CN117831250A - Transmission tower dynamic early warning method and system based on-line monitoring - Google Patents
Transmission tower dynamic early warning method and system based on-line monitoring Download PDFInfo
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Abstract
The invention discloses a transmission tower dynamic early warning method and system based on-line monitoring, wherein the method comprises the following steps: basic monitoring data and additional monitoring data of each ground wire are obtained; for a ground wire with line tension and line wind deflection angle in the additional monitoring data, calculating the icing thickness and the icing wind load correction coefficient; for the ground wire with only line tension or line wind deflection angle in the additional monitoring data, calculating an ice-free wind load correction coefficient; calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire according to the icing thickness, the icing wind load correction coefficient and the no-icing wind load correction coefficient, further calculating the vertical load, the horizontal load and the longitudinal load of each ground wire, and then carrying out dynamic early warning on a transmission tower; according to the method and the device, the load condition of the ground wire can be judged according to the data monitored in real time, so that dynamic early warning is provided, and the safety and reliability of power grid operation are improved.
Description
Technical Field
The invention relates to a transmission tower dynamic early warning method and system based on-line monitoring, and belongs to the technical field of transmission lines.
Background
The overhead transmission line has the characteristics of wide distribution region, large path environment difference and complex line corridor environment, and the transmission line and the tower are exposed in the natural environment for a long time and are easily damaged by the influence of the natural environment and external force. In recent years, with the increase of severe extreme weather, electric power infrastructure faces serious test, and complex environmental factors such as typhoons, surge line winds, extreme icing, line galloping and the like act on wires and towers, so that the damage such as wire breakage, tower overturning and the like can be inevitably generated on a power transmission line body structure, the whole power grid is paralyzed and large-scale power failure is caused, and great challenges are brought to safe operation and stable electric energy transmission of the power grid.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a transmission tower dynamic early warning method and system based on-line monitoring, which can solve the technical problems that a transmission line is easy to damage and difficult to monitor in a field natural environment.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a transmission tower dynamic early warning method based on-line monitoring, which comprises the following steps:
basic monitoring data and additional monitoring data of each ground wire are obtained; the basic monitoring data comprise line temperature, ambient wind speed and line outer diameter; at least one additional monitoring data of the ground wire simultaneously has line tension and line windage angle;
for the ground wire with the line tension and the line wind deflection angle in the additional monitoring data, calculating the icing thickness and the icing wind load correction coefficient according to the basic monitoring data and the additional monitoring data;
for the ground lead with only line tension or line wind deflection angle in the additional monitoring data, calculating an ice-free wind load correction coefficient according to the basic monitoring data and the additional monitoring data;
calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each conductive wire according to the icing thickness, the icing wind load correction coefficient and the ice-free wind load correction coefficient;
calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire;
and carrying out dynamic early warning on the power transmission towers according to the vertical load, the horizontal load and the longitudinal load of each ground wire.
Optionally, for the ground lead with the line tension and the line wind deflection angle in the additional monitoring data, calculating the icing thickness and the icing wind load correction coefficient according to the basic monitoring data and the additional monitoring data includes:
marking the ground lead with the line tension and the line wind deflection angle in the additional monitoring data as a ground lead A;
calculating the line unit length comprehensive load of the ground wire A by adopting a pre-constructed line mechanical state equation based on the line tension and the line temperature of the ground wire A;
and calculating the icing thickness and the icing wind load correction coefficient based on the ambient wind speed, the line outer diameter, the line wind deflection angle and the line unit length comprehensive load of the ground wire A.
Optionally, the line mechanical state equation is:
in T, T 0 The line tension of the working condition to be solved and the known working condition are respectively; p, p 0 The line unit length comprehensive load of the working condition to be solved and the known working condition is respectively; t, t 0 The line temperature is the line temperature of the working condition to be solved and the working condition known, l is the representative span of the strain section, a is the line temperature expansion coefficient, and E is the line elastic modulus.
Optionally, the calculating the icing thickness and the icing wind load correction factor includes:
constructing a relational expression of a vertical load of a line unit length and a horizontal wind load of the line unit length according to the ambient wind speed, the line outer diameter, the line wind deflection angle and the line unit length of the ground wire A:
solving the icing thickness delta and the icing wind load correction coefficient k of the ground wire A according to the relation between the vertical load and the horizontal wind load of the line 1 ：
Wherein d is the outside diameter of the line, v is the ambient wind speed, θ is the line windage angle, p g G is a gravity constant, p is a comprehensive load of the unit length of the line;
wherein if the icing thickness delta and the icing wind load correction coefficient k are the same 1 And if not, taking the average value as an output result.
Optionally, the calculating the correction coefficient of the ice-free wind load according to the basic monitoring data and the additional monitoring data comprises:
marking the ground lead with only line tension in the additional monitoring data as a ground lead B;
calculating the line unit length comprehensive load of the ground wire B by adopting a pre-constructed line mechanical state equation based on the line tension and the line temperature of the ground wire B;
building a relation of an ice-free load correction coefficient based on the ambient wind speed, the line outer diameter and the line unit length comprehensive load of the ground wire B:
solving ice-free wind load correction coefficient k of ground wire B 2 ：
Marking the ground lead with only the line windage angle in the additional monitoring data as a ground lead C;
and constructing a relation of the ice-free wind load correction coefficient based on the ambient wind speed, the line outer diameter and the line wind deflection angle of the ground wire C:
0.625k 2 v 2 d×10 -3 ＝p g tanθ
solving ice-free wind load correction coefficient k of ground lead C 2 ：
Wherein d is the outside diameter of the line, v is the ambient wind speed, θ is the line windage angle, p g The dead weight load of the unit length of the line is p, and the comprehensive load of the unit length of the line is p;
wherein if the ice-free wind load correction coefficient k is 2 And if not, taking the average value as an output result.
Optionally, calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each conductive wire according to the icing thickness, the icing wind load correction coefficient and the ice-free wind load correction coefficient:
wherein p is 1 、p 2 And p is the vertical load of the unit length of the line of the ground wire and the line listBit length horizontal wind load and line unit length comprehensive load, g is a gravity constant, d is the line outer diameter, p g The dead weight load of the unit length of the line is v is the ambient wind speed, delta is the icing thickness, and when delta=0, the value of k is the icing wind load correction coefficient, delta>And when 0, the value of k is the correction coefficient of the ice-free wind load.
Optionally, the calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire includes:
calculating the line tension of each conductive wire by adopting a pre-constructed line mechanical state equation according to the line unit length comprehensive load and the line temperature of each conductive wire;
calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line tension, the vertical load of the unit length of the line and the horizontal wind load of the unit length of the line of each ground wire:
in which Q V 、Q H 、Q T Respectively vertical load, horizontal load and longitudinal load of the ground wire, N is the split number of the ground wire, L V 、L H And the vertical span and the horizontal span are respectively, and T is the line tension of the ground wire.
The invention provides a transmission tower dynamic early warning system based on-line monitoring, which comprises an on-line monitoring device, a communication server, a network isolator, a tower dynamic simulation server and a monitoring terminal;
the on-line monitoring device is used for acquiring basic monitoring data and additional monitoring data of each ground wire; the basic monitoring data comprise line temperature, ambient wind speed and line outer diameter, and are sent to the communication server; wherein, the additional monitoring data of at least one of the ground wires simultaneously has line tension and line windage angle;
the communication server is used for receiving the basic monitoring data and the additional monitoring data of each ground wire sent by the online monitoring device and sending the basic monitoring data and the additional monitoring data to the network isolator;
the network isolator is used for receiving basic monitoring data and additional monitoring data of each ground wire sent by the communication server and sending the basic monitoring data and the additional monitoring data to the dynamic simulation server of the pole tower;
the dynamic simulation server of the pole tower is used for calculating the icing thickness and the icing wind load correction coefficient according to the basic monitoring data and the additional monitoring data of the ground wire with the line tension and the line wind deflection angle in the additional monitoring data; for the ground lead with only line tension or line wind deflection angle in the additional monitoring data, calculating an ice-free wind load correction coefficient according to the basic monitoring data and the additional monitoring data; calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each conductive wire according to the icing thickness, the icing wind load correction coefficient and the ice-free wind load correction coefficient; calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire; carrying out dynamic early warning on the power transmission towers according to the vertical load, the horizontal load and the longitudinal load of each ground wire;
the monitoring terminal is used for receiving and displaying the vertical load, the horizontal load, the longitudinal load and the dynamic early warning of each ground wire sent by the dynamic simulation server of the pole tower.
Optionally, the network isolator is further connected to a weather station, and is used for acquiring weather early warning information and sending the weather early warning information to the monitoring terminal and the dynamic simulation server of the tower.
Optionally, the network isolator is further connected with a control terminal, and is used for regulating and controlling the dynamic simulation server of the pole tower.
Compared with the prior art, the invention has the beneficial effects that:
according to the transmission tower dynamic early warning method and system based on-line monitoring, the basic monitoring data and the additional monitoring data of each ground wire are monitored in real time, so that the vertical load, the horizontal load and the longitudinal load of each ground wire are obtained through analysis, and then the transmission tower is subjected to dynamic early warning; the on-line monitoring device is simplified, and additional monitoring data of at least one ground wire can be simultaneously provided with line tension and line wind deflection angle, so that the related installation cost and operation and maintenance cost are reduced; meanwhile, the method can be combined with weather forecast issued by a weather station to perform advanced analysis and early warning; the safe and reliable operation of the power grid can be ensured.
Drawings
FIG. 1 is a flow chart of a transmission tower dynamic early warning method based on-line monitoring provided by an embodiment of the invention;
FIG. 2 is a flowchart of a correction coefficient operation process according to an embodiment of the present invention;
fig. 3 is a block diagram of a transmission tower dynamic early warning system based on-line monitoring according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
as shown in fig. 1, an embodiment of the present invention provides a transmission tower dynamic early warning method based on online monitoring, including:
step S1, basic monitoring data and additional monitoring data of each ground wire are obtained; the basic monitoring data comprise line temperature, ambient wind speed and line outer diameter; the additional monitoring data of at least one of the earth conductors simultaneously include line tension and line windage.
In order to reduce the installation cost and the operation and maintenance cost, in the present embodiment, at least the line tension monitoring device and the line windage angle monitoring device may be provided on only one ground wire.
Step S2, calculating the icing thickness and the icing wind load correction coefficient according to basic monitoring data and additional monitoring data of the ground wire with the line tension and the line wind deflection angle in the additional monitoring data; the specific process comprises the following steps:
s2.1, marking a ground lead with line tension and line windage angle existing in the additional monitoring data as a ground lead A;
s2.2, calculating the line unit length comprehensive load of the ground wire A by adopting a pre-constructed line mechanical state equation based on the line tension and the line temperature of the ground wire A; the line mechanical state equation is:
in T, T 0 The line tension of the working condition to be solved and the known working condition are respectively; p, p 0 The line unit length comprehensive load of the working condition to be solved and the known working condition is respectively; t, t 0 The line temperature is the line temperature of the working condition to be solved and the working condition known, l is the representative span of the strain section, a is the line temperature expansion coefficient, and E is the line elastic modulus;
s2.3, calculating an icing thickness and an icing wind load correction coefficient based on the ambient wind speed, the line outer diameter, the line wind deflection angle and the line unit length comprehensive load of the ground wire A; the specific process comprises the following steps:
step S2.3.1, constructing a relation between a vertical load of a line unit length and a horizontal wind load of the line unit length according to the ambient wind speed, the line outer diameter, the line wind deflection angle and the line unit length of the ground wire A:
s2.3.2 solving the icing thickness delta and the icing wind load correction coefficient k of the ground wire A according to the relation between the vertical load and the horizontal wind load of the line 1 ：
Wherein d is the outside diameter of the line, v is the ambient wind speed, θ is the line windage angle, p g G is a gravity constant, p is a comprehensive load of the unit length of the line;
wherein, if the icing thickness delta and the icing wind load correction coefficient k are 1 And if not, taking the average value as an output result.
Step S3, calculating an ice-free wind load correction coefficient according to basic monitoring data and additional monitoring data of the ground lead wire with only line tension or line wind deflection angle in the additional monitoring data; the specific process comprises the following steps:
s3.1, marking the ground wire with only line tension in the additional monitoring data as a ground wire B;
s3.2, calculating the line unit length comprehensive load of the ground wire B by adopting a pre-constructed line mechanical state equation based on the line tension and the line temperature of the ground wire B;
step S3.3, constructing a relation of an ice-free wind load correction coefficient based on the ambient wind speed, the line outer diameter and the line unit length comprehensive load of the ground wire B:
s3.4, solving an ice-free wind load correction coefficient k of the ground wire B 2 ：
S3.5, marking the ground lead with the line wind deflection angle only in the additional monitoring data as a ground lead C;
s3.6, constructing a relation of the ice-free wind load correction coefficient based on the ambient wind speed, the line outer diameter and the line wind deflection angle of the ground lead C:
0.625k 2 v 2 d×10 -3 ＝p g tanθ
step S3.7, solving the ice-free wind load correction coefficient k of the ground lead C 2 ：
Wherein d is the outside diameter of the line, v is the ambient wind speed, θ is the line windage angle, p g The dead weight load of the unit length of the line is p, and the comprehensive load of the unit length of the line is p;
wherein if there is no ice wind load correction coefficient k 2 And if not, taking the average value as an output result.
S4, calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire according to the icing thickness, the icing wind load correction coefficient and the ice-free wind load correction coefficient; the specific process is as follows:
wherein p is 1 、p 2 P is the vertical load of the line unit length of the ground wire, the horizontal wind load of the line unit length and the comprehensive load of the line unit length, g is the gravity constant, d is the external diameter of the line, and p g The dead weight load of the unit length of the line is v is the ambient wind speed, delta is the icing thickness, and when delta=0, the value of k is the icing wind load correction coefficient, delta>And when 0, the value of k is the correction coefficient of the ice-free wind load.
In order to reduce the installation cost and the operation and maintenance cost, the arrangement of the line tension monitoring device and the line wind deflection angle monitoring device is reduced, so that for the ground wire which cannot acquire line tension and/or line wind deflection angle, the vertical load of the line unit length, the horizontal wind load of the line unit length and the comprehensive load of the line unit length can be calculated through the method, and data support is provided for the subsequent steps.
S5, calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire; the specific process is as follows:
calculating the line tension of each ground wire by adopting a pre-constructed line mechanical state equation according to the line unit length comprehensive load and the line temperature of each ground wire;
calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line tension, the vertical load of the line unit length and the horizontal wind load of the line unit length of each ground wire:
in which Q V 、Q H 、Q T Respectively vertical load, horizontal load and longitudinal load of the ground wire, N is the split number of the ground wire, L V 、L H And the vertical span and the horizontal span are respectively, and T is the line tension of the ground wire.
S6, carrying out dynamic early warning on the transmission tower according to the vertical load, the horizontal load and the longitudinal load of each conductive wire;
in particular, in this embodiment, the dynamic early warning may compare the vertical load, the horizontal load, and the longitudinal load of each conductive wire with a preset threshold, and if any one of them is greater than the corresponding preset threshold, early warning is performed on the transmission tower corresponding to the conductive wire; in other optional embodiments, the stress condition of the corresponding transmission tower can be further analyzed by taking the vertical load, the horizontal load and the longitudinal load of each ground wire as basic data, so that early warning is performed.
In the steps S2-S3, it is necessary to perform calculation on the ground wire in which the line tension and the line wind deflection angle exist in the additional monitoring data and the ground wire in which only the line tension or the line wind deflection angle exists in the additional monitoring data, respectively, and for convenience of calculation, the calculation can be simplified by the following judgment statement, as shown in fig. 2:
step (1), numbering and sorting all the ground wires, and initializing n=1;
judging whether line tension exists in the additional monitoring data of the conducting wire with the number n or not, if so, calculating the comprehensive load of the line unit length according to a line mechanical state equation, and entering the step (3); if not, entering the step (4);
step (3), judging whether a line wind deflection angle exists in additional monitoring data of the conducting wire with the number n, if so, calculating the icing thickness and the icing wind load correction coefficient of the conducting wire; if not, calculating an ice-free load correction coefficient of the ground wire;
step (4), judging whether a line wind deflection angle exists in the additional monitoring data of the conducting wire with the number n, if so, calculating an ice-free wind load correction coefficient of the conducting wire; if not, let n=n+1 and return to step (2).
Embodiment two:
as shown in FIG. 3, the invention provides a transmission tower dynamic early warning system based on-line monitoring, which comprises an on-line monitoring device, a communication server, a network isolator, a tower dynamic simulation server and a monitoring terminal.
The on-line monitoring device is used for acquiring basic monitoring data and additional monitoring data of each ground wire; the basic monitoring data comprise line temperature, ambient wind speed and line outer diameter, and are sent to the communication server; the line temperature can be monitored by a line temperature monitoring device, the ambient wind speed can be monitored by a microclimate monitoring device, and the line outer diameter can be directly inquired and obtained according to engineering files; the additional monitoring data mainly comprise line tension and line windage yaw, and in addition, the gradient of the tower, the stress of the tower and the like can be increased as required for related early warning; in this embodiment, in order to calibrate the related data, the additional monitoring data of at least one ground lead has both line tension and line windage angle; that is, only a group of line tension monitoring devices and line windage yaw monitoring devices are required to be arranged, so that the installation cost and the operation and maintenance cost of the monitoring devices are greatly reduced.
The communication server is used for receiving the basic monitoring data and the additional monitoring data of each ground wire sent by the on-line monitoring device and sending the basic monitoring data and the additional monitoring data to the network isolator; the communication can be generally performed in the forms of 4G/5G, power private network and short message.
And the network isolator is used for receiving the basic monitoring data and the additional monitoring data of each ground wire sent by the communication server and sending the basic monitoring data and the additional monitoring data to the dynamic simulation server of the pole tower.
The dynamic simulation server of the tower is used for calculating the icing thickness and the icing wind load correction coefficient according to the basic monitoring data and the additional monitoring data of the ground wire with the line tension and the line wind deflection angle in the additional monitoring data; for the ground wire with only line tension or line wind deflection angle in the additional monitoring data, calculating an ice-free wind load correction coefficient according to the basic monitoring data and the additional monitoring data; calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire according to the icing thickness, the icing wind load correction coefficient and the ice-free wind load correction coefficient; calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire; and carrying out dynamic early warning on the transmission tower according to the vertical load, the horizontal load and the longitudinal load of each conductive wire.
The monitoring terminal is used for receiving the vertical load, the horizontal load, the longitudinal load and the dynamic early warning of each ground wire sent by the dynamic simulation server of the pole tower and displaying the vertical load, the horizontal load, the longitudinal load and the dynamic early warning; the monitoring terminal can also monitor by adopting a VPN mobile terminal mode.
The network isolator can also be connected to a weather station through the Internet and used for acquiring weather early warning information and sending the weather early warning information to the monitoring terminal and the dynamic simulation server of the pole tower, the monitoring terminal can directly acquire future weather conditions, and the dynamic simulation server of the pole tower can add the future weather conditions into corresponding judgment, such as the influence of future environmental wind speed on load, so that early warning is carried out in advance.
The network isolator is also connected with a control terminal for regulating and controlling the dynamic simulation server of the pole tower.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A transmission tower dynamic early warning method based on-line monitoring is characterized by comprising the following steps:
basic monitoring data and additional monitoring data of each ground wire are obtained; the basic monitoring data comprise line temperature, ambient wind speed and line outer diameter; at least one additional monitoring data of the ground wire simultaneously has line tension and line windage angle;
for the ground wire with the line tension and the line wind deflection angle in the additional monitoring data, calculating the icing thickness and the icing wind load correction coefficient according to the basic monitoring data and the additional monitoring data;
for the ground lead with only line tension or line wind deflection angle in the additional monitoring data, calculating an ice-free wind load correction coefficient according to the basic monitoring data and the additional monitoring data;
calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each conductive wire according to the icing thickness, the icing wind load correction coefficient and the ice-free wind load correction coefficient;
calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire;
and carrying out dynamic early warning on the power transmission towers according to the vertical load, the horizontal load and the longitudinal load of each ground wire.
2. The transmission tower dynamic early warning method based on-line monitoring according to claim 1, wherein the calculating the icing thickness and the icing wind load correction coefficient according to the basic monitoring data and the additional monitoring data for the ground wire with the line tension and the line wind deflection angle in the additional monitoring data comprises:
marking the ground lead with the line tension and the line wind deflection angle in the additional monitoring data as a ground lead A;
calculating the line unit length comprehensive load of the ground wire A by adopting a pre-constructed line mechanical state equation based on the line tension and the line temperature of the ground wire A;
and calculating the icing thickness and the icing wind load correction coefficient based on the ambient wind speed, the line outer diameter, the line wind deflection angle and the line unit length comprehensive load of the ground wire A.
3. The transmission tower dynamic early warning method based on-line monitoring according to claim 2, wherein the line mechanical state equation is:
in T, T 0 The line tension of the working condition to be solved and the known working condition are respectively; p, p 0 The line unit length comprehensive load of the working condition to be solved and the known working condition is respectively; t, t 0 The line temperature is the line temperature of the working condition to be solved and the working condition known, l is the representative span of the strain section, a is the line temperature expansion coefficient, and E is the line elastic modulus.
4. The transmission tower dynamic early warning method based on-line monitoring according to claim 2, wherein the calculating of the icing thickness and the icing wind load correction factor comprises:
constructing a relational expression of a vertical load of a line unit length and a horizontal wind load of the line unit length according to the ambient wind speed, the line outer diameter, the line wind deflection angle and the line unit length of the ground wire A:
solving the icing thickness delta and the icing wind load correction coefficient k of the ground wire A according to the relation between the vertical load and the horizontal wind load of the line 1 ：
Wherein d is the outside diameter of the line, v is the ambient wind speed, θ is the line windage angle, p g G is a gravity constant, p is a comprehensive load of the unit length of the line;
wherein if the icing thickness delta and the icing wind load correction coefficient k are the same 1 And if not, taking the average value as an output result.
5. The transmission tower dynamic early warning method based on-line monitoring according to claim 1, wherein the calculating the ice-free wind load correction coefficient according to the basic monitoring data and the additional monitoring data thereof comprises:
marking the ground lead with only line tension in the additional monitoring data as a ground lead B;
calculating the line unit length comprehensive load of the ground wire B by adopting a pre-constructed line mechanical state equation based on the line tension and the line temperature of the ground wire B;
building a relation of an ice-free load correction coefficient based on the ambient wind speed, the line outer diameter and the line unit length comprehensive load of the ground wire B:
solving ice-free wind load correction coefficient k of ground wire B 2 ：
Marking the ground lead with only the line windage angle in the additional monitoring data as a ground lead C;
and constructing a relation of the ice-free wind load correction coefficient based on the ambient wind speed, the line outer diameter and the line wind deflection angle of the ground wire C:
0.625k 2 v 2 d×10 -3 ＝p g tanθ
solving ice-free wind load correction coefficient k of ground lead C 2 ：
Wherein d is the outside diameter of the line, v is the ambient wind speed, θ is the line windage angle, p g The dead weight load of the unit length of the line is p, and the comprehensive load of the unit length of the line is p;
wherein if the ice-free wind load correction coefficient k is 2 And if not, taking the average value as an output result.
6. The transmission tower dynamic early warning method based on-line monitoring according to claim 1, wherein the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each conductive wire are calculated according to the icing thickness, the icing wind load correction coefficient and the no-icing wind load correction coefficient:
wherein p is 1 、p 2 P is the vertical load of the line unit length of the ground wire, the horizontal wind load of the line unit length and the comprehensive load of the line unit length, g is the gravity constant, d is the external diameter of the line, and p g The dead weight load of the unit length of the line is v is the ambient wind speed, delta is the icing thickness, and when delta=0, the value of k is the icing wind load correction coefficient, delta>And when 0, the value of k is the correction coefficient of the ice-free wind load.
7. The method for dynamically pre-warning a transmission tower based on-line monitoring according to claim 1, wherein the calculating the vertical load, the horizontal load and the longitudinal load of each of the conductive wires according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each of the conductive wires comprises:
calculating the line tension of each conductive wire by adopting a pre-constructed line mechanical state equation according to the line unit length comprehensive load and the line temperature of each conductive wire;
calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line tension, the vertical load of the unit length of the line and the horizontal wind load of the unit length of the line of each ground wire:
in which Q V 、Q H 、Q T Respectively vertical load, horizontal load and longitudinal load of the ground wire, N is the split number of the ground wire, L V 、L H And the vertical span and the horizontal span are respectively, and T is the line tension of the ground wire.
8. A transmission tower dynamic early warning system based on-line monitoring comprises an on-line monitoring device, a communication server, a network isolator, a tower dynamic simulation server and a monitoring terminal;
the on-line monitoring device is used for acquiring basic monitoring data and additional monitoring data of each ground wire; the basic monitoring data comprise line temperature, ambient wind speed and line outer diameter, and are sent to the communication server; wherein, the additional monitoring data of at least one of the ground wires simultaneously has line tension and line windage angle;
the communication server is used for receiving the basic monitoring data and the additional monitoring data of each ground wire sent by the online monitoring device and sending the basic monitoring data and the additional monitoring data to the network isolator;
the network isolator is used for receiving basic monitoring data and additional monitoring data of each ground wire sent by the communication server and sending the basic monitoring data and the additional monitoring data to the dynamic simulation server of the pole tower;
the dynamic simulation server of the pole tower is used for calculating the icing thickness and the icing wind load correction coefficient according to the basic monitoring data and the additional monitoring data of the ground wire with the line tension and the line wind deflection angle in the additional monitoring data; for the ground lead with only line tension or line wind deflection angle in the additional monitoring data, calculating an ice-free wind load correction coefficient according to the basic monitoring data and the additional monitoring data; calculating the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each conductive wire according to the icing thickness, the icing wind load correction coefficient and the ice-free wind load correction coefficient; calculating the vertical load, the horizontal load and the longitudinal load of each ground wire according to the line unit length vertical load, the line unit length horizontal wind load and the line unit length comprehensive load of each ground wire; carrying out dynamic early warning on the power transmission towers according to the vertical load, the horizontal load and the longitudinal load of each ground wire;
the monitoring terminal is used for receiving and displaying the vertical load, the horizontal load, the longitudinal load and the dynamic early warning of each ground wire sent by the dynamic simulation server of the pole tower.
9. The transmission tower dynamic early warning system based on-line monitoring according to claim 8, wherein the network isolator is further connected to a weather station for acquiring weather early warning information and transmitting to the monitoring terminal and the tower dynamic simulation server.
10. The transmission tower dynamic early warning system based on-line monitoring according to claim 8, wherein the network isolator is further connected with a control terminal for regulating and controlling the tower dynamic simulation server.
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