A monitoring device for measuring ground potential gradient and stray current direction

Abstract

The utility model discloses a monitoring device for measuring ground potential gradient and stray current direction, the monitoring device comprises: a data acquisition module, including a voltage sensor, a cable and a plurality of long-acting copper sulfate reference electrodes, the plurality of long-acting copper sulfate reference electrodes are arranged near the test point, the voltage sensor is connected to the long-acting copper sulfate reference electrodes through a cable; the input end of the data processing module is connected to the voltage sensor, the output end is connected to the host computer, and the host computer is connected to the cloud server through wireless communication. The monitoring device can be installed outdoors to realize continuous monitoring of the ground surface potential gradient and the direction of stray current.

Description

Technical Field

[0001] The utility model relates to the field of stray currents generated by urban rail transit, in particular to a monitoring device for measuring ground potential gradient and stray current direction. Background Art

[0002] With the development of urban rail transit and the increase in the operating life of subway lines, the insulation performance between the rails and the roadbed will decrease, causing part of the rail current to leak to the ground through the insulating pads and concrete roadbed to form stray current. Stray current will cause electrochemical corrosion to the tunnel steel structure and buried metal pipes. Long-term DC corrosion will cause the steel structure to break and the buried metal pipes to be perforated, posing serious safety hazards. At the same time, stray current will also interfere with underground communication lines and equipment, which will seriously affect normal production and life.

[0003] At present, the evaluation method for stray currents generated by existing lines of urban rail transit generally adopts the on-site measurement method. The traditional stray current detection method mainly relies on manual regular detection. This method has problems such as waste of human resources, low monitoring efficiency and limited monitoring range. The monitoring device proposed in this patent can improve the efficiency of data collection related to ground potential gradient and stray current direction, and use the data uploaded to the cloud platform to further analyze the stray current, so as to evaluate the size of the stray current, improve the level of subway safety operation, and provide auxiliary decision-making for operators. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a monitoring device for measuring ground potential gradient and stray current direction, to monitor the magnitude and direction of stray current near rail transit lines or buried metal pipelines.

[0005] The monitoring device includes:

[0006] A data acquisition module, comprising a voltage sensor, a cable and a plurality of long-acting copper sulfate reference electrodes, wherein the plurality of long-acting copper sulfate reference electrodes are arranged near a point to be measured, and the voltage sensor is connected to the long-acting copper sulfate reference electrodes via a cable;

[0007] The input end of the data processing module is connected to the voltage sensor, and the output end is connected to the host computer, and the host computer is connected to the cloud server through wireless communication.

[0008] In one embodiment, the monitoring device further comprises a power module, a data storage module and a timing module, wherein the power module, the timing module and the data storage module are respectively connected to the host computer, and the host computer further comprises a wireless communication module.

[0009] In one embodiment, the data processing module, voltage sensor, power supply module, data storage module, timing module, and host computer are integrated in a sealed box.

[0010] In one embodiment, the cable and the long-acting copper sulfate reference electrode are located outside the sealed box, and the cable is connected to the voltage sensor in the sealed box.

[0011] In one embodiment, the data processing module is an ADC digital-to-analog converter.

[0012] In one embodiment, the host computer uploads data to the cloud server via a wireless communication module.

[0013] In one embodiment, the data storage module includes an SDRAM memory and a USB interface, and the USB interface is connected to the SDRAM memory.

[0014] In one embodiment, the timing module is a SIM900A module, which is synchronized via a 4G network or GPS or Beidou.

[0015] In general, the above technical solution conceived by the utility model has the following beneficial effects compared with the prior art:

[0016] The monitoring device of the present application has a data acquisition module composed of cables, multiple long-acting copper sulfate reference electrodes and sensors, a data processing module and a host computer, and performs synchronous timing through a mobile network. The data is uploaded to a cloud server through the host computer. It can be installed outdoors to achieve continuous monitoring of the surface potential gradient and stray current direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a monitoring device according to an embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the specific structure of the monitoring device of an embodiment of the utility model.

[0019] Figure 3 It is a schematic diagram of a data acquisition module according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1As shown, the present application discloses a monitoring device for measuring ground potential gradient and stray current direction, the monitoring device comprising:

[0022] A data acquisition module, comprising a voltage sensor, a cable and a plurality of long-acting copper sulfate reference electrodes, wherein the plurality of long-acting copper sulfate reference electrodes are arranged near a point to be measured, and the voltage sensor is connected to the long-acting copper sulfate reference electrodes via a cable;

[0023] The input end of the data processing module is connected to the voltage sensor, and the output end is connected to the host computer, and the host computer is connected to the cloud server through wireless communication.

[0024] The monitoring device also has a power module, a data storage module and a timing module. The power module and the data storage module are respectively connected to the host computer, and the host computer also has a wireless communication module.

[0025] The data processing module, voltage sensor, power supply module, timing module, data storage module and host computer are integrated in a sealed box.

[0026] The wireless communication module can be 4G / CAT1, WIFI, 100M ETHERNET, etc. The data processing module exchanges data with the cloud server through the host computer in the form of 4G / CAT1, WIFI, 100M ETHERNET, etc.

[0027] In one embodiment of the present application, Figure 3 As shown, the cable and the long-acting copper sulfate reference electrode are located outside the closed box, and the cable is connected to the voltage sensor in the closed box. In the signal acquisition stage, the monitoring device is set up along the rail transit line, especially in the area where it intersects with, is parallel to, and is close to oil and gas pipelines. Some points to be detected are selected in the above area, and each long-acting copper sulfate reference electrode is placed at the point to be detected in the above area, and is connected to each long-acting copper sulfate reference electrode through a cable.

[0028] In one embodiment of the present application, the stray electrical signal on the long-acting copper sulfate reference electrode is transmitted to the voltage sensor through the ground potential detection cable, and the voltage sensor transmits the stray electrical signal to the data processing module. The data processing module obtains a processed signal after scaling, filtering, removing common-mode interference and isolating the stray electrical signal, and then performs high-speed sampling on the processed signal (the default sampling frequency is 12.8kHz, which can be set).

[0029] In one embodiment of the present application, the data processing module exchanges data with the cloud server through the host computer via 4G / CAT1, WIFI, 100METHERNET, etc., takes the average, maximum, and minimum values ​​of all sampled values ​​of 0.5s (the upload cycle can be set), and converts them into physical values ​​through the ratio and offset. The data is uploaded to the cloud server via the MQTT protocol.

[0030] In one embodiment of the present application, the power module of the present application supports wide power input and can accept 220V AC or DC power. The host computer of the present application has the MQTT data transparent transmission function, which can realize data transmission.

[0031] In one embodiment of the present application, the monitoring device supports AT functions, including reset, channel parameter configuration, calibration, pause acquisition, and network update.

[0032] In one embodiment of the present application, the voltage sensor of the present application can perform eight-channel differential voltage acquisition and provide multi-channel data acquisition capability. The cable of the present application has a high input impedance (greater than or equal to 1MΩ), which helps to improve accuracy and stability. The data processing module of the present application supports JSON data packets, which is helpful for data processing and transmission.

[0033] In one embodiment of the present application, the monitoring module can be adapted to an external current sensor (±15V DC, 20mA), thereby expanding the application range of the sensor.

[0034] In one embodiment of the present application, the monitoring module can drive an external relay to realize a remote control function. The monitoring module has a data caching function and can store data in the device. The monitoring module has a timing module, which is a SIM900A module, and is synchronized through a 4G network or GPS or Beidou. It supports GPS or Beidou positioning functions, provides location information, and ensures the accuracy and synchronization of data. The power supply module, transmission module, acquisition module and high-precision voltage sensor in the device are integrated in a closed small box, which can be installed outdoors for a long time to monitor the size and direction of stray current in real time.

[0035] In one embodiment of the present application, the data processing module is an ADC digital-to-analog converter.

[0036] In one embodiment of the present application, the data storage module includes an SDRAM memory and a USB interface, and the USB interface is connected to the SDRAM memory.

[0037] In one embodiment of the present application, the timing module is a SIM900A module, and time is synchronized through a 4G network or GPS or Beidou.

[0038] In a specific application scenario, the monitoring device of the present application is installed along the rail transit line, and the average surface potential is uploaded to the cloud server every 0.5 seconds. The cloud server can perform feature statistics on the surface potential gradient monitoring data along the line, calculate the surface potential gradient and the direction of stray current, and evaluate the DC interference. Based on the surface potential gradient monitoring data and the continuous rail potential monitoring data and the buried metal structure monitoring data, a return system power supply simulation model is established for the monitored line to simulate the rail potential characteristics under different departure intervals. The knowledge and data-driven method is used to diagnose whether there are defects in the rail insulation and locate the defective section.

[0039] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment 0 of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A monitoring device for measuring ground potential gradient and stray current direction, characterized in that: The monitoring device includes: A data acquisition module, comprising a voltage sensor, a cable and a plurality of long-acting copper sulfate reference electrodes, wherein the plurality of long-acting copper sulfate reference electrodes are arranged near a point to be measured, and the voltage sensor is connected to the long-acting copper sulfate reference electrodes via a cable; The input end of the data processing module is connected to the voltage sensor, and the output end is connected to the host computer, and the host computer is connected to the cloud server through wireless communication.

2. A monitoring device for measuring ground potential gradient and stray current direction according to claim 1, characterized in that: The monitoring device also has a power module, a data storage module and a timing module, and the power module, the timing module and the data storage module are respectively connected to the host computer, and the host computer also has a wireless communication module.

3. A monitoring device for measuring ground potential gradient and stray current direction according to claim 1, characterized in that: The data processing module, voltage sensor, power supply module, data storage module, timing module and host computer are integrated in a sealed box.

4. A monitoring device for measuring ground potential gradient and stray current direction as claimed in claim 3, characterized in that: The cable and the long-acting copper sulfate reference electrode are located outside the sealed box, and the cable is connected to the voltage sensor in the sealed box.

5. A monitoring device for measuring ground potential gradient and stray current direction as claimed in claim 1 or 3, characterized in that: The data processing module is an ADC digital-to-analog converter.

6. A monitoring device for measuring ground potential gradient and stray current direction as claimed in claim 2, characterized in that: The host computer uploads data to the cloud server via the wireless communication module.

7. A monitoring device for measuring ground potential gradient and stray current direction as claimed in claim 2, characterized in that: The data storage module comprises an SDRAM memory and a USB interface, and the USB interface is connected to the SDRAM memory.

8. A monitoring device for measuring ground potential gradient and stray current direction as claimed in claim 2, characterized in that: The timing module is a SIM900A module, which is synchronized via a 4G network, GPS or Beidou.

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