CN117250389A - Stray current analysis early warning working method - Google Patents
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- CN117250389A CN117250389A CN202310954346.4A CN202310954346A CN117250389A CN 117250389 A CN117250389 A CN 117250389A CN 202310954346 A CN202310954346 A CN 202310954346A CN 117250389 A CN117250389 A CN 117250389A
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- 238000004088 simulation Methods 0.000 claims abstract description 17
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- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004210 cathodic protection Methods 0.000 description 4
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a stray current analysis early warning working method, which comprises the following steps: s1, arranging a cathode protection device between parallel pipelines, and installing a detection pile; s2, obtaining a corresponding incidence matrix through calculation, obtaining a corresponding decoupling matrix through processing and calculation of the incidence matrix, and obtaining a matrix of the first pipeline stray current and a matrix of the second pipeline stray current through processing of the decoupling matrix; s3, a simulation calibration module is arranged in the system, and error calculation is carried out through the simulation calibration module to obtain corrected matrix data of the stray current; s4, screening out a pivot point which is close to the damaged part of the insulating layer; s5, calculating the specific damage positions of the insulating layers of the first pipeline and the second pipeline, and finishing the positions into specific early warning data through a system to control the early warning device to send out early warning signals. The invention has the beneficial effects that: the specific damage positions of the insulating layers are determined, so that workers can more intuitively know which specific damage positions are shared, and check and repair the insulating layers one by one.
Description
Technical Field
The invention relates to pipeline safety inspection, in particular to a stray current analysis early warning working method.
Background
There are complex underground pipe burial at the urban floor. Where pipe corrosion is a troublesome problem in itself, corrosion sites need to be frequently detected and cathodically protected. However, due to the huge and complex underground pipeline system, there are necessarily parallel pipelines, and various problems will occur when the parallel pipelines are subjected to cathodic protection, if multiple power supplies are used for cathodic protection, the problems that the power supplies are too complex will occur, if the same power supply is used for cathodic protection of multiple pairs of parallel pipelines, the coupling condition will occur between the parallel pipelines, and the problems that the damage point of the insulating layer is difficult to determine will also occur, therefore, a working method for carrying out stray current analysis and early warning on the multiple pairs of parallel pipelines, which is convenient and accurate, is urgently needed.
Disclosure of Invention
The invention aims at least solving the technical problems in the prior art, and particularly creatively provides a stray current analysis and early warning working method, which comprises the following steps of:
s1, arranging a first detection pile, a second detection pile and a third detection pile between parallel pipelines to collect distribution data of stray current, wherein the first detection pile, the second detection pile and the third detection pile can input the detection data into an upper computer for processing, and control an early warning device to send early warning information after data processing;
s2, obtaining a first pipeline node voltage and a second pipeline node voltage through a first detection pile and a second detection pile, obtaining corresponding correlation matrixes through calculation, obtaining corresponding decoupling matrixes through processing calculation of the correlation matrixes, and obtaining a matrix of first pipeline stray currents and a matrix of second pipeline stray currents through processing of the decoupling matrixes;
s3, the upper computer is provided with a simulation calibration module, simulation data are provided in the module, error calculation is carried out on the simulation data and the matrix of the first pipeline stray current and the matrix of the second pipeline stray current obtained in the S2, and corrected matrix data of the stray current are obtained;
s4, the corrected matrix data of the stray current is combined with the correlation matrix C 1 And C 2 Carrying out feature selection in the neural network to obtain an MIV value, carrying out influence value calculation on the MIV value, and screening out a pivot point which is close to the damaged part of the insulating layer through comparison of the influence value and a preset threshold value;
s5, selecting an integral branch through the fulcrum obtained in the step S4, calculating the specific damaged positions of the insulating layers of the first pipeline and the second pipeline through the data measured by the first detection pile, the second detection pile and the third detection pile, and arranging the positions into early warning data through a system to control an early warning device to send early warning information.
As a preferred embodiment of the present invention, the calculation process of the decoupling matrix in S2 includes the following formula: ,
X＝C 2 AC 2 T +C 1 (G+Z) -1 C 1 T
x represents a decoupling matrix;
C 1 representing a protection power supply V E Correlation matrix between voltage of first pipeline node and C 1 T Then transpose it;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
C 2 representing a protection power supply V E Correlation matrix between the second pipeline node voltage and C 2 T Then transpose it;
a represents the inductance matrix of each branch.
As a preferred embodiment of the present invention, the calculation process of the matrix of the first pipe stray current and the matrix of the second pipe stray current in S2 includes the following formula:
V 1 a column vector representing a first pipeline node voltage;
H 1 a vector representing the stray current measured by the first test pile;
x represents a decoupling matrix;
V 2 a column vector representing a second pipeline node voltage;
H 2 a vector representing the stray current measured by the second test stake;
x represents a decoupling matrix;
Y 1 ＝V 1 ·(G+Z) -1 ，
Y 1 a matrix representing first pipe stray currents;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
V 1 a column vector representing a first pipeline node voltage;
Y 2 ＝V 2 ·(G+Z) -1 ，
Y 2 a matrix representing a second conduit stray current;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
V 2 a column vector representing the voltage of the second pipe node.
As a preferred embodiment of the present invention, the error calculation in S3 specifically includes the following formula:
U 1 representing a first pipe current error value;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
a simulation value representing an i-th pivot point of the first conduit inside;
a current value representing an ith pivot point in the first pipe stray current matrix;
U 2 representing a second pipe current error value;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
a simulation value representing an i-th pivot point of the second conduit;
representing the current value of the ith pivot point in the second pipe stray current matrix.
As a preferred embodiment of the present invention, the calculation of the closer fulcrum in S4 specifically includes the following formula:
a characteristic selection value representing an ith pivot point of the first conduit;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
representing the potential difference between two adjacent fulcrums in the first correlation matrix;
a characteristic selection value representing an ith pivot point of the first conduit;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
an influence value representing an ith pivot point of the first pipe;
a characteristic selection value representing an ith pivot point of the second conduit;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
representing the potential difference between two adjacent fulcrums in the second correlation matrix;
a characteristic selection value representing an ith pivot point of the second conduit;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
the impact value of the ith pivot point of the second pipe is represented.
As a preferable scheme of the present invention, the calculation formula of the specific damaged position of the insulating layer in step S5 is as follows:
a resistance value representing a broken insulating layer at an i-th fulcrum of the first pipe;
representing the current value at the i-th fulcrum of the first pipe;
representing the current value at the i+1th fulcrum of the first pipe;
representing the voltage value at the ith pivot point of the first conduit;
representing the voltage value of the third detection pile at the ith pivot point;
a resistance value representing a broken insulating layer at an i-th fulcrum of the second pipe;
representing the voltage value at the ith pivot point of the second conduit;
representing a broken insulating layer of the first pipe;
W 1 representing the insulation length of the first conduit;
absolute indicating breakage at the ith pivot point of the first conduitResistance value of the edge layer;
R 2 an insulation resistance value representing the first pipe;
representing a broken insulating layer of the second pipe;
W 2 representing the insulation length of the second conduit;
a resistance value representing a broken insulating layer at an i-th fulcrum of the second pipe;
R 3 representing the insulation resistance value of the second conduit.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows: 1. decoupling operation is carried out, and the signal interference problem between parallel tracks is solved; 2. the stray current data of multiple fulcrums are obtained, and the stray current data are matrixed to be convenient for centralized processing; 3. error correction is carried out on the obtained data of the stray current, so that the obtained data is more real and accurate; 4. the specific damage positions of the insulating layers are determined, and the integrated early warning data are processed to be reflected to the staff, so that the staff can more intuitively know the specific damage positions in common and check and repair one by one.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a schematic of the workflow of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in FIG. 2, the invention provides a stray current analysis and early warning working method, which specifically comprises the following steps: s1, arranging detection piles between parallel pipelines to collect distribution data of stray current, wherein E is an independent power supply for providing cathodic protection current, and the potential (voltage) is V as shown in FIG. 1 E The upper pipeline and the lower pipeline are parallel pipelines, R1 is the equal-section resistance of the first pipeline, R2 is the equal-section insulation layer resistance of the first pipeline, R3 is the equal-section insulation line resistance of the second pipeline, R4 is the equal-section resistance of the second pipeline, A1 is a first detection pile for detecting the voltage and the current at the node, B1 is a second detection pile for detecting the voltage and the current at the node, C1 is a second detection pile for mainly detecting the voltage and the current at the node, and along with the continuous extension of the parallel pipelines, the detection piles are increased and sequentially increased to Am, bm and Cm. The first detection pile, the second detection pile and the third detection pile can input detection data into the upper computer for processing, and the early warning device is controlled to send early warning information after the data processing. The early warning information is sent to a responsible person through a mobile phone number to be at the damaged position of the insulating layer, so that a worker can quickly decide.
S2, obtaining a first pipeline node voltage and a second pipeline node voltage through a first detection pile and a second detection pile, and obtaining a corresponding correlation matrix C through calculation 1 And C 2 The corresponding decoupling matrix is obtained by processing and calculating the association matrix, and the specific operation of the decoupling matrix is as follows:
X＝C 2 AC 2 T +C 1 (G+Z) -1 C 1 T
x represents a decoupling matrix;
C 1 representing a protection power supply V E Correlation matrix between voltage of first pipeline node and C 1 T Then transpose it;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
C 2 representing a protection power supply V E Correlation matrix between the second pipeline node voltage and C 2 T Then transpose it;
a represents the inductance matrix of each branch.
Decoupling matrices (Decoupling Matrix) are a common concept in the signal processing and communication arts. It is commonly used to address the problem of coupling and interference of signals between different channels or paths. In a multi-channel system or multi-antenna system, signals may be interfered by signals transmitted by other channels or antennas.
The decoupling matrix is mainly used for separating the coupling between the first pipeline and the second pipeline, so that independent processing of signals is realized. Through the decoupling matrix, decoupling and interference elimination can be carried out on signals, and system performance and signal quality are improved.
Measuring the vector of the stray current by the first detection pile and the second detection pile, and measuring the vector of the stray current by the stray current vector and the incidence matrix C 1 And C 2 Sequentially obtaining a column vector of the first pipeline node voltage and a column vector of the second pipeline node voltage, and finally obtaining a matrix of the first pipeline stray current and a matrix of the second pipeline stray current through calculation;
V 1 a column vector representing a first pipeline node voltage;
H 1 a vector representing the stray current measured by the first test pile;
x represents a decoupling matrix;
V 2 a column vector representing a second pipeline node voltage;
H 2 a vector representing the stray current measured by the second test stake;
x represents a decoupling matrix;
Y 1 ＝V 1 ·(G+Z) -1 ，
Y 1 a matrix representing first pipe stray currents;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
V 1 a column vector representing a first pipeline node voltage;
Y 2 ＝V 2 ·(G+Z) -1 ，
Y 2 a matrix representing a second conduit stray current;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
V 2 a column vector representing the voltage of the second pipe node.
If the insulating layer of pipeline has appeared the damage condition, will appear the condition of stray current loss, and each detection stake then can detect the damage, in order to can be through the more convenient centralized processing of host computer, output after matrixing its whole signal, early warning signal is more accurate.
S3, because of the burstiness and the instability of the stray current, a simulation calibration module is arranged in the upper computer, simulation data are arranged in the module, error calculation is carried out on the simulation data and the stray current data obtained by us, the data with obvious errors are removed, the step S2 is carried out again to obtain more accurate data, the following steps are avoided according to the wrong data, and the specific operation is as follows:
U 1 representing a first pipe current error value;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
a simulation value representing an i-th pivot point of the first conduit inside;
a current value representing an ith pivot point in the first pipe stray current matrix;
U 2 representing a second pipe current error value;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
a simulation value representing an i-th pivot point of the second conduit;
representing the current value of the ith pivot point in the second pipe stray current matrix.
Because the two different supporting points on the same branch are the same, n=m in total, the two pipelines are divided into two different pipelines, U 1 And U 2 If the error adjustment parameter is larger than the preset error adjustment parameter, the stray current matrix is represented to have obvious errors, the stray current matrix is obtained again according to the step S2, if the error adjustment parameter is smaller than the preset error adjustment parameter, the stray current matrix is represented to have no obvious errors, and the subsequent steps can be continued.
S4, associating the matrix of the first pipeline stray current and the matrix of the second pipeline stray current obtained after the correction in the step S3Matrix C 1 And C 2 Carrying out feature selection in the neural network to obtain an MIV value, then carrying out influence value calculation on the MIV value, screening out a supporting point through comparison of the influence value and a preset threshold value, and indicating that the closer the damaged part of the insulating layer is to the supporting point, the more the specific formula is as follows:
a characteristic selection value representing an ith pivot point of the first conduit;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
representing the potential difference between two adjacent fulcrums in the first correlation matrix;
a characteristic selection value representing an ith pivot point of the first conduit;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
an influence value representing an ith pivot point of the first pipe;
a characteristic selection value representing an ith pivot point of the second conduit;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
representing the potential difference between two adjacent fulcrums in the second correlation matrix;
a characteristic selection value representing an ith pivot point of the second conduit;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
an influence value representing an ith pivot point of the second pipe;
will beAnd->Both data are compared with a threshold value set in the system, and an influence value greater than the threshold value indicates that the insulating layer near the ith pivot point is broken, for example, < + >>This value greater than 0 indicates a problem of breakage of the insulation at the third pivot point of the first pipe.
S5, after the insulation layer is determined to be approximately damaged at a certain position through the step S4, for example, the position near a third pivot of the first pipeline is selected, the pivot of the second pipeline corresponding to the pivot is selected, the whole branch is selected, and the specific damaged position of the insulation layer of the first pipeline and the second pipeline is calculated through data measured by the first detection pile, the second detection pile and the third detection pile, wherein the specific formula is as follows:
a resistance value representing a broken insulating layer at an i-th fulcrum of the first pipe;
representing the current value at the i-th fulcrum of the first pipe;
representing the current value at the i+1th fulcrum of the first pipe;
representing the voltage value at the ith pivot point of the first conduit;
representing the voltage value of the third detection pile at the ith pivot point;
a resistance value representing a broken insulating layer at an i-th fulcrum of the second pipe;
representing the voltage value at the ith pivot point of the second conduit;
representing a broken insulating layer of the first pipe;
W 1 representing the insulation length of the first conduit;
a resistance value representing a broken insulating layer at an i-th fulcrum of the first pipe;
R 2 an insulation resistance value representing the first pipe;
representing a broken insulating layer of the second pipe;
W 2 representing the insulation length of the second conduit;
a resistance value representing a broken insulating layer at an i-th fulcrum of the second pipe;
R 3 representing the insulation resistance value of the second conduit.
After the position of a specific insulating layer of a specific fulcrum for stray current dissipation is calculated, the specific insulating layer is arranged into specific early warning data through a system, the specific early warning data are reflected to a man-machine interaction interface, and an early warning signal is sent out by controlling an early warning device at the same time, so that workers are reminded to reach a designated position through the data to check and repair the damaged position, and the subsequent possible safety accidents are avoided.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. The stray current analysis early warning working method is characterized by comprising the following steps of:
s1, arranging a first detection pile, a second detection pile and a third detection pile between parallel pipelines to collect distribution data of stray current, wherein the first detection pile, the second detection pile and the third detection pile can input the detection data into an upper computer for processing, and control an early warning device to send early warning information after data processing;
s2, obtaining a first pipeline node voltage and a second pipeline node voltage through a first detection pile and a second detection pile, obtaining corresponding correlation matrixes through calculation, obtaining corresponding decoupling matrixes through processing calculation of the correlation matrixes, and obtaining a matrix of first pipeline stray currents and a matrix of second pipeline stray currents through processing of the decoupling matrixes;
s3, the upper computer is provided with a simulation calibration module, simulation data are provided in the module, error calculation is carried out on the simulation data and the matrix of the first pipeline stray current and the matrix of the second pipeline stray current obtained in the S2, and corrected matrix data of the stray current are obtained;
s4, the corrected matrix data of the stray current is combined with the correlation matrix C 1 And C 2 Performing feature selection to obtain an MIV value, performing influence value calculation on the MIV value, and screening out the MIV value through comparison of the influence value and a preset threshold valueA fulcrum point which is closer to the broken part of the insulating layer;
s5, selecting an integral branch through the fulcrum obtained in the step S4, calculating the specific damaged positions of the insulating layers of the first pipeline and the second pipeline through the data measured by the first detection pile, the second detection pile and the third detection pile, and arranging the positions into early warning data through a system to control an early warning device to send early warning information.
2. The stray current analysis and early warning working method according to claim 1, wherein the calculation process of the decoupling matrix in S2 includes the following formula: ,
X＝C 2 AC 2 T +C 1 (G+Z) -1 C 1 T
x represents a decoupling matrix;
C 1 representing a protection power supply V E Correlation matrix between voltage of first pipeline node and C 1 T Then transpose it;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
C 2 representing a protection power supply V E Correlation matrix between the second pipeline node voltage and C 2 T Then transpose it;
a represents the inductance matrix of each branch.
3. The method of claim 1, wherein the calculating the matrix of the first pipeline stray current and the matrix of the second pipeline stray current in S2 includes the following formula:
V 1 a column vector representing a first pipeline node voltage;
H 1 a vector representing the stray current measured by the first test pile;
x represents a decoupling matrix;
V 2 a column vector representing a second pipeline node voltage;
H 2 a vector representing the stray current measured by the second test stake;
x represents a decoupling matrix;
Y 1 ＝V 1 ·(G+Z) -1 ，
Y 1 a matrix representing first pipe stray currents;
V 1 a column vector representing a first pipeline node voltage;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch;
Y 2 ＝V 2 ·(G+Z) -1 ，
Y 2 a matrix representing a second conduit stray current;
V 2 a column vector representing a second pipeline node voltage;
g represents a contact resistance matrix between pipelines;
z represents a matrix of mutual resistances between each branch.
4. The stray current analysis and early warning working method according to claim 1, wherein the error calculation in S3 specifically includes the following formula:
U 1 representing a first pipe current error value;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
a simulation value representing an i-th pivot point of the first conduit inside;
a current value representing an ith pivot point in the first pipe stray current matrix;
U 2 representing a second pipe current error value;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
a simulation value representing an i-th pivot point of the second conduit;
representing the current value of the ith pivot point in the second pipe stray current matrix.
5. The stray current analysis and early warning working method according to claim 1, wherein the calculation of the nearer fulcrum in S4 specifically includes the following formula:
a characteristic selection value representing an ith pivot point of the first conduit;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
representing the potential difference between two adjacent fulcrums in the first correlation matrix;
a characteristic selection value representing an ith pivot point of the first conduit;
i represents an i-th fulcrum;
m represents the number of first pipeline fulcrums;
an influence value representing an ith pivot point of the first pipe;
a characteristic selection value representing an ith pivot point of the second conduit;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
representing the potential difference between two adjacent fulcrums in the second correlation matrix;
a characteristic selection value representing an ith pivot point of the second conduit;
i represents an i-th fulcrum;
n represents the number of second pipeline fulcrums;
the impact value of the ith pivot point of the second pipe is represented.
6. The working method of the stray current analysis and early warning according to claim 1, wherein the calculation formula of the specific damaged position of the insulating layer in the step S5 is as follows:
a resistance value representing a broken insulating layer at an i-th fulcrum of the first pipe;
representing the current value at the i-th fulcrum of the first pipe;
representing the current value at the i+1th fulcrum of the first pipe;
representing the voltage value at the ith pivot point of the first conduit;
representing the voltage value of the third detection pile at the ith pivot point;
a resistance value representing a broken insulating layer at an i-th fulcrum of the second pipe;
representing the voltage value at the ith pivot point of the second conduit;
representing a broken insulating layer of the first pipe;
W 1 representing the insulation length of the first conduit;
representing a break at the ith pivot point of the first pipeResistance of the damaged insulating layer;
R 2 an insulation resistance value representing the first pipe;
representing a broken insulating layer of the second pipe;
W 2 representing the insulation length of the second conduit;
a resistance value representing a broken insulating layer at an i-th fulcrum of the second pipe;
R 3 representing the insulation resistance value of the second conduit.
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