CN111830361B - Method for detecting corrosion fault of grounding grid of oil field tank field - Google Patents
Method for detecting corrosion fault of grounding grid of oil field tank field Download PDFInfo
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- CN111830361B CN111830361B CN201910315079.XA CN201910315079A CN111830361B CN 111830361 B CN111830361 B CN 111830361B CN 201910315079 A CN201910315079 A CN 201910315079A CN 111830361 B CN111830361 B CN 111830361B
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Abstract
The invention discloses a method for detecting corrosion faults of an earthing network of an oil field tank field, and belongs to the technical field of electric power system safety diagnosis devices. The technical scheme is as follows: a detection method for corrosion faults of an oil field tank field grounding grid is carried out by utilizing a corrosion fault detection device for the oil field tank field grounding grid, and comprises a measurement module, a data processing unit, a human-computer interaction module and a power supply unit; the data processing unit is used for receiving input information of the man-machine interaction unit, receiving measurement information of the measurement unit, converting the measurement information of the measurement unit into a measurement result, outputting the measurement result to the man-machine interaction module, calculating a corrosion fault result by using the received input information and the measurement information, and outputting the calculated corrosion fault result to the man-machine interaction module. The invention has the beneficial effects that: the method for detecting the corrosion fault of the grounding grid of the oil field tank field is convenient to carry, can meet the requirement of trenchless detection, and is high in precision, convenient and fast in measurement and data transmission and processing.
Description
Technical Field
The invention relates to the technical field of electric power system safety diagnosis devices, in particular to a method for detecting corrosion faults of an oil field tank field grounding grid.
Background
The grounding grid of the oil field tank field is a main channel for releasing lightning current, and is a basic measure for ensuring the lightning protection safety of the oil field tank field. If the grounding grid is corroded and broken seriously, the grounding resistance is increased, and the ground potential is distributed unevenly, the lightning current or the lightning static induction charge is discharged into the ground at a speed obviously reduced, spark discharge or high-potential counterattack is generated among metal accessories of the storage tank, and oil gas is ignited and detonated to cause serious safety accidents and loss. At present, the method for detecting the fault of the grounding grid mainly comprises excavation detection and non-excavation detection, wherein the method adopted for detecting the fault of the grounding grid in the oil field tank area is generally earth breaking excavation, the method cannot accurately judge the condition of the grounding grid, and after the ground grid grounding resistance is unqualified or an accident caused by the grounding grid occurs, the method for searching the break point and the corrosion section of the conductor of the grounding grid through large-area excavation has blindness and great workload, and also influences the safe operation of a power system. In addition, in the trenchless detection method, a resistance measuring device is generally adopted to directly measure the resistance at two ends of a resistance section, but the resistance value is not the true value of the resistance of the section, and a large error is generated. Because work for a long time in the open air, the measuring device is inside not to have the battery power supply, has electromagnetic interference around the grounding net, can not directly use the socket around the grounding net, needs to increase extra independent power supply. Meanwhile, when the measuring device is used for fault detection of the grounding grid of the oil field tank field, the contact resistance of the measuring port and the grounding down lead greatly affects the result of inverse operation of the branch resistance, so that how to reduce or eliminate the influence of the contact resistance is also an urgent problem to be solved in the fault non-excavation detection of the grounding grid of the oil field tank field.
In the existing transformer substation grounding grid port resistance measuring instrument, direct measurement is usually carried out and then compared with a theoretical value, a measured value obtained by the measuring method is only an estimated value, and in the measurement, the measuring ports are usually far away from each other, so that the requirement on the length of a measuring wire is high, field wiring is long, time is consumed, and contact resistance in the measuring wire cannot be eliminated. And the data measured by the measuring instrument can not be directly transmitted to the data processing terminal, the data is manually recorded firstly and then is sequentially input into the terminal, and the process is complicated and is easy to make mistakes. At this time, if the method is applied to the corrosion detection of the grounding grid of the oil field tank field, the following problems can be brought:
one input directly takes a lot of time. And the input process is complicated, and the error caused by input cannot obtain the correct diagnosis result.
Secondly, the length of the test wire is usually 10-20 meters, which is equivalent to the length of the grounding down lead, so that the error of the self resistance of the test down lead on the detection result is very large, and the inaccuracy of the result is increased.
And thirdly, because the contact resistance is usually tens of milliohms, the grounding grid of the oil field tank area is usually not large, and the port resistance is also tens of milliohms, the influence of errors is large, and the result of the inverse operation of the branch resistance is far larger than the actual value.
How to solve the above technical problems is the subject of the present invention.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the method for detecting the corrosion fault of the grounding grid of the oil field tank area, which is portable, high in precision, convenient and quick to measure, and quick in data transmission and processing, can be widely applied to the detection of the corrosion fault of the grounding grid with various simple topological structures, and is particularly suitable for the corrosion fault measurement of the grounding grid of the large oil field tank area.
In order to achieve the purpose, the invention provides a fault detection device for an earth grid of an oil field tank field, which comprises a measurement module, a data processing unit, a human-computer interaction module and a power supply unit, wherein the measurement module is used for measuring the fault of the earth grid; wherein the data processing unit: the system comprises a man-machine interaction module, a corrosion fault calculation module and a corrosion fault calculation module, wherein the man-machine interaction module is used for receiving input information of the man-machine interaction module, receiving measurement information of the measurement unit, converting the measurement information of the measurement unit into a measurement result, outputting the measurement result to the man-machine interaction module, calculating a corrosion fault result by using the received input information and the measurement information, and outputting the calculated corrosion fault result to the man-machine interaction module;
the human-computer interaction module: the system comprises a first human-computer interaction unit for displaying measurement results and a second human-computer interaction unit for inputting information and displaying calculated corrosion fault results.
Further, the method for calculating the corrosion fault result in the data processing unit specifically comprises the following steps:
firstly, establishing mathematical equations before and after corrosion of a grounding grid conductor by utilizing the Taylor's theorem and a circuit principle;
secondly, the numerical value of the contact resistance is used as error correction, and a contact resistance error correction equation is established:
wherein, Δ RijThe port resistance of ij varies from the normal case,
the contact being the contact resistance, Δ RkIs the change in resistance of branch k from normal, IkFor corrosion of the current of the branch k before the fault, Ik' is the current of branch k after corrosion failure, I0The magnitude of the current applied between the ij ports;
and finally, carrying out numerical value iterative calculation by using a non-negative least square method to obtain a final calculation result, namely a multiple relation between the actual resistance and the resistance without corrosion, and displaying the result in a visual display mode, namely a diagnosis schematic diagram.
Furthermore, the measuring module comprises two groups of input units, namely a voltage input unit and a current input unit; and the measurement result of the measurement information of the measurement module converted by the data processing unit is a resistance value. The measuring module adopts high-precision direct current bridge measuring data and adopts software filtering to process and calculate the measuring signal; and filtering out measurement distortion caused by random interference by adopting a broadband interpolation algorithm.
Furthermore, each group of the input units is provided with two measuring poles which are respectively detachably provided with leads, wherein the two measuring poles of one group of the input units are current poles, and the two measuring poles of the other group of the input units are voltage poles.
Furthermore, the first human-computer interaction unit is arranged as a digital display tube and used for displaying the measured resistance value, so that an operator can visually judge whether the measurement is completed or not, and further the next operation is performed.
Furthermore, the second human-computer interaction unit is set as a touch display screen.
Still further, the power supply unit includes the lithium cell, the input with the output mutual electricity of lithium cell is connected, and the output is respectively the measuring module, the data processing unit and the dc-to-ac converter of human-computer interaction module power supply, and control the on & off key of lithium cell. The inverter is in the prior art, can convert direct current into 220V power frequency alternating current to supply power to the device, and is not described herein again.
Furthermore, an operating system of the single chip microcomputer with the built-in data processing unit is set as a windows operating system, or other operating systems which can run matlab and can process data of the measurement module at the same time.
The method for detecting the corrosion fault of the grounding grid of the oil field tank field by using the device for detecting the fault of the grounding grid of the oil field tank field comprises the following steps:
step S1: drawing a topological structure diagram according to a construction diagram of a tank field grounding grid, wherein the topological structure diagram takes a grounding grid down lead as a node and a connecting line of two connected nodes as a branch, and finally forms a topological structure diagram consisting of a plurality of circles and connecting lines between two adjacent circles;
step S2: combining the topological structure chart to carry out node numbering and branch numbering on the tank field grounding grid;
step S3: generating a correlation node matrix according to the node number and the branch number;
step S4: according to the topological structure diagram, a branch between two nodes is electrically connected by an auxiliary lead; then, sequentially measuring the resistance of each branch corresponding to the auxiliary lead, the contact resistance of each auxiliary lead and a down lead port of the grounding grid, and measuring the port resistance between adjacent nodes;
step S5: the corrosion fault detection program utilizes the measured resistance of the auxiliary lead, the contact resistance and the port resistance to calculate a multiple relation between the actual resistance and the resistance under the condition of no corrosion;
step S6: obtaining a corrosion detection result; in the diagnostic schematic of the corrosion fault detection program, the ring segments, which have levels of corrosion from no corrosion, light corrosion, moderate corrosion to severe corrosion, are blue, yellow, orange, and red in color, respectively.
Further, the detection means is adopted in the steps S3 to S6; the detection device is shaped as a cuboid, the touch display screen, the digital display tube, the four measuring electrodes and the on-off key are respectively arranged on the outer surface of the detection device, and the lithium battery, the inverter, the single chip microcomputer and the plurality of connecting data lines are accommodated in the detection device; the inverter is a TDK inverter, and the type number of the inverter is as follows: XAD001SR-3, the singlechip is 51 singlechips, and its model is: AT89S 51.
The single chip microcomputer is provided with a plurality of data interfaces, preferably, the data interfaces are set to be USB interfaces, the number of the data interfaces is set to be two, one of the data interfaces mutually transmits data with the measuring module through a USB-to-RS 232 serial port data line, and the other data interface is used for being connected with other equipment (such as equipment capable of modifying bug of a corrosion fault detection program).
The invention is characterized in that the appearance dimension specifications of the grounding grid fault detection device of the oil field tank field are respectively set as follows: 400mm-450mm, 300mm-380mm wide, 150mm-200mm high, the said touch display screen, the said digital display tube, four said measure pole and said on-off key are all set up on the top surface of the apparatus;
the distance between the touch display screen and the left boundary of the equipment is 15mm-18mm, and the distance between the touch display screen and the upper boundary is 30mm-40 mm;
the digital display tube is 15mm-24mm away from the display screen, 45mm-50mm away from the right side and 120mm-130mm away from the upper boundary;
the distance between the on-off key and the digital display tube on the left side is 10mm-20mm, and the distance between the on-off key and the digital display tube on the upper side is 70mm-80 mm;
the four measuring poles are positioned 18mm-21mm away from the right side and 50mm-60mm away from the upper side;
the four measuring poles are arranged in parallel to the right boundary, and the adjacent distance between four ends is 8-12 mm.
The invention is also characterized in that the appearance size specification of the single chip is set as follows: the length is 292-295mm, the width is 200-208mm, and the height is 4-15 mm;
the power supply module is arranged in the oil field tank area grounding grid fault detection device and clings to the lower inner wall, the external dimension specification of the lithium battery is set to be 205mm-215mm long, 115mm-125mm wide and 10mm-20mm high, the power output range is set to be 10V-20V, and the capacity is set to be 20000mAh-180000 mAh;
the lithium battery is arranged at the lower right part in the device, and the inverter is arranged at the position 50-60 mm away from the left side wall at the lower left part in the device;
the charging hole of the lithium battery is 100mm-110mm away from the right side boundary and 5mm-7mm away from the lower side boundary.
When the invention is actually used: the specific operation steps are as follows:
the method comprises the following steps: the device is connected: and installing an oil field tank field grounding grid fault detection device, opening a switch key, and starting to measure 30 minutes after the power supply is switched on. The lead wire is connected to the measuring electrode of the device (two voltage electrodes U)1,U2And two current poles I1,I2Voltage and current poles cannot be short-circuited, respectively).
Step two: initialization: and starting a corrosion fault detection program, and adjusting the data transmission baud rate to 4800bps at the data processing terminal. And (3) carrying out zero calibration on the equipment, firstly pressing an M key on the touch display screen, firstly pressing a corresponding range switch during calibration, then pressing a 0 key below a C panel, and adjusting a Z potentiometer of the front panel to display the number as 0. And resetting the switch after the calibration is finished.
Step three: setting parameters: and setting parameters of the grounding grid in a corrosion fault detection program, wherein the parameters comprise the annular number of the grounding grid, the number of grounding wires, the area of the grounding grid and a topological structure. And after the setting is finished, modifying the established model by the model of the grounding grid according to the actual condition of the grounding grid of the oil field tank field to obtain an actual grounding grid model. And inputting the theoretical resistivity and the length of the grounding grid into the corresponding module position of the corrosion fault detection program, and inputting the resistance and the contact resistance of the auxiliary lead into a correction module of the corrosion fault detection program.
Step four: measurement and transmission of data: after selecting proper measuring range, the measured ring section clicked on the display screen corresponding to the geonet section pops up a test attribute window, and a proper test port and the U of the geonet test line are selected1Terminal and I1The end is connected to one end of the ring section to be measured at the same time, U2Terminal and I2The end is connected with the other end of the tested ring section. After the reading is stable, clicking 'obtaining the measured resistance' on the attribute interface, transmitting and displaying the measured resistance value in the 'measured resistance' item in 3-10 seconds, and clicking a 'save' button. This operation is repeated until all the network segments have been measured.
Step five: data processing and diagnosis result display: and clicking a 'calculation' button on a diagnosis program interface to display a diagnosis result in the diagnosis schematic diagram. In the diagnostic schematic, the ring segments, which have a degree of corrosion ranging from no corrosion, slight corrosion, moderate corrosion to severe corrosion, are blue, yellow, orange and red in color, respectively. The actual resistance of each ring segment in the earth screen is shown in the diagnostic histogram as a multiple of the resistance without corrosion. And completing the trenchless detection of the corrosion fault of the grounding grid of the oil field tank field.
The invention has the beneficial effects that: after the technical scheme is adopted, the invention mainly has the following advantages:
(1) the application range is wide. The method can be used for measuring and diagnosing corrosion faults of various types of grounding grids. The invention can realize the accurate measurement of the corrosion fault of the grounding grid under the condition of not excavating the grounding grid, obviously reduce the measurement difficulty and the measurement time, break through the limitation that the traditional grounding grid corrosion experiment can only adopt an excavating method to observe the corrosion fault, and solve the technical problem that the corrosion fault of the grounding grid is difficult to simply and quickly measure in the prior engineering.
(2) The diagnosis result is accurate. The traditional method for determining the corrosion fault of the grounding grid by mining and observation is abandoned, the inaccuracy of a diagnosis result caused by observation is obviously reduced, accurate measurement data and a diagnosis result are provided, and the engineering technical problem that the accurate corrosion fault of the grounding grid is difficult to obtain in the corrosion fault of the large grounding grid is solved.
(3) The measuring equipment is portable. The total weight of the equipment is 4-10kg, a large amount of human resources can be saved, the connection between the sub-equipment and operators is simple and convenient, and the complexity of the use and the operation of the equipment is reduced.
(4) The battery has strong cruising ability, adopts a high-capacity lithium battery to supply power, has the power consumption of 10-18W, can be used for 60-100h once being fully charged, and can work for a long time under the condition of no external power supply outdoors.
(5) The measurement cost is reduced. The device has reasonable structural design and low cost compared with the traditional equipment; and can save a large amount of manpower, material resources, financial resources, can show and improve work efficiency, facilitate the popularization and application.
The invention can be widely applied to the conventional measurement work of corrosion faults of various grounding grids, and is particularly suitable for large-scale grounding grids and the situation that excavation measurement is difficult to carry out due to the influence of geographical environment.
Drawings
FIG. 1 is a schematic view of the present invention in use.
FIG. 2 is a schematic view of the structure of the instrument panel of the present invention.
FIG. 3 is a schematic view of the internal wiring structure of the apparatus of the present invention.
FIG. 4 is a schematic diagram of the detection principle of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
Referring to fig. 1 to 4, an embodiment of the present invention provides an oilfield tank field grounding grid fault detection apparatus, including a measurement module, a data processing unit, a human-computer interaction module, and a power supply unit; wherein the data processing unit: the system comprises a man-machine interaction module, a corrosion fault calculation module and a corrosion fault calculation module, wherein the man-machine interaction module is used for receiving input information of the man-machine interaction module, receiving measurement information of the measurement unit, converting the measurement information of the measurement unit into a measurement result, outputting the measurement result to the man-machine interaction module, calculating a corrosion fault result by using the received input information and the measurement information, and outputting the calculated corrosion fault result to the man-machine interaction module;
a human-computer interaction module: the system comprises a first human-computer interaction unit for displaying measurement results and a second human-computer interaction unit for inputting information and displaying calculated corrosion fault results.
Further, the method for calculating the corrosion fault result in the data processing unit specifically comprises the following steps:
firstly, establishing mathematical equations before and after corrosion of a grounding grid conductor by utilizing the Taylor's theorem and a circuit principle;
secondly, the numerical value of the contact resistance is used as error correction, and a contact resistance error correction equation is established:
wherein, Δ RijThe port resistance of ij varies from the normal case,
the contact being the contact resistance, Δ RkIs the change in resistance of branch k from normal, IkFor corrosion of the current of the branch k before the fault, Ik' is the current of branch k after corrosion failure, I0The magnitude of the current applied between the ij ports;
and finally, carrying out numerical value iterative calculation by using a non-negative least square method to obtain a final calculation result, namely a multiple relation between the actual resistance and the resistance without corrosion, and displaying the result in a visual display mode, namely a diagnosis schematic diagram.
Furthermore, the measuring module comprises two groups of input units, namely a voltage input unit and a current input unit; the measurement result of the measurement information of the measurement module after being converted by the data processing unit is a resistance value. The measuring module adopts high-precision direct current bridge measuring data and adopts software filtering to process and calculate the measuring signal; and filtering out measurement distortion caused by random interference by adopting a broadband interpolation algorithm.
Furthermore, each group of input units is provided with two measuring poles which are respectively detachably provided with leads, wherein the two measuring poles of one group of input units are current poles, and the two measuring poles of the other group of input units are voltage poles.
Furthermore, the first human-computer interaction unit is arranged as a digital display tube and used for displaying the measured resistance value.
Furthermore, the second human-computer interaction unit is set as a touch display screen.
Still further, the power supply unit comprises a lithium battery, the input end of the power supply unit is electrically connected with the output end of the lithium battery, and the output end of the power supply unit is respectively an inverter for supplying power to the measuring module, the data processing unit and the human-computer interaction module, and an on-off key for controlling the lithium battery. The inverter is in the prior art, can convert direct current into 220V power frequency alternating current to supply power to the device, and is not described herein again.
Furthermore, an operating system of the single chip microcomputer with the built-in data processing unit is set as a windows operating system, or other operating systems which can run matlab and can process data of the measurement module at the same time.
The method for detecting the corrosion fault of the grounding grid of the oil field tank field by using the fault detection device of the grounding grid of the oil field tank field comprises the following steps:
step S1: drawing a topological structure diagram according to a construction diagram of a tank field grounding grid, wherein the topological structure diagram takes a grounding grid down lead as a node, and a connecting line of two connected nodes as a branch, and finally forms a topological structure diagram consisting of a plurality of circles and connecting lines between two adjacent circles;
step S2: combining the topological structure chart to carry out node numbering and branch numbering on the tank field grounding grid;
step S3: generating a correlation node matrix according to the node number and the branch number;
step S4: according to the topological structure diagram, a branch between two nodes is electrically connected by an auxiliary lead; then, sequentially measuring the resistance of each branch corresponding to the auxiliary lead, the contact resistance of each auxiliary lead and a down lead port of the grounding grid, and measuring the port resistance between adjacent nodes;
step S5: the corrosion fault detection program utilizes the measured resistance, contact resistance and port resistance of the auxiliary lead to calculate the multiple relation between the actual resistance and the resistance when the auxiliary lead is not corroded;
step S6: obtaining a corrosion detection result; in the diagnostic schematic of the corrosion failure detection program, the ring segments with corrosion levels ranging from no corrosion, slight corrosion, moderate corrosion to severe corrosion are blue, yellow, orange and red in color, respectively.
Further, detection means are employed in steps S3 to S6; the detection device is shaped as a cuboid, the outer surface of the detection device is respectively provided with a touch display screen, a digital display tube, four measuring electrodes and an on-off key, and a lithium battery, an inverter, a single chip microcomputer and a plurality of connecting data lines are accommodated in the detection device;
the data processing unit is provided with a plurality of data interfaces, preferably, the data interfaces are set to be USB interfaces, the number of the data interfaces is set to be two, one data interface transmits data to the measuring module through a USB-to-RS 232 serial port data line, and the other data interface is used for being connected with other equipment (such as equipment capable of modifying bug of corrosion fault detection program).
The invention is characterized in that the appearance dimension specifications of the grounding grid fault detection device of the oil field tank field are respectively set as follows: 400mm-450mm, 300mm-380mm wide, 150mm-200mm high, touch display screen, digital display tube, four measure pole and on-off key are all set up on the top surface of the apparatus;
the distance between the touch display screen and the left boundary of the equipment is 15mm-18mm, and the distance between the touch display screen and the upper boundary is 30mm-40 mm;
the digital display tube is 15mm-24mm away from the display screen, 45mm-50mm away from the right side and 120mm-130mm away from the upper boundary;
the distance between the on-off key and the digital display tube on the left side is 10mm-20mm, and the distance between the on-off key and the digital display tube on the upper side is 70mm-80 mm;
the four measuring poles are positioned 18mm-21mm away from the right side and 50mm-60mm away from the upper side;
the four measuring poles are arranged in parallel to the right boundary, and the adjacent distance between four ends is 8mm-12 mm.
The invention is characterized in that the appearance size specification of the single chip is as follows: the length is 292-295mm, the width is 200-208mm, and the height is 4-15 mm;
the power supply module is arranged in the fault detection device of the grounding grid of the oil field tank area and clings to the inner wall below the fault detection device, the external dimension specification of the lithium battery is set to be 205mm-215mm long, 115mm-125mm wide and 10mm-20mm high, the power output range is set to be 10V-20V, and the capacity is set to be 20000mAh-180000 mAh;
the lithium battery is arranged at the lower right part in the device, and the inverter is arranged at the lower left part in the device and is 50-60 mm away from the left side wall;
the charging hole of the lithium battery is 100mm-110mm away from the right side boundary and 5mm-7mm away from the lower side boundary.
When the invention is actually used: the specific operation steps are as follows:
the method comprises the following steps: the device is connected: and installing an oil field tank field grounding grid fault detection device, opening a switch key, and starting to measure 30 minutes after the power supply is switched on. The lead wire is connected to the measuring electrode of the device (two voltage electrodes U)1,U2And two current poles I1,I2Voltage and current poles cannot be short-circuited, respectively).
Step two: initialization: and starting a corrosion fault detection program, and adjusting the data transmission baud rate to 4800bps at the data processing terminal. And (3) carrying out zero calibration on the equipment, firstly pressing an M key on the touch display screen, firstly pressing a corresponding range switch during calibration, then pressing a 0 key below a C panel, and adjusting a Z potentiometer of the front panel to display the number as 0. And resetting the switch after the calibration is finished.
Step three: setting parameters: and setting parameters of the grounding grid in a corrosion fault detection program, wherein the parameters comprise the annular number of the grounding grid, the number of grounding wires, the area of the grounding grid and a topological structure. And after the setting is finished, modifying the established model by the model of the grounding grid according to the actual condition of the grounding grid of the oil field tank field to obtain an actual grounding grid model. And inputting the theoretical resistivity and the length of the grounding grid into the corresponding module position of the corrosion fault detection program, and inputting the resistance and the contact resistance of the auxiliary lead into a correction module of the corrosion fault detection program.
Step four: measurement and transmission of data: after selecting proper measuring range, the measured ring section clicked on the display screen corresponding to the geonet section pops up a test attribute window, and a proper test port and the U of the geonet test line are selected1Terminal and I1The end is connected to one end of the ring section to be measured at the same time, U2Terminal and I2The end is connected with the other end of the tested ring section. After the reading is stable, clicking 'obtaining the measured resistance' on the attribute interface, transmitting and displaying the measured resistance value in the 'measured resistance' item in 3-10 seconds, and clicking a 'save' button. This operation is repeated until all the network segments have been measured.
Step five: data processing and diagnosis result display: and clicking a 'calculation' button on a diagnosis program interface to display a diagnosis result in the diagnosis schematic diagram. In the diagnostic schematic, the ring segments, which have a degree of corrosion ranging from no corrosion, slight corrosion, moderate corrosion to severe corrosion, are blue, yellow, orange and red in color, respectively. The actual resistance of each ring segment in the earth screen is shown in the diagnostic histogram as a multiple of the resistance without corrosion. And completing the trenchless detection of the corrosion fault of the grounding grid of the oil field tank field.
Experimental example:
step S1: drawing a topological structure diagram according to a construction diagram of a tank field grounding grid, wherein the topological structure diagram takes a grounding grid down lead as a node, and a connecting line of two connected nodes as a branch, and finally forms a topological structure diagram consisting of a plurality of circles and connecting lines between two adjacent circles;
step S2: node numbering 1, 2, 3 and 4 and branch numbering 1, 2, 3 and 4 are carried out by combining the topological structure diagram and utilizing a method for numbering the branches and the nodes of the tank area grounding network;
step S3: generating a correlation node matrix according to the node number and the branch number;
step S4: according to the topological structure diagram, two auxiliary wires which are about 10m long are used for electrically connecting branches between two nodes; then, measuring the resistance of the auxiliary lead 1 by using a digital direct current bridge, wherein the total resistance value is 36.52m omega, measuring ten groups of numerical values of contact resistances of each auxiliary lead and a down lead port of the grounding network by using a contact resistance standardized measurement method, the arithmetic mean value of the numerical values is 3.56m omega, and measuring the port resistance between adjacent nodes;
step S5: the corrosion fault detection program calculates the multiple relation between the actual resistance and the resistance under the non-corrosion condition by using the measured resistance, contact resistance and port resistance of the auxiliary lead, wherein the multiple of the increase of the port resistance with branch numbers of 1, 2 and 3 is 0.12, 0.33 and 0.04, and the multiple of the increase of the port resistance with branch number of 4 is 1.87;
step S6: obtaining a corrosion detection result; in the visual display of the corrosion fault detection program, namely the diagnosis schematic diagram, the color of the ring segments with the branch numbers 1, 2 and 3 is blue, and the color of the ring segment with the branch number 4 is orange.
In addition, the grounding grid conductor with the branch number of 4 is excavated, and the grounding grid conductors with the branch numbers of 1, 2 and 3 are observed to be almost free from corrosion, and the grounding grid conductor with the branch number of 4 is obviously corroded, so that the accuracy of the detection procedure is verified.
Dozens of grounding grids in the victory oil field are subjected to corrosion detection by the detection method, and the accuracy is 95% through verification of an excavation mode.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A method for detecting corrosion faults of an oil field tank field grounding grid is characterized by being carried out by utilizing an oil field tank field grounding grid corrosion fault detection device, wherein the oil field tank field grounding grid corrosion fault detection device comprises a measurement module, a data processing unit, a human-computer interaction module and a power supply unit; wherein the data processing unit: the system comprises a man-machine interaction module, a corrosion fault calculation module and a corrosion fault calculation module, wherein the man-machine interaction module is used for receiving input information of the man-machine interaction module, receiving measurement information of the measurement unit, converting the measurement information of the measurement unit into a measurement result, outputting the measurement result to the man-machine interaction module, calculating a corrosion fault result by using the received input information and the measurement information, and outputting the calculated corrosion fault result to the man-machine interaction module;
the human-computer interaction module: the system comprises a first human-computer interaction unit for displaying a measurement result and a second human-computer interaction unit for inputting information and displaying a calculated corrosion fault result;
the detection method comprises the following steps:
step S1: drawing a topological structure diagram according to a construction diagram of a tank field grounding grid, wherein the topological structure diagram takes a grounding grid down lead as a node and a connecting line of two connected nodes as a branch, and finally forms a topological structure diagram consisting of a plurality of circles and connecting lines between two adjacent circles;
step S2: combining the topological structure chart to carry out node numbering and branch numbering on the tank field grounding grid;
step S3: generating a correlation node matrix according to the node number and the branch number;
step S4: according to the topological structure diagram, a branch between two nodes is electrically connected by an auxiliary lead; then, sequentially measuring the resistance of each branch corresponding to the auxiliary lead, the contact resistance of each auxiliary lead and a down lead port of the grounding grid, and measuring the port resistance between adjacent nodes;
step S5: the corrosion fault detection program utilizes the measured resistance of the auxiliary lead, the contact resistance and the port resistance to calculate a multiple relation between the actual resistance and the resistance under the condition of no corrosion;
step S6: obtaining a corrosion detection result; in the diagnosis schematic diagram of the corrosion fault detection program, the colors of ring segments with corrosion degrees from no corrosion, slight corrosion, medium corrosion to severe corrosion are blue, yellow, orange and red respectively;
the method for calculating the corrosion fault result in the data processing unit specifically comprises the following steps:
firstly, establishing mathematical equations before and after corrosion of a grounding grid conductor by utilizing the Taylor's theorem and a circuit principle;
secondly, the numerical value of the contact resistance is used as error correction, and a contact resistance error correction equation is established:
wherein, Δ RijThe change in port resistance of ij from normal, Rtouch is the contact resistance, Δ RkIs the change in resistance of branch k from normal, IkFor corrosion of the current of the branch k before the fault, Ik' is the current of branch k after corrosion failure, I0The magnitude of the current applied between the ij ports;
and finally, carrying out numerical value iterative calculation by using a non-negative least square method to obtain a final calculation result, namely a multiple relation between the actual resistance and the resistance without corrosion, and displaying the result in a visual display mode, namely a diagnosis schematic diagram.
2. The method of claim 1, wherein the measurement module comprises two sets of input units, namely a voltage input unit and a current input unit; and the measurement result of the measurement information of the measurement module converted by the data processing unit is a resistance value.
3. The method of claim 2, wherein each set of the input units is configured as two measurement poles respectively detachably provided with leads.
4. The method of claim 1, wherein the first human-machine interaction unit is configured as a digital display tube.
5. The method for detecting the corrosion fault of the grounding grid of the oilfield tank field according to claim 1, wherein the second human-computer interaction unit is arranged as a touch display screen.
6. The method according to claim 1, wherein the power supply unit comprises a lithium battery, an input end of the power supply unit is electrically connected with an output end of the lithium battery, and output ends of the power supply unit are respectively an inverter for supplying power to the measurement module, the data processing unit and the human-computer interaction module, and an on-off key for controlling the lithium battery.
7. The method for detecting the corrosion fault of the grounding grid of the oilfield tank field according to claim 1, wherein an operating system of a single chip microcomputer with the built-in data processing unit is set as a windows operating system or other operating systems which can run matlab and can process data of the measurement module at the same time.
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