CN115221702A - Shared iron tower lightning protection performance evaluation method - Google Patents
Shared iron tower lightning protection performance evaluation method Download PDFInfo
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- CN115221702A CN115221702A CN202210831100.3A CN202210831100A CN115221702A CN 115221702 A CN115221702 A CN 115221702A CN 202210831100 A CN202210831100 A CN 202210831100A CN 115221702 A CN115221702 A CN 115221702A
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Abstract
The application discloses a shared iron tower lightning protection performance evaluation method, which comprises the following steps: acquiring an information set corresponding to the shared iron tower; the shared iron tower comprises a communication base station and an electric power tower, and the information set comprises a grounding mode of a ground network of the shared iron tower, the relative position of the communication base station and the electric power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower and the grounding resistance of the shared iron tower; and evaluating the lightning protection performance of the shared iron tower according to the information set. Based on the method and the device, the lightning protection performance of the shared iron tower can be accurately evaluated by comprehensively considering information such as the grounding mode of the ground net of the shared iron tower, the relative position of the communication base station and the power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower, the grounding resistance of the shared iron tower and the like.
Description
Technical Field
The application relates to the field of shared iron towers, in particular to an evaluation method for lightning protection performance of a shared iron tower.
Background
The shared iron tower is that a communication base station is built on the basis of an electric power tower, namely, the shared iron tower simultaneously comprises the electric power tower and the communication base station. Because the shared iron tower can realize resource integration, national resources are saved, and the number of the shared iron towers is increased increasingly. In the normal use and operation of the shared iron tower, it is essential to ensure the safe and stable operation of the power system and the communication system. And the lightning protection performance shares an important condition of safe and stable operation of the iron tower. Therefore, how to evaluate the lightning protection performance of a shared iron tower so as to better construct the shared iron tower becomes a focus of attention of people.
In summary, there is a need for a method for evaluating lightning protection performance of a shared iron tower, which is used for evaluating the lightning protection performance of a shared iron tower so as to better construct the shared iron tower.
Disclosure of Invention
In view of this, the present application provides an evaluation method for lightning protection performance of a shared iron tower, which is used for evaluating the lightning protection performance of one shared iron tower so as to better construct the shared iron tower.
In order to achieve the above object, the following solutions are proposed:
a method for evaluating lightning protection performance of a shared iron tower comprises the following steps:
acquiring an information set corresponding to the shared iron tower;
the shared iron tower comprises a communication base station and an electric power tower, and the information set comprises a grounding mode of a ground network of the shared iron tower, the relative position of the communication base station and the electric power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower and the grounding resistance of the shared iron tower;
and evaluating the lightning protection performance of the shared iron tower according to the information set.
Optionally, the evaluating, according to the information set, the lightning protection performance of the shared iron tower includes:
judging whether the grounding mode of the shared iron tower grounding grid is joint grounding according to the information set;
if the grounding mode is joint grounding, judging whether the communication base station in the shared iron tower is positioned below the power tower or not according to the information set;
if the communication base station is positioned below the electric power tower, acquiring the ground network potential difference, the upper limit value of the step voltage and the upper limit value of the contact voltage of the electric power tower;
evaluating the lightning protection performance of the shared iron tower according to the ground grid potential difference, the upper limit value of the step voltage and the upper limit value of the contact voltage of the electric power tower;
if the communication base station is positioned above the electric power tower, acquiring the potential difference and the upper limit value of the insulation breakdown voltage at the antenna hanging position of the communication base station and the earth screen of the communication base station;
and evaluating the lightning protection performance of the shared iron tower according to the potential difference at the hanging position of the communication base station earth screen and the antenna of the communication base station and the upper limit value of the insulation breakdown voltage.
Optionally, the evaluating the lightning protection performance of the shared iron tower according to the ground grid potential difference, the upper limit of the step voltage and the upper limit of the contact voltage of the power tower includes:
judging whether the potential difference of the ground grid of the electric power tower is smaller than the upper limit value of the step voltage and the upper limit value of the contact voltage;
if the potential difference of the ground grid of the power tower is smaller than the upper limit value of the step voltage and the upper limit value of the contact voltage, the lightning protection performance of the shared iron tower is determined to be qualified;
and if the potential difference of the ground grid of the electric tower is not less than the upper limit value of the step voltage and/or the upper limit value of the contact voltage, determining that the lightning protection performance of the shared iron tower is unqualified.
Optionally, the evaluating the lightning protection performance of the shared iron tower according to the potential difference at the antenna hanging position of the communication base station and the ground network of the communication base station and the upper limit value of the insulation breakdown voltage includes:
judging whether the potential difference between the ground net of the communication base station and the antenna hanging position of the communication base station is smaller than the upper limit value of the insulation breakdown voltage or not;
if the number of the shared iron tower is smaller than the preset value, the lightning protection performance of the shared iron tower is determined to be qualified;
and if not, determining that the lightning protection performance of the shared iron tower is unqualified.
Optionally, acquiring a ground grid potential difference of the electric power tower includes:
responding to the operation of building a simulation model by a user, and building the simulation model of the shared iron tower;
responding to the operation that a user injects lightning current into the shared iron tower, and injecting the simulated lightning current into a simulation model of the shared iron tower;
and taking the maximum voltage difference of the electric power tower grounding grid in the simulation model of the shared iron tower as the grounding grid potential difference of the electric power tower.
Optionally, the obtaining the upper limit of the step voltage and the upper limit of the contact voltage includes:
acquiring the soil resistivity of the position of the shared iron tower from the information set;
acquiring the power surface layer attenuation coefficient and the duration of fault current of the shared iron tower;
and calculating to obtain the upper limit value of the step voltage and the upper limit value of the contact voltage by using the soil resistivity of the position of the shared iron tower, the power surface layer attenuation coefficient of the shared iron tower and the duration of the fault current, and a preset calculation formula of the upper limit value of the step voltage and the upper limit value of the contact voltage.
Optionally, the obtaining a potential difference between the earth screen of the communication base station and the antenna hanging position of the communication base station includes:
responding to the operation of building a simulation model by a user, and building the simulation model of the shared iron tower;
responding to the operation of injecting lightning current into the shared iron tower by a user, and injecting the simulated lightning current into a simulation model of the shared iron tower;
and calculating the difference between the lowest voltage of the simulation earth screen of the simulation model of the shared iron tower and the voltage of the antenna hanging position of the communication base station, and taking the difference as the potential difference between the common communication base station earth screen and the antenna hanging position of the communication base station.
Optionally, obtaining the upper limit value of the insulation breakdown voltage includes:
acquiring the distance between the electric tower and the antenna hanging position and the relative air density;
and calculating to obtain the upper limit value of the insulation breakdown voltage by using the distance between the electric tower and the antenna hanging position, the relative air density and a calculation formula of a preset upper limit value of the insulation breakdown voltage.
Optionally, after determining whether the grounding mode of the shared iron tower earth net is joint grounding according to the information set, the method further includes:
if the grounding mode of the shared iron tower grounding network is not combined grounding, judging whether the soil resistivity of the position of the shared iron tower is smaller than a preset resistivity threshold value or not according to the information set;
if the soil resistivity is smaller than the preset resistivity threshold, judging whether the grounding resistance of the shared iron tower is smaller than a preset resistance threshold or not according to the information set;
and if the grounding resistance is smaller than the resistance threshold value, determining the lightning protection performance of the shared iron tower to be qualified.
Optionally, the method further includes:
if the soil resistivity is not smaller than the preset resistivity threshold value, determining the lightning protection performance of the shared iron tower to be unqualified;
and if the grounding resistance is not smaller than the resistance threshold value, determining the lightning protection performance of the shared iron tower to be unqualified.
According to the technical scheme, the shared iron tower to be evaluated consists of the communication base station and the electric power tower; considering that lightning current finally flows into the ground through the ground network, the grounding mode of the shared iron tower ground network, the soil resistivity of the position where the shared iron tower is located and the grounding resistance of the shared iron tower can be obtained, and considering that large differences exist between the voltage resistance performances of the power tower and the communication base station, the side emphasis points of the power tower and the communication base station on lightning protection are not consistent, so that the grounding mode of the shared iron tower ground network can be obtained when the lightning protection performance of the shared iron tower is evaluated, and the evaluation mode can be adjusted according to different grounding modes. Based on the above, an information set related to the shared iron tower can be obtained, wherein the information set comprises a grounding mode of a ground network of the shared iron tower, a relative position of a communication base station and an electric power tower in the shared iron tower, a soil resistivity of the position of the shared iron tower and a grounding resistance of the shared iron tower, and the lightning protection performance of the shared iron tower is evaluated according to the information set. Therefore, the method and the device can accurately finish the evaluation of the lightning protection performance of the shared iron tower by comprehensively considering information such as the grounding mode of the ground net of the shared iron tower, the relative position of the communication base station and the power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower, the grounding resistance of the shared iron tower and the like.
In addition, after the shared iron tower lightning protection performance evaluation method is set, the shared iron tower lightning protection performance evaluation method can be referred to when the shared iron tower is constructed, so that a new shared iron tower construction scheme can be better designed, and the shared iron tower which is more scientific, economic and resource-saving in construction can be obtained.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of an evaluation method for lightning protection performance of a shared iron tower disclosed in the present application;
fig. 2 is a flowchart of another method for evaluating lightning protection performance of a shared iron tower disclosed in the present application;
FIG. 3 is a schematic diagram illustrating voltage simulation of a monitoring point of a communication base station earth mat disclosed in the present application;
FIG. 4 is a schematic view showing simulation of voltage at a monitoring point at an antenna hanging position, which is disclosed by the present application
Fig. 5 is a structural block diagram of an evaluation apparatus for lightning protection performance of a shared iron tower disclosed in the present application;
fig. 6 is a block diagram of a hardware structure of an evaluation device for lightning protection performance of a shared iron tower disclosed in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The shared iron tower comprises the power tower and the communication base station, and is equivalent to the power tower, and the communication tower required by the communication base station is replaced on the basis of maintaining power transmission, so that resource integration is realized, and the purpose of saving resources is achieved.
When the shared iron tower is subjected to a lightning strike accident, a large lightning current flows into the ground along the shared iron tower. Due to capacitance inductance and grounding resistance existing on a steel support structure of the shared iron tower, potential differences occur at different positions of the shared iron tower. When the potential difference approaches or reaches the withstand voltage of the communication base station, a part of equipment of the communication base station may break down, causing equipment failure of the communication base station. In addition, when the shared iron tower is subjected to local electric leakage under the influence of lightning stroke, the potential of the shared iron tower is increased, and the personal safety of operation and inspection personnel is threatened. Based on this, the evaluation of the lightning protection performance of the shared iron tower needs to be focused.
Referring to fig. 1, the method for evaluating the lightning protection performance of the shared iron tower of the present application is described in detail, and includes the following steps:
and S1, acquiring an information set corresponding to the shared iron tower.
Specifically, the content of the information set can be obtained through site survey; and the design files of the shared iron tower can be inquired to obtain the information.
The information set may include a grounding mode of a shared iron tower ground network, a relative position of a communication base station and an electric power tower in the shared iron tower, a soil resistivity of a position where the shared iron tower is located, and a grounding resistance of the shared iron tower.
The grounding mode of the shared iron tower grounding network can be joint grounding, namely joint grounding of the communication base station and the power tower, or single grounding, namely direct grounding of the power tower and the communication receiving station, and is not joint.
The relative position of the communication base station and the power tower in the shared iron tower can be that the communication base station is positioned above or below the power tower.
And S2, evaluating the lightning protection performance of the shared iron tower according to the information set.
Specifically, referring to the information set, and combining with industry specifications such as communication station lightning protection and grounding engineering design specifications, and grounding design specifications of an alternating current electrical device, the lightning protection performance of the shared iron tower is comprehensively evaluated.
According to the technical scheme, the shared iron tower to be evaluated consists of the communication base station and the electric power tower; considering that lightning current finally flows into the ground through the ground network, the grounding mode of the shared iron tower ground network, the soil resistivity of the position where the shared iron tower is located and the grounding resistance of the shared iron tower can be obtained, and considering that the voltage endurance performance of the power tower and the communication base station is greatly different, the lateral emphasis of the power tower and the communication base station on lightning protection is inconsistent, so that the grounding mode of the shared iron tower ground network can be obtained when the lightning protection performance of the shared iron tower is evaluated, and the evaluation mode can be adjusted according to different grounding modes. Based on the above, an information set related to the shared iron tower can be obtained, wherein the information set comprises a grounding mode of a ground network of the shared iron tower, a relative position of a communication base station and an electric power tower in the shared iron tower, a soil resistivity of the position of the shared iron tower and a grounding resistance of the shared iron tower, and the lightning protection performance of the shared iron tower is evaluated according to the information set. Based on the method and the device, the lightning protection performance of the shared iron tower can be accurately evaluated by comprehensively considering information such as the grounding mode of the ground net of the shared iron tower, the relative position of the communication base station and the power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower, the grounding resistance of the shared iron tower and the like.
In addition, after the evaluation method for the lightning protection performance of the shared iron tower is set, the evaluation method for the lightning protection performance of the shared iron tower can be referred to when the shared iron tower is constructed, so that a new construction scheme of the shared iron tower can be designed better, and the shared iron tower which is more scientific, economic and resource-saving is constructed.
The lightning protection performance of the shared iron tower can be comprehensively evaluated by combining the industry specifications such as information collection, communication bureau station lightning protection and grounding engineering design specifications and the grounding design specifications of the alternating current electric device, and the reliability and accuracy of the lightning protection performance of the shared iron tower are improved.
Next, a process of evaluating the lightning protection performance of the shared iron tower according to the information set in step S2 will be described in detail with reference to fig. 2, which includes the following specific steps:
and S20, judging whether the grounding mode of the shared iron tower grounding grid is joint grounding or not according to the information set, if so, executing S21, and if not, executing S26.
Specifically, the information set may include a grounding method of the shared iron tower grounding grid, and determine whether the grounding method is joint grounding, if so, execute step S21, otherwise, execute step S26.
And S21, judging whether the communication base station in the shared iron tower is positioned below the power tower or not according to the information set, if so, executing the step S22, and if not, executing the step S24.
Specifically, if the grounding mode is joint grounding, the relative positions of the communication base station and the power tower in the shared iron tower can be directly determined. And when the communication base station in the shared iron tower is positioned below the power tower, executing step S22, and if the communication base station in the shared iron tower is positioned above the power tower, executing step S24.
And S22, acquiring the potential difference of the ground grid of the electric power tower, the upper limit value of the step voltage and the upper limit value of the contact voltage.
Specifically, if the communication base station is located below the power tower, the voltage difference between the ground grid of the communication base station and the hanging position of the antenna generally does not exceed the upper limit of the withstand voltage of the communication equipment, and is generally lower than the upper limit of the insulation breakdown voltage. Based on this, what needs to be focused in the evaluation process at this time is the lightning protection performance of the ground grid of the power tower.
And S23, evaluating the lightning protection performance of the shared iron tower according to the ground network potential difference, the step voltage upper limit value and the contact voltage upper limit value of the power tower.
Specifically, the ground grid potential difference of the power tower can be compared with the upper limit value of the step voltage and the upper limit value of the contact voltage, and the lightning protection performance of the shared iron tower is evaluated according to the comparison result.
The step voltage refers to a voltage difference that the power tower and the ground network can bear, and when the voltage difference of the power tower and the ground network exceeds the upper limit value of the step voltage, the power tower and the ground network are easily damaged.
The contact voltage refers to a voltage difference which can be borne by shared iron tower maintenance personnel when the shared iron tower maintenance personnel contact the shared iron tower, and once the contact voltage is too large, the maintenance personnel are easy to get into danger.
And S24, acquiring the potential difference and the upper limit value of the insulation breakdown voltage at the position where the earth screen of the communication base station is hung with the antenna of the communication base station.
Specifically, when the communication base station is located above the power tower, the potential difference of the ground grid of the power tower generally does not exceed the upper limit value of the step voltage and the upper limit value of the contact voltage. Therefore, the lightning protection performance of the earth screen of the communication base station needs to be focused in the evaluation process.
And S25, evaluating the lightning protection performance of the shared iron tower according to the potential difference of the hanging position of the communication base station grounding grid and the antenna of the communication base station and the upper limit value of the insulation breakdown voltage.
Specifically, the potential difference between the ground grid of the communication base station and the antenna hanging position of the communication base station may be compared with the upper limit value of the insulation breakdown voltage, and the lightning protection performance of the shared iron tower may be evaluated according to the comparison result.
When the potential difference between the grounding grid of the communication base station and the antenna hanging position of the communication base station exceeds the upper limit value of the insulation breakdown voltage, communication equipment is easy to break down, and communication faults are caused.
And S26, judging whether the soil resistivity of the position of the shared iron tower is smaller than a preset resistivity threshold value or not according to the information set, if so, executing the step S27, and if not, executing the step S29.
Specifically, if the grounding mode of the shared iron tower ground network is not joint grounding, it needs to be determined whether the soil resistivity of the position of the shared iron tower meets the lightning protection requirement, if so, step S27 is executed, and if not, step S29 is executed.
The preset resistivity threshold value can be 1000 Ω · m according to the design specification of lightning protection and grounding engineering of the communication station.
And S27, judging whether the grounding resistance of the shared iron tower is smaller than a preset resistance threshold value or not according to the information set, if so, executing the step S28, and if not, executing the step S29.
Specifically, if the soil resistivity is smaller than the preset resistivity threshold, it may be determined whether the ground resistance of the shared iron tower is smaller than a preset resistance threshold, if the ground resistance of the shared iron tower is smaller than the preset resistance threshold, step S28 may be performed, and if the ground resistance of the shared iron tower is larger than the preset resistance threshold, step S29 may be performed.
The resistance threshold may be set according to an industry specification and an actual experience, for example, the resistance threshold may be set in advance by combining a lightning protection and grounding engineering design specification of the communication station and a grounding design specification of the ac electrical device. Typically, the preset resistance threshold may be 20 Ω.
And S28, determining the lightning protection performance of the shared iron tower to be qualified.
Specifically, if the ground resistance is smaller than the resistance threshold, the shared iron tower may be considered to have better lightning protection performance, and the lightning protection performance of the shared iron tower is qualified.
And S29, determining that the lightning protection performance of the shared iron tower is unqualified.
Specifically, if the ground resistance is not less than the resistance threshold, the ground resistance of the shared iron tower is too large, so that a lightning protection fault is likely to occur, and the lightning protection performance of the shared iron tower can be considered as being unqualified.
And S30, determining that the lightning protection performance of the shared iron tower is unqualified.
Specifically, according to the design specifications of lightning protection and grounding engineering of the communication station, if the soil resistivity of the shared iron tower is not less than 1000 Ω · m, the radiation-type horizontal grounding bodies need to be laid at four corners, which can seriously damage the existing ground grid of the shared iron tower, and therefore, when the soil resistivity is not less than the preset resistivity threshold, the lightning protection performance of the shared iron tower can be considered to be unqualified.
According to the technical scheme, the alternative mode for evaluating the lightning protection performance of the shared iron tower according to the information set is provided, and the lightning protection performance of the shared iron tower can be comprehensively evaluated by means of the mode by referring to the industry standard and the actual parameters of the shared iron tower, so that the evaluation process is more reliable, and the evaluation result is more accurate.
In some embodiments of the present application, the process of acquiring the ground potential difference of the electric tower in step S22 is described in detail as follows:
and S220, responding to the operation of a user for building the simulation model, and building the simulation model of the shared iron tower.
Specifically, the information set may further include parameters of the shared iron tower, and after the user starts the simulation model building process, the simulation model of the shared iron tower may be built according to the parameters of the shared iron tower.
Wherein, the simulation software can be CDEGS software.
S221, responding to the operation of a user for injecting lightning current into the shared iron tower in a simulation mode, and injecting the simulated lightning current into the shared iron tower in the simulation mode.
Specifically, because the lightning protection performance is evaluated, lightning current can be injected into a simulation model of the shared iron tower so as to better evaluate the lightning protection performance of the shared iron tower.
S222, taking the maximum voltage difference of the electric power tower grounding grid in the simulation model of the shared iron tower as the grounding grid potential difference of the electric power tower.
Specifically, after lightning current is injected, voltage of each monitoring point of the power tower grounding grid is checked by utilizing Fourier transform analysis in simulation software, the monitoring point of minimum voltage and the monitoring point of maximum voltage are selected, and the voltage difference between the minimum voltage and the maximum voltage is used as grounding grid potential difference.
Since the injection of the lightning current is not a continuous operation, the voltage of each monitoring point fluctuates, and when the earth network potential difference is calculated, the voltage of the wave crest is taken as the standard, namely the voltage difference between the voltage peak value of the monitoring point with the minimum voltage and the voltage peak value of the monitoring point with the maximum voltage is taken as the earth network potential difference.
In order to ensure the accuracy of the earth grid voltage difference, different lightning currents can be injected repeatedly for many times, the process of the earth grid voltage difference is calculated, a plurality of earth grid potential differences are obtained, and the average value of the earth grid potential differences is used as the final earth grid potential difference.
According to the technical scheme, the embodiment provides an optional mode for obtaining the potential difference of the ground grid of the power tower, and the accuracy of the potential difference of the ground grid can be further ensured through the mode, so that the reliability and the accuracy of the lightning protection performance detection of the shared iron tower are ensured.
In some embodiments of the present application, a process of acquiring the upper limit of the step voltage and the upper limit of the contact voltage in step S22 is described in detail, and the steps are as follows:
and S223, acquiring the soil resistivity of the position of the shared iron tower from the information set.
Specifically, the information set comprises the soil resistivity of the position where the shared iron tower is located, and the soil resistivity can be directly obtained from the information set.
S224, obtaining the attenuation coefficient of the power surface layer of the shared iron tower and the duration of the fault current.
Specifically, the information set may further include an electric power surface layer attenuation coefficient of the shared iron tower and a duration of the fault current, and the information set including the electric power surface layer attenuation coefficient of the shared iron tower and the duration of the fault current may be obtained by querying a design file of an electric power tower in the shared iron tower.
And S225, calculating to obtain the upper limit value of the step voltage and the upper limit value of the contact voltage by using the soil resistivity of the position of the shared iron tower, the power surface attenuation coefficient of the shared iron tower and the duration of the fault current, and a preset calculation formula of the upper limit value of the step voltage and the upper limit value of the contact voltage.
Specifically, the calculation formula of the upper limit value of the contact voltage is as follows:
the calculation formula of the upper limit value of the step voltage is as follows:
wherein, U t Is the upper limit value of the contact voltage, and the unit is v; u shape s The step voltage upper limit value is in v; ρ is a unit of a gradient s The unit of the soil resistivity of the position where the shared iron tower is located is omega m; c s Sharing the power surface attenuation coefficient of the iron tower; t is t s The duration of the fault current is in units of S.
It can be seen from the foregoing technical solutions that the present embodiment provides a selectable manner for acquiring the upper limit of the step voltage and the upper limit of the contact voltage. By the method, the upper limit value of the step voltage and the upper limit value of the contact voltage can be obtained through comprehensive calculation of soil resistivity, current surface layer attenuation coefficient, fault current duration and the like, so that the upper limit value of the step voltage and the upper limit value of the contact voltage have reference significance, and the shared iron tower lightning protection performance is more reliably evaluated.
In some embodiments of the present application, a detailed description is given to the process of evaluating the lightning protection performance of the shared iron tower according to the ground grid potential difference, the step voltage upper limit value, and the contact voltage upper limit value of the power tower in step S23, where the steps are as follows:
and S230, judging whether the potential difference of the ground grid of the electric power tower is smaller than the step voltage upper limit value and the contact voltage upper limit value, if so, executing a step S231, and if not, executing a step S232.
Specifically, the potential difference of the ground grid can be compared with the calculated upper limit value of the step voltage and the upper limit value of the contact voltage of the power tower.
S231, determining the lightning protection performance of the shared iron tower to be qualified.
Specifically, if the potential difference of the ground grid of the power tower is smaller than both the upper limit of the step voltage and the upper limit of the contact voltage, the lightning protection performance of the shared iron tower can be considered to be better.
And S232, determining the lightning protection performance of the shared iron tower to be unqualified.
Specifically, if the potential difference of the ground grid of the power tower is not less than the upper limit of the step voltage and/or the upper limit of the contact voltage, the lightning protection performance of the shared iron tower is considered to be poor.
According to the technical scheme, the embodiment provides an optional mode for evaluating the lightning protection performance of the shared iron tower according to the ground grid potential difference, the upper limit value of the step voltage and the upper limit value of the contact voltage of the electric power tower, the upper limit value of the step voltage and the upper limit value of the contact voltage are taken as reference standards, the equipment safety problem and the maintenance personnel safety problem during lightning injection are considered, and the safety of the shared iron tower is further ensured.
In some embodiments of the present application, a detailed description is given of the process of acquiring the potential difference between the earth screen of the communication base station and the antenna suspension location of the communication base station in step S24, where the steps are as follows:
s240, responding to the operation of building the simulation model by the user, and building the simulation model of the shared iron tower.
Specifically, a simulation model of the shared iron tower, which needs to be subjected to lightning protection performance evaluation, can be constructed in simulation software.
And S241, responding to the operation of injecting lightning current into the shared iron tower by a user, and injecting the simulated lightning current into the simulation model of the shared iron tower.
Specifically, lightning current may be injected into the simulation model of the shared iron tower multiple times.
And S242, calculating a difference value between the lowest voltage of the simulation grounding grid of the simulation model of the shared iron tower and the voltage of the antenna hanging position of the communication base station, and taking the difference value as a potential difference between the grounding grid of the common communication base station and the antenna hanging position of the communication base station.
When calculating the voltage difference between the communication base station earth screen and the antenna hanging position, checking the voltage of each monitoring point in the communication base station earth screen, and selecting the monitoring point with the minimum voltage; and checking the voltage of each monitoring point at the antenna hanging position, and selecting the monitoring point with the maximum voltage.
The voltage waveform of the monitoring point with the minimum voltage, as shown in fig. 3 and the voltage waveform of the monitoring point with the maximum voltage, as shown in fig. 4, can be obtained by adopting fourier transform analysis, and the instantaneous changes of the potentials at the grounding grid and the antenna hanging position of the communication base station in the simulation model of the shared iron tower are caused after lightning current is injected, so that the difference between the peak values of the voltage waveforms can be calculated, namely, the difference between the peak value of the voltage waveform corresponding to the monitoring point with the minimum voltage and the peak value of the voltage waveform corresponding to the monitoring point with the maximum voltage can be calculated.
As shown in fig. 3 and 4, the voltage at each monitoring point rises sharply and falls sharply when the lightning current is injected, and finally returns gently.
According to the technical scheme, the embodiment provides an optional mode for collecting the potential difference at the hanging position of the antenna of the communication base station and the ground network of the communication base station, and the collected potential difference can be more referential, so that the lightning protection performance evaluation result is more accurate and more reliable.
In some embodiments of the present application, a process of acquiring the upper limit value of the insulation breakdown voltage in step S24 is described in detail, and the steps are as follows:
and S243, obtaining the distance between the electric tower and the antenna hanging position and the relative air density.
Specifically, the information set may include a distance between the power tower and the antenna hanging location and a relative air density, and the information set may be obtained by on-site survey when the information set of the distance between the power tower and the antenna hanging location and the relative air density is obtained; and the method can also be obtained by inquiring design files of the shared iron tower.
And S244, calculating to obtain the upper limit value of the insulation breakdown voltage by using the distance between the electric tower and the antenna hanging position, the relative air density and a preset calculation formula of the upper limit value of the insulation breakdown voltage.
Specifically, the calculation formula of the upper limit value of the insulation breakdown voltage is as follows:
wherein, U d The upper limit value of the insulation breakdown voltage is expressed in kv; d is the distance between the electric power tower and the antenna hanging position, and the unit is cm; sigma is relative air density, and is generally 0.75 × 10 -3 。
According to the technical scheme, the embodiment provides an optional mode for calculating the upper limit value of the insulation breakdown voltage, and the upper limit value of the insulation breakdown voltage can be calculated by referring to the height difference between the power tower and the antenna hanging company of the shared iron tower and the relative air density so as to improve the reliability of the lightning protection performance of the shared iron tower.
In some embodiments of the present application, a detailed description is given of the process of evaluating the lightning protection performance of the shared iron tower according to the potential difference between the ground grid of the communication base station and the antenna hanging position of the communication base station and the upper limit value of the insulation breakdown voltage in step S25, where the steps are as follows:
and S250, judging whether the potential difference between the grounding network of the communication base station and the antenna hanging position of the communication base station is smaller than the upper limit value of the insulation breakdown voltage, if so, executing the step S251, and if not, executing the step S252.
And S251, determining the lightning protection performance of the shared iron tower is qualified.
Specifically, when the potential difference between the ground grid of the communication base station and the antenna hanging position of the communication base station is smaller than the upper limit value of the insulation breakdown voltage, the lightning protection performance of the shared iron tower is considered to be better.
And S252, determining the lightning protection performance of the shared iron tower to be unqualified.
Specifically, when the potential difference between the ground grid of the communication base station and the antenna hanging position of the communication base station is not less than the upper limit value of the insulation breakdown voltage, the lightning protection performance of the shared iron tower is considered to be poor.
As can be seen from the foregoing technical solutions, the present embodiment provides an optional manner for evaluating the lightning protection performance of the shared iron tower according to the potential difference between the communications base station ground grid and the antenna suspension location of the communications base station and the upper limit value of the insulation breakdown voltage.
The device for evaluating the lightning protection performance of the shared iron tower provided in the embodiment of the present application is described in detail below, and the device for evaluating the lightning protection performance of the shared iron tower and the method for evaluating the lightning protection performance of the shared iron tower in the following description may be referred to in a corresponding manner.
Referring to fig. 5, the apparatus for evaluating lightning protection performance of a shared iron tower may include:
the acquisition unit 1 is used for acquiring an information set corresponding to the shared iron tower;
and the evaluation unit 2 is used for evaluating the lightning protection performance of the shared iron tower according to the information set.
Further, the evaluation unit may include:
the joint grounding judgment unit is used for judging whether the grounding mode of the shared iron tower grounding grid is joint grounding according to the information set;
the relative position judging unit is used for judging whether the communication base station in the shared iron tower is positioned below the power tower or not according to the information set if the grounding mode is combined grounding;
the ground network potential difference acquisition unit is used for acquiring the ground network potential difference, the step voltage upper limit value and the contact voltage upper limit value of the power tower if the communication base station is positioned below the power tower;
the ground grid potential difference utilization unit is used for evaluating the lightning protection performance of the shared iron tower according to the ground grid potential difference, the step voltage upper limit value and the contact voltage upper limit value of the electric power tower;
the upper limit value acquisition unit is used for acquiring the potential difference and the upper limit value of the insulation breakdown voltage at the antenna hanging position of the communication base station and the ground network of the communication base station if the communication base station is positioned above the electric power tower;
and the upper limit value utilizing unit is used for evaluating the lightning protection performance of the shared iron tower according to the potential difference of the hanging position of the communication base station grounding grid and the antenna of the communication base station and the upper limit value of the insulation breakdown voltage.
Further, the ground net potential difference utilizing unit may include:
the first ground grid potential difference utilization unit is used for judging whether the ground grid potential difference of the electric power tower is smaller than the step voltage upper limit value and the contact voltage upper limit value or not;
the second ground grid potential difference utilization unit is used for determining that the lightning protection performance of the shared iron tower is qualified if the ground grid potential difference of the electric power tower is smaller than the step voltage upper limit value and the contact voltage upper limit value;
and the third ground network potential difference utilizing unit is used for determining that the lightning protection performance of the shared iron tower is unqualified if the ground network potential difference of the electric power tower is not smaller than the step voltage upper limit value and/or the contact voltage upper limit value.
Further, the evaluation unit may further include:
the soil resistivity comparison unit is used for judging whether the soil resistivity of the shared iron tower is smaller than a preset resistivity threshold value or not according to the information set if the grounding mode of the shared iron tower ground net is not combined grounding;
the grounding resistance comparison unit is used for judging whether the grounding resistance of the shared iron tower is smaller than a preset resistance threshold value or not according to the information set if the soil resistivity is smaller than the preset resistivity threshold value;
and the qualification determination unit is used for determining that the lightning protection performance of the shared iron tower is qualified if the grounding resistance is smaller than the resistance threshold value.
Further, the evaluation unit may further include:
the resistivity threshold utilizing unit is used for determining that the lightning protection performance of the shared iron tower is unqualified if the soil resistivity is not less than the preset resistivity threshold;
and the grounding resistance utilization unit is used for determining that the lightning protection performance of the shared iron tower is unqualified if the grounding resistance is not less than the resistance threshold value.
Further, the upper limit value utilization unit may include:
a first upper limit value utilizing unit, configured to determine whether a potential difference at an antenna hanging position of the communication base station and the ground grid of the communication base station is smaller than an upper limit value of the insulation breakdown voltage;
the second upper limit value utilizing unit is used for determining that the lightning protection performance of the shared iron tower is qualified if the potential difference between the ground grid of the communication base station and the antenna hanging position of the communication base station is smaller than the upper limit value of the insulation breakdown voltage;
and the third upper limit value utilization unit is used for determining that the lightning protection performance of the shared iron tower is unqualified if the potential difference between the ground grid of the communication base station and the antenna hanging position of the communication base station is not less than the upper limit value of the insulation breakdown voltage.
Further, the ground net potential difference acquiring unit may include:
the model building unit is used for responding to the operation of building a simulation model by a user and building the simulation model of the shared iron tower;
the lightning current injection unit is used for responding to the operation of injecting lightning current into the shared iron tower by a user and injecting the simulated lightning current into a simulation model of the shared iron tower;
and the maximum voltage difference acquisition unit is used for taking the maximum voltage difference of the electric power tower grounding grid in the simulation model of the shared iron tower as the grounding grid potential difference of the electric power tower.
Further, the ground net potential difference acquiring unit may include:
the soil resistivity acquisition unit is used for acquiring the soil resistivity of the position of the shared iron tower from the information set;
the duration obtaining unit is used for obtaining the attenuation coefficient of the electric surface layer of the shared iron tower and the duration of the fault current;
and the soil resistivity utilization unit is used for calculating and obtaining the upper limit value of the step voltage and the upper limit value of the contact voltage by utilizing the soil resistivity of the position of the shared iron tower, the power surface attenuation coefficient of the shared iron tower and the duration of the fault current as well as a preset calculation formula of the upper limit value of the step voltage and the upper limit value of the contact voltage.
Further, the upper limit value acquisition unit may include:
the shared iron tower simulation unit is used for responding to the operation of a user for constructing a simulation model and constructing the simulation model of the shared iron tower;
the lightning current simulation unit is used for responding to the operation that a user injects lightning current into the shared iron tower and injecting the simulated lightning current into a simulation model of the shared iron tower;
and the difference value calculating unit is used for calculating the difference value between the lowest voltage of the simulation earth screen of the simulation model of the shared iron tower and the voltage at the antenna hanging position of the communication base station, and taking the difference value as the potential difference between the common communication base station earth screen and the antenna hanging position of the communication base station.
Further, the upper limit value acquisition unit may include:
the distance acquisition unit is used for acquiring the distance between the electric tower and the antenna hanging position and the relative air density;
and the distance utilization unit is used for calculating the upper limit value of the insulation breakdown voltage by utilizing the distance between the electric tower and the antenna hanging position, the relative air density and a preset calculation formula of the upper limit value of the insulation breakdown voltage.
The device for evaluating the lightning protection performance of the shared iron tower provided by the embodiment of the application can be applied to evaluation equipment of the lightning protection performance of the shared iron tower, such as a PC terminal, a cloud platform, a server cluster and the like. Optionally, fig. 6 shows a block diagram of a hardware structure of the equipment for evaluating lightning protection performance of the shared iron tower, and referring to fig. 6, the hardware structure of the equipment for evaluating lightning protection performance of the shared iron tower may include: at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4;
in the embodiment of the application, the number of the processor 1, the communication interface 2, the memory 3 and the communication bus 4 is at least one, and the processor 1, the communication interface 2 and the memory 3 complete mutual communication through the communication bus 4;
the processor 1 may be a central processing unit CPU, or an Application Specific Integrated Circuit ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement embodiments of the present invention, etc.;
the memory 3 may include a high-speed RAM memory, and may further include a non-volatile memory (non-volatile memory) or the like, such as at least one disk memory;
wherein the memory stores a program and the processor can call the program stored in the memory, the program for:
acquiring an information set corresponding to the shared iron tower;
the shared iron tower comprises a communication base station and an electric power tower, and the information set comprises a grounding mode of a ground network of the shared iron tower, the relative position of the communication base station and the electric power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower and the grounding resistance of the shared iron tower;
and evaluating the lightning protection performance of the shared iron tower according to the information set.
Alternatively, the detailed function and the extended function of the program may refer to the above description.
Embodiments of the present application further provide a readable storage medium, which may store a program adapted to be executed by a processor, where the program is configured to:
acquiring an information set corresponding to the shared iron tower;
the shared iron tower comprises a communication base station and an electric power tower, and the information set comprises a grounding mode of a ground network of the shared iron tower, the relative position of the communication base station and the electric power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower and the grounding resistance of the shared iron tower;
and evaluating the lightning protection performance of the shared iron tower according to the information set.
Alternatively, the detailed function and the extended function of the program may refer to the above description.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. The various embodiments of the present application may be combined with each other. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for evaluating lightning protection performance of a shared iron tower is characterized by comprising the following steps:
acquiring an information set corresponding to the shared iron tower;
the shared iron tower comprises a communication base station and an electric power tower, and the information set comprises a grounding mode of a ground grid of the shared iron tower, the relative position of the communication base station and the electric power tower in the shared iron tower, the soil resistivity of the position of the shared iron tower and the grounding resistance of the shared iron tower;
and evaluating the lightning protection performance of the shared iron tower according to the information set.
2. The method for evaluating the lightning protection performance of the shared iron tower according to claim 1, wherein the evaluating the lightning protection performance of the shared iron tower according to the information set comprises:
judging whether the grounding mode of the shared iron tower grounding grid is joint grounding according to the information set;
if the grounding mode is combined grounding, judging whether the communication base station in the shared iron tower is positioned below the power tower or not according to the information set;
if the communication base station is positioned below the electric power tower, acquiring the ground network potential difference, the upper limit value of the step voltage and the upper limit value of the contact voltage of the electric power tower;
evaluating the lightning protection performance of the shared iron tower according to the ground network potential difference, the step voltage upper limit value and the contact voltage upper limit value of the power tower;
if the communication base station is positioned above the electric power tower, acquiring the potential difference and the upper limit value of the insulation breakdown voltage at the position where the ground grid of the communication base station is hung on the antenna of the communication base station;
and evaluating the lightning protection performance of the shared iron tower according to the potential difference of the hanging position of the communication base station grounding grid and the antenna of the communication base station and the upper limit value of the insulation breakdown voltage.
3. The method for evaluating the lightning protection performance of the shared iron tower according to claim 2, wherein the step voltage upper limit value and the contact voltage upper limit value of the power tower are used for evaluating the lightning protection performance of the shared iron tower, and the method comprises the following steps:
judging whether the potential difference of the ground grid of the electric power tower is smaller than the upper limit value of the step voltage and the upper limit value of the contact voltage;
if the potential difference of the ground grid of the electric tower is smaller than the upper limit value of the step voltage and the upper limit value of the contact voltage, the lightning protection performance of the shared iron tower is determined to be qualified;
and if the potential difference of the ground grid of the electric tower is not less than the upper limit value of the step voltage and/or the upper limit value of the contact voltage, determining that the lightning protection performance of the shared iron tower is unqualified.
4. The method for evaluating the lightning protection performance of the shared iron tower according to claim 2, wherein the step of evaluating the lightning protection performance of the shared iron tower according to the potential difference between the ground grid of the communication base station and the antenna hanging position of the communication base station and the upper limit value of the insulation breakdown voltage comprises the following steps:
judging whether the potential difference between the ground net of the communication base station and the antenna hanging position of the communication base station is smaller than the upper limit value of the insulation breakdown voltage or not;
if the number of the shared iron tower is smaller than the preset number, the lightning protection performance of the shared iron tower is determined to be qualified;
and if not, determining the lightning protection performance of the shared iron tower is unqualified.
5. The method for evaluating the lightning protection performance of the shared iron tower according to claim 2, wherein acquiring the potential difference of the earth grid of the power tower comprises:
responding to the operation of building a simulation model by a user, and building the simulation model of the shared iron tower;
responding to the operation of injecting lightning current into the shared iron tower by a user, and injecting the simulated lightning current into a simulation model of the shared iron tower;
and taking the maximum voltage difference of the electric power tower grounding grid in the simulation model of the shared iron tower as the grounding grid potential difference of the electric power tower.
6. The method for evaluating lightning protection performance of a shared iron tower according to claim 2, wherein the step voltage upper limit and the contact voltage upper limit are obtained by:
acquiring the soil resistivity of the position of the shared iron tower from the information set;
acquiring the attenuation coefficient of the electric surface layer of the shared iron tower and the duration of fault current;
and calculating to obtain the upper limit value of the step voltage and the upper limit value of the contact voltage by using the soil resistivity of the position of the shared iron tower, the power surface layer attenuation coefficient of the shared iron tower and the duration of the fault current, and a preset calculation formula of the upper limit value of the step voltage and the upper limit value of the contact voltage.
7. The method for evaluating the lightning protection performance of the shared iron tower according to claim 2, wherein obtaining the potential difference between the earth screen of the communication base station and the antenna hanging position of the communication base station comprises:
responding to the operation of building a simulation model by a user, and building the simulation model of the shared iron tower;
responding to the operation of injecting lightning current into the shared iron tower by a user, and injecting the simulated lightning current into a simulation model of the shared iron tower;
and calculating the difference between the lowest voltage of the simulation earth screen of the simulation model of the shared iron tower and the voltage of the antenna hanging position of the communication base station, and taking the difference as the potential difference between the common communication base station earth screen and the antenna hanging position of the communication base station.
8. The method for evaluating the lightning protection performance of the shared iron tower according to claim 2, wherein the obtaining of the upper limit value of the insulation breakdown voltage comprises:
acquiring the distance between the electric tower and the antenna hanging position and the relative air density;
and calculating to obtain the upper limit value of the insulation breakdown voltage by using the distance between the electric tower and the antenna hanging position, the relative air density and a calculation formula of a preset upper limit value of the insulation breakdown voltage.
9. The method for evaluating the lightning protection performance of the shared iron tower according to claim 2, wherein after determining whether the grounding mode of the grounding network of the shared iron tower is joint grounding according to the information set, the method further comprises:
if the grounding mode of the shared iron tower ground net is not combined grounding, judging whether the soil resistivity of the position of the shared iron tower is smaller than a preset resistivity threshold value or not according to the information set;
if the soil resistivity is smaller than the preset resistivity threshold, judging whether the grounding resistance of the shared iron tower is smaller than a preset resistance threshold or not according to the information set;
and if the grounding resistance is smaller than the resistance threshold value, determining the lightning protection performance of the shared iron tower to be qualified.
10. The method for evaluating the lightning protection performance of the shared iron tower according to claim 9, further comprising:
if the soil resistivity is not smaller than the preset resistivity threshold value, determining the lightning protection performance of the shared iron tower to be unqualified;
and if the grounding resistance is not smaller than the resistance threshold value, determining the lightning protection performance of the shared iron tower to be unqualified.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210831100.3A CN115221702A (en) | 2022-07-15 | 2022-07-15 | Shared iron tower lightning protection performance evaluation method |
| PCT/CN2022/123205 WO2024011763A1 (en) | 2022-07-15 | 2022-09-30 | Method for evaluating lightning protection performance of shared tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210831100.3A CN115221702A (en) | 2022-07-15 | 2022-07-15 | Shared iron tower lightning protection performance evaluation method |
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| CN115221702A true CN115221702A (en) | 2022-10-21 |
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| CN202210831100.3A Pending CN115221702A (en) | 2022-07-15 | 2022-07-15 | Shared iron tower lightning protection performance evaluation method |
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| CN (1) | CN115221702A (en) |
| WO (1) | WO2024011763A1 (en) |
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|---|---|---|---|---|
| WO2011029314A1 (en) * | 2009-09-08 | 2011-03-17 | 广东电网公司深圳供电局 | Method for vertically grounding and leading-down from inner side of composite material pole tower and pole tower thereof |
| CN111506983A (en) * | 2020-03-19 | 2020-08-07 | 中国电力科学研究院有限公司 | Method and system for determining lightning protection performance of shared tower |
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- 2022-09-30 WO PCT/CN2022/123205 patent/WO2024011763A1/en unknown
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