CN113112757B - Ground wire specific load change quantity measuring method, system, device and storage medium - Google Patents
Ground wire specific load change quantity measuring method, system, device and storage medium Download PDFInfo
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Abstract
The invention provides a method, a system, a device and a storage medium for measuring the specific load variation of a lead wire and a ground wire, wherein the method comprises the following steps: measuring a tension value without serious load of the tension tower insulator string by a tension sensor in advance; obtaining a vertical span of the strain tower according to the tension value actually measured without the severe load; obtaining a severe load theoretical tension value according to the vertical span of the strain tower and a preset severe load specific load variable quantity; measuring a severe load actual measurement tension value of the tension tower insulator string through the tension sensor; and adjusting the load ratio variation of the severe load according to the tension error between the actual tension value of the severe load and the theoretical tension value of the severe load. According to the invention, the real and accurate specific load variation can be effectively measured only by installing the tension sensor at the ground wire hanging point and combining the continuous gear state equation, the method is simple, effective and strong in universality, the specific load variation monitoring efficiency of the power transmission line is improved, and the safety monitoring and operation and maintenance cost of the power transmission line are saved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method, a system, a device and a storage medium for measuring the specific load change of a tension tower ground wire of a power transmission line.
Background
Electric power is an essential energy source in life, the safety of an electric power network cannot be ignored, and the safety of a lead (ground) wire in a high-voltage transmission line is also concerned as an important component of a transmission line system. However, the transmission line installed in a suspended manner is very easily affected by external loads such as ice and wind during operation, so that accidents such as disconnection and disconnection occur, the tower ground wire support and the cross arm are damaged in a deflected manner in severe cases, and even tower collapse and other phenomena occur, so that the operation safety of the transmission line is directly threatened, the safe production and ordered supply of electric power are affected, great inconvenience is brought to the life and production of people, and particularly, the influence is greater in mountains or hilly areas with severe geographical environments. Therefore, how to provide a protection measure capable of monitoring the external load of the power transmission line in real time, particularly monitoring the thickness of ice coating and mastering the safety condition of the power transmission line becomes a subject of controversial research of various power companies and research institutions.
The existing method for monitoring the external load of the ground wire aiming at the strain tower mainly comprises the following steps: wind load detection is carried out by calculating wind load by installing various wind speed sensors, or adopting observation equipment such as radar to observe wind speed in a large range, or adopting refined weather forecast data to judge the wind speed of a power transmission line and the like; the method comprises the steps of installing a tension sensor and an inclination angle sensor at a hanging point of a ground wire of the tension tower, detecting the icing condition of the wire by a method of obtaining the icing thickness of the wire through conversion according to the measurement values of the sensor, obtaining the vertical span at one side of the installed sensor through conversion according to the measurement values of the tension sensor and the inclination angle sensor before icing, calculating the unit length mass of the ground wire after icing according to the measurement values of the tension sensor and the inclination angle sensor after icing, and further calculating the icing thickness. However, the measurement method for obtaining the position and the wind speed of the power transmission line by adopting the wind speed sensor to measure or weather forecast data is very easily influenced by factors such as distortion of a wind field caused by landform and landform, non-standard observation method or limited observation condition, so that the wind speed of the power transmission line is very difficult to be measured truly and accurately, and the actual wind load condition of the power transmission line cannot be reflected accurately.
Therefore, how to simply, effectively and monitor the external load of the power transmission line under each landform with strong universality, improve the specific load change monitoring efficiency of the power transmission line, improve the accuracy of risk early warning of the power transmission line, and save the monitoring and operation and maintenance costs of the safety of the power transmission line is a problem which needs to be solved urgently in the technical field of electric power.
Disclosure of Invention
The invention aims to provide a simple, effective and strong-universality method for measuring the specific load variation of the tension tower ground wire, so that the monitoring efficiency of the external load of the tension tower power transmission line is improved, the accuracy of the risk early warning and disaster loss analysis of the power transmission line is improved, and the monitoring, operation and maintenance costs of the power transmission line safety are saved.
In order to achieve the above object, it is necessary to provide a method, a system, an apparatus and a storage medium for measuring a specific load variation of a ground wire in response to the above technical problems.
In a first aspect, an embodiment of the present invention provides a method for measuring a specific load variation of a ground wire, where the method includes the following steps:
measuring a tension value without serious load of the tension tower insulator string by a tension sensor in advance;
obtaining the vertical span of the tension tower according to the actual tension value without the severe load;
obtaining a theoretical tension value of the severe load according to the vertical span of the strain tower and a preset severe load specific load variation;
measuring a severe load actual measurement tension value of the strain tower insulator string through the tension sensor;
and adjusting the load ratio variation of the severe load according to the tension error between the actual tension value of the severe load and the theoretical tension value of the severe load.
Further, the step of measuring the tension value without serious load actually measured of the tension tower insulator string in advance through the tension sensor comprises the following steps:
measuring the tension value without serious load of the strain tower insulator string according to a specific frequency within a specific time period;
and averaging the tension value without the severe load within a specific time to obtain the tension value without the severe load actually measured.
Further, the step of obtaining the vertical span of the tension tower according to the actual measurement tension value without the severe load comprises:
obtaining a theoretical tension value without severe load according to a stress principle without severe load;
and obtaining the vertical span of the strain tower according to the theoretical tension value without the severe load and the actually measured tension value without the severe load.
Further, the step of obtaining the theoretical tension value of the severe load according to the vertical span of the tension tower and the preset severe load specific load variation amount comprises:
obtaining a severe load specific load according to the severe load specific load variation and the ground wire specific load;
establishing a continuous gear state equation according to the ground wire specific load and the severe load specific load;
solving the continuous gear state equation by adopting an iterative method to obtain the serious load wire horizontal stress;
and obtaining the theoretical tension value of the severe load according to the horizontal stress of the severe load lead and the vertical span of the strain tower.
Further, the step of adjusting the severe load specific load variation according to the tension error between the severe load actual measurement tension value and the severe load theoretical tension value includes:
obtaining the tension error according to the severe load actual measurement tension value and the severe load theoretical tension value;
and judging whether the tension error exceeds a preset allowable error, and adjusting the severe load specific load variation when the tension error exceeds the preset allowable error.
In a second aspect, an embodiment of the present invention provides a system for measuring a load change of a ground wire, where the system includes:
the measuring module is used for measuring a tension value without serious load actual measurement and a tension value with serious load actual measurement of the tension tower insulator string through the tension sensor;
the first calculation module is used for obtaining the vertical span of the strain tower according to the tension value actually measured without the severe load;
the second calculation module is used for obtaining a severe load theoretical tension value according to the vertical span of the strain tower and a preset severe load specific load variation;
and the third calculation module is used for adjusting the severe load specific load variation according to the tension error between the severe load actual measurement tension value and the severe load theoretical tension value.
Further, the second calculation module includes:
the specific load calculation module is used for obtaining the specific load of the severe load according to the specific load variation of the severe load and the specific load of the ground wire;
the equation establishing module is used for establishing a continuous gear state equation according to the ground wire specific load and the severe load specific load;
the stress calculation module is used for solving the continuous gear state equation by adopting an iteration method to obtain the horizontal stress of the serious load wire;
and the tension calculation module is used for obtaining the theoretical tension value of the severe load according to the horizontal stress of the severe load wire and the vertical span of the strain tower.
Further, the third computing module comprises:
the error calculation module is used for obtaining the tension error according to the severe load actual measurement tension value and the severe load theoretical tension value;
and the specific load adjusting module is used for judging whether the tension error exceeds a preset allowable error or not, and adjusting the severe load specific load variation when the tension error exceeds the preset allowable error.
In a third aspect, the embodiment of the present invention further provides a device for measuring a specific load change of a ground wire, where the device includes a tension sensor, an amplifier, a microprocessor, a wireless transmission device, a battery, and a photovoltaic panel;
the tension sensor is arranged at the hanging point of the ground wire of the tension tower and used for collecting tension value signals;
the amplifier is connected with the tension sensor and used for amplifying the tension value signal to obtain tension value data;
the microprocessor is connected with the amplifier and used for executing the method for measuring the specific load variation of the ground wire to calculate and process the pulling force value data to obtain the severe specific load variation;
the wireless transmission device is connected with the microprocessor and is used for transmitting the tension value data and the severe load specific load variation to a monitoring system;
the battery and the photovoltaic panel are used for supplying power to the ground wire specific load change measuring device.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the above method.
The method includes the steps that a tension sensor installed at a ground wire hanging point of a tension tower is used for measuring a tension value without serious load actual measurement of a tension tower insulator string in advance, a tension tower vertical span is obtained through analysis and calculation according to the tension value without serious load actual measurement and stress, a continuous gear state equation is established according to the assumed serious load ratio load variation, a serious load theoretical tension value is obtained after the horizontal stress of a serious load conducting wire is solved, the tension sensor is used for measuring the tension error between the serious load actual measurement tension value and the serious load theoretical tension value of the tension tower insulator string at the moment, and the assumed serious load ratio load variation is adjusted according to whether the tension error exceeds a preset allowable error or not until the effect of the accurate serious load ratio load variation is obtained. Compared with the prior art, the method has the advantages that the tension sensor is arranged at the hanging point of the lead ground wire of the tension tower to measure the tension of the insulator string, and the real specific load variation of the power transmission line can be effectively measured by combining the continuous gear state equation, so that the measuring method is simple, effective and strong in universality, the monitoring efficiency of the external load of the power transmission line of the tension tower, the risk early warning of the power transmission line and the accuracy of disaster loss analysis are improved, and the safety monitoring and operation and maintenance cost of the power transmission line are saved.
Drawings
Fig. 1 is a schematic view of an application scenario of a method for measuring the specific load variation of a ground wire in an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for measuring specific load variation of a ground wire according to an embodiment of the present invention;
FIG. 3 is a schematic view of the installation position of the tension sensor in the embodiment of the present invention;
fig. 4 is a schematic flow chart of step S11 in fig. 2, in which a tension sensor is used to measure a tension value of the tension tower insulator string without severe load measurement;
fig. 5 is a schematic flow chart of calculating the vertical span of the tension tower according to the actual tension value without the severe load in step S12 in fig. 2;
fig. 6 is a schematic flow chart illustrating the step S13 in fig. 2 of calculating the theoretical tension value of the severe load according to the vertical span of the tension tower;
fig. 7 is a schematic flow chart of the calculation of the specific load variation of the heavy load in step S14 in fig. 2;
FIG. 8 is a schematic structural diagram of a system for measuring the specific load variation of a ground wire according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the second computing module 3 in FIG. 8;
FIG. 10 is a schematic diagram of the third computing module 4 of FIG. 8;
fig. 11 is an internal structure diagram of the ground wire specific load change measuring device in the embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and it is obvious that the embodiments described below are part of the embodiments of the present invention, and are used for illustrating the present invention only, but not for limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the design calculation of the power transmission line, the value obtained by converting the load on the conducting and grounding wire with the unit length to the unit area is generally called specific load, the specific load of the conducting and grounding wire is basically changed by the action of the external load, and the measurement of the external load can be indirectly realized by measuring the variation of the specific load. The method for measuring the specific load variation of the ground wire can be applied to the terminal or the server shown in fig. 1. The terminal can be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers and portable wearable devices, and the server can be implemented by an independent server or a server cluster formed by a plurality of servers. The server can generate the final ground wire specific load variable quantity, and the generated ground wire specific load variable quantity is sent to the terminal for a user of the terminal to check and analyze, so that the external load of the actual power transmission line can be monitored.
In one embodiment, as shown in fig. 2, there is provided a method for measuring a specific load variation of a ground wire, including the following steps:
s11, measuring a tension value without serious load actually measured of the tension tower insulator string in advance through a tension sensor;
the tension sensor is installed at a hanging point of a lead ground wire of the tension tower, and is used for collecting tension value signals of the insulator string, amplifying the signals by the amplifier, transmitting the amplified signals to the microprocessor for processing to obtain tension value data under corresponding environmental conditions, and calculating the subsequent actual severe load specific load variation. As shown in fig. 4, the step S11 of measuring the tension value of the strain tower insulator string without severe load by the tension sensor in advance includes:
s111, measuring a tension value without severe load of the strain tower insulator string according to a specific frequency in a specific time period;
wherein, the specific value of the specific time period and the specific frequency can be determined according to the actual requirement. From the statistical point of view, the more the sample data, the more real and accurate the result of statistical analysis, in this embodiment, the specific frequency is selected to be 15 minutes/time, that is, sampling is performed 1 time every 15 minutes to obtain the data of the tension sensor, and the value of the specific time period is about 10 days, that is, under the windless and ice-free working conditions, when the conditions allow, the longer the time for collecting the data is, the better.
And S112, averaging the tension value without the severe load within a specific time to obtain the tension value actually measured without the severe load.
In the embodiment, under the condition of no serious load (no wind and no ice), multiple groups of real-time data of the tension sensor are collected according to specific frequency within a specific time period, and the average value of the multiple groups of real-time data is approximate to the annual tension value of the tension without serious load under the working condition, so that the effectiveness and the accuracy of the tension value without serious load are well ensured, and the reliability guarantee is provided for the accuracy of subsequent calculation.
S12, obtaining a vertical span of the strain tower according to the tension value actually measured without the severe load;
after the tension value of the actual measurement without the severe load is obtained according to the method, the theoretical tension value of the power transmission line without the severe load can be obtained according to the stress principle, and then the vertical span of the tension tower is calculated by adopting a calculation formula of the theoretical tension value of the without the severe load, as shown in fig. 5, the step S12 of obtaining the vertical span of the tension tower according to the tension value of the actual measurement without the severe load comprises the following steps:
s121, obtaining a theoretical tension value without severe load according to a stress principle without severe load;
wherein, the working condition without wind and ice is marked as n working condition, the subscripts of all variables corresponding to the working condition are n, the theoretical tension value without serious load is marked as F n The unit is N, and the calculation formula is as follows:
wherein σ 0n Is the horizontal stress of the wire in MPa; a is the sectional area of the ground wire in mm 2 (ii) a g is gravity acceleration with the unit of m/s 2 ；γ n The unit is the specific load of the ground wire and the unit is MPa; l is a vertical span at one side where the strain tower sensor is installed, and the unit is m; g is the gravity of the tension string, and the unit is N. Wherein, gamma is n G is a known quantity, and sigma can be found according to the pay-off table 0n The value is obtained.
And S122, obtaining the vertical span of the tension tower according to the theoretical tension value without the severe load and the actually measured tension value without the severe load.
Wherein, there is no severe loading theoryThe tension value is equal to the tension value measured without serious load in theory, and the types of the wires are determined, so that A, G and gamma are obtained n The method is known that the tension value measured actually without the severe load is substituted into the calculation formula (1) of the theoretical tension value without the severe load, so that the accurate value of the vertical span L on the installation side of the tension tower sensor can be obtained, the vertical span is unchanged under the conditions of no severe load and severe load, and the method can be used for establishing a continuous span state equation and solving the horizontal stress of a lead with the severe load.
S13, obtaining a theoretical tension value of the severe load according to the vertical span of the strain tower and the preset severe load specific load variation;
the severe load theoretical tension value refers to a tension value under the working conditions of wind and ice, and can be calculated by the horizontal stress of the wire when severe load occurs according to a stress principle. After the vertical span of the strain tower is obtained according to the method, a corresponding continuous span state equation is established by assuming the severe load specific load variation, and the severe load wire horizontal stress corresponding to the specific load variation is solved by using an iterative method, as shown in fig. 6, the step S13 of obtaining the theoretical tensile force value of the severe load according to the vertical span of the strain tower and the preset severe load specific load variation comprises:
s131, obtaining a severe load specific load according to the severe load specific load variation and the ground wire specific load;
the working condition of the severe load is marked as m working condition, the subscripts of all variables corresponding to the working condition are m, and the ratio of the severe load is marked as gamma m If the specific load variation is Δ γ, γ can be obtained m Is gamma m ＝γ n + Δ γ. The assumed initial value of the specific load variation in this embodiment may be set to any value greater than 0 according to an actual situation, and in subsequent software iterative calculation, the assumed initial value may be adjusted according to a certain proportion according to the actual situation, for example, the specific load γ of the ground wire is performed according to each iteration n Fixed percentage (1%) was adjusted. It should be noted that the method for adjusting the assumed specific load variation and the adjustment ratio are only used for describing the specific implementation of the method, and are not limited to the adjustment in other manners according to the application requirementsAnd (7) finishing.
S132, establishing a continuous gear state equation according to the ground wire specific load and the severe load specific load;
the state equation is an equation expressing the stress variation relation of each working condition on the premise of keeping the original line length unchanged. It is known that in the overhead line design, the calculation of general parameters can be directly solved by substituting known quantities into corresponding calculation formulas, and only if the stress and the tension cannot be directly calculated, the state equation must be solved. The transmission line runs under the condition of ever-changing working conditions, and the temperature, specific load and stress of the lead are different under each working condition, so that the lead length under each working condition is different, and the lead length and the original lead length under each working condition of the lead meet the Hooke's law, namely, the lead length increment in the span is in direct proportion to the lead stress increment and in direct proportion to the temperature increment. The state equation established in this embodiment is as follows:
wherein σ 0m 、σ 0n The horizontal stress of the lead under the working conditions of m and n is expressed in MPa; gamma ray m 、γ n The specific load of the wire under the working conditions of m and n is in MPa; e is the elastic modulus of the wire, and the unit is MPa; alpha is the linear expansion coefficient of the lead, and the unit is m/DEG C; t is t m 、t n The temperature of the lead under m and n working conditions is shown, and T is the temperature difference between the two working conditions, and the unit is; l and beta are continuous gears representing span and representing height difference angle, the unit is m and degree respectively, and the corresponding calculation formula is as follows:
wherein n is the number of steps; i =1, \8230, n is the number-grade mark; l is i0 The vertical span is the ith span; beta is a i0 Is the step height angle of the i-th gear. It should be noted that the working condition temperature difference T can be set according to the actual conditions, for example, the typhoon condition is 0 ℃, the ice coating condition is-15 ℃, and the existing method can also be adoptedThe temperature measuring method of (2) respectively measures and records the temperatures under two working conditions. Solving the continuous gear state equation (2) can obtain the horizontal stress sigma of the lead under the working condition m 0m 。
S133, solving the continuous gear state equation by adopting an iteration method to obtain the serious load lead horizontal stress;
the method for iteratively solving the equation of state (2) of the continuous gear may be any method that can be implemented by software, and is not described herein again.
And S134, obtaining the theoretical tension value of the severe load according to the horizontal stress of the severe load lead and the vertical span of the strain tower.
Wherein the wire horizontal stress is seriously loaded, i.e. the sigma under the m working conditions obtained above 0m The value is obtained. Under m working conditions, a severe load theoretical tension value F can be obtained according to the stress principle m The calculation formula of (2) is as follows:
wherein σ 0m And gamma m The variables obtained in the above steps are all known variables, and only the obtained sigma 0m And gamma m The scientific serious load theoretical tension value under the working condition m can be obtained by substituting the formula (3), the calculation method is simple and convenient, and the scientificity and the accuracy of the subsequent specific load variation adjustment are further effectively ensured.
S14, measuring a severe load actual measurement tension value of the tension tower insulator string through the tension sensor;
the measured value of the tension sensor under the condition of serious load is the measured value of the tension sensor under the condition of serious load, and the measured value is the single measured tension value.
S15, adjusting the load ratio variable quantity of the severe load according to the tension error between the actual tension value of the severe load and the theoretical tension value of the severe load.
The actual tension value of the severe load and the theoretical tension value of the severe load have no deviation or have a deviation within an allowable range under the condition that the value of the specific load variation is correct. If the tension error value is not in the allowable range, it indicates that the assumed value of the specific load variable under the m working conditions is wrong before, and necessary adjustment needs to be performed, so that the method for judging whether the value of the specific load variable is proper or not by the tension error of the severe load actual measurement tension value and the severe load theoretical tension value is simple and effective. As shown in fig. 7, the step S15 of adjusting the severe load specific load variation according to the tension error between the severe load actual measurement tension value and the severe load theoretical tension value includes:
s151, obtaining the tension error according to the tension value measured by the severe load and the theoretical tension value of the severe load;
wherein, the tension error can adopt an absolute error epsilon, namely epsilon = | F' m -F m L, F 'thereof' m 、F m Respectively is a serious load actual measurement tensile value and a serious load theoretical tensile value.
S152, judging whether the tension error exceeds a preset allowable error or not, and adjusting the severe load specific load variation when the tension error exceeds the preset allowable error.
Wherein, the preset allowable error can be set according to the actual application requirement, such as setting as the theoretical tension value F of the serious load m One tenth, etc. The tension error exceeds the preset allowable error, and the specific method for adjusting the serious load specific load variation is different. When the actual tension value of the severe load is larger than the theoretical tension value of the severe load, the formula (3) can be used for knowing the gamma m The value of (2) may be smaller, that is, the assumed severe load specific load variation Δ γ needs to be increased by a proper amount, otherwise, the assumed severe load specific load variation Δ γ needs to be decreased by a proper amount, and then the above method steps are executed again until a correct severe load specific load variation Δ γ value is solved, that is, the tension error value between the actual tension value of the severe load and the theoretical tension value of the severe load is within a preset allowable error range.
In the embodiment, the limitation of the existing method for monitoring the external load of the power transmission line is considered, only a tension sensor is arranged at the hanging point of the ground wire of the tension tower, the insulator string is sampled by actually measuring the tension value under two working conditions of no serious load and serious load according to requirements, the stress analysis of the ground wire under different working conditions and the establishment of a continuous gear state equation are combined by assuming the change of the serious load specific load, the theoretical tension value under the working condition of serious load is calculated by adopting a scientific calculation formula, and the assumed change of the serious load specific load is adjusted according to the tension error of the serious load theoretical tension value and the tension value actually measured by serious load, so that the accurate value of the change of the serious load specific load of the ground wire of the tension tower is effectively measured.
It should be noted that, although the steps in the above-mentioned flowcharts are shown in sequence as indicated by arrows, the steps are not necessarily executed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise.
In one embodiment, as shown in fig. 8, there is provided a system for measuring a change in a ground wire specific load, the system including:
the measuring module 1 is used for measuring a tension value without serious load actually measured and a tension value with serious load actually measured of the tension tower insulator string through the tension sensor;
the first calculation module 2 is used for obtaining the vertical span of the strain tower according to the tension value actually measured without the severe load;
the second calculation module 3 is used for obtaining a severe load theoretical tension value according to the vertical span of the strain tower and a preset severe load specific load variation;
and the third calculation module 4 is used for adjusting the severe load specific load variation according to the tension error between the severe load actual measurement tension value and the severe load theoretical tension value.
In one embodiment, as shown in fig. 9, the second calculation module 3 includes:
the specific load calculation module 31 is configured to obtain a severe load specific load according to the severe load specific load variation and the ground wire specific load;
the equation establishing module 32 is configured to establish a continuous gear state equation according to the ground wire specific load and the severe load specific load;
the stress calculation module 33 is used for solving the continuous gear state equation by adopting an iterative method to obtain the serious load wire horizontal stress;
and the tension calculation module 34 is used for obtaining the theoretical tension value of the severe load according to the horizontal stress of the severe load lead and the vertical span of the strain tower.
In one embodiment, as shown in fig. 10, the third computing module 4 comprises:
the error calculation module 41 is configured to obtain the tension error according to the severe load actual measurement tension value and the severe load theoretical tension value;
and the specific load adjusting module 42 is configured to determine whether the tension error exceeds a preset allowable error, and adjust the severe load specific load variation when the tension error exceeds the preset allowable error.
For specific limitations of the system for measuring the specific load variation of the ground wire, reference may be made to the above limitations of the method for measuring the specific load variation of the ground wire, and details thereof are not described herein again. All or part of each module in the ground wire specific load change measurement system can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 11, there is provided a ground wire specific load change measuring device, which comprises a tension sensor 101, an amplifier 102, a microprocessor 103, a wireless transmission device 104, a battery and a photovoltaic panel 105;
the tension sensor 101 is installed at a hanging point of a ground wire of the tension tower and used for collecting tension value signals;
the amplifier 102 is connected with the tension sensor 101 and is used for amplifying the tension value signal to obtain tension value data;
the microprocessor 103 is connected to the amplifier 102, and is configured to perform the above-mentioned method for measuring a specific load change of the ground wire, to calculate and process the data of the tensile value, so as to obtain a severe specific load change;
the wireless transmission device 104 is connected with the microprocessor 103 and is used for transmitting the tension value data and the severe load specific load variation to a monitoring system;
the battery and photovoltaic panel 105 is used for supplying power to the ground wire specific load change measuring device.
The monitoring system is in communication connection with the wireless transmission device 104 and is used for receiving, checking and displaying the tension value data and the serious load specific load variation, and management personnel can conveniently monitor and maintain the external load of the transmission line grounding wire in real time.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method.
To sum up, the method, the system, the device and the storage medium for measuring the ground wire specific load variation provided by the embodiment of the invention acquire the data of the tension value according to the specific frequency in the working condition without severe load (no wind and no ice) through the tension sensor installed at the hanging point of the ground wire of the tension tower, take the average adopted value in the time period as the actually measured tension value of the working condition year, calculate the vertical span of the tension tower according to the actually measured tension value without severe load and the stress principle, obtain the corresponding horizontal stress of the wire under the severe load working condition by assuming the variation of the conductor specific load under the severe load working condition (wind, ice, wind and ice, and the like) and establishing a continuous-gear state equation, iteratively solve the horizontal stress of the wire under the severe load working condition, further obtain the theoretical tension value of the severe load by combining the stress principle and a scientific calculation formula, and judge whether the error of the tension value of the insulator string of the severe load measured by the tension sensor is in the allowable error range and adjust the variation of the assumed specific load, thus obtaining the accurate tension value of the string of the severe load. When the method is used for measuring the actual specific load change of the ground wire by a user, the measuring method is simple, effective and high in universality, the limitation of the prior art is overcome, the monitoring efficiency of the external load of the power transmission line of the strain tower is improved, the accuracy of risk early warning and disaster loss analysis of the power transmission line is improved, and the monitoring, operation and maintenance cost of the safety of the power transmission line is saved.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above.
The embodiments in this specification are described in a progressive manner, and all the same or similar parts of the embodiments are directly referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, for embodiments of the system, the computer device, and the storage medium, since they are substantially similar to the method embodiments, the description is relatively simple, and in relation to the description, reference may be made to some portions of the description of the method embodiments. It should be noted that, the technical features of the embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several preferred embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these should be construed as the protection scope of the present application. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.
Claims (10)
1. A method for measuring the specific load variation of a lead wire and a ground wire is characterized by comprising the following steps of:
measuring a tension value without serious load of the tension tower insulator string by a tension sensor in advance;
obtaining the vertical span of the tension tower according to the actual tension value without the severe load;
under the condition that the hanging points of the strain tower are equal in height, obtaining a severe load theoretical tension value according to the vertical span of the strain tower and a preset severe load specific load variation;
measuring a severe load actual measurement tension value of the strain tower insulator string through the tension sensor;
and adjusting the load ratio variation of the severe load according to the tension error between the actual tension value of the severe load and the theoretical tension value of the severe load.
2. The method for measuring the specific load variation of the ground wire according to claim 1, wherein the step of measuring the tension value of the tension tower insulator string without severe load measurement in advance through the tension sensor comprises the following steps:
measuring the tension value without serious load of the tension tower insulator string according to the specific frequency in a specific time period;
and averaging the tension value without the severe load within a specific time to obtain the tension value without the severe load actually measured.
3. The method for measuring the specific load variation of the ground wire according to claim 1, wherein the step of obtaining the vertical span of the tension tower according to the tension value measured without the severe load comprises:
obtaining a theoretical tension value without severe load according to a stress principle without severe load;
and obtaining the vertical span of the tension tower according to the theoretical tension value without the severe load and the actually measured tension value without the severe load.
4. The method for measuring the specific load variation of the ground wire according to claim 1, wherein the step of obtaining the theoretical tensile force value of the severe load according to the vertical span of the strain tower and the preset specific load variation of the severe load comprises:
obtaining a severe load specific load according to the severe load specific load variation and the ground wire specific load;
establishing a continuous gear state equation according to the ground wire specific load and the severe load specific load;
solving the continuous gear state equation by adopting an iterative method to obtain the serious load wire horizontal stress;
and obtaining the theoretical tension value of the severe load according to the horizontal stress of the severe load lead and the vertical span of the strain tower.
5. The method for measuring the specific load variation of the ground wire according to claim 4, wherein the step of adjusting the specific load variation of the severe load according to the tensile error between the actually measured tensile force value of the severe load and the theoretical tensile force value of the severe load comprises:
obtaining the tension error according to the severe load actual measurement tension value and the severe load theoretical tension value;
and judging whether the tension error exceeds a preset allowable error, and adjusting the severe load specific load variation when the tension error exceeds the preset allowable error.
6. A system for measuring the specific load variation of a ground wire is characterized by comprising:
the measuring module is used for measuring a tension value without serious load actual measurement and a tension value with serious load actual measurement of the tension tower insulator string through the tension sensor;
the first calculation module is used for obtaining the vertical span of the tension tower according to the actual measurement tension value without the severe load;
the second calculation module is used for obtaining a theoretical tension value of the severe load according to the vertical span of the strain tower and the preset severe load specific load variation under the condition that the hanging points of the strain tower are equal in height;
and the third calculation module is used for adjusting the severe load specific load variation according to the tension error between the severe load actual measurement tension value and the severe load theoretical tension value.
7. The system for measuring the specific load change of the ground wire according to claim 6, wherein the second calculating module comprises:
the specific load calculation module is used for obtaining the specific load of the severe load according to the specific load variation of the severe load and the specific load of the ground wire;
the equation establishing module is used for establishing a continuous gear state equation according to the ground wire specific load and the severe load specific load;
the stress calculation module is used for solving the continuous gear state equation by adopting an iteration method to obtain the horizontal stress of the serious load wire;
and the tension calculation module is used for obtaining the theoretical tension value of the severe load according to the horizontal stress of the severe load wire and the vertical span of the strain tower.
8. The system for measuring the specific load change of the ground wire according to claim 7, wherein the third calculating module comprises:
the error calculation module is used for obtaining the tension error according to the severe load actual measurement tension value and the severe load theoretical tension value;
and the specific load adjusting module is used for judging whether the tension error exceeds a preset allowable error or not, and adjusting the severe load specific load variation when the tension error exceeds the preset allowable error.
9. The device for measuring the specific load change of the ground wire is characterized by comprising a tension sensor, an amplifier, a microprocessor, a wireless transmission device, a battery and a photovoltaic panel;
the tension sensor is arranged at the hanging point of the ground wire of the tension tower and used for collecting tension value signals;
the amplifier is connected with the tension sensor and used for amplifying the tension value signal to obtain tension value data;
the microprocessor is connected with the amplifier and used for executing the method for measuring the specific load variation of the ground wire according to any one of claims 1 to 5 to calculate and process the pulling force value data to obtain the severe specific load variation;
the wireless transmission device is connected with the microprocessor and is used for transmitting the tension value data and the severe load specific load variable quantity to a monitoring system;
the battery and the photovoltaic panel are used for supplying power to the ground wire specific load change measuring device.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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