阅读说明：本技术 一种用于输电线路防外破的故障预警方法及装置 (Fault early warning method and device for preventing transmission line from being broken outside ) 是由 俞啸玲 邢海青 姚海燕 张宓璐 丁力 卢科帆 叶凌霄 陈琴芳 于 2021-07-30 设计创作，主要内容包括：本发明提出了一种用于输电线路防外破的故障预警方法及装置,包括：基于预设采样频率获取施工车辆的位置数据和速度数据并进行预处理；根据预处理后的速度数据确定测试信号的发送频率,以所述发送频率发送测试信号；当接收到防外破监控平台对测试信号的反馈时,将位置数据和速度数据发送到防外破监控平台,否则生成第一预警信号；根据预处理后的位置数据,结合输电线路施工数据,计算施工车辆与输电线路的直线距离；当直线距离小于臂杆长度时向施工车辆发送防外破预警信号。本发明考虑到了无线通信设备对监控效果的影响,并有效的结合了施工车辆的速度情况,针对不同移动速度的施工车辆进行不同频率的测试,以确保通信正常。(The invention provides a fault early warning method and a fault early warning device for preventing external damage of a power transmission line, wherein the fault early warning method comprises the following steps: acquiring position data and speed data of a construction vehicle based on a preset sampling frequency and preprocessing the position data and the speed data; determining the sending frequency of the test signal according to the preprocessed speed data, and sending the test signal at the sending frequency; when receiving the feedback of the anti-external-damage monitoring platform to the test signal, sending the position data and the speed data to the anti-external-damage monitoring platform, otherwise, generating a first early warning signal; calculating the linear distance between the construction vehicle and the power transmission line according to the preprocessed position data and by combining the power transmission line construction data; and when the linear distance is less than the length of the arm lever, sending an external damage prevention early warning signal to the construction vehicle. The invention considers the influence of wireless communication equipment on the monitoring effect, effectively combines the speed condition of the construction vehicle, and tests different frequencies aiming at the construction vehicles with different moving speeds so as to ensure normal communication.)

1. A fault early warning method for preventing external damage of a power transmission line is characterized by comprising the following steps:

acquiring position data and speed data of a construction vehicle based on a preset sampling frequency through a vehicle-mounted GPS terminal and preprocessing the position data and the speed data;

determining the sending frequency of the test signal according to the preprocessed speed data, and sending the test signal to the anti-external-damage monitoring platform through the vehicle-mounted GPS terminal at the sending frequency;

when the vehicle-mounted GPS terminal receives the feedback of the anti-external-damage monitoring platform to the test signal, the position data and the speed data are sent to the anti-external-damage monitoring platform, and otherwise, a first early warning signal is generated;

calculating the linear distance between the construction vehicle and the power transmission line by combining the pre-stored power transmission line construction data according to the preprocessed position data through the external damage prevention monitoring platform;

and comparing the linear distance with the length of the arm lever of the construction vehicle, and sending an external damage prevention early warning signal to the construction vehicle when the linear distance is smaller than the length of the arm lever.

2. The fault early warning method for preventing the external damage of the power transmission line according to claim 1, wherein the position data and the speed data of the construction vehicle are obtained through the vehicle-mounted GPS terminal based on a preset sampling frequency and are preprocessed, and the method comprises the following steps:

calculating difference values of position data and speed data obtained by two adjacent sampling points respectively, and taking data corresponding to the two adjacent sampling points as outlier data when the difference values are larger than a preset threshold value;

when the position data and the speed data corresponding to the same sampling point are outliers, adjusting the outliers based on a moving average filtering method;

when only the corresponding position data of the same sampling point is the outlier data, adjusting the outlier data based on the ratio of the speed data corresponding to the sampling point to the preset sampling frequency;

and when only the corresponding speed data of the same sampling point is the outlier data, adjusting the outlier data based on the product of the corresponding position data and the predicted sampling frequency at two adjacent sides of the sampling point.

3. The method for early warning of the failure of the transmission line for preventing the outdamage according to claim 1, wherein the sending frequency of the test signal is determined according to the preprocessed speed data, and the test signal is sent to the outdamage prevention monitoring platform through the vehicle-mounted GPS terminal at the sending frequency, and the method comprises the following steps:

determining initial sending frequency, and determining acceleration data of the construction vehicle according to the change rate of the speed data;

judging the directions of the acceleration and the speed of the construction vehicle according to the acceleration data and the speed data;

if the acceleration and the speed of the construction vehicle are in the same direction, and the acceleration is increased, the sending frequency is increased;

if the acceleration and the speed of the construction vehicle are opposite, and the acceleration is increased, reducing the sending frequency;

and the vehicle-mounted GPS terminal generates a pulse signal with the adjusted sending frequency and sends the pulse signal to the external damage prevention monitoring platform.

4. The fault early warning method for preventing the external damage of the power transmission line according to claim 1, wherein the construction data of the power transmission line comprises coordinates of towers in a protection area of the power transmission line and a horizontal distance D between a side phase conductor and the center of the power transmission line₁And the shortest distance H between the side phase conductor pair and the ground₁；

D₁、H₁The value ranges of (A) are all positive numbers.

5. The fault early warning method for preventing the external damage to the transmission line according to claim 4, wherein the step of calculating the linear distance between the construction vehicle and the transmission line by the external damage prevention monitoring platform according to the preprocessed position data and the pre-stored transmission line construction data comprises the following steps:

according to the position data, a first coordinate of a starting point tower pole and a second coordinate of a terminal point tower pole in the power transmission line protection area are obtained according to the position data, and a central connection line equation f of the starting point tower pole and the terminal point tower pole is determined according to the first coordinate and the second coordinate₁(x)；

According to the real-time coordinates (LonA, LatA) of the construction vehicle, LonA is the longitude of the real-time coordinates, LatA is the latitude of the real-time coordinates, an equation f which passes through the real-time coordinates and is connected with the center is determined₁(x) Vertical linear equation f₂(x)；

Determination of f₁(x) And f₂(x) Coordinates (LonB, LatB) of the intersection point J, wherein LonB is the longitude of the intersection point J, LatB is the latitude of the intersection point J, and the horizontal distance D of the construction vehicle to the center of the power transmission line is calculated based on a formula I and a formula II;

c ═ sin (lata) × sin (latb) + cos (lata) × cos (LonA-LonB) formula one;

d ═ R × arccos (c) x (pi/180) formula two;

wherein C is an intermediate variable, R is the radius of the earth, the value ranges of C, LatA, LatB, LonA and LonB are real numbers, and the value range of D, R is a positive number;

according to the horizontal distance D of the construction vehicle to the center of the power transmission line and the horizontal distance D of the side phase lead to the center of the power transmission line₁Calculating the horizontal distance HD of the opposite side phase conductor of the construction vehicle, wherein the value range of the HD is positive;

according to the Pythagorean theorem, consisting of HD and H₁And calculating the linear distance between the construction vehicle and the side phase conductor of the power transmission line.

6. The fault early warning method for preventing the outreach of the power transmission line according to claim 1, wherein the step of comparing the linear distance with the length of an arm of the construction vehicle and sending an outreach-preventing early warning signal to the construction vehicle when the linear distance is less than the length of the arm comprises the following steps:

comparing the linear distance with the length of an arm lever of the construction vehicle;

if the length of the arm lever is less than the length of the arm lever, sending a second early warning signal to the construction vehicle;

after the second early warning signal is sent out, if the linear distance is still smaller than the length of the arm lever after the preset time, the third early warning signal is sent to operation and maintenance personnel in the power transmission line protection area.

7. The utility model provides a trouble early warning device for transmission line prevents outer broken, its characterized in that, trouble early warning device includes:

an acquisition unit: the vehicle-mounted GPS terminal is used for acquiring position data and speed data of a construction vehicle based on a preset sampling frequency and preprocessing the position data and the speed data;

a test unit: the vehicle-mounted GPS terminal is used for sending the test signal to the anti-external-damage monitoring platform at the sending frequency;

the communication early warning unit: the vehicle-mounted GPS terminal is used for sending the position data and the speed data to the anti-external-damage monitoring platform when receiving the feedback of the anti-external-damage monitoring platform to the test signal, otherwise, generating a first early warning signal;

a calculation unit: the system comprises a monitoring platform for preventing external damage, a data processing module and a data processing module, wherein the monitoring platform is used for calculating the linear distance between a construction vehicle and a power transmission line according to the preprocessed position data and speed data and by combining with pre-stored power transmission line construction data;

prevent outer broken early warning unit: and the early warning device is used for comparing the linear distance with the length of the arm lever of the construction vehicle and sending an external damage prevention early warning signal to the construction vehicle when the linear distance is smaller than the length of the arm lever.

8. The fault early warning device for preventing the external damage of the power transmission line according to claim 7, wherein the obtaining unit is specifically configured to:

calculating difference values of position data and speed data obtained by two adjacent sampling points respectively, and taking data corresponding to the two adjacent sampling points as outlier data when the difference values are larger than a preset threshold value;

when the position data and the speed data corresponding to the same sampling point are outliers, adjusting the outliers based on a moving average filtering method;

when only the corresponding position data of the same sampling point is the outlier data, adjusting the outlier data based on the ratio of the speed data corresponding to the sampling point to the preset sampling frequency;

and when only the corresponding speed data of the same sampling point is the outlier data, adjusting the outlier data based on the product of the corresponding position data and the predicted sampling frequency at two adjacent sides of the sampling point.

9. The fault early warning device for preventing the external damage of the power transmission line according to claim 7, wherein the testing unit is specifically configured to:

determining initial sending frequency, and determining acceleration data of the construction vehicle according to the change rate of the speed data;

judging the directions of the acceleration and the speed of the construction vehicle according to the acceleration data and the speed data;

if the acceleration and the speed of the construction vehicle are in the same direction, and the acceleration is increased, the sending frequency is increased;

if the acceleration and the speed of the construction vehicle are opposite, and the acceleration is increased, reducing the sending frequency;

and the vehicle-mounted GPS terminal generates a pulse signal with the adjusted sending frequency and sends the pulse signal to the external damage prevention monitoring platform.

10. The fault early warning device for preventing the external damage of the power transmission line according to claim 7, wherein the external damage prevention early warning unit is specifically configured to:

comparing the linear distance with the length of an arm lever of the construction vehicle;

if the length of the arm lever is less than the length of the arm lever, sending a second early warning signal to the construction vehicle;

after the second early warning signal is sent out, if the linear distance is still smaller than the length of the arm lever after the preset time, the third early warning signal is sent to operation and maintenance personnel in the power transmission line protection area.

Technical Field

The invention belongs to the field of power transmission fault monitoring, and particularly relates to a fault early warning method and device for preventing external damage of a power transmission line.

Background

In the process of carrying out construction operation on the power transmission line, a construction vehicle easily touches the tower, the overhead line, the underground cable and other facilities of the nearby power transmission line, so that the power transmission line is damaged, and potential safety hazards are caused. The external damage prevention of the power transmission line refers to the fact that the power transmission line is prevented from being damaged by external force through monitoring in the modes of image recognition, GPS positioning and the like. With the continuous development of urban scale, the characteristics of long running route and wide distribution range of the power transmission line cause great difficulty in external damage prevention monitoring of the power transmission line. The problem that the monitoring for preventing external damage by using the image recognition technology is easily influenced by weather and difficult to realize all-weather monitoring

In order to solve the above problems, a GPS positioning technology is generally used to acquire the position information of a construction vehicle through a real-time positioning module, and the position information is transmitted to an external damage prevention monitoring platform through wireless communication. However, the reliability of wireless communication has defects, for example, a random fault occurs in a device for wireless communication, so that related data of a construction vehicle cannot be uploaded to the external damage prevention monitoring platform in time, the risk that the power transmission line is damaged by the construction vehicle can be greatly increased, and the normal operation of a power grid system is influenced.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a fault early warning method for preventing an external damage of a power transmission line, which comprises the following steps:

acquiring position data and speed data of a construction vehicle based on a preset sampling frequency through a vehicle-mounted GPS terminal and preprocessing the position data and the speed data;

determining the sending frequency of the test signal according to the preprocessed speed data, and sending the test signal to the anti-external-damage monitoring platform through the vehicle-mounted GPS terminal at the sending frequency;

when the vehicle-mounted GPS terminal receives the feedback of the anti-external-damage monitoring platform to the test signal, the position data and the speed data are sent to the anti-external-damage monitoring platform, and otherwise, a first early warning signal is generated;

calculating the linear distance between a construction vehicle and the power transmission line by combining pre-stored power transmission line construction data according to the preprocessed position data and speed data through the external damage prevention monitoring platform;

and comparing the linear distance with the length of the arm lever of the construction vehicle, and sending an external damage prevention early warning signal to the construction vehicle when the linear distance is smaller than the length of the arm lever.

Optionally, the method for acquiring the position data and the speed data of the construction vehicle and preprocessing the position data and the speed data of the construction vehicle by the vehicle-mounted GPS terminal based on the preset sampling frequency includes:

calculating difference values of position data and speed data obtained by two adjacent sampling points respectively, and taking data corresponding to the two adjacent sampling points as outlier data when the difference values are larger than a preset threshold value;

when the position data and the speed data corresponding to the same sampling point are outliers, adjusting the outliers based on a moving average filtering method;

when only the corresponding position data of the same sampling point is the outlier data, adjusting the outlier data based on the ratio of the speed data corresponding to the sampling point to the preset sampling frequency;

and when only the corresponding speed data of the same sampling point is the outlier data, adjusting the outlier data based on the product of the corresponding position data and the predicted sampling frequency at two adjacent sides of the sampling point.

Optionally, the determining, according to the preprocessed speed data, a sending frequency of the test signal, and sending the test signal to the external damage prevention monitoring platform through the vehicle-mounted GPS terminal at the sending frequency includes:

determining initial sending frequency, and determining acceleration data of the construction vehicle according to the change rate of the speed data;

judging the directions of the acceleration and the speed of the construction vehicle according to the acceleration data and the speed data;

if the acceleration and the speed of the construction vehicle are in the same direction, and the acceleration is increased, the sending frequency is increased;

if the acceleration and the speed of the construction vehicle are opposite, and the acceleration is increased, reducing the sending frequency;

and the vehicle-mounted GPS terminal generates a pulse signal with the adjusted sending frequency and sends the pulse signal to the external damage prevention monitoring platform.

Optionally, the power transmission line construction data includes coordinates of a tower in the power transmission line protection area and a horizontal distance D between a side phase conductor and the center of the power transmission line₁And the shortest distance H between the side phase conductor pair and the ground₁；

D₁、H₁The value ranges of (A) are all positive numbers.

Optionally, the step of calculating the linear distance between the construction vehicle and the power transmission line based on the position data and the pre-stored power transmission line construction data by the external damage prevention monitoring platform includes:

obtaining a first coordinate of a starting point tower pole and a second coordinate of a terminal point tower pole in the power transmission line protection area according to the position data, and determining a central connection line equation f of the starting point tower pole and the terminal point tower according to the first coordinate and the second coordinate₁(x)；

According to the real-time coordinates (LonA, LatA) of the construction vehicle, LonA is the longitude of the real-time coordinates, LatA is the latitude of the real-time coordinates, an equation f which passes through the real-time coordinates and is connected with the center is determined₁(x) Vertical linear equation f₂(x)；

Determination of f₁(x) And f₂(x) Coordinates (LonB, LatB) of the intersection point J, wherein LonB is the longitude of the intersection point J, LatB is the latitude of the intersection point J, and the horizontal distance D of the construction vehicle to the center of the power transmission line is calculated based on a formula I and a formula II;

c ═ sin (lata) × sin (latb) + cos (lata) × cos (LonA-LonB) formula one;

d ═ R × arccos (c) x (pi/180) formula two;

wherein C is an intermediate variable, R is the radius of the earth, the value ranges of C, LatA, LatB, LonA and LonB are real numbers, and the value range of D, R is a positive number;

according to the horizontal distance D of the construction vehicle to the center of the power transmission line and the horizontal distance D of the side phase lead to the center of the power transmission line₁Calculating the horizontal distance HD of the opposite side phase conductor of the construction vehicle, wherein the value range of the HD is positive;

according to the Pythagorean theorem, consisting of HD and H₁And calculating the linear distance between the construction vehicle and the side phase conductor of the power transmission line.

Optionally, compare linear distance and construction vehicle's armed lever length, send to construction vehicle when linear distance is less than armed lever length and prevent outer broken early warning signal, include:

comparing the linear distance with the length of an arm lever of the construction vehicle;

if the length of the arm lever is less than the length of the arm lever, sending a second early warning signal to the construction vehicle;

after the second early warning signal is sent out, if the linear distance is still smaller than the length of the arm lever after the preset time, the third early warning signal is sent to operation and maintenance personnel in the power transmission line protection area.

The invention also provides a fault early warning device for preventing the external damage of the power transmission line based on the same idea, which comprises the following components:

an acquisition unit: the vehicle-mounted GPS terminal is used for acquiring position data and speed data of a construction vehicle based on a preset sampling frequency and preprocessing the position data and the speed data;

a test unit: the vehicle-mounted GPS terminal is used for sending the test signal to the anti-external-damage monitoring platform at the sending frequency;

the communication early warning unit: the vehicle-mounted GPS terminal is used for sending the position data and the speed data to the anti-external-damage monitoring platform when receiving the feedback of the anti-external-damage monitoring platform to the test signal, otherwise, generating a first early warning signal;

a calculation unit: the system comprises a monitoring platform for preventing external damage, a data processing module and a data processing module, wherein the monitoring platform is used for calculating the linear distance between a construction vehicle and a power transmission line according to the preprocessed position data and speed data and by combining with pre-stored power transmission line construction data;

prevent outer broken early warning unit: and the early warning device is used for comparing the linear distance with the length of the arm lever of the construction vehicle and sending an external damage prevention early warning signal to the construction vehicle when the linear distance is smaller than the length of the arm lever.

Optionally, the obtaining unit is specifically configured to:

calculating difference values of position data and speed data obtained by two adjacent sampling points respectively, and taking data corresponding to the two adjacent sampling points as outlier data when the difference values are larger than a preset threshold value;

when the position data and the speed data corresponding to the same sampling point are outliers, adjusting the outliers based on a moving average filtering method;

when only the corresponding position data of the same sampling point is the outlier data, adjusting the outlier data based on the ratio of the speed data corresponding to the sampling point to the preset sampling frequency;

and when only the corresponding speed data of the same sampling point is the outlier data, adjusting the outlier data based on the product of the corresponding position data and the predicted sampling frequency at two adjacent sides of the sampling point.

Optionally, the test unit is specifically configured to:

determining initial sending frequency, and determining acceleration data of the construction vehicle according to the change rate of the speed data;

judging the directions of the acceleration and the speed of the construction vehicle according to the acceleration data and the speed data;

if the acceleration and the speed of the construction vehicle are in the same direction, and the acceleration is increased, the sending frequency is increased;

if the acceleration and the speed of the construction vehicle are opposite, and the acceleration is increased, reducing the sending frequency;

and the vehicle-mounted GPS terminal generates a pulse signal with the adjusted sending frequency and sends the pulse signal to the external damage prevention monitoring platform.

Optionally, the external damage prevention early warning unit is specifically configured to:

comparing the linear distance with the length of an arm lever of the construction vehicle;

if the length of the arm lever is less than the length of the arm lever, sending a second early warning signal to the construction vehicle;

after the second early warning signal is sent out, if the linear distance is still smaller than the length of the arm lever after the preset time, the third early warning signal is sent to operation and maintenance personnel in the power transmission line protection area.

The technical scheme provided by the invention has the beneficial effects that:

on the basis of the traditional anti-external-damage monitoring technology based on GPS positioning, the influence of wireless communication equipment on the monitoring effect is considered, the speed condition of a construction vehicle is effectively combined, tests with different frequencies are carried out on the construction vehicles with different moving speeds, normal communication is ensured, the different requirements of the different moving speeds on the testing frequencies are considered, and the service redundancy caused by excessively frequent testing signals on the communication equipment between an anti-external-damage monitoring platform and a vehicle-mounted GPS terminal is reduced as far as possible.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a fault early warning method for preventing external damage to a transmission line according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of outliers;

fig. 3 is a block diagram of a fault early warning device for preventing external damage to a power transmission line according to another embodiment of the present invention.

Detailed Description

To make the structure and advantages of the present invention clearer, the structure of the present invention will be further described with reference to the accompanying drawings.

Example one

As shown in fig. 1, the present embodiment provides a fault early warning method for preventing external damage to a power transmission line, including:

s1: acquiring position data and speed data of a construction vehicle based on a preset sampling frequency through a vehicle-mounted GPS terminal and preprocessing the position data and the speed data;

s2: determining the sending frequency of the test signal according to the preprocessed speed data, and sending the test signal to the anti-external-damage monitoring platform through the vehicle-mounted GPS terminal at the sending frequency;

s3: when the vehicle-mounted GPS terminal receives the feedback of the anti-external-damage monitoring platform to the test signal, the position data and the speed data are sent to the anti-external-damage monitoring platform, and otherwise, a first early warning signal is generated;

s4: calculating the linear distance between a construction vehicle and the power transmission line by combining pre-stored power transmission line construction data according to the preprocessed position data and speed data through the external damage prevention monitoring platform;

s5: and comparing the linear distance with the length of the arm lever of the construction vehicle, and sending an external damage prevention early warning signal to the construction vehicle when the linear distance is smaller than the length of the arm lever.

On the basis of the traditional external damage prevention monitoring technology based on GPS positioning, the influence of wireless communication equipment on the monitoring effect is considered, the speed condition of the construction vehicle is effectively combined, and different frequencies are tested aiming at the construction vehicles with different moving speeds, so that the normal communication is ensured. In this embodiment, each construction vehicle is provided with a vehicle-mounted GPS terminal, each vehicle-mounted GPS terminal has a unique terminal number, the vehicle-mounted GPS terminal includes a central processing unit, a GPS module and a wireless communication module, and the GPS module and the wireless communication module perform information interaction with the central processing unit through a bus. The anti-external-damage monitoring platform is developed based on a B/S architecture, namely a browser and server architecture mode, and is a structure which changes or improves a C/S architecture along with the rise of Internet technology. Under this architecture, the user work interface is implemented through a WWW browser. According to the embodiment, a map positioning technology, a spatial database and an internet of things technology are combined on the basis of a B/S (browser/server) framework, an external damage prevention monitoring platform displays the position of an overhead line or a cable line of a construction site through a large map screen, the change information of the position of a construction vehicle is monitored in real time, and an alarm prompt is given in time according to a system preset value to inform relevant managers and site construction responsible persons. Historical warning information and historical construction vehicle driving track information can be checked. The special alarm event can generate an external damage prevention event work order and carry out event work order business process processing.

In this embodiment, the acquiring and preprocessing the position data and the speed data of the construction vehicle by the vehicle-mounted GPS terminal based on the preset sampling frequency includes:

calculating difference values of position data and speed data obtained by two adjacent sampling points respectively, and taking data corresponding to the two adjacent sampling points as outlier data when the difference values are larger than a preset threshold value;

when the position data and the speed data corresponding to the same sampling point are outliers, adjusting the outliers based on a moving average filtering method;

when only the corresponding position data of the same sampling point is the outlier data, adjusting the outlier data based on the ratio of the speed data corresponding to the sampling point to the preset sampling frequency;

and when only the corresponding speed data of the same sampling point is the outlier data, adjusting the outlier data based on the product of the corresponding position data and the predicted sampling frequency at two adjacent sides of the sampling point.

When the difference between two adjacent sampling points is greater than the preset threshold, it is indicated that there may be outliers in the two sampling points, and as can be seen from fig. 2, the circled points are outliers, and in order to facilitate calculation and improve the accuracy of data preprocessing, both the two sampling points are treated as outliers in this embodiment. When the position data and the speed data corresponding to the same sampling point are both outliers, the position data and the speed data at the moment are not accurate, and therefore the outliers are adjusted based on a moving average filtering method, overlarge errors are eliminated, and data smoothing is achieved. When only the corresponding position data of the same sampling point is outlier data, it is shown that the speed data is accurate, and under the condition of known sampling frequency, the ratio of the speed data to the preset sampling frequency can be calculated based on the relation between the speed, the displacement and the time to obtain the accurate position data. And when only the corresponding speed data of the same sampling point is outlier data, the position data is accurate, and in the same way, the product of the position data corresponding to two adjacent sides of the sampling point and the predicted sampling frequency is calculated to obtain accurate speed data.

Through the data preprocessing process, errors generated by the GPS module in the data acquisition process can be reduced to the greatest extent, and the accuracy of data is improved.

In this embodiment, the determining, according to the preprocessed speed data, a sending frequency of the test signal, and sending the test signal to the anti-external-damage monitoring platform through the vehicle-mounted GPS terminal at the sending frequency includes:

determining an initial transmission frequency, and determining acceleration data of the construction vehicle according to a change rate of the speed data, wherein the initial transmission frequency is manually preset in the embodiment.

Judging the directions of the acceleration and the speed of the construction vehicle according to the acceleration data and the speed data; if the acceleration of the construction vehicle is in the same direction as the speed, when the acceleration is increased, the construction vehicle moves in an accelerating way, so that the change speed of the relative position of the construction vehicle and the power transmission line is higher, the sending frequency is increased under the condition, the test interval is shortened, and the monitoring strength of the communication condition is improved; if the acceleration and the speed of the construction vehicle are opposite and the acceleration is increased, the construction vehicle is decelerated and moves, so that the change speed of the relative position of the construction vehicle and the power transmission line is low, the sending frequency is reduced under the condition to increase the test interval, the service redundancy of the test signal to the communication equipment is reduced as much as possible, and the communication pressure is properly reduced.

And finally, the vehicle-mounted GPS terminal generates a pulse signal with the adjusted sending frequency and sends the pulse signal to the external damage prevention monitoring platform.

Through the process, the construction vehicles with different moving speeds are tested at different frequencies, normal communication is ensured, different requirements of different moving speeds on the testing frequencies are considered, and business redundancy caused by too frequent testing signals on communication equipment between the anti-external-damage monitoring platform and the vehicle-mounted GPS terminal is reduced as far as possible.

When the vehicle-mounted GPS terminal receives the feedback of the anti-external-damage monitoring platform to the test signal, the communication is normal at the moment, the position data and the speed data are sent to the anti-external-damage monitoring platform, and otherwise, a first early warning signal is generated. The first early warning signal indicates that the communication condition between the current vehicle-mounted GPS terminal and the outer-damage-prevention monitoring platform exists, and the position data and the speed data cannot be sent to the outer-damage-prevention monitoring platform so as to remind a construction vehicle.

In this embodiment, the power transmission line construction data includes coordinates of a tower in the power transmission line protection area and a horizontal distance D between a side phase conductor and the center of the power transmission line₁And the shortest distance H between the side phase conductor pair and the ground₁；D₁、H₁The value ranges of (A) are all positive numbers.

Obtaining a first coordinate of a starting point tower pole and a second coordinate of a terminal point tower pole in the power transmission line protection area according to the position data, and determining a central connection line equation f of the starting point tower pole and the terminal point tower according to the first coordinate and the second coordinate₁(x)；

According to the real-time coordinates (LonA, LatA) of the construction vehicle, LonA is the longitude of the real-time coordinates, LatA is the latitude of the real-time coordinates, an equation f which passes through the real-time coordinates and is connected with the center is determined₁(x) Vertical linear equation f₂(x)；

Determination of f₁(x) And f₂(x) Coordinates (LonB, LatB) of the intersection point J, wherein LonB is the longitude of the intersection point J, LatB is the latitude of the intersection point J, and the horizontal distance D of the construction vehicle to the center of the power transmission line is calculated based on a formula I and a formula II;

c ═ sin (lata) × sin (latb) + cos (lata) × cos (LonA-LonB) formula one;

d ═ R × arccos (c) x (pi/180) formula two;

wherein C is an intermediate variable, R is the radius of the earth, the value ranges of C, LatA, LatB, LonA and LonB are real numbers, and the value range of D, R is a positive number;

according to the horizontal distance D of the construction vehicle to the center of the power transmission line and the horizontal distance D of the side phase lead to the center of the power transmission line₁Calculating the horizontal distance HD of the opposite side phase conductor of the construction vehicle, wherein the value range of the HD is positive;

according to the Pythagorean theorem, consisting of HD and H₁And calculating the linear distance between the construction vehicle and the side phase conductor of the power transmission line.

In this embodiment, the comparing the linear distance with the arm lever length of the construction vehicle, when the linear distance is less than the arm lever length, sending an anti-external damage warning signal to the construction vehicle, includes:

comparing the linear distance with the length of an arm lever of the construction vehicle;

if the length of the arm lever is less than the length of the arm lever, sending a second early warning signal to the construction vehicle;

after the second early warning signal is sent out, if the linear distance is still smaller than the length of the arm lever after the preset time, the third early warning signal is sent to operation and maintenance personnel in the power transmission line protection area.

After the second early warning signal is sent out, the distance between the construction vehicle and the power transmission line is still smaller than the length of the arm rod after the construction vehicle passes through the preset time, and it is indicated that the construction vehicle does not make corresponding response. And in order to prevent the power transmission line from being damaged by external force, continuously sending a third early warning signal, and responding by operation and maintenance personnel in a power transmission line protection area. The second early warning signal and the third early warning signal are set to monitor the condition of processing the warning, provide a second safeguard measure for intelligent monitoring warning, and avoid the influence on the response of the warning message due to certain uncontrollable factors.

Example two

As shown in fig. 3, the present embodiment provides a fault early warning device 6 for preventing external damage to a power transmission line, including:

the acquisition unit 61: the vehicle-mounted GPS terminal is used for acquiring position data and speed data of a construction vehicle based on a preset sampling frequency and preprocessing the position data and the speed data;

the test unit 62: the vehicle-mounted GPS terminal is used for sending the test signal to the anti-external-damage monitoring platform at the sending frequency;

the communication early warning unit 63: the vehicle-mounted GPS terminal is used for sending the position data and the speed data to the anti-external-damage monitoring platform when receiving the feedback of the anti-external-damage monitoring platform to the test signal, otherwise, generating a first early warning signal;

the calculation unit 64: the system comprises a monitoring platform for preventing external damage, a data processing module and a data processing module, wherein the monitoring platform is used for calculating the linear distance between a construction vehicle and a power transmission line according to the preprocessed position data and speed data and by combining with pre-stored power transmission line construction data;

prevent outer broken early warning unit 65: and the early warning device is used for comparing the linear distance with the length of the arm lever of the construction vehicle and sending an external damage prevention early warning signal to the construction vehicle when the linear distance is smaller than the length of the arm lever.

On the basis of the traditional external damage prevention monitoring technology based on GPS positioning, the influence of wireless communication equipment on the monitoring effect is considered, the speed condition of the construction vehicle is effectively combined, and different frequencies are tested aiming at the construction vehicles with different moving speeds, so that the normal communication is ensured. In this embodiment, each construction vehicle is provided with a vehicle-mounted GPS terminal, each vehicle-mounted GPS terminal has a unique terminal number, the vehicle-mounted GPS terminal includes a central processing unit, a GPS module and a wireless communication module, and the GPS module and the wireless communication module perform information interaction with the central processing unit through a bus. The anti-external-damage monitoring platform is developed based on a B/S architecture, namely a browser and server architecture mode, and is a structure which changes or improves a C/S architecture along with the rise of Internet technology. Under this architecture, the user work interface is implemented through a WWW browser. According to the embodiment, a map positioning technology, a spatial database and an internet of things technology are combined on the basis of a B/S (browser/server) framework, an external damage prevention monitoring platform displays the position of an overhead line or a cable line of a construction site through a large map screen, the change information of the position of a construction vehicle is monitored in real time, and an alarm prompt is given in time according to a system preset value to inform relevant managers and site construction responsible persons. Historical warning information and historical construction vehicle driving track information can be checked. The special alarm event can generate an external damage prevention event work order and carry out event work order business process processing.

In this embodiment, the obtaining unit 61 is specifically configured to:

calculating difference values of position data and speed data obtained by two adjacent sampling points respectively, and taking data corresponding to the two adjacent sampling points as outlier data when the difference values are larger than a preset threshold value;

when the position data and the speed data corresponding to the same sampling point are outliers, adjusting the outliers based on a moving average filtering method;

when only the corresponding position data of the same sampling point is the outlier data, adjusting the outlier data based on the ratio of the speed data corresponding to the sampling point to the preset sampling frequency;

and when only the corresponding speed data of the same sampling point is the outlier data, adjusting the outlier data based on the product of the corresponding position data and the predicted sampling frequency at two adjacent sides of the sampling point.

When the difference between two adjacent sampling points is greater than the preset threshold, it is indicated that there may be outliers in the two sampling points, and as can be seen from fig. 2, the circled points are outliers, and in order to facilitate calculation and improve the accuracy of data preprocessing, both the two sampling points are treated as outliers in this embodiment. When the position data and the speed data corresponding to the same sampling point are both outliers, the position data and the speed data at the moment are not accurate, and therefore the outliers are adjusted based on a moving average filtering method, overlarge errors are eliminated, and data smoothing is achieved. When only the corresponding position data of the same sampling point is outlier data, it is shown that the speed data is accurate, and under the condition of known sampling frequency, the ratio of the speed data to the preset sampling frequency can be calculated based on the relation between the speed, the displacement and the time to obtain the accurate position data. And when only the corresponding speed data of the same sampling point is outlier data, the position data is accurate, and in the same way, the product of the position data corresponding to two adjacent sides of the sampling point and the predicted sampling frequency is calculated to obtain accurate speed data.

Through the data preprocessing process, errors generated by the GPS module in the data acquisition process can be reduced to the greatest extent, and the accuracy of data is improved.

In this embodiment, the test unit 62 is specifically configured to:

determining an initial transmission frequency, and determining acceleration data of the construction vehicle according to a change rate of the speed data, wherein the initial transmission frequency is manually preset in the embodiment.

Judging the directions of the acceleration and the speed of the construction vehicle according to the acceleration data and the speed data; if the acceleration of the construction vehicle is in the same direction as the speed, when the acceleration is increased, the construction vehicle moves in an accelerating way, so that the change speed of the relative position of the construction vehicle and the power transmission line is higher, the sending frequency is increased under the condition, the test interval is shortened, and the monitoring strength of the communication condition is improved; if the acceleration and the speed of the construction vehicle are opposite and the acceleration is increased, the construction vehicle is decelerated and moves, so that the change speed of the relative position of the construction vehicle and the power transmission line is low, the sending frequency is reduced under the condition to increase the test interval, the service redundancy of the test signal to the communication equipment is reduced as much as possible, and the communication pressure is properly reduced.

And finally, the vehicle-mounted GPS terminal generates a pulse signal with the adjusted sending frequency and sends the pulse signal to the external damage prevention monitoring platform.

Through the process, the construction vehicles with different moving speeds are tested at different frequencies, normal communication is ensured, different requirements of different moving speeds on the testing frequencies are considered, and business redundancy caused by too frequent testing signals on communication equipment between the anti-external-damage monitoring platform and the vehicle-mounted GPS terminal is reduced as far as possible.

When the vehicle-mounted GPS terminal receives the feedback of the anti-external-damage monitoring platform to the test signal, the communication is normal at the moment, the position data and the speed data are sent to the anti-external-damage monitoring platform, and otherwise, a first early warning signal is generated. The first early warning signal indicates that the communication condition between the current vehicle-mounted GPS terminal and the outer-damage-prevention monitoring platform exists, and the position data and the speed data cannot be sent to the outer-damage-prevention monitoring platform so as to remind a construction vehicle.

In this embodiment, the power transmission line construction data includes coordinates of a tower in the power transmission line protection area and a horizontal distance D between a side phase conductor and the center of the power transmission line₁And the shortest distance H between the side phase conductor pair and the ground₁；D₁、H₁The value ranges of (A) are all positive numbers. The calculation unit 64 is specifically configured to:

obtaining a first coordinate of a starting point tower pole and a second coordinate of a terminal point tower pole in the power transmission line protection area according to the position data, and determining a central connection line equation f of the starting point tower pole and the terminal point tower according to the first coordinate and the second coordinate₁（x）；

According to the real-time coordinates (LonA, LatA) of the construction vehicle, LonA is the longitude of the real-time coordinates, LatA is the latitude of the real-time coordinates, an equation f which passes through the real-time coordinates and is connected with the center is determined₁(x) Vertical linear equation f₂(x)；

Determination of f₁(x) And f₂(x) Coordinates (LonB, LatB) of the intersection point J, wherein LonB is the longitude of the intersection point J, LatB is the latitude of the intersection point J, and the horizontal distance D of the construction vehicle to the center of the power transmission line is calculated based on a formula I and a formula II;

c ═ sin (lata) × sin (latb) + cos (lata) × cos (LonA-LonB) formula one;

d ═ R × arccos (c) x (pi/180) formula two;

wherein C is an intermediate variable, R is the radius of the earth, the value ranges of C, LatA, LatB, LonA and LonB are real numbers, and the value range of D, R is a positive number;

according to the horizontal distance D of the construction vehicle to the center of the power transmission line and the horizontal distance D of the side phase lead to the center of the power transmission line₁Calculating the horizontal distance HD of the opposite side phase conductor of the construction vehicle, wherein the value range of the HD is positive;

according to the Pythagorean theorem, consisting of HD and H₁And calculating the linear distance between the construction vehicle and the side phase conductor of the power transmission line.

In this embodiment, the external damage prevention early warning unit 65 is specifically configured to:

comparing the linear distance with the length of an arm lever of the construction vehicle;

if the length of the arm lever is less than the length of the arm lever, sending a second early warning signal to the construction vehicle;

after the second early warning signal is sent out, if the linear distance is still smaller than the length of the arm lever after the preset time, the third early warning signal is sent to operation and maintenance personnel in the power transmission line protection area.

After the second early warning signal is sent out, the distance between the construction vehicle and the power transmission line is still smaller than the length of the arm rod after the construction vehicle passes through the preset time, and it is indicated that the construction vehicle does not make corresponding response. And in order to prevent the power transmission line from being damaged by external force, continuously sending a third early warning signal, and responding by operation and maintenance personnel in a power transmission line protection area. The second early warning signal and the third early warning signal are set to monitor the condition of processing the warning, provide a second safeguard measure for intelligent monitoring warning, and avoid the influence on the response of the warning message due to certain uncontrollable factors.

The sequence numbers in the above embodiments are merely for description, and do not represent the sequence of the assembly or the use of the components.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.