CN114396860A - Sag monitoring method and device during capacity increase of power transmission line based on ground wire electromagnetic signal - Google Patents
Sag monitoring method and device during capacity increase of power transmission line based on ground wire electromagnetic signal Download PDFInfo
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Abstract
The application provides a sag monitoring method during capacity increasing of a power transmission line based on a ground wire electromagnetic signal, which relates to the technical field of high voltage and comprises the following steps: installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line, and monitoring the induced voltage or the induced current on the ground wire in real time by combining a matched data processing and communication module; when the induced voltage or the induced current changes, the induced voltage or the induced current value of the ground wire before and after the change is judged by the relevant module and then is sent to the data processing end; the change condition of the line running current and the change condition of the collected ground wire electromagnetic signals are combined, the mutual inductance change condition between the ground wires is reversely deduced, and the change condition of the conductor sag is further reversely deduced on the basis of the mutual inductance change condition; and realizing the online monitoring of the sag condition during the capacity increasing of the power transmission line according to the sag change condition of the wire. The method and the device can monitor the sag state of the circuit on line in a self-powered manner, an additional power supply is not needed, and the normal operation of the circuit is not influenced when the monitoring device breaks down.
Description
Technical Field
The application relates to the technical field of high voltage, in particular to a sag monitoring method and device during capacity increasing of a power transmission line based on a ground wire electromagnetic signal.
Background
With the rapid development of economy and society, the demand of production and life of people on electricity utilization is increasingly improved, and part of lines are restricted by the technical specifications of the existing power transmission lines, so that the increase of power transmission capacity is severely limited. In order to solve the problem, related experts propose a scheme of line capacity increase, namely, the existing technical specification of the line is broken through, and the operation temperature permitted by a lead is increased by 10 or 20 ℃, so that the capacity of the line for transmitting electric energy is improved. However, due to the rise of the temperature of the circuit, the lead expands with heat and contracts with cold, and further the sag of the lead is increased. When the conductor sag is too large, the normal operation of the power transmission line and the safety of the surrounding objects can be endangered, so the sag of the line needs to be monitored in real time when the line is subjected to capacity expansion.
The current commonly used method for monitoring the circuit sag is to install a plurality of tension sensors on a wire and judge the sag condition of the circuit wire in a mechanical analysis mode. However, this method involves many sensors, is costly and difficult to install, and has a complex calculation principle, and may affect the normal operation of the line when the sensor fails.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a sag monitoring method during capacity increase of a power transmission line based on a ground wire electromagnetic signal, which solves the problems of more sensors, high cost and difficulty in installation in the existing method, and also solves the technical problems that the existing method has a complex calculation principle and affects the normal operation of the line when the sensor fails, can determine the sag condition of the line according to information of the ground wire electromagnetic signal and the current of the wire, and meanwhile, without an additional power supply, can realize the online monitoring of the sag state of the line in a self-powered manner, and the installed device has a small volume and low failure cost, and does not affect the normal operation of the line when the failure occurs. The lead sag monitoring method during the capacity expansion of the Overhead line based on the induced voltage of the segmented insulation Ground Wire or the induced current of the OPGW (Optical Fiber Composite Overhead Ground Wire) has the advantages of simple principle, low cost, simplicity and convenience in installation and maintenance and high feasibility.
The second purpose of the application is to provide a sag monitoring device during capacity increasing of a power transmission line based on an electromagnetic signal of a ground wire.
A third object of the present application is to propose a non-transitory computer-readable storage medium.
In order to achieve the above object, an embodiment of the first aspect of the present application provides a sag monitoring method during capacity increase of a power transmission line based on a ground line electromagnetic signal, including: installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line, and monitoring the induced voltage or the induced current on the ground wire in real time by combining a matched data processing and communication module; when the induced voltage or the induced current changes, the induced voltage or the induced current value of the ground wire before and after the change is judged by the relevant module and then is sent to the data processing end; the change condition of the line running current and the change condition of the collected ground wire electromagnetic signals are combined, the mutual inductance change condition between the ground wires is reversely deduced, and the change condition of the conductor sag is further reversely deduced on the basis of the mutual inductance change condition; and realizing the online monitoring of the sag condition during the capacity increasing of the power transmission line according to the sag change condition of the wire.
Optionally, in an embodiment of the present application, in combination with a change of a line operating current and a change of an acquired ground line electromagnetic signal, reversely deducing a mutual inductance change between the ground lines, and further reversely deducing a change of a conductor sag based on the mutual inductance change, the method includes:
the change condition of the current of the conducting wire and the change condition of the voltage or the current of the monitored ground wire during dynamic capacity increasing are comprehensively considered to analyze and judge the change condition of the mutual inductance between the conducting wire and the ground wire;
reversely deducing the distance change situation between the conducting ground lines according to the mutual inductance change situation between the conducting ground lines;
and further thinning the change situation of the sag of the wire according to the change situation of the distance between the wires and the ground.
Optionally, in an embodiment of the present application, the determination is performed according to a change condition of the wire sag, and an alarm is issued when the maximum wire sag exceeds a preset threshold.
Optionally, in an embodiment of the present application, the monitoring device is powered by an induced voltage or an induced current on a ground line, so as to realize self-powering.
In order to achieve the above object, a sag monitoring device during capacity increase of a power transmission line based on an electromagnetic signal of a ground wire is provided in an embodiment of the second aspect of the present application, which includes a voltage or current monitoring module, a data transmission module, a data processing module, and an online monitoring module,
the voltage or current monitoring module is used for installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line and monitoring the induced voltage or the induced current on the ground wire in real time by combining a matched data processing and communication module;
the data transmission module is used for transmitting the ground wire induction voltage or the induction current value before and after the change to the data processing end after the judgment of the relevant module when the induction voltage or the induction current changes;
the data processing module is used for reversely deducing the mutual inductance change condition between the ground wires by combining the change condition of the line running current and the collected change condition of the ground wire electromagnetic signals and further reversely deducing the sag change condition of the lead wires based on the mutual inductance change condition;
and the online monitoring module is used for realizing online monitoring of the sag condition during capacity increasing of the power transmission line according to the change condition of the sag of the wire.
Optionally, in an embodiment of the present application, the monitoring device further includes a power supply module, configured to supply power to the monitoring device by using the induced voltage or the induced current on the ground line, so as to achieve self-power.
In order to achieve the above object, a non-transitory computer-readable storage medium is provided in an embodiment of the third aspect of the present application, and when executed by a processor, the instructions in the storage medium can perform a sag monitoring method based on power line capacity increase of a ground electromagnetic signal.
The sag monitoring method during capacity increasing of the power transmission line based on the ground wire electromagnetic signal, the sag monitoring device during capacity increasing of the power transmission line based on the ground wire electromagnetic signal and the non-transitory computer readable storage medium solve the problems that the existing method involves more sensors, is high in cost and is difficult to install, solve the technical problems that the existing method is complex in calculation principle and can affect the normal operation of the line when the sensors fail, can judge the sag condition of the line through the information of the ground wire electromagnetic signal and the current of the conducting wire, do not need an additional power supply, can realize the self-powered on-line monitoring of the sag state of the line, are small in size and low in failure cost, and do not affect the normal operation of the line when the failure occurs. The method for monitoring the sag of the conducting wire during the capacity expansion of the overhead line based on the segmented insulation ground wire induced voltage or the OPGW induced current is simple in principle, low in cost, simple and convenient to install and maintain and high in feasibility.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a sag monitoring method during capacity increase of a power transmission line based on an electromagnetic signal of a ground wire according to a first embodiment of the present application;
fig. 2 is a schematic diagram of faraday's law of electromagnetic induction of the sag monitoring method during capacity expansion of the power transmission line based on the ground wire electromagnetic signal in the embodiment of the present application;
fig. 3 is a schematic block diagram of a sag monitoring method during capacity increase of a power transmission line based on a ground electromagnetic signal according to an embodiment of the present application;
fig. 4 is a schematic view of calculating a conductor sag of the sag monitoring method during capacity increase of the power transmission line based on the ground wire electromagnetic signal according to the embodiment of the present application;
fig. 5 is a schematic view of a monitoring scheme of the sag monitoring method during capacity increase of the power transmission line based on the ground wire electromagnetic signal according to the embodiment of the present application;
fig. 6 is a schematic diagram illustrating an influence of conductor sag on a ground current under different-phase currents in the sag monitoring method for power transmission line capacity increase based on the ground electromagnetic signal according to the embodiment of the present application;
fig. 7 is a schematic diagram illustrating an influence of conductor sag on voltages at two ends of a ground insulator under different-phase currents in the sag monitoring method for power transmission line capacity increase based on the ground electromagnetic signal according to the embodiment of the present application;
fig. 8 is a schematic structural diagram of a sag monitoring device during capacity increase of a power transmission line based on an electromagnetic signal of a ground wire according to a second embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The sag monitoring method and device during power transmission line capacity increase based on the ground line electromagnetic signal according to the embodiments of the present application are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a sag monitoring method during capacity increase of a power transmission line based on an electromagnetic signal of a ground line according to an embodiment of the present application.
As shown in fig. 1, the sag monitoring method for the capacity increase of the power transmission line based on the ground wire electromagnetic signal comprises the following steps:
102, when the induced voltage or the induced current changes, the induced voltage or the induced current before and after the change is judged by a relevant module and then sent to a data processing end;
103, reversely deducing the mutual inductance change condition between the ground wires by combining the change condition of the line running current and the collected change condition of the ground wire electromagnetic signals, and further reversely deducing the change condition of the conductor sag based on the mutual inductance change condition;
and 104, realizing online monitoring of the sag condition during capacity increase of the power transmission line according to the sag change condition of the wire.
According to the sag monitoring method during capacity expansion of the power transmission line based on the ground wire electromagnetic signal, the voltage monitoring device or the current monitoring device is installed on the ground wire of the overhead line, and the induction voltage or the induction current on the ground wire is monitored in real time in combination with the matched data processing and communication module; when the induced voltage or the induced current changes, the induced voltage or the induced current value of the ground wire before and after the change is judged by the relevant module and then is sent to the data processing end; the change condition of the line running current and the change condition of the collected ground wire electromagnetic signals are combined, the mutual inductance change condition between the ground wires is reversely deduced, and the change condition of the conductor sag is further reversely deduced on the basis of the mutual inductance change condition; and realizing the online monitoring of the sag condition during the capacity increasing of the power transmission line according to the sag change condition of the wire. Therefore, the problems that the number of sensors related to the existing method is large, the cost is high, and the installation is difficult can be solved, the technical problems that the calculation principle of the existing method is complex, and the normal operation of a line can be influenced when the sensor fails can be solved, the sag condition of the line can be judged through the information of the ground wire electromagnetic signal and the lead current, an additional power supply is not needed, the online monitoring of the sag state of the line can be realized in a self-powered manner, the size of the installed device is small, the fault cost is low, and the normal operation of the line is not influenced when the fault occurs. The lead sag monitoring method during the capacity expansion of the Overhead line based on the induced voltage of the segmented insulation Ground Wire or the induced current of the OPGW (Optical Fiber Composite Overhead Ground Wire) has the advantages of simple principle, low cost, simplicity and convenience in installation and maintenance and high feasibility.
The power transmission line sag monitoring method based on the ground wire electromagnetic signals can be used for sag monitoring during line capacity increase, namely, sag conditions of a line are judged by monitoring induced voltage or induced current on the ground wire.
When an alternating current transmission line is in normal power-on operation, alternating current in a lead can generate a variable magnetic field in space, when the variable magnetic field acts on a loop formed by 'ground wire-earth' or two ground wires, induced voltage can be generated, and induced current is further generated, the basic principle of the phenomenon is a faraday electromagnetic induction law, and a schematic diagram is shown in fig. 2, wherein the faraday electromagnetic induction law is expressed as:
when a capacity increasing measure is taken for a line, the lead can generate sag change due to heating expansion, namely, the distance between the lead and the ground wire changes, so that mutual inductance between the lead and the ground wire changes, and therefore induced voltage and induced current on the ground wire can change along with the change of line current and can also change due to the change of sag. Therefore, under the condition of mastering the current information of the line, the sag condition of the line during capacity increase can be monitored on line by utilizing the electromagnetic signal of the ground wire. The specific schematic block diagram is shown in fig. 3.
Further, in this embodiment of the application, the mutual inductance variation between the lines is reversely deduced by combining the variation of the line operating current and the variation of the collected ground line electromagnetic signal, and the variation of the conductor sag is further reversely deduced based on this, including:
the mutual inductance change condition between the conducting wires and the ground wires is analyzed and judged by comprehensively considering the change condition of the conducting wire current and the monitored change condition of the ground wire voltage or current during dynamic capacity increasing, the mutual inductance change condition between the conducting wires and the ground wires is obtained by adopting a first formula according to the change condition of the conducting wire current and the monitored change condition of the ground wire voltage or current, and the first formula is expressed as follows:
EG＝ZGLIL
wherein E isGIs the voltage drop per unit length on the ground, ZGLFor mutual inductance between ground and conducting wires, ILIn order to make the current of the conducting wire,
taking a single-circuit transmission line with two ground wires as an example, the first formula can also be expressed as:
wherein E isg1Is the voltage drop per unit length of the first ground wire, Eg2Is the internal pressure drop per unit length of the second ground wire, Zg1aIs the mutual impedance between the first ground line and the a-phase conductor, Zg1bIs the mutual impedance between the first ground line and the b-phase conductor, Zg1cIs the mutual impedance between the first ground line and the c-phase conductor, Zg2aEquivalent reason, IaIs a phase conductor current, IbIs a b-phase conductor current, IcIs the c-phase wire current.
And reversely deducing the distance change situation between the ground wires according to the mutual inductance change situation between the ground wires by using a second formula, wherein the second formula is expressed as follows:
wherein Z isijThe mutual inductance between the ith ground wire and the jth ground wire is expressed, wherein omega is 2 pi f, f is the frequency of the electric signal of the lead wire, DgFor the equivalent depth of the conductor to the earth mirror image, in m, preferably
Where ρ is the resistivity of the soil (Ω. m), dijIs the distance between the ith conductor and the jth conductor.
In actual simulation and calculation, the mutual inductance between the conducting wires and the ground can be calculated in a numerical integration mode, so that more accurate position information of each point of the conducting wires can be obtained. The mutual impedance may be approximately considered equal to the mutual inductance value. Taking the calculation of the mutual impedance between the a-phase conducting wire and the first ground as an example, the conducting wire is divided into n small segments, and the sum is accumulated after the calculation, which can be expressed as:
wherein Z isg1aIs the mutual impedance between the first ground wire and the a-phase conductor, where ω is 2 π f and f is the conductorFrequency (Hz), d of electric signalsg1a(i) The distance between the ith segment of the lead and the ground wire.
Further thinning the change condition of the sag of the wire according to the change condition of the distance between the wires and the ground by adopting a third formula, wherein the third formula is expressed as follows:
where y denotes the vertical position of the wire at x, beta is the elevation difference angle,
h is the height difference of suspension points at two ends of the wire, l represents the length of the line span, and gamma is the specific load of the wire and has the unit of N/(m.mm)2)，σ0The horizontal stress of each point of the wire is expressed in the unit of N/mm2. When calculating the arc sag of the wire, a catenary model of the wire is applied, and for the consideration of simple calculation, a flat parabolic formula is used for replacing a related catenary formula, and a suspension point at one end of the wire is taken as an origin. y corresponds to y in fig. 4, that is, after one end of a certain segment of the wire (or the ground wire) is selected as an origin, the position of the wire in the vertical direction at each position in the segment is selected.
For a certain section of actual transmission line, the suspension points at the two ends of the conducting wire and the ground wire are fixed, so that when the line normally operates, the positions of the conducting wire and the ground wire on the vertical space can be calculated by a third formula (gamma and sigma when the line operates under the rated working condition)0Both parameters are known), i.e. both the conductor and the ground have a sag but the relative position of the two is unchanged.
When the line is subjected to capacity increase, the current of the wire is increased, the heat generation is increased, the wire is heated to expand, and gamma and sigma in a third formula0Both parameters are changed. The method obtains the distance change condition of the ground wire by using the change condition of the ground wire voltage or current signal, and can obtain the positions of the lead wire because the positions of the ground wire are unchanged and are obtained by the calculation of the third formula at first.
The third formula can calculate the position of the original ground wire in the vertical direction, and then the position of each point of the augmented conductor in the vertical direction, namely the sag change condition, is obtained by combining the change of the distance between the ground wire and the conductor.
Further, in the embodiment of the application, the judgment is performed according to the change condition of the conductor sag, and an alarm is given when the maximum conductor sag exceeds a preset threshold.
Further, in the embodiment of the present application, not only the line may be monitored by using the induced voltage or the induced current on the ground line, but also the monitoring device may be powered by using the induced voltage or the induced current on the ground line, so as to achieve the goal of self-powering and even powering another device.
Fig. 4 is a schematic view of calculating a conductor sag of the sag monitoring method during capacity increase of the power transmission line based on the ground wire electromagnetic signal according to the embodiment of the present application.
As shown in FIG. 4, A, B is the hanging point at both ends of the wire, O is the lowest point of the catenary model of the wire, i.e. the maximum sag, h is the height difference between the two hanging points of the wire, l is the horizontal distance between the two hanging points of the wire, i.e. the line span, fmThe maximum sag of the wire.
Fig. 5 is a schematic view of a monitoring scheme of the sag monitoring method during capacity increase of the power transmission line based on the ground line electromagnetic signal according to the embodiment of the present application.
As shown in fig. 5, in the sag monitoring method during capacity expansion of the power transmission line based on the ground wire electromagnetic signal, the sag condition of the line needs to be judged according to the information of the ground wire electromagnetic signal and the current of the wire, and the induced voltage or the induced current on the ground wire is monitored in real time by installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line and combining a matched data processing and communication module, wherein a voltage sensor monitors the voltages at two ends of a segment ground wire insulator, and a current sensor monitors the induced current on the OPGW; when the induced voltage or the induced current changes, the induced voltage or the induced current value of the ground wire before and after the change is judged by the relevant module and then is sent to the data processing end; the change condition of the line running current and the change condition of the collected ground wire electromagnetic signals are combined, the mutual inductance change condition between the ground wires is reversely deduced, and the change condition of the conductor sag is further reversely deduced on the basis of the mutual inductance change condition; an alarm is raised when the maximum sag of the wire exceeds a certain threshold.
In the embodiment of the application, the height difference of the suspension points of the wires is set to be 0, the span of the wires is set to be 500m, the selected wire type is the four-split JHA 1/GA1-400/95, and the specific parameters are shown in the table I.
Fig. 6 is a schematic diagram illustrating an influence of conductor sag on a ground current under different-phase currents in the sag monitoring method for power transmission line capacity increase based on the ground electromagnetic signal according to the embodiment of the present application.
As shown in fig. 6, when the ground line operating mode is the double OPGW tower-by-tower grounding and the line conductor current is constant, the ground line induced current signal decreases approximately linearly with the increase of the maximum sag of the conductor, and the change of the conductor sag can be reversely deduced according to the current change condition of the ground line by using the rule.
Fig. 7 is a schematic diagram illustrating an influence of conductor sag on voltages at two ends of a ground insulator under different-phase currents in the sag monitoring method for power transmission line capacity increase based on the ground electromagnetic signal according to the embodiment of the present application.
As shown in fig. 7, when the ground line operation mode is the common ground line segment insulation, the OPGW is grounded tower by tower, and the current of the line conductor is constant, the induced voltage signal of the ground line decreases approximately linearly with the increase of the maximum sag of the conductor, and the change of the conductor sag can be reversely deduced according to the voltage change condition of the ground line by using the rule.
After the change relation of the induced voltage of the ground line induced current under different conductor currents along with the circuit sag is obtained, the conductor sag condition under the circuit of the type can be reversely deduced according to the monitored ground line induced signal in subsequent practical application.
Fig. 8 is a schematic structural diagram of a sag monitoring device during capacity increase of a power transmission line based on an electromagnetic signal of a ground wire according to a second embodiment of the present application.
As shown in fig. 8, the sag monitoring device during capacity increase of the power transmission line based on the ground electromagnetic signal comprises a voltage or current monitoring module 10, a data transmission module 20, a data processing module 30 and an online monitoring module 40, wherein,
the voltage or current monitoring module 10 is used for installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line, and monitoring the induced voltage or the induced current on the ground wire in real time by combining a matched data processing and communication module;
the data transmission module 20 is used for transmitting the ground wire induction voltage or the induction current value before and after the change to the data processing end after the judgment of the relevant module when the induction voltage or the induction current changes;
the data processing module 30 is used for reversely deducing the mutual inductance change condition between the ground wires by combining the change condition of the line running current and the collected change condition of the ground wire electromagnetic signals and further reversely deducing the change condition of the conductor sag based on the mutual inductance change condition;
and the online monitoring module 40 is used for realizing online monitoring of the sag condition during capacity increase of the power transmission line according to the change condition of the sag of the wire.
Further, in the embodiment of the present application, the monitoring device further includes a power supply module, configured to supply power to the monitoring device by using an induced voltage or an induced current on a ground line, so as to realize self-power supply.
The sag monitoring device during capacity expansion of the power transmission line based on the ground wire electromagnetic signal comprises a voltage or current monitoring module, a data transmission module, a data processing module and an online monitoring module, wherein the voltage or current monitoring module is used for installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line and monitoring induced voltage or induced current on the ground wire in real time by combining a matched data processing and communication module; the data transmission module is used for transmitting the ground wire induction voltage or the induction current value before and after the change to the data processing end after the judgment of the relevant module when the induction voltage or the induction current changes; the data processing module is used for reversely deducing the mutual inductance change condition between the ground wires by combining the change condition of the line running current and the collected change condition of the ground wire electromagnetic signals and further reversely deducing the sag change condition of the lead wires based on the mutual inductance change condition; and the online monitoring module is used for realizing online monitoring of the sag condition during capacity increasing of the power transmission line according to the change condition of the sag of the wire. Therefore, the problems that the number of sensors related to the existing method is large, the cost is high, and the installation is difficult can be solved, the technical problems that the calculation principle of the existing method is complex, and the normal operation of a line can be influenced when the sensor fails can be solved, the sag condition of the line can be judged through the information of the ground wire electromagnetic signal and the lead current, an additional power supply is not needed, the online monitoring of the sag state of the line can be realized in a self-powered manner, the size of the installed device is small, the fault cost is low, and the normal operation of the line is not influenced when the fault occurs. The method for monitoring the sag of the conducting wire during the capacity expansion of the overhead line based on the segmented insulation ground wire induced voltage or the OPGW induced current is simple in principle, low in cost, simple and convenient to install and maintain and high in feasibility.
In order to implement the foregoing embodiments, the present application further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the sag monitoring method when the power transmission line capacity increases based on the ground line electromagnetic signal of the foregoing embodiments.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited 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 steps of a custom logic function or process, and alternate 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 present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement 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). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can 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 should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (7)
1. A sag monitoring method during capacity increasing of a power transmission line based on an electromagnetic signal of a ground wire is characterized by comprising the following steps:
installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line, and monitoring the induced voltage or the induced current on the ground wire in real time by combining a matched data processing and communication module;
when the induced voltage or the induced current changes, the induced voltage or the induced current value of the ground wire before and after the change is judged by the relevant module and then is sent to the data processing end;
the change condition of the line running current and the change condition of the collected ground wire electromagnetic signals are combined, the mutual inductance change condition between the ground wires is reversely deduced, and the change condition of the conductor sag is further reversely deduced on the basis of the mutual inductance change condition;
and realizing the online monitoring of the sag condition during the capacity increasing of the power transmission line according to the sag change condition of the wire.
2. The method of claim 1, wherein the step of further reversely deducing the change condition of the conductor sag based on the reversely deduced change condition of the mutual inductance between the ground and the collected change condition of the ground electromagnetic signal in combination with the change condition of the line operating current magnitude comprises:
the change condition of the current of the conducting wire and the change condition of the voltage or the current of the monitored ground wire during dynamic capacity increasing are comprehensively considered to analyze and judge the change condition of the mutual inductance between the conducting wire and the ground wire;
reversely deducing the distance change situation between the conducting ground lines according to the mutual inductance change situation between the conducting ground lines;
and further thinning the change situation of the sag of the wire according to the change situation of the distance between the wires and the ground.
3. The method of claim 1, wherein the determination is made based on a change in the sag of the wire, and an alarm is issued when the maximum sag 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 a ground line to achieve self-powering.
5. A sag monitoring device during capacity increase of a power transmission line based on an electromagnetic signal of a ground wire is characterized by comprising a voltage or current monitoring module, a data transmission module, a data processing module and an online monitoring module, wherein,
the voltage or current monitoring module is used for installing a voltage monitoring device or a current monitoring device on the ground wire of the overhead line and monitoring the induced voltage or the induced current on the ground wire in real time by combining a matched data processing and communication module;
the data transmission module is used for transmitting the ground wire induction voltage or induction current value before and after the change to the data processing end after the judgment of the relevant module when the induction voltage or induction current changes;
the data processing module is used for reversely deducing the mutual inductance change condition between the ground wires by combining the change condition of the line running current and the collected change condition of the ground wire electromagnetic signals and further reversely deducing the sag change condition of the lead wires based on the mutual inductance change condition;
the online monitoring module is used for realizing online monitoring of the sag condition during capacity increasing of the power transmission line according to the change condition of the sag of the wire.
6. The device of claim 5, further comprising a power module for powering the monitoring device with the induced voltage or the induced current on the ground to achieve self-powering.
7. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the method of any one of claims 1-4.
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| CN202111479145.0A CN114396860B (en) | 2021-12-06 | 2021-12-06 | Method and device for monitoring sag during capacity expansion of power transmission line 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023103278A1 (en) * | 2021-12-06 | 2023-06-15 | 清华大学 | Online monitoring method for position information of conducting wire of power transmission line based on electromagnetic signal of ground wire |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4596952A (en) * | 1983-01-26 | 1986-06-24 | Goff John G | Method using proximity sensor mounted on rotatable shaft for determining turbine seal clearance |
| JPH04120478A (en) * | 1990-09-11 | 1992-04-21 | Tokyo Electric Power Co Inc:The | Determining method of direction of fault of trans mission line |
| EP0766809A1 (en) * | 1994-06-20 | 1997-04-09 | Hafslund ASA | Apparatus for monitoring overhead electric lines |
| CN106990310A (en) * | 2017-05-03 | 2017-07-28 | 中国南方电网有限责任公司电网技术研究中心 | Overhead transmission conductor capacity characteristic monitoring system, testing method and device |
| CN108801442A (en) * | 2018-06-06 | 2018-11-13 | 清华大学 | A kind of transmission line galloping monitoring method based on ground wire induced voltage |
| CN109000716A (en) * | 2018-06-06 | 2018-12-14 | 清华大学 | One kind being based on the faradic transmission line galloping monitoring method of OPGW ground wire |
| WO2019147965A1 (en) * | 2018-01-26 | 2019-08-01 | LineVision, Inc. | System and method for power transmission line monitoring |
| CN211042330U (en) * | 2020-06-02 | 2020-07-17 | 天津滨电电力工程有限公司 | Dynamic capacity-increasing comprehensive monitoring device based on multi-dimensional sensing data |
| CN212871085U (en) * | 2020-09-08 | 2021-04-02 | 国网浙江省电力有限公司舟山供电公司 | Overhead transmission line sag on-line measurement system |
| US20210172729A1 (en) * | 2017-12-18 | 2021-06-10 | The Curators Of The University Of Missouri | Real-time overhead power line sag monitoring |
-
2021
- 2021-12-06 CN CN202111479145.0A patent/CN114396860B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4596952A (en) * | 1983-01-26 | 1986-06-24 | Goff John G | Method using proximity sensor mounted on rotatable shaft for determining turbine seal clearance |
| JPH04120478A (en) * | 1990-09-11 | 1992-04-21 | Tokyo Electric Power Co Inc:The | Determining method of direction of fault of trans mission line |
| EP0766809A1 (en) * | 1994-06-20 | 1997-04-09 | Hafslund ASA | Apparatus for monitoring overhead electric lines |
| CN106990310A (en) * | 2017-05-03 | 2017-07-28 | 中国南方电网有限责任公司电网技术研究中心 | Overhead transmission conductor capacity characteristic monitoring system, testing method and device |
| US20210172729A1 (en) * | 2017-12-18 | 2021-06-10 | The Curators Of The University Of Missouri | Real-time overhead power line sag monitoring |
| WO2019147965A1 (en) * | 2018-01-26 | 2019-08-01 | LineVision, Inc. | System and method for power transmission line monitoring |
| CN108801442A (en) * | 2018-06-06 | 2018-11-13 | 清华大学 | A kind of transmission line galloping monitoring method based on ground wire induced voltage |
| CN109000716A (en) * | 2018-06-06 | 2018-12-14 | 清华大学 | One kind being based on the faradic transmission line galloping monitoring method of OPGW ground wire |
| CN211042330U (en) * | 2020-06-02 | 2020-07-17 | 天津滨电电力工程有限公司 | Dynamic capacity-increasing comprehensive monitoring device based on multi-dimensional sensing data |
| CN212871085U (en) * | 2020-09-08 | 2021-04-02 | 国网浙江省电力有限公司舟山供电公司 | Overhead transmission line sag on-line measurement system |
Non-Patent Citations (3)
| Title |
|---|
| 刘欣等: "考虑导线弧垂的雷电感应电压计算与分析", 《华北电力大学学报(自然科学版)》 * |
| 戴沅;钟卓颖;邓小康;阳韬;: "基于弧垂实时测量的电力线路动态增容方法" * |
| 李霖;: "浅议使用增容导线时如何进行定位弧垂计算" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023103278A1 (en) * | 2021-12-06 | 2023-06-15 | 清华大学 | Online monitoring method for position information of conducting wire of power transmission line based on electromagnetic signal of ground wire |
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