CN112345591A - Stray current protection method based on multipoint synchronous monitoring and field drainage test - Google Patents
Stray current protection method based on multipoint synchronous monitoring and field drainage test Download PDFInfo
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Abstract
The invention provides a stray current protection method based on multipoint synchronous monitoring and a field drainage test, relates to the technical field of buried pipeline monitoring, can improve the effectiveness and accuracy of buried pipeline dynamic direct current stray current monitoring, and has the advantages of wide coverage range, high efficiency, high accuracy and good effect; the method comprises the following steps: s1, selecting a plurality of monitoring points in the current interference pipe section for monitoring and analyzing to obtain distribution data of main inflow points and main outflow points of the current interference pipe section; s2, selecting the installation position of the temporary drainage ground bed to carry out a field feeding drainage test according to the distribution data of the main inflow point and the main outflow point; and S3, making a drainage scheme of the stray current according to the test result and carrying out drainage. The technical scheme provided by the invention is suitable for the drainage process of the buried pipeline.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of buried pipeline monitoring, in particular to a stray current protection method based on multipoint synchronous monitoring and field drainage test.
[ background of the invention ]
In recent years, with the continuous development of the transportation and transportation industry, the problem of interference of subway dynamic direct current stray current on a buried pipe section is increasingly prominent. Drainage is used as an effective measure for relieving dynamic direct current stray current interference and is widely applied to buried pipelines for water, oil and gas transmission and the like. However, for determining and researching the inflow and outflow laws of the dynamic dc stray current and drainage measures made according to the inflow and outflow laws, monitoring of the dynamic dc stray current of the buried pipeline needs to be carried out. The monitoring time of the dynamic stray current generally needs more than 24 hours, and not only the current intensity at different times but also the current direction and the change characteristics at different positions at the same time need to be considered. How to more accurately and effectively monitor the dynamic direct current stray current becomes the key for guaranteeing the safe operation of the buried pipeline. At present, various well-known field stray current monitoring technologies have certain problems, the problem of synchronous monitoring of all points of dynamic direct current stray current of a buried pipeline cannot be solved, certain deviation exists in analysis of stray current inflow and outflow rules, and the inflow and outflow rules at the same time cannot be reflected. In addition, for the subsequent field drainage test, stray current monitoring is also needed, and accurate drainage test data can be obtained through effective monitoring.
Therefore, there is a need to develop a method for testing on-site drainage of dynamic dc stray currents of buried pipelines based on multipoint synchronous monitoring to overcome the shortcomings of the prior art, so as to solve or alleviate one or more of the above problems.
[ summary of the invention ]
In view of the above, the invention provides a stray current protection method based on multipoint synchronous monitoring and field drainage test, which can improve the effectiveness and accuracy of buried pipeline dynamic direct current stray current monitoring and has the advantages of wide coverage and good effect.
In one aspect, the present invention provides a stray current protection method based on multipoint synchronous monitoring and field drainage test, wherein the protection method comprises the steps of:
s1, selecting a plurality of monitoring points in the current interference pipe section for monitoring and analyzing to obtain distribution data of main inflow points and main outflow points of the current interference pipe section;
s2, selecting the installation position of the temporary drainage ground bed to carry out a field feeding drainage test according to the distribution data of the main inflow point and the main outflow point;
and S3, making a drainage scheme of the stray current according to the test result and carrying out drainage.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, and the content of step S1 includes: respectively installing a test piece and a reference electrode for stray current testing at each monitoring point, and monitoring and analyzing the energizing potential of the test piece, the power-off potential of the test piece and the direct current density of the test piece to obtain distribution data of a main inflow point and a main outflow point of the current interference pipe section; the distribution data of the main inflow point and the main outflow point comprises position data corresponding to the monitoring points, the test piece electrifying potential, the test piece power-off potential, the direct current density and the inflow or outflow quantity.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, and the content of step S2 includes: the method comprises the steps of selecting the installation position of a temporary drainage ground bed according to distribution data of a main inflow point and a main outflow point, carrying out a feed drainage test on the temporary drainage ground bed through a feed power supply after the temporary drainage ground bed is installed, and monitoring the test piece electrifying potential, the test piece power-off potential and direct current density distribution data of each monitoring point along a pipeline under the condition of different drainage currents.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, and the content of step S3 includes: and determining design parameters of the drainage ground bed during actual drainage according to the test result, thereby formulating a drainage scheme of the stray current.
The above aspects and any possible implementation manners further provide an implementation manner that each monitoring point is monitored for a continuous period of time by using a test piece electrical method, and monitoring data is recorded by using a data recorder.
The above-described aspects and any possible implementations further provide an implementation in which the continuous period of time is specifically 12 hours, 24 hours, 36 hours, or 48 hours.
The above aspect and any possible implementation further provide an implementation in which the monitoring point covers the entire area of the current-disturbing pipe section.
In the above aspect and any possible implementation manner, a data recorder for recording the test piece energizing potential, the test piece deenergizing potential and the direct current density is further provided at each monitoring point before the feeding and draining test is performed.
In the foregoing aspect and any possible implementation manner, an implementation manner is further provided, where whether the monitored point is a main inflow point or a main outflow point is determined according to whether a positive or negative offset of a potential or a positive or negative flow of a current exists at the monitored point.
The above-described aspects and any possible implementations further provide an implementation in which the number of primary entry points or primary exit points is 1 or more.
Compared with the prior art, the invention can obtain the following technical effects: the invention improves the validity and the accuracy of current detection data by utilizing the multipoint synchronous monitoring of the dynamic direct current stray current of the buried pipeline; meanwhile, large-range and high-efficiency monitoring of the stray current of the dynamic branch of the buried pipeline can be guaranteed, and a high-quality drainage design scheme is obtained.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a stray current protection method based on multipoint synchronous monitoring and field drainage test according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In order to solve the problems in the prior art, the invention provides a buried pipeline dynamic direct current stray current protection design method based on multipoint synchronous monitoring and field drainage test, which comprises the following steps:
firstly, selecting a plurality of monitoring points in a dynamic stray current interference pipe section, installing a stray current test strip and a reference electrode, monitoring and analyzing the energizing potential, the power-off potential and the direct current density of the test strip, and obtaining the relative position relation and distribution data of a main inflow point and a main outflow point of the dynamic stray current interference pipe section;
the specific content of the step should include:
1) selecting a plurality of monitoring points on the dynamic stray current interference pipe section, and installing a stray current test piece and a reference electrode;
2) a test piece electrical method is adopted, and a data recorder is used for synchronously and continuously monitoring the electrifying potential, the test piece power-off potential and the test piece direct current density of each test point of the buried pipeline for 24 hours; the length of the continuous monitoring time period can be other according to actual conditions, such as 12 hours, 36 hours, 48 hours and the like; 24 hours is the preferred length of monitoring time, enabling a balance between data volume and time cost;
3) after subway stray current interference parameters at different positions on a buried pipeline are obtained, test results of power-on and power-off potentials are obtained through software drawing, then fluctuation rules of the power-on and power-off potentials of all monitoring points along with time are analyzed, and relative position relation and distribution data of a main inflow point and a main outflow point of the dynamic stray current interference pipeline section are obtained.
The main inflow point and the main outflow point are judged according to whether positive and negative deviations of the potential or positive and negative flows of the current exist at each monitoring point of the pipeline, and the point can be judged as the main inflow point or the main outflow point when the deviation or the flow exists. A positive shift in potential or a negative flow of current implies the outflow of stray current, i.e. the main outflow point; a negative shift in potential or a positive flow of current implies the inflow of stray current, i.e. the main point of inflow.
The monitoring points cover the entire area of the current interference tube section.
Selecting the installation position of a field temporary drainage ground bed according to the relative position relation and distribution data of inflow and outflow of dynamic stray current, correspondingly installing the temporary drainage ground bed at the relative positions of inflow and outflow (generally, the cross distribution of the positions of an inflow point and an outflow point cannot occur, the inflow and outflow are corresponding different positions, and if the drainage ground bed is installed at the outflow position, the inflow position is also correspondingly installed), carrying out a feed drainage test on the drainage ground bed through a feed power supply, and simultaneously monitoring the power-on potential of a test piece along the pipeline, the power-off potential of the test piece and the distribution data of direct current density by utilizing the monitoring points arranged before;
the specific content of the step should include:
1) selecting the installation position of the on-site temporary drainage ground bed according to the relative position relation of inflow and outflow of the dynamic stray current and the feasibility of ground bed excavation;
2) installing a data recorder in advance by utilizing the monitoring points distributed previously for recording the test data of the power-on potential of the monitoring points, the power-off potential of the test piece and the direct current density;
3) and performing a feed drainage test on the drainage ground bed through a feed power supply, adjusting the drainage current of the temporary drainage ground bed in the field drainage test process, and obtaining distribution data of the electrified potential, the test piece power-off potential and the direct current density of each monitoring point along the pipeline under different drainage current conditions.
Calculating the total drainage quantity and design parameters of the formal drainage ground bed according to the drainage test result;
the specific content of the step should include:
1) selecting a favorable position to install the anode ground bed according to the field drainage test result and the field installation condition;
2) selecting proper anode materials, and determining the quantity of the needed anode materials through calculation;
3) selecting a proper anode cable model according to the number of cables for each group of anodes in the anode system and considering two aspects of current capacity and mechanical strength of the anode cables;
4) and designing a forced drainage power supply by calculating the voltage in the loop, and selecting a proper forced drainage power supply by considering the service time and the allowance.
And fourthly, on the basis of the field test, the test and the calculation, a dynamic direct current stray current drainage scheme of the buried pipeline is formulated.
The buried pipeline dynamic direct current stray current protection design method based on multipoint synchronous monitoring and field drainage test can improve the scientificity and effectiveness of the buried pipeline dynamic direct current stray current protection scheme formulation, and has the advantages of wide coverage and good effect.
Example 1:
the embodiment provides a buried pipeline dynamic direct current stray current protection design method based on multipoint synchronous monitoring and field drainage test, which comprises the following steps:
(1) selecting a plurality of monitoring points on the dynamic stray current interference pipe section, and installing a stray current test piece and a reference electrode;
(2) connecting the test strip line, the reference electrode line and the pipeline line to a UDL-2 type data recorder; the method comprises the following steps that 1s of a parameter set by the UDL-2 type data recorder records a numerical value, 20s of a cycle period and 3s of power-off time; synchronously and continuously monitoring the energizing potential of the buried pipeline along each test point, the power-off potential of the test piece and the direct current density of the test piece for 24 hours by adopting a test piece electrical method and using a UDL-2 type data recorder;
(3) after subway stray current interference parameters at different positions on a buried pipeline are obtained, test results of power-on and power-off potentials are obtained through software drawing, and then the fluctuation change rule of the power-on and power-off potentials of the pipeline along with time is analyzed; analyzing and comparing synchronous test data of a plurality of position currents on a pipeline by detecting positive and negative flows of the currents to obtain the relative position relation and distribution data of a main inflow point and a main outflow point of the dynamic stray current interference pipe section;
(4) selecting the installation position of the on-site temporary drainage ground bed according to the relative position relation of inflow and outflow of the dynamic stray current and the feasibility of ground bed excavation;
(5) installing a UDL-2 type data recorder in advance by utilizing the monitoring points distributed previously, and testing the power-on potential, the power-off potential of the test piece and the direct current density before and after interference mitigation;
(6) carrying out a feed drainage test on the drainage ground bed through a feed power supply, and adjusting drainage current of the temporary drainage ground bed in the field drainage test process to obtain the electrified potential along the pipeline, the power-off potential of the test piece and the direct current density distribution data under different drainage currents;
(7) selecting a favorable position to install the anode ground bed according to the field drainage test result and the field installation condition;
(8) selecting MMO with phi 50 × 1000mm (prepackaged size phi 273 × 2000mm, 50 kg/count) as anode material, and its maximum output current density is 100A/m2；
(9) And calculating the number of anodes according to the requirement of anode grounding resistance. The single anode grounding resistance is calculated by adopting the formula:
wherein, Ra, h: ground resistance (Ω) of the anode; ρ is the resistivity of the soil (Ω · m); l: anode length (m); d: anode diameter (m); t: the subsurface buried depth.
The grounding resistance of a plurality of horizontal anode groups connected to the same main cable is calculated by adopting the following formula (II):
in the formula, Rgb,h: total grounding resistance of N horizontal anodes (omega); ra,h: resistance of a single anode, (Ω); n: the number of anodes; s: center-to-center spacing between anodes, (m); f: a clustering factor.
The using quantity of the MMO anode is determined by the anode quantity calculation.
(10) Each group of anodes in the anode system is led to an anode junction box by a cable, and the cable of each anode is reserved for 3m at a wellhead; the anode cable is selected mainly by considering two aspects of current capacity and mechanical strength, and halogen ions in the environment are also an important factor, and the model of the selected anode cable is YJV-1KV-1 multiplied by 16mm by combining the consideration2。
(11) And selecting an anode packing material. The prepackaged anode is petroleum coke, the content of C is more than 85%, and the particle size of the coke is preferably 1-3 mm;
(12) installing auxiliary tools such as an exhaust pipe, a hole positioning device, an anode junction box, an anode well cover and the like;
(13) the power supply is forced to drain by the calculation of the voltage in the loop. Wherein, the total resistance of the loop is calculated by adopting a formula (IV):
RT＝Ra+RW+Ru+Rc ④
in the formula, Ra: an anode grounding resistor; rw: a wire resistance; ru: unknown componentA resistance; rc: the cathode is electrically resistive to ground.
The voltage is calculated by adopting the formula (v):
E＝IR+Ep ⑤
in the formula, Ep: the back electromotive force is generally 2V.
In consideration of service time and allowance, two anti-interference potentiostats (60V/20A, one for one and one for standby) are selected as the forced drainage power supply, and the model is SMART IMRT-1H;
(14) on the basis of the field test, test and calculation, a dynamic direct current stray current drainage scheme of the buried pipeline is formulated;
(15) after the protection scheme is implemented, effect test and evaluation are carried out.
The stray current protection method based on multipoint synchronous monitoring and field drainage test provided by the embodiment of the application is described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A stray current protection method based on multipoint synchronous monitoring and field drainage test is characterized by comprising the following steps:
s1, selecting a plurality of monitoring points in the current interference pipe section for monitoring and analyzing to obtain distribution data of main inflow points and main outflow points of the current interference pipe section;
s2, selecting the installation position of the temporary drainage ground bed to carry out a field feeding drainage test according to the distribution data of the main inflow point and the main outflow point;
and S3, preparing an actual drainage scheme of the stray current according to the test result and carrying out drainage.
2. The method for stray current protection based on multi-point synchronous monitoring and field drainage test as claimed in claim 1, wherein the step S1 comprises: and respectively installing a test piece and a reference electrode for stray current testing at each monitoring point, and monitoring and analyzing the energizing potential of the test piece, the power-off potential of the test piece and the direct current density to obtain distribution data of a main inflow point and a main outflow point of the current interference pipe section.
3. The method for stray current protection based on multi-point synchronous monitoring and field drainage test as claimed in claim 1, wherein the step S2 comprises: the method comprises the steps of selecting the installation position of a temporary drainage ground bed according to distribution data of a main inflow point and a main outflow point, carrying out a feed drainage test on the temporary drainage ground bed through a feed power supply after the temporary drainage ground bed is installed, and monitoring distribution data of test piece electrifying potential, test piece power-off potential and direct current density of each monitoring point along a pipeline under the condition of different drainage currents.
4. The method for stray current protection based on multi-point synchronous monitoring and field drainage test as claimed in claim 1, wherein the step S3 comprises: and determining design parameters of the drainage ground bed during actual drainage according to the test result, thereby formulating an actual drainage scheme of the stray current.
5. The stray current protection method based on the multi-point synchronous monitoring and the field drainage test as claimed in claim 2, characterized in that each monitoring point is monitored for a continuous period of time by a test piece electrical method, and monitoring data is recorded by a data recorder.
6. The method for stray current protection based on simultaneous multipoint monitoring and field drainage test according to claim 5, wherein the continuous time period is in particular 12 hours, 24 hours, 36 hours or 48 hours.
7. The stray current protection method based on the multi-point synchronous monitoring and field drainage test as claimed in claim 1, wherein the monitoring points cover the whole area of the current interference pipe section.
8. The method for stray current protection based on multi-point synchronous monitoring and field drainage test as claimed in claim 3, wherein before the feeding drainage test, a data recorder for recording the test strip energizing potential, the test strip de-energizing potential and the DC current density is installed at each monitoring point.
9. The stray current protection method based on the multipoint synchronous monitoring and field drainage test as claimed in claim 1, wherein whether the monitoring point is a main inflow point or a main outflow point is determined according to whether the monitoring point has positive and negative offsets of potential or positive and negative flows of current.
10. The stray current protection method based on multipoint synchronous monitoring and field drainage test as claimed in claim 1, wherein the number of main inflow points or main outflow points is 1 or more.
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