CN113032972B - Power transmission and transformation line dynamic current-carrying capacity prediction method based on microenvironment monitoring - Google Patents
Power transmission and transformation line dynamic current-carrying capacity prediction method based on microenvironment monitoring Download PDFInfo
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- CN113032972B CN113032972B CN202110238489.6A CN202110238489A CN113032972B CN 113032972 B CN113032972 B CN 113032972B CN 202110238489 A CN202110238489 A CN 202110238489A CN 113032972 B CN113032972 B CN 113032972B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012544 monitoring process Methods 0.000 title claims abstract description 12
- 230000009466 transformation Effects 0.000 title claims abstract description 9
- 239000011162 core material Substances 0.000 claims abstract description 28
- 230000017525 heat dissipation Effects 0.000 claims abstract description 27
- 230000008859 change Effects 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000013178 mathematical model Methods 0.000 claims abstract description 4
- 230000007613 environmental effect Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 229910018503 SF6 Inorganic materials 0.000 claims description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical group FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/16—Cables, cable trees or wire harnesses
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
The invention provides a dynamic current-carrying capacity prediction method of a power transmission and transformation line based on microenvironment monitoring, which comprises the following steps that B1, a medium is filled between a cable inner core and an insulating layer, and the temperature T of the cable inner core is obtained through medium heat exchange Cable with improved cable characteristics The method comprises the steps of carrying out a first treatment on the surface of the B2. Guiding out the medium, heating the medium outside the cable to the T Cable with improved cable characteristics Stopping heating; B3. standing the heated medium for time t and calculating the average change rate of temperature; B4. constructing a mathematical model of the heat dissipation efficiency Vi of the power transmission line according to the average change rate of the temperature, the heat dissipation area of the medium, the specific heat capacity of the medium and the specific heat capacity of the cable inner core material obtained in the step B3; B5. according to the heat dissipation efficiency Vi of the power transmission line and the current temperature T of the cable inner core Cable with improved cable characteristics And calculating the expandable current-carrying capacity delta I by the cable inner core temperature safety upper limit Tmax.
Description
Technical Field
The invention relates to the field of dynamic capacity expansion of power systems, in particular to an intelligent monitoring system for microenvironment of a power transmission line.
Background
With the development of urban construction, new district construction is rapidly carried out, and with the development and construction of new district, the urban distribution line network needs to be built in a matched way so as to meet the requirement of urban construction development, the distribution line is composed of an overhead line and a cable line, the overhead line is erected in the air, an insulator string is fixed on an iron tower, and air is used as insulation. The method has the advantages that the investment is less, the construction period is short, the number of lines which can be erected on the same path is less, the overall power supply capacity is influenced, meanwhile, the urban planning and the attractiveness are influenced, the one-time investment of the cable lines is more, the construction period is longer than that of the overhead lines, a multi-loop cable channel can be built on the same path at one time, the land is saved, the overall power supply capacity is improved, and the urban landscape is not influenced, so that the cable lines are increasingly adopted in urban construction, particularly in places with limited line channels, the superiority of the cable lines can be reflected, the cable laying modes are many, such as direct-buried laying, pipe penetrating laying, cable trench laying and the like, the direct-buried cable is easily damaged by external force, the laying number is less, the cable trench laying can be built into multiple channels at one time, the investment is relatively high, the pipe penetrating laying can be built into multiple cable channels at one time, and the investment is lower than that of the cable trench, and the investment is relatively suitable for urban distribution network lines.
In fact, a larger margin is often left in the operation of the power transmission line, and the margin can be changed at any time according to different operation environments (such as environment temperature, humidity, wind power, illumination and other comprehensive parameters) of the power transmission line. On the basis of comprehensively considering environmental parameters, the data such as scheduling real-time monitoring is utilized to perform operation monitoring, dynamic analysis, tracking and alarming on the line needing expansion operation, so that the line, scheduling and other personnel can refer to the line, faults are convenient to process, the operation mode is reasonably arranged, the transmission capacity is improved to the maximum extent, and the purpose of dynamic capacity expansion of the power transmission line is achieved. In the prior art, the technical problem that the operation environment of the power transmission line is difficult to accurately data and model exists.
The patent document with the publication number of CN111458769A discloses a method and a system for predicting environmental meteorological data of a power transmission line, relates to the technical field of meteorological model prediction, and solves the technical problems that the traditional meteorological prediction method is poor in disturbance resistance and easy to be interfered by data. The technology is based on meteorological conditions, needs to collect a plurality of environmental parameters, and has the technical problems of complicated steps and high detection cost.
Disclosure of Invention
The invention aims to solve the technical problems that: the existing power transmission line current-carrying capacity prediction method is based on meteorological conditions, needs to collect a plurality of environmental parameters, and has the technical problems of complicated steps and high detection cost.
In order to solve the technical problems, the invention provides a method for predicting dynamic current-carrying capacity of a power transmission and transformation line based on microenvironment monitoring, which comprises the following steps that a medium is introduced between a cable inner core and an insulating layer, and the temperature T of the cable inner core is obtained through medium heat exchange Cable with improved cable characteristics ；
B2. Guiding out the medium, heating the medium outside the cable to the T Cable with improved cable characteristics Stopping heating;
B3. standing the heated medium for time t and calculating the average change rate of temperature;
B4. constructing a mathematical model of the heat dissipation efficiency Vi of the power transmission line according to the average change rate of the temperature, the heat dissipation area of the medium, the specific heat capacity of the medium and the specific heat capacity of the cable inner core material obtained in the step B3;
B5. according to the heat dissipation efficiency V of the power transmission line i Current cable core temperature T Cable with improved cable characteristics Upper limit T for cable core temperature safety max And calculating the expandable current-carrying capacity delta I.
Preferably, the method further comprises the following step B6. of dividing a whole transmission line into a plurality of sections, performing steps B1-B5 on each section to obtain a plurality of groups of data of the expandable current-carrying capacity delta I, and selecting the minimum value as a final prediction result. The preferred solution saves costs and enables further refinement of the measurement results.
Preferably, the whole transmission line is divided into a plurality of sections, the length of each section is 1.5km, and the medium with the length L and the length L of less than 0.75km is selected to be introduced into the first end and the last end of each section. In practice, only a medium with a length of about 3m is needed to reflect the heating condition of a whole section of transmission line.
Preferably, the medium is sulfur hexafluoride gas or water. The sulfur hexafluoride gas has good insulating property and is more suitable for detecting high-voltage transmission lines.
Preferably, the step B4. specifically includes
B401. According to calculation typeCalculating the heat dissipation area as S 2 Transmission line heat dissipation efficiency Vi, c 1 To the specific heat capacity of the medium, m 1 Is the medium quality, S 1 Delta T is the variation of the temperature of the medium in time T, which is the surface area of the medium container;
B402. experiment shows that specific heat c of cable inner core 2 Calculating the current heat dissipation efficiency V of the power transmission line i Under the condition, the temperature change rate T of self-heating of the line is not considered 1 ；
B403. Under the open air environment, the ratio of the temperature change quantity of the cable inner core material and the medium with the same temperature after the time T is tested to obtain the temperature change rate T of the circuit contrast under the conditions of 0-30 ℃, 31-60 ℃, 61-90 ℃ and 91-120 DEG C 2 ；
B404. Will T 1 And T is 2 And comparing, wherein when the absolute difference value of the two values exceeds a threshold value X, the condition that the environment is bad is indicated, and the staff is required to be warned.
Preferably, when the transmission line includes a plurality of cables, the detection of steps B1 to B6 is performed for each cable to obtain V i (i=number of cables). According to V obtained i Medium heat radiation container and cableThe spatial distance of the center line is weighted to calculate the average heat dissipation efficiency of the one cable.
The invention has the following substantial effects: by establishing the connection between the medium and the cable heat dissipation model, the environmental parameter acquisition step of the test required by the dynamic capacity expansion of the cable is simplified, and the technical problems that the existing power transmission line current-carrying capacity prediction method is complicated in steps and high in detection cost because a plurality of environmental parameters are required to be acquired based on meteorological conditions are solved.
Drawings
Fig. 1 is a schematic diagram of the steps of the first embodiment.
Fig. 2 is a schematic structural view of a medium container according to an embodiment.
In the figure: 1. a first ventilation pipeline, a second ventilation pipeline and a cable.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, the first embodiment includes the following steps:
B1. medium is introduced between the cable inner core and the insulating layer, and the temperature T of the cable inner core is obtained through medium heat exchange Cable with improved cable characteristics ；
B2. Guiding out the medium, heating the medium outside the cable to the T Cable with improved cable characteristics Stopping heating;
B3. standing the heated medium for time t and calculating the average change rate of temperature;
B4. constructing a mathematical model of the heat dissipation efficiency Vi of the power transmission line according to the average change rate of the temperature, the heat dissipation area of the medium, the specific heat capacity of the medium and the specific heat capacity of the cable inner core material obtained in the step B3; step B4. specifically includes
B401. According to calculation typeCalculating the heat dissipation area as S 2 Transmission line heat dissipation efficiency Vi, c 1 To the specific heat capacity of the medium, m 1 Is the medium quality, S 1 Delta T is the variation of the temperature of the medium in time T, which is the surface area of the medium container;
B402. experiment shows that specific heat c of cable inner core 2 Calculating the current heat dissipation efficiency V of the power transmission line i Next, the temperature change rate T1 of the self-heating of the line is not considered;
B403. under the open air environment, the ratio of the temperature change quantity of the cable inner core material and the medium with the same temperature after the time T is tested to obtain the temperature change rate T of the circuit contrast under the conditions of 0-30 ℃, 31-60 ℃, 61-90 ℃ and 91-120 DEG C 2 ；
B404. Will T 1 And T is 2 And comparing, wherein when the absolute difference value of the two values exceeds a threshold value X, the condition that the environment is bad is indicated, and the staff is required to be warned.
B5. According to the heat dissipation efficiency V of the power transmission line i Current cable core temperature T Cable with improved cable characteristics Upper limit T for cable core temperature safety max And calculating the expandable current-carrying capacity delta I.
B6. Dividing a whole transmission line into a plurality of sections, carrying out the steps B1-B5 on each section to obtain a plurality of groups of data of the expandable current-carrying capacity delta I, and selecting the minimum value as a predicted final result.
As shown in fig. 2, the medium container comprises a first ventilation pipeline 1 installed between an insulating layer of a cable 3 and an internal cell, an air pump, a first connecting valve, a thermistor, an air storage bottle, a second connecting valve, a second ventilation pipeline 2 installed in a pipeline carrying the cable 3, a heating resistor wire and a thermistor, wherein the thermistor is installed in the first ventilation pipeline 1, the first connecting valve is connected with the first ventilation pipeline 1 and an environment detection module through the insulating layer of the cable 3, and the air pump is installed at an inlet of the first ventilation pipeline 1. One end of the second ventilation pipeline 2 is connected with the first connecting valve, and the thermistor and the heating resistance wire are both arranged in the second ventilation pipeline 2. The gas storage bottle is filled with sulfur hexafluoride gas, the air pump is connected with the gas storage bottle, one end of the second ventilation pipeline 2 is connected with the first connecting valve, the other end of the second ventilation pipeline is connected with the gas storage bottle through the second connecting valve, and the control end of the first connecting valve and the control end of the second connecting valve are connected with the calculation control module. The calculation control module records after detecting the current temperature of the inner core of the cable 3, and then controls the first connecting valve to open to enable the first ventilating pipeline 1 to be inHigh-temperature gas is led into the second ventilating pipeline 2, then the first connecting valve and the second connecting valve are closed, the heating resistance wire is controlled to heat the gas in the second ventilating pipeline 2 to be the same as the recorded temperature of the inner core of the cable 3, then the heating is stopped, the temperature change is recorded after the time t passes in the pipeline environment bearing the cable 3, then the heat dissipation is calculated according to the relation between the gas energy and the temperature, the heat dissipation rate delta Q/(t.s) of the unit area can be calculated according to the surface area S of the second ventilating pipeline, the heat is substituted into a steel-cored aluminum stranded wire heat-temperature model, and the heat is calculated by Joule law Q=I 2 RT can calculate that the larger the temperature difference between the wire and the surrounding environment is, the faster the heat exchange rate is, so that the safety margin can be reserved by the wire model prediction of the heat dissipation efficiency calculated at the lower temperature for the higher temperature, and the cable compatible current Δi can be calculated according to the set cable safety temperature.
The above embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (5)
1. A dynamic current-carrying capacity prediction method for a power transmission and transformation line based on microenvironment monitoring is characterized by comprising the following steps of B1. Introducing a medium between a cable inner core and an insulating layer, and obtaining the temperature T of the cable inner core through medium heat exchange Cable with improved cable characteristics ；
B2. Guiding out the medium, heating the medium outside the cable to the T Cable with improved cable characteristics Stopping heating;
B3. standing the heated medium for time t and calculating the average change rate of temperature;
B4. constructing heat dissipation efficiency V of the power transmission line according to the average change rate of temperature, the heat dissipation area of the medium, the specific heat capacity of the medium and the specific heat capacity of the cable core material obtained in the step B3 i Is a mathematical model of (a); the step B4. specifically comprises
B401. According to calculation typeCalculating the heat dissipation area as S 2 Is to be transmitted to the power transmission system Circuit powderThermal efficiency V i In c 1 To the specific heat capacity of the medium, m 1 Is the medium quality, S 1 Delta T is the variation of the temperature of the medium in time T, which is the surface area of the medium container;
B402. experiment shows that specific heat c of cable inner core 2 The temperature change rate T of self-heating of the line is not considered under the condition of calculating the heat dissipation efficiency Vi of the current power transmission line 1 ；
B403. Under the open air environment, the ratio of the temperature change quantity of the cable inner core material and the medium with the same temperature after the time T is tested to obtain the temperature change rate T of the circuit contrast under the conditions of 0-30 ℃, 31-60 ℃, 61-90 ℃ and 91-120 DEG C 2 ；
B404. Will T 1 And T is 2 Comparing, when the absolute difference value of the two values exceeds a threshold value X, indicating that the environmental condition is bad, and alarming staff is needed;
B5. according to the heat dissipation efficiency V of the power transmission line i Current cable core temperature T Cable with improved cable characteristics Upper limit T for cable core temperature safety max Calculating the expandable current-carrying capacity delta I;
B6. dividing a whole transmission line into a plurality of sections, carrying out the steps B1-B5 on each section to obtain a plurality of groups of data of the expandable current-carrying capacity delta I, and selecting the minimum value as a predicted final result.
2. The method for predicting dynamic current-carrying capacity of power transmission and transformation lines based on microenvironment monitoring according to claim 1, wherein the length of each section is 1.5km, and medium with the length L of less than 0.75km is selected from the beginning end and the end of each section.
3. The power transmission and transformation line dynamic current-carrying capacity prediction method based on microenvironment monitoring according to claim 1, wherein the method is characterized by comprising the following steps of:
the medium is sulfur hexafluoride gas or water.
4. The power transmission and transformation line dynamic current-carrying capacity prediction method based on microenvironment monitoring according to claim 1, wherein the method is characterized by comprising the following steps of: when the transmission line comprises a plurality of cablesB1-B6 detection is respectively carried out on each cable to obtain V i I=number of cables.
5. The power transmission and transformation line dynamic current-carrying capacity prediction method based on microenvironment monitoring according to claim 4, wherein the method is characterized by comprising the following steps of: according to V obtained i The medium heat dissipation container and the central line of one cable are weighted to calculate the average heat dissipation efficiency of the one cable.
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| EP1890138A1 (en) * | 2006-08-15 | 2008-02-20 | Eidgenössische Technische Hochschule Zürich | Determination of the specific heat capacity |
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| JP2006038631A (en) * | 2004-07-27 | 2006-02-09 | Tokyo Electric Power Co Inc:The | Cable conductor temperature estimation method in consideration of cooling effect, cable conductor temperature estimation system, and cable conductor temperature estimation program |
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