Method for preventing channel liquid from corroding power cable and intelligent monitoring system

Abstract

The invention provides a method for preventing channel liquid from corroding a power cable and an intelligent monitoring system, micro pH value sensors are installed on the lower sides of a plurality of different cable supports at the bottommost layer in a power cable laying channel or on the bottom surface of the channel, and an intelligent device with a liquid level sensor at the bottom is installed on the cable support at the uppermost layer of the channel or on the side wall of the channel. The pH value sensor and the liquid level sensor are used for collecting pH values and liquid levels of liquid at different positions in the channel and sending the pH values and the liquid levels to the intelligent device for analysis and processing. And if any one of the pH value or the liquid level value of the liquid reaches a set alarm threshold value, the intelligent device gives an alarm to a rear-end operation and maintenance system. By monitoring the pH value and the liquid level of the liquid in the channel, operation and maintenance personnel are reminded to discharge the liquid which corrodes the cable or submerges the intelligent device out of the channel in time, the cable soaked in the liquid can be well prevented from being corroded, irreversible damage to the cable is avoided, and the operation reliability of the monitoring system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable monitoring equipment, and in particular to a method for preventing channel liquid from corroding a power cable and an intelligent monitoring system. Background Art

[0002] As power users have increasingly stringent requirements for power supply reliability and urbanization construction has continuously improved environmental requirements, power cables, with their advantages of high power supply reliability and little impact on environmental beauty, are increasingly being laid in cable trenches and direct burials instead of overhead transmission lines. Since the cable trench is not a closed space, it is affected by factors such as terrain, construction, and maintenance, and there are gaps and openings at different locations. Therefore, water accumulation is inevitable in the trench, especially during the summer flood season when a large amount of rainwater accumulates or other liquids infiltrate.

[0003] At present, most power cables are directly laid on the wall bracket in multiple layers in the trench, and some are directly laid at the bottom of the trench. Except for the insulation layer of the cable itself, no other protective measures are set. Since the liquid in the trench mostly comes from rainwater, melted ice and snow, especially sewage generated by rain and snow on the road, and the water from different sources will show a certain pH value due to the influence of dissolved impurities in the flow process, it will cause different degrees of corrosion to the cables laid inside after being immersed in the cable trench, thus affecting the insulation, reliability and service life of the cable.

[0004] In the prior art, a Chinese invention patent with announcement number CN109444032B discloses an intelligent monitoring device for power cable corrosion monitoring, including a test box, a first test chamber, a second test chamber and a third test chamber are arranged in the test chamber from left to right in the internal cavity, a first test cable is arranged in the first test chamber, a second test cable is arranged in the second test chamber, a third test cable is arranged in the third test chamber, a test soil is arranged in the first test chamber, and a corrosion solution is arranged in the second test chamber; a cable detection table is arranged at the upper port of the storage cavity; a left vertical support plate is fixedly arranged on the left end surface of the test box, a right vertical support plate is fixedly arranged on the right end surface of the test box, a horizontal guide rail is arranged between the left vertical support plate and the right vertical support plate, and a scanning electron microscope and an infrared spectrum analysis device are arranged on the horizontal guide rail. The above technical scheme has reasonable structural design, simple structure, multiple functions, convenient use, comprehensive cable monitoring, convenient maintenance and wide application range. However, the solution disclosed in CN109444032B is mainly used to monitor the degree of cable corrosion under different conditions in the laboratory. The actual cable laying scenarios are complex and changeable. Laboratory conditions are difficult to cover all real operating environments of cables. In addition, due to differences in materials, different cables have large differences in their corrosion processes even under the same conditions. Therefore, it is difficult to meet the real-time operation monitoring needs of different power cables.

[0005] CN115096730A discloses an online monitoring device for cable corrosion in a cable tunnel, which relates to the field of cable monitoring, and in particular to an online monitoring device for cable corrosion in a cable tunnel. The online monitoring device includes a lifting unit and a monitoring unit, etc.; the lifting unit is connected to a monitoring unit for monitoring the degree of cable corrosion. In the present invention, a detection component is arranged on a trolley moving along a track, so as to realize regular monitoring of the corrosion conditions of different positions of the cable, and the corrosion speed of the cable is judged by respectively detecting the humidity and hardness of the local position of the cable and comparing the corrosion conditions at different times, and by comparing the corrosion conditions of multiple parts of two adjacent cables at the same position, the area where the cable corrosion speed is abnormal is found. However, the scheme disclosed in CN115096730A is mainly used for regular monitoring of the corrosion conditions of different positions of the cable. Although the area where the cable corrosion speed is abnormal can be found by comparing the laying conditions of multiple parts of the cable, it is not possible to prevent the cable corrosion, nor is it possible to monitor in real time whether the actual operating environment of the power cable is corrosive. Since power cable installation is difficult and failures are often permanent, this solution has limitations in preventing power cable corrosion.

[0006] In summary, in view of the rapid growth in the number of power cable applications, the high cost of laying, replacement and construction, and the difficulty in fault finding, how to conduct real-time monitoring of the environment in which power cables that have been immersed in liquids for a long time are located, analyze and warn of the corrosive liquids in the power cables, and enable the operation and maintenance personnel to discharge the corrosive liquids out of the trench in time, is of great significance to reducing the corrosion of power cables, ensuring their reliable operation and extending their service life. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method and system which is easy to install and maintain, is not affected by the cable material, has a wide range of applications, can monitor the pH value of the liquid soaking the power cable in real time, and is used to prevent the channel liquid from corroding the power cable.

[0008] To achieve the above object, the present invention provides a method for preventing channel liquid from corroding a power cable, comprising the following steps: 1) Collect the pH value of the liquid at different positions at the bottom of the power cable trench and the liquid level at the top position, and analyze and process the collected values; 2) If any of the pH value or liquid level of the collected liquid reaches the set alarm threshold, an alarm will be sent to the back-end operation and maintenance system or other terminals to remind the operation and maintenance personnel to deal with the liquid in the channel in a timely manner.

[0009] Furthermore, since the cable trenches are mostly narrow and the dimensions of the installed equipment are limited, a miniature pH sensor and a liquid level sensor are installed in the trench, both of which are resistant to liquid corrosion and immersion.

[0010] Furthermore, in order to ensure the reliability of communication and transmission of collected information under liquid immersion, wired communication is used for information transmission inside the channel.

[0011] Furthermore, in order to improve the processing efficiency of the information collected in the channel and the reliability of sending alarm information to the back-end operation and maintenance system, the collected liquid pH value and liquid level value are gathered in the channel to the same dedicated device, which centrally analyzes and processes the information and determines whether to issue an alarm.

[0012] Furthermore, the conditions for the special device to issue an alarm are: when the measurement value of any pH sensor is greater than the set alarm acidity value and less than the set alarm alkalinity value, and the measurement value of the liquid level sensor is less than the set maximum liquid level alarm value, the special device does not issue an alarm message; otherwise, the special device issues an alarm message to the outside.

[0013] The present invention also provides an intelligent monitoring system for preventing channel liquid from corroding power cables, comprising an intelligent device, a pH sensor, and a liquid level sensor. The intelligent device includes an indicator light, a power switch, a wire entry hole, etc. on the outside, and includes an operating circuit board, a rechargeable battery, a USB interface, a terminal block, etc. on the inside; the intelligent device is connected to the pH sensor and the liquid level sensor respectively through a bus to collect the pH value and liquid level of the liquid at different positions in the channel; the operating circuit board is surface-mounted with an indicator light, a power switch, a USB interface, a 4G communication module, an Arduino processor and other components.

[0014] Furthermore, the protection levels of the intelligent device, pH sensor and liquid level sensor are not lower than IP68.

[0015] Furthermore, the pH sensor is installed on the lower side of a plurality of cable supports at the bottom layer in the cable trench or on the bottom surface of the trench.

[0016] Furthermore, the liquid level sensor is installed at the bottom of the intelligent device, and is installed together with the intelligent device on the upper part of the uppermost cable support in the channel or on the top side wall of the channel.

[0017] Furthermore, the back-end operation and maintenance system or other terminals can send a call message to the monitoring system at any time to obtain the pH value, liquid level and device operation status of the liquid in the channel.

[0018] Furthermore, the rechargeable battery is an explosion-proof lithium battery with a voltage lower than the safety voltage, and is connected to the smart device in a plug-in manner.

[0019] Furthermore, the 4G communication module, USB interface, pH sensor, liquid level sensor, rechargeable battery, etc. are connected to the Arduino processor.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has a simple structure and is easy to install and operate. By monitoring the pH value of the liquid in the channel, the operation and maintenance personnel can be reminded to discharge the liquid that causes corrosion to the cable out of the channel in time to avoid irreversible damage to the cable, thereby playing a good preventive role in the corrosion of the power cable; the pH sensor installed in the system collects the pH value of the liquid in the channel, and can prevent corrosion of all cables soaked in the liquid, thereby overcoming the shortcomings of the prior art; installing a liquid level sensor in the channel can prevent the liquid level in the channel from flooding the entire monitoring system, which affects the reliability of the system, thereby ensuring the reliable operation of the system; using 4G wireless communication technology to transmit information, the operation and maintenance personnel can remotely obtain on-site information in real time, timely grasp the on-site channel conditions, and improve the efficiency of on-site problem handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the installation of the intelligent monitoring system of the present invention; Figure 2 It is a schematic diagram of installing the liquid level sensor of the present invention; Figure 3 It is a flow chart of channel liquid monitoring of the present invention; Figure 4 is a schematic diagram of the appearance of the smart device of the present invention; Figure 5 is a schematic diagram of the internal structure of the intelligent device of the present invention; Figure 6 It is a schematic diagram of the internal modules and external connections of the intelligent device of the present invention.

[0022] Markings in the figure are: 100-intelligent device, 200-pH value sensor, 300-bus; 400-liquid level sensor; 1-channel side wall, 2-cable bracket, 3-cable, 4-channel bottom, 5-mounting bracket, 6-mounting bracket, 7-operating light display window, 8-battery power indicator light display window, 9-power switch rubber cover, 10-operating circuit board, 101-USB interface, 102-battery power indicator light, 103-operating light, 104-4G communication module, 105-power switch, 106-Arduino processor, 11-rechargeable battery, 12-terminal block. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings. The accompanying drawings are only used for exemplary descriptions, and only represent schematic diagrams rather than physical drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; the orientation or position relationship shown in the accompanying drawings is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation or be installed in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figure 1 , Figure 2 As shown, the present invention discloses an intelligent monitoring system for preventing channel liquid from corroding power cables, which is mainly composed of an intelligent device 100, a pH sensor 200, and a liquid level sensor 400; the intelligent device 100 is interconnected with multiple pH sensors 200 through a bus 300 to supply power and communicate with the pH sensors 200; the intelligent device 100 is interconnected with the liquid level sensor 400 installed at the bottom through a wire to supply power and communicate with the liquid level sensor 400.

[0025] An embodiment of a method for preventing channel liquid from corroding a power cable disclosed in the present invention: A method for preventing channel liquid from corroding a power cable comprises the following steps: Figure 3 As shown: 1) At the top of the power cable trench n The intelligent device 100 is installed on the upper cable support or the upper channel side wall, and 1~ n pH sensor 200; 2) The acidic and alkaline pH value alarm thresholds of the liquid in the channel are set by the intelligent device 100 as follows: x 。 , y 。 , the liquid level alarm threshold is z 。 ; 3) The smart device 100 receives the pH value of the liquid collected by the pH sensor 200 x i (i=1,2,3,…, n ) and the liquid level value z collected by the liquid level sensor 400 for analysis and processing. x 。 ≤ x i ≤ y 。 and z ≤ z。 , the smart device 100 does not send an alarm message to the back-end operation and maintenance system. On the contrary, the smart device 100 uses the 4G communication network to send a pH value or liquid level over-limit alarm to the back-end operation and maintenance system to remind the operation and maintenance personnel to deal with the liquid in the channel in time.

[0026] Specifically, the protection level of the smart device 100, the pH sensor 200, and the liquid level sensor 300 is not less than IP68, and the surface in contact with the liquid has corrosion resistance; the pH sensor 200 adopts a micro sensor; the installation height of the liquid level sensor 400 is greater than n The height of the upper surface of the cables laid on the first-layer cable support.

[0027] It should be noted that the pH sensor 200 installed on the bottom of the channel described in the present application is used in the scenario where the cable is laid on the bottom of the channel; the pH sensor 200 and the liquid level sensor 300 are both commercially available products, and they only need to be able to realize the functions described in the present application, so no specific limitations are made here.

[0028] An embodiment of an intelligent device 100 in an intelligent monitoring system for preventing channel liquid from corroding power cables disclosed in the present invention: like Figures 4 to 6 As shown, in an intelligent monitoring system for preventing channel liquid from corroding power cables, the intelligent device 100 includes a bottom mounting bracket 5, a back mounting bracket 6, an operation light display window 7, a battery power indicator light display window 8, a power switch 9, and a side wire entry hole, etc., and includes an operation circuit board 10, a rechargeable battery 11, a terminal block 12, etc. inside; the mounting bracket 5 and the mounting bracket 6 are connected to the intelligent device 100 by welding, and different installation methods can be selected according to the scene.

[0029] It should be noted that the protection level of the smart device 100 described in this application can be achieved through various implementation methods using existing technologies. It only needs to be able to achieve the functions described in this application, so no specific limitation is made here.

[0030] Among them, the operating circuit board 10 is surface-mounted with components such as a USB interface 101, a battery power indicator light 102, an operating light 103, a 4G communication module 104, and an Arduino processor 105; the operating circuit board 10 is connected to a rechargeable battery 11 and an external sensor through a terminal block 12.

[0031] Specifically, the rechargeable battery 11 supplies power to various electrical components of the operating circuit board 10 and to external sensors via the operating circuit board 10; the pH sensor 200 and the liquid level sensor 400 transmit the collected information such as the pH value and liquid level of the liquid in the channel to the Arduino processor 105 through the bus for analysis and processing, and the Arduino processor 105 transmits the pH value over-limit alarm information and the liquid level over-limit alarm information to the remote back-end operation and maintenance system through the 4G communication module 104 according to the processing result, so as to remind the operation and maintenance personnel to deal with the liquid in the channel in time to avoid corrosion of the power cables laid in the channel or flooding of the smart device 100; the back-end operation and maintenance system can send a call message to the smart device 100 at any time through the 4G communication network to obtain the pH value, liquid level and device operation status and other information collected in the channel; the operation and maintenance personnel can set the time interval through the smart device 100 t , send the monitoring system operation status information to the back-end operation and maintenance system to ensure the normal operation of the system.

[0032] It should be noted that the 4G communication module 104, Arduino processor 105, and pluggable rechargeable lithium battery 11 described in this application are all commercially available products, and no other special requirements are made in this application. It is only necessary that they can realize the functions described in this application, so no specific restrictions are made here.

[0033] Specific implementation methods are given above, but the present invention is not limited to the described implementation methods. The basic idea of ​​the present invention lies in the above basic scheme. For ordinary technicians in this field, it does not take creative work to design various deformed models, formulas, and parameters according to the teachings of the present invention. Changes, modifications, substitutions, and variations of the implementation methods without departing from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A method for preventing channel liquid from corroding a power cable, characterized in that: The method comprises the following steps: 1) Collect the pH value of the liquid at different positions at the bottom of the power cable trench and the liquid level at the top position, and analyze and process the collected values; 2) If any of the pH value or liquid level of the collected liquid reaches the set alarm threshold, an alarm will be sent to the back-end operation and maintenance system or other terminals to remind the operation and maintenance personnel to deal with the liquid in the channel in a timely manner.

2. The method for preventing channel liquid from corroding a power cable according to claim 1, characterized in that: The conditions for issuing an alarm are: when the measurement value of any pH sensor is greater than the set alarm acidity value and less than the set alarm alkalinity value, and the measurement value of the liquid level sensor is less than the set maximum liquid level alarm value, the special device does not issue an alarm message; otherwise, the special device issues an alarm message to the outside.

3. The method for preventing channel liquid from corroding a power cable according to claim 1, characterized in that: The collected liquid pH value and liquid level value are gathered in the channel to the same dedicated device, which centrally analyzes and processes them and determines whether to issue an alarm.

4. The method for preventing channel liquid from corroding a power cable according to claim 1, characterized in that: Miniature pH sensors are installed on the lower side of multiple different cable brackets at the bottom layer in the trench or on the bottom surface of the trench.

5. An intelligent monitoring system for preventing channel liquid from corroding power cables, characterized in that: The invention comprises an intelligent device (100), a pH value sensor (200), a bus (300), and a liquid level sensor (400), characterized in that the intelligent device (100) is installed on the top channel side wall (1) or on the topmost cable support (2) in the power cable channel; the intelligent device (100) is interconnected with a plurality of pH value sensors 200 via the bus 300 to supply power and communicate with the pH value sensors 200; the intelligent device 100 is interconnected with the liquid level sensor 400 installed at the bottom via a wire to supply power and communicate with the liquid level sensor 400; the intelligent device (100) is provided with an operating light display window (7), a battery A power indicator light display window (8), a power switch rubber cover (9), a mounting bracket (5) welded to the bottom, a mounting bracket (6) welded to the back, a waterproof wire entry hole arranged on the side, and an operating circuit board (10), a rechargeable battery (11), and a wiring terminal block (12) installed inside; components such as a USB interface (101), a battery power indicator light (102), an operating light (103), a 4G communication module (104), a power switch (105), and an Arduino processor (106) are installed on the surface of the operating circuit board (10); and the operating circuit board (10) is connected to the rechargeable battery (11) and an external sensor via the wiring terminal block (12).

6. The intelligent monitoring system for preventing channel liquid from corroding power cables according to claim 5, characterized in that: The protection level of the intelligent device (100), pH value sensor (200), and liquid level sensor (400) is not less than IP68.

7. The intelligent monitoring system for preventing channel liquid from corroding power cables according to claim 5, characterized in that: The intelligent device (100), pH value sensor (200), and liquid level sensor (400) are all capable of resisting liquid corrosion and immersion.

8. The intelligent monitoring system for preventing channel liquid from corroding power cables according to claim 5, characterized in that: The liquid level sensor (400) is installed at the bottom of the intelligent device by means of screw cards, and the installation height is greater than the height of the upper surface of the cable laid by the uppermost cable bracket.

9. The intelligent monitoring system for preventing channel liquid from corroding power cables according to claim 5, characterized in that: The rechargeable battery (11) is an explosion-proof lithium battery with a voltage lower than the safety voltage, and is connected to the intelligent device (100) in a plug-in manner.

10. The intelligent monitoring system for preventing channel liquid from corroding power cables according to claim 5, characterized in that: The USB interface (101), the 4G communication module (104), the power switch (105), the pH value sensor (200), and the liquid level sensor (400) are connected to the Arduino processor (106).

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