CN110873293A - Pulse distance system and method for damage point of pipeline anticorrosive coating - Google Patents
Pulse distance system and method for damage point of pipeline anticorrosive coating Download PDFInfo
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- CN110873293A CN110873293A CN201811024244.8A CN201811024244A CN110873293A CN 110873293 A CN110873293 A CN 110873293A CN 201811024244 A CN201811024244 A CN 201811024244A CN 110873293 A CN110873293 A CN 110873293A
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- 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 invention provides a pulse distance system and a pulse distance method for a damaged point of a pipeline anticorrosive coating, wherein the system comprises the following steps: the device comprises a cathode protection power supply, a signal source, a high-frequency pulse sensor, a detection plate, a metal pipeline and a pipeline anticorrosive coating; the cathode of the cathode protection power supply is connected with the metal pipeline, and the anode is grounded; the output end of the signal source is connected with the metal pipeline; when the pipeline anticorrosive coating is damaged, the cathode protection power supply is disconnected, and a signal source is connected, wherein the signal source is used for providing a high-frequency pulse signal, and the high-frequency pulse signal is transmitted along the metal pipeline; the high-frequency pulse sensor is connected with the signal source and used for detecting a high-frequency pulse signal and transmitting the high-frequency pulse signal to the detection board; the detection board receives the high-frequency pulse signal transmitted by the high-frequency pulse sensor in real time, and determines the position of a damaged point of the pipeline anticorrosive coating according to the time and the waveform of the received high-frequency pulse signal transmitted by the high-frequency pulse sensor. The invention has simple structure, small investment and convenient operation, and can accurately position faults.
Description
Technical Field
The invention relates to the technical field of pipelines, in particular to a pulse distance system and a pulse distance method for a damaged point of an anticorrosive coating of a pipeline.
Background
The pipeline is mostly buried under the ground, and the medium leakage phenomenon can be caused due to the damage of the pipeline caused by the corrosion of the pipeline, the action of internal and external force, the incompactness of a joint part and the like. Part of the pipe sections are in overhead and exposed states, and the anticorrosive coating is exposed on the ground surface all year round and is easy to age and lose efficacy after being irradiated by ultraviolet rays for a long time. In addition, the corrosion-resistant coating is easy to damage by human, and the phenomena of multiple damage or overall aging of the corrosion-resistant coating often occur. The corrosion damage causes sudden and serious vicious accidents, which often cause huge economic loss and serious social consequences. The method has the advantages that the outer anticorrosive layer of the pipeline is detected, the position of hidden danger of the pipeline is found in time, specific maintenance and replacement suggestions are provided, and the method becomes an important means for effectively enhancing the safe operation reliability of the pipeline.
Whether the pipeline leaks or not is judged by observing the changes of the flow and the pressure value, the pipeline leakage detection device is insensitive to tiny leakage, and meanwhile, the position of the leakage point cannot be accurately measured. At present, the method of direct current potential gradient method, alternating current potential gradient method, current gradient method and close-spaced potential test method are generally adopted for positioning the damage point of the pipeline anticorrosive coating. The potential gradient method needs to carry out detection along the line, the current gradient method is lack of intuition in detection results and is easy to be interfered by external electromagnetic, the close-spaced potential test method needs to carry out detection along the line, and is likely to be influenced by interference current, a cable needs to be pulled, and the application range is limited. The above method often causes the situation that the detection evaluation result is not in accordance with the actual situation in the actual detection, and the existing detection technology cannot be applied to part of pipelines.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a pulse distance system and a pulse distance method for damaged points of a pipeline anticorrosive coating.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a pulse distance system for a pipe anticorrosive coating damage point, comprising: the device comprises a cathode protection power supply, a signal source, a high-frequency pulse sensor, a detection plate, a metal pipeline and a pipeline anticorrosive coating;
the cathode of the cathode protection power supply is connected with the metal pipeline through a first switch, and the anode of the cathode protection power supply is grounded; the output end of the signal source is connected with the metal pipeline through a second switch; when the pipeline anticorrosive coating is damaged, the cathode protection power supply is disconnected by controlling the first switch, and the signal source is connected by controlling the second switch, wherein the signal source is used for providing a high-frequency pulse signal which is transmitted along the metal pipeline; the high-frequency pulse signal is transmitted to the damaged point along the metal pipeline, and is refracted and reflected at the damaged point;
the high-frequency pulse sensor is connected with the signal source and used for detecting a high-frequency pulse signal and transmitting the detected high-frequency pulse signal to the detection board when the high-frequency pulse signal is detected; the detection board receives the high-frequency pulse signal transmitted by the high-frequency pulse sensor in real time, and determines the position of a damaged point of the pipeline anticorrosive coating according to the time and the waveform of the received high-frequency pulse signal transmitted by the high-frequency pulse sensor.
Furthermore, the high-frequency pulse sensor firstly detects a high-frequency pulse signal sent by the signal source and transmits the high-frequency pulse signal to the detection board, and the detection board records the waveform of the high-frequency pulse signal and the corresponding detection time t1；
The high-frequency pulse signal sent by the signal source is reflected and refracted at the damaged point when transmitted along the metal pipeline, the high-frequency pulse sensor detects the reflected pulse signal and transmits the reflected pulse signal to the detection board, and the detection board identifies the reflected pulse signal and records the waveform of the reflected pulse signal and the corresponding detection time t2；
Said detection board is according to t1And t2Determining two pulsesThe time interval △ t of the signal, and the distance from the breakage point to the measuring point is calculated according to the transmission speed v of the high-frequency pulse signal in the metal pipeline and the time interval △ t.
Further, the detection board is used for identifying according to two factors of the arrival time of the signal and the waveform when identifying the reflected pulse signal.
Further, the detection plate calculates the distance from the damaged point to the measurement point by using a formula L ═ v × △ t)/2 according to the transmission speed v of the high-frequency pulse signal in the metal pipeline and the time interval △ t.
Further, the transmission speed v of the high-frequency pulse signal in the metal pipeline is obtained through pre-calibration;
the pre-calibration process comprises the following steps: injecting a high-frequency pulse signal into one end of a preset metal pipeline with the length of S, detecting the time t of the injected high-frequency pulse signal going back and forth once at the end, and acquiring v by using a formula v as 2S/t; the preset metal pipeline and the metal pipeline are made of the same material.
Further, the frequency of the injected high-frequency pulse signal is 0MHz-5 MHz.
Furthermore, the detection board and the detected circuit are in an isolation state, so that the detection board is protected and the safety of personnel is guaranteed.
In a second aspect, the present invention also provides a pipe corrosion protection layer damage point pulse spacing method based on the pipe corrosion protection layer damage point pulse spacing system as described in the first aspect above, the method comprising:
s1, acquiring the transmission speed v of the high-frequency pulse signal in the metal pipeline in a pre-calibration mode;
s2, when the pipeline anticorrosive coating is detected to be damaged, the cathode protection power supply is disconnected by controlling the first switch, and the signal source is connected by controlling the second switch, wherein the signal source is used for providing a high-frequency pulse signal, and the high-frequency pulse signal is transmitted along the metal pipeline; the high-frequency pulse signal is transmitted to the damaged point along the metal pipeline, and is refracted and reflected at the damaged point;
s3, the high-frequency pulse sensor firstly detects the high-frequency pulse signal sent by the signal source and transmits the high-frequency pulse signal to the detection board, and the detection board records the waveform of the high-frequency pulse signal and the corresponding detection time t1(ii) a The high-frequency pulse signal sent by the signal source is reflected and refracted at the damaged point when transmitted along the metal pipeline, the high-frequency pulse sensor detects the reflected pulse signal and transmits the reflected pulse signal to the detection board, and the detection board identifies the reflected pulse signal and records the waveform of the reflected pulse signal and the corresponding detection time t2(ii) a Said detection board is according to t1And t2Determining the time interval △ t of the two pulse signals;
s4, calculating the distance from the breakage point to the measurement point using the formula L ═ v × △ t)/2.
Further, the S1 specifically includes:
injecting a high-frequency pulse signal into one end of a preset metal pipeline with the length of S, detecting the time t of the injected high-frequency pulse signal going back and forth once at the end, and acquiring v by using a formula v as 2S/t; the preset metal pipeline and the metal pipeline are made of the same material.
Further, the detection board is used for identifying according to two factors of the arrival time of the signal and the waveform when identifying the reflected pulse signal.
According to the technical scheme, the pulse distance system for the damaged point of the pipeline anticorrosive coating, provided by the invention, has the advantages that the damaged point is positioned by injecting the pulse signal into the signal source, the electromagnetic interference is not easy to cause, and the position of the damaged point can be more accurately determined. In addition, in the invention, the detection board automatically monitors the pulse signal, finds the damaged point, has visual measurement result, improves the monitoring accuracy and provides guarantee for fault maintenance. In addition, in the invention, the detection board can be modified by utilizing the existing equipment in the cathodic protection station, and the detection does not need to carry equipment or drag a cable, and does not need to carry along the line for detection, thereby having small investment and convenient operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a pipeline corrosion protection layer damage point pulse spacing system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the operation of a pulse distance system for locating a damaged point of a corrosion protection layer of a pipeline according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for pulse spacing a damaged point of a corrosion protection layer of a pipeline according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a pulse distance system for a damaged point of a pipeline anticorrosive coating, referring to fig. 1, the system includes: the device comprises a cathode protection power supply 1, a signal source 2, a high-frequency pulse sensor 3, a detection plate 4, a metal pipeline 5 and a pipeline anticorrosive coating 6;
the cathode of the cathode protection power supply 1 is connected with the metal pipeline 5 through a first switch, and the anode of the cathode protection power supply 1 is grounded; the output end of the signal source 2 is connected with the metal pipeline 5 through a second switch; when the pipeline anticorrosive coating 6 is damaged, the cathode protection power supply 1 is disconnected by controlling the first switch, and the signal source 2 is connected by controlling the second switch, wherein the signal source 2 is used for providing a high-frequency pulse signal, and the high-frequency pulse signal is transmitted along the metal pipeline 5; wherein, the high-frequency pulse signal is transmitted to the damaged point along the metal pipeline 5, and is refracted and reflected at the damaged point;
the high-frequency pulse sensor 3 is connected with the signal source 2 and used for detecting a high-frequency pulse signal and transmitting the detected high-frequency pulse signal to the detection plate 4 when the high-frequency pulse signal is detected; the detection board 4 receives the high-frequency pulse signal transmitted by the high-frequency pulse sensor 3 in real time, and determines the position of a damaged point of the pipeline anticorrosive coating 6 according to the time and the waveform of the received high-frequency pulse signal transmitted by the high-frequency pulse sensor 3.
According to the technical scheme, the pipeline anticorrosive coating damage point pulse distance system provided by the embodiment utilizes the mode of injecting the pulse signal into the signal source to position the damage point, and is not easy to be subjected to electromagnetic interference, so that the position of the damage point can be more accurately determined. In addition, in this embodiment, the pick-up plate automatic monitoring pulse signal, the discovery damaged point, measuring result is directly perceived, has improved the monitoring accuracy degree, provides the guarantee for the breakdown maintenance. In addition, in this embodiment, the detection board can be modified by using the existing equipment in the cathodic protection station, and the detection does not need to carry equipment or drag a cable, and does not need to carry along the line for detection, so that the investment is low, and the operation is convenient.
In a preferred embodiment, the rf pulse sensor 3 first detects the rf pulse signal from the signal source 2 and transmits the rf pulse signal to the detection board 4, and the detection board 4 records the waveform of the rf pulse signal and the corresponding detection time t1；
The high-frequency pulse signal sent by the signal source 2 is refracted and reflected at the damaged point when transmitted along the metal pipeline 5, the high-frequency pulse sensor 3 detects the reflected pulse signal and transmits the reflected pulse signal to the detection plate 4, and the detection plate 4 identifies the reflected pulse signal and records the waveform of the reflected pulse signal and the corresponding detection time t2；
Said detection plate 4 is according to t1And t2The time interval △ t of the two pulse signals is determined, and the distance from the damaged point to the measuring point is calculated according to the transmission speed v of the high-frequency pulse signal in the metal pipeline 5 and the time interval △ t.
In a preferred embodiment, the detection board 4 is used for identifying the reflected pulse signal according to two factors, namely the arrival time of the signal and the waveform. It can be understood that the detection board 4 can filter out interference waveforms according to the arrival time and the waveform of the signal, so as to identify the pulse signal reflected back, and further extract the time interval between two adjacent pulse signals.
In a preferred embodiment, the detection plate 4 calculates the distance from the damaged point to the measurement point according to the formula L (v × △ t)/2, based on the transmission speed v of the high-frequency pulse signal in the metal pipe 5 and the time interval △ t.
In a preferred embodiment, the transmission speed v of the high-frequency pulse signal in the metal pipe 5 is obtained by pre-calibration;
the pre-calibration process comprises the following steps: injecting a high-frequency pulse signal into one end of a preset metal pipeline with the length of S, detecting the time t of the injected high-frequency pulse signal going back and forth once at the end, and acquiring v by using a formula v as 2S/t; the preset metal pipeline and the metal pipeline 5 are made of the same material.
In a preferred embodiment, the frequency of the injected high-frequency pulse signal is 0MHz-5 MHz.
In a preferred embodiment, the detection board 4 is isolated from the circuit to be detected, so as to protect the detection board 4 and ensure the safety of personnel.
It should be noted that, on the premise that logics or structures of a plurality of preferred embodiments provided in this embodiment do not conflict with each other, the preferred embodiments may be freely combined, and the present invention is not limited to this.
The pulse distance system for pipeline corrosion protection layer damage point provided in this embodiment will be described in detail with reference to fig. 1. It will be appreciated that with reference to figure 1, where for a pipe with cathodic protection, the cathodic protection power supply 1 is connected cathodically to the metal pipe 5 and the anode is grounded. The signal source 2 is connected with the metal pipeline 5 and sends out a pulse signal, and the signal is transmitted along the metal pipeline 5. The high-frequency pulse sensor 3 is connected with the signal source 2 and used for detecting the pulse signal sent by the signal source 2. The detection plate 4 is connected with the high-frequency pulse sensor 3 and receives the pulse signal transmitted by the high-frequency pulse sensor 3. When the pipeline anticorrosive coating 6 is damaged, the first switch S1 is opened, the second switch S2 is closed, the signal source 2 sends out a high-frequency pulse signal, the high-frequency pulse signal sent out by the signal source 2 is firstly detected by the high-frequency pulse sensor 3 and is transmitted to the detection plate 4, and the waveform and the time of the high-frequency pulse signal are recorded by the detection plate 4. The pulse signal transmitted along the metal pipeline 5 is refracted and reflected at the damaged point, the high-frequency pulse sensor 3 detects the reflected pulse signal, the high-frequency pulse sensor 3 transmits the reflected pulse signal to the detection plate 4, and the detection plate 4 records the waveform and the time of the high-frequency pulse signal at the moment. The detection board 4 records the waveform and time of the catadioptric signal detected by the high-frequency pulse sensor 3 twice, and the amplitude of the reflected pulse signal is slightly smaller than that of the pulse signal detected by the high-frequency pulse sensor 3 for the first time. The detection board 4 automatically identifies and extracts the time of the pulse signal from the damaged point to the detection point, divides the time by 2, multiplies the propagation speed of the pulse signal in the metal pipeline 5, and calculates and analyzes to obtain the actual position of the damaged point. Therefore, the position of the damaged point can be accurately measured by using the pulse signal sent by the signal source 2.
The working process of positioning the damaged point of the pipeline corrosion protection layer by using the pulse distance system for the damaged point of the pipeline corrosion protection layer provided by the embodiment will be specifically described below with reference to the working schematic diagram shown in fig. 2.
S1, when the anticorrosive coating is damaged, the signal source 2 provides a pulse signal with the amplitude of 2kV, and the pulse signal is transmitted along the metal pipeline 5. The high-frequency pulse sensor 3 first detects a pulse signal provided by a signal source, assuming that the pulse signal corresponds to a time t1Time 0.001 s;
s2, transmitting the pulse signal to the damaged point, and generatingThe reflected pulse signal is detected by the detection board 4 through refraction and reflection, and the time is t2The time required for the pulse signal to make a round trip between the breakage point and the detection point is △ t at 0.005 s:
△t＝t2-t1＝0.005-0.001＝0.004s；
and S3, calculating the fault point distance L.
Using formula to calculate that L ═ v × △ t)/2 ═ 2 × 105The distance between the damaged point of the pipeline anticorrosive coating and the measuring point (cathode protection station) is 400 m.
Wherein v represents the transmission speed of the high-frequency pulse signal in the metal pipeline 5, and in order to improve the accuracy of the positioning result, the value of v can be obtained in a pre-calibration manner, and the value of v is 2 × 105m/s。
Accordingly, before the above step S1 is performed, the following step S0 is preferably performed.
And S0, acquiring the transmission speed v of the high-frequency pulse signal in the metal pipeline 5 in a pre-calibration mode.
In this step, the pre-calibration process includes: injecting a high-frequency pulse signal into one end of a preset metal pipeline with the length of S (such as S being 100m), detecting the time t (such as t being 0.001S) of the injected high-frequency pulse signal going back and forth at the end, and acquiring v (such as v being 2 multiplied by 10) by using the formula v being 2S/t5m/s); it can be understood that, in order to improve the accuracy of the positioning of the final damaged point, when the transmission speed v of the high-frequency pulse signal in the metal pipe 5 is obtained in a pre-calibration manner, the material of the selected preset metal pipe is consistent with the metal pipe used in the actual positioning.
Another embodiment of the present invention provides a method for pulse spacing damaged points of a pipeline anticorrosive coating, which is implemented based on the pulse spacing system for damaged points of a pipeline anticorrosive coating described in the above embodiment, specifically, referring to fig. 3, and includes the following steps:
step 101: and acquiring the transmission speed v of the high-frequency pulse signal in the metal pipeline in a pre-calibration mode.
Step 102: when the pipeline anticorrosive coating is detected to be damaged, the cathode protection power supply is disconnected by controlling the first switch, and the signal source is connected by controlling the second switch, wherein the signal source is used for providing a high-frequency pulse signal, and the high-frequency pulse signal is transmitted along the metal pipeline; wherein the high-frequency pulse signal is transmitted to the damaged point along the metal pipeline, and is refracted and reflected at the damaged point.
Step 103: the high-frequency pulse sensor firstly detects a high-frequency pulse signal sent by the signal source and transmits the high-frequency pulse signal to the detection board, and the detection board records the waveform of the high-frequency pulse signal and the corresponding detection time t1(ii) a The high-frequency pulse signal sent by the signal source is reflected and refracted at the damaged point when transmitted along the metal pipeline, the high-frequency pulse sensor detects the reflected pulse signal and transmits the reflected pulse signal to the detection board, and the detection board identifies the reflected pulse signal and records the waveform of the reflected pulse signal and the corresponding detection time t2(ii) a Said detection board is according to t1And t2The time interval △ t of the two pulse signals is determined.
And 104, calculating the distance between the damaged point and the measuring point by using the formula L-v- △ t)/2.
In a preferred embodiment, the step 101 specifically includes:
injecting a high-frequency pulse signal into one end of a preset metal pipeline with the length of S, detecting the time t of the injected high-frequency pulse signal going back and forth once at the end, and acquiring v by using a formula v as 2S/t; the preset metal pipeline and the metal pipeline are made of the same material.
In a preferred embodiment, the detection board 4 is used for identifying the reflected pulse signal according to two factors, namely the arrival time of the signal and the waveform.
Since the pulse distance method for the damaged point of the pipeline anticorrosive coating provided by the embodiment is implemented based on the pulse distance system for the damaged point of the pipeline anticorrosive coating provided by the above embodiment, the principle and the technical effect are similar, and therefore, detailed description is omitted here.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A pipeline anticorrosive coating damage point pulse distance system, its characterized in that includes: the device comprises a cathode protection power supply, a signal source, a high-frequency pulse sensor, a detection plate, a metal pipeline and a pipeline anticorrosive coating;
the cathode of the cathode protection power supply is connected with the metal pipeline through a first switch, and the anode of the cathode protection power supply is grounded; the output end of the signal source is connected with the metal pipeline through a second switch; when the pipeline anticorrosive coating is damaged, the cathode protection power supply is disconnected by controlling the first switch, and the signal source is connected by controlling the second switch, wherein the signal source is used for providing a high-frequency pulse signal which is transmitted along the metal pipeline; the high-frequency pulse signal is transmitted to the damaged point along the metal pipeline, and is refracted and reflected at the damaged point;
the high-frequency pulse sensor is connected with the signal source and used for detecting a high-frequency pulse signal and transmitting the detected high-frequency pulse signal to the detection board when the high-frequency pulse signal is detected; the detection board receives the high-frequency pulse signal transmitted by the high-frequency pulse sensor in real time, and determines the position of a damaged point of the pipeline anticorrosive coating according to the time and the waveform of the received high-frequency pulse signal transmitted by the high-frequency pulse sensor.
2. The system of claim 1, wherein the hf pulse sensor first detects the hf pulse signal from the signal source and applies the hf pulse signal to the rf pulse signalThe high-frequency pulse signal is transmitted to the detection board, and the detection board records the waveform of the high-frequency pulse signal and the corresponding detection time t1；
The high-frequency pulse signal sent by the signal source is reflected and refracted at the damaged point when transmitted along the metal pipeline, the high-frequency pulse sensor detects the reflected pulse signal and transmits the reflected pulse signal to the detection board, and the detection board identifies the reflected pulse signal and records the waveform of the reflected pulse signal and the corresponding detection time t2；
Said detection board is according to t1And t2Determining △ t time interval of two pulse signals, and calculating the distance from the damage point to the measuring point according to the transmission speed v of the high-frequency pulse signal in the metal pipeline and the time interval △ t.
3. The system of claim 2, wherein said detection board is adapted to identify said reflected pulse signal based on both the time of arrival of the signal and the waveform factor.
4. The system of claim 2, wherein said detection board calculates the distance from said breakage point to said measurement point according to the transmission speed v of said high frequency pulse signal in said metal pipe and said time interval △ t by using the formula L (v x △ t)/2.
5. The system according to any one of claims 2 to 4, wherein the transmission speed v of the high-frequency pulse signal in the metal pipeline is obtained through pre-calibration;
the pre-calibration process comprises the following steps: injecting a high-frequency pulse signal into one end of a preset metal pipeline with the length of S, detecting the time t of the injected high-frequency pulse signal going back and forth once at the end, and acquiring v by using a formula v as 2S/t; the preset metal pipeline and the metal pipeline are made of the same material.
6. The system of claim 5, wherein the injected high frequency pulse signal has a frequency of 0MHz-5 MHz.
7. The system of claim 1, wherein the detection board is isolated from the circuit under test to protect the detection board and to ensure personnel safety.
8. A pipeline anticorrosive coating damage point pulse distance method based on the pipeline anticorrosive coating damage point pulse distance system according to any one of claims 1 to 7, is characterized by comprising the following steps:
s1, acquiring the transmission speed v of the high-frequency pulse signal in the metal pipeline in a pre-calibration mode;
s2, when the pipeline anticorrosive coating is detected to be damaged, the cathode protection power supply is disconnected by controlling the first switch, and the signal source is connected by controlling the second switch, wherein the signal source is used for providing a high-frequency pulse signal, and the high-frequency pulse signal is transmitted along the metal pipeline; the high-frequency pulse signal is transmitted to the damaged point along the metal pipeline, and is refracted and reflected at the damaged point;
s3, the high-frequency pulse sensor firstly detects the high-frequency pulse signal sent by the signal source and transmits the high-frequency pulse signal to the detection board, and the detection board records the waveform of the high-frequency pulse signal and the corresponding detection time t1(ii) a The high-frequency pulse signal sent by the signal source is reflected and refracted at the damaged point when transmitted along the metal pipeline, the high-frequency pulse sensor detects the reflected pulse signal and transmits the reflected pulse signal to the detection board, and the detection board identifies the reflected pulse signal and records the waveform of the reflected pulse signal and the corresponding detection time t2(ii) a Said detection board is according to t1And t2Determining the time interval △ t of the two pulse signals;
s4, calculating the distance from the breakage point to the measurement point using the formula L ═ v × △ t)/2.
9. The method according to claim 8, wherein the S1 specifically includes:
injecting a high-frequency pulse signal into one end of a preset metal pipeline with the length of S, detecting the time t of the injected high-frequency pulse signal going back and forth once at the end, and acquiring v by using a formula v as 2S/t; the preset metal pipeline and the metal pipeline are made of the same material.
10. The method of claim 8, wherein said detection board is used to identify said reflected pulse signal based on both the time of arrival of the signal and the waveform factor.
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| CN101127928A (en) * | 2007-09-11 | 2008-02-20 | 电子科技大学 | Method and device for testing network cable failure |
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| CN203534783U (en) * | 2013-10-29 | 2014-04-09 | 陕西安泰科石油技术工程有限公司 | Long-distance transport line internal coating external ground wire open type electric spark leakage detection device |
| CN104295907A (en) * | 2014-08-12 | 2015-01-21 | 上海中联重科桩工机械有限公司 | System and method for detecting blockage position of pipeline |
| CN104928684A (en) * | 2015-05-08 | 2015-09-23 | 中国石油化工股份有限公司 | Buried pipeline cathode protection data transmission system |
| CN205719450U (en) * | 2016-06-08 | 2016-11-23 | 重庆科技学院 | Oil and gas pipes external anti-corrosion layer integrity simulation detection system |
| CN108334607A (en) * | 2018-02-02 | 2018-07-27 | 中石油管道有限责任公司西部兰州输气分公司 | A kind of buried pipeline external anti-corrosion layer breakage detection method and system |
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