CN112230070B - Method and device for determining influence of shared iron tower communication equipment on field intensity of power transmission wire - Google Patents
Method and device for determining influence of shared iron tower communication equipment on field intensity of power transmission wire Download PDFInfo
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Abstract
The invention discloses a method and a device for determining influence of communication equipment arranged on a shared iron tower on field intensity of a power transmission wire. The method comprises the following steps: obtaining a single radio interference value RI generated by a tested transmission conductor 0 The method comprises the steps of carrying out a first treatment on the surface of the Acquiring composite radio interference value RI generated by tested power transmission wire and communication antenna 1 The communication antenna is used for transmitting electromagnetic waves with preset parameters, and the preset parameters are determined according to the type and the working parameters of the communication equipment arranged on the shared iron tower; according to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity of a tested power transmission wire after the shared iron tower is provided with communication equipment; and comparing the surface field intensity of the tested power transmission wire when the communication equipment is not arranged on the shared iron tower with the surface field intensity of the tested power transmission wire after the communication equipment is arranged on the shared iron tower, and determining the field intensity variation quantity of the tested power transmission wire caused by the communication equipment arranged on the shared iron tower. The method is simple and has high accuracy.
Description
Technical Field
The invention belongs to the technical field of electromagnetic compatibility of high-voltage power transmission and transformation engineering, and particularly relates to a method and a device for determining the influence of shared iron tower communication equipment on the field intensity of a power transmission wire.
Background
The sharing of power and communications towers has received a great deal of attention and effort from the power and communications industries as a paradigm of "sharing economies". At present, a few shared towers are tried out, the feasibility of the shared tower technology is verified, but the tried towers and communication equipment are single. With the spread of 5G communication networks, the demand for sharing iron towers is increasing. A tower may have multiple layers of antennas mounted thereon, which would tend to bring the antennas closer to the wires.
The high-intensity electromagnetic field emitted by the communication antenna may influence the surface electric field intensity of the transmission line, so as to deteriorate the electromagnetic environment of the transmission line, even influence the safe operation of the power grid, and the problem of electromagnetic influence of the communication equipment on the transmission line is urgent to be clear, so that measures are taken correspondingly to solve.
Disclosure of Invention
Aiming at the defects of the prior art, the method and the device for determining the influence of the shared iron tower communication equipment on the field intensity of the power transmission wire are provided to solve the problem that the influence of the high-intensity electromagnetic field emitted by the communication antenna on the surface electric field intensity of the power transmission wire is difficult to quantitatively determine at present.
In a first aspect, the present invention provides a method for determining an influence of a communication device arranged on a shared iron tower on a field strength of a transmission line, including the following steps:
1) Obtaining a single radio interference value RI generated by a tested transmission conductor 0 The single radio interference value is measured by using a loop antenna and a radio interference receiver at a detection point in a line corridor of a tested power transmission line; the tested power transmission line is selected according to the type of the power transmission wire in the shared iron tower;
2) Acquiring composite radio interference value RI generated by tested power transmission wire and communication antenna 1 The composite radio interference value RI 1 The method is obtained by measuring detection points in a line corridor of the tested power transmission line by using a loop antenna and a radio interference receiver; the communication antenna is used for transmitting electromagnetic waves with preset parameters, and the preset parameters are determined according to the type and the working parameters of the communication equipment arranged on the shared iron tower;
3) According to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity of a tested power transmission wire after the shared iron tower is provided with communication equipment;
and comparing the surface field intensity of the tested power transmission wire when the communication equipment is not arranged on the shared iron tower with the surface field intensity of the tested power transmission wire after the communication equipment is arranged on the shared iron tower, and determining the field intensity variation quantity of the tested power transmission wire caused by the communication equipment arranged on the shared iron tower.
Further, according to the mirror image method and the Peak formula, the single radio interference value RI generated by the tested transmission conductor 0 Surface field intensity E of tested power transmission wire when communication equipment is not arranged on shared iron tower 0 (n) has the following relationship:
wherein the tested power transmission wire is a split wire, n is the split number of the tested power transmission wire, and a is a constant.
Further, according to the mirror image method and the Peak formula, the composite radio interference value RI generated by the tested transmission conductor and the communication antenna 1 After the communication equipment is arranged with the shared iron tower, the surface field intensity E of the tested transmission wire 1 (n) has the following relationship:
further, according to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity E of a tested power transmission wire after the shared iron tower is provided with communication equipment 1 (n)：
Further, selecting a tested transmission line according to the type of the transmission conductor in the shared iron tower, including:
according to the types and arrangement modes of the power transmission wires erected on the shared iron tower, selecting an actual power transmission line with the same types and arrangement modes of the erected power transmission wires as a tested power transmission line;
and selecting a place which is positioned in the center of the gear and has a flat topography as a test place.
Further, by using the loop antenna and the radio interference receiver, a single radio interference value RI generated by the tested transmission line is measured at a detection point in a line corridor of the tested transmission line 0 Comprising:
in a test site, taking the position 20m outside the ground projection of the side wire of the power transmission line as a detection point;
erecting a loop antenna at the detection point, and ensuring that the ground clearance of the loop antenna is a preset value;
measuring a radio interference value received by the loop antenna at a checkpoint with a radio interference receiver, the radio interference value being a single radio interference value RI generated by the tested transmission conductor 0 。
Further, in the step of acquiring the composite radio interference value RI generated by the tested power transmission wire and the communication antenna 1 Before, still include:
according to parameters of communication equipment arranged on a shared iron tower, including a directional diagram, a gain, a beam width, a downward inclination angle, a transmitting power and the like, selecting a communication antenna, a vector signal source and a power amplifier which can cover the parameters;
in the test field, the communication antenna is erected on one side opposite to the annular antenna, and the horizontal direction and the downward inclination angle of the communication antenna are adjusted according to the erection mode of the antenna of the communication equipment arranged on the shared iron tower, so that the main lobe of electromagnetic waves emitted by the communication antenna is aligned with a transmission wire;
the vector signal source generates a source signal according to the modulation mode of the communication antenna and sends the source signal to the power amplifier;
the power amplifier is set as the transmitting power of the communication antenna, amplifies the source signal generated by the vector signal source, inputs the source signal to the communication antenna, and transmits electromagnetic waves by the communication antenna to simulate the scene of the communication equipment transmitting the electromagnetic waves.
Further, the frequency range of the annular antenna is 150kHz-30MHz;
the radio interference receiver has a linear frequency in the range of 150kHz-30MHz.
Further, the transmitting power range of the communication antenna is 0-200W;
the modulation mode of the vector signal source is QAM64;
the connection cable and the connector of the power amplifier and the communication antenna are not more than 1dB in insertion loss.
Further, the tested power transmission line comprises a plurality of tested power transmission wires, and the tested power transmission wires are one phase of three-phase alternating current of a single-circuit line, or one phase of three-phase alternating current of any circuit of a double-circuit line, or one phase of three-phase alternating current of any circuit of a multi-circuit line.
In a second aspect, the present invention provides a device for determining the effect of a communication device arranged on a shared iron tower on the field strength of a transmission line, including:
a single radio interference value acquisition unit for acquiring a single radio interference value RI generated by a power transmission line under test 0 The single radio interference value is measured by using a loop antenna and a radio interference receiver at a detection point in a line corridor of a tested power transmission line; the tested power transmission line is selected according to the type of a power transmission wire in the shared iron tower and the type of communication equipment;
a composite radio interference value acquisition unit for acquiring a composite radio interference value RI generated by a tested power transmission line and a communication antenna 1 The composite radio interference value RI 1 The method is obtained by measuring detection points in a line corridor of the tested power transmission line by using a loop antenna and a radio interference receiver; the communication antenna is used for transmitting electromagnetic waves with preset parameters, and the preset parameters are determined according to the type and the working parameters of the communication equipment arranged on the shared iron tower;
a field intensity variation determining unit for determining a single radio interference value RI based on the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity of a tested power transmission wire after the shared iron tower is provided with communication equipment;
and comparing the surface field intensity of the tested power transmission wire when the communication equipment is not arranged on the shared iron tower with the surface field intensity of the tested power transmission wire after the communication equipment is arranged on the shared iron tower, and determining the field intensity variation quantity of the tested power transmission wire caused by the communication equipment arranged on the shared iron tower.
The invention provides a method and a device for determining the influence of communication equipment arranged on a shared iron tower on the field intensity of a transmission wire, wherein a tested transmission wire is selected; testing radio interference value RI of tested power transmission line 0 The method comprises the steps of carrying out a first treatment on the surface of the Transmitting electromagnetic waves close to communication antennas and testing applied electromagnetic wavesRadio interference value RI of a post-wave power transmission line 1 The method comprises the steps of carrying out a first treatment on the surface of the By data processing and based on the surface field strength E before accounting for the electromagnetic field emitted by the communication antenna 0 Determining the surface field strength E of a power transmission line after accounting for the electromagnetic field emitted by a communication antenna 1 And finally, the field intensity variation of the power transmission wires caused by the communication equipment arranged on the shared iron tower is determined.
Compared with the prior art, the method and the device for determining the influence of the communication equipment arranged on the shared iron tower on the field intensity of the power transmission wire indirectly obtain the variation of the field intensity of the surface of the power transmission wire caused by the communication equipment by adopting the method for testing the radio interference of the power transmission line. The method is easy to implement, and the influence degree of the electromagnetic field emitted by the communication equipment arranged on the shared iron tower on the field intensity of the transmission wire can be quantitatively determined. The method is simple and high in accuracy, and the determined variation of the surface field intensity of the power transmission wire can be further used for determining the optimal protection distance between the communication equipment arranged on the shared iron tower and the power transmission wire.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
fig. 1 is a flow chart of a method for determining an effect of a communication device arranged on a shared iron tower on field strength of a transmission line according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of the arrangement of the communication device of the preferred embodiment of the present invention for determining the effect of the communication device on the field strength of the transmission line;
fig. 3 is a schematic diagram of a measurement arrangement of a method for determining the effect of a communication device arranged in a shared pylon on the field strength of a transmission line according to a preferred embodiment of the present invention;
fig. 4 is a schematic view of a split conductor in a preferred embodiment of the present invention;
fig. 5 is a schematic diagram of the mirror image method for calculating the surface field intensity of the wire in the preferred embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The overhead transmission line consists of a line tower (also called a transmission tower or a transmission iron tower), a wire, an insulator, a line fitting, a stay wire, a tower foundation, a grounding device and the like, and is erected on the ground.
Span: the horizontal distance between two suspension points of the overhead transmission line in a plane parallel to the specific load born by the wires between two adjacent towers is the span of the two towers.
Line corridor: the land area and the space area occupied by the paths of the overhead transmission lines. In order to ensure the insulation strength of the line and to avoid the risk of electric shock to the person and ground building and other objects, and to prevent the electrostatic field from physiologically and ecologically damaging the wires and nearby people, a necessary clear space region is maintained around the wires at high voltage. As the voltage class of the transmission line increases, the range of the line corridor is significantly enlarged. For example, for a single-circuit 500kv uhv transmission line, the tower height is typically up to 30 meters, and the line corridor width is about 45 meters.
The split conductor refers to a conductor erection mode adopted by the ultra-high voltage transmission line for inhibiting corona discharge and reducing line reactance, each phase of conductor consists of a plurality of sub-conductors with smaller diameters, and the sub-conductors are arranged at intervals and in a symmetrical polygon shape and are arranged on the top of the regular polygon. Compared with a large wire with the same total section, the split wire is not easy to generate corona and has higher power transmission capability. Split conductors are mainly used in lines with voltages of 220kv and above. Typically 220kV is 2 split, 500kV is 4 split, 750kV of northwest power grid is 6 split, and 1000kV is 8 split.
When the transmission line is in live operation, a corona discharge phenomenon exists on the surface of a transmission wire. At this time, a large amount of charged particles generated by corona discharge are accumulated around the power transmission wire. In the case of a shared pylon provided with communication equipment, the transmission conductors are in turn exposed to electromagnetic waves emitted by the communication antennas. Since electromagnetic waves have a wave grain bishape, the communication electromagnetic field interacts with charged particles near the power transmission wire, thereby changing the surface electric field strength of the power transmission wire. After the electric field intensity on the surface of the lead exceeds a certain range, the electromagnetic environment of the power transmission line is deteriorated, and when the electric field intensity is severe, air gap breakdown can occur, so that the safe operation of a power grid is affected.
At present, the surface electric field strength of a power transmission wire cannot be directly measured, so that the influence of a communication electromagnetic field on the surface electric field strength of the wire cannot be determined, and a communication antenna is usually required to be kept at a long distance from the power transmission wire so as to ensure safe operation of a power grid.
Aiming at the problem that the method for determining the influence of the lack of a communication electromagnetic field on the electric field intensity of the surface of the conductor is combined with the physical effect of the electric field intensity of the surface of the conductor, the difficulty that the electric field intensity of the surface of the current conductor cannot be tested and the method for determining the influence of the communication equipment arranged on the shared iron tower on the electric field intensity of the conductor is overcome.
As shown in fig. 1, a method for determining an influence of a communication device provided by a shared iron tower on a field strength of a power transmission line according to an embodiment of the present invention includes:
step S100: obtaining a single radio interference value RI generated by a tested transmission conductor 0 The single radio interference value is measured by using a loop antenna and a radio interference receiver at a detection point in a line corridor of a tested power transmission line; the tested power transmission line is selected according to the type of a power transmission wire in the shared iron tower and the type of communication equipment;
step S200: obtaining the tested transmission conductorComposite radio interference value RI generated by wire and communication antenna 1 The composite radio interference value RI 1 The method is obtained by measuring detection points in a line corridor of the tested power transmission line by using a loop antenna and a radio interference receiver; the communication antenna is used for transmitting electromagnetic waves with preset parameters, and the preset parameters are determined according to the type and the working parameters of the communication equipment arranged on the shared iron tower;
step S300: according to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity of a tested power transmission wire after the shared iron tower is provided with communication equipment;
and comparing the surface field intensity of the tested power transmission wire when the communication equipment is not arranged on the shared iron tower with the surface field intensity of the tested power transmission wire after the communication equipment is arranged on the shared iron tower, and determining the field intensity variation quantity of the tested power transmission wire caused by the communication equipment arranged on the shared iron tower.
Specifically, according to the mirror image method and the Peak formula, a single radio interference value RI generated by a tested power transmission wire 0 Surface field intensity E of tested power transmission wire when communication equipment is not arranged on shared iron tower 0 (n) has the following relationship:
wherein the tested power transmission wire is a split wire, n is the split number of the tested power transmission wire, and a is a constant.
Specifically, according to the mirror image method and the Peak formula, the composite radio interference value RI generated by the tested transmission conductor and the communication antenna 1 After the communication equipment is arranged with the shared iron tower, the surface field intensity E of the tested transmission wire 1 (n) has the following relationship:
in particular, according to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity E of a tested power transmission wire after the shared iron tower is provided with communication equipment 1 (n)：
Specifically, according to the type of the transmission wire in the shared iron tower, selecting a tested transmission line comprises:
according to the types and arrangement modes of the power transmission wires erected on the shared iron tower, selecting an actual power transmission line with the same types and arrangement modes of the erected power transmission wires as a tested power transmission line;
and selecting a place which is positioned in the center of the gear and has a flat topography as a test place.
Specifically, a loop antenna and a radio interference receiver are utilized to measure a single radio interference value RI generated by a tested power transmission line at a detection point in a line corridor of the tested power transmission line 0 Comprising:
in a test site, taking the position 20m outside the ground projection of the side wire of the power transmission line as a detection point;
erecting a loop antenna at the detection point, and ensuring that the ground clearance of the loop antenna is a preset value;
measuring a radio interference value received by the loop antenna at a checkpoint with a radio interference receiver, the radio interference value being a single radio interference value RI generated by the tested transmission conductor 0 。
Specifically, the composite radio interference value RI generated by the tested power transmission wire and the communication antenna is obtained 1 Before, still include:
according to parameters of communication equipment arranged on a shared iron tower, including a directional diagram, a gain, a beam width, a downward inclination angle, a transmitting power and the like, selecting a communication antenna, a vector signal source and a power amplifier which can cover the parameters;
in the test field, the communication antenna is erected on one side opposite to the annular antenna, and the horizontal direction and the downward inclination angle of the communication antenna are adjusted according to the erection mode of the antenna of the communication equipment arranged on the shared iron tower, so that the main lobe of electromagnetic waves emitted by the communication antenna is aligned with a transmission wire;
the vector signal source generates a source signal according to the modulation mode of the communication antenna and sends the source signal to the power amplifier;
the power amplifier is set as the transmitting power of the communication antenna, amplifies the source signal generated by the vector signal source, inputs the source signal to the communication antenna, and transmits electromagnetic waves by the communication antenna to simulate the scene of the communication equipment transmitting the electromagnetic waves.
Specifically, the frequency range of the annular antenna is 150kHz-30MHz;
the radio interference receiver has a linear frequency in the range of 150kHz-30MHz.
Specifically, the transmitting power range of the communication antenna is 0-200W;
the modulation mode of the vector signal source is QAM64;
the connection cable and the connector of the power amplifier and the communication antenna are not more than 1dB in insertion loss.
Specifically, the tested power transmission line comprises a plurality of tested power transmission wires, and the tested power transmission wires are one phase of three-phase alternating current of a single-circuit line, or one phase of three-phase alternating current of any circuit of a double-circuit line, or one phase of three-phase alternating current of any circuit of a multi-circuit line.
As shown in fig. 2, a device for determining an influence of a communication device provided by a shared iron tower on a field strength of a transmission line according to an embodiment of the present invention includes:
a single radio interference value acquisition unit 10 for acquiring a single radio interference value RI generated by a power transmission line under test 0 The single radio interference value is measured by using a loop antenna and a radio interference receiver at a detection point in a line corridor of a tested power transmission line; the tested power transmission line is selected according to the type of a power transmission wire in the shared iron tower and the type of communication equipment;
a composite radio interference value acquisition unit 20 for acquiring the transmission power conducted by the subjectComposite radio interference value RI generated by wire and communication antenna 1 The composite radio interference value RI 1 The method is obtained by measuring detection points in a line corridor of the tested power transmission line by using a loop antenna and a radio interference receiver; the communication antenna is used for transmitting electromagnetic waves with preset parameters, and the preset parameters are determined according to the type and the working parameters of the communication equipment arranged on the shared iron tower;
a field strength variation determining unit 30 for determining a field strength variation according to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity of a tested power transmission wire after the shared iron tower is provided with communication equipment;
and comparing the surface field intensity of the tested power transmission wire when the communication equipment is not arranged on the shared iron tower with the surface field intensity of the tested power transmission wire after the communication equipment is arranged on the shared iron tower, and determining the field intensity variation quantity of the tested power transmission wire caused by the communication equipment arranged on the shared iron tower.
The device for determining the influence of the communication equipment arranged on the shared iron tower on the field intensity of the power transmission wire is a device corresponding to the method, has the same technical conception, technical scheme and technical effect as the method, and is not repeated here.
The method for determining the influence of the shared iron tower communication equipment on the field intensity of the power transmission wire comprises the following steps:
1) Selecting a tested object and a test site
As shown in fig. 3, according to the types and arrangement modes of the power transmission wires erected on the shared iron tower, the power transmission line 2 on the actual power transmission line 1 with the same types and arrangement modes of the power transmission wires is selected as a tested object, and a place which is positioned in the center of the span and has a flat topography between two adjacent towers is selected as a test place.
2) Testing single radio interference value RI generated by tested power transmission line at detection point 0
As shown in fig. 3, a 20m position outside the projection of the transmission line roadside conductor ground is used as a detection point in the test site. A loop antenna 6 is installed at the detection point and the radio interference value at the detection point received by the loop antenna is measured by a radio interference receiver 7.
3) Setting communication antenna to emit electromagnetic wave
According to the parameters of the communication antennas erected on the shared iron tower, including the directional diagram, the gain, the beam width, the downward inclination angle, the transmitting power and the like, the communication antennas with the parameters close to each other are selected to simulate the transmitting electromagnetic waves.
And adjusting the horizontal direction and the downward inclination angle of the communication antenna according to the erection mode of the communication antenna on the shared iron tower, so that the main lobe of electromagnetic waves emitted by the communication antenna is aligned to the transmission wire.
As shown in fig. 3, when transmitting electromagnetic waves, the vector signal source 5 sets the same modulation scheme according to the modulation scheme of the communication antenna 3, and the generated source signal is sent to the power amplifier 4; the power of the power amplifier is set as the transmitting power of the communication antenna, and the power amplifier amplifies the source signal generated by the vector signal source and inputs the source signal to the communication antenna.
4) Testing the received composite radio interference RI at the detection point 1
As shown in fig. 3, the radio interference receiver 7 is used to measure the radio interference value RI at the check point received by the loop antenna 6 1 . Radio interference value RI 1 Comprising two sources of interference: radio interference generated by the tested power transmission wire and radio interference emitted by the communication antenna.
5) Test data processing to determine the variation of the surface field intensity of the wire
For a transmission line whose number of splits and arrangement form have been determined, its radio interference has the following relation with the surface field strength:
wherein E is 0 Can be obtained by Pi Kegong formula; or adopting a finite element algorithm to obtain; the method comprises the steps of carrying out a first treatment on the surface of the n is the split number of the transmission wires.
After electromagnetic waves emitted by the communication antenna are counted, radio interference received by the power transmission wire is as follows:
by combining the formulas (1) and (2), the surface field intensity E of the transmission wire after accounting the electromagnetic field emitted by the communication antenna can be obtained 1 。
As shown in FIG. 5, the surface field intensity E of the tested transmission line is calculated according to the mirror image method and the Peak formula 0 (n) comprising:
wherein P= [ P ] ij ]；
Wherein, delta' ij Is the distance between the conductor j and the ground mirror image of the conductor j;
Δ ij is the distance between wires i and j;
wherein h is the height of the wire to the ground;
C＝P -1 ；C＝[c ij ]；
Q＝CU，
wherein U is the phase voltage of a single-phase wire of the power transmission line, for example, the phase voltage U of a 500kV line is 289kV;
Q＝[q i ]；
wherein r is eq Is equivalent radius, m;
r is the radius of the split conductor and m;
r is the radius of the branch wire, cm;
ε 0 is the dielectric constant in vacuum.
Specifically, the frequency range of the loop antenna is 150kHz-30MHz, and the erection height of the loop antenna is 2m. The linear frequency range of the radio interference receiver is 150kHz-30MHz, which accords with the requirements of CISPR on radio interference measuring equipment.
Specifically, the main beam central line of the communication antenna is aligned with the transmission wire, and the transmission power of the communication antenna is adjustable from 0W to 200W. The frequency of the electromagnetic wave transmitted by the communication antenna is the frequency of the signal transmitted by the communication device to be installed. The power and frequency of the power amplifier covers the power and frequency of the communication antenna. The connection cable and the connector of the power amplifier and the communication antenna are not more than 1dB in insertion loss.
Compared with the prior art, the method of the embodiment of the invention indirectly obtains the variation of the surface field intensity of the power transmission wire caused by the communication equipment by adopting the method for testing the radio interference of the power transmission line. The method is easy to implement, and the influence degree of the electromagnetic field emitted by the communication equipment arranged on the shared iron tower on the field intensity of the transmission wire can be quantitatively determined. The method is simple and high in accuracy, and the determined variation of the surface field intensity of the power transmission wire can be further used for determining the optimal protection distance between the communication equipment arranged on the shared iron tower and the power transmission wire.
By using the method for determining the influence of the shared iron tower communication equipment on the field intensity of the transmission line, which is disclosed by the embodiment of the invention, the field intensity variation of the transmission line caused by the communication equipment is determined for a certain shared iron tower with the transmission line model of 4 xLGJ-400 and 500kV single-loop horizontal arrangement, and the method comprises the following steps:
when the field intensity variation of the power transmission wires caused by the communication equipment arranged on the shared iron tower is determined, the actual power transmission line with the parameters is selected as a tested object, and a place with a flat profile from the center is selected as a test place.
Selecting 20m outside the projection of the ground of the side wire on either side of the transmission line as a detection point in a test site, erecting a loop antenna, and measuring the radio interference value at the measurement point by using a radio interference receiver, specifically RI 0 =42 (in dB (μv/m)).
The beam width of the communication antenna erected on the shared iron tower is 60 degrees, the gain is 15dBi, the downward inclination angle is-15 degrees, and the transmitting power is 20W. The communication antenna capable of covering the above parameters is selected to emit electromagnetic waves.
When transmitting electromagnetic waves, the vector signal source sets the same modulation scheme, namely QAM64, according to the communication modulation scheme, and generates a source signal to be sent to the power amplifier. The power of the power amplifier is set to 20W, which is the transmission power of the communication antenna. The power amplifier amplifies the source signal and inputs the amplified source signal to the communication antenna. According to the mode of erecting the antenna on the shared iron tower, the horizontal direction (namely the included angle between the communication antenna and the wire in the horizontal plane) and the downward inclination angle of the communication antenna are adjusted, so that the main lobe of electromagnetic waves emitted by the communication antenna is aligned with the transmission wire.
At this time, in the electromagnetic wave environment generated by the communication antenna, the radio interference at the detection point is measured as RI 1 ＝42。
When the type of the power transmission wire is 4 xLGJ-400, the splitting number and the radius are known (as shown in fig. 4), and the radio interference and the surface field intensity are determined to have the following relation: RI (RI) 0 ＝a+3.5E 0 。
Calculating the surface field intensity of the transmission conductor by adopting a mirror image method, and obtaining E by a Peak formula 0 ＝16.20kV/cm。
After electromagnetic waves from the communication device are applied, radio interference of the transmission wire is as follows:
RI 1 ＝a+3.5E 1 (n)。
the field intensity E of the transmission surface of the conductor after the electromagnetic field is applied can be obtained by the steps (1) and (2) 1 ：
E 1 ＝(RI 1 -RI 0 )/3.5+E 0 。
Aiming at the transmission towers with the transmission wire types of 4 XLGJ-400 and 500kV single-loop horizontal arrangement, the received radio interference is not changed at the detection point, and the surface field intensity of the transmission wire is not changed before and after the communication antenna is added. This is because the electromagnetic wave power emitted by the communication device is small and the distance from the transmission line is far enough to change the line surface field strength.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The invention has been described above with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a// the [ means, component, etc ]" are to be interpreted openly as referring to at least one instance of means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (7)
1. A method for determining the influence of communication equipment arranged on a shared iron tower on the field intensity of a power transmission wire is characterized by comprising the following steps:
1) Obtaining a single radio interference value RI generated by a tested transmission conductor 0 The single radio interference value is measured by using a loop antenna and a radio interference receiver at a detection point in a line corridor of a tested power transmission line; the tested power transmission line is selected according to the type of the power transmission wire in the shared iron tower;
2) Acquiring composite radio interference value RI generated by tested power transmission wire and communication antenna 1 The composite radio interference value RI 1 The method is obtained by measuring detection points in a line corridor of the tested power transmission line by using a loop antenna and a radio interference receiver; the communication antenna is used for transmitting electromagnetic waves with preset parameters, and the preset parameters are communication equipment set according to the shared iron towerIs determined by the type and the working parameters of the device;
3) According to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity of a tested power transmission wire after the shared iron tower is provided with communication equipment;
comparing the surface field intensity of the tested power transmission wire when the communication equipment is not arranged on the shared iron tower with the surface field intensity of the tested power transmission wire after the communication equipment is arranged on the shared iron tower, and determining the field intensity variation of the tested power transmission wire caused by the communication equipment arranged on the shared iron tower;
single radio interference value RI generated by tested transmission line according to mirror image method and pick formula 0 Surface field intensity E of tested power transmission wire when communication equipment is not arranged on shared iron tower 0 (n) has the following relationship:
wherein the tested power transmission wire is a split wire, n is the split number of the tested power transmission wire, and a is a constant;
according to mirror image method and Peak formula, the tested transmission line and communication antenna generate composite radio interference value RI 1 After the communication equipment is arranged with the shared iron tower, the surface field intensity E of the tested transmission wire 1 (n) has the following relationship:
according to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity E of a tested power transmission wire after the shared iron tower is provided with communication equipment 1 (n)：
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
selecting a tested power transmission line according to the type of a power transmission wire in the shared iron tower, wherein the method comprises the following steps:
according to the types and arrangement modes of the power transmission wires erected on the shared iron tower, selecting an actual power transmission line with the same types and arrangement modes of the erected power transmission wires as a tested power transmission line;
and selecting a place which is positioned in the center of the gear and has a flat topography as a test place.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
measuring a single radio interference value RI generated by a tested transmission line at a detection point in a line corridor of the tested transmission line by using a loop antenna and a radio interference receiver 0 Comprising:
in a test site, taking the position 20m outside the ground projection of the side wire of the power transmission line as a detection point;
erecting a loop antenna at the detection point, and ensuring that the ground clearance of the loop antenna is a preset value;
measuring a radio interference value received by the loop antenna at a checkpoint with a radio interference receiver, the radio interference value being a single radio interference value RI generated by the tested transmission conductor 0 。
4. The method of claim 3, wherein the step of,
in the process of obtaining the composite radio interference value RI generated by the tested power transmission wire and the communication antenna 1 Before, still include:
according to parameters of communication equipment arranged on a shared iron tower, including a directional diagram, a gain, a beam width, a downward inclination angle, a transmitting power and the like, selecting a communication antenna, a vector signal source and a power amplifier which can cover the parameters;
in the test field, the communication antenna is erected on one side opposite to the annular antenna, and the horizontal direction and the downward inclination angle of the communication antenna are adjusted according to the erection mode of the antenna of the communication equipment arranged on the shared iron tower, so that the main lobe of electromagnetic waves emitted by the communication antenna is aligned with a transmission wire;
the vector signal source generates a source signal according to the modulation mode of the communication antenna and sends the source signal to the power amplifier;
the power amplifier is set as the transmitting power of the communication antenna, amplifies the source signal generated by the vector signal source, inputs the source signal to the communication antenna, and transmits electromagnetic waves by the communication antenna to simulate the scene of the communication equipment transmitting the electromagnetic waves.
5. The method of claim 4, wherein the step of determining the position of the first electrode is performed,
the frequency range of the annular antenna is 150kHz-30MHz;
the linear frequency range of the radio interference receiver is 150kHz-30MHz;
the transmitting power range of the communication antenna is 0-200W;
the modulation mode of the vector signal source is QAM64;
the connection cable and the connector of the power amplifier and the communication antenna are not more than 1dB in insertion loss.
6. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the tested power transmission line comprises a plurality of tested power transmission wires, wherein the tested power transmission wires are one phase of three-phase alternating current of a single-circuit line, or one phase of three-phase alternating current of any circuit of a double-circuit line, or one phase of three-phase alternating current of any circuit of a multi-circuit line.
7. A device for determining the effect of a communication device sharing an iron tower setting on the field strength of a transmission conductor, comprising:
a single radio interference value acquisition unit for acquiring a single radio interference value RI generated by a power transmission line under test 0 The single radio interference value is obtained by using a loop antenna and a radio interference receiver on a power line to be testedMeasuring detection points in a line corridor of a road; the tested power transmission line is selected according to the type of a power transmission wire in the shared iron tower and the type of communication equipment;
a composite radio interference value acquisition unit for acquiring a composite radio interference value RI generated by a tested power transmission line and a communication antenna 1 The composite radio interference value RI 1 The method is obtained by measuring detection points in a line corridor of the tested power transmission line by using a loop antenna and a radio interference receiver; the communication antenna is used for transmitting electromagnetic waves with preset parameters, and the preset parameters are determined according to the type and the working parameters of the communication equipment arranged on the shared iron tower;
a field intensity variation determining unit for determining a single radio interference value RI based on the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity of a tested power transmission wire after the shared iron tower is provided with communication equipment;
comparing the surface field intensity of the tested power transmission wire when the communication equipment is not arranged on the shared iron tower with the surface field intensity of the tested power transmission wire after the communication equipment is arranged on the shared iron tower, and determining the field intensity variation of the tested power transmission wire caused by the communication equipment arranged on the shared iron tower;
single radio interference value RI generated by tested transmission line according to mirror image method and pick formula 0 Surface field intensity E of tested power transmission wire when communication equipment is not arranged on shared iron tower 0 (n) has the following relationship:
wherein the tested power transmission wire is a split wire, n is the split number of the tested power transmission wire, and a is a constant;
according to mirror image method and Peak formula, the tested transmission line and communication antenna generate composite radio interference value RI 1 After the communication equipment is arranged with the shared iron tower, the surface field intensity E of the tested transmission wire 1 (n) has the following relationship:
according to the single radio interference value RI 0 The composite radio interference value RI 1 Determining the surface field intensity E of a tested power transmission wire after the shared iron tower is provided with communication equipment 1 (n)：
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