CN113111485A - Power transmission and transformation line dynamic capacity increasing method based on multiple data sources - Google Patents

Power transmission and transformation line dynamic capacity increasing method based on multiple data sources Download PDF

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Publication number
CN113111485A
CN113111485A CN202110240191.9A CN202110240191A CN113111485A CN 113111485 A CN113111485 A CN 113111485A CN 202110240191 A CN202110240191 A CN 202110240191A CN 113111485 A CN113111485 A CN 113111485A
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temperature
cable
liquid
temperature sensor
outer sheath
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CN113111485B (en
Inventor
段军
殷伟斌
梁樑
丁一岷
陈鼎
周旻
顾曦华
范明
魏泽民
钱伟杰
曹阳
李志�
余绍峰
高一波
胡景博
唐锦江
郭创新
丁一
叶承晋
方攸同
郭一凡
金祝飞
邢旭亮
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Zhejiang University ZJU
Zhejiang Huadian Equipment Inspection Institute
Jiaxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Zhejiang University ZJU
Zhejiang Huadian Equipment Inspection Institute
Jiaxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

The invention relates to the technical field of electric power, in particular to a dynamic capacity increasing method for a power transmission and transformation line based on multiple data sources, which comprises the following steps: A) constructing a test device, and obtaining a function F of the temperature of the cable conductor to the outer sheath temperature, the ambient temperature and humidity, the wind speed and the wind direction; B) obtaining a function G of the cable heat dissipation power to the outer sheath temperature, the environment temperature and humidity, the wind speed and the wind direction; D) construction of equation PHeat dissipationP _ load × R; E) looking for the maximum P _ load _ max for P _ load, P _ load _ max is used as the dynamic capacity increase of the target cable. The substantial effects of the invention are as follows: obtaining a function F of the temperature of the cable conductor to the temperature of the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction, and being the standard of the temperature of the cable conductorThe reliable mathematical model is provided by the accurate monitoring, the upper load limit of the cable can be directly obtained according to the current environment, and a dynamic capacity-increasing result is provided.

Description

Power transmission and transformation line dynamic capacity increasing method based on multiple data sources
Technical Field
The invention relates to the technical field of electric power, in particular to a dynamic capacity increasing method for a power transmission and transformation line based on multiple data sources.
Background
The transmission and transformation line based on multiple data sources is complex in passing environment, only partial sections of the transmission and transformation line based on multiple data sources are monitored at present, and the operation condition of the whole transmission and transformation line based on multiple data sources cannot be mastered. When the line is designed, a higher margin is usually reserved in consideration of uncertainty of a passing environment of the power transmission and transformation line based on multiple data sources, so that certain waste exists in the capacity of the power transmission and transformation line based on the multiple data sources. The dynamic capacity increasing technology is characterized in that an online monitoring device is installed on a transmission and transformation line based on multiple data sources to monitor the state of a conductor and meteorological conditions, the maximum allowable current-carrying capacity of the conductor is calculated according to a mathematical model on the premise of not breaking through the regulation of the existing technical regulations, the objective implicit capacity of the line is fully utilized, and the transmission capacity of the transmission and transformation line based on the multiple data sources is improved. For example, chinese patent CN104330659B, published 2017, 2.15, a quasi-dynamic capacity increasing method based on a cable heat transfer model, which is used for capacity increasing of cables inside pipes, includes the following steps: 1) according to the working condition of the whole cable, a data acquisition system is established in the bottleneck cable section for carrying out data measurement on the same day; 2) according to the data of the bottleneck cable section measured by the data acquisition system on the same day, establishing and updating a cable heat transfer model of the bottleneck cable section on the next day by taking the day as a unit; 3) and estimating the current-carrying capacity of the cable to be subjected to capacity increase in the bottleneck cable section on the next day according to the cable heat transfer model of the bottleneck cable section on the next day, so as to realize the capacity increase of the cable. However, the method can only update the cable heat dissipation model of the next day, estimate the current-carrying capacity of the next day, cannot dynamically increase capacity in real time, and has poor capacity increase effect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem of lack of dynamic compatibilization technology at present. The method can dynamically increase capacity according to the operation environment of the cable, provides capacity increase capacity and can ensure the safety of the cable.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a dynamic capacity increasing method for power transmission and transformation lines based on multiple data sources comprises the following steps: A) constructing a test device, and obtaining functions F and T of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction under the laboratory conditionConductor＝F(TOuter sheath,Te,He,We,δe) Wherein T isOuter sheathTemperature of the outer sheath, TeIs ambient temperature, HeIs the ambient humidity, WeIs the wind speed, deltaeIs the included angle between the wind direction and the cable; B) obtaining functions G, P of cable heat dissipation power to outer sheath temperature, environment temperature and humidity, wind speed and wind direction under laboratory conditionsHeat dissipation＝G(TOuter sheath,Te,He,We,δe) (ii) a C) Arranging temperature monitoring equipment and environment monitoring equipment along a target cable, periodically acquiring the temperature of the outer sheath of the target cable, the temperature and the humidity of the environment, the wind speed and the wind direction, and acquiring the conductor temperature T of the target cable according to the monitoring data and the function F acquired in the step A)ConductorIf the conductor temperature TConductorIf k multiplied by T _ max is exceeded, an alarm is givenWhere k is the margin coefficient, k<1, T _ max is the upper limit value of the conductor temperature; D) obtaining the current equivalent resistance R of the target cable in unit length, substituting the obtained target cable outer sheath temperature, environment temperature and humidity, wind speed and wind direction into a function G, and constructing an equation PHeat dissipationP _ load × R, where P _ load is the target cable load; E) finding TOuter sheathSuch that P _ load takes the maximum value P _ load _ max and T is satisfiedConductor<k × T _ max, then P _ load _ max serves as the dynamic capacity increase of the target cable. The method has the advantages that the function F of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction is obtained under the laboratory condition, a reliable mathematical model can be provided for accurate monitoring of the temperature of the cable conductor, the upper limit of the load of the cable can be directly obtained according to the current environment by obtaining the calculation function of the heat dissipation power of the cable, the upper limit of the capacity increasing of the cable can be quickly obtained, and a dynamic capacity increasing result is provided.
Preferably, in the step a), the constructed test device comprises an environment simulation box, a test cable heating device and a test cable temperature detection device, wherein the test cable is placed in the environment simulation box, the cable heating device is connected with the test cable, the cable heating device enables the test cable to have controllable temperature, and the cable temperature detection device detects the temperature of the outer sheath of the test cable; the environmental simulation case includes box, fan, circulation wind channel, air heater, air-cooler, humidifier, dehumidifier, temperature and humidity sensor, anemograph and control module, the box is airtight, the both ends of box are connected respectively to circulation wind channel both ends, fan, air heater with, air-cooler, humidifier and dehumidifier are all installed in the circulation wind channel, temperature and humidity sensor installs in the box, detects the humiture of the internal air of box, the anemograph is installed in the box, the anemograph detects the velocity of flow of the internal air of box, fan, circulation wind channel, air heater, air-cooler, humidifier, dehumidifier, temperature and humidity sensor and anemograph all are connected with control module. The environment simulation box can simulate the environment humiture and the wind speed, and provides a test environment close to reality.
Preferably, the test cable heating device comprises an injection head, an injection pipe, a liquid return head, a liquid return pipe, a liquid tank, an injection pump, a flow rate meter, a heater, an in-tank temperature sensor, an inlet temperature sensor, an outlet temperature sensor and a controller, the cable temperature detection device comprises a plurality of sheath temperature sensors, the test cable has a preset length L, two ends of the test cable are exposed, a through hole is processed in the middle of a conductor of the test cable, one end of the injection pipe is connected with the injection pump, the injection pump is connected with the liquid tank, the injection head communicates the injection pipe with the through hole at one end of the cable conductor, the liquid return head communicates the liquid return pipe with the through hole at the other end of the cable conductor, the liquid return pipe is connected with the liquid tank, the flow rate meter is installed between the injection head and the test cable to detect the flow rate of liquid in the test cable, the heater is installed in the liquid, the temperature sensor is installed in the liquid tank, detects the temperature of liquid in the liquid tank, entry temperature sensor installs at annotating liquid overhead, detects the temperature of annotating liquid overhead liquid, exit temperature sensor installs at returning liquid overhead, detects the temperature of liquid in the liquid return overhead, and a plurality of sheath temperature sensor installs on lavatory cable oversheath, detects the temperature on the oversheath, and test cable both ends all are equipped with sheath temperature sensor, annotate liquid pump, heater, incasement temperature sensor, entry temperature sensor, exit temperature sensor and a plurality of sheath temperature sensor and all be connected with the controller. The liquid heated to the preset temperature is used for enabling the conductor temperature of the cable to reach the preset temperature, the conductor does not need to be heated through large current, energy is saved, and safety is improved. And (3) introducing the liquid heated to the preset temperature into the test cable, maintaining for a period of time, so that the temperature of the cable can reach a stable state, detecting the temperature at the moment, and obtaining the heat dissipation condition of the test cable, thereby obtaining the heat dissipation model of the cable. Through the velocity meter and the feedback control to the liquid injection pump, the velocity of flow of liquid can be stabilized, and the interference and the error of the test are reduced.
Preferably, the cable heating device further comprises a temperature compensator, the temperature compensator is installed on the liquid injection pipe, the temperature compensator comprises a shell, a compensation cylinder, a sliding plug, a compensation spring, a liquid supplementing pipe, a locking head, a front temperature sensor and a rear temperature sensor, the shell is installed on the liquid injection pipe, the compensation cylinder is installed in the shell, one end of the compensation cylinder is open and the other end of the compensation cylinder is closed, the open end of the compensation cylinder is communicated with the liquid injection pipe, the sliding plug is installed in the compensation cylinder, the sliding plug is abutted to the inner wall of the compensation cylinder, one end of the compensation spring is fixedly connected with the sliding plug, the other end of the compensation spring is fixedly connected with the closed end of the compensation cylinder, one end of the liquid supplementing pipe is communicated with the part of the cylinder close to the closed end, the other end of the liquid supplementing pipe is communicated with the liquid injection pipe, the locking, the compensating spring both ends are passed through the wire and are connected with electronic switch K1 and power VT1, leading temperature sensor installs on annotating the liquid pipe, leading temperature sensor is located one side that a compensation section of thick bamboo is close to the infusion pump, front end temperature sensor installs the position that a compensation section of thick bamboo is close to annotating the liquid pipe, rear end temperature sensor installs the position that a compensation section of thick bamboo is close to the fluid infusion pipe, electronic switch K1 control end, locking head, leading temperature sensor, front end temperature sensor and rear end temperature sensor all are connected with the controller. The temperature compensator can make the liquid temperature more uniform, and the accuracy of the cable heat dissipation model is improved. The liquid in the liquid tank is heated to reach the preset temperature, and the liquid at each part cannot be heated by the heater, so that the temperature of the liquid is unevenly distributed. But the temperature difference is not large, and the temperature compensator can compensate the non-uniformity of the temperature distribution. The spring is electrified to contract, and the contraction quantity of the spring is related to the magnitude of the current passing through the spring. Through the closed duty cycle of PWM mode control electronic switch K1, can control the electric current size that flows through compensating spring, and then control compensating spring's shrinkage, front end temperature sensor position is low temperature liquid, and rear end temperature sensor position is high temperature liquid, and when compensating spring shrinkage increased, can impress high temperature liquid and annotate the liquid pipe, otherwise, when compensating spring shrinkage reduced, can impress low temperature liquid and annotate the liquid pipe, and then the compensation annotates the distribution inhomogeneity of intraductal temperature of liquid. The locking head is locked to enable the sliding plug not to move, the locking head can use an electromagnetic lock, an electric push rod and the like, then the compensation spring is electrified to enable the compensation spring to generate heat, and the effect of heating liquid at the position of the rear-end temperature sensor is achieved.
Preferably, the locking head comprises a locking pipe, a locking block and a locking spring, the locking pipe is mounted on the compensation cylinder, the locking block is connected with the locking pipe in a sliding mode, one end of the locking spring is fixedly connected with the locking block, the other end of the locking spring is fixedly connected with the locking pipe, the compensation cylinder is provided with a hole for the locking block to pass through, the position of the locking block corresponds to that of the sliding plug, two ends of the locking spring are connected with the electronic switch K2 and the power supply VT2 through conducting wires, and the control end of the electronic switch K2 is connected with the controller. The duty ratio of the electronic switch K1 closed is controlled to be increased in a PWM mode, so that the current passing through the locking spring is increased, the locking spring contracts, the locking head is unlocked at the moment, the sliding plug can move, and on the contrary, when the duty ratio of the electronic switch K1 closed is reduced, the locking spring extends, and the sliding plug is locked and cannot move.
Preferably, in the step a), the method for obtaining the function F of the temperature of the cable conductor to the temperature of the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction includes: A1) heating the liquid in the liquid tank by using a heater to enable the temperature of the liquid to reach a value T1, simulating the temperature of a conductor of the cable, starting a liquid injection pump, injecting the liquid with the temperature of T1 into the test cable, and monitoring the monitoring values of an inlet temperature sensor, an outlet temperature sensor and a plurality of sheath temperature sensors; A2) when the value of the sheath temperature sensor is basically stable, the temperature of the test cable is shown to reach a stable state, the value of the sheath temperature sensor at the position of the test cable close to one end of the liquid injection head is read and recorded as the head end temperature T1_ s of the outer sheath, the value of the sheath temperature sensor at the position of the test cable close to one end of the liquid return head is read and recorded as the tail end temperature T1_ e of the outer sheath, the monitoring value V of the current meter is read, the environmental temperature and humidity and the wind speed are read by the environmental simulation box, the placement direction of the test cable is changedeThe size of the environment simulation box allows the test cable to be placed in any direction; A3) the conductor temperature T1, the head end temperature T1_ s of the outer sheath, the tail end temperature T1_ e of the outer sheath, the flow velocity V, the ambient temperature and humidity HT, the wind speed W and the wind direction deltaeObtaining the temperature of the outer sheath of the cable as a set of simulation data when the function F is obtainedThe outer jacket head end temperature T1_ s is used.
Preferably, in the step B), the method for obtaining the function G of the cable heat dissipation power to the outer sheath temperature, the ambient temperature and humidity, the wind speed and the wind direction includes: B1) obtaining the temperature T1_ S of the head end of the outer sheath, the temperature T1_ e of the tail end of the outer sheath, the flow velocity V, the length L of the test cable, the cross section area S of the through hole of the test cable and the liquid density rho under the current simulation environmentLiquid for treating urinary tract infectionAnd liquid specific heat capacity cLiquid for treating urinary tract infection(ii) a B2) Calculating the heat dissipation power P of the unit-length target cable of the test cable under the current environment EtHeat dissipation，PHeat dissipation＝cLiquid for treating urinary tract infection·ρLiquid for treating urinary tract infection·S·V·(T1s-T1_ e); B3) will PHeat dissipationAssociating with the temperature of the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction as sample data; B4) changing the simulation environment in the step B1), and repeating the steps B1) to B3) to obtain enough sample data; B5) using the sample data obtained in step B4), building and training a neural network model, which is used as function G.
The substantial effects of the invention are as follows: the method has the advantages that the function F of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction is obtained, a reliable mathematical model can be provided for accurate monitoring of the temperature of the cable conductor, the upper limit of the load of the cable can be directly obtained according to the current environment by obtaining the calculation function of the heat dissipation power of the cable, the upper limit of the capacity increase of the cable can be quickly obtained, and a dynamic capacity increase result is provided.
Drawings
Fig. 1 is a flowchart of a dynamic compatibilization method according to an embodiment.
Fig. 2 is a schematic structural diagram of a cable heat dissipation simulation device according to an embodiment.
FIG. 3 is a schematic view of a test cable according to an embodiment.
FIG. 4 is a schematic structural diagram of a second temperature compensator according to an embodiment.
Wherein: 100. the test cable comprises a test cable body, 101, a sheath layer, 102, an armor layer, 103, an inner lining layer, 104, a conductor, 105, an insulating layer, 200, a pipeline, 301, a liquid injection head, 302, a liquid injection pipe, 303, a liquid return pipe, 400, a temperature compensator, 401, a compensation spring, 402, a sliding plug, 403, a compensation cylinder, 404, a locking block, 405, a locking spring, 406, a locking pipe, 407, a liquid supplementing pipe, 408 and a shell.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
A dynamic capacity increasing method for power transmission and transformation lines based on multiple data sources, as shown in fig. 1, includes the following steps: A) constructing a test device, and obtaining functions F and T of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction under the laboratory conditionConductor＝F(TOuter sheath,Te,He,We,δe) Wherein T isOuter sheathTemperature of the outer sheath, TeIs ambient temperature, HeIs the ambient humidity, WeIs the wind speed, deltaeIs the included angle between the wind direction and the cable; B) obtaining functions G, P of cable heat dissipation power to outer sheath temperature, environment temperature and humidity, wind speed and wind direction under laboratory conditionsHeat dissipation＝G(TOuter sheath,Te,He,We,δe) (ii) a C) Arranging temperature monitoring equipment and environment monitoring equipment along a target cable, periodically acquiring the temperature of the outer sheath of the target cable, the temperature and the humidity of the environment, the wind speed and the wind direction, and acquiring the conductor temperature T of the target cable according to the monitoring data and the function F acquired in the step A)ConductorIf the conductor temperature TConductorIf k is more than k multiplied by T _ max, an alarm is sent out, wherein k is a margin coefficient, and k is<1, T _ max is the upper limit value of the conductor temperature; D) obtaining the current equivalent resistance R of the target cable in unit length, substituting the obtained target cable outer sheath temperature, environment temperature and humidity, wind speed and wind direction into a function G, and constructing an equation PHeat dissipationP _ load × R, where P _ load is the target cable load; E) finding TOuter sheathSuch that P _ load takes the maximum value P _ load _ max and T is satisfiedConductor<k × T _ max, then P _ load _ max serves as the dynamic capacity increase of the target cable. The method has the advantages that the function F of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction is obtained under the laboratory condition, a reliable mathematical model can be provided for the accurate monitoring of the temperature of the cable conductor, and the calculation of the heat dissipation power of the cable is obtainedAnd the function can directly obtain the upper limit of the load of the cable according to the current environment, quickly obtain the upper limit of the capacity increase of the cable and provide a dynamic capacity increase result.
As shown in fig. 2, in step a), the constructed test device includes an environment simulation box, a test cable 100 heating device, and a test cable 100 temperature detection device, the test cable 100 is placed in the environment simulation box, the test cable 100 sequentially includes, from outside to inside, a sheath layer 101, an armor layer 102, an inner liner layer 103, and a plurality of conductors 104 covered with an insulating layer 105, the cable heating device is connected to the test cable 100, the cable heating device enables the test cable 100 to have a controllable temperature, and the cable temperature detection device detects the outer sheath temperature of the test cable 100; the environmental simulation case includes the box, the fan, the circulation wind channel, the air heater, the air-cooler, the humidifier, the dehumidifier, temperature and humidity sensor, anemograph and control module, the box is airtight, the both ends of box are connected respectively to circulation wind channel both ends, the fan, the air heater with, the air-cooler, humidifier and dehumidifier are all installed in the circulation wind channel, temperature and humidity sensor installs in the box, detect the humiture of the internal air of box, the anemograph is installed in the box, the anemograph detects the velocity of flow of the internal air of box, the fan, the circulation wind channel, the air heater, the air cooler, the humidifier, the dehumidifier, temperature and humidity sensor and anemograph all are connected with control module. The environment simulation box can simulate the environment humiture and the wind speed, and provides a test environment close to reality. The cables comprise overhead cables and through-well cables, the through-well cables comprise a plurality of parallel cables positioned in the cable pipeline 200, and the temperature monitors arranged along the target cables comprise infrared temperature monitors and thermocouple temperature monitors; the infrared temperature monitor is arranged on the tower and comprises an infrared image temperature measuring unit and a communication module, the infrared image temperature measuring unit shoots infrared images of cables on two sides of the tower and converts the infrared images into a temperature distribution diagram, and the infrared image temperature measuring unit is connected with the communication module; the thermocouple temperature monitor comprises a control unit, a plurality of thermocouple temperature detection units and a communication device, wherein the plurality of thermocouple temperature detection units are arranged along a target cable and used for detecting the temperature of the outer sheath of the target cable, the plurality of thermocouple temperature detection units are connected with the control unit, and the control unit is connected with the communication device.
As shown in fig. 3, the heating device of the test cable 100 comprises a liquid injection head 301, a liquid injection pipe 302, a liquid return head, a liquid return pipe 303, a liquid tank, a liquid injection pump, a flow rate meter, a heater, an in-tank temperature sensor, an inlet temperature sensor, an outlet temperature sensor and a controller, the cable temperature detection device comprises a plurality of sheath temperature sensors, the test cable 100 has a preset length L, two ends of the test cable 100 are exposed, a through hole is processed in the middle of a conductor of the test cable 100, one end of the liquid injection pipe 302 is connected with the liquid injection pump, the liquid injection pump is connected with the liquid tank, the liquid injection head 301 connects the liquid injection pipe 302 with the through hole at one end of the cable conductor, the liquid return head connects the liquid return pipe 303 with the through hole at the other end of the cable conductor, the liquid return pipe 303 is connected with the liquid tank, the flow rate meter is installed between the liquid injection head, the incasement temperature sensor installs in the liquid incasement, detect the temperature of liquid incasement liquid, entry temperature sensor installs on annotating liquid head 301, detect the temperature of annotating liquid head 301 interior liquid, exit temperature sensor installs at returning liquid overhead, detect the temperature of liquid in the liquid head that returns, a plurality of sheath temperature sensor installs on lavatory cable oversheath, detect the temperature on the oversheath, test cable 100 both ends all are equipped with sheath temperature sensor, the infusion pump, a heater, the incasement temperature sensor, entry temperature sensor, exit temperature sensor and a plurality of sheath temperature sensor all are connected with the controller. The liquid heated to the preset temperature is used for enabling the conductor temperature of the cable to reach the preset temperature, the conductor does not need to be heated through large current, energy is saved, and safety is improved. And (3) introducing the liquid heated to the preset temperature into the test cable 100, and maintaining for a period of time, so that the temperature of the cable can reach a stable state, and detecting the temperature at the moment can obtain the heat dissipation condition of the test cable 100, thereby obtaining the heat dissipation model of the cable. Through the velocity meter and the feedback control to the liquid injection pump, the velocity of flow of liquid can be stabilized, and the interference and the error of the test are reduced.
The cable heating device further comprises a temperature compensator 400, the temperature compensator 400 is mounted on the liquid injection pipe 302, as shown in fig. 4, the temperature compensator 400 comprises a shell 408, a compensation cylinder 403, a sliding plug 402, a compensation spring 401, a liquid supplementing pipe 407, a locking head, a front temperature sensor and a rear temperature sensor, the shell 408 is mounted on the liquid injection pipe 302, the compensation cylinder 403 is mounted in the shell 408, one end of the compensation cylinder 403 is open and the other end of the compensation cylinder 403 is closed, the open end of the compensation cylinder 403 is communicated with the liquid injection pipe 302, the sliding plug 402 is mounted in the compensation cylinder 403, the sliding plug 402 is abutted against the inner wall of the compensation cylinder 403, one end of the compensation spring 401 is fixedly connected with the sliding plug 402, the other end of the compensation spring 401 is fixedly connected with the closed end of the compensation cylinder 403, one end of the liquid supplementing pipe 407 is communicated with the part of the cylinder close to the, the locking head is used for locking and unlocking the sliding plug 402, two ends of the compensating spring 401 are connected with an electronic switch K1 and a power supply VT1 through leads, the front temperature sensor is installed on the liquid injection pipe 302 and is positioned at one side of the compensating cylinder 403 close to the liquid injection pump, the front temperature sensor is installed at the position of the compensating cylinder 403 close to the liquid injection pipe 302, the rear temperature sensor is installed at the position of the compensating cylinder 403 close to the liquid supplementing pipe 407, and the electronic switch K1 control end, the locking head, the front temperature sensor and the rear temperature sensor are all connected with the controller. The temperature compensator 400 can make the liquid temperature more uniform, and the accuracy of the cable heat dissipation model is improved. The liquid in the liquid tank is heated to reach the preset temperature, and the liquid at each part cannot be heated by the heater, so that the temperature of the liquid is unevenly distributed. However, the temperature difference is not large, and the temperature compensator 400 can compensate for the unevenness of the temperature distribution. The spring is electrified to contract, and the contraction quantity of the spring is related to the magnitude of the current passing through the spring. Through the closed duty cycle of PWM mode control electronic switch K1, can control the electric current size that flows through compensating spring 401, and then control compensating spring 401's shrinkage, front end temperature sensor position is low temperature liquid, rear end temperature sensor position is high temperature liquid, when compensating spring 401 shrinkage increases, can impress high temperature liquid and annotate liquid pipe 302, otherwise, when compensating spring 401 shrinkage reduces, can impress low temperature liquid and annotate liquid pipe 302, and then the distribution inhomogeneity of temperature in the compensation notes liquid pipe 302. The locking head is locked to enable the sliding plug 402 not to move, the locking head can use an electromagnetic lock, an electric push rod and the like, then the compensation spring 401 is electrified to enable the compensation spring 401 to generate heat, and the effect of heating liquid at the position of the rear-end temperature sensor is achieved.
The locking head comprises a locking pipe 406, a locking block 404 and a locking spring 405, the locking pipe 406 is mounted on a compensation cylinder 403, the locking block 404 is connected with the locking pipe 406 in a sliding mode, one end of the locking spring 405 is fixedly connected with the locking block 404, the other end of the locking spring 405 is fixedly connected with the locking pipe 406, a hole for the locking block 404 to pass through is formed in the compensation cylinder 403, the position of the locking block 404 corresponds to that of the sliding plug 402, two ends of the locking spring 405 are connected with an electronic switch K2 and a power supply VT2 through conducting wires, and the control end of the electronic switch K2 is connected with a controller. The duty ratio of the electronic switch K1 closed is controlled to be increased in a PWM mode, so that the current passing through the locking spring 405 is increased, the locking spring 405 contracts, the locking head is unlocked at the moment, the sliding plug 402 can move, and conversely, when the duty ratio of the electronic switch K1 closed is reduced, the locking spring 405 extends, and the sliding plug 402 is locked and cannot move.
In the step A), the method for obtaining the function F of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction comprises the following steps: A1) heating the liquid in the liquid tank by using a heater to enable the temperature of the liquid to reach a value T1, simulating the temperature of a conductor of the cable, starting a liquid injection pump, injecting the liquid with the temperature of T1 into the test cable 100, and monitoring the monitoring values of an inlet temperature sensor, an outlet temperature sensor and a plurality of sheath temperature sensors; A2) when the value of the sheath temperature sensor is basically stable, the temperature of the test cable 100 is shown to reach a stable state, at the moment, the value of the sheath temperature sensor at the position, close to one end of the liquid injection head 301, of the test cable 100 is read and recorded as the head end temperature T1_ s of the outer sheath, the value of the sheath temperature sensor at the position, close to one end of the liquid return head, of the test cable 100 is read and recorded as the tail end temperature T1_ e of the outer sheath, the monitoring value V of the current meter is read, the environmental temperature, humidity and wind speed are read by an environmental simulation box, the placement direction ofeThe size of the environmental simulation box allows the test cable 100 to be placed in any direction; A3) the conductor temperature T1 and the outer sheath head end temperature T1_ sTemperature T1_ e at tail end of outer sheath, flow speed V, ambient temperature and humidity HT, wind speed W and wind direction deltaeAs a set of simulation data, the cable jacket temperature when the function F is obtained is the jacket head end temperature T1_ s.
In the step B), the method for obtaining the function G of the cable heat dissipation power to the outer sheath temperature, the environment temperature and humidity, the wind speed and the wind direction comprises the following steps: B1) obtaining the temperature T1_ S of the head end of the outer sheath, the temperature T1_ e of the tail end of the outer sheath, the flow velocity V, the length L of the test cable 100, the cross section area S of the through hole of the test cable 100 and the liquid density rho under the current simulation environmentLiquid for treating urinary tract infectionAnd liquid specific heat capacity cLiquid for treating urinary tract infection(ii) a B2) Calculating the heat dissipation power P of the unit-length target cable of the test cable 100 in the current environment EtHeat dissipation，PHeat dissipation＝cLiquid for treating urinary tract infection·ρLiquid for treating urinary tract infection·S·V·(T1s-T1_ e); B3) will PHeat dissipationAssociating with the temperature of the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction as sample data; B4) changing the simulation environment in the step B1), and repeating the steps B1) to B3) to obtain enough sample data; B5) using the sample data obtained in step B4), a neural network model is built and trained, the neural network model being used as the function G.
The beneficial technical effects of this embodiment are: the method has the advantages that the function F of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction is obtained, a reliable mathematical model can be provided for accurate monitoring of the temperature of the cable conductor, the upper limit of the load of the cable can be directly obtained according to the current environment by obtaining the calculation function of the heat dissipation power of the cable, the upper limit of the capacity increase of the cable can be quickly obtained, and a dynamic capacity increase result is provided.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.

Claims (7)

1. A dynamic capacity increasing method for power transmission and transformation lines based on multiple data sources is characterized in that,
the method comprises the following steps:
A) constructing a test device to obtain the temperature of the cable conductor to the outsideFunction F, T of sheath temperature, environment humiture, wind speed and wind directionConductor＝F(TOuter sheath,Te,He,We,δe) Wherein T isOuter sheathTemperature of the outer sheath, TeIs ambient temperature, HeIs the ambient humidity, WeIs the wind speed, deltaeIs the included angle between the wind direction and the cable;
B) obtaining functions G, P of cable heat dissipation power to outer sheath temperature, environment temperature and humidity, wind speed and wind directionHeat dissipation＝G(TOuter sheath,Te,He,We,δe)；
C) Arranging temperature monitoring equipment and environment monitoring equipment along a target cable, periodically acquiring the temperature of the outer sheath of the target cable, the temperature and the humidity of the environment, the wind speed and the wind direction, and acquiring the conductor temperature T of the target cable according to the monitoring data and the function F acquired in the step A)ConductorIf the conductor temperature TConductorIf k is more than k multiplied by T _ max, an alarm is sent out, wherein k is a margin coefficient, and k is<1, T _ max is the upper limit value of the conductor temperature;
D) obtaining the current equivalent resistance R of the target cable in unit length, substituting the obtained target cable outer sheath temperature, environment temperature and humidity, wind speed and wind direction into a function G, and constructing an equation PHeat dissipationP _ load × R, where P _ load is the target cable load;
E) finding TOuter sheathSuch that P _ load takes the maximum value P _ load _ max and T is satisfiedConductor<k × T _ max, then P _ load _ max serves as the dynamic capacity increase of the target cable.
2. The method for dynamic capacity increase of transmission and transformation lines based on multiple data sources as claimed in claim 1,
in the step A), the constructed test device comprises an environment simulation box, a test cable heating device and a test cable temperature detection device, wherein the test cable is placed in the environment simulation box, the cable heating device is connected with the test cable, the cable heating device enables the test cable to have controllable temperature, and the cable temperature detection device detects the temperature of the outer sheath of the test cable;
the environmental simulation case includes box, fan, circulation wind channel, air heater, air-cooler, humidifier, dehumidifier, temperature and humidity sensor, anemograph and control module, the box is airtight, the both ends of box are connected respectively to circulation wind channel both ends, fan, air heater with, air-cooler, humidifier and dehumidifier are all installed in the circulation wind channel, temperature and humidity sensor installs in the box, detects the humiture of the internal air of box, the anemograph is installed in the box, the anemograph detects the velocity of flow of the internal air of box, fan, circulation wind channel, air heater, air-cooler, humidifier, dehumidifier, temperature and humidity sensor and anemograph all are connected with control module.
3. The method for dynamic capacity increase of transmission and transformation lines based on multiple data sources as claimed in claim 2,
the test cable heating device comprises an injection head, an injection pipe, a liquid return head, a liquid return pipe, a liquid tank, an injection pump, a flow velocity meter, a heater, a temperature sensor in the tank, an inlet temperature sensor, an outlet temperature sensor and a controller, wherein the cable temperature detection device comprises a plurality of sheath temperature sensors, the test cable has a preset length L, two ends of the test cable are exposed, a through hole is processed in the middle of a conductor of the test cable, one end of the injection pipe is connected with the injection pump, the injection pump is connected with the liquid tank, the injection head communicates the injection pipe with the through hole at one end of the cable conductor, the liquid return head communicates the liquid return pipe with the through hole at the other end of the cable conductor, the liquid return pipe is connected with the liquid tank, the flow velocity meter is installed between the injection head and the test cable to detect the flow velocity of liquid in the test cable, the heater is installed in, the temperature sensor is installed in the liquid tank, detects the temperature of liquid in the liquid tank, entry temperature sensor installs at annotating liquid overhead, detects the temperature of annotating liquid overhead liquid, exit temperature sensor installs at returning liquid overhead, detects the temperature of liquid in the liquid return overhead, and a plurality of sheath temperature sensor installs on lavatory cable oversheath, detects the temperature on the oversheath, and test cable both ends all are equipped with sheath temperature sensor, annotate liquid pump, heater, incasement temperature sensor, entry temperature sensor, exit temperature sensor and a plurality of sheath temperature sensor and all be connected with the controller.
4. The method for dynamic capacity increase of transmission and transformation lines based on multiple data sources as claimed in claim 3,
the cable heating device also comprises a temperature compensator which is arranged on the liquid injection pipe,
the temperature compensator comprises a shell, a compensation barrel, a sliding plug, a compensation spring, a liquid supplementing pipe, a locking head, a front temperature sensor, a front end temperature sensor and a rear end temperature sensor, wherein the shell is arranged on a liquid injection pipe, the compensation barrel is arranged in the shell, one end of the compensation barrel is open and closed, the open end of the compensation barrel is communicated with the liquid injection pipe, the sliding plug is arranged in the compensation barrel, the sliding plug is abutted against the inner wall of the compensation barrel, one end of the compensation spring is fixedly connected with the sliding plug, the other end of the compensation spring is fixedly connected with the closed end of the compensation barrel, one end of the liquid supplementing pipe is communicated with the part of the barrel close to the closed end, the other end of the liquid supplementing pipe is communicated with the liquid injection pipe, the locking head is arranged on the outer wall of the compensation barrel and used for locking and unlocking the sliding plug, the two ends of the compensation spring are connected with an electronic switch K, leading temperature sensor is located one side that a compensation section of thick bamboo is close to the liquid filling pump, front end temperature sensor installs the position that a compensation section of thick bamboo is close to the notes liquid pipe, rear end temperature sensor installs the position that a compensation section of thick bamboo is close to the fluid infusion pipe, electronic switch K1 control end, locking head, leading temperature sensor, front end temperature sensor and rear end temperature sensor all are connected with the controller.
5. The method for dynamic capacity increase of transmission and transformation lines based on multiple data sources as claimed in claim 4,
the locking head includes locking pipe, locking piece and locking spring, the locking pipe is installed on the compensating cylinder, locking piece and locking pipe sliding connection, locking spring one end and locking piece fixed connection, the locking spring other end and locking pipe fixed connection, the compensating cylinder is opened has the hole that is used for the locking piece to pass through, the locking piece position corresponds with the sliding plug, the locking spring both ends are passed through the wire and are connected with electronic switch K2 and power VT2, electronic switch K2 control end is connected with the controller.
6. The method for dynamic capacity increase of transmission and transformation lines based on multiple data sources as claimed in claim 3,
in the step A), the method for obtaining the function F of the temperature of the cable conductor to the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction comprises the following steps:
A1) heating the liquid in the liquid tank by using a heater to enable the temperature of the liquid to reach a value T1, simulating the temperature of a conductor of the cable, starting a liquid injection pump, injecting the liquid with the temperature of T1 into the test cable, and monitoring the monitoring values of an inlet temperature sensor, an outlet temperature sensor and a plurality of sheath temperature sensors;
A2) when the value of the sheath temperature sensor is basically stable, the temperature of the test cable is shown to reach a stable state, the value of the sheath temperature sensor at the position of the test cable close to one end of the liquid injection head is read and recorded as the head end temperature T1_ s of the outer sheath, the value of the sheath temperature sensor at the position of the test cable close to one end of the liquid return head is read and recorded as the tail end temperature T1_ e of the outer sheath, the monitoring value V of the current meter is read, the environmental temperature and humidity and the wind speed are read by the environmental simulation box, the placement direction of the test cable is changedeThe size of the environment simulation box allows the test cable to be placed in any direction;
A3) the conductor temperature T1, the head end temperature T1_ s of the outer sheath, the tail end temperature T1_ e of the outer sheath, the flow velocity V, the ambient temperature and humidity HT, the wind speed W and the wind direction deltaeAs a set of simulation data, the cable jacket temperature when the function F is obtained is the jacket head end temperature T1_ s.
7. The method for dynamic capacity increase of transmission and transformation lines based on multiple data sources as claimed in claim 6,
in the step B), the method for obtaining the function G of the cable heat dissipation power to the outer sheath temperature, the environment temperature and humidity, the wind speed and the wind direction comprises the following steps:
B1) obtaining the temperature T1_ S of the head end of the outer sheath, the temperature T1_ e of the tail end of the outer sheath, the flow velocity V, the length L of the test cable, the cross section area S of the through hole of the test cable and the liquid density rho under the current simulation environmentLiquid for treating urinary tract infectionAnd liquid specific heat capacity cLiquid for treating urinary tract infection；
B2) Calculating the heat dissipation power P of the unit-length target cable of the test cable under the current environment EtHeat dissipation，PHeat dissipation＝cLiquid for treating urinary tract infection·ρLiquid for treating urinary tract infection·S·V·(T1s-T1_e)；
B3) Will PHeat dissipationAssociating with the temperature of the outer sheath, the ambient temperature and humidity, the wind speed and the wind direction as sample data;
B4) changing the simulation environment in the step B1), and repeating the steps B1) to B3) to obtain enough sample data;
B5) using the sample data obtained in step B4), building and training a neural network model, which is used as function G.
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