CN115902500B - Multi-source detection method for characteristic parameters of grounding network - Google Patents
Multi-source detection method for characteristic parameters of grounding network Download PDFInfo
- Publication number
- CN115902500B CN115902500B CN202310012936.5A CN202310012936A CN115902500B CN 115902500 B CN115902500 B CN 115902500B CN 202310012936 A CN202310012936 A CN 202310012936A CN 115902500 B CN115902500 B CN 115902500B
- Authority
- CN
- China
- Prior art keywords
- real
- time
- grounding
- resistance
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 103
- 230000008859 change Effects 0.000 claims abstract description 94
- 230000007613 environmental effect Effects 0.000 claims abstract description 14
- 239000002689 soil Substances 0.000 claims description 87
- 238000005259 measurement Methods 0.000 claims description 41
- 238000012546 transfer Methods 0.000 claims description 37
- 238000004364 calculation method Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 15
- 239000004020 conductor Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 238000010223 real-time analysis Methods 0.000 claims description 8
- 238000011897 real-time detection Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 abstract description 4
- 238000007405 data analysis Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a multi-source detection method for characteristic parameters of a grounding grid, which relates to the technical field of grounding grid detection, and comprises the following steps: classifying the characteristic parameters of the grounding network to be detected, pre-detecting each characteristic parameter of the grounding network, and setting the characteristic parameters as pre-detection characteristic parameters; classifying the environmental parameters of the grounding network to be detected, setting influence parameters for the classified environmental parameters, pre-detecting the influence parameters, and setting the influence parameters as pre-detection influence parameters; detecting the characteristic parameter change of the grounding network to be detected in real time, and setting the characteristic parameter change as a characteristic real-time parameter; detecting the change of the influence parameters in real time and setting the change as the environment real-time parameters; according to the invention, the comprehensive detection analysis is carried out on the multi-source data of the grounding grid and the environmental factors, so that the problems of single safety detection mode and data analysis mode, lag of safety early warning and insufficient accuracy of the existing grounding grid are solved.
Description
Technical Field
The invention relates to the technical field of grounding grid detection, in particular to a multi-source detection method for characteristic parameters of a grounding grid.
Background
The grounding grid is a general term for a grounding body which is formed by a plurality of metal grounding poles buried in the ground at a certain depth and connecting the grounding poles by conductors. The device is widely applied to the industries of electric power, buildings, computers, industrial and mining enterprises, communication and the like, and plays roles of safety protection, shielding and the like. The grounding grid has a large size, is very complex and huge, and is formed by only one grounding electrode, and is generally designed according to the needs. The condition of the grounding device is directly related to the safety of the power system, and it is important to scientifically and reasonably test various characteristic parameters of the grounding device and accurately evaluate the condition of the grounding device.
In the prior art, the test work of the grounding device is weaker, the technical means is behind, and the analysis means for the grounding grid detection data is single, so that the operation safety of the grounding grid is difficult to early warn in time, and therefore, a multi-source detection method for the grounding grid characteristic parameters is lacked to solve the problems.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a multi-source detection method for the characteristic parameters of the grounding network, which is used for comprehensively detecting and analyzing the multi-source data of the grounding network and the environmental factors so as to solve the problems of single safety detection mode and data analysis mode, lag safety early warning and insufficient accuracy of the existing grounding network.
In order to achieve the above object, the present invention is realized by the following technical scheme: a multi-source detection method for a characteristic parameter of a ground network, the detection method comprising the steps of:
step S10, classifying the characteristic parameters of the grounding network to be detected, pre-detecting each characteristic parameter of the grounding network, and setting the characteristic parameters as pre-detection characteristic parameters;
step S20, classifying the environmental parameters of the grounding network to be detected, setting influence parameters for the classified environmental parameters, pre-detecting the influence parameters, and setting the influence parameters as pre-detection influence parameters;
step S30, detecting the characteristic parameter change of the grounding network to be detected in real time, and setting the characteristic real-time parameter; detecting the change of the influence parameters in real time and setting the change as the environment real-time parameters;
step S40, setting the pre-detection characteristic parameter and the pre-detection influence parameter as pre-detection parameters, and setting the characteristic real-time parameter and the environment real-time parameter as real-time detection parameters; analyzing the pre-detection parameters and the real-time detection parameters to obtain the real-time analysis state of the grounding grid, and carrying out grounding grid safety pre-warning based on the real-time analysis state.
Further, the step S10 includes the following sub-steps:
step S101, dividing the characteristic parameters of the grounding grid into a grounding resistor, a contact potential difference, a stride potential difference and a transfer potential;
step S102, acquiring a grounding resistor by adopting a voltage and current detection method, acquiring grounding voltage and grounding current, and obtaining the grounding resistor by the grounding voltage and the grounding current through a resistor calculation formula; the resistance calculation formula is configured as follows:wherein R is jd For ground resistance, U jd To the ground voltage, I jd Is the ground current;
step S103, setting a first vertical measurement point and a second vertical measurement point for measuring a contact potential difference, respectively measuring current values at the first vertical measurement point and the second vertical measurement point by using a millivolt meter, respectively setting the first vertical current value and the second vertical current value, obtaining absolute values of differences of the first vertical current value and the second vertical current value, and setting the absolute values as the contact potential difference;
step S104, setting a first horizontal measurement point and a second horizontal measurement point for measuring the stride potential difference, respectively measuring current values at the first horizontal measurement point and the second horizontal measurement point by using a millivolt meter, respectively setting the first horizontal current value and the second horizontal current value, obtaining absolute values of differences of the first horizontal current value and the second horizontal current value, and setting the absolute values as the stride potential difference;
step S105, setting a metal conductor with one end connected with a grounding grid, measuring the ground potential transferred to the grounding grid by the metal conductor, and setting the ground potential as a transfer potential;
step S106, setting the ground resistance, the contact potential difference, the stride potential difference, and the transfer potential detected in steps S102, S103, S104, and S105 to a pre-detection ground resistance, a pre-detection contact potential difference, a pre-detection stride potential difference, and a pre-detection transfer potential, respectively; and the pre-detection grounding resistance, the pre-detection contact potential difference, the pre-detection stride potential difference and the pre-detection transfer potential are set as pre-detection characteristic parameters.
Further, the step S20 further includes the following sub-steps:
step S201, dividing the environmental parameters into soil resistance and soil humidity;
step S202, measuring the resistivity of the soil by adopting a tripolar method; measuring soil humidity by adopting a humidity sensor;
step S203, calculating the soil resistivity and the soil humidity through a soil resistance influence formula to obtain a soil resistance influence coefficient, wherein the soil resistance influence formula is configured as follows: xtd=ρxk1+st×k2; wherein Xtd is the soil resistance influence coefficient, ρ is the soil resistivity, k1 is the soil resistance influence duty factor, st is the soil humidity, k2 is the soil humidity duty factor, and the soil resistance influence coefficient is set as the pre-detection influence parameter.
Further, the step S30 further includes the following sub-steps:
step S3011, detecting the characteristic parameter change of the grounding network in real time;
step S3012, acquiring a grounding electrode resistance and a grounding wire resistance by adopting a voltage and current detection method;
the method comprises the steps of obtaining grounding electrode voltage and grounding electrode current, and obtaining grounding electrode resistance through a grounding electrode resistance calculation formula; the ground electrode resistance calculation formula is configured as follows:wherein R is dj U is the resistance of the grounding electrode dj For the voltage of the grounding electrode, I dj Is the current of the grounding electrode;
obtaining ground wire voltage and ground wire current, and obtaining ground wire resistance through a ground wire resistance calculation formula; the ground wire resistance calculation formula is configured as follows:wherein R is dx U is the resistance of the grounding wire dx In order to be a ground line voltage,I dx is the ground line current;
adding the grounding electrode resistance and the grounding wire resistance to obtain a real-time grounding reference resistance;
step S3013, respectively measuring real-time current values at a first vertical measurement point and a second vertical measurement point by using a millivoltmeter, respectively setting the real-time current values as a first vertical real-time current value and a second vertical real-time current value, obtaining absolute values of differences of the first vertical real-time current value and the second vertical real-time current value, and setting the absolute values as contact real-time potential differences;
step S3014, respectively measuring real-time current values at a first horizontal measurement point and a second horizontal measurement point by using a millivoltmeter, respectively setting the real-time current values as a first horizontal real-time current value and a second horizontal real-time current value, and setting the real-time current values as a stride real-time potential difference by using absolute values of differences of the first horizontal real-time current value and the second horizontal real-time current value;
step S3015, measuring the real-time potential of the grounding network transmitted by the metal conductor, and setting the real-time potential to be transferred;
step S3016, setting the real-time ground reference resistance, the contact real-time potential difference, the stride real-time potential difference, and the transfer real-time potential detected in steps S3012, S3013, S3014, and S3015 as characteristic real-time parameters.
Further, the step S30 further includes the following sub-steps:
step S3021, measuring the real-time resistivity of the soil by a tripolar method; measuring the real-time humidity of the soil by adopting a humidity sensor;
step S203, calculating the real-time resistivity and the real-time humidity of the soil through a real-time influence formula of the soil resistance to obtain a real-time influence coefficient of the soil resistance, wherein the real-time influence formula of the soil resistance is configured as follows: xstd=ρs×k1+sst×k2; wherein, xstd is the real-time influence coefficient of soil resistance, ρs is the real-time resistivity of soil, sst is the real-time humidity of soil, and the real-time influence coefficient of soil resistance is set as the real-time parameter of environment.
Further, the step S40 further includes the following sub-steps:
step S401, adding the soil resistance influence coefficient and the pre-detection grounding resistance to obtain a pre-detection grounding calibration resistance; adding the real-time influence coefficient of the soil resistance and the real-time grounding reference resistance to obtain a real-time grounding calibration resistance; the absolute value of the difference value between the pre-detection grounding calibration resistor and the real-time grounding calibration resistor is obtained, and the absolute value is set as the grounding resistor change value;
step S402, the absolute value of the difference value between the pre-detection contact potential difference and the contact real-time potential difference is obtained, and the absolute value is set as the contact potential change value; the absolute value of the difference value between the pre-detection stride potential difference and the stride real-time potential difference is obtained, and the absolute value is set as a stride potential change value; the absolute value of the difference between the pre-detected transfer potential and the transfer real-time potential is obtained and set as the transfer potential variation value.
Further, step S4021, calculating a change early warning value from the ground resistance change value, the contact potential change value, the stride potential change value and the transfer potential change value according to a change early warning formula; the change early warning formula is configured as follows: ybh = Bjd ×a1+ Bjc ×a2+ Bkb ×a3+ Bzy ×a4; wherein Ybh is a change early warning value, bjd, bjc, bkb and Bzy are respectively a ground resistance change value, a contact potential change value, a stride potential change value and a transfer potential change value; a1, a2, a3 and a4 are respectively a grounding resistance change early-warning duty cycle, a contact potential change early-warning duty cycle, a stride potential change early-warning duty cycle and a transfer potential change early-warning duty cycle, and a1+a2+a3+a4=1;
step S4022, outputting a high-change early warning signal when the change early warning value is greater than or equal to a first change threshold value; outputting a medium-change early-warning signal when the change early-warning value is larger than or equal to the second change threshold value and smaller than the first change threshold value; and outputting a low-variation early-warning signal when the variation early-warning value is smaller than the second variation threshold value.
The invention has the beneficial effects that: firstly, classifying the characteristic parameters of a grounding network to be detected, pre-detecting each characteristic parameter of the grounding network, and setting the characteristic parameters as pre-detection characteristic parameters; classifying the environment parameters of the grounding network to be detected, setting influence parameters for the classified environment parameters, pre-detecting the influence parameters, and setting the influence parameters as pre-detection influence parameters; detecting the characteristic parameter change of the grounding network to be detected in real time, and setting the characteristic parameter change as a characteristic real-time parameter; detecting the change of the influence parameters in real time and setting the change as the environment real-time parameters; finally, setting the pre-detection characteristic parameter and the pre-detection influence parameter as pre-detection parameters, and setting the characteristic real-time parameter and the environment real-time parameter as real-time detection parameters; analyzing the pre-detection parameters and the real-time detection parameters to obtain a real-time analysis state of the grounding grid, and carrying out grounding grid safety pre-warning based on the real-time analysis state; the detection method integrates multi-source data for analysis, can detect and analyze the running state of the grounding network in real time, and improves the early warning timeliness of the running safety of the grounding network.
Additional aspects 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
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of the detection method of the present invention;
fig. 2 is a flow chart of the substeps of step S10 of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, the present invention provides a multi-source detection method for a characteristic parameter of a grounding network, which performs comprehensive detection analysis on multi-source data of the grounding network and environmental factors, so as to solve the problems of single safety detection mode and data analysis mode, lag in safety early warning and insufficient accuracy of the existing grounding network.
Specifically, the detection method comprises the following steps:
step S10, classifying the characteristic parameters of the grounding network to be detected, pre-detecting each characteristic parameter of the grounding network, and setting the characteristic parameters as pre-detection characteristic parameters; referring to fig. 2, step S10 includes the following sub-steps:
step S101, dividing the characteristic parameters of the grounding grid into a grounding resistor, a contact potential difference, a stride potential difference and a transfer potential;
step S102, acquiring a grounding resistor by adopting a voltage and current detection method, acquiring grounding voltage and grounding current, and obtaining the grounding resistor by the grounding voltage and the grounding current through a resistor calculation formula; the resistance calculation formula is configured as:wherein R is jd For ground resistance, U jd To the ground voltage, I jd Is the ground current;
step S103, setting a first vertical measurement point and a second vertical measurement point for measuring a contact potential difference, respectively measuring current values at the first vertical measurement point and the second vertical measurement point by using a millivolt meter, respectively setting the first vertical current value and the second vertical current value, obtaining absolute values of differences of the first vertical current value and the second vertical current value, and setting the absolute values as the contact potential difference; specifically, the definition of the contact potential difference refers to the potential difference formed between the ground electrode and the soil after the short-circuit current passes through the grounding device, and the definition given in DL/T621-1997 "grounding of an ac electric device" is that the ground surface forms a distributed potential when the ground short-circuit (fault) current flows through the grounding device, and the potential difference between two points on the ground at a horizontal distance of 0.8m from the equipment housing, frame or wall at a vertical distance of 1.8m from the ground. The standard does not give an accurate definition as to whether the ground current inflow site is a test point. But generally refers to "when a short-to-ground (fault) current flows through the ground device" but generally refers to the point of test to ground in the textbook concerned, which is somewhat different in terms of test results, the latter measurement results including the impedance voltage of the ground device down-conductor, while the former includes mainly the resistance drop of the ground network. However, from experience, these differences are not very large, but tend to have a greater relationship with the orientation and position of the test points, i.e. the measured values in each direction are different, centered on the ground engaging means. Therefore, in practical application, the incoming point can be selected as any point in the ground network, which is convenient for on-site measurement, and the measurement speed and efficiency can be greatly increased.
Step S104, setting a first horizontal measurement point and a second horizontal measurement point for measuring the stride potential difference, respectively measuring current values at the first horizontal measurement point and the second horizontal measurement point by using a millivolt meter, respectively setting the first horizontal current value and the second horizontal current value, obtaining absolute values of differences of the first horizontal current value and the second horizontal current value, and setting the absolute values as the stride potential difference; the definition of the step potential difference is "potential difference between two points at a horizontal distance of 0.8m on the ground when a ground short circuit (fault) current flows through the ground device", and there is a problem that definition is not clear enough similarly to the above. Likewise the potential difference across the stride has a great relationship with the location and orientation of the electrode arrangement at the time of measurement, typically with a difference for each different direction.
Step S105, setting a metal conductor with one end connected with a grounding grid, measuring the ground potential transferred to the grounding grid by the metal conductor, and setting the ground potential as a transfer potential; the transfer potential is defined as: when a ground short circuit (fault) current flows through the grounding device, which is transmitted by a metal conductor connected at one end to the grounding device, is grounded. All the ground nets have a potential rise due to the presence of ground network resistance (impedance) which presents a safety hazard. In general, ground potential increases within 2000 volts are considered to be safer, i.e., not detrimental to various types of low voltage equipment. While greater than 2000 volts is considered to be a greater hazard and isolation measures are required. In fact, the grounding grid is safer to use for external metals.
Step S106, setting the ground resistance, the contact potential difference, the stride potential difference, and the transfer potential detected in steps S102, S103, S104, and S105 to a pre-detection ground resistance, a pre-detection contact potential difference, a pre-detection stride potential difference, and a pre-detection transfer potential, respectively; and the pre-detection grounding resistance, the pre-detection contact potential difference, the pre-detection stride potential difference and the pre-detection transfer potential are set as pre-detection characteristic parameters.
Step S20, classifying the environmental parameters of the grounding network to be detected, setting influence parameters for the classified environmental parameters, pre-detecting the influence parameters, and setting the influence parameters as pre-detection influence parameters; step S20 further comprises the following sub-steps:
step S201, dividing the environmental parameters into soil resistance and soil humidity;
step S202, measuring the resistivity of the soil by adopting a tripolar method; measuring soil humidity by adopting a humidity sensor;
step S203, calculating the soil resistivity and the soil humidity through a soil resistance influence formula to obtain a soil resistance influence coefficient, wherein the soil resistance influence formula is configured as follows: xtd=ρxk1+st×k2; wherein Xtd is the soil resistance influence coefficient, ρ is the soil resistivity, k1 is the soil resistance influence duty factor, st is the soil humidity, k2 is the soil humidity duty factor, and the soil resistance influence coefficient is set as the pre-detection influence parameter.
Specifically, in the implementation process, the tripolar method is set as follows: the grounding body with known geometric dimension is buried in the place where the soil resistivity is required to be measured, and the grounding resistance of the grounding body is measured according to a voltage-current method. The grounding body adopted in measurement is a steel pipe with the length of 3m and the diameter of 50 mm; or round steel with the length of 3m and the diameter of 25 mm; or a flat steel of length 10 to 15m,40mm by 4mm, and the embedded depth is 0.7 to 1.0m. When the grounding resistance is measured by adopting round steel vertically beaten into the soil, the voltage pole is far away from the current pole and the measured grounding body by 20 m. After the ground resistance is measured, the soil resistivity at the position can be calculated by the following formula. I.e., ρ= (2Γ Rg)/[ 1n (4 iota/d) ]; wherein rho is soil resistivity, omega.m; iota-depth of the steel tube or round steel buried in the soil, m; d, the outer diameter m of the steel pipe or round steel;
rg-measured resistance of the ground mass, Ω.
Step S30, detecting the characteristic parameter change of the grounding network to be detected in real time, and setting the characteristic real-time parameter; detecting the change of the influence parameters in real time and setting the change as the environment real-time parameters; step S30 further comprises the sub-steps of:
step S3011, detecting the characteristic parameter change of the grounding network in real time;
step S3012, acquiring a grounding electrode resistance and a grounding wire resistance by adopting a voltage and current detection method;
the method comprises the steps of obtaining grounding electrode voltage and grounding electrode current, and obtaining grounding electrode resistance through a grounding electrode resistance calculation formula; the ground electrode resistance calculation formula is configured as:wherein R is dj U is the resistance of the grounding electrode dj For the voltage of the grounding electrode, I dj Is the current of the grounding electrode;
obtaining ground wire voltage and ground wire current, and obtaining ground wire resistance through a ground wire resistance calculation formula; the ground wire resistance calculation formula is configured as:wherein R is dx U is the resistance of the grounding wire dx For the ground line voltage, I dx Is the ground line current;
adding the grounding electrode resistance and the grounding wire resistance to obtain a real-time grounding reference resistance;
step S3013, respectively measuring real-time current values at a first vertical measurement point and a second vertical measurement point by using a millivoltmeter, respectively setting the real-time current values as a first vertical real-time current value and a second vertical real-time current value, obtaining absolute values of differences of the first vertical real-time current value and the second vertical real-time current value, and setting the absolute values as contact real-time potential differences;
step S3014, respectively measuring real-time current values at a first horizontal measurement point and a second horizontal measurement point by using a millivoltmeter, respectively setting the real-time current values as a first horizontal real-time current value and a second horizontal real-time current value, and setting the real-time current values as a stride real-time potential difference by using absolute values of differences of the first horizontal real-time current value and the second horizontal real-time current value;
step S3015, measuring the real-time potential of the grounding network transmitted by the metal conductor, and setting the real-time potential to be transferred;
step S3016, setting the real-time ground reference resistance, the contact real-time potential difference, the stride real-time potential difference, and the transfer real-time potential detected in steps S3012, S3013, S3014, and S3015 as characteristic real-time parameters.
Step S30 further comprises the sub-steps of:
step S3021, measuring the real-time resistivity of the soil by a tripolar method; measuring the real-time humidity of the soil by adopting a humidity sensor;
step S203, calculating the real-time resistivity and the real-time humidity of the soil through a real-time influence formula of the soil resistance to obtain a real-time influence coefficient of the soil resistance, wherein the real-time influence formula of the soil resistance is configured as follows: xstd=ρs×k1+sst×k2; wherein, xstd is the real-time influence coefficient of soil resistance, ρs is the real-time resistivity of soil, sst is the real-time humidity of soil, and the real-time influence coefficient of soil resistance is set as the real-time parameter of environment.
Step S40, setting the pre-detection characteristic parameter and the pre-detection influence parameter as pre-detection parameters, and setting the characteristic real-time parameter and the environment real-time parameter as real-time detection parameters; analyzing the pre-detection parameters and the real-time detection parameters to obtain a real-time analysis state of the grounding grid, and carrying out grounding grid safety pre-warning based on the real-time analysis state; step S40 further comprises the sub-steps of:
step S401, adding the soil resistance influence coefficient and the pre-detection grounding resistance to obtain a pre-detection grounding calibration resistance; adding the real-time influence coefficient of the soil resistance and the real-time grounding reference resistance to obtain a real-time grounding calibration resistance; the absolute value of the difference value between the pre-detection grounding calibration resistor and the real-time grounding calibration resistor is obtained, and the absolute value is set as the grounding resistor change value;
step S402, the absolute value of the difference value between the pre-detection contact potential difference and the contact real-time potential difference is obtained, and the absolute value is set as the contact potential change value; the absolute value of the difference value between the pre-detection stride potential difference and the stride real-time potential difference is obtained, and the absolute value is set as a stride potential change value; obtaining the absolute value of the difference value between the pre-detection transfer potential and the transfer real-time potential, and setting the absolute value as the change value of the transfer potential;
step S4021, a change early warning value is obtained through a change early warning formula from a ground resistance change value, a contact potential change value, a stride potential change value and a transfer potential change value; the change early warning formula is configured as follows: ybh = Bjd ×a1+ Bjc ×a2+ Bkb ×a3+ Bzy ×a4; wherein Ybh is a change early warning value, bjd, bjc, bkb and Bzy are respectively a ground resistance change value, a contact potential change value, a stride potential change value and a transfer potential change value; a1, a2, a3 and a4 are respectively a grounding resistance change early-warning duty cycle, a contact potential change early-warning duty cycle, a stride potential change early-warning duty cycle and a transfer potential change early-warning duty cycle, and a1+a2+a3+a4=1;
step S4022, outputting a high-change early warning signal when the change early warning value is greater than or equal to a first change threshold value; outputting a medium-change early-warning signal when the change early-warning value is larger than or equal to the second change threshold value and smaller than the first change threshold value; and outputting a low-variation early-warning signal when the variation early-warning value is smaller than the second variation threshold value.
The above formulas are all formulas for removing dimensions and taking numerical calculation, the formulas are formulas for obtaining the latest real situation by collecting a large amount of data and performing software simulation, preset parameters in the formulas are set by a person skilled in the art according to the actual situation, if weight coefficients and proportion coefficients exist, the set sizes are specific numerical values obtained by quantizing the parameters, the subsequent comparison is convenient, and the proportional relation between the weight coefficients and the proportion coefficients is not influenced as long as the proportional relation between the parameters and the quantized numerical values is not influenced.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein. The storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as static random access memory (StaticRandom AccessMemory, SRAM), electrically erasable programmable Read-only memory (EEPROM), erasable programmable Read-only memory (EPROM), programmable Read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
The above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A multi-source detection method for a characteristic parameter of a ground network, the detection method comprising the steps of:
step S10, classifying the characteristic parameters of the grounding network to be detected, pre-detecting each characteristic parameter of the grounding network, and setting the characteristic parameters as pre-detection characteristic parameters;
step S20, classifying the environmental parameters of the grounding network to be detected, setting influence parameters for the classified environmental parameters, pre-detecting the influence parameters, and setting the influence parameters as pre-detection influence parameters; the step S20 further includes the following sub-steps:
step S201, dividing the environmental parameters into soil resistance and soil humidity;
step S202, measuring the resistivity of the soil by adopting a tripolar method; measuring soil humidity by adopting a humidity sensor;
step S203, calculating the soil resistivity and the soil humidity through a soil resistance influence formula to obtain a soil resistance influence coefficient, wherein the soil resistance influence formula is configured as follows:
xtd=ρxk1+st×k2; wherein Xtd is a soil resistance influence coefficient, ρ is a soil resistivity, k1 is a soil resistance influence duty factor, st is soil humidity, k2 is a soil humidity duty factor, and the soil resistance influence coefficient is set as a pre-detection influence parameter;
step S30, detecting the characteristic parameter change of the grounding network to be detected in real time, and setting the characteristic real-time parameter; detecting the change of the influence parameters in real time and setting the change as the environment real-time parameters;
step S40, setting the pre-detection characteristic parameter and the pre-detection influence parameter as pre-detection parameters, and setting the characteristic real-time parameter and the environment real-time parameter as real-time detection parameters; analyzing the pre-detection parameters and the real-time detection parameters to obtain a real-time analysis state of the grounding grid, and carrying out grounding grid safety pre-warning based on the real-time analysis state; the step S40 further includes the following sub-steps:
step S4011, adding the soil resistance influence coefficient and the pre-detection grounding resistance to obtain a pre-detection grounding calibration resistance; adding the real-time influence coefficient of the soil resistance and the real-time grounding reference resistance to obtain a real-time grounding calibration resistance; the absolute value of the difference value between the pre-detection grounding calibration resistor and the real-time grounding calibration resistor is obtained, and the absolute value is set as the grounding resistor change value;
step S4012, obtaining an absolute value of a difference between the pre-detected contact potential difference and the contact real-time potential difference, and setting the absolute value as a contact potential change value; the absolute value of the difference value between the pre-detection stride potential difference and the stride real-time potential difference is obtained, and the absolute value is set as a stride potential change value; obtaining the absolute value of the difference value between the pre-detection transfer potential and the transfer real-time potential, and setting the absolute value as the change value of the transfer potential;
step S4021, a change early warning value is obtained through a change early warning formula from a ground resistance change value, a contact potential change value, a stride potential change value and a transfer potential change value; the change early warning formula is configured as follows: ybh = Bjd ×a1+ Bjc ×a2+ Bkb ×a3+ Bzy ×a4; wherein Ybh is a change early warning value, bjd, bjc, bkb and Bzy are respectively a ground resistance change value, a contact potential change value, a stride potential change value and a transfer potential change value; a1, a2, a3 and a4 are respectively a grounding resistance change early-warning duty cycle, a contact potential change early-warning duty cycle, a stride potential change early-warning duty cycle and a transfer potential change early-warning duty cycle, and a1+a2+a3+a4=1;
step S4022, outputting a high-change early warning signal when the change early warning value is greater than or equal to a first change threshold value; outputting a medium-change early-warning signal when the change early-warning value is larger than or equal to the second change threshold value and smaller than the first change threshold value; and outputting a low-variation early-warning signal when the variation early-warning value is smaller than the second variation threshold value.
2. The method for multi-source detection of a characteristic parameter of a ground network according to claim 1, wherein said step S10 comprises the sub-steps of:
step S101, dividing the characteristic parameters of the grounding grid into a grounding resistor, a contact potential difference, a stride potential difference and a transfer potential;
step S102, acquiring a grounding resistor by adopting a voltage and current detection method, acquiring grounding voltage and grounding current, and obtaining the grounding resistor by the grounding voltage and the grounding current through a resistor calculation formula; the resistance calculation formula is configured as follows:wherein R is jd For ground resistance, U jd To the ground voltage, I jd Is the ground current;
step S103, setting a first vertical measurement point and a second vertical measurement point for measuring a contact potential difference, respectively measuring current values at the first vertical measurement point and the second vertical measurement point by using a millivolt meter, respectively setting the first vertical current value and the second vertical current value, obtaining absolute values of differences of the first vertical current value and the second vertical current value, and setting the absolute values as the contact potential difference;
step S104, setting a first horizontal measurement point and a second horizontal measurement point for measuring the stride potential difference, respectively measuring current values at the first horizontal measurement point and the second horizontal measurement point by using a millivolt meter, respectively setting the first horizontal current value and the second horizontal current value, obtaining absolute values of differences of the first horizontal current value and the second horizontal current value, and setting the absolute values as the stride potential difference;
step S105, setting a metal conductor with one end connected with a grounding grid, measuring the ground potential transferred to the grounding grid by the metal conductor, and setting the ground potential as a transfer potential;
step S106, setting the ground resistance, the contact potential difference, the stride potential difference, and the transfer potential detected in steps S102, S103, S104, and S105 to a pre-detection ground resistance, a pre-detection contact potential difference, a pre-detection stride potential difference, and a pre-detection transfer potential, respectively; and the pre-detection grounding resistance, the pre-detection contact potential difference, the pre-detection stride potential difference and the pre-detection transfer potential are set as pre-detection characteristic parameters.
3. The method for multi-source detection of a characteristic parameter of a ground network according to claim 2, wherein said step S30 further comprises the sub-steps of:
step S3011, detecting the characteristic parameter change of the grounding network in real time;
step S3012, acquiring a grounding electrode resistance and a grounding wire resistance by adopting a voltage and current detection method;
the method comprises the steps of obtaining grounding electrode voltage and grounding electrode current, and obtaining grounding electrode resistance through a grounding electrode resistance calculation formula; the ground electrode resistance calculation formula is configured as follows:wherein R is dj U is the resistance of the grounding electrode dj For the voltage of the grounding electrode, I dj Is the current of the grounding electrode;
obtaining ground wire voltage and ground wire current, and obtaining ground wire resistance through a ground wire resistance calculation formula; the ground wire resistance calculation formula is configured as follows:wherein R is dx U is the resistance of the grounding wire dx For the ground line voltage, I dx Is the ground line current;
adding the grounding electrode resistance and the grounding wire resistance to obtain a real-time grounding reference resistance;
step S3013, respectively measuring real-time current values at a first vertical measurement point and a second vertical measurement point by using a millivoltmeter, respectively setting the real-time current values as a first vertical real-time current value and a second vertical real-time current value, obtaining absolute values of differences of the first vertical real-time current value and the second vertical real-time current value, and setting the absolute values as contact real-time potential differences;
step S3014, respectively measuring real-time current values at a first horizontal measurement point and a second horizontal measurement point by using a millivoltmeter, respectively setting the real-time current values as a first horizontal real-time current value and a second horizontal real-time current value, and setting the real-time current values as a stride real-time potential difference by using absolute values of differences of the first horizontal real-time current value and the second horizontal real-time current value;
step S3015, measuring the real-time potential of the grounding network transmitted by the metal conductor, and setting the real-time potential to be transferred;
step S3016, setting the real-time ground reference resistance, the contact real-time potential difference, the stride real-time potential difference, and the transfer real-time potential detected in steps S3012, S3013, S3014, and S3015 as characteristic real-time parameters.
4. A multi-source detection method for a characteristic parameter of a ground network according to claim 3, wherein said step S30 further comprises the sub-steps of:
step S3021, measuring the real-time resistivity of the soil by a tripolar method; measuring the real-time humidity of the soil by adopting a humidity sensor;
step S203, calculating the real-time resistivity and the real-time humidity of the soil through a real-time influence formula of the soil resistance to obtain a real-time influence coefficient of the soil resistance, wherein the real-time influence formula of the soil resistance is configured as follows: xstd=ρs×k1+sst×k2; wherein, xstd is the real-time influence coefficient of soil resistance, ρs is the real-time resistivity of soil, sst is the real-time humidity of soil, and the real-time influence coefficient of soil resistance is set as the real-time parameter of environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310012936.5A CN115902500B (en) | 2023-01-05 | 2023-01-05 | Multi-source detection method for characteristic parameters of grounding network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310012936.5A CN115902500B (en) | 2023-01-05 | 2023-01-05 | Multi-source detection method for characteristic parameters of grounding network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115902500A CN115902500A (en) | 2023-04-04 |
| CN115902500B true CN115902500B (en) | 2024-01-30 |
Family
ID=86491503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310012936.5A Active CN115902500B (en) | 2023-01-05 | 2023-01-05 | Multi-source detection method for characteristic parameters of grounding network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115902500B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034129A (en) * | 2007-02-12 | 2007-09-12 | 湖南大学 | Method and device for online monitoring power station and substation grounding grid |
| US20080265897A1 (en) * | 2005-04-27 | 2008-10-30 | Lee Sang-Mu | Method of Detecting Soil Structure Using Voltage Slope and Measuring Earth Resistance |
| KR20110042157A (en) * | 2011-03-29 | 2011-04-25 | (재) 기초전력연구원 | Apparatus for test site underground wiring earth |
| CN103616582A (en) * | 2013-11-13 | 2014-03-05 | 广东电网公司电力科学研究院 | Multidimensional evaluation method for large-scale grounding grid |
| CN103728511A (en) * | 2013-12-20 | 2014-04-16 | 西安理工大学 | High-voltage direct-current transmission grounding grid state online monitoring system and monitoring method |
| CN106093534A (en) * | 2016-08-08 | 2016-11-09 | 三峡大学 | A kind of method testing earth mat step voltage and contact voltage |
| CN106154047A (en) * | 2016-06-22 | 2016-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of measuring method of Resistance of Grounding Grids |
| CN107561407A (en) * | 2017-08-18 | 2018-01-09 | 国网辽宁省电力有限公司电力科学研究院 | A kind of distributed grounding net of transformer substation detection and appraisal procedure |
| CN110333393A (en) * | 2019-07-05 | 2019-10-15 | 中铁第四勘察设计院集团有限公司 | Traction substation grounded screen data monitoring system and method |
| CN212693878U (en) * | 2020-08-31 | 2021-03-12 | 高政 | Detection system of large-scale comprehensive grounding system |
| CN113504411A (en) * | 2021-06-29 | 2021-10-15 | 合肥工业大学 | Large-scale grounding grid grounding resistance multi-factor evaluation method |
-
2023
- 2023-01-05 CN CN202310012936.5A patent/CN115902500B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080265897A1 (en) * | 2005-04-27 | 2008-10-30 | Lee Sang-Mu | Method of Detecting Soil Structure Using Voltage Slope and Measuring Earth Resistance |
| CN101034129A (en) * | 2007-02-12 | 2007-09-12 | 湖南大学 | Method and device for online monitoring power station and substation grounding grid |
| KR20110042157A (en) * | 2011-03-29 | 2011-04-25 | (재) 기초전력연구원 | Apparatus for test site underground wiring earth |
| CN103616582A (en) * | 2013-11-13 | 2014-03-05 | 广东电网公司电力科学研究院 | Multidimensional evaluation method for large-scale grounding grid |
| CN103728511A (en) * | 2013-12-20 | 2014-04-16 | 西安理工大学 | High-voltage direct-current transmission grounding grid state online monitoring system and monitoring method |
| CN106154047A (en) * | 2016-06-22 | 2016-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of measuring method of Resistance of Grounding Grids |
| CN106093534A (en) * | 2016-08-08 | 2016-11-09 | 三峡大学 | A kind of method testing earth mat step voltage and contact voltage |
| CN107561407A (en) * | 2017-08-18 | 2018-01-09 | 国网辽宁省电力有限公司电力科学研究院 | A kind of distributed grounding net of transformer substation detection and appraisal procedure |
| CN110333393A (en) * | 2019-07-05 | 2019-10-15 | 中铁第四勘察设计院集团有限公司 | Traction substation grounded screen data monitoring system and method |
| CN212693878U (en) * | 2020-08-31 | 2021-03-12 | 高政 | Detection system of large-scale comprehensive grounding system |
| CN113504411A (en) * | 2021-06-29 | 2021-10-15 | 合肥工业大学 | Large-scale grounding grid grounding resistance multi-factor evaluation method |
Non-Patent Citations (3)
| Title |
|---|
| 垂直分层土壤中接地网的结构优化研究;王继来;《电磁避雷器》(第299期);全文 * |
| 大型接地网测试参数分析;车传强;付文光;顾宇宏;燕宝峰;康琪;;内蒙古电力技术(05);全文 * |
| 接地网特性参数现场测量数据有效性评估;周仿荣;马御棠;钱国超;刘红文;颜冰;翟兵;申元;邵建康;;云南电力技术(03);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115902500A (en) | 2023-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cheng et al. | Simulation of a novel capacitive sensor for rebar corrosion detection | |
| CN105510548A (en) | Water quality real-time monitoring system instrument calibration method for complex water environment | |
| US20120043981A1 (en) | Corrosion Monitoring of Concrete Reinforcement Bars (Or Other Buried Corrodable Structures) Using Distributed Node Electrodes | |
| CN108680490A (en) | A kind of steel tower reinforced concrete foundation reinforcement corrosion degree detection device and method | |
| CN103954842A (en) | Method for determining grounding resistance value of large-scale grounding system | |
| CN112881818A (en) | Electric field intensity measuring method, electric field intensity measuring device, computer equipment and storage medium | |
| CN117350216A (en) | Resistance prediction model training method and device, electronic equipment and storage medium | |
| CN107589300A (en) | A kind of line impedance detection method, system, device and readable storage medium storing program for executing | |
| JP2010266342A (en) | Metal corrosion diagnostic method | |
| CN106018505A (en) | Calibration method for concrete chlorine ion content meter | |
| CN115902500B (en) | Multi-source detection method for characteristic parameters of grounding network | |
| Tan et al. | Field and laboratory assessment of electrochemical probes for visualizing localized corrosion under buried pipeline conditions | |
| CN103839009B (en) | A kind of endpoint detection methods and device | |
| RU2641794C1 (en) | Method for determination of technical state of underground pipeline insulating coating | |
| CN112326296A (en) | Sampling method and system suitable for analyzing metallographic structure and Agt performance relation | |
| JP6871497B2 (en) | Electrical corrosion protection status grasping system and status grasping method | |
| JP7346156B2 (en) | Buried steel detection device, buried steel detection method, and buried steel detection program | |
| JP2011158438A (en) | Method for inspecting reinforcement bar corrosion in concrete pole | |
| JP2008249562A (en) | Method for numerically analyzing corrosion or corrosion-proof environment and device | |
| CN114318347B (en) | Cathode protection evaluation method, apparatus, computer device and storage medium | |
| CN110472801B (en) | Electromagnetic environment assessment method and system for direct-current transmission line | |
| CN109974873B (en) | Moving average temperature monitoring method | |
| CN108693164B (en) | Temperature demodulation method, device and system based on optical fiber Raman scattering signal | |
| RU2649630C1 (en) | Method of detection grounding devices corrosion condition | |
| CN118362939B (en) | Method and system for detecting environmental leakage interference in earth resistivity observation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |