and moderate data volume, making it suitable for long-term solar power supply.
[0067] This invention employs an anomaly event discrimination method based on historical sliding median values to automatically identify induced voltage changes that significantly deviate from the background level; it supports local caching and breakpoint retransmission, making it suitable for remote unattended monitoring in field scenarios along railway lines.
Claims
1. A special device for remote monitoring of induced voltage in steel structure bridges, characterized in that: include: Front-end measuring points (7) are set up on the steel structure bridge and the ground around the piers; The signal access unit (8) is connected to the front-end measuring point (7) and receives the measurement signal from the measuring point; The data acquisition and processing unit (9) is connected to the signal access unit (8) to receive the acquired signals and output the monitoring data; The abnormal event discrimination unit (10) is connected to the data acquisition and processing unit (9), receives monitoring data, and discriminates abnormal events; The local cache unit (11) is connected to the abnormal event discrimination unit (10) to receive and cache monitoring data.
2. The special equipment for remote monitoring of induced voltage in steel structure bridges according to claim 1, characterized in that: The local cache unit (11) also communicates with the wireless transmission unit (12), and the wireless transmission unit (12) wirelessly transmits the monitoring data cached in the local cache unit (11).
3. The special equipment for remote monitoring of induced voltage in steel structure bridges according to claim 2, characterized in that: The output of the wireless transmission unit (12) is connected to a remote server (13), which remotely stores the monitoring data.
4. The special equipment for remote monitoring of induced voltage in steel structure bridges according to claim 1, characterized in that: The front-end measuring points (7) include steel structure measuring points and ground measuring points.
5. A special device for remote monitoring of induced voltage in steel structure bridges according to claim 4, characterized in that: The steel structure measuring points include a first steel structure measuring point (1) and a second steel structure measuring point (2). The first steel structure measuring point (1) is located in the area of the steel beam at the top of the frame pier, and the second steel structure measuring point (2) is located at the base of the steel structure of the frame pier.
6. A special device for remote monitoring of induced voltage in steel structure bridges according to claim 5, characterized in that: The ground measuring points include a third ground measuring point (3), a fourth ground measuring point (4), a fifth ground measuring point (5), and a sixth ground measuring point (6). The third ground measuring point (3), the fourth ground measuring point (4), the fifth ground measuring point (5), and the sixth ground measuring point (6) are arranged in a direction away from the pier.
7. A special device for remote monitoring of induced voltage in steel structure bridges according to claim 6, characterized in that: The first steel structure measuring point (1), the second steel structure measuring point (2), the third ground measuring point (3), the fourth ground measuring point (4), the fifth ground measuring point (5), and the sixth ground measuring point (6) are established using a point-to-point differential measurement method to establish a measurement channel.
8. A special device for remote monitoring of induced voltage in steel structure bridges according to claim 7, characterized in that: The data acquisition and processing unit (9) calculates the contact voltage based on the voltage difference between the steel structure measuring point and the ground measuring point, and calculates the step voltage based on the voltage difference between adjacent ground measuring points.
9. The monitoring method of a special equipment for remote monitoring of induced voltage in steel structure bridges according to claim 1, characterized in that: Includes the following steps: A. Set at least two steel structure measuring points on the steel structure bridge body and set multiple ground measuring points on the ground around the bridge, with adjacent ground measuring points arranged at radial intervals; B. Under the condition that the protective grounding is not used as the zero-point reference and the zero potential is not automatically determined, a contact voltage measurement channel between the steel structure measuring point and the ground measuring point and a step voltage measurement channel between adjacent ground measuring points are established; a buried ground electrode is used to form a ground measuring point, and the steel structure measuring point and the ground measuring point are connected to the data acquisition and processing unit (9) respectively through a double-layer shielded cable. C. Perform point-to-point differential sampling on each measurement channel; D. Using 1 second as the statistical period, calculate the root mean square value of the effective value for 100 sampling points in each channel within that period, and obtain the second-level effective value for each channel; E. Obtain the contact voltage trend based on the second-level effective value between the steel structure measuring point and the ground measuring point, and obtain the step voltage trend based on the second-level effective value between adjacent ground measuring points; F. Calculate the historical sliding median for each channel and compare the current second-level effective value with the historical sliding median; G. When the current second-level valid value deviates from the historical sliding median value by more than a preset threshold, it is determined as an abnormal event, and the event is marked, cached, and / or uploaded with priority; H. When communication is normal, upload the trend data of each channel to the remote server (13). When communication is interrupted, write the second-level effective value of each measurement channel to the local cache unit (11). After communication is restored, re-upload the data that was not uploaded during the interruption according to the timestamp. I. The remote server (13) displays, archives, and performs safety assessments based on contact voltage, step voltage, and abnormal event results.
10. The monitoring method of a special equipment for remote monitoring of induced voltage in steel structure bridges according to claim 9, characterized in that: After an abnormal event is triggered, the original sampling data within a preset time period before and after the abnormality occurs is saved.