CN116718322A - Sensing cable and device for pipeline leakage monitoring - Google Patents
Sensing cable and device for pipeline leakage monitoring Download PDFInfo
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- CN116718322A CN116718322A CN202310610049.8A CN202310610049A CN116718322A CN 116718322 A CN116718322 A CN 116718322A CN 202310610049 A CN202310610049 A CN 202310610049A CN 116718322 A CN116718322 A CN 116718322A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 49
- 239000002689 soil Substances 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 28
- 239000000523 sample Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 20
- 239000011810 insulating material Substances 0.000 claims description 15
- 239000004020 conductor Substances 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 238000010618 wire wrap Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000003570 air Substances 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
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- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000013307 optical fiber Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 239000000835 fiber Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/182—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Abstract
The present invention provides a sensing cable and device for pipe leak monitoring, the system comprising: the monitoring system comprises a sensing cable for monitoring pipeline leakage, a tester connected with a connector of the sensing cable and monitoring terminal equipment connected with the tester; the tester transmits a film impact electromagnetic signal to the sensing cable, and acquires sensing cable ID information and dielectric constants of soil surrounding a pipeline based on a reflected signal received from the sensing cable; and the monitored terminal equipment analyzes and acquires the leakage position of the pipeline based on the dielectric constant acquired by the tester. According to the invention, the sensing cable is arranged beside the pipeline, so that the pipeline can be subjected to leakage detection and positioning by acquiring the dielectric constant of soil near the pipeline.
Description
Technical Field
The invention relates to the field of pipeline leakage, in particular to a sensing cable and a sensing device for pipeline leakage monitoring.
Background
The pollution discharge and percolate pipelines bear a large amount of pollutants, once the pipelines are damaged, the pollutants can inevitably infiltrate into the ground to pollute the surrounding water and soil environment, and serious environmental disasters can be caused, so that the pollution discharge and percolate pipelines become serious environmental protection accidents. Long-term water erosion can also cause ground collapse accidents and casualties.
Due to the influence of different geological environments in various areas and the complexity of pipeline conveying media, corrosion phenomena are easy to occur in the pipeline, damage is caused, and pipeline leakage is caused. The leakage of the pipeline brings serious economic loss and causes serious environmental pollution. If the state of the pipeline can be monitored in real time, when the pipeline is damaged to generate leakage, the generation of the leakage is detected in time, and a leakage point is found, so that the damaged pipeline can be repaired or even replaced, and the water resource waste, pollution or safety problem caused by the leakage of the pipeline is reduced.
In leak detection and localization of a pipeline, the following three requirements should be met:
(1) Timeliness. If a leak occurs in the water supply line, the leak point must be quickly responded to and determined so that the loss can be effectively reduced.
(2) Accuracy. After the leakage of the pipeline is determined, the collected data can be rapidly analyzed, and the position of the leakage point of the water supply pipeline can be accurately given.
(3) And (5) economy. The pipeline leakage detection and positioning system can save the cost as much as possible on the basis of meeting the two characteristics.
The method for detecting leakage in the pipeline is developed at the end of the 80 th century, and based on the technologies of magnetic flux, ultrasound, vortex, video recording and the like, a detecting instrument (ball) is detected along the pipeline, and data is collected by a noise method or a magnetic leakage method, and whether the pipeline leaks or not is analyzed and judged. The method has the advantages of accurate detection and higher precision, and is suitable for pipelines with larger pipe diameters, elbows and less communication; but the detection can only be performed intermittently, the blockage and the shutdown accidents are easy to occur, and the manufacturing cost is high. The technology of detecting leakage outside the pipe generally utilizes vibration signals, temperature signals and humidity around a leakage port or pressure gradient curves around the pipe to determine the state of the pipe and the position of the leakage point, and only the detection device is required to be arranged on the outer wall of the pipe or around the pipe to acquire the information, so that the size of the caliber of the pipe does not influence the detection result. The pipeline external leakage detection method comprises an acoustic wave detection method, a real-time model method, a pressure gradient method, an SCADA system, a stress wave detection method, a negative pressure wave method, a mass or volume balance method, an optical fiber sensing method and the like. Among them, the most widely used are a negative pressure wave method, a sonic correlation method, a mass/flow balance method, and an optical fiber sensing method. These methods are limited in practical use due to environmental conditions, and are ineffective for non-pressure pipes, negative pressure waves and flow balancing, while fiber optic sensing methods determine leaks based on changes in temperature caused by leaks, and are ineffective for conditions where fluid and outside-pipe temperatures are consistent.
Therefore, how to detect and locate the leakage of the pipeline is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-described shortcomings of the prior art, it is an object of the present invention to provide a sensing cable and apparatus for pipe leak monitoring for leak detection and location of pipes.
To achieve the above and other related objects, the present invention provides a sensing cable for pipe leakage monitoring, comprising: a metal probe, a sensing cable, a connector and an identification chip; the metal probe is used for being inserted into soil near the pipeline; one end of the sensing cable is connected with the probe, the other end of the sensing cable is connected with the connector, and the sensing cable comprises coaxial cables and wires which are parallel to each other and insulated from each other; the identification chip is connected with the connector and used for storing and identifying the ID of the monitoring sensing cable; the connector is used for being connected with the tester, and transmitting the received signal data of the sensing cable to the tester so that the tester can acquire the dielectric constant of soil around the pipeline to monitor pipeline leakage.
In one embodiment of the present invention, the coaxial cable includes: an inner metal conductor, a first insulating material layer coated outside the inner conductor, an outer metal conductor arranged outside the first insulating material layer, an outer sheath coated outside the outer metal conductor and a second insulating material layer arranged outside the outer sheath; the electric wire comprises a metal wire and a third insulating material layer coated outside the metal wire.
In an embodiment of the present invention, the coaxial cable and the part of the area of the electric wire are covered with a copper wire shielding layer.
To achieve the above and other related objects, the present invention provides an apparatus for pipe leakage monitoring, comprising a sensing cable for pipe leakage monitoring as described above, a tester connected to a connector of the sensing cable, and a monitoring terminal device connected to the tester; the tester transmits a film impact electromagnetic signal to the sensing cable, and acquires sensing cable ID information and dielectric constants of soil surrounding a pipeline based on a reflected signal received from the sensing cable; and the monitored terminal equipment analyzes and acquires the leakage position of the pipeline based on the dielectric constant acquired by the tester.
In an embodiment of the present invention, the tester is a TDR tester, and the tester includes a signal generator, a signal collector, and data analysis software.
In an embodiment of the present invention, the tester uses a travel time method to obtain the propagation speed of the film impact electromagnetic signal and the dielectric constant of the soil surrounding the pipeline.
In an embodiment of the present invention, the dielectric constant is calculated by:
wherein K is a And L is the length of a metal probe inserted into the soil body, c is the end point of the reflection-corresponding pulse width at the juncture of the air segment and the medium surface, and deltat is the time difference between the starting point of the reflection-corresponding pulse width at the juncture of the air segment and the medium surface and the reflection point at the tail end of the probe.
In an embodiment of the present invention, the monitored terminal device obtains a current TDR graph of the sensing cable based on the dielectric constant obtained by the tester, and compares the current TDR graph of the sensing cable with a historical TDR graph of the sensing cable to determine a pipeline leakage position.
In one embodiment of the invention, the sensing cable is laid along the base groove of the pipeline and is parallel to the pipeline; the connector of the sensing cable is connected to the tubing well interface of the tubing.
In one embodiment of the invention, the sensing cable portion of the tubing well to the underground is shielded and insulated by copper wire wrapping.
As described above, the sensing cable and device for pipe leakage monitoring of the present invention have the following advantageous effects:
according to the invention, the sensing cable is arranged beside the pipeline, so that the pipeline can be subjected to leakage detection and positioning by acquiring the dielectric constant of soil near the pipeline.
Drawings
FIG. 1 is a schematic diagram of an apparatus for pipe leak monitoring in accordance with one embodiment of the present invention.
FIG. 2 is a schematic diagram of a sensor cable for monitoring pipe leakage according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a sensor cable according to an embodiment of the invention.
Fig. 4 is a cross-sectional view of a sensor cable according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an application of the sensing cable according to an embodiment of the invention.
FIG. 6 is a diagram showing a test waveform of a time-of-flight method according to an embodiment of the present invention.
Fig. 7 shows a current TDR profile of a sensor cable in an apparatus for pipe leak monitoring in an embodiment of the present invention.
Description of element reference numerals
100. Sensing cable 100
110. Sensing cable 110
111. Coaxial cable 111
111a inner metal conductor
111b first layer of insulating material
111c outer metal conductor
111d outer sheath
111e second insulating material layer
112. Electric wire
112a wire
112b third insulating material layer
113. Copper wire
120. Metal probe
130. Connector with a plurality of connectors
140. Identification chip
101. Pipeline well
102. Pipeline
200. Tester
300. Monitoring terminal equipment
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
The embodiment provides a sensing cable and a sensing device for monitoring leakage of a pipeline, which are used for detecting and positioning the leakage of the pipeline.
The principles and embodiments of the sensing cable and apparatus for pipe leak monitoring of the present invention will be described in detail below, so that those skilled in the art will understand the inventive concept without undue burden.
FIG. 1 is a schematic diagram of an apparatus for pipe leak monitoring in accordance with one embodiment of the present invention. As shown in fig. 1, the present embodiment provides an apparatus for monitoring leakage of a pipe, which includes a sensor cable 100 for monitoring leakage of a pipe 102, a tester 200 connected to a connector 130 of the sensor cable 100, and a monitoring terminal device 300 connected to the tester 200.
The device for pipe leakage monitoring of the present embodiment is described in detail below.
Fig. 2 is a schematic diagram of the structure of the sensor cable 100 for monitoring leakage of the pipe 102 in the present embodiment. As shown in fig. 2, in the present embodiment, the sensing cable 100 includes: a metal probe 120, a sensing cable 110, a connector 130, and an identification chip 140. The metal probe 120 is used for being inserted into soil near the pipeline 102; one end of the sensing cable 110 is connected to the probe, the other end is connected to the connector 130, and the identification chip 140 is connected to the connector 130, for storing and identifying the ID of the monitoring sensing cable 110; the connector 130 is used for connecting with the tester 200, and transmitting the received signal data of the sensing cable 110 to the tester 200, so that the tester 200 can obtain the dielectric constant of the soil around the pipeline 102 to monitor the leakage of the pipeline 102.
In this embodiment, the metal probe 120 is inserted into the soil near the pipe 102, and the metal probe 120 may be parallel to the sensing cable 110 or may be inserted into the soil at any angle.
Fig. 3 is a schematic diagram of a sensor cable 110 in a sensor cable 100 according to an embodiment of the invention. As shown in fig. 3, the sensing cable 110 includes a coaxial cable 111 and an electric wire 112 which are parallel to each other and insulated from each other. That is, in the present embodiment, the sensing cable 110 is composed of one coaxial cable 111 and one electric wire 112.
Fig. 4 is a cross-sectional view of a sensor cable 110 in a sensor cable 100 according to an embodiment of the present invention. As shown in fig. 4, in the present embodiment, the coaxial cable 111 includes: an inner metal conductor 111a, a first insulating material layer 111b coated outside the inner conductor, an outer metal conductor 111c provided outside the first insulating material layer 111b, an outer sheath 111d coated outside the outer metal conductor 111c, and a second insulating material layer 111e provided outside the outer sheath 111 d; the wire 112 includes a wire 112a and a third insulating material layer 112b coated on the outside of the wire 112 a.
In this embodiment, the coaxial cable 111 and the electric wire 112 are covered with a copper wire shielding layer.
Specifically, in the present embodiment, as shown in fig. 5, the sensing cable 100 is laid along the base groove of the pipe 102 and is parallel to the pipe 102; the connector 130 of the sensor cable 100 is connected to an interface within the conduit well 101 of the conduit 102. Further, the portion of the sensing cable 100 from the conduit well 101 to the underground conduit 102 is shielded and insulated by wrapping with copper wires 113.
In this embodiment, the connector 130 includes a protective housing and a connection terminal, as shown in fig. 2, one terminal of the connection terminal is connected to the sensing cable 100 and the identification chip 140, and the other terminal of the connection terminal is used to connect to the tester 200. That is, in the present embodiment, the identification chip 140 for identifying the signal sensing cables 110 is connected to the connector 130, and the identification chip 140 of each signal sensing cable 110 is unique and has a corresponding ID number. When the tester 200 is connected to the connector 130 coming out of the tubing well, the id number of the identification chip 140 will be automatically obtained. The ID number may be associated with all information of the sensor cable 110 and the conduit 102 history by software.
In this embodiment, the tester 200 transmits a film-punched electromagnetic signal to the sensor cable 100, and obtains the ID information of the sensor cable 110 and the dielectric constant of the soil surrounding the pipe 102 based on the reflected signal received from the sensor cable 100; the terminal device 300 analyzes and acquires the leakage position of the pipe 102 based on the dielectric constant acquired by the tester 200. The tester 200 generates a film-punching electromagnetic signal, measures the dielectric constant of an object around the cable through the coaxial cable 111, and the tester 200 simultaneously reads the dielectric constant value and transmits it to the monitoring terminal device 300 for numerical analysis.
In this embodiment, the tester 200 is a TDR tester 200, and the tester 200 includes a signal generator, a signal collector, and data analysis software. Wherein the data analysis software includes, but is not limited to, at least one data analysis software application.
In this embodiment, the tester 200 uses a travel time method to obtain the propagation speed of the film impact electromagnetic signal and the dielectric constant of the soil surrounding the pipe 102.
The device in this embodiment monitors the positioning mechanism to determine whether the pipe 102 has leakage by measuring the change in the relative permittivity (dielectric constant) of the soil mass in the vicinity of the pipe 102 by Time Domain Reflectometry (TDR). After the pipe 102 leaks, the water content and/or solute characteristics of the surrounding soil mass change, thereby causing a change in the relative permittivity. By laying the monitoring sensor cable 100 along the pipeline, the change in the dielectric constant of the soil mass surrounding the pipeline 102 is periodically tested to determine if a leak has occurred and to locate the location of the leak.
The dielectric constants vary widely between different media. The soil body is a three-phase medium consisting of different mineral particles, water and air. The dielectric constant of air epsilon a=1 (no polarization in vacuum), and the electrical conductivity of air sigma a=0. Soil particles are nonpolar materials that only undergo electronic and ionic polarization, the oscillation frequency of which is greater than 1THz (1012 Hz), so that their dielectric constant is very low (ess=3) and is free from energy loss, and when the test frequency is less than, the soil particle dielectric constant value is independent of frequency and temperature. The conductivity σa of the soil particles=0. For polar materials, such as water, there is a turning polarization in addition to ionic and electronic polarization, so it has a fairly high dielectric constant. The dielectric constant of water is frequency dependent and also temperature dependent, as temperature affects the dielectric loss due to steering polarization.
Related researches show that besides the volume water content, factors such as temperature, dry density (volume weight), soil texture, organic matter content, salt content, test frequency and the like have great influence on the dielectric constant of the soil body.
In this embodiment, the voltage pulse emitted by the TDR tester 200 propagates and reflects in the probe and medium in the form of electromagnetic waves. The reflected signal is received by the TDR tester 200 and stored in the monitoring terminal apparatus 300. The dielectric constant and the conductivity of the measured medium can be obtained through analysis of the reflected waveform. Since the dielectric constant of water is much greater than that of the dry geotechnical medium, the water content of the geotechnical medium plays a decisive role in its dielectric constant. And obtaining the water content of the measured medium through a relation model of the dielectric constant and the water content of the rock-soil medium.
The travel time method tests the propagation velocity v of electromagnetic wave in the medium, the propagation velocity v of electromagnetic wave in the rock-soil medium and the dielectric constant K of the medium a In relation, the TDR time of flight test waveform is shown in fig. 6. In fig. 6, a is the reflection at the coaxial cable 111 and coaxial converter interface; b is the initial point of the reflection-corresponding pulse width at the juncture of the air segment and the medium surface; c is the end point of the reflection-corresponding pulse width at the juncture of the air segment and the medium surface; d is the reflection at the end of the metal probe 120.
When the electromagnetic wave reaches the interface between the coaxial cable 111 and the coaxial converter after propagating through the coaxial transmission line, the reflected waveform rises, i.e., point a in fig. 6, because the coaxial converter impedance is greater than the coaxial cable 111; when the electromagnetic wave passes through the coaxial converter and reaches the interface of the coaxial converter and the air section, the reflected wave forms rise again, namely the point B in the figure 6, because the impedance of the air section is larger than that of the coaxial converter; when the electromagnetic wave passes through the air section and reaches the junction between the air section and the medium surface, the reflection waveform starts to drop because the medium impedance is smaller than the air section impedance, and the reflection at the interface starts to end from the point B to the point C because of the influence of the pulse width; the electromagnetic wave then propagates in the medium up to the probe tips, where the reflected waveform rises again, point D in fig. 6, because the probe tip impedance is greater than the impedance of the medium between the probes.
The propagation speed of the electromagnetic wave in the medium can be obtained by the time difference Δt between the two points of the waveform B to D in fig. 6, that is, the propagation time of the electromagnetic wave in the medium, which is:
specifically, in this embodiment, one calculation method of the dielectric constant is as follows:
wherein K is a Is dielectric constant, L is metal inserted into soilThe length of the probe 120, c, is the end point of the reflection-corresponding pulse width at the interface of the air segment and the medium surface, and Δt is the time difference between the start point of the reflection-corresponding pulse width at the interface of the air segment and the medium surface and the reflection point at the end of the probe.
According to the travel time method, an ASCII waveform output by the TDR tester 200 is derived, and a sample time-reflection coefficient and a time-reflection coefficient first derivative image are obtained in Origin software.
In this embodiment, the monitoring terminal device 300 obtains the current TDR graph of the sensing cable 110 based on the dielectric constant obtained by the tester 200, and compares the current TDR graph of the sensing cable 110 with the historical TDR graph of the sensing cable 110 to determine the leakage position of the pipe 102. As can be seen from fig. 7, a very large mutation occurred in the vicinity of 18.5 m, and it was determined that an abnormal leak occurred at this point.
The data collected by the tester 200 is output as a CSV format file, which can be opened for viewing and editing by using EXCEL at the monitoring terminal device 300.
From a physical point of view, the velocity factor in the coaxial cable 111 is independent of the surrounding environment. The speed factor is specified by the manufacturer in a data table. From this fact, the exact length of the monitoring sensor cable 110 can be defined.
In this embodiment, the monitoring terminal device 300 includes, but is not limited to, a mobile terminal or a fixed terminal; the mobile terminal comprises a notebook computer, a smart phone or a tablet computer; the fixed terminal is, for example, a server, a desktop, etc.
The device in the embodiment can be used for pipelines made of any materials (cast iron, PE, cement, concrete and the like) and is not influenced by factors such as pipeline diameter, pipeline pressure, external environment and the like.
When the pipeline 102 is constructed, the sensing cable 100 is laid along the base groove of the pipeline 102 and is parallel to the pipeline 102. The connector 130 interface end of the sensor cable 100 may enter the tubing well 101 of the tubing 102, and when the tubing 102 needs to be tested, the tester 200 is connected to the interface end of the tubing well 101, and the user's monitoring terminal device 300 is used for testing, so as to locate the broken position of the tubing 102 according to the distance between the leakage point and the tubing well.
In summary, the sensing cable is arranged beside the pipeline, so that the pipeline can be subjected to leakage detection and positioning by acquiring the dielectric constant of soil near the pipeline. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A sensing cable for use in monitoring pipe leakage, comprising: a metal probe, a sensing cable, a connector and an identification chip;
the metal probe is used for being inserted into soil near the pipeline;
one end of the sensing cable is connected with the probe, the other end of the sensing cable is connected with the connector, and the sensing cable comprises coaxial cables and wires which are parallel to each other and insulated from each other;
the identification chip is connected with the connector and used for storing and identifying the ID of the monitoring sensing cable;
the connector is used for being connected with the tester, and transmitting the received signal data of the sensing cable to the tester so that the tester can acquire the dielectric constant of soil around the pipeline to monitor pipeline leakage.
2. The sensor cable for conduit leak monitoring of claim 1 wherein the coaxial cable comprises: an inner metal conductor, a first insulating material layer coated outside the inner conductor, an outer metal conductor arranged outside the first insulating material layer, an outer sheath coated outside the outer metal conductor and a second insulating material layer arranged outside the outer sheath; the electric wire comprises a metal wire and a third insulating material layer coated outside the metal wire.
3. A sensing cable for pipe leakage monitoring according to claim 1 or 2, wherein the coaxial cable and the outer part of the partial region of the electric wire are covered with a copper wire shielding layer together.
4. An apparatus for monitoring pipe leakage comprising a sensing cable for monitoring pipe leakage according to any one of claims 1 to 3, a tester connected to a connector of the sensing cable, and a monitoring terminal device connected to the tester;
the tester transmits a film impact electromagnetic signal to the sensing cable, and acquires sensing cable ID information and dielectric constants of soil surrounding a pipeline based on a reflected signal received from the sensing cable;
and the monitored terminal equipment analyzes and acquires the leakage position of the pipeline based on the dielectric constant acquired by the tester.
5. The apparatus for pipeline leak monitoring of claim 4, wherein the tester is a TDR tester, the tester including a signal generator, a signal collector, and data analysis software.
6. The apparatus for pipeline leakage monitoring according to claim 4 or 5, wherein the tester uses a travel time method to obtain the propagation speed of the membrane flushing electromagnetic signal and the dielectric constant of the soil surrounding the pipeline.
7. The apparatus for monitoring pipe leakage according to claim 6, wherein one way of calculating the dielectric constant is:
wherein K is a And L is the length of a metal probe inserted into the soil body, c is the end point of the reflection-corresponding pulse width at the juncture of the air segment and the medium surface, and deltat is the time difference between the starting point of the reflection-corresponding pulse width at the juncture of the air segment and the medium surface and the reflection point at the tail end of the probe.
8. The apparatus for pipe leakage monitoring according to claim 6 or 7, wherein the monitoring terminal device obtains a current TDR profile of a sensing cable based on the permittivity obtained by the tester, and compares the current TDR profile of the sensing cable with a historical TDR profile of the sensing cable to determine a pipe leakage position.
9. The apparatus for pipe leak monitoring of claim 1, wherein the sensing cable is routed along the pipe base slot and parallel to the pipe; the connector of the sensing cable is connected to the tubing well interface of the tubing.
10. The apparatus for pipe leak monitoring of claim 1 wherein the sensing cable section of the pipe well to the subsurface is shielded and insulated with a copper wire wrap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310610049.8A CN116718322A (en) | 2023-05-26 | 2023-05-26 | Sensing cable and device for pipeline leakage monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310610049.8A CN116718322A (en) | 2023-05-26 | 2023-05-26 | Sensing cable and device for pipeline leakage monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116718322A true CN116718322A (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310610049.8A Pending CN116718322A (en) | 2023-05-26 | 2023-05-26 | Sensing cable and device for pipeline leakage monitoring |
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| Country | Link |
|---|---|
| CN (1) | CN116718322A (en) |
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2023
- 2023-05-26 CN CN202310610049.8A patent/CN116718322A/en active Pending
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