CN110286083B - Comprehensive detection method for external corrosion - Google Patents
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Abstract
An external corrosion detection comprehensive measurement method comprises the following steps: the potentiostat inputs direct current to the pipeline through a first connecting cable, and a switch-on and switch-off device arranged on the first connecting cable is alternately switched on and off; the PCM transmitter inputs a plurality of alternating currents which have the frequency of 2 and are output by phase zero points to the pipeline through a second connecting cable; the PCM receiver detects the intensity of the alternating current on the pipeline; the direct current potential measuring equipment detects the potential difference between a pipeline connected with the direct current potential measuring equipment through a lead and the ground, and the detected potential difference is sent to the data acquisition terminal; the data acquisition terminal processes the alternating current data; the data acquisition terminal processes the direct current data; the comprehensive measurement method for external corrosion detection eliminates mutual interference between alternating current detection and direct current detection by controlling the frequency and the phase of current output of a PCM transmitter and selecting and processing the time point of potential current acquisition data, thereby realizing simultaneous PCM detection and DCVG detection.
Description
Technical Field
The invention belongs to the technical field of cathodic protection corrosion prevention, and particularly relates to an external corrosion comprehensive detection method.
Background
The mileage of in-service oil and gas pipelines is rapidly increased due to the rapid development of pipeline construction in China, and meanwhile, many existing-service buried pipelines in China are aged, the normal operation of the pipelines is seriously influenced due to the aging and corrosion of the pipelines, once an oil and gas conveying pipeline failure accident happens, the oil and gas conveying pipeline failure accident not only brings huge economic loss to production enterprises, but also can generate serious consequences to the society and the surrounding natural environment. The regular detection and evaluation of the pipeline anticorrosion protection system can timely and accurately grasp the corrosion state of the oil and gas transmission pipeline, and is important to ensure the safe operation of the oil and gas pipeline.
The external corrosion direct Evaluation (ECDA) technology is a method for evaluating the influence of external corrosion on the integrity of a pipeline, and a technical standard is formed at present. The ECDA acquires the current situation information of the corrosion and corrosion prevention system outside the pipeline through an external detection means according to a standardized program, and systematically and comprehensively evaluates the corrosion prevention system outside the pipeline by combining excavation verification and analysis results of related data. Weak links, external corrosion conditions and related influence factors of the pipeline external corrosion prevention system can be judged through the ECDA.
The current ECDA technical standard comprises four detection methods: 1. densometer potential measurement (CIPS); 2. direct current potential gradient method (DCVG); 3. alternating current attenuation (PCM); 4. alternating potential gradient method (ACVG). The device performing the DCVG/CIPS detection function is also commonly referred to as DCVG at present, the device performing the PCM/ACVG detection function is commonly referred to as PCM, and DCVG and PCM are the main detection devices for the corrosion detection outside the pipeline at present.
When two kinds of detection equipment of DCVG and PCM work at present, there are main problems in that: when ECDA detection is performed, PCM and DCVG interfere with each other and cannot be used simultaneously. When PCM is detected, the signal output by the transmitter contains alternating current components with various frequencies, and the accuracy of DCVG potential detection is influenced. In order to ensure the quality of engineering detection, the common method in engineering is to separately detect the PCM and the DCVG, so that the detection work of the same pipeline must be performed twice, the cost is high, and the efficiency is low.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an external corrosion comprehensive detection method which can enable PCM and DCVG to be used simultaneously.
In order to achieve the purpose, the invention adopts the technical scheme that:
an external corrosion detection comprehensive measurement method comprises the following steps:
the constant potential rectifier inputs direct current to the pipeline through a first connecting cable, a switch-on and switch-off device arranged on the first connecting cable is switched on and off alternately, and the switching-on duration time is T1The turn-off durations are all T2；
Inputting a plurality of alternating currents which are 2 in power of N Hz and are all output by a phase zero point into the pipeline by the PCM transmitter through a second connecting cable, wherein N is a positive integer;
the PCM receiver detects the alternating current intensity on the pipeline, and detected alternating current intensity data are sent to the data acquisition terminal;
the direct current potential measuring equipment detects the potential difference between a pipeline connected with the direct current potential measuring equipment through a lead and the ground, and the detected potential difference is sent to the data acquisition terminal;
the data acquisition terminal processes the alternating current data:
the data acquisition terminal continuously records the received alternating current intensity, removes the alternating current intensity data in the turn-off time period of the on-off device, and stores the rest alternating current intensity data which are spliced into a memory arranged in the data acquisition terminal as alternating current detection data;
the data acquisition terminal processes the direct flow data:
and the data acquisition terminal stores the potential difference when the current output of the PCM transmitter is at the phase zero point and the on-off device is switched on or switched off into the memory as power-on potential detection data and power-off potential detection data respectively.
Preferably, the PCM transmitter and the data acquisition terminal are both connected with a satellite synchronous clock.
Preferably, the step of processing the direct-flow data by the data acquisition terminal is replaced by:
the data acquisition terminal continuously records the received potential difference to form a mixed potential curve;
the data acquisition terminal carries out alternating current and direct current filtering processing on the received potential difference to obtain an alternating current potential curve corresponding to alternating current components of each frequency in the potential difference;
data acquisition terminal based on the mixA resultant potential curve is obtained to obtain a first mixed potential V at the X moment in the switch-on period of the on-off deviceXAnd a second mixed potential V at the Y moment in the turn-off period of the on-off deviceY；
The data acquisition terminal obtains a first alternating current potential V corresponding to the X moment in the switch-on period of the on-off device according to the alternating current potential curve corresponding to each alternating current componentAC_XA second AC potential V corresponding to Y moment in the turn-off period of the on-off deviceAC_Y；
The data acquisition terminal converts all the first alternating current potentials V at the X moment into the first alternating current potentials V at the X momentAC_XAnd a second alternating potential V at all Y momentsAC_YAre all summed to obtain a first total alternating potential sigma (V)AC_X) And a second total alternating current potential sigma (V)AC_Y)；
The data acquisition terminal is used for acquiring a first mixed potential VXAnd a first total alternating potential ∑ (V)AC_X) Obtaining the electrified potential V at the X moment in the on-period of the on-off deviceON_X，VON_X＝VX-∑(VAC_X)；
The data acquisition terminal is used for acquiring the second mixed potential VYAnd a second total alternating current potential sigma (V)AC_Y) Obtaining the power-off potential V at the Y moment in the turn-off period of the on-off deviceOFF_Y，VOFF_Y＝VY-∑(VAC_Y)；
The data acquisition terminal will be electrified the electric potential VON_XAnd a power-off potential VOFF_YThe data are stored in a memory as power-on potential detection data and power-off potential detection data, respectively.
Preferably, the ac/dc filtering process is:
the data acquisition terminal carries out direct current filtering on the received potential difference, filters out direct current components in the potential difference, divides the potential difference into alternating current components with a plurality of frequencies through alternating voltage filtering, and continuously records the alternating current components with each frequency to form a corresponding alternating current potential curve.
Preferably, the ac/dc filtering process is:
and the data acquisition terminal obtains a mixed alternating current potential curve with the direct current component removed by using a mixed potential curve formed by the received potential difference through an analog filtering algorithm or a digital filtering algorithm, and then divides the mixed alternating current potential curve into alternating current potential curves corresponding to alternating current components of each frequency.
Compared with the prior art, the invention has the advantages and positive effects that:
the comprehensive measurement method for external corrosion detection eliminates mutual interference between alternating current detection and direct current detection by controlling the frequency and the phase of current output of a PCM transmitter and selecting and processing the time point of potential current acquisition data, thereby realizing simultaneous PCM detection and DCVG detection.
By removing the alternating current intensity data measured in the on-off period of the on-off device and retaining and splicing the alternating current intensity detected in the on-off period of the on-off device, the alternating current intensity data in the final alternating current detection data are all measured when the potentiostat and the pipeline are electrified, namely the alternating current intensity on the pipeline is measured when the pipeline is in a cathode protection state, so that the obtained alternating current monitoring data are more accurate, and the interference of direct current on the alternating current monitoring data is eliminated.
The power-on potential and the power-off potential are collected when the alternating current sent by the PCM transmitter is positioned at the phase zero point, so that the interference of the alternating voltage to the direct current potential detection is eliminated, the removal processing of the alternating voltage interference is not needed, the accurate direct current potential can be quickly measured, the detection efficiency is improved, and the PCM detection and the DCVG detection can be carried out simultaneously.
The frequency of a plurality of alternating currents transmitted by the PCM transmitter is 2 Nth power Hz, and the alternating currents are all output by phase zero points, so that all the alternating currents can be at the phase zero points at a certain moment, and the direct current potential detection of the phase zero points is realized.
The PCM transmitter and the data acquisition terminal are connected with the satellite synchronous clock, and the alternating current output by the PCM transmitter starts from the phase zero point, so that the data acquisition terminal can determine the time of the phase zero point of the alternating current potential, and further accurately find the time of the phase zero point of the alternating current potential when the potentiostat is powered on and powered off, thereby ensuring that the power-on potential and the power-off potential when the alternating current voltage interference is zero can be accurately obtained.
When the power-on electric potential and the power-off electric potential are collected at a non-phase zero point, through the processing of direct current filtering and alternating current filtering, alternating current components of each frequency in the electric potential difference can be obtained, the electric potential of each frequency alternating current component at the same moment is obtained, the size of alternating current voltage interference is obtained, difference operation is carried out with the directly collected electric potential difference, accurate direct current electric potential can be obtained, removal of alternating current interference is achieved, under the condition that PCM detection and DCVG detection are carried out simultaneously, the direct current electric potential can be collected at any time, the obtained direct current electric potential is accurate, the detection flexibility is improved, and the detection accuracy is guaranteed.
Drawings
FIG. 1 is a system diagram of the apparatus used in the comprehensive measurement method for external corrosion detection according to the present invention;
in the above figures: 1. a pipeline; 2. testing the pile; 31. a PCM transmitter; 32. a PCM receiver; 41. a direct current potential measuring device; 42. a reference electrode; 5. a potentiostat; 6. an on-off device; 7. and a data acquisition terminal.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in FIG. 1, the comprehensive measurement method for external corrosion detection adopts PCM detection equipment and DCVG detection equipment.
The PCM detection device comprises a PCM transmitter 31 and a PCM receiver 32.
The PCM transmitter 31 is connected to the pipe 1 directly by a cable or by connecting the test pile 2 connected to the pipe 1 such that the PCM transmitter 31 is connected to the pipe 1, and the PCM transmitter 31 can input an alternating current to the pipe 1. The PCM receiver 22 is capable of sensing the magnetic field formed on the pipe 1 by the ac current, thereby measuring the magnitude of the ac current on the pipe 1.
The DCVG device comprises a dc potential measuring device 41. The direct current potential measuring device 41 is provided with two electrodes, one electrode is connected with the pipeline 1, the other electrode is connected with a reference electrode 42 used for grounding, and the direct current potential measuring device 41 detects the direct current potential of the pipeline 1 by detecting the voltage difference between the ground of the pipeline.
The potentiostat 5 is connected with the pipeline 1 through a first connecting cable, and inputs direct current to the pipeline 1 to form cathode protection on the pipeline 1. And an on-off device 6 is arranged on the first connecting cable, and can control the on-off between the potentiostat 5 and the pipeline 1.
When the constant potential rectifier 5 is connected and conducted with the pipeline 1, the constant potential rectifier 5 energizes the pipeline, and the detected voltage difference between the pipe grounds is an energizing potential; when the constant potential rectifier 5 is disconnected from the pipeline 1, the constant potential rectifier 5 stops electrifying the pipeline 1, and the detected voltage difference between the pipelines and the ground is the outage potential.
The on-off device 6 is alternately switched on and off, the on-time being T1The turn-off durations are all T2The on-off device 6 is operated at a fixed cycle.
The PCM transmitter 31 inputs a mixed alternating current of various frequencies to the pipe 1 through the second connection cable, the frequencies of the alternating currents are all N-th power hertz of 2, and the alternating currents are all output from the phase zero point, so that all the alternating currents can be at the phase zero point at a certain same time, and N is a positive integer.
The PCM receiver 32 detects the ac current intensity on the pipeline 1, and the detected ac current intensity data is transmitted to the data acquisition terminal 7.
The direct current potential measuring device 41 detects the potential difference between the pipeline 1 connected with the direct current potential measuring device through a lead and the ground, and the detected potential difference is sent to the data acquisition terminal 7.
The data acquisition terminal 7 can be an electronic device capable of recording and processing data, such as a mobile phone and a computer which are held by a tester.
The data acquisition terminal 7 processes the alternating current data:
and a data processing unit arranged on the data acquisition terminal 7 continuously records the received alternating current intensity data, meanwhile, a part of the recorded result in the turn-off time period of the on-off device 6 is removed, the rest part is spliced, an alternating current intensity curve is generated, and the alternating current intensity curve is stored in a memory arranged on the data acquisition terminal 7.
And after the pipeline detection is finished, sending the alternating current intensity curve stored in the memory into analysis equipment for analysis and processing to realize PCM/ACVG detection.
The data acquisition terminal 7 processes the direct flow data:
the data acquisition terminal 7 stores the potential difference detected when the current output of the PCM transmitter 31 is at the phase zero point in the on-period of the on-off device 6 as the power-on potential data into the memory; the data acquisition terminal 7 stores the potential difference detected when the current output of the PCM transmitter 31 is at the phase zero point in the turn-off period of the on-off device 6, as power-off potential data, into the memory.
And after the pipeline detection is finished, the power-on potential data and the power-off potential data stored in the memory are sent to analysis equipment for analysis and processing, so that the DCVG/CIPS detection is realized.
In order to enable the data acquisition terminal 7 to know the time when the alternating current output by the PCM transmitter 31 is at the phase zero point, the PCM transmitter 31 and the data acquisition terminal 7 are both connected to a satellite synchronous clock.
Since the PCM transmitter 31 outputs a mixed alternating current obtained by mixing alternating currents of a plurality of frequencies, the alternating current component of each frequency in the mixed alternating current is a sine wave alternating current and is output from the phase zero point, and the frequency of the alternating current component of each frequency is known. Therefore, in the operation clock of the PCM transmitter 31, the phase zero point time of the alternating current component of each frequency can be known from the start time and the frequency of the output thereof, and further, the phase zero point time of the mixed alternating current can be known from the time when each alternating current is located at the phase zero point.
Through the satellite synchronous clock, the PCM transmitter 31 and the data acquisition terminal 7 operate according to the same clock time, so that the data acquisition terminal 7 can acquire the time of the mixed alternating current at the phase zero point through the same operation clock as the PCM transmitter 31, and accurately acquire the power-on potential and the power-off potential.
When the collection of the power-on potential and the power-off potential is located at other moments except the zero moment of the phase of the mixed alternating current, the direct current data processing of the data collection terminal 7 adopts another processing mode, and the specific processing mode is as follows:
take the example of the PCM transmitter 31 outputting ac currents with three frequencies, 4Hz, 8Hz and 128Hz respectively.
And the data acquisition terminal 7 continuously records the received potential difference to form a mixed potential curve.
Since the on-off device 6 and the PCM transmitter 31 work simultaneously, a direct current and an alternating current exist on the pipeline 1 at the same time, so that the potential difference collected by the direct current potential measuring device 41 comprises a direct current component formed by the direct current and an alternating current component formed by the alternating current.
The mixed potential curve is formed by combining a direct current component and a plurality of alternating current components.
And the data acquisition terminal 7 performs alternating current and direct current filtering processing on the received potential difference to obtain an alternating current potential curve corresponding to the alternating current component of each frequency in the potential difference.
The AC/DC filtering treatment can adopt the following implementation modes:
the first embodiment is as follows:
the data acquisition terminal 7 performs direct current filtering on the received potential difference through a capacitor, and filters out direct current components in the received potential difference to obtain a mixed alternating current potential difference containing multiple frequency alternating current components, namely the mixed alternating current potential difference is formed by the combined action of alternating current with the frequency of 4Hz, alternating current with the frequency of 8Hz and alternating current with the frequency of 128 Hz.
And the data acquisition terminal 7 performs alternating current filtering on the mixed alternating current potential difference according to the frequency of the alternating current sent by the PCM transmitter 31, and splits the mixed alternating current potential difference according to the frequency.
The data acquisition terminal 7 filters the alternating voltage of 4Hz and 8Hz in the mixed alternating current potential difference to obtain the alternating voltage of 128Hz, and the alternating voltage is continuously recorded to form a 128Hz alternating current potential curve; filtering out 8Hz and 128Hz alternating current voltages in the mixed alternating current potential difference to obtain 4Hz alternating current voltage, and continuously recording the alternating current voltage to form a 4Hz alternating current potential curve; and filtering the 4Hz and 128Hz alternating voltages in the mixed alternating current potential difference to obtain 8Hz alternating voltage, and continuously recording the 8Hz alternating voltage to form an 8Hz alternating current potential curve.
The data acquisition terminal 7 splits the mixed alternating current potential difference according to the above manner to obtain a 4Hz alternating current potential curve, an 8Hz alternating current potential curve and a 128Hz alternating current potential curve.
Example two:
the data acquisition terminal 9 obtains a mixed alternating current potential curve from which the direct current component is removed by continuously recording the received potential difference through an analog filtering algorithm or a digital filtering algorithm.
The mixed alternating current potential curve divides alternating current components in the mixed alternating current potential curve into alternating current potential curves corresponding to alternating current components of each frequency through an analog filtering algorithm or a digital filtering algorithm, so that a 4Hz alternating current potential curve, an 8Hz alternating current potential curve and a 128Hz alternating current potential curve are obtained
The analog filtering algorithm or the digital filtering algorithm is not an innovation point of the application, and the extraction of the direct current component and the splitting of the alternating current component of the mixed alternating current potential curve are performed in the prior art.
The data acquisition terminal 7 obtains a first mixed potential V at the X moment in the on-period of the on-off device 6 according to the mixed potential curveXAnd a second mixed potential V at the Y moment in the turn-off period of the on-off device 6Y。
The data acquisition terminal 7 obtains a first alternating current potential V generated by the action of the 4Hz alternating current at the X moment in the on-time of the on-off device 6 according to the 4Hz alternating current potential curveAC_X(4Hz)And by the action of an alternating current at 4Hz at the Y moment during the turn-off period of the on-off device 6A second alternating potential VAC_Y(4Hz)。
The data acquisition terminal 7 obtains a first alternating current potential V generated by the action of 8Hz alternating current at the X moment within the connection time of the on-off device 6 according to the 8Hz alternating current potential curveAC_X(8Hz)And a second alternating potential V generated by the action of an alternating current of 8Hz at the Y moment in the turn-off period of the on-off device 6AC_Y(8Hz)。
The data acquisition terminal 7 obtains a first alternating current potential V generated by the action of the 128Hz alternating current at the X moment in the on-time of the on-off device 6 according to the 128Hz alternating current potential curveAC_X(128Hz)And a second alternating potential V generated by the action of a 128Hz alternating current at the Y time in the turn-off period of the on-off device 6AC_Y(128Hz)。
The data acquisition terminal 7 sums the first alternating current potentials at all times X and the second alternating current potentials at all times Y to obtain a first total alternating current potential sigma (V)AC_X) And a second total alternating current potential sigma (V)AC_Y) And the magnitude of the alternating current potential difference in the potential difference collected by the direct current potential measuring device 41 is obtained.
∑(VAC_X)＝VAC_X(4Hz)+VAC_X(8Hz)+VAC_X(128Hz)；
∑(VAC_Y)＝VAC_Y(4Hz)+VAC_Y(8Hz)+VAC_Y(128Hz)；
The data acquisition terminal 7 is used for acquiring a first mixed potential VXAnd a first total alternating potential ∑ (V)AC_X) To obtain the energizing potential V at the X time in the on period of the on-off device 6ON_X，VON_X＝VX-∑(VAC_X) Therefore, the interference of the potential difference generated by the alternating current on the detection result of the electrified potential is eliminated, and the accurate electrified potential is obtained.
The data acquisition terminal 7 is used for acquiring the second mixed potential VYAnd a second total alternating current potential sigma (V)AC_Y) To obtain the power-off potential V at the Y moment in the turn-off period of the on-off device 6OFF_Y，VOFF_Y＝VY-∑(VAC_Y) Therefore, the interference of the potential difference generated by the alternating current on the detection result of the power-off potential is eliminated, and the accurate power-off potential is obtained.
The data acquisition terminal 7 will energize the potential VON_XAnd a power-off potential VOFF_YThe data are stored in a memory as power-on potential detection data and power-off potential detection data, respectively.
And after the pipeline detection is finished, the power-on potential data and the power-off potential data stored in the memory are sent to analysis equipment for analysis and processing, so that the DCVG/CIPS detection is realized.
The alternating current potential curve corresponding to each frequency alternating current component is obtained in a filtering mode, and data delay exists in filtering processing. In order to avoid errors in the potential values obtained on the alternating current potential curve at the X moment and the Y moment due to data delay, the alternating current potential curve needs to be subjected to delay correction.
The time delay correction of the alternating current potential curve can align the starting time point of the alternating current potential curve with the starting time point of the running of the PCM transmitter through a synchronous running clock to obtain the accurate alternating current potential curve of the running clock; because the effective voltage value of the alternating current component is fixed, the effective voltage value can be obtained according to the area of the waveform of the alternating current potential curve before correction, and then the alternating current potential curve of the initial time point and the PCM transmitter is inversely calculated according to the effective voltage value and the initial time point of the PCM transmitter, so that the accurate alternating current potential curve of the running clock is obtained.
The processing method of the time delay correction of the alternating current potential curve is the prior art and is not the innovation point of the application.
Claims (5)
1. The comprehensive measurement method for the external corrosion detection is characterized by comprising the following steps:
the constant potential rectifier inputs direct current to the pipeline through a first connecting cable, a switch-on and switch-off device arranged on the first connecting cable is switched on and off alternately, and the switching-on duration time is T1The turn-off durations are all T2；
The PCM transmitter inputs a plurality of alternating currents which are 2 in power of N and are output by phase zero points to the pipeline through a second connecting cable at the same time, wherein N is a positive integer;
the PCM receiver detects the alternating current intensity on the pipeline, and detected alternating current intensity data are sent to the data acquisition terminal;
the direct current potential measuring equipment detects the potential difference between a pipeline connected with the direct current potential measuring equipment through a lead and the ground, and the detected potential difference is sent to the data acquisition terminal;
the data acquisition terminal processes the alternating current data:
the data acquisition terminal continuously records the received alternating current intensity data, removes the alternating current intensity data in the turn-off time period of the on-off device, and stores the rest alternating current intensity data which are spliced into a memory arranged in the data acquisition terminal as alternating current detection data;
the data acquisition terminal processes the direct flow data:
and the data acquisition terminal stores the potential difference when the current output of the PCM transmitter is at the phase zero point and the on-off device is switched on or switched off into the memory as power-on potential detection data and power-off potential detection data respectively.
2. The comprehensive measurement method for external corrosion detection according to claim 1, wherein the PCM transmitter and the data acquisition terminal are connected to a satellite synchronous clock.
3. The comprehensive measurement method for detecting the external corrosion according to claim 1, wherein the processing steps of the direct current data by the data acquisition terminal are replaced by:
the data acquisition terminal continuously records the received potential difference to form a mixed potential curve;
the data acquisition terminal carries out alternating current and direct current filtering processing on the received potential difference to obtain an alternating current potential curve corresponding to alternating current components of each frequency in the potential difference;
the data acquisition terminal obtains a first mixed potential V at the X moment in the switch-on period of the on-off device according to the mixed potential curveXAnd a second mixed potential V at the Y moment in the turn-off period of the on-off deviceY；
The data acquisition terminal corresponding to the AC component of each frequencyObtaining a first alternating current potential V corresponding to the X moment in the switch-on period of the on-off device by using an alternating current potential curveAC_XA second AC potential V corresponding to Y moment in the turn-off period of the on-off deviceAC_Y；
The data acquisition terminal converts all the first alternating current potentials V at the X moment into the first alternating current potentials V at the X momentAC_XAnd a second alternating potential V at all Y momentsAC_YAre all summed to obtain a first total alternating potential sigma (V)AC_X) And a second total alternating current potential sigma (V)AC_Y)；
The data acquisition terminal is used for acquiring a first mixed potential VXAnd a first total alternating potential ∑ (V)AC_X) Obtaining the electrified potential V at the X moment in the on-period of the on-off deviceON_X，VON_X＝VX-∑(VAC_X)；
The data acquisition terminal is used for acquiring the second mixed potential VYAnd a second total alternating current potential sigma (V)AC_Y) Obtaining the power-off potential V at the Y moment in the turn-off period of the on-off deviceOFF_Y，VOFF_Y＝VY-∑(VAC_Y)；
The data acquisition terminal will be electrified the electric potential VON_XAnd a power-off potential VOFF_YThe data are stored in a memory as power-on potential detection data and power-off potential detection data, respectively.
4. The comprehensive measurement method for external corrosion detection according to claim 3, wherein the AC/DC filtering process is:
the data acquisition terminal carries out direct current filtering on the received potential difference, filters out direct current components in the potential difference, divides the potential difference into alternating current components with a plurality of frequencies through alternating voltage filtering, and continuously records the alternating current components with each frequency to form a corresponding alternating current potential curve.
5. The comprehensive measurement method for external corrosion detection according to claim 3, wherein the AC/DC filtering process is:
and the data acquisition terminal obtains a mixed alternating current potential curve with the direct current component removed by using a mixed potential curve formed by the received potential difference through an analog filtering algorithm or a digital filtering algorithm, and then divides the mixed alternating current potential curve into alternating current potential curves corresponding to alternating current components of each frequency.
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