CN113110116B - Intelligent monitoring system for power transmission and transformation circuit microenvironment - Google Patents
Intelligent monitoring system for power transmission and transformation circuit microenvironment Download PDFInfo
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- CN113110116B CN113110116B CN202110238493.2A CN202110238493A CN113110116B CN 113110116 B CN113110116 B CN 113110116B CN 202110238493 A CN202110238493 A CN 202110238493A CN 113110116 B CN113110116 B CN 113110116B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 title claims abstract description 24
- 230000009466 transformation Effects 0.000 title claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000017525 heat dissipation Effects 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000009423 ventilation Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 6
- 229910018503 SF6 Inorganic materials 0.000 claims description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 2
- 238000002329 infrared spectrum Methods 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000012806 monitoring device Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 8
- 239000004020 conductor Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003796 beauty Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides an intelligent monitoring system for a microenvironment of a power transmission and transformation line, which comprises a control center and a monitoring substation, wherein the monitoring substation is provided with one monitoring substation at intervals of a distance L along the power transmission line, the monitoring substation comprises a communication module, a cable detection module, an environment detection module and a calculation control module, the communication module, the cable detection module and the environment detection module are all connected with the calculation control module, the cable detection module detects the current temperature Tw of a cable, the environment detection module detects the environment heat dissipation efficiency vi, the calculation control module calculates the capacity-increasing current delta I of the cable according to Tw and vi, and the control center counts the capacity-increasing current fed back by the monitoring substation and distributes power according to the result. The substantial effects of the invention are as follows: the microenvironment monitoring device is additionally arranged on the underground laid cable, so that the technical problem that the operation environment of the existing power transmission line is difficult to accurately model by data and the technical problem that the operation environment of the underground laid cable is difficult to measure are solved.
Description
Technical Field
The invention relates to the field of dynamic capacity increase of power systems, in particular to an intelligent monitoring system for a microenvironment of a power transmission and transformation line.
Background
Along with the development of urban construction, new district construction is going on rapidly, along with the development construction of new district, city distribution lines network needs supporting construction to satisfy the needs of urban construction development, distribution lines are by aerial line and cable run two kinds, and aerial line erects aloft, fixes on the iron tower with insulator chain, uses the air as the insulation. The advantages are less investment, short construction period, but less lines can be erected on the same path, which affects the total power supply capacity and the city planning and beauty, more one-time investment of the cable lines, and longer construction period than the overhead lines, but the multi-loop cable channel can be built on the same path at one time, which saves land, improves the total power supply capacity, and does not affect the city landscape, so that more and more cable lines are adopted in the city construction, especially in the places where the line path is limited, the superiority of the cable lines can be better reflected, the cable laying modes are many, such as direct-buried laying, pipe-through laying, cable trench laying and the like, the direct-buried laying cables are easy to be damaged by external force, the laying number is less, the cable trench laying can be built into multiple paths at one time, but the investment is relatively high, the pipe-through laying can be built into multiple cable channels at one time, and the investment is lower than the cable trench, and the cable trench is more suitable for urban distribution network lines.
In fact, a large margin is often left in the operation of the power transmission line, and the margin can be changed at any time along with the difference of the operation environment of the power transmission line (such as the comprehensive parameters of ambient temperature, humidity, wind power, illumination and the like). On the basis of comprehensively considering environmental parameters, data such as scheduling real-time monitoring and the like are utilized to perform operation monitoring, dynamic analysis, tracking and alarming on the line needing energy expansion operation, and the line, the scheduling and other personnel can refer to the line, the operation mode is reasonably arranged, faults are conveniently processed, the transmission capacity is improved to the maximum extent, and the purpose of dynamic capacity increase of the power transmission line is achieved. In the prior art, the technical problem that the operating environment of the power transmission line is difficult to accurately model in a datamation mode 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, which relate to the technical field of meteorological model prediction and solve the technical problems that the traditional meteorological prediction method has poor interference resistance and is easy to be interfered by data. However, the invention carries out prediction based on meteorological data above the ground, does not consider the condition of underground cable laying, and has the problem of insufficient accuracy.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem that the operation environment of the existing power transmission line is difficult to realize accurate data modeling and the technical problem that the operation environment of underground cabling is difficult to measure are solved.
In order to solve the technical problem, the invention provides an intelligent monitoring system for a microenvironment of a power transmission and transformation line, which comprises a control center and a monitoring substation, wherein the monitoring substation is provided with one monitoring substation at intervals of a distance L along the power transmission line, the monitoring substation comprises a communication module, a cable detection module, an environment detection module and a calculation control module, the communication module, the cable detection module and the environment detection module are all connected with the calculation control module, the cable detection module detects the current temperature Tw of a cable, the environment detection module detects the environment heat dissipation efficiency vi, the calculation control module calculates the capacity-increasing current delta I of the cable according to Tw and vi, the control center counts the capacity-increasing current fed back by the monitoring substation and distributes power according to the result, and the communication module is used for information interaction with the control center. The core idea of the invention is that the heat dissipation efficiency of the model with the same temperature as that of the cable inner core wire in the underground pipeline is directly detected, so that the complicated steps of detecting other factors such as wind speed, temperature, air humidity, illumination and the like in the traditional method are eliminated, and the capacity-increasing current of the cable is accurately and efficiently calculated. And arranging a monitoring substation every other distance L to acquire the capacity-increasing current delta I data of the plurality of cables at each section, and performing capacity increase according to the minimum value of the capacity-increasing current delta I data, so that the capacity increase safety of the power transmission line can be ensured.
Preferably, the cable detection module is including installing a ventilation pipeline, air pump, first connecting valve and the thermistor between cable insulation and internal conductor, the thermistor is installed in a ventilation pipeline, first connecting valve sees through cable insulation and connects a ventilation pipeline with environment detection module, the air pump is installed a ventilation pipeline entrance.
Preferably, the environment detection module comprises a second ventilation pipeline, a heating module and a thermistor, wherein the second ventilation pipeline, the heating module and the thermistor are installed in the pipeline for bearing the cable, one end of the second ventilation pipeline is connected with the first connecting valve, and the thermistor and the heating module are installed in the second ventilation pipeline. The calculation control module records after detecting the current temperature of the cable inner core, then controls the connecting valve to open and guide high-temperature gas in the first ventilation pipeline into the second ventilation pipeline, then closes the connecting valve and controls the heating module to heat the gas in the second ventilation pipeline to the temperature same as the recorded temperature of the cable inner core, then stops heating, records temperature change delta M in a pipeline environment bearing the cable after time t, then calculates heat dissipation delta Q according to the relation between gas energy and temperature, calculates the heat dissipation rate delta Q/(t S) of unit area according to the surface area S of the second ventilation pipeline, substitutes the heat dissipation rate delta Q/(t S) into a steel-cored aluminum stranded wire heat-temperature model, and the heat is calculated according to Joule law Q = I 2 The RT can be calculated, the larger the temperature difference between the temperature of the wire and the ambient environment is, the faster the heat exchange rate is, so that a safety margin can be reserved by using the calculated heat dissipation efficiency at a lower temperature for wire model prediction at a higher temperature, and the increasable current delta I of the cable can be calculated according to the set safe temperature of the cable.
Preferably, the sulfur hexafluoride gas storage device further comprises a gas storage bottle and a second connecting valve, the gas storage bottle is filled with sulfur hexafluoride gas, the gas pump is connected with the gas storage bottle, one end of the second vent pipeline is connected with the first connecting valve, the other end of the second vent 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 both connected with the calculation control module.
Preferably, the heating module comprises a direct current power supply and a resistance wire.
Preferably, the environment detection module further comprises an infrared detection unit, the infrared detection unit monitors the distribution situation of the surface temperature of the cable and transmits data to the control calculation unit, the control calculation unit transmits the distribution situation of the surface temperature of the cable to a control center through the communication module, and the control center gives an alarm when the infrared spectrum imaging of a certain section of cable is too bright. Although the first ventilation line flows through the whole cable, the measured temperature is actually the average temperature of the cable, and the accurate detection of the temperature at each point cannot be guaranteed.
The substantial effects of the invention are as follows: the microenvironment monitoring device is additionally arranged on the underground laid cable, so that the technical problem that the running environment of the existing power transmission line is difficult to realize accurate data modeling and the technical problem that the running environment of the underground laid cable is difficult to measure are solved.
Drawings
FIG. 1 is a schematic composition diagram of the first embodiment.
Fig. 2 is a schematic diagram of a monitoring substation according to an embodiment.
In the figure: 1. the system comprises a control center, a communication module 2, a cable detection module 3, an environment detection module 4, a calculation control module 5, a first vent pipeline 6, a gas storage bottle 7, a first connecting valve 8, a second connecting valve 9, a second connecting valve 10, a second vent pipeline 11 and a cable.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment, the monitoring system includes a control center 1 and a monitoring substation, the monitoring substation is provided with one station at intervals of a distance L along a power transmission line, the monitoring substation includes a communication module 2, a cable detection module 3, an environment detection module 4 and a calculation control module 5, the communication module 2, the cable detection module 3 and the environment detection module 4 are all connected to the calculation control module 5, the cable detection module 3 detects a current temperature Tw of a cable 11, the environment detection module 4 detects an environment heat dissipation efficiency vi, the calculation control module 5 calculates a capacity-increasing current Δ I of the cable 11 according to Tw and vi, the control center 1 counts the capacity-increasing current fed back by the monitoring substation and performs power distribution according to a result, and the communication module 2 is configured to interact with the control center 1. Through directly detecting the heat dissipation efficiency of the model with the same temperature as the conductor of the inner core of the cable 11 in the underground pipeline, the complex steps of detecting other factors such as wind speed, temperature, air humidity and illumination in the traditional method are eliminated, and the capacity-increasing current of the cable 11 can be accurately and efficiently calculated. And arranging a monitoring substation at every 1000 meters or at a turning position of the line to acquire the capacity-increasing current delta I data of the plurality of cables 11 at each section, and performing capacity increase according to the minimum value of the capacity-increasing current delta I data, so that the capacity increase safety of the power transmission line can be ensured.
As shown in fig. 2, the cable detection module 3 includes a first air passage 6 installed between an insulating layer of a cable 11 and an internal conductor, an air pump, a first connection valve 8, a thermistor, an air cylinder 7 and a second connection valve 9, the thermistor is installed in the first air passage 6, the first connection valve 8 penetrates through the insulating layer of the cable 11 to connect the first air passage 6 with the environment detection module 4, and the air pump is installed at an inlet of the first air passage 6. The environment detection module 4 comprises a second ventilation pipeline 10, a heating resistance wire and a thermistor which are installed in a pipeline carrying a cable 11, one end of the second ventilation pipeline 10 is connected with the first connecting valve 8, and the thermistor and the heating resistance wire are both installed in the second ventilation pipeline 10. Sulfur hexafluoride gas is filled in the gas storage bottle 7, the gas pump is connected with the gas storage bottle 7, one end of a second vent pipeline 10 is connected with the first connecting valve 8, the other end of the second vent pipeline is connected with the gas storage bottle 7 through the second connecting valve 9, and the control end of the first connecting valve 8 and the control end of the second connecting valve 9 are both connected with the calculation control module 5. The calculation control module 5 records the current temperature of the inner core of the cable 11 after detecting the current temperature, then controls the first connecting valve 8 to open to guide the high-temperature gas in the first vent pipeline 6 into the second vent pipeline 10, and then closes the first connecting valve 8 and the second connecting valve 9 and controls the heating electric machineThe wire is stopped heating the gas in the second vent pipe 10 to the same temperature as the recorded temperature of the inner core of the cable 11, then heating is stopped, in the pipeline environment of the bearing cable 11, the temperature change delta M is recorded after the time t, then the heat dissipation delta Q is calculated according to the relation between the gas energy and the temperature, the heat dissipation rate delta Q/(t S) in unit area can be calculated according to the surface area S of the second vent pipe 10, the heat dissipation rate is substituted into the steel-cored aluminum strand heat-temperature model, and the heat is calculated according to the Joule law Q = I 2 The RT can be calculated, the larger the temperature difference between the temperature of the wire and the ambient environment is, the faster the heat exchange rate is, so that a safety margin can be reserved by using the calculated heat dissipation efficiency at a lower temperature for wire model prediction at a higher temperature, and the increasable current delta I of the cable can be calculated according to the set safe temperature of the cable.
The above embodiment is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the technical scope of the claims.
Claims (3)
1. An intelligent monitoring system for the microenvironment of electric transmission and transformation lines, which is used for monitoring and reasonably distributing the load of the electric transmission lines laid in pipelines, comprises a control center and a monitoring substation, the method is characterized in that: the monitoring substation is arranged along the power transmission line at intervals of a distance L and comprises a communication module, a cable detection module, an environment detection module and a calculation control module, the communication module, the cable detection module and the environment detection module are all connected with the calculation control module, the cable detection module detects the current temperature Tw of the cable, the environment detection module detects the environmental heat dissipation efficiency vi, the calculation control module calculates the cable capacity-increasing current delta I according to Tw and vi, the control center calculates the capacity-increasing current fed back by the monitoring substation and distributes power according to the result, and the communication module is used for information interaction with the control center; the cable detection module comprises a gas pipeline, an air pump, a first connecting valve and a thermistor, wherein the gas pipeline, the air pump, the first connecting valve and the thermistor are arranged between a cable insulating layer and an internal lead, the thermistor is arranged in the gas pipeline, and the first connecting valve is connected with the first connecting valve through the cable insulating layerThe air pump is arranged at the inlet of the first air pipeline; the environment detection module comprises a second ventilation pipeline, a heating module and a thermistor which are arranged in the pipeline for bearing the cable, one end of the second ventilation pipeline is connected with the first connecting valve, and the thermistor and the heating module are both arranged in the second ventilation pipeline; 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 vent pipeline is connected with the first connecting valve, the other end of the second vent 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 both connected with the calculation control module; the method comprises the steps that a calculation control module detects the current temperature of a cable inner core and records the current temperature, a first connecting valve is opened to guide high-temperature gas in a first vent pipeline into a second vent pipeline, the first connecting valve and a second connecting valve are closed, the heating module is controlled to heat the gas in the second vent pipeline to the same temperature as the recorded temperature of the cable inner core, heating is stopped, time t passes in a pipeline environment bearing a cable, temperature change delta M is recorded, and heat dissipation delta Q is calculated according to the relationship between gas energy and temperature; calculating the heat dissipation rate delta Q/(t S) of unit area by the surface area S of the second ventilation pipeline, substituting the heat dissipation rate delta Q/(t S) into a steel-cored aluminum strand heat-temperature model, and calculating the heat dissipation rate delta Q = I according to the Joule law 2 And calculating the heat quantity, and calculating the capacity-increasing current delta I of the cable according to the set safe temperature of the cable.
2. The intelligent power transmission and transformation line microenvironment monitoring system of claim 1, wherein: the heating module comprises a direct current power supply and a resistance wire.
3. The intelligent power transmission and transformation line microenvironment monitoring system of claim 1, wherein: the environment detection module further comprises an infrared detection unit, the infrared detection unit monitors the distribution situation of the surface temperature of the cable and transmits data into the control calculation unit, the control calculation unit transmits the distribution situation of the surface temperature of the cable to the control center through the communication module, and the control center gives an alarm when the infrared spectrum imaging of a certain section of cable is too bright.
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| CN202110238493.2A CN113110116B (en) | 2021-03-04 | 2021-03-04 | Intelligent monitoring system for power transmission and transformation circuit microenvironment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778619A (en) * | 2012-07-11 | 2012-11-14 | 华北电力大学 | Method for detecting maximum current-carrying capacity of transmission conductor of high-voltage transmission line |
| CN203858902U (en) * | 2014-05-19 | 2014-10-01 | 广东威恒输变电工程有限公司 | Cooling cable |
| CN206132116U (en) * | 2016-09-13 | 2017-04-26 | 上海嘉柒网络科技有限公司 | Tunnel extra -high -tension cable life state supervisory systems |
| CN208334251U (en) * | 2018-03-26 | 2019-01-04 | 深圳带路科技有限公司 | A kind of heat dissipation index measurement device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707888A (en) * | 2020-05-27 | 2020-09-25 | 许继集团有限公司 | Dynamic prediction method for temperature, current-carrying capacity and tolerance time of cable conductor |
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- 2021-03-04 CN CN202110238493.2A patent/CN113110116B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778619A (en) * | 2012-07-11 | 2012-11-14 | 华北电力大学 | Method for detecting maximum current-carrying capacity of transmission conductor of high-voltage transmission line |
| CN203858902U (en) * | 2014-05-19 | 2014-10-01 | 广东威恒输变电工程有限公司 | Cooling cable |
| CN206132116U (en) * | 2016-09-13 | 2017-04-26 | 上海嘉柒网络科技有限公司 | Tunnel extra -high -tension cable life state supervisory systems |
| CN208334251U (en) * | 2018-03-26 | 2019-01-04 | 深圳带路科技有限公司 | A kind of heat dissipation index measurement device |
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