Icing galloping monitoring and early warning device and method for power transmission line

Abstract

The invention relates to the field of signal early warning devices, in particular to an icing galloping monitoring and early warning device and method for a power transmission line, and the method comprises the steps: analyzing the ice layer extrusion force of the line skin of the power transmission line in different periods, and screening out a plurality of efficient icing periods; analyzing irregular vibration conditions of the power transmission line during galloping in different efficient icing periods, and filtering part of frequency interference signals contained in a line vibration sequence to obtain low-frequency signals and high-frequency signals; comparing the content conditions of the high-frequency and low-frequency signals of the power transmission line in different efficient icing periods to obtain the low-frequency effective occupancy of the line; according to the icing hardness of the outer skin of the line, the pressure bearing capacity of the power transmission line to metal in the line during galloping in different efficient icing periods is comprehensively analyzed, and icing galloping monitoring and early warning are carried out. According to the invention, the timeliness and accuracy of detection and early warning are improved.

Description

Technical Field

[0001] The present invention relates to the field of signal warning devices, and particularly to an icing galloping monitoring and warning device and method for transmission lines. Background Art

[0002] Icing galloping refers to the phenomenon that when a transmission line encounters ice and snow weather, due to the uneven attachment of ice and snow to the wire or other equipment, the load and weight of the line increase, resulting in the vibration of the line. This vibration is usually the result of the combined action of factors such as wind force and the accumulation of ice and snow, which may pose certain safety hazards to the transmission line, such as wire breakage, equipment damage, and even large-scale power outages. Therefore, the monitoring and warning of icing galloping are crucial parts of transmission line management.

[0003] When the prior art monitors the transmission line by installing sensors, it is easy to generate different thicknesses of icing stages due to extreme weather factors, causing different amplitudes of vibration between transmission lines, generating different electromagnetic interferences, interfering with the distinction of the loss situation of the metal conductors inside the transmission line, and reducing the accuracy of the warning result. Summary of the Invention

[0004] The present invention provides an icing galloping monitoring and warning device and method for transmission lines to solve the technical problem of low accuracy of warning results.

[0005] The icing galloping monitoring and warning method for transmission lines of the present invention adopts the following technical solutions: Including the following steps: Obtain the line external pressure sequence and the line vibration sequence of the transmission line in different periods; the line external pressure sequence includes several line pressure signals, and the line vibration sequence includes several line vibration signals; According to the line pressure signals in the line external pressure sequence, analyze the ice layer extrusion force on the line skin of the transmission line in different periods, and obtain the line outer skin icing hardness of the transmission line in different periods; according to the line outer skin icing hardness, screen out several high-efficiency icing periods from different periods; According to several line vibration signals in the line vibration sequence, analyze the irregular vibration conditions during galloping of the transmission line in different high-efficiency icing periods, filter out some frequency interference signals contained in the line vibration sequence, and obtain several low-frequency signals and several high-frequency signals of the transmission line in different high-efficiency icing periods; compare the content conditions between the high-frequency and low-frequency signals of the transmission line in different high-efficiency icing periods, and obtain the line low-frequency effective occupancy of the transmission line in different high-efficiency icing periods; according to the line outer skin icing hardness and the line low-frequency effective occupancy, comprehensively analyze the bearing capacity of the transmission line on the internal metal during galloping in different high-efficiency icing periods, and obtain the internal metal bearing loadability of the transmission line in different high-efficiency icing periods; Monitor and give early warning of ice galloping of transmission lines during different periods of efficient icing according to the internal metal pressure-bearing load capacity.

[0006] Preferably, the method for obtaining the hardness of the ice covering on the outer skin of the line is as follows: For the line external pressure sequence in any period, compare the pressure fluctuation directions between adjacent elements in the line external pressure sequence to obtain the ice layer covering pressure direction index of the line external pressure sequence in the period; If the ice layer covering pressure direction index of the transmission line in the -th period is less than 0, the calculation formula for the hardness of the ice covering on the outer skin of the transmission line in the -th period is: ; if the ice layer covering pressure direction index of the transmission line in the -th period is equal to 0, the calculation formula for the hardness of the ice covering on the outer skin of the transmission line in the -th period is: ; if the ice layer covering pressure direction index of the transmission line in the -th period is greater than 0, the calculation formula for the hardness of the ice covering on the outer skin of the transmission line in the -th period is: ; Wherein, represents the hardness of the ice covering on the outer skin of the transmission line in the -th period; represents the sum of all line pressure signals in the line external pressure sequence of the transmission line in the -th period; represents the ice layer covering pressure direction index of the transmission line in the -th period; represents the normalization function.

[0007] Preferably, the method for obtaining the ice layer covering pressure direction index is as follows: ; In the formula, represents the ice layer covering pressure direction index of the transmission line in the -th period; represents the number of all line pressure signals in the line external pressure sequence of the transmission line in the -th period; represents the -th line pressure signal in the line external pressure sequence of the transmission line in the -th period; represents the -th line pressure signal in the line external pressure sequence of the transmission line in the -th period; represents the sign function.

[0008] Preferably, the method for obtaining the high-efficiency icing period is as follows: Preset a hard threshold for the icing on the outer skin of the line, and take the period when the icing on the outer skin of the line is greater than the hard threshold for the icing on the outer skin of the line as the high-efficiency icing period.

[0009] Preferably, the method for obtaining the low-frequency signal and the high-frequency signal is as follows: In the line vibration sequence during the th high-efficiency icing period, every preset number of line vibration signals are divided into a local line vibration sequence; and the frequency signal with the maximum energy value in the th local line vibration sequence is used as the vibration energy representative signal of the th local line vibration sequence; according to the vibration energy representative signal, obtain the deviation degree of the vibration signal of each local line vibration sequence of the transmission line during the th high-efficiency icing period; according to the deviation degree of the vibration signal, filter and process the local line vibration sequence to obtain the signal sequence to be frequency-distinguished of the transmission line during the th high-efficiency icing period; during the th high-efficiency icing period of the transmission line, normalize each frequency signal in all the signal sequences to be frequency-distinguished, and use the normalized frequency signal as the frequency-normalized signal; preset a frequency-normalized signal boundary value , and use the frequency-normalized signal with a value less than as the low-frequency signal, and use the frequency-normalized signal greater than or equal to as the high-frequency signal.

[0010] Preferably, the method for obtaining the deviation degree of the vibration signal is as follows: Calculate the difference value of the overall vibration energy representative signal between the th local line vibration sequence and other local line vibration sequences of the transmission line during the th high-efficiency icing period, and use it as the deviation degree of the vibration signal of the th local line vibration sequence of the transmission line during the th high-efficiency icing period.

[0011] Preferably, the method for obtaining the signal sequence to be frequency-distinguished is as follows: Preset a deviation degree threshold of the vibration signal, and use the local line vibration sequence after filtering and deleting the local line vibration sequences with a deviation degree of the vibration signal greater than the deviation degree threshold of the vibration signal as the signal sequence to be frequency-distinguished of the transmission line during the th high-efficiency icing period.

[0012] Preferably, the method for obtaining the effective occupancy degree of the low-frequency of the line is as follows: ; In the formula, represents the line low-frequency effective occupancy of the transmission line during the th high-efficiency icing period; represents the mean value of the frequency data in all signal sequences to be frequency-distinguished of the transmission line during the th high-efficiency icing period; represents the number of low-frequency signals in all signal sequences to be frequency-distinguished of the transmission line during the th high-efficiency icing period; represents the number of high-frequency signals in all signal sequences to be frequency-distinguished of the transmission line during the th high-efficiency icing period.

[0013] Preferably, the method for obtaining the internal metal pressure-bearing loadability is as follows: ; In the formula, represents the internal metal pressure-bearing loadability of the transmission line during the th high-efficiency icing period; represents the line low-frequency effective occupancy of the transmission line during the th high-efficiency icing period; represents the line outer-covering icing hardness of the transmission line during the th high-efficiency icing period; represents a normalization function.

[0014] An icing galloping monitoring and warning device for a transmission line, the device includes: a line monitoring signal acquisition module, a line internal pressure-bearing analysis module, and an icing galloping monitoring and warning module; wherein the line monitoring signal acquisition module is used to acquire a plurality of line pressure signals and a plurality of line vibration signals of the transmission line in different periods, the line internal pressure-bearing analysis module realizes the steps of the icing galloping monitoring and warning method for the transmission line by calling a computer program, and obtains the internal metal pressure-bearing loadability of the transmission line in different high-efficiency icing periods, and the icing galloping monitoring and warning module monitors and warns the icing galloping of the transmission line in different high-efficiency icing periods.

[0015] The beneficial effects of the technical solution of the present invention are as follows: According to the line pressure signals in the line external pressure sequence, the present invention analyzes the ice squeezing force on the line skin of the transmission line in different periods, obtains the ice covering hardness of the line outer skin, and further screens out several efficient ice covering periods; wherein the ice covering hardness of the line outer skin is used to describe the firmness of the ice layer covering the line skin during the corresponding period; According to several line vibration signals in the line vibration sequence, the present invention analyzes the irregular vibration conditions during the dancing of the transmission line in different efficient ice covering periods. After filtering out some frequency interference signals contained in the line vibration sequence, the present invention compares the content of high-frequency and low-frequency signals of the transmission line in different efficient ice covering periods to obtain the effective low-frequency occupancy of the line; wherein the effective low-frequency occupancy of the line is used to describe the degree of the phenomenon that the ice layer covering the line skin of the transmission line may continuously dance and cause the transmission lines to collide during the corresponding efficient ice covering period; According to the ice covering hardness of the line outer skin and the effective low-frequency occupancy of the line, the present invention comprehensively analyzes the pressure-bearing capacity of the metal inside the transmission line during the dancing of the transmission line in different efficient ice covering periods to obtain the internal metal pressure-bearing loadability; and then conducts monitoring and early warning of ice-covered dancing; wherein the internal metal pressure-bearing loadability is used to describe the degree of accelerating the fatigue wear of the metal conduction components inside the transmission line during the corresponding efficient ice covering period; The present invention analyzes the pressure and vibration conditions received by the transmission line in different external weather environment periods, further analyzes the condensation process of the ice layer covering the line skin, largely eliminates electromagnetic interference, and improves the timeliness and accuracy of detection and early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flowchart of the steps of the ice-covered dancing monitoring and early warning method for transmission lines according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in conjunction with the drawings and preferred embodiments, describe in detail the specific embodiments, structures, features and effects of the ice-covered dancing monitoring and early warning device and method for transmission lines according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs.

[0020] The following specifically describes the specific solutions of the icing galloping monitoring and early warning device and method for transmission lines provided by the present invention in conjunction with the accompanying drawings.

[0021] Please refer to Figure 1 , which shows the flowchart of the steps of the icing galloping monitoring and early warning method for transmission lines provided by an embodiment of the present invention. The method includes the following steps: Step S001: Obtain the line external pressure sequence and the line vibration sequence of the transmission line in different periods; the line external pressure sequence includes several line pressure signals, and the line vibration sequence includes several line vibration signals.

[0022] It should be noted that when the prior art monitors the transmission line by installing sensors, it is easy to generate different thicknesses of icing stages due to extreme weather factors, causing different amplitudes of vibration between the transmission lines and generating different electromagnetic interferences, which interfere with the distinction of the loss conditions of the internal metal conductors of the transmission line.

[0023] In a specific implementation manner of the embodiment of the present invention, the method for obtaining the line external pressure sequence and the line vibration sequence is as follows: Obtain all line pressure signals and all line vibration signals within the past week from the electronic monitoring platform of the transmission line; preset a time interval , and take each as a period, and take the sequence composed of the pressure signals within each as the line external pressure sequence, and take the sequence composed of the line vibration signals within each as the line vibration sequence. There is a corresponding line external pressure sequence and a line vibration sequence within each period, and the number of elements contained in the line external pressure sequence and the line vibration sequence within the same period is the same.

[0024] It should be especially noted that in this embodiment, is taken as an example for description, and this embodiment is not specifically limited, and can be determined according to the specific implementation situation. In addition, the electronic monitoring platform in this embodiment defaults to a sampling frequency of 1 time / second as an example to record the line pressure signals and the line vibration signals, and the sampling frequency can be determined according to the specific implementation situation.

[0025] So far, the line external pressure sequence and the line vibration sequence of the transmission line in different periods are obtained through the above method.

[0026] Step S002: Analyze the ice squeezing force on the line skin of the transmission line in different periods based on the line pressure signals in the line external pressure sequence, and obtain the icing hardness of the line outer skin of the transmission line in different periods; screen out several efficient icing periods from different periods according to the icing hardness of the line outer skin.

[0027] It should be noted that the weather environment faced by the transmission line exposed to the external environment is complex and diverse. Different weather environments will have different effects on the ability of ice and snow to adhere to the line skin of the transmission line, which may be a promoting effect or a hindering effect; usually, the weather environment of heavy snowfall and strong cooling will provide better conditions for the phenomenon of ice and snow adhering to the line skin of the transmission line, while the weather environment of rapid temperature rise will provide poor conditions for the phenomenon of ice and snow adhering to the line skin of the transmission line. Therefore, there will be a large difference in the ice layer pressure on the line skin under their respective weather environments. So, the ice squeezing force on the line skin of the transmission line in different periods can be analyzed based on the line pressure signals in the line external pressure sequence, and the icing hardness of the line outer skin of the transmission line in different periods can be obtained; several efficient icing periods can be screened out from different periods according to the icing hardness of the line outer skin.

[0028] Specifically, as an example, the ice layer covering direction index can be calculated by the following formula: ; In the formula, represents the ice layer covering direction index of the transmission line in the th period; represents the number of all line pressure signals in the line external pressure sequence of the transmission line in the th period; represents the th line pressure signal in the line external pressure sequence of the transmission line in the th period; represents the th line pressure signal in the line external pressure sequence of the transmission line in the th period; represents the sign function.

[0029] It should be noted that if , it means that the transmission line is mainly affected by external weather such as strong cooling and heavy snowfall in the th period, resulting in the continuous accumulation of the ice and snow layer on the line skin of the transmission line in the th period; if , it means that the influencing factors of external weather such as strong cooling and strong temperature rise on the transmission line in the th period are basically balanced, resulting in the transmission line in the The more drastic and unstable the external environment changes experienced by the line skin are within a certain period; if , it indicates that the transmission line is mainly affected by external weather such as temperature rise during the th period, resulting in the continuous melting of the ice and snow layer covering the line skin of the transmission line during the th period.

[0030] Further, as an example, the ice hardness of the line outer skin can be calculated by the following formula: ; In the formula, represents the ice hardness of the line outer skin of the transmission line during the th period; represents the sum of all line pressure signals in the line external pressure sequence of the transmission line during the th period; represents the ice layer pressure direction index of the transmission line during the th period; represents the normalization function. Among them, is to perform normalization processing on for all periods, and is to perform normalization processing on for all periods.

[0031] It should be noted that the greater the ice hardness of the line outer skin, the thicker the ice and snow layer accumulated on the line skin of the transmission line during the corresponding period, indicating that the ice layer covering the line skin of the transmission line during the corresponding period is firmer and has higher hardness.

[0032] Further, a threshold value of the ice hardness of the line outer skin is preset, and the period when the ice hardness of the line outer skin is greater than is used as the efficient icing period; all efficient icing periods are obtained. Among them, this embodiment is described by taking as an example, and this embodiment is not specifically limited, where can be determined according to the specific implementation situation.

[0033] So far, several efficient icing periods are obtained through the above method.

[0034] Step S003: Analyze the irregular vibration conditions of the transmission line during galloping in different high-efficiency icing periods based on several line vibration signals in the line vibration sequence, filter out some frequency interference signals contained in the line vibration sequence, and obtain several low-frequency signals and several high-frequency signals of the transmission line in different high-efficiency icing periods; compare the content of the high-frequency and low-frequency signals of the transmission line in different high-efficiency icing periods to obtain the effective occupancy of the low-frequency line of the transmission line in different high-efficiency icing periods; comprehensively analyze the pressure-bearing capacity of the transmission line on the internal metal during galloping in different high-efficiency icing periods based on the hardness of the ice on the line outer skin and the effective occupancy of the low-frequency line, and obtain the internal metal pressure-bearing load of the transmission line in different high-efficiency icing periods.

[0035] It should be noted that the vibration signals of the transmission line are mainly divided into two types: high-frequency information vibration content and low-frequency information vibration content. Among them, the low-frequency information vibration content mainly refers to the ice on the line surface, which causes the cross-section of the transmission line to become asymmetric, and the lift generated under the action of wind will cause the transmission line to generate large-amplitude continuous low-frequency galloping content, which is more likely to cause damage accidents; the high-frequency information vibration content mainly refers to the vortex-induced resonance caused by the wind speed, which causes small-amplitude high-frequency vibration of the line surface wire and is prone to damage accidents; compared with the two, the low-frequency information vibration content is the signal that needs to be mainly analyzed. Therefore, the irregular vibration conditions of the transmission line during galloping in different high-efficiency icing periods can be analyzed, some frequency interference signals contained in the line vibration sequence can be filtered out, and several low-frequency signals and several high-frequency signals of the transmission line in different high-efficiency icing periods can be obtained; compare the content of the high-frequency and low-frequency signals of the transmission line in different high-efficiency icing periods to obtain the effective occupancy of the low-frequency line of the transmission line in different high-efficiency icing periods; comprehensively analyze the pressure-bearing capacity of the transmission line on the internal metal during galloping in different high-efficiency icing periods based on the hardness of the ice on the line outer skin and the effective occupancy of the low-frequency line, and obtain the internal metal pressure-bearing load of the transmission line in different high-efficiency icing periods.

[0036] Specifically, a signal quantity is preset , in the line vibration sequence of the th high-efficiency icing period, every line vibration signals are divided into a local line vibration sequence; obtain all local line vibration sequences; perform short-time Fourier transform on each local line vibration sequence to obtain several frequency signals of each local line vibration sequence. Each line vibration sequence contains multiple local line vibration sequences, each local line vibration sequence corresponds to multiple frequency signals, and each frequency signal corresponds to an energy value.

[0037] It should be especially noted that in this embodiment, is taken as an example for description, and this embodiment is not specifically limited, where It depends on the specific implementation; in addition, the process of obtaining the frequency signal is well-known in the short-time Fourier transform technology and will not be elaborated in this embodiment.

[0038] Further, the frequency signal with the largest energy value in the th local line vibration sequence is used as the vibration energy representative signal of the th local line vibration sequence. As an example, the vibration signal deviation can be calculated by the following formula: ; In the formula, represents the vibration signal deviation of the th local line vibration sequence during the th high-efficiency icing period of the transmission line; represents the vibration energy representative signal in the th local line vibration sequence during the th high-efficiency icing period of the transmission line; represents the mean value of the vibration energy representative signals of all other local line vibration sequences except the th local line vibration sequence during the th high-efficiency icing period of the transmission line; represents taking the absolute value.

[0039] It should be noted that the larger the vibration signal deviation, the more likely there is an interference signal in the corresponding local line vibration sequence, making the high and low frequency information boundaries of the transmission line more blurred during ice galloping, making the vibration signal deviate more from the true vibration content, indicating that the corresponding local line vibration sequence needs to be filtered and removed more.

[0040] Further, a vibration signal deviation threshold is preset, and the local line vibration sequences with a vibration signal deviation greater than are filtered and deleted, and the remaining local line vibration sequences are used as the signal sequence to be frequency differentiated during the th high-efficiency icing period of the transmission line. In this embodiment, is taken as an example for description, and this embodiment does not make specific limitations, where can be determined according to the specific implementation situation.

[0041] Further, during the th high-efficiency icing period of the transmission line, each frequency signal in all the signal sequences to be frequency differentiated is normalized, and the normalized frequency signal is used as the frequency-normalized signal; a frequency-normalized signal demarcation value is preset, and the frequency-normalized signals with values less than are used as low-frequency signals, and those greater than or equal to The frequency-normalized signal is used as the high-frequency signal. In this embodiment, is taken as an example for description. This embodiment does not make specific limitations. Among them, it can be determined according to the specific implementation situation.

[0042] It should be specifically noted that in this embodiment, by default, the function is taken as an example for normalization processing. Among them, the normalization function can be determined according to the specific implementation situation, and this embodiment will not elaborate.

[0043] Furthermore, as an example, the line low-frequency effective occupancy can be calculated by the following formula: ; In the formula, represents the line low-frequency effective occupancy of the transmission line during the th high-efficiency icing period; represents the mean value of the frequency data in all the signal sequences to be frequency-distinguished of the transmission line during the th high-efficiency icing period; represents the number of low-frequency signals in all the signal sequences to be frequency-distinguished of the transmission line during the th high-efficiency icing period; represents the number of high-frequency signals in all the signal sequences to be frequency-distinguished of the transmission line during the th high-efficiency icing period.

[0044] It should be noted that the larger the line low-frequency effective occupancy is, the more likely it is that the transmission line will have the phenomenon of continuous dancing of the ice layer covering the line skin during the corresponding high-efficiency icing period, resulting in the collision of transmission lines, reflecting that the reference significance of the low-frequency signal of the transmission line during the corresponding high-efficiency icing period is more effective.

[0045] Furthermore, as an example, the internal metal pressure-bearing loadability can be calculated by the following formula: ; In the formula, represents the internal metal pressure-bearing loadability of the transmission line during the th high-efficiency icing period; represents the line low-frequency effective occupancy of the transmission line during the th high-efficiency icing period; represents the line outer skin icing hardness of the transmission line during the th high-efficiency icing period; represents the normalization function, which normalizes the of the transmission line during all high-efficiency icing periods.

[0046] It should be noted that the greater the internal metal pressure-bearing load, the greater the pressure on the metal conduction components inside the transmission line during the corresponding high-efficiency icing period, indicating that the transmission line is more likely to accelerate the fatigue wear of the metal conduction components during the corresponding high-efficiency icing period, thus causing safety accidents.

[0047] Thus, the internal metal pressure-bearing load of the transmission line during different high-efficiency icing periods is obtained through the above method.

[0048] Step S004: Monitor and give early warnings of ice galloping of the transmission line during different high-efficiency icing periods according to the internal metal pressure-bearing load.

[0049] In a specific implementation manner of the embodiment of the present invention, four signal early warning level intervals are preset in sequence as 、 、 、 ; Taking any high-efficiency icing period as an example, if the internal metal pressure-bearing load of the transmission line during this high-efficiency icing period belongs to , then the early warning device does not perform early warning operations; if the internal metal pressure-bearing load of the transmission line during this high-efficiency icing period belongs to , then the early warning device makes an early warning mark on the electronic monitoring platform; if the internal metal pressure-bearing load of the transmission line during this high-efficiency icing period belongs to , then the early warning device makes an early warning mark on the electronic monitoring platform and gives a sound prompt; if the internal metal pressure-bearing load of the transmission line during this high-efficiency icing period belongs to , then after the early warning device makes an early warning mark and gives a sound prompt on the electronic monitoring platform, the operation of the transmission line is forcibly shut down.

[0050] It should be especially noted that this embodiment is described by taking as an example, and this embodiment is not specifically limited, and can be determined according to the specific implementation situation.

[0051] Thus, this embodiment is completed.

[0052] Another embodiment of the present invention provides an ice galloping monitoring and early warning device for a transmission line. The device includes a line monitoring signal acquisition module, a line internal pressure-bearing analysis module, and an ice galloping monitoring and early warning module; when the device calls a computer program, it executes the above method steps S001 to S004.

[0053] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A method for monitoring and early warning of ice dancing for power transmission lines, characterized in that: The method comprises the following steps: Acquire a line external pressure sequence and a line vibration sequence of a power transmission line in different periods; the line external pressure sequence includes a plurality of line pressure signals, and the line vibration sequence includes a plurality of line vibration signals; According to the line pressure signal in the line external pressure sequence, the ice compression force on the line skin of the transmission line in different periods is analyzed to obtain the ice hardness of the line skin of the transmission line in different periods; according to the ice hardness of the line skin, several efficient ice-covering periods are selected from different periods; According to several line vibration signals in the line vibration sequence, the irregular vibration of the transmission line when dancing in different high-efficiency icing periods is analyzed, and some frequency interference signals contained in the line vibration sequence are filtered to obtain several low-frequency signals and several high-frequency signals of the transmission line in different high-efficiency icing periods; the content between high-frequency and low-frequency signals of the transmission line in different high-efficiency icing periods is compared to obtain the line low-frequency effective occupancy of the transmission line in different high-efficiency icing periods; according to the hardness of the ice coating on the outer skin of the line and the effective occupancy of the low-frequency line, the pressure bearing capacity of the internal metal of the line when dancing in different high-efficiency icing periods is comprehensively analyzed to obtain the internal metal pressure bearing load of the transmission line in different high-efficiency icing periods; According to the internal metal pressure bearing capacity, ice dancing monitoring and early warning are carried out on the transmission lines during different high-efficiency icing periods.

2. The ice dancing monitoring and early warning method for power transmission lines according to claim 1 is characterized in that: The method for obtaining the ice hardness of the line outer skin is: For the line external pressure sequence in any period, the pressure fluctuation directions between adjacent elements in the line external pressure sequence are compared to obtain the ice layer pressure direction index of the line external pressure sequence in the period; If the transmission line is The ice cover pressure direction index in the period is less than 0, then the transmission line The calculation formula for the ice hardness of the line skin in a period is: ; If the transmission line is The ice cover pressure direction index in the period is equal to 0, then the transmission line The calculation formula for the ice hardness of the line skin in a period is: ; If the transmission line is The ice cover pressure direction index in the period is greater than 0, then the transmission line The calculation formula for the ice hardness of the line skin in a period is: ; in, Indicates that the transmission line is The hardness of ice coating on the line skin during a period; Indicates that the transmission line is The cumulative sum of all line pressure signals in the line external pressure sequence within a period; Indicates that the transmission line is Indicators of ice cover direction in a period; Represents the normalization function.

3. The ice dancing monitoring and early warning method for power transmission lines according to claim 2 is characterized in that: The method for obtaining the ice layer pressure direction index is as follows: ； In the formula, Indicates that the transmission line is Indicators of ice cover direction in a period; Indicates that the transmission line is The number of all line pressure signals in the line external pressure sequence within a period; Indicates that the transmission line is The first A line pressure signal; Indicates that the transmission line is The first A line pressure signal; Represents a symbolic function.

4. The ice dancing monitoring and early warning method for power transmission lines according to claim 1 is characterized in that: The method for obtaining the efficient ice-covering period is: A line skin icing hardness threshold is preset, and a period when the line skin icing hardness is greater than the line skin icing hardness threshold is used as an efficient icing period.

5. The ice dancing monitoring and early warning method for power transmission lines according to claim 1 is characterized in that: The method for obtaining the low-frequency signal and the high-frequency signal is: In the In the line vibration sequence within the efficient icing period, each preset number of line vibration signals is divided into a local line vibration sequence; and the The frequency signal with the largest energy value in the local line vibration sequence is taken as the The vibration energy representative signal of the local line vibration sequence is obtained according to the vibration energy representative signal. The vibration signal deviation of each local line vibration sequence in the high-efficiency icing period is calculated; according to the vibration signal deviation, the local line vibration sequence is filtered and processed to obtain the transmission line in the first The signal sequence to be distinguished by frequency in the efficient icing period; the transmission line in the During an efficient ice-covering period, each frequency signal in all the signal sequences to be frequency-differentiated is normalized, and the normalized frequency signal is used as a frequency normalization signal; Preset a frequency normalized signal cutoff value , the value is less than The frequency normalized signal is taken as the low-frequency signal and will be greater than or equal to The frequency normalized signal is taken as the high-frequency signal.

6. The ice dancing monitoring and early warning method for power transmission lines according to claim 5 is characterized in that: The method for obtaining the vibration signal deviation is: Calculate the transmission line During the efficient icing period The difference value of the overall vibration energy representative signal between the local line vibration sequence and other local line vibration sequences is used as the transmission line in the first During the efficient icing period The vibration signal deviation of a local line vibration sequence.

7. The ice dancing monitoring and early warning method for power transmission lines according to claim 5 is characterized in that: The method for acquiring the signal sequence to be frequency distinguished is: A vibration signal deviation threshold is preset, and the local line vibration sequence with a vibration signal deviation greater than the vibration signal deviation threshold is filtered out and deleted as the local line vibration sequence of the transmission line in the first The signal sequence to be distinguished by frequency during the period of efficient icing.

8. The ice dancing monitoring and early warning method for power transmission lines according to claim 5 is characterized in that: The method for obtaining the line low-frequency effective occupancy is: ； In the formula, Indicates that the transmission line is The line low-frequency effective occupancy during the high-efficiency icing period; Indicates that the transmission line is The mean value of the frequency data in all the signal sequences to be distinguished during the period of efficient icing; Indicates that the transmission line is The number of low-frequency signals in all the signal sequences to be distinguished during the efficient icing period; Indicates that the transmission line is The number of high-frequency signals in all signal sequences to be distinguished during an efficient icing period.

9. The ice dancing monitoring and early warning method for power transmission lines according to claim 1 is characterized in that: The method for obtaining the internal metal pressure bearing capacity is: ； In the formula, Indicates that the transmission line Internal metal pressure bearing capacity during an efficient icing period; Indicates that the transmission line The line low-frequency effective occupancy during the high-efficiency icing period; Indicates that the transmission line The ice hardness of the line skin during the efficient ice covering period; Represents the normalization function.

10. The ice dancing monitoring and early warning device for power transmission lines is characterized by: The device comprises: A line monitoring signal acquisition module, a line internal pressure analysis module and an ice dancing monitoring and early warning module; wherein the line monitoring signal acquisition module is used to obtain a number of line pressure signals and a number of line vibration signals of the transmission line in different periods, the line internal pressure analysis module implements the steps of the ice dancing monitoring and early warning method for transmission lines as described in any one of claims 1-9 by calling a computer program, and obtains the internal metal pressure load of the transmission line in different high-efficiency icing periods, and the ice dancing monitoring and early warning module monitors and warns of ice dancing on the transmission line in different high-efficiency icing periods.

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