Transmission line performance monitoring method, device, electronic equipment and storage medium

Abstract

The present invention discloses a performance monitoring method, device, electronic device and storage medium for a transmission line, including: obtaining real-time environmental information of a target transmission line, the real-time environmental information including real-time air humidity, ambient temperature, wind speed and dry air density; determining the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between ambient temperature and vapor pressure; determining the equivalent precipitation rate based on the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time, using wind speed and the dry air density, so as to determine the real-time ice growth of the target transmission line; calculating the wind load and ice load of the target transmission line according to the real-time ice growth, and obtaining the wind-ice load of the target transmission line; determining the performance monitoring result of the target transmission line based on the relationship between the wind-ice load of the target transmission line and the preset load of the target transmission line. This scheme improves the accuracy of judging the damage of the transmission line.

Description

Technical Field

[0001] The present invention relates to the field of power emergency and disaster loss assessment, and in particular to a method, device, electronic equipment and storage medium for monitoring the performance of a power transmission line. Background Art

[0002] Transmission line icing failures endanger the safety of electricity use in various countries. They bring many inconveniences to people's daily lives and cause irreparable economic losses to society. The precipitation rate is an important parameter for obtaining the ice growth. In the existing technology, an ice growth model can be constructed based on meteorological and environmental data to obtain the wind ice load results of the transmission line and determine the probability of line disconnection.

[0003] In the prior art, different ice growth calculation methods are proposed for rime, rime, mixed rain, rime and wet snow. In actual applications, the icing prediction system reads the corresponding calculation model according to different weather conditions, and the calculation efficiency is low. In addition, under certain weather conditions, such as rime weather and other "little / no precipitation, high humidity" weather, the accuracy of ice growth calculation may be reduced, thereby affecting the judgment of the damage to the transmission line. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a method, device, electronic device and storage medium for monitoring the performance of a power transmission line, so as to improve the accuracy of determining the damage status of the power transmission line.

[0005] According to a first aspect, an embodiment of the present invention provides a method for monitoring performance of a power transmission line, comprising:

[0006] Acquire real-time environmental information of the target transmission line, wherein the real-time environmental information includes real-time air humidity, ambient temperature, wind speed, and dry air density;

[0007] Determining the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure;

[0008] Based on the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the power transmission line per unit time, the equivalent precipitation rate is determined using the wind speed and the dry air density to determine the real-time ice growth amount of the target power transmission line;

[0009] Calculating the wind load and ice load of the target transmission line according to the real-time ice growth amount to obtain the wind-ice load of the target transmission line;

[0010] Based on the magnitude relationship between the wind-ice load of the target transmission line and a preset load of the target transmission line, a performance monitoring result of the target transmission line is determined.

[0011] The performance monitoring method of the transmission line provided in the embodiment of the present invention calculates the real-time vapor pressure in weather with high humidity and calculates the equivalent precipitation rate. Based on the equivalent precipitation rate, the real-time ice growth of the transmission line to be monitored is determined, and then the wind-ice load is calculated according to the equivalent precipitation rate. Thus, by further judging the size of the wind-ice load and the preset load of the transmission line, it is determined whether the transmission line is damaged, thereby achieving the purpose of monitoring the performance of the transmission line. Moreover, this method can be used in weather conditions with no precipitation but high humidity, thereby improving the efficiency and accuracy of judging the performance of the transmission line.

[0012] In one embodiment, determining the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure includes:

[0013] Calculate the vapor pressure E according to the following formula:

[0014]

[0015] The real-time vapor pressure corresponding to the real-time air humidity is calculated according to the following formula:

[0016] E * =RH×E

[0017] In the formula, E represents the vapor pressure, T represents the ambient temperature, A1 represents the first coefficient, A2 represents the second coefficient, T * Indicates the temperature threshold, E * represents the real-time vapor pressure, and RH represents the real-time air humidity.

[0018] In one embodiment, the determining of the equivalent precipitation rate based on the correspondence between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the power transmission line per unit time and using the wind speed and the dry air density includes:

[0019] Determining the water vapor density corresponding to the dry air density based on the corresponding relationship between the dry air density and the water vapor density;

[0020] converting the ambient temperature into absolute humidity based on the real-time vapor pressure;

[0021] The equivalent precipitation rate is determined based on the water vapor density, the absolute humidity, and the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the power transmission line per unit time.

[0022] In one embodiment, the equivalent precipitation rate is calculated using the following formula:

[0023]

[0024] Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, C 线路represents the perimeter of the transmission line, l 线路 represents the length of the transmission line, ρ 水汽 represents water vapor density, H represents absolute humidity, c 冰 It indicates the percentage of unit amount of water vapor condensing on the surface of the transmission line.

[0025] The performance monitoring method of the transmission line provided in the embodiment of the present invention first calculates the water vapor density and absolute humidity based on the obtained dry air density, ambient temperature and saturated vapor pressure, and calculates the equivalent precipitation rate based on the correspondence between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time and known parameters, thereby providing a method for calculating the equivalent precipitation rate for weather with no precipitation and high humidity, thereby providing calculation parameters for calculating the ice growth amount.

[0026] In one embodiment, determining the real-time ice growth amount of the target transmission line includes:

[0027] Based on the equivalent precipitation rate and the ice growth model, calculating the initial ice growth amount, wherein the ice growth model is used to represent the relationship between the equivalent precipitation rate and the ice growth amount;

[0028] Calculating the amount of ice melt based on the ambient temperature and the heat of melting;

[0029] The difference between the initial ice cover growth amount and the ice melting amount is calculated, and the difference is used as the real-time ice cover growth amount of the target transmission line.

[0030] In one embodiment, the wind load is calculated according to the following formula:

[0031] q 风 =C1a(R0+R r )v 2

[0032] The ice load is calculated according to the following formula:

[0033] q 冰 =C2ρ 冰 πR0(2R0+R r )L 垂直档距

[0034] In the formula, q 风 represents the wind load, C1 represents the wind load coefficient, a represents the wind speed unevenness coefficient, R0 represents the radius of the target transmission line, R r represents the real-time ice growth, v represents the wind speed, q 冰 represents the ice load, C2 represents the ice load coefficient, ρ 冰 represents the ice density, L 垂直档距 Indicates the vertical spacing of line towers.

[0035] In one embodiment, the determining the performance monitoring result of the target transmission line based on the magnitude relationship between the wind ice load of the target transmission line and the preset load of the target transmission line includes:

[0036] Calculating the sum of the wind load and the ice load of the target transmission line to obtain the wind-ice load;

[0037] When the wind-ice load of the target transmission line is greater than a preset load of the target transmission line, it is determined that the target transmission line is in a damaged state.

[0038] According to a second aspect, an embodiment of the present invention provides a performance monitoring device for a power transmission line, the device comprising:

[0039] An information acquisition module is used to acquire real-time environmental information of the target transmission line, wherein the real-time environmental information includes real-time air humidity, ambient temperature, wind speed and dry air density;

[0040] A real-time vapor pressure determination module, configured to determine the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure;

[0041] An ice growth determination module is used to determine the equivalent precipitation rate based on the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time, using the wind speed and the dry air density, so as to determine the real-time ice growth of the target transmission line;

[0042] A wind and ice load determination module, configured to calculate the wind load and ice load of the target transmission line according to the real-time ice growth amount, and obtain the wind and ice load of the target transmission line;

[0043] The result determination module is used to determine the performance monitoring result of the target transmission line based on the magnitude relationship between the wind ice load of the target transmission line and the preset load of the target transmission line.

[0044] In one embodiment, the real-time vapor pressure determination module comprises:

[0045] Calculate the vapor pressure E according to the following formula:

[0046]

[0047] The real-time vapor pressure corresponding to the real-time air humidity is calculated according to the following formula:

[0048] E * =RH×E

[0049] In the formula, E represents the vapor pressure, T represents the ambient temperature, A1 represents the first coefficient, A2 represents the second coefficient, T * Indicates the temperature threshold, E * represents the real-time vapor pressure, and RH represents the real-time air humidity.

[0050] In one embodiment, the ice coverage growth amount determination module includes:

[0051] a water vapor density determination subunit, configured to determine the water vapor density corresponding to the dry air density based on a correspondence between the dry air density and the water vapor density;

[0052] an absolute humidity determination subunit, configured to convert the ambient temperature into absolute humidity based on the real-time vapor pressure;

[0053] The equivalent precipitation rate determination subunit is used to determine the equivalent precipitation rate based on the water vapor density, the absolute humidity, and the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time.

[0054] In one embodiment, the equivalent precipitation rate determination subunit includes:

[0055] The equivalent precipitation rate is calculated using the following formula:

[0056]

[0057] Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, C 线路 represents the perimeter of the transmission line, l 线路 represents the length of the transmission line, ρ 水汽 represents water vapor density, H represents absolute humidity, c 冰 It indicates the percentage of unit amount of water vapor condensing on the surface of the transmission line.

[0058] In one embodiment, the ice growth amount determination module further includes:

[0059] An initial icing growth amount calculation subunit, used to calculate the initial icing growth amount based on the equivalent precipitation rate and the icing growth model, wherein the icing growth model is used to represent the relationship between the equivalent precipitation rate and the icing growth amount;

[0060] An ice melting amount calculation subunit, used for calculating the ice melting amount based on the ambient temperature and the melting heat;

[0061] The real-time ice cover growth amount is used to calculate the difference between the initial ice cover growth amount and the ice melting amount, and the difference is used as the real-time ice cover growth amount of the target transmission line.

[0062] In one embodiment, the wind ice load determination module includes:

[0063] The wind load is calculated according to the following formula:

[0064] q 风 =C1a(R0+R r )v 2

[0065] The ice load is calculated according to the following formula:

[0066] q 冰 =C2ρ 冰 πR0(2R0+R r )L 垂直档距

[0067] In the formula, q 风 represents the wind load, C1 represents the wind load coefficient, a represents the wind speed unevenness coefficient, R0 represents the radius of the target transmission line, R r represents the real-time ice growth, v represents the wind speed, q 冰 represents the ice load, C2 represents the ice load coefficient, ρ 冰 represents the ice density, L 垂直档距 Indicates the vertical spacing of line towers.

[0068] In one embodiment, the result determination module includes:

[0069] a wind-ice load calculation subunit, configured to calculate the sum of the wind load and the ice load of the target transmission line to obtain the wind-ice load;

[0070] The performance judgment subunit is used to determine that the target transmission line is in a damaged state when the wind and ice load of the target transmission line is greater than a preset load of the target transmission line.

[0071] According to the third aspect, an embodiment of the present invention provides an electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the performance monitoring method of the transmission line described in the first aspect or any one of the embodiments of the first aspect by executing the computer instructions.

[0072] According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the performance monitoring method of the transmission line described in the first aspect or any one embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0074] Figure 1 is a flow chart of a method for monitoring performance of a power transmission line according to an embodiment of the present invention;

[0075] Figure 2 is a flow chart for determining an equivalent precipitation rate according to an embodiment of the present invention;

[0076] Figure 3 is a flow chart of determining real-time ice growth according to an embodiment of the present invention;

[0077] Figure 4 is a flow chart of determining a performance monitoring result of a target transmission line according to an embodiment of the present invention;

[0078] Figure 5 is a schematic diagram of a performance monitoring device for a power transmission line according to an embodiment of the present invention;

[0079] Figure 6 is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present invention;

[0080] Figure 7 It is a schematic diagram of ice growth and melting time periods according to an embodiment of the present invention. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0082] An embodiment of the present invention provides an embodiment of a method for monitoring the performance of a transmission line. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0083] Transmission line icing poses a great threat to the country's electricity safety. Usually, transmission line icing is caused by low ambient temperature and rain or snow. If the ambient temperature is low, precipitation is low and air humidity is high (for example: ambient temperature is below 0 degrees Celsius, precipitation is less than 5mm / h, and air humidity is greater than 90%), water vapor in the air will condense on the surface of the transmission line to produce ice. Appropriate precipitation rate and appropriate ambient temperature will cause transmission lines to be covered with ice. Many existing icing growth models for monitoring icing conditions require monitoring precipitation rate. However, when the precipitation rate is low or absent, monitoring icing conditions according to icing growth models requires obtaining a substitute for precipitation rate.

[0084] In this embodiment, a method for monitoring the performance of a power transmission line is provided, which can be used in terminals such as computers, mobile phones, and tablet computers. Figure 1 is a flow chart of performance monitoring of a transmission line according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0085] S11, obtaining real-time environmental information of the target transmission line.

[0086] The target transmission line is the transmission line that needs to be monitored for damage. The real-time environmental information can be obtained through measurement by measuring devices or data published by the meteorological station. Specifically, it may include air humidity, ambient temperature, wind speed, dry air density, etc. The specific environmental information can be determined based on actual needs.

[0087] S12, determining the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure.

[0088] In weather with little or no precipitation such as rime, hoarfrost, and sleet, due to high air humidity and certain ambient temperature conditions (for example, the ambient temperature is below 0 degrees Celsius), water vapor in the humid air can condense on the surface of the transmission line to form ice.

[0089] The vapor pressure can be calculated based on the ambient temperature. The vapor pressure usually refers to the saturated vapor pressure. The vapor pressure of water in the air, that is, the real-time vapor pressure, can be calculated based on the air humidity and vapor pressure.

[0090] The vapor pressure E can be calculated according to the following formula:

[0091]

[0092] The real-time vapor pressure corresponding to the real-time air humidity is calculated according to the following formula:

[0093] E * =RH×E

[0094] In the formula, E represents vapor pressure, T represents ambient temperature (unit: K), A1 represents the first coefficient, A2 represents the second coefficient, and T * Indicates the temperature threshold, E * represents the real-time vapor pressure, and RH represents the real-time air humidity (unit: %). The first coefficient, the second coefficient, and the temperature threshold are all obtained based on experimental measurements. The first coefficient A1 can be 6 to 6.5, the second coefficient A2 can be 16.5 to 18, and T * It can be 20-30. In this embodiment, A1=6.12 and A2=17.7.

[0095] S13, based on the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time, the equivalent precipitation rate is determined using the wind speed and the dry air density to determine the real-time ice growth of the target transmission line.

[0096] Ice growth is usually used to indicate the ice growth of transmission lines per unit time. Ice growth models are usually used to study the corresponding relationship between precipitation rate and ice growth. That is, in many existing ice growth models, ice growth depends on the precipitation rate, such as the Chaine & Skeates model.

[0097] In humid weather with zero precipitation, the equivalent precipitation rate can be obtained by calculating the amount of water vapor condensed on the surface of the transmission line per unit time. That is, based on the corresponding relationship between the equivalent precipitation rate and the amount of water vapor condensed on the surface of the transmission line per unit time, the equivalent precipitation rate is determined using wind speed and dry air density. The equivalent precipitation rate is brought into the ice growth model to determine the ice growth. Since the ice on the surface of the transmission line may also melt to a certain extent, the amount of ice melted in a certain period of time can be calculated based on parameters such as the convective heat transfer coefficient, ambient temperature, and ice density. The real-time ice growth can be determined by combining the amount of ice melted with the ice growth.

[0098] S14, respectively calculating the wind load and ice load of the target transmission line according to the real-time ice cover growth amount to obtain the wind-ice load of the target transmission line.

[0099] Wind load refers to the load caused by wind blowing on the equipment, which is usually related to parameters such as wind speed and real-time ice growth. Ice load refers to the load caused by ice acting on the equipment, which is usually related to parameters such as ice density and real-time ice growth. Based on the obtained real-time ice growth, environmental information and the parameter information of the target transmission line itself, the wind load and ice load of the target transmission line can be calculated. Both wind load and ice load can represent the actual load borne by the transmission line within a certain period of time. The two can be combined to obtain the wind-ice load.

[0100] S15, determining a performance monitoring result of the target transmission line based on a magnitude relationship between the wind-ice load of the target transmission line and a preset load of the target transmission line.

[0101] The transmission line has its corresponding maximum load, that is, the preset load. The wind-ice load obtained in S14 is compared with the preset load. If the wind-ice load is greater than the preset load, it can be considered that the target transmission line is damaged.

[0102] The performance monitoring method of the transmission line provided in the embodiment of the present invention calculates the real-time vapor pressure in weather with high humidity and calculates the equivalent precipitation rate. Based on the equivalent precipitation rate, the real-time ice growth of the transmission line to be monitored is determined, and then the wind-ice load is calculated according to the equivalent precipitation rate. Thus, by further judging the size of the wind-ice load and the preset load of the transmission line, it is determined whether the transmission line is damaged, thereby achieving the purpose of monitoring the performance of the transmission line. Moreover, this method can be used in weather conditions with no precipitation but high humidity, thereby improving the efficiency and accuracy of judging the performance of the transmission line.

[0103] In this embodiment, a method for monitoring the performance of a power transmission line is provided, which can be used in terminals such as computers, mobile phones, and tablet computers. Figure 2 is a flow chart of determining the equivalent precipitation rate according to an embodiment of the present invention, that is, corresponding to the above Figure 1 S13 of the embodiment shown. Figure 2 As shown, the process includes the following steps:

[0104] S21, determining the water vapor density corresponding to the dry air density based on the corresponding relationship between the dry air density and the water vapor density.

[0105] The water vapor density is calculated based on the dry air density in the environmental information obtained. The water vapor density ρ 水汽 It can be calculated in the following way:

[0106] ρ 水汽 =B×ρ 干空气

[0107] Where B is the proportionality coefficient, which can be 0.6 to 0.65, and is generally 0.622, ρ 干空气 Represents the density of dry air, which can be measured experimentally.

[0108] S22, converting the ambient temperature into absolute humidity based on the real-time vapor pressure.

[0109] The absolute humidity H can be calculated using the following formula:

[0110]

[0111] Among them, E * represents the real-time vapor pressure, which can be calculated from the ambient temperature and vapor pressure. T represents the ambient temperature, T* Indicates the temperature threshold, T * It can be 20 to 30.

[0112] S23, determining the equivalent precipitation rate based on the water vapor density, absolute humidity, and the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time.

[0113] The equivalent precipitation rate is calculated using the following formula:

[0114]

[0115] Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, C 线路 represents the perimeter of the transmission line, l 线路 represents the length of the transmission line, ρ 水汽 represents water vapor density, H represents absolute humidity, c 冰 It represents the percentage of unit amount of water vapor condensing on the surface of the transmission line, which can be obtained through experimental measurement.

[0116] The absolute humidity H and water vapor density ρ 水汽 Substituting the equation into the equivalent precipitation rate calculation formula, we get the following formula:

[0117]

[0118] Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, RH represents the real-time air humidity, T represents the ambient temperature, and T * represents the temperature threshold, A1 represents the first coefficient, A2 represents the second coefficient, wherein the first coefficient, the second coefficient and the temperature threshold are all obtained according to experimental measurements, the first coefficient A1 can be 6 to 6.5, the second coefficient A2 can be 16.5 to 18, T * It can be 20 to 30.

[0119] The performance monitoring method of the transmission line provided in the embodiment of the present invention first calculates the water vapor density and absolute humidity based on the obtained dry air density, ambient temperature and saturated vapor pressure, and calculates the equivalent precipitation rate based on the correspondence between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time and known parameters, thereby providing a method for calculating the equivalent precipitation rate for weather with no precipitation and high humidity, thereby providing calculation parameters for calculating the ice growth amount.

[0120] In this embodiment, a method for monitoring the performance of a power transmission line is provided, which can be used in terminals such as computers, mobile phones, and tablet computers. Figure 3 is a flow chart of determining the real-time ice growth amount according to an embodiment of the present invention, that is, corresponding to the above Figure 1 S13 of the embodiment shown. Figure 3 As shown, the process includes the following steps:

[0121] S31, calculate the initial ice growth based on the equivalent precipitation rate and ice growth model.

[0122] The icing growth model can be used to represent the relationship between precipitation rate and icing growth. Different icing growth models can be constructed based on the icing mechanism for different types of icing situations. In this scheme, the icing growth model is not limited. Taking the Chaine & Skeates model as an example, for the icing problem caused by precipitation, it can be generally considered that the amount of ice in a certain period of time is equal to the amount of precipitation. However, when there is wind, the amount of ice per unit time will exceed the amount of precipitation. Therefore, the parameter L is also defined in the Chaine & Skeates model. v .

[0123] When the ambient temperature is close to or below 0 degrees Celsius, let L H is the precipitation, which can be written as:

[0124] L H =P×t

[0125] Where P is the precipitation rate and t is the precipitation time. v =0.195CvP 0.88 t, v represents the average wind speed (unit: m / s), C represents the collection coefficient. If the ice is evenly distributed on the transmission line, the initial ice growth △r on the transmission line can be written as:

[0126]

[0127] Where R0 is the wire radius, and K is the ice shape correction factor that depends on the wire diameter.

[0128] In the absence of precipitation, the equivalent precipitation rate P′ is substituted into the calculation formula of ice cover growth to obtain the initial ice cover growth △r.

[0129] S32, calculating the amount of ice melted based on the ambient temperature and the heat of melting.

[0130] Under actual weather conditions, ice covering the transmission lines may melt as the temperature rises, such as Figure 7 As shown in the figure, ice increases in the time period t1-t2, and melts in the time period t2-t3. During the melting process, heat convection is the main form of heat transfer. The ice thickness r represents the actual ice thickness. The external heat exchange surface area S of the ice-covered transmission line per unit length is:

[0131] S=2π(R0+r)

[0132] If the thickness of ice melted in dτ seconds is dr', then the melted mass is:

[0133] dm=2π(R0+r)dr′×ρ 冰

[0134] The required calories are:

[0135] dQ=2π(R0+r)×ρ 冰 ×βdr′

[0136] Where β represents the heat of fusion, ρ 冰 Represents ice density, and the ice thickness r can be written as r=△r(t2-t1).

[0137] The convective heat transfer between the ice surface and the environment per unit time can be written as:

[0138] Q d =h×S×(T-273.15)

[0139] Where h is the convective heat transfer coefficient. During the melting process of ice, The amount of ice melted in τ time is r′:

[0140]

[0141] S33, calculating the difference between the ice cover growth amount and the ice melt amount, and using the difference as the real-time ice cover growth amount of the target transmission line.

[0142] It is generally considered that when the ambient temperature is below 0°C, the ice begins to grow, and when it is above 0°C, the ice begins to melt. Then the real-time ice growth rate R in the time period t1-t3 is r =△r-r', which is the difference between the ice growth and ice melting. If △r-r'<0, it can be considered that the ice has completely melted before time t3.

[0143] In this embodiment, a method for monitoring the performance of a power transmission line is provided, which can be used in terminals such as computers, mobile phones, and tablet computers. Figure 4 is a flowchart of determining the performance monitoring result of the target transmission line according to an embodiment of the present invention, that is, corresponding to the above Figure 1 S15 of the embodiment shown, as Figure 4 As shown, the process includes the following steps:

[0144] S41, calculating the sum of the wind load and the ice load of the target transmission line to obtain the wind-ice load.

[0145] Wind load refers to the load caused by wind blowing on the equipment, and ice load refers to the load caused by ice acting on the equipment.

[0146] The wind load can be calculated according to the following formula:

[0147] q 风 =C1a(R0+R r )v2

[0148] The ice load can be calculated according to the following formula:

[0149] q 冰 =C2ρ 冰 πR0(2R0+R r )L 垂直档距

[0150] In the formula, q 风 represents the wind load, C1 represents the wind load coefficient, a represents the wind speed unevenness coefficient, R0 represents the radius of the target transmission line, R r represents the real-time ice growth, v represents the wind speed, q 冰 represents the ice load, C2 represents the ice load coefficient, ρ 冰 represents the ice density, L 垂直档距 Indicates the vertical spacing of line towers.

[0151] Among them, the wind load coefficient C1 can be 1 to 2, usually C1 = 1.4, the wind speed unevenness coefficient a can be 0.7 to 1, which can be determined according to the wind speed; the ice load coefficient C2 can be 1.5×10 -8 ~2.5×10 -8 , usually C2=1.96×10 -8 , L 垂直档距 It can be determined based on the actual construction or design of the transmission tower.

[0152] The wind and ice load is the total load on the transmission line, which can be expressed as q 风 +q 风 .

[0153] S42: When the wind-ice load of the target transmission line is greater than a preset load of the target transmission line, it is determined that the target transmission line is in a damaged state.

[0154] The target transmission line has its corresponding maximum load, i.e., the preset load q 预设载荷 , if the wind ice load q 风 +q 风 >q 预设载荷 , then the target transmission line can be considered to be in a damaged state.

[0155] The performance monitoring method of the power transmission line provided by the embodiment of the present invention determines whether the power transmission line is damaged by calculating the wind-ice load and comparing the wind-ice load with the preset load of the power transmission line.

[0156] In this embodiment, a performance monitoring device for a power transmission line is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0157] This embodiment provides a performance monitoring device for a transmission line, such as Figure 6 As shown, including:

[0158] An information acquisition module 51 is used to acquire real-time environmental information of the target power transmission line, wherein the real-time environmental information includes real-time air humidity, ambient temperature, wind speed and dry air density;

[0159] A real-time vapor pressure determination module 52, configured to determine the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure;

[0160] An ice growth determination module 53 is used to determine the equivalent precipitation rate based on the correspondence between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the power transmission line per unit time, using the wind speed and the dry air density, so as to determine the real-time ice growth of the target power transmission line;

[0161] A wind and ice load determination module 54, configured to calculate the wind load and ice load of the target transmission line according to the real-time ice cover growth amount, and obtain the wind and ice load of the target transmission line;

[0162] The result determination module 55 is used to determine the performance monitoring result of the target transmission line based on the magnitude relationship between the wind ice load of the target transmission line and the preset load of the target transmission line.

[0163] In one embodiment, the real-time vapor pressure determination module 52 includes:

[0164] Calculate the vapor pressure E according to the following formula:

[0165]

[0166] The real-time vapor pressure corresponding to the real-time air humidity is calculated according to the following formula:

[0167] E * =RH×E

[0168] In the formula, E represents the vapor pressure, T represents the ambient temperature, A1 represents the first coefficient, A2 represents the second coefficient, T * Indicates the temperature threshold, E *represents the real-time vapor pressure, and RH represents the real-time air humidity.

[0169] In one embodiment, the ice coverage growth amount determination module 53 includes:

[0170] a water vapor density determination subunit, configured to determine the water vapor density corresponding to the dry air density based on a correspondence between the dry air density and the water vapor density;

[0171] an absolute humidity determination subunit, configured to convert the ambient temperature into absolute humidity based on the real-time vapor pressure;

[0172] The equivalent precipitation rate determination subunit is used to determine the equivalent precipitation rate based on the water vapor density, the absolute humidity, and the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time.

[0173] In one embodiment, the equivalent precipitation rate determination subunit includes:

[0174] The equivalent precipitation rate is calculated using the following formula:

[0175]

[0176] Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, C 线路 represents the perimeter of the transmission line, l 线路 represents the length of the transmission line, ρ 水汽 represents water vapor density, H represents absolute humidity, c 冰 It indicates the percentage of unit amount of water vapor condensing on the surface of the transmission line.

[0177] In one embodiment, the ice coverage growth amount determination module 53 further includes:

[0178] An initial icing growth amount calculation subunit, used to calculate the initial icing growth amount based on the equivalent precipitation rate and the icing growth model, wherein the icing growth model is used to represent the relationship between the equivalent precipitation rate and the icing growth amount;

[0179] An ice melting amount calculation subunit, used for calculating the ice melting amount based on the ambient temperature and the melting heat;

[0180] The real-time ice cover growth amount is used to calculate the difference between the initial ice cover growth amount and the ice melting amount, and the difference is used as the real-time ice cover growth amount of the target transmission line.

[0181] In one embodiment, the wind ice load determination module 54 includes:

[0182] The wind load is calculated according to the following formula:

[0183] q风 =C1a(R0+R r )v 2

[0184] The ice load is calculated according to the following formula:

[0185] q 冰 =C2ρ 冰 πR0(2R0+R r )L 垂直档距

[0186] In the formula, q 风 represents the wind load, C1 represents the wind load coefficient, a represents the wind speed unevenness coefficient, R0 represents the radius of the target transmission line, R r represents the real-time ice growth, v represents the wind speed, q 冰 represents the ice load, C2 represents the ice load coefficient, ρ 冰 represents the ice density, L 垂直档距 Indicates the vertical spacing of line towers.

[0187] In one embodiment, the result determination module 55 includes:

[0188] a wind-ice load calculation subunit, configured to calculate the sum of the wind load and the ice load of the target transmission line to obtain the wind-ice load;

[0189] The performance judgment subunit is used to determine that the target transmission line is in a damaged state when the wind and ice load of the target transmission line is greater than a preset load of the target transmission line.

[0190] The performance monitoring device of the power transmission line in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC circuit, a processor and a memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0191] The further functional description of each of the above modules is the same as that of the above corresponding embodiments and will not be repeated here.

[0192] See also Figure 6 , Figure 6 is a schematic diagram of the structure of an electronic device provided by an optional embodiment of the present invention, such as Figure 6As shown, the electronic device may include: at least one processor 601, such as a CPU (Central Processing Unit), at least one communication interface 603, a memory 604, and at least one communication bus 602. The communication bus 602 is used to realize the connection and communication between these components. The communication interface 603 may include a display screen (Display), a keyboard (Keyboard), and the optional communication interface 603 may also include a standard wired interface and a wireless interface. The memory 604 may be a high-speed RAM memory (Random Access Memory) or a non-volatile memory (non-volatile memory), such as at least one disk storage. The memory 604 may optionally be at least one storage device located away from the aforementioned processor 601. The processor 601 may be combined with Figure 5 In the described device, the memory 604 stores an application program, and the processor 601 calls the program code stored in the memory 604 to execute any of the above method steps.

[0193] The communication bus 602 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The communication bus 602 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0194] Among them, the memory 604 may include a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviated: RAM); the memory may also include a non-volatile memory (English: non-volatile memory), such as a flash memory (English: flash memory), a hard disk drive (English: hard disk drive, abbreviated: HDD) or a solid-state drive (English: solid-state drive, abbreviated: SSD); the memory 604 may also include a combination of the above types of memory.

[0195] The processor 601 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and a NP.

[0196] The processor 601 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0197] Optionally, the memory 604 is also used to store program instructions. The processor 601 can call the program instructions to implement the performance monitoring method of the power transmission line shown in the embodiment of the present application.

[0198] The embodiment of the present invention further provides a non-transitory computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the performance monitoring method of the power transmission line in any of the above method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above types of memory.

[0199] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for monitoring the performance of a power transmission line, characterized in that: include: Acquire real-time environmental information of the target transmission line, wherein the real-time environmental information includes real-time air humidity, ambient temperature, wind speed, and dry air density; Determining the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure; Based on the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the power transmission line per unit time, the equivalent precipitation rate is determined using the wind speed and the dry air density to determine the real-time ice growth amount of the target power transmission line; Calculating the wind load and ice load of the target transmission line according to the real-time ice growth amount to obtain the wind-ice load of the target transmission line; Determining a performance monitoring result of the target transmission line based on a magnitude relationship between the wind-ice load of the target transmission line and a preset load of the target transmission line; The method of determining the equivalent precipitation rate based on the correspondence between the equivalent precipitation rate and the amount of water vapor condensed on the surface of the power transmission line per unit time and using the wind speed and the dry air density includes: determining the water vapor density corresponding to the dry air density based on the correspondence between the dry air density and the water vapor density; converting the ambient temperature into absolute humidity based on the real-time vapor pressure; determining the equivalent precipitation rate based on the water vapor density, the absolute humidity and the correspondence between the equivalent precipitation rate and the amount of water vapor condensed on the surface of the power transmission line per unit time; The equivalent precipitation rate is calculated using the following formula: Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, C 线路 represents the perimeter of the transmission line, l 线路 represents the length of the transmission line, ρ 水汽 represents water vapor density, H represents absolute humidity, c 冰 It indicates the percentage of unit amount of water vapor condensing on the surface of the transmission line.

2. The method according to claim 1, characterized in that: The determining the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure includes: Calculate the vapor pressure E according to the following formula: The real-time vapor pressure corresponding to the real-time air humidity is calculated according to the following formula: AND * =RH×E In the formula, E represents the vapor pressure, T represents the ambient temperature, A1 represents the first coefficient, A2 represents the second coefficient, T * Indicates the temperature threshold, E * represents the real-time vapor pressure, and RH represents the real-time air humidity.

3. The method according to claim 1, characterized in that: Determining the real-time ice growth amount of the target transmission line includes: Based on the equivalent precipitation rate and the ice growth model, calculating the initial ice growth amount, wherein the ice growth model is used to represent the relationship between the equivalent precipitation rate and the ice growth amount; Calculating the amount of ice melt based on the ambient temperature and the heat of melting; The difference between the initial ice cover growth amount and the ice melting amount is calculated, and the difference is used as the real-time ice cover growth amount of the target transmission line.

4. The method according to claim 1, characterized in that: The wind load is calculated according to the following formula: q 风 =C1a(R0+R r )v 2 The ice load is calculated according to the following formula: q 冰 =C2ρ 冰 πR0(2R0+R r )L 垂直档距 In the formula, q 风 represents the wind load, C1 represents the wind load coefficient, a represents the wind speed unevenness coefficient, R0 represents the radius of the target transmission line, R r represents the real-time ice growth, v represents the wind speed, q 冰 represents the ice load, C2 represents the ice load coefficient, ρ 冰 represents the ice density, L 垂直档距 Indicates the vertical spacing of line towers.

5. The method according to claim 4, characterized in that The determining the performance monitoring result of the target transmission line based on the magnitude relationship between the wind-ice load of the target transmission line and the preset load of the target transmission line includes: Calculating the sum of the wind load and the ice load of the target transmission line to obtain the wind-ice load; When the wind-ice load of the target transmission line is greater than a preset load of the target transmission line, it is determined that the target transmission line is in a damaged state.

6. A performance monitoring device for a power transmission line, characterized in that: The device comprises: An information acquisition module is used to acquire real-time environmental information of the target transmission line, wherein the real-time environmental information includes real-time air humidity, ambient temperature, wind speed and dry air density; A real-time vapor pressure determination module, configured to determine the real-time vapor pressure corresponding to the real-time air humidity based on the corresponding relationship between the ambient temperature and the vapor pressure; An ice growth determination module is used to determine the equivalent precipitation rate based on the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time, using the wind speed and the dry air density, so as to determine the real-time ice growth of the target transmission line; A wind-ice load determination module, configured to calculate the wind load and ice load of the target transmission line according to the real-time ice cover growth amount, and obtain the wind-ice load of the target transmission line; A result determination module is used to determine the performance monitoring result of the target transmission line based on the magnitude relationship between the wind ice load of the target transmission line and the preset load of the target transmission line; the ice coverage growth amount determination module includes: a water vapor density determination subunit, configured to determine the water vapor density corresponding to the dry air density based on a correspondence between the dry air density and the water vapor density; an absolute humidity determination subunit, configured to convert the ambient temperature into absolute humidity based on the real-time vapor pressure; An equivalent precipitation rate determination subunit, used to determine an equivalent precipitation rate based on the water vapor density, the absolute humidity, and a corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the power transmission line per unit time; The equivalent precipitation rate determination subunit includes: the equivalent precipitation rate is calculated using the following formula: Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, C 线路 represents the perimeter of the transmission line, l 线路 represents the length of the transmission line, ρ 水汽 represents water vapor density, H represents absolute humidity, c 冰 It indicates the percentage of unit amount of water vapor condensing on the surface of the transmission line.

7. The device according to claim 6, characterized in that The real-time vapor pressure determination module comprises: Calculate the vapor pressure E according to the following formula: The real-time vapor pressure corresponding to the real-time air humidity is calculated according to the following formula: AND * =RH×E In the formula, E represents the vapor pressure, T represents the ambient temperature, A1 represents the first coefficient, A2 represents the second coefficient, T * Indicates the temperature threshold, E * represents the real-time vapor pressure, and RH represents the real-time air humidity.

8. The device according to claim 6, characterized in that The ice coverage growth amount determination module includes: a water vapor density determination subunit, configured to determine the water vapor density corresponding to the dry air density based on a correspondence between the dry air density and the water vapor density; an absolute humidity determination subunit, configured to convert the ambient temperature into absolute humidity based on the real-time vapor pressure; The equivalent precipitation rate determination subunit is used to determine the equivalent precipitation rate based on the water vapor density, the absolute humidity, and the corresponding relationship between the equivalent precipitation rate and the amount of condensed water vapor on the surface of the transmission line per unit time.

9. The device according to claim 8, characterized in that The equivalent precipitation rate determination subunit includes: The equivalent precipitation rate is calculated using the following formula: Among them, P′ represents the equivalent precipitation rate, v represents the wind speed, C 线路 represents the perimeter of the transmission line, l 线路 represents the length of the transmission line, ρ 水汽 represents water vapor density, H represents absolute humidity, c 冰 It indicates the percentage of unit amount of water vapor condensing on the surface of the transmission line.

10. The device according to claim 9, characterized in that The ice coverage growth amount determination module also includes: An initial icing growth amount calculation subunit, used to calculate the initial icing growth amount based on the equivalent precipitation rate and the icing growth model, wherein the icing growth model is used to represent the relationship between the equivalent precipitation rate and the icing growth amount; An ice melting amount calculation subunit, used for calculating the ice melting amount based on the ambient temperature and the melting heat; The real-time ice cover growth amount is used to calculate the difference between the initial ice cover growth amount and the ice melting amount, and the difference is used as the real-time ice cover growth amount of the target transmission line.

11. The device according to claim 6, characterized in that The wind ice load determination module includes: The wind load is calculated according to the following formula: q 风 =C1a(R0+R r )v 2 The ice load is calculated according to the following formula: q 冰 =C2ρ 冰 πR0(2R0+R r )L 垂直档距 In the formula, q 风 represents the wind load, C1 represents the wind load coefficient, a represents the wind speed unevenness coefficient, R0 represents the radius of the target transmission line, R r represents the real-time ice growth, v represents the wind speed, q 冰 represents the ice load, C2 represents the ice load coefficient, ρ 冰 represents the ice density, L 垂直档距 Indicates the vertical spacing of line towers.

12. The device according to claim 11, characterized in that The result determination module comprises: a wind-ice load calculation subunit, configured to calculate the sum of the wind load and the ice load of the target transmission line to obtain the wind-ice load; The performance judgment subunit is used to determine that the target transmission line is in a damaged state when the wind and ice load of the target transmission line is greater than a preset load of the target transmission line.

13. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the performance monitoring method of the power transmission line according to any one of claims 1 to 5 by executing the computer instructions.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the performance monitoring method of a power transmission line according to any one of claims 1 to 5.

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