CN114396859B - Overhead line windage yaw monitoring method and device based on ground wire electromagnetic signals - Google Patents
Overhead line windage yaw monitoring method and device based on ground wire electromagnetic signals Download PDFInfo
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Abstract
The invention provides an overhead line windage yaw monitoring method and device based on a ground wire electromagnetic signal, wherein the method comprises the following steps: installing a voltage monitoring device or a current monitoring device on an overhead line ground wire, and combining with a matched data processing and communication module, monitoring the induced voltage or the induced current on the ground wire in real time; when the induced voltage or the induced current changes, the ground wire induced voltage or the induced current value before and after the change is judged by the related module and then sent to the data processing end; reversely deducing the mutual inductance change condition between the ground wires by combining the running current of the circuit and the collected change condition of the ground wire electromagnetic signals, and reversely pushing the space position change condition of the wire based on the mutual inductance change condition between the wire and the ground wires; and reversely pushing the wind deflection condition of the line according to the change condition of the space position of the wire, and sending out an alarm when the wind deflection condition exceeds a threshold value. The self-powered circuit sag state monitoring device can monitor the circuit sag state on line in a self-powered manner without additional power supply, and normal operation of the circuit is not affected when the monitoring device breaks down.
Description
Technical Field
The invention belongs to the technical field of high voltage, and particularly relates to an overhead line windage yaw monitoring method and device based on a ground wire electromagnetic signal.
Background
Wind deflection refers to the phenomenon that a transmission line conductor deviates from the vertical position under the action of wind, and mainly comprises jumper wind deflection, interphase wind deflection and insulator wind deflection. The windage and galloping of the wire are different. In case of too high or too low wind speed, the wire generally does not wave; for windage yaw, the greater the wind speed, the more severe the windage yaw phenomenon.
Windage can cause too small a distance between wires or towers, which can lead to flashover or trip failures. Due to the continuity of wind, wind deflection flashover tripping generally cannot be successfully reclosed, thereby resulting in shutdown of the line. In 2005 to 2011, over 750 times of windage tripping occurs on 110kV and above transmission lines in China, and only over 20 times of windage tripping occurs on 500kV lines in Henan province in nearly 10 years, so that huge harm is brought to the safe operation of a power system.
The existing on-line monitoring method for the windage yaw of the overhead transmission line mainly comprises the steps of installing motion sensors on a wire, and the method has the problems of high sensor quantity, power failure operation for installation and maintenance, difficult power supply of a monitoring device and the like.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the first object of the present invention is to provide an overhead line windage yaw monitoring method based on a ground wire electromagnetic signal, which solves the problems of more sensors, high cost and difficult installation related to the existing method, and solves the technical problems of complex calculation principle and influence on normal operation of the line when the sensor fails, and can judge the spatial position of the line through the information of the ground wire electromagnetic signal and the wire current, meanwhile, no additional power supply is needed, the online monitoring of the spatial position of the line can be realized with self power supply, and the installed device has small volume and low failure cost, and does not influence the normal operation of the line when the failure occurs. The wind deflection condition monitoring method for judging the power transmission wire based on the induced voltage on the segmented insulating ground wire or the induced current change condition on the OPGW is simple in principle, low in cost, simple and convenient to install and maintain and high in feasibility.
A second object of the present invention is to provide an overhead line windage monitoring device based on a ground electromagnetic signal.
A third object of the present application is to propose a non-transitory computer readable storage medium.
To achieve the above objective, an embodiment of a first aspect of the present invention provides an overhead line wind deflection monitoring method based on a ground wire electromagnetic signal, including: installing a voltage monitoring device or a current monitoring device on an overhead line ground wire, and combining with a matched data processing and communication module, monitoring the induced voltage or the induced current on the ground wire in real time; based on the induced voltage or the induced current value, the ground wire induced voltage or the induced current value before and after the change is sent to a data processing end; the method comprises the steps of reversely pushing the mutual inductance change condition between a wire and a ground wire according to the running current of the wire and the collected change condition of an electromagnetic signal of the ground wire, and reversely pushing the change condition of the space position of the wire based on the mutual inductance change condition between the wire and the ground wire; and reversely pushing the wind deflection condition of the line according to the change condition of the space position of the wire, and sending out an alarm when the wind deflection condition exceeds a threshold value.
The overhead line windage yaw monitoring method based on the ground wire electromagnetic signals provided by the embodiment of the invention not only can monitor the line by utilizing the voltage or current signals on the ground wire, but also can be used for supplying power to the monitoring device, thereby realizing the aim of self-power supply and even supplying power to other devices.
In addition, the overhead line windage monitoring method based on the ground wire electromagnetic signal according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, in combination with the change of the line running current and the collected change of the ground electromagnetic signal, the mutual inductance change between the ground lines is reversely deduced, and based on this, the method further reversely pushes the change of the space position of the wire, which includes:
analyzing and judging the mutual inductance change condition between the conductors and the ground wires based on the monitored ground wire voltage or current change condition;
reversely deducing the change condition of the distance between the ground wires according to the change condition of the mutual inductance between the ground wires;
and further refining according to the change condition of the distance between the lead and the ground wire to obtain the change condition of the space position of the lead.
Further, in an embodiment of the present invention, the judgment is performed according to the windage condition of the wire, and an alarm is sent when the maximum deviation amount of the wire exceeds a preset threshold value.
To achieve the above object, a second aspect of the present invention provides an overhead line wind deflection monitoring device based on a ground electromagnetic signal, which is characterized by comprising: the monitoring module is used for installing a voltage monitoring device or a current monitoring device on the ground line of the overhead line, and combining with the matched data processing and communication module, the induced voltage or the induced current on the ground line is monitored in real time; the acquisition module is used for transmitting the ground wire induced voltage or the induced current value before and after the change to the data processing end based on the induced voltage or the induced current value; the analysis module is used for reversely pushing the mutual inductance change condition between the lead and the ground wire according to the line running current and the collected ground wire electromagnetic signal change condition and reversely pushing the space position change condition of the lead based on the mutual inductance change condition between the lead and the ground wire; and the warning module is used for reversely pushing the wind deflection condition of the line according to the change condition of the space position of the wire and sending out an alarm when the wind deflection condition exceeds a threshold value.
Optionally, in an embodiment of the present application, the monitoring device further includes a power supply module, configured to power the monitoring device by using an induced voltage or an induced current on a ground line, so as to achieve self-power.
To achieve the above object, an embodiment of a third aspect of the present application proposes a non-transitory computer-readable storage medium, capable of executing an overhead line wind bias monitoring method based on a ground wire electromagnetic signal when instructions in the storage medium are executed by a processor.
The overhead line windage yaw monitoring method based on the ground wire electromagnetic signals, the overhead line windage yaw monitoring device based on the ground wire electromagnetic signals and the non-transitory computer readable storage medium solve the problems of more sensors, high cost and difficult installation related to the existing method, solve the technical problems that the existing method is complex in calculation principle and can influence normal operation of a line when the sensors are in failure, judge the spatial position of the line through the information of the ground wire electromagnetic signals and the wire currents, meanwhile, do not need an additional power supply, can realize on-line monitoring of the spatial position of the line in a self-powered mode, and the installed device is small in size and low in failure cost and does not influence the normal operation of the line when the failure occurs. The wind deflection condition monitoring method for judging the power transmission wire based on the induced voltage on the segmented insulating ground wire or the induced current change condition on the OPGW is simple in principle, low in cost, simple and convenient to install and maintain and high in feasibility.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic flow chart of an overhead line windage monitoring method based on a ground wire electromagnetic signal according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of an overhead line wind deflection monitoring device based on a ground wire electromagnetic signal according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of ground sensing according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of calculating a spatial position of a wire according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a monitoring scheme according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a change of ground induced current according to a windage according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The method and the device for monitoring the wind deflection of the overhead line based on the ground wire electromagnetic signal are described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of an overhead line windage monitoring method based on a ground wire electromagnetic signal according to an embodiment of the present invention.
As shown in fig. 1, the overhead line windage monitoring method based on the ground wire electromagnetic signal comprises the following steps:
s101: installing a voltage monitoring device or a current monitoring device on an overhead line ground wire, and combining with a matched data processing and communication module, monitoring the induced voltage or the induced current on the ground wire in real time;
s102: based on the induced voltage or the induced current value, the ground wire induced voltage or the induced current value before and after the change is sent to a data processing end;
s103: according to the running current of the line and the acquired change condition of the ground wire electromagnetic signal, the mutual inductance change condition between the ground wires is reversely deduced, and the space position change condition of the lead is further reversely deduced;
s104: and reversely pushing the wind deflection condition of the line according to the change condition of the space position of the wire, and sending out an alarm when the wind deflection condition exceeds a threshold value.
According to the wind deflection monitoring method for the overhead line based on the ground wire electromagnetic signal, the voltage monitoring device or the current monitoring device is arranged on the ground wire of the overhead line, and the induced voltage or the induced current on the ground wire is monitored in real time by combining with a matched data processing and communication module; when the induced voltage or the induced current changes, the ground wire induced voltage or the induced current value before and after the change is judged by the related module and then sent to the data processing end; reversely deducing the mutual inductance change condition between the ground wires by combining the change condition of the running current of the circuit and the collected change condition of the ground wire electromagnetic signals, and reversely pushing the space position change condition of the wires based on the mutual inductance change condition between the wires and the ground wires; and reversely pushing the wind deflection condition of the line according to the change condition of the space position of the wire, and sending out an alarm when the wind deflection condition exceeds a threshold value. Therefore, the problems of more sensors, high cost and difficult installation related to the existing method can be solved, meanwhile, the technical problems that the calculation principle of the existing method is complex and the normal operation of a circuit can be influenced when the sensor fails can be solved, the spatial position of the circuit can be judged through the information of an electromagnetic signal of a ground wire and a current of a lead, meanwhile, no additional power supply is needed, the online monitoring of the spatial position of the circuit can be realized, and the installed device is small in size and low in fault cost and does not influence the normal operation of the circuit when the fault occurs. The wind deflection condition monitoring method for judging the power transmission wire based on the induced voltage on the segmented insulating ground wire or the induced current change condition on the OPGW is simple in principle, low in cost, simple and convenient to install and maintain and high in feasibility.
The overhead line wind deflection monitoring method based on the ground wire electromagnetic signals can be used for carrying out real-time on-line monitoring on the wind deflection condition of the overhead line conductor, namely judging the wind deflection condition of the overhead line conductor by monitoring the induced voltage or the induced current on the ground wire.
When the alternating current transmission line is normally electrified and operated, alternating current in the lead can generate a changing magnetic field in space, when the changing magnetic field acts on a loop formed by 'ground wire-ground' or two ground wires, induced voltage is generated, and then induced current is generated, the basic principle of the phenomenon is Faraday electromagnetic induction law, and the schematic diagram is shown in fig. 3, and the Faraday electromagnetic induction law is expressed as:
when wind deflection occurs on the line, the wire takes the hanging point as an axis and the sag as a radius under the action of wind, and position deviation occurs in space, namely, the distance between the wire and the ground wire changes, so that mutual inductance between the wire and the ground wire changes, induced voltage and induced current on the ground wire also change at a certain time of line current, and the more the wind deflection is serious, the larger the change of an electromagnetic signal of the ground wire is, so that the wind deflection condition of the line can be monitored on line by utilizing the electromagnetic signal of the ground wire. As shown in fig. 5.
Further, in an embodiment of the present invention, in combination with the line running current and the collected change situation of the ground electromagnetic signal, the mutual inductance change situation between the ground lines is reversely deduced, and based on this, the method further reversely pushes the change situation of the space position of the wire, which includes:
analyzing and judging the mutual inductance change condition between the conductors and the ground wires based on the monitored ground wire voltage or current change condition;
reversely deducing the change condition of the distance between the ground wires according to the change condition of the mutual inductance between the ground wires;
and further refining according to the change condition of the distance between the lead and the ground wire to obtain the change condition of the space position of the lead.
The mutual inductance change condition between the lead and the ground wire is obtained through the ground wire electromagnetic signal change condition, and a first formula is expressed as follows:
E G ＝Z GL I L ，
wherein E is G Z is the voltage drop per unit length on the ground wire GL For mutual inductance between the leading and the ground wires, I L Is the wire current;
the change condition of the distance between the lead and the ground wires is obtained through the change condition of the mutual inductance of the lead and the ground wires, and the second formula is expressed as follows:
wherein Z is ij Represents mutual inductance between the ith lead and ground wire and the jth lead and ground wire, d ij D is the distance between the ith conductor and the jth conductor g The unit is m, which is the equivalent depth of the mirror image of the lead to the earth, is preferable
Wherein ρ is soil resistivity (Ω·m), and f is power frequency (Hz);
when analyzing the problem of the change of the distance between the conductive wires caused by windage yaw, a conductive wire equation considering sag needs to be introduced first. Since the distance between two suspension points of the overhead transmission line is large, the influence of the rigidity of the conductor on the shape of the conductor when the conductor is suspended is small, and the conductor can be described by a 'catenary' model, and a third formula is expressed as follows: :
wherein q is the load of the wire unit, T is the level of the wire tension, and both are parameters related to mechanics; and x is 0 、y 0 Describing the relative position of the wire, the origin of coordinates can be determined by both parameters.
Further, the method is characterized in that judgment is carried out according to the windage yaw situation of the wire, and an alarm is sent out when the maximum deviation of the wire exceeds a preset threshold value.
When the wire is winded, the wire is no longer in the form of a catenary equation in the plane, but is "inclined" longitudinally offset a distance, as shown in fig. 4.
At this point we introduce a lateral offset z to describe the distance of the wire nadir lateral offset, z being positive and negative indicating outward. If the wind forces applied to each point of the wire are considered to be uniform or not greatly different, the relationship between the transverse and longitudinal offset of the wire can be described by using a white right triangle in the figure, i.e. the transverse offset of each point is in a linear relationship with the longitudinal offset thereof.
The wire position in the whole span can be determined by two parameters of a and z, and the longitudinal offset is expressed by the following formula:
in the middle, the included angle
Specifically, the height difference of the suspension points of the wires is set to be 0, the span of the wires is 500m, the types of the selected wires are quadriclasses JLHA1/GA1-400/95, and the specific parameters are shown in table 1. The magnitude of the windage yaw degree is measured by the offset distance of the wire from the position when windless normally hangs, namely the z value in fig. 4, and the influence condition of the z value on the ground wire induced current is calculated and obtained under the ground wire running mode of common ground wire sectionally insulating and OPGW grounding tower by tower, as shown in fig. 6 (the sag of the fixed wire is 16 m). From the results we can see that the magnitude of the ground induced current is approximately proportional to the horizontal offset of the wire when windified.
Table 1 calculate specific parameters of selected wires
After the horizontal deviation change relation of the ground wire induced current along with the windage yaw is obtained, the windage yaw degree of the lead wire under the line of the model can be reversely pushed according to the monitored ground wire induced current in the follow-up practical application. The method and effect are the same when using ground wire induced voltage monitoring.
Further, in an embodiment of the present invention, the judgment is performed according to the windage condition of the wire, and an alarm is sent when the maximum deviation amount of the wire exceeds a preset threshold value. .
The overhead line windage yaw monitoring method based on the ground wire electromagnetic signals provided by the embodiment of the invention not only can monitor the line by utilizing the voltage or current signals on the ground wire, but also can be used for supplying power to the monitoring device, thereby realizing the aim of self-power supply and even supplying power to other devices. Meanwhile, the method has the following advantages and characteristics: the on-line monitoring of the wind deflection state of the self-powered line can be realized without an additional power supply; the principle is simple, the cost is low, the feasibility is high, and the installation and maintenance are simple and convenient; the equipment has small volume and low fault cost, and does not influence the normal operation of the circuit.
In order to achieve the above purpose, the invention also provides an overhead line wind deflection monitoring device based on the ground wire electromagnetic signal.
Fig. 2 is a schematic structural diagram of an overhead line wind deflection monitoring device based on a ground wire electromagnetic signal according to an embodiment of the present invention.
As shown in fig. 2, the overhead line wind deflection monitoring device based on the ground wire electromagnetic signal includes: the system comprises a monitoring module 10, a collecting module 20, an analyzing module 30 and a warning module 40, wherein the monitoring module 10 is used for installing a voltage monitoring device or a current monitoring device on an overhead line ground wire and monitoring the induced voltage or the induced current on the ground wire in real time by combining with a matched data processing and communication module; the analysis module 30 is used for reversely pushing the mutual inductance change condition between the wire and the ground wire according to the line running current and the collected ground wire electromagnetic signal change condition, and reversely pushing the spatial position change condition of the wire based on the mutual inductance change condition between the wire and the ground wire; the warning module 40 is configured to reverse the wind deflection of the line according to the change of the spatial position of the wire, and send out an alarm when the wind deflection exceeds a threshold value.
Further, in the embodiment of the application, the device further comprises a power supply module, and the power supply module is used for supplying power to the monitoring device by using the induced voltage or the induced current on the ground line so as to realize self power supply.
The overhead line wind deflection monitoring device based on the ground wire electromagnetic signal provided by the embodiment of the invention not only can monitor a line by utilizing a voltage or current signal on a ground wire, but also can be used for supplying power to the monitoring device, so that the aim of self-power supply and even power supply for other devices is fulfilled. Meanwhile, the method has the following advantages and characteristics: the on-line monitoring of the wind deflection state of the self-powered line can be realized without an additional power supply; the principle is simple, the cost is low, the feasibility is high, and the installation and maintenance are simple and convenient; the equipment has small volume and low fault cost, and does not influence the normal operation of the circuit.
In order to implement the above embodiment, the application further proposes a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the overhead line wind deflection monitoring method based on the ground wire electromagnetic signal of the above embodiment.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (7)
1. An overhead line windage yaw monitoring method based on ground wire electromagnetic signals is characterized by comprising the following steps:
installing a voltage monitoring device or a current monitoring device on an overhead line ground wire, and combining with a matched data processing and communication module, monitoring the induced voltage or the induced current on the ground wire in real time;
when the induced voltage or the induced current changes, the ground wire induced voltage or the induced current value before and after the change is judged by the related module and then sent to the data processing end;
reversely deducing the mutual inductance change condition between the ground wires by combining the running current of the circuit and the collected change condition of the ground wire electromagnetic signals, and reversely pushing the space position change condition of the wire based on the mutual inductance change condition between the wire and the ground wires;
reversely pushing the wind deflection condition of the line according to the change condition of the space position of the wire, and sending out an alarm when the wind deflection condition exceeds a threshold value;
the method for reversely pushing the space position change condition of the wire based on the mutual inductance change condition between the wire and the ground wire comprises the following steps of:
a wire equation was introduced that accounts for sag, expressed as:
where q is the load of the wire unit, T is the horizontal tension of the wire, x 0 、y 0 Describing the relative positions of the wires;
when the wire is winded, introducing a transverse offset z to describe the transverse offset distance of the lowest point of the wire, wherein z is positive and outward, and is negative and inward, and the longitudinal offset is expressed by the following formula:
wherein the included angle is
And the magnitude of the ground wire induced current is proportional to the wire offset during windage according to calculation.
2. The method of claim 1, wherein said combining the line operating current magnitude with the collected ground electromagnetic signal variation, deriving, and the ground-to-ground mutual inductance variation, further reversing the wire spatial position variation based thereon, comprises:
analyzing and judging the mutual inductance change condition between the conductors and the ground wires based on the monitored ground wire voltage or current change condition;
reversely deducing the change condition of the distance between the ground wires according to the change condition of the mutual inductance between the ground wires;
and further refining according to the change condition of the distance between the lead and the ground wire to obtain the change condition of the space position of the lead.
3. The method of claim 1, wherein the determining is based on a windage condition of the wire, and wherein an alarm is raised when a maximum deflection of the wire exceeds a predetermined threshold.
4. The method of claim 1, further comprising powering the monitoring device with an induced voltage or an induced current on the ground line to achieve self-powering.
5. The overhead line windage yaw monitoring device based on the ground wire electromagnetic signal is characterized by comprising a voltage or current monitoring module, a data transmission module, a data processing module and an on-line monitoring module, wherein,
the voltage or current monitoring module is used for installing a voltage monitoring device or a current monitoring device on an overhead line ground wire and monitoring the induced voltage or the induced current on the ground wire in real time by combining with the matched data processing and communication module;
the data transmission module is used for transmitting the ground wire induced voltage or induced current value before and after the change to the data processing end after the judgment of the related module when the induced voltage or induced current changes;
the data processing module is used for reversely deducing the mutual inductance change condition between the ground wires according to the line running current change condition and the acquired ground wire electromagnetic signal change condition and reversely pushing the space position change condition of the lead wires according to the mutual inductance change condition between the lead wires and the ground wires;
the on-line monitoring module is used for reversely pushing the wind deflection condition of the line according to the change condition of the space position of the wire and sending out an alarm when the wind deflection condition exceeds a threshold value;
the method for reversely pushing the space position change condition of the wire based on the mutual inductance change condition between the wire and the ground wire comprises the following steps of:
a wire equation was introduced that accounts for sag, expressed as:
where q is the load of the wire unit, T is the horizontal tension of the wire, x 0 、y 0 Describing the relative positions of the wires;
when the wire is winded, introducing a transverse offset z to describe the transverse offset distance of the lowest point of the wire, wherein z is positive and outward, and is negative and inward, and the longitudinal offset is expressed by the following formula:
wherein the included angle is
And the magnitude of the ground wire induced current is proportional to the wire offset during windage according to calculation.
6. The apparatus of claim 5, further comprising a power module for powering the monitoring device with an induced voltage or an induced current on the ground line to achieve self-powering.
7. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the method according to any of claims 1-4.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111477325.5A CN114396859B (en) | 2021-12-06 | 2021-12-06 | Overhead line windage yaw monitoring method and device based on ground wire electromagnetic signals |
| PCT/CN2022/092079 WO2023103278A1 (en) | 2021-12-06 | 2022-05-10 | Online monitoring method for position information of conducting wire of power transmission line based on electromagnetic signal of ground wire |
| US18/408,026 US20240142509A1 (en) | 2021-12-06 | 2024-01-09 | Online monitoring method for dynamic changes in positions of transmission line conductors based on electromagnetic signals of ground wires |
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| CN202111477325.5A CN114396859B (en) | 2021-12-06 | 2021-12-06 | Overhead line windage yaw monitoring method and device based on ground wire electromagnetic signals |
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