CN1766404A - Automatic monitoring and evaluating system for interference corrosion of embedded metal pipeline - Google Patents
Automatic monitoring and evaluating system for interference corrosion of embedded metal pipeline Download PDFInfo
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- CN1766404A CN1766404A CN 200510047782 CN200510047782A CN1766404A CN 1766404 A CN1766404 A CN 1766404A CN 200510047782 CN200510047782 CN 200510047782 CN 200510047782 A CN200510047782 A CN 200510047782A CN 1766404 A CN1766404 A CN 1766404A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 61
- 230000007797 corrosion Effects 0.000 title claims abstract description 60
- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 239000002184 metal Substances 0.000 title claims description 38
- 229910052751 metal Inorganic materials 0.000 title claims description 38
- 238000012806 monitoring device Methods 0.000 claims description 55
- 238000005259 measurement Methods 0.000 claims description 40
- 238000011156 evaluation Methods 0.000 claims description 25
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- 229910000365 copper sulfate Inorganic materials 0.000 claims description 4
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 3
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- 238000004458 analytical method Methods 0.000 abstract description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
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- 239000011248 coating agent Substances 0.000 description 1
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Abstract
The invention discloses an automatic monitor and estimation system of buried wire interference corrosion, which consists of automatic monitor device of buried wire interference corrosion and special computer system, wherein the monitor system can work independently to accomplish automatic timing staring and measure multiple points synchronously, which collects and records the data to communicate with the special computer to finish setting and reading data; the special computer system analyses and estimates the collected the data, which outputs estimation result through graph, curve and text pattern. The invention monitors the buried wire corrosion condition and provides the analysis and estimation rapidly, which can be used in the interference corrosion monitoring domain of large-scale building such as oil, gas, heating pipe and water supply pipe.
Description
The technical field is as follows: the invention relates to an automatic monitoring and evaluating system for the existence of interference corrosion of a buried metal pipeline, in particular to a device and a special computer system for monitoring whether the buried metal pipeline is threatened by the interference corrosion and the degree of the threatened by the interference corrosion.
Background art: underground pipelines carry various media for industrial and civil use, are life lines for urban survival and development and industrial production, and are the fastest vehicles. Buried metal pipelines often cause fire, explosion and poisoning accidents due to oil and gas leakage. The main cause is corrosion. Various high-low voltage transmission lines, factories, electrified railways and the like can generate interference on buried metal pipelines, so that the corrosion potential (natural potential) of the buried metal pipelines changes: (1) the corrosion potential is reduced, so that the metal is easy to lose electrons, and the metal is changed into metal ions which are dissolved in the soil to generate corrosion; (2) the corrosion potential is increased, so that the metal can easily obtain electrons, and the metal material is broken due to hydrogen embrittlement; (3) the corrosion potential is increased, so that the metal can easily obtain electrons, and the metal is more easily corroded due to the falling of the anti-corrosion coating caused by the separated hydrogen. Most of the monitoring instruments for buried pipelines in the prior art are only limited to corrosion and damage degree tests on corroded parts, but cannot perform preventive regular monitoring, and particularly cannot realize functions of multipoint synchronous measurement, analysis and evaluation of interference corrosion degree of buried pipelines and the like.
The invention content is as follows: in order to ensure the safe and effective operation of the underground pipeline, the state that the underground pipeline is interfered and corroded by the surrounding environment and the interference and corrosion degree of the underground pipeline can be synchronously detected at multiple points on the ground. The technical scheme adopted by the invention is as follows: an automatic monitoring and evaluating system for the interference corrosion of buried metal pipeline is composed of an automatic monitor and a special computer system. The device can work independently, realize automatic timing start, multipoint synchronous measurement, data acquisition and recording and special computer system communication; the special computer system is communicated with the automatic monitoring device to complete the setting and data reading of the automatic monitoring device; the collected data are analyzed and evaluated through a special computer system, and an evaluation result is output in the form of a chart, a curve and a text, so that whether the buried metal pipeline is threatened by interference corrosion or not and the degree of the threatened by the interference corrosion are rapidly evaluated. The automatic monitoring device is an intelligent instrument which can work in the field for a long time and can automatically measure and record. During each measurement, the instruments are firstly placed on each measuring point along the buried pipeline, and are uniformly started according to set time to carry out synchronous measurement and recording. After the measurement is finished, the instruments are collected back, the instruments communicate with a special computer system through a serial port, the special computer system reads recorded data, collects and stores the data, then carries out rapid analysis processing, and finally gives out an evaluation result in a curve, table and text mode.
The automatic monitoring device can monitor alternating current interference signals and direct current interference signals simultaneously, the alternating current interference signals and the direct current interference signals are processed by the alternating current signal conversion circuit and the direct current signal conversion circuit respectively and then are sent to the MCU through the acquisition switch circuit, and the real-time clock chip and the NVRAM chip are hung on a data bus of the MCU. The MCU extends an RS232 serial interface circuit for communicating with a special computer system. The special computer system is composed of a PC and a written program, and can complete two tasks: (1) measurement: before measurement, parameter setting is carried out on each monitoring device, and after measurement, data stored in the monitoring devices in a data file mode are read by a special computer system; (2) evaluation: the data are rapidly analyzed and evaluated mainly according to the interference equivalent voltage and the intensity spectrum, and an evaluation result is output.
The invention has the characteristics that: the application of the monitoring device and the special computer system realizes the multipoint synchronous monitoring of the state of the buried metal pipeline influenced by the interference and corrosion of the surrounding environment on the ground, can provide analysis and evaluation information of the interference and corrosion degree of the buried metal pipeline, and provides reliable scientific basis for searching the reasons of interference and corrosion signals, whether the tested pipeline needs to take anti-interference corrosion measures and what anti-interference corrosion measures are taken, so as to ensure the safe and effective operation of the buried metal pipeline.
The monitoring device has advanced functions, simple operation and convenient use, realizes unattended operation in the measuring process, and saves a large amount of manpower and material resources.
Due to the characteristics, the invention can be widely applied to the measurement of the interference corrosion influence of petroleum pipelines, heating pipelines, water supply pipelines, bridges, large buildings and the like.
Description of the drawings:
FIG. 1 is a functional block diagram of a special purpose computer system
FIG. 2 is a schematic block diagram of an automatic interference corrosion monitoring device for a buried metal pipeline
FIG. 3 is a circuit diagram of the signal conversion circuit of FIG. 2, i.e., the DC interference signal conversion circuit
FIG. 4 is a circuit diagram of the signal conversion circuit of FIG. 2, i.e., the AC interference signal conversion circuit
The specific implementation mode is as follows:
referring to fig. 1, 2, 3 and 4, the automatic monitoring and evaluating system for the interference corrosion of the buried metal pipeline consists of a special computer system and an automatic monitoring device. The automatic monitoring device is a monitoring device which can work independently, realizes automatic timing start, multi-point synchronous measurement, data acquisition and recording, and can communicate with a special computer system; the special computer system is communicated with the automatic monitoring device to complete the setting and data reading of the automatic monitoring device; the collected data are analyzed and evaluated through a special computer system, and an evaluation result is output in the form of a chart, a curve and a text, so that whether the buried metal pipeline is threatened by interference corrosion or not and the degree of the threatened by the interference corrosion are rapidly evaluated.
The automatic monitoring device can monitor alternating current interference signals and direct current interference signals simultaneously, the alternating current interference signals and the direct current interference signals are processed by the alternating current signal conversion circuit and the direct current signal conversion circuit respectively and then are sent to the MCU through the acquisition switch circuit, and the real-time clock chip and the NVRAM chip are hung on a data bus of the MCU. The MCU extends an RS232 serial interface circuit for communicating with a special computer system. The direct current signal conversion circuit converts direct current interference signals from a copper sulfate reference electrode and a buried metal pipeline test pile into appropriate measurement voltage. R05, R06 and R07 form a voltage division circuit, C04 bypasses high-frequency interference, D3 and D4 are amplitude limiting devices, and R08 is a matching resistor which sends signal voltage to a next-stage circuit. The monitoring range of the direct current interference signal is-20 to +20V, and the measurement precision is 0.001V. The alternating current signal conversion circuit converts alternating current interference signals from the copper sulfate reference electrode and the buried metal pipeline test pile into proper measurement voltage; c01 is a direct current blocking capacitor, R01, R02 and R03 form a voltage division circuit, C02, C03 and C05 bypass high-frequency interference, D1 and D2 are amplitude limiting devices, R04 is matched with a resistor, AD736 is an alternating current true effective value conversion circuit, and C06, C07 and C08 are peripheral devices required by the AD736 in work; the signal voltage is output from the 6 th pin of the AD 736. The monitoring range of the alternating current interference signal is 0-200V, and the measurement precision is 0.01V.
The special computer system is composed of a PC and a written program, and can complete two tasks: (1) measurement: before measurement, parameter setting is carried out on each monitoring device, and after measurement, data stored in the monitoring devices in a data file mode are read by a special computer system; (2) evaluation: the data are rapidly analyzed and evaluated mainly according to the interference equivalent voltage and the intensity spectrum, and an evaluation result is output. Wherein,
the parameter setting items are as follows: instrument number, test date, measurement start time, measurement duration, measurement pile number, measurement mode and communication rate. And the evaluation is to display a data table, a corrosion potential curve and an intensity spectrogram on a screen of a computer, and print and output the data table, the corrosion potential curve and the intensity spectrogram and the evaluation conclusion text by a printer. The corrosion potential curve is drawn according to the time corresponding relation of multipoint synchronous monitoring data, and an important basis is provided for judging the reason of the generation of the interference corrosion signal.
Example (b): the automatic monitoring and evaluating system for interference corrosion of buried metal pipeline consists of special computer system and automatic monitoring device. In summary, it can be divided into: the automatic monitoring device, namely the monitoring device, which is composed of the high-performance low-power consumption MCU, realizes data acquisition, signal processing and storage recording; the on-line communication between the automatic monitoring device and a special computer system is realized under a specific communication protocol, and the parameter setting, data reading and transmission of the instrument are realized by using the on-line communication; and processing, analyzing and evaluating the acquired data by using data processing software of a special computer system.
The automatic monitoring device of the buried metal pipeline interference corrosion monitoring and analyzing system takes a high-performance low-power consumption MCU (89S51) as a main control element to control the operation of the whole device; the signal conversion circuit is used for converting an alternating current or direct current interference signal into a circuit for measuring a voltage signal; in order to simultaneously monitor alternating current and direct current interference signals, an acquisition switch circuit is applied in the device to realize alternating current and direct current acquisition; the AD conversion circuit is used for converting the acquired signals into digital signals, inputting the digital signals into the MCU, storing the digital signals after conversion processing, and selecting a 4-bit half-integral chip ICL7035 by the A/D converter; in order to prevent data loss, a large-capacity nonvolatile RAM data memory is used for recording acquired data, the data can be stored for more than 10 years under the condition of power failure, a chip is HK1255 produced by HONHKONG company, and the chip is NVRAM with the capacity of 512K; in order to realize multipoint synchronous measurement, a real-time clock circuit chip DS12C887 is adopted to realize synchronous timing starting; because the device works in the field for a long time, no keyboard or display device is designed, and the device is arranged by communicating with a special computer system through an RS232 interface circuit; the power supply circuit is used for converting the voltage of the battery into +5V and-5V voltages required by the whole system, and the main chips are 7805 and ICL 7660. To implement the technical scheme of the invention, firstly, the special computer system and the monitoring devices are in communication connection, namely, according to the requirements of test engineering, test parameter setting and communication protocol determination are carried out on each monitoring device through a user interface of the special computer system; the set items include: instrument number, year, month and day of test date, measurement start hour and minute, actual measurement hour and minute, AC and DC information, etc. In these setting items, the test date and the measurement start time parameter determine the time when the monitoring device automatically starts the measurement. Placing each set monitoring device at each testing pile along the pipeline; the method comprises the steps that the monitoring devices are started in a timing and synchronous mode according to parameters set by the monitoring devices, interference corrosion signals on a pipeline are monitored in a timing and synchronous mode, namely an MCU is used for controlling an Alternating Current (AC) and Direct Current (DC) potential acquisition circuit to alternately convert and acquire the AC and DC interference signals, time-sharing measurement is achieved, and data are stored in a memory according to a format specified by a protocol; in the real-time monitoring process, the real-time collected data is read, and time-voltage curve drawing is carried out on a display screen of the monitoring device.
The on-line communication between the MCU on the monitoring device and the special computer system is realized, and the parameter setting and data transmission of the instrument are realized by using the MCU: the single chip computer serial communication interface on the monitoring device is connected with a special computer system through an RS-232C communication cable, and the acquired data is transmitted to the special computer system; the communication of the dedicated computer system with the monitoring device includes all portions of the dedicated computer system that need to be online with the monitoring device. First, the operating parameters of the monitoring device need to be set by a dedicated computer system. Secondly, all data of the monitoring device are transmitted to the special computer system, and all data to be processed by the special computer system come from the monitoring device, so the communication mode is the key for connecting the monitoring device and the special computer system. The problems of transmission modes of the two parties, transmission data correctness checking and the like need to be solved in the whole communication process. The communication between the monitoring device and the special computer system is realized in an asynchronous communication mode through a full-duplex serial port in the single chip microcomputer. Because the special computer system and the monitoring device carry out a lot of communication operations, both sides must carry out a common communication protocol for planning in order to know the information meaning of the data transmitted by the other side, and only then can know the meaning of the data transmitted by the other side to the other side. The dedicated computer system and the monitoring device can only achieve correct transmission of data with each other by jointly following a communication protocol. The communication protocol mainly comprises: the monitoring device comprises an online protocol, a setting word protocol of a special computer system to the monitoring device, a data transmission word protocol of the special computer system to the monitoring device, a protocol of the special computer system for requiring the monitoring device to clear a data storage area, a communication protocol of the special computer system for requiring the monitoring device to transmit voltage data monitored in real time, and a clock protocol of the special computer system for requiring the monitoring device to obtain.
And (3) finishing the processing, analysis and evaluation of the acquired data by using data processing software of a special computer system: the special computer system processes and analyzes the stored data, and evaluates the interference and corrosion condition of the buried pipeline, and gives results in the form of data tables and texts. The data processing of the special computer system comprises the steps that the special computer system receives the data transmitted by the monitoring device, converts the data format and stores the data, and monitors, traces the data curve, analyzes, counts and prints the data in real time. The key technology of software design is to utilize the principle of an expert system to solve the statistics and evaluation of data, and provide reliable scientific basis for whether the tested pipeline needs to take anticorrosion measures and what anticorrosion measures are taken, so as to ensure the safe and effective operation of the underground pipeline. The software handling problem is mainly based on the following parameters: (1) parameters specified in national standards; (2) the material and size of the pipeline; (3) chemical composition of soil, etc. The parameters are input to a computer in the form of input options, and the computer combines the measurement data, and provides accurate evaluation information of the interference corrosion condition of the buried pipeline through calculation, statistics, logical judgment and reasoning. Meanwhile, the corrosion potential curve is drawn according to the time corresponding relation of the multipoint synchronous monitoring data, so that the source of the interference corrosion signal can be judged.
Claims (10)
1. An automatic monitoring and evaluating system for interference corrosion of buried metal pipelines, comprising: buried metal pipeline interference corrosion automatic monitoring device and special computer system, its characterized in that: the automatic monitoring device is a monitoring device which can work independently, and realizes automatic timing starting, multipoint synchronous measurement, data acquisition and recording and communication with a special computer system; the special computer system is communicated with the automatic monitoring device to complete the setting and data reading of the automatic monitoring device; the collected data are analyzed and evaluated through a special computer system, and an evaluation result is output in the form of a chart, a curve and a text, so that whether the buried metal pipeline is threatened by interference corrosion or not and the degree of the threatened by the interference corrosion are rapidly evaluated.
2. The automatic disturbance corrosion monitoring and evaluation system for buried metal pipelines according to claim 1, wherein: the automatic monitoring device can monitor alternating current interference signals and direct current interference signals simultaneously, the alternating current interference signals and the direct current interference signals are processed by the alternating current signal conversion circuit and the direct current signal conversion circuit respectively and then are sent to the MCU through the acquisition switch circuit, the real-time clock chip and the NVRAM chip are hung on a data bus of the MCU, and the MCU is expanded with an RS232 serial interface circuit and used for communicating with a special computer system.
3. The automatic disturbance corrosion monitoring and evaluation system for buried metal pipelines according to claim 2, wherein: the direct current signal conversion circuit converts direct current interference signals from the copper sulfate reference electrode and the buried metal pipeline test pile into appropriate measurement voltage; r05, R06 and R07 form a voltage division circuit, C04 bypasses high-frequency interference, D3 and D4 are amplitude limiting devices, and R08 is a matching resistor which sends signal voltage to a next-stage circuit.
4. An automated disturbance corrosion monitoring and assessment system for buried metal pipelines according to claim 3, wherein: the monitoring range of the direct current interference signal is-20 to +20V, and the measurement precision is 0.001V.
5. The automatic disturbance corrosion monitoring and evaluation system for buried metal pipelines according to claim 2, wherein: the alternating current signal conversion circuit converts alternating current interference signals from the copper sulfate reference electrode and the buried metal pipeline test pile into proper measurement voltage; c01 is a direct current blocking capacitor, R01, R02 and R03 form a voltage division circuit, C02, C03 and C05 bypass high-frequency interference, D1 and D2 are amplitude limiting devices, R04 is matched with a resistor, AD736 is an alternating current true effective value conversion circuit, and C06, C07 and C08 are peripheral devices required by the AD736 in work; the signal voltage is output from the 6 th pin of the AD 736.
6. The automatic disturbance corrosion monitoring and evaluation system for buried metal pipelines according to claim 5, wherein: the monitoring range of the alternating current interference signal is 0-200V, and the measurement precision is 0.01V
7. The automatic disturbance corrosion monitoring and evaluation system for buried metal pipelines according to claim 1, wherein: the special computer system is composed of a PC and a written program and is divided into two parts: (1) measurement: before measurement, parameter setting is carried out on each monitoring device, and after measurement, data stored in the monitoring devices in a data file mode are read by a special computer system; (2) evaluation: the data are rapidly analyzed and evaluated mainly according to the interference equivalent corrosion voltage and the intensity spectrum, and an evaluation result is output.
8. The automatic disturbance corrosion monitoring and evaluation system for buried metal pipelines according to claim 7, wherein: the parameter setting items are as follows: instrument number, test date, measurement start time, measurement duration, measurement pile number, measurement mode and communication rate.
9. An automated disturbance corrosion monitoring and assessment system for buried metal pipelines according to claim 7, wherein: and the evaluation is to display a data table, a corrosion potential curve and an intensity spectrogram on a screen of a computer, and print and output the data table, the corrosion potential curve and the intensity spectrogram and the evaluation conclusion text by a printer.
10. An automated disturbance corrosion monitoring and assessment system for buried metal pipelines according to claim 9, wherein: the corrosion potential curve is drawn according to the time corresponding relation of the multipoint synchronous monitoring data, and an important basis is provided for judging the generation reason of the interference corrosion signal.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100449199C (en) * | 2006-08-30 | 2009-01-07 | 姬文超 | In-service pipeline corrosion and leakage safety monitoring and early warning system and control method thereof |
| CN101865817A (en) * | 2010-06-08 | 2010-10-20 | 天津大学 | Sensor and detection method for detecting corrosion of buried metal |
| CN103615662A (en) * | 2013-11-20 | 2014-03-05 | 中国石油天然气集团公司 | Method for determining nearly-neutral pH value stress corrosion cracking sensitive section of pipeline |
| CN107167419A (en) * | 2017-05-26 | 2017-09-15 | 成都润泰茂成科技有限公司 | A kind of buried pipeline external anti-corrosion layer on-line checking assessment system |
| CN107389782A (en) * | 2017-06-29 | 2017-11-24 | 清华大学 | Spiral nonmagnetic matrix high accuracy imaging detection device for the detection of pipeline tiny flaw |
| CN114167255A (en) * | 2021-11-17 | 2022-03-11 | 中车工业研究院有限公司 | Integrated circuit salt spray corrosion reliability test device and control method |
| CN114325469A (en) * | 2021-12-14 | 2022-04-12 | 国网江西省电力有限公司电力科学研究院 | Grounding grid direct current interference corrosion monitoring system |
| CN115219823A (en) * | 2022-07-15 | 2022-10-21 | 北京市燃气集团有限责任公司 | Multi-point synchronous monitoring and analyzing method and device for pipeline interfered by railway dynamic alternating current |
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| CN1003808B (en) * | 1986-04-28 | 1989-04-05 | 厦门大学 | Scanner for testing micro zone corrosion electric potential current density distribution |
| CN1062207A (en) * | 1991-12-26 | 1992-06-24 | 四川久大盐业(集团)公司 | Anti-corrosion electric transmitted-high pressure flow meter |
| NO308630B1 (en) * | 1996-09-19 | 2000-10-02 | Norske Stats Oljeselskap | Pipeline inspection system |
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| CN100449199C (en) * | 2006-08-30 | 2009-01-07 | 姬文超 | In-service pipeline corrosion and leakage safety monitoring and early warning system and control method thereof |
| CN101865817A (en) * | 2010-06-08 | 2010-10-20 | 天津大学 | Sensor and detection method for detecting corrosion of buried metal |
| CN101865817B (en) * | 2010-06-08 | 2011-12-14 | 天津大学 | Sensor and detection method for detecting corrosion of buried metal |
| CN103615662A (en) * | 2013-11-20 | 2014-03-05 | 中国石油天然气集团公司 | Method for determining nearly-neutral pH value stress corrosion cracking sensitive section of pipeline |
| CN103615662B (en) * | 2013-11-20 | 2016-07-06 | 中国石油天然气集团公司 | A kind of method determining pipeline near neutral pH stress corrosion cracking sensitivity section |
| CN107167419A (en) * | 2017-05-26 | 2017-09-15 | 成都润泰茂成科技有限公司 | A kind of buried pipeline external anti-corrosion layer on-line checking assessment system |
| CN107389782A (en) * | 2017-06-29 | 2017-11-24 | 清华大学 | Spiral nonmagnetic matrix high accuracy imaging detection device for the detection of pipeline tiny flaw |
| CN114167255A (en) * | 2021-11-17 | 2022-03-11 | 中车工业研究院有限公司 | Integrated circuit salt spray corrosion reliability test device and control method |
| CN114325469A (en) * | 2021-12-14 | 2022-04-12 | 国网江西省电力有限公司电力科学研究院 | Grounding grid direct current interference corrosion monitoring system |
| CN115219823A (en) * | 2022-07-15 | 2022-10-21 | 北京市燃气集团有限责任公司 | Multi-point synchronous monitoring and analyzing method and device for pipeline interfered by railway dynamic alternating current |
| CN115219823B (en) * | 2022-07-15 | 2024-01-30 | 北京市燃气集团有限责任公司 | Pipeline multipoint synchronous monitoring analysis method and device under railway dynamic alternating current interference |
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