CN115292861A - Shared iron tower ground net design method and system considering soil resistivity - Google Patents
Shared iron tower ground net design method and system considering soil resistivity Download PDFInfo
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Abstract
The invention provides a shared iron tower ground net design method and system considering soil resistivity, relating to the technical field of high-voltage lightning protection and comprising the following steps: acquiring the soil resistivity of the area where the shared iron tower is located; determining whether the shared iron tower ground net needs to be connected with an external net or not according to the soil resistivity; when the shared iron tower earth net needs to be connected with an external net, connecting the tower earth net and a communication machine room earth net to obtain an initial updating earth net of the shared iron tower; determining the resistance of the shared iron tower initial updating ground net as a first resistance according to the soil resistivity and the area of the shared iron tower initial updating ground net; and expanding the shared iron tower according to the first resistance to initially update the earth screen to obtain the expanded shared iron tower earth screen. According to the invention, different ground net arrangement schemes are set based on the soil resistivity, so that the ground current enters the ground from the side of the tower ground net under the condition of lightning stroke, and the surge interference is reduced.
Description
Technical Field
The invention relates to the technical field of high-voltage lightning protection, in particular to a shared iron tower ground net design method and system considering soil resistivity.
Background
The power and communication sharing iron tower (referred to as a sharing iron tower for short) is that communication equipment is additionally arranged on the power iron tower (also referred to as a pole tower), and communication facilities such as optical cables or mobile antennas are attached to a power transmission iron tower body, so that power and communication infrastructure resource sharing is realized. The shared iron tower has great popularization value and wide application prospect, so that research on related technologies for ensuring safe and reliable operation of the shared iron tower is very necessary. YD5098-2005 "communication bureau (station) lightning protection and grounding engineering design Specification" stipulates that when the resistivity of the soil in the area of the communication base station is lower than 1000 Ω · m, the power frequency grounding resistance of the base station ground network is preferably controlled within 10 Ω. The power frequency grounding resistance of the non-grounded wire of the line tower with the grounded wire specified in the design specification of the overhead transmission line GB 50545-2010 110kV-750 kV is shown in Table 1.
Table 1 power frequency earthing resistance meter with earth wire for line tower not connecting with earth wire
| Soil resistivity (omega. M) | ≤100 | 100～500 | 500～1000 |
| Power frequency grounding resistor (omega) | 10 | 15 | 20 |
In actual use, the aim of lightning protection is fulfilled by connecting the iron tower grounding network with the communication base station grounding network to form a grounding network. GB50689-2011 lightning protection and grounding engineering design Specification of communication bureau (station) requires: the mobile base station ground net comprises a machine room ground net and an iron tower ground net (or comprises the machine room ground net, the iron tower ground net and a transformer ground net). When the iron tower is positioned beside the machine room, the iron tower ground net is formed by welding and communicating metal components inside four tower legs of an iron tower foundation by using 40mm multiplied by 4m hot galvanizing flat steel, and the grid size of the iron tower ground net is not larger than 3m multiplied by 3m. The iron tower grounding net and the machine room grounding net are welded and communicated once every 3-5 m, and the number of connecting points is not less than two. When the four corners of the iron tower contain a machine room, the grounding system utilizes an annular grounding grid arranged outside the four corners of the iron tower as a grounding device, and the area of the grounding grid is larger than 15m multiplied by 15m. The grounding resistance value of the base station grounding grid is not larger than 10 omega. In the area with soil resistivity greater than 1000 omega.m, the power frequency ground resistance of the base station is not limited, the equivalent radius of the ground grid is greater than 10m, and hot galvanized flat steel with the thickness of 10 m-20 m is laid at the four corners of the ground grid to serve as a radiation type grounding body.
It can be seen from the current standard that when the soil resistivity is higher than 100 Ω · m, the tower ground resistance is higher than the ground resistance required by the communication base station. In order to meet the requirement that the grounding resistance of the communication base station is lower than 10 ohms, the newly-built communication base station grounding grid is connected with the original tower grounding grid under the condition that the tower grounding resistance is higher than 10 ohms, and the grounding resistance lower than 10 ohms is achieved. The communication base station is low in erection height, and the communication base station built near a tower does not have the condition that lightning current hits a communication antenna or a communication machine room, but the condition can cause that: lightning current enters the ground along a pole tower, large potential difference exists at two ends of an antenna feeder cable between a relatively long antenna and a communication base station, meanwhile, two relatively independent ground grids are intersected, and potential distribution of an original complete ground grid is difficult to accurately evaluate. The increase of the potential difference in case of a lightning strike also has drawbacks: the surge voltage is difficult to estimate, and the limit value of the surge protector is inconvenient to design; the difference of the two earth grids in shunt can cause lightning current to gather to one side of the earth grid of the communication base station, and the risk of surge overvoltage of the communication base station is increased.
Disclosure of Invention
The invention aims to provide a shared iron tower ground network design method and system considering soil resistivity, which can determine a ground network arrangement scheme based on the soil resistivity, so that ground current enters the ground from the side of a tower ground network under the condition of lightning stroke, and the surge interference is reduced.
In order to achieve the purpose, the invention provides the following scheme:
a shared iron tower ground net design method considering soil resistivity comprises the following steps:
acquiring the soil resistivity of the area where the shared iron tower is located;
determining whether the shared iron tower ground net needs to be connected with an external net or not according to the soil resistivity; the shared iron tower ground net comprises a tower ground net and a communication machine room ground net;
when the shared iron tower earth net needs to be connected with an external net, connecting the tower earth net and the communication machine room earth net to obtain an initial updating earth net of the shared iron tower;
determining the resistance of the shared iron tower initial updating ground net as a first resistance according to the soil resistivity and the area of the shared iron tower initial updating ground net;
and expanding the shared iron tower initial updating earth screen according to the first resistance to obtain the expanded shared iron tower earth screen.
Optionally, the determining, according to the soil resistivity, whether the shared iron tower ground net needs to be connected with an external net includes:
judging whether the soil resistivity is larger than a soil resistivity threshold value or not to obtain a first judgment result;
if the first judgment result is yes, the shared iron tower earth net needs to be connected with an external net;
and if the first judgment result is negative, the shared iron tower ground net does not need to be connected with an external net.
Optionally, the first resistor is:
wherein R1 represents a first resistance; ρ represents the soil resistivity; and S1 represents the area of the shared iron tower for initially updating the ground grid.
Optionally, the expanding the shared iron tower initial update earth mat according to the first resistance to obtain an expanded shared iron tower earth mat includes:
judging whether the resistance of the initially updated grounding grid of the shared iron tower is smaller than a resistance threshold value or not to obtain a second judgment result;
if the second judgment result is yes, determining that the distance between the tower and the ground net center of the communication machine room is a standard distance;
judging whether the standard distance is smaller than a distance threshold value or not to obtain a third judgment result;
if the third judgment result is yes, determining the shared iron tower initial updating ground net as an expanded shared iron tower ground net;
if the third judgment result is negative, expanding the tower and ground net in the opposite direction of the communication machine room and taking the tower and ground net as a center and the standard distance as an expansion length to obtain an expanded shared iron tower and ground net;
if the second judgment result is negative, a formula is utilized according to the first resistance
Calculating the resistance of the expanded shared iron tower grounding grid as a second resistance; r2 represents a second resistance;
according to the second resistance and the soil resistivity, using a formula
Determining the area of the expanded shared iron tower ground net; s represents the area of the expanded shared iron tower ground net;
according to the area of the expanded shared iron tower ground net, a formula is utilized
Determining the side length of the expanded shared iron tower ground net; d represents the side length of the expanded shared iron tower ground net;
and expanding the shared iron tower initial updating ground net according to the side length to obtain the expanded shared iron tower ground net.
A shared iron tower earth mat design system considering soil resistivity, comprising:
the soil resistivity acquisition module is used for acquiring the soil resistivity of the area where the shared iron tower is located;
the external network connection determining module is used for determining whether the shared iron tower ground network needs to be connected with an external network according to the soil resistivity; the shared iron tower ground net comprises a tower ground net and a communication machine room ground net;
the shared iron tower ground net updating module is used for connecting the tower ground net and the communication machine room ground net to obtain an initial updated ground net of the shared iron tower when the shared iron tower ground net needs to be connected with an external net;
the first resistance determining module is used for determining the resistance of the shared iron tower initial updating ground net as a first resistance according to the soil resistivity and the area of the shared iron tower initial updating ground net;
and the shared iron tower ground grid expansion module is used for expanding the shared iron tower to initially update the ground grid according to the first resistance to obtain the expanded shared iron tower ground grid.
Optionally, the extranet connection determining module includes:
the first judgment unit is used for judging whether the soil resistivity is greater than a soil resistivity threshold value or not to obtain a first judgment result; if the first judgment result is yes, calling a first external network judgment unit; if the first judgment result is negative, calling a second external network judgment unit;
the first external network judging unit is used for judging that the shared iron tower earth net needs to be connected with an external network;
and the second external network judging unit is used for judging that the shared iron tower earth net does not need to be connected with an external network.
Optionally, the first resistor is:
wherein R1 represents a first resistance; ρ represents the soil resistivity; s1 represents the area of the shared iron tower for initially updating the earth screen.
Optionally, the shared iron tower ground grid extension module includes:
the second judgment unit is used for judging whether the resistance of the initially updated grounding grid of the shared iron tower is smaller than a resistance threshold value or not to obtain a second judgment result; if the second judgment result is yes, calling a standard distance determination unit; if the second judgment result is negative, calling a second resistance determining unit;
the standard distance determining unit is used for determining that the distance between the center of the tower grounding grid and the center of the grounding grid of the communication machine room is a standard distance;
the third judging unit is used for judging whether the standard distance is smaller than a distance threshold value or not to obtain a third judging result; if the third judgment result is yes, calling a first shared iron tower ground network expansion unit; if the third judgment result is negative, calling a second shared iron tower ground network expansion unit;
the first shared iron tower ground net expansion unit is used for determining the shared iron tower initial updating ground net as an expanded shared iron tower ground net;
the second shared iron tower earth screen expanding unit is used for expanding the tower earth screen to the opposite direction of the earth screen of the communication machine room by taking the tower earth screen as the center and the standard distance as the expanding length to obtain the expanded shared iron tower earth screen;
a second resistance determination unit for determining the first resistance according to the formula
Calculating the resistance of the expanded shared iron tower grounding grid as a second resistance; r2 represents a second resistance;
an area determination unit for utilizing a formula based on the second resistance and the soil resistivity
Determining the area of the expanded shared iron tower ground net; s represents the area of the expanded shared iron tower ground net;
a side length determining unit for utilizing a formula according to the area of the expanded shared iron tower ground net
Determining the side length of the expanded shared iron tower ground net; d represents the side length of the expanded shared iron tower ground net;
and the third shared iron tower earth screen expansion unit is used for expanding the shared iron tower to initially update the earth screen according to the side length to obtain the expanded shared iron tower earth screen.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a shared iron tower ground net design method and system considering soil resistivity, which comprises the following steps: acquiring the soil resistivity of the area where the shared iron tower is located; determining whether the shared iron tower ground net needs to be connected with an external net or not according to the soil resistivity; when the shared iron tower ground net needs to be connected with an external net, connecting a tower ground net and a communication machine room ground net to obtain an initial updating ground net of the shared iron tower; determining the resistance of the shared iron tower initial updating ground net as a first resistance according to the soil resistivity and the area of the shared iron tower initial updating ground net; and expanding the shared iron tower initial updating earth screen according to the first resistor to obtain the expanded shared iron tower earth screen. According to the invention, different ground net arrangement schemes are set based on the soil resistivity, so that the ground current enters the ground from the side of the tower ground net under the condition of lightning stroke, and the surge interference is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a method for designing a shared iron tower ground grid in embodiment 1 of the present invention;
fig. 2 is a schematic view of a ground grid structure of a shared iron tower in embodiment 1 of the present invention;
fig. 3 is a schematic view of the coaxial terminal connection in embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a shared iron tower ground network design method and system considering soil resistivity, which can determine a ground network arrangement scheme based on the soil resistivity, so that ground current enters the ground from the side of a tower ground network under the condition of lightning stroke, and the surge interference is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
As shown in fig. 1, the embodiment provides a shared iron tower ground grid design method considering soil resistivity, including:
step 101: and acquiring the soil resistivity of the area where the shared iron tower is located.
Step 102: determining whether the shared iron tower ground net needs to be connected with an external net or not according to the soil resistivity; referring to fig. 2, the shared tower grounding network includes a tower grounding network and a communication machine room grounding network.
Step 102 comprises: judging whether the soil resistivity is greater than a soil resistivity threshold value or not to obtain a first judgment result; if the first judgment result is yes, the shared iron tower ground net needs to be connected with an external net; if the first judgment result is negative, the shared iron tower ground net does not need to be connected with an external net.
Step 103: and when the shared iron tower grounding grid needs to be connected with an external network, connecting the tower grounding grid and the communication machine room grounding grid to obtain the initial updating grounding grid of the shared iron tower.
Step 104: and determining the resistance of the shared iron tower initial updating ground net as a first resistance according to the soil resistivity and the area of the shared iron tower initial updating ground net. The first resistance is:
wherein R1 represents a first resistance; ρ represents the soil resistivity; and S1 represents the area of the shared iron tower for initially updating the ground grid.
Step 105: and expanding the shared iron tower initial updating earth screen according to the first resistor to obtain the expanded shared iron tower earth screen.
Step 105 comprises: judging whether the resistance of the initially updated grounding grid of the shared iron tower is smaller than a resistance threshold value to obtainA second judgment result; if the second judgment result is yes, determining the distance between the center of the tower grounding grid and the center of the grounding grid of the communication machine room as a standard distance; judging whether the standard distance is smaller than a distance threshold value or not to obtain a third judgment result; if the third judgment result is yes, determining the shared iron tower initial updating ground net as the expanded shared iron tower ground net; if the third judgment result is negative, the tower grounding network is expanded to the direction opposite to the direction of the communication machine room grounding network by taking the tower grounding network as the center and taking the standard distance as the expansion length to obtain the expanded shared iron tower grounding network; if the second judgment result is negative, then according to the first resistance, using the formula
Calculating the resistance of the expanded shared iron tower grounding grid as a second resistance; r2 represents a second resistance; according to the second resistance and the soil resistivity, using a formula
Determining the area of the expanded shared iron tower ground net; s represents the area of the expanded shared iron tower ground net; according to the area of the expanded shared iron tower ground net, a formula is utilized
Determining the side length of the expanded shared iron tower ground net; d represents the side length of the expanded shared iron tower ground net; and expanding the shared iron tower according to the side length to initially update the earth screen to obtain the expanded shared iron tower earth screen.
Example 2
The embodiment provides a shared iron tower ground net design method considering soil resistivity, which comprises the following steps:
(1) And adding a grounding point. Since the GB50689-2011 'communication bureau (station) lightning protection and grounding engineering design specification' indicates that a feeder line erected on an iron tower and other coaxial cable metal outer protective layers are grounded nearby at an antenna, a position away from the tower and an entrance of a machine room (cabinet) respectively. The radio frequency line using the embodiment to connect the antenna and the communication room uses the cable with double-layer shielding, as shown in fig. 3, the cable adopts the outer shielding layers at the first end and the last end to connect the tower and the ground net of the communication room respectively, the cable is led down from the antenna and then connected with the coaxial terminal at the bottom end of the tower, and the terminal shell is connected with the ground net of the tower. The current flowing through the cable shielding layer can be directly grounded at the tower foot by increasing the grounding point, and the current flowing into the grounding network through the grounding network of the communication machine room is reduced.
(2) And designing an external leading net according to different soil resistivity. This example illustrates the design of a communication counterpoise for soil resistivity below 100 Ω · m and above 100 Ω · m, respectively, according to the grouping in table 1.
(2.1) the resistivity of the soil is lower than 100 omega m, and an external guide net does not need to be designed. The anti-interference requirements can be met by the aid of the connected tower grounding network and the machine room grounding network.
And (2.2) the soil resistivity is higher than 100 omega m, and an external lead net needs to be designed. The design principle is as follows:
(a) The area of the ground net below the communication machine room is increased by 1m compared with the length and width of the enclosing wall of the machine room, the ground net of the communication machine room and the ground net of the tower are connected, the number of the connecting points is not less than two, and the area after connection is S1.
(b) Calculating the grounding resistance R1 (i.e. the first resistance) of the new grounding network composed of the grounding network of the communication machine room and the grounding network of the tower, and if the new grounding network is a rectangular grounding network, the estimation formula can be adopted
The estimation, if any, can be made with reference to the calculation formula given by the existing standard.
(c) If R1 is smaller than 10 omega, and the distance D1 (namely the standard distance) between the center of the grounding network of the communication machine room and the center of the tower is smaller than 3 times of the maximum side length (the side with the maximum length in the rectangle) of the grounding network of the communication machine room, finishing the design; if R1 is smaller than 10 omega, but the distance D1 between the center of the grounding network of the communication machine room and the center of the tower is larger than 3 times of the maximum side length of the grounding network of the communication machine room, the radiation ray with the length of D1 is made in the opposite direction of the communication machine room by taking the grounding network of the tower as the center.
(d) If R1 is greater than 10 Ω, the ground resistance is first estimated to be
The area of the grounding grid required, i.e.
Assuming that the ground screen is approximately square, the side length d is about
The distance between the center of the tower and the center of the communication machine room is equal to that between the center of the tower and the center of the communication machine room, the communication machine room grounding net and the tower grounding net are connected, and the connecting points are not less than two points.
Taking 1000 omega m with the highest soil resistivity as an example, a tower grounding grid is designed according to 20 omega, the grounding grid design refers to GB50169-2016 (Standard for construction and acceptance of grounding devices in Electrical device installation engineering) and uses a radiating grounding electrode with the length of 60m, and a rectangular grounding grid with the center of 15m multiplied by 15m is used as the tower grounding grid. The communication machine room earth screen is 5m multiplied by 5m earth screen. The two geonet centers are separated by 20m, and the two points are connected. According to the embodiment, the soil resistivity is higher than 100 omega m, and an external drainage net needs to be designed. The first resistor R1 is estimated to be 12 omega and is larger than 10 omega, a ground grid needs to be built, and the second resistor R2=60 omega is 8.33m on the side and is 20m away from the center of the tower. In this case, the grounding resistance of the tower grounding grid is small, and considering the worst case, if the grounding resistance is 20 Ω, at this time, the grounding resistance R2=20 Ω of the tower grounding grid needs to be built, the side length is 25m, and the distance is 20m from the center of the tower.
Example 3
The embodiment provides a shared iron tower ground net design system considering soil resistivity, which comprises:
and the soil resistivity acquisition module is used for acquiring the soil resistivity of the area where the shared iron tower is located.
The external network connection determining module is used for determining whether the shared iron tower ground network needs to be connected with an external network according to the soil resistivity; the shared iron tower ground net comprises a tower ground net and a communication machine room ground net.
And the shared iron tower grounding grid updating module is used for connecting the tower grounding grid and the communication machine room grounding grid when the shared iron tower grounding grid needs to be connected with an external grid, so as to obtain the initial updating grounding grid of the shared iron tower.
A first resistance determination module for initially updating the area of the earth mat according to the soil resistivity and the shared iron towerAnd determining the resistance of the shared iron tower for initially updating the earth screen as a first resistance. The first resistance is:
wherein R1 represents a first resistance; ρ represents the soil resistivity; s1 represents the area of the shared iron tower for initially updating the earth screen.
And the shared iron tower earth screen expansion module is used for expanding the shared iron tower according to the first resistance to initially update the earth screen so as to obtain the expanded shared iron tower earth screen.
Wherein, extranet connection confirms the module and includes: the first judgment unit is used for judging whether the soil resistivity is greater than a soil resistivity threshold value or not to obtain a first judgment result; if the first judgment result is yes, calling a first external network judgment unit; if the first judgment result is negative, calling a second external network judgment unit; the first external network judging unit is used for judging that the shared iron tower earth screen needs to be connected with an external network; and the second external network judging unit is used for judging that the shared iron tower earth net does not need to be connected with an external network.
Specifically, sharing iron tower earth mat extension module includes: the second judgment unit is used for judging whether the resistance of the initially updated grounding grid of the shared iron tower is smaller than a resistance threshold value or not to obtain a second judgment result; if the second judgment result is yes, calling a standard distance determination unit; if the second judgment result is negative, calling a second resistance determining unit; the standard distance determining unit is used for determining the distance between the center of the tower grounding grid and the center of the grounding grid of the communication machine room as a standard distance; the third judging unit is used for judging whether the standard distance is smaller than the distance threshold value or not to obtain a third judging result; if the third judgment result is yes, calling a first shared iron tower ground network expansion unit; if the third judgment result is negative, calling a second shared iron tower ground network expansion unit; the first shared iron tower ground net expansion unit is used for determining the initial updated ground net of the shared iron tower as the expanded shared iron tower ground net; the second shared iron tower earth screen expanding unit is used for expanding the tower earth screen to the direction opposite to the direction of the earth screen of the communication machine room by taking the tower earth screen as the center and taking the standard distance as the expanding length to obtain the expanded shared iron tower earth screen; a second resistance determining unit forAccording to the first resistance, using the formula
Calculating the resistance of the expanded shared iron tower grounding grid as a second resistance; r2 represents a second resistance; an area determination unit for using a formula based on the second resistance and the soil resistivity
Determining the area of the expanded shared iron tower ground net; s represents the area of the expanded shared iron tower ground net; a side length determining unit for utilizing a formula according to the area of the expanded shared iron tower ground net
Determining the side length of the expanded shared iron tower ground net; d represents the side length of the expanded shared iron tower ground net; and the third shared iron tower ground net expansion unit is used for expanding the shared iron tower according to the side length to initially update the ground net so as to obtain the expanded shared iron tower ground net.
The embodiments in the present description 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. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (8)
1. A shared iron tower ground net design method considering soil resistivity is characterized by comprising the following steps:
acquiring the soil resistivity of the area where the shared iron tower is located;
determining whether the shared iron tower ground net needs to be connected with an external net or not according to the soil resistivity; the shared iron tower ground net comprises a tower ground net and a communication machine room ground net;
when the shared iron tower earth net needs to be connected with an external net, connecting the tower earth net and the communication machine room earth net to obtain an initial updating earth net of the shared iron tower;
determining the resistance of the shared iron tower initial updating ground net as a first resistance according to the soil resistivity and the area of the shared iron tower initial updating ground net;
and expanding the shared iron tower initial updating earth screen according to the first resistance to obtain the expanded shared iron tower earth screen.
2. The method for designing the shared iron tower grounding network considering the soil resistivity as claimed in claim 1, wherein the determining whether the shared iron tower grounding network needs to be connected with an external network according to the soil resistivity includes:
judging whether the soil resistivity is larger than a soil resistivity threshold value or not to obtain a first judgment result;
if the first judgment result is yes, the shared iron tower earth net needs to be connected with an external net;
and if the first judgment result is negative, the shared iron tower earth net does not need to be connected with an external net.
3. The method for designing the shared iron tower ground net considering the soil resistivity as claimed in claim 1, wherein the first resistance is:
wherein R1 represents a first resistance; ρ represents the soil resistivity; and S1 represents the area of the shared iron tower for initially updating the ground grid.
4. The method for designing the shared iron tower grounding grid considering the soil resistivity as claimed in claim 3, wherein the expanding the shared iron tower initial updating grounding grid according to the first resistance to obtain the expanded shared iron tower grounding grid comprises:
judging whether the resistance of the initially updated grounding grid of the shared iron tower is smaller than a resistance threshold value or not to obtain a second judgment result;
if the second judgment result is yes, determining that the distance between the tower and the ground net center of the communication machine room is a standard distance;
judging whether the standard distance is smaller than a distance threshold value or not to obtain a third judgment result;
if the third judgment result is yes, determining the shared iron tower initial updating ground net as an expanded shared iron tower ground net;
if the third judgment result is negative, the tower and ground net is used as the center, the standard distance is used as the extension length, and the tower and ground net is extended to the opposite direction of the communication machine room and ground net direction, so that the extended shared iron tower and ground net is obtained;
if the second judgment result is negative, a formula is used according to the first resistance
Calculating the resistance of the expanded shared iron tower grounding grid as a second resistance; r2 represents a second resistance;
according to the second resistance and the soil resistivity, using a formula
Determining the area of the expanded shared iron tower ground net; s represents the area of the expanded shared iron tower ground net;
according to the area of the expanded shared iron tower ground net, a formula is utilized
Determining the side length of the expanded shared iron tower ground net; d represents the side length of the expanded shared iron tower ground net;
and expanding the shared iron tower initial updating ground net according to the side length to obtain the expanded shared iron tower ground net.
5. A shared iron tower ground grid design system considering soil resistivity is characterized by comprising:
the soil resistivity acquisition module is used for acquiring the soil resistivity of the area where the shared iron tower is located;
the external network connection determining module is used for determining whether the shared iron tower ground network needs to be connected with an external network according to the soil resistivity; the shared iron tower ground net comprises a tower ground net and a communication machine room ground net;
the shared iron tower ground net updating module is used for connecting the tower ground net and the communication machine room ground net to obtain an initial updated ground net of the shared iron tower when the shared iron tower ground net needs to be connected with an external net;
the first resistance determining module is used for determining the resistance of the shared iron tower initial updating ground grid as a first resistance according to the soil resistivity and the area of the shared iron tower initial updating ground grid;
and the shared iron tower earth screen expansion module is used for expanding the shared iron tower to initially update the earth screen according to the first resistance to obtain the expanded shared iron tower earth screen.
6. The system for designing the shared iron tower ground grid considering the soil resistivity as claimed in claim 5, wherein the external grid connection determining module comprises:
the first judgment unit is used for judging whether the soil resistivity is greater than a soil resistivity threshold value or not to obtain a first judgment result; if the first judgment result is yes, calling a first external network judgment unit; if the first judgment result is negative, calling a second external network judgment unit;
the first external network judging unit is used for judging that the shared iron tower earth net needs to be connected with an external network;
and the second external network judging unit is used for judging that the shared iron tower ground network does not need to be connected with an external network.
7. According to the rightThe system for designing the shared iron tower ground grid considering the soil resistivity as claimed in claim 5, wherein the first resistance is:
wherein R1 represents a first resistance; ρ represents the soil resistivity; and S1 represents the area of the shared iron tower for initially updating the ground grid.
8. The system for designing the shared iron tower ground net considering the soil resistivity as claimed in claim 7, wherein the shared iron tower ground net expansion module comprises:
the second judgment unit is used for judging whether the resistance of the initially updated grounding grid of the shared iron tower is smaller than a resistance threshold value or not to obtain a second judgment result; if the second judgment result is yes, calling a standard distance determining unit; if the second judgment result is negative, calling a second resistance determining unit;
the standard distance determining unit is used for determining that the distance between the center of the tower grounding grid and the center of the grounding grid of the communication machine room is a standard distance;
the third judging unit is used for judging whether the standard distance is smaller than a distance threshold value or not to obtain a third judging result; if the third judgment result is yes, calling a first shared iron tower ground network expansion unit; if the third judgment result is negative, calling a second shared iron tower ground network extension unit;
the first shared iron tower ground net expansion unit is used for determining the shared iron tower initial updating ground net as an expanded shared iron tower ground net;
the second shared iron tower earth screen expanding unit is used for expanding the tower earth screen to the opposite direction of the earth screen of the communication machine room by taking the tower earth screen as the center and the standard distance as the expanding length to obtain the expanded shared iron tower earth screen;
a second resistance determination unit for determining the first resistance according to the formula
Calculating the resistance of the expanded shared iron tower grounding grid as a second resistance; r2 represents a second resistance;
an area determination unit for utilizing a formula based on the second resistance and the soil resistivity
Determining the area of the expanded shared iron tower ground net; s represents the area of the expanded shared iron tower ground net;
a side length determining unit for utilizing a formula according to the area of the expanded shared iron tower ground net
Determining the side length of the expanded shared iron tower ground net; d represents the side length of the expanded shared iron tower ground net;
and the third shared iron tower earth screen expansion unit is used for expanding the shared iron tower to initially update the earth screen according to the side length to obtain the expanded shared iron tower earth screen.
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