CN105606923A - Cable current carrying limit determination method based on numerical simulation and passive wireless temperature measurement - Google Patents
Cable current carrying limit determination method based on numerical simulation and passive wireless temperature measurement Download PDFInfo
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- CN105606923A CN105606923A CN201510953304.4A CN201510953304A CN105606923A CN 105606923 A CN105606923 A CN 105606923A CN 201510953304 A CN201510953304 A CN 201510953304A CN 105606923 A CN105606923 A CN 105606923A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to a cable current carrying limit determination method based on numerical simulation and passive wireless temperature measurement, and the method comprises the following steps: 1), building a cable test bench; 2), building a simulation model according to the laying mode of a cable in the cable test bench and an environment parameter through employing ANSYS software, and setting a boundary condition parameter; 3), calculating a calculation temperature field of the cable according to the simulation model when a set current passes through the cable; 4), enabling the set current to enter into the cable of the cable test bench, and measuring the test temperature field of the cable through employing a passive wireless sound surface wave measurement system when the set current passes through the cable; 5), obtaining the error between the calculation temperature field and the test temperature field, and judging whether the error is within an allowed range or not: calculating the current-carrying limit of the cable according to the simulation model if the error is within the allowed range, or else, carrying out error analysis, adjusting the simulation model and/or the passive wireless sound surface wave measurement system according to an analysis result, and returning to step 3). Compared with the prior art, the method effectively reduces a theoretical calculation error and an experiment measurement error.
Description
Technical field
The present invention relates to power cable technical field, especially relate to a kind of based on numerical simulation and passive and wireless surveyThe cable current-carrying limit of temperature is determined method.
Background technology
The research history that power circuit current-carrying capacity calculates is almost to synchronize with the invention of cable to produce. The cable of flowing through is ledThe electric current of body can generate heat because of loss, under the limiting temperature condition can bear at known insulating materials, and technical staffNeed to know the lowest high-current value that cable can bear, to improve the utilization rate of cable machinery. The meter of early stage current-carrying capacityCalculation is limited to computing capability at that time, mainly the across comparison method based in engineering or the plan to empirical dataClose. Nineteen fifty-seven Neher and McGrath adopt thermal resistance, thermal capacitance parameter model successfully cable hot loop to be carried outLayered modeling, the two-port network after simplification is easy to hand computation, and has reached quite high precision. These class methodsBe referred to as the analytic method that current-carrying capacity of cable calculates. The method is also at present aspect device fabrication, standard formulationFoundation. International Electrotechnical Commission (IEC) formulates according to the international conference on large HV electric systems report of 1964 and nineteen eighty-twoCable rated current-carrying capacity calculate standard. Amendment and the supplement through more than 20 years to this standard subsequently, has formed existingCalculate normative document IEC60287 standard the most authoritative in this field at current-carrying capacity of cable, determined 100% loadCurrent-carrying capacity formula, thermal resistance calculation formula and relevant service condition under factor condition. China announced in the time of 2000The Machinery Ministry standard JB/T10181 corresponding with it, be current this field the most authoritative domestic regulatory documents.
But calculating analytic method, the current-carrying capacity of cable of above-mentioned standard support cannot tackle multiloop cluster laying, cable crossingThe complex environments such as unbalanced soil, tunnel and bridge, and disturbance factor in line channel, make operationDepartment is difficulties in the time selecting correction coefficient.
The twentieth century middle and later periods, along with popularizing of computer technology and improving constantly of numerical computations ability, research peopleMember attempts application numerical heat transfer, uses more complicated model to carry out modeling, imitative to cable and cable periphery thermal fieldVery, and by finite element, the finite difference a collection of numerical algorithm that grades solve final temperature value. With analytic method notWith, in numerical model, can build for situations such as multiloop cable, complicated soil environment, other pipeline thermals sourceMould, has expanded the practicality of algorithm greatly, has improved counting accuracy. These class methods are referred to as current-carrying capacity of cable meterThe numerical method of calculating, wherein, in these numerical methods, applies more having, finite difference calculus, FInite Element,Boundary element method, Finite Volume Method for Air etc.
But actual cable surrounding environment complexity of laying, to the influence factor of cable periphery thermal field and current capacityNumerous, as the thermal resistivity of environment temperature, the soil moisture, cable ambient substance, soil thermal resistivity, moisture moveMove etc., when this makes to use numerical method, cable and the modeling of periphery thermal field are existed theoretic simplification and bring mistakePoor, therefore, no matter be analytic method or numerical method all need to coordinate certain verification experimental verification could to calculate accuratelyProperty is held.
At present, the verification experimental verification of current-carrying capacity of cable adopts the temperature of each layer of thermocouple measurement cable to realize conventionally. RootAccording to IEC60287 series standard regulation, when cable conductor temperature reaches 90 DEG C (crosslinked polyethylene major insulation cable)The current-carrying capacity that corresponding conductor current is cable. Because current-carrying capacity of cable is subject to the impact of laid condition larger, and outsideAmbient parameter (as ground temperature, soil thermal resistivity etc.) is dynamic change, thereby current-carrying capacity test also need not makeConductor temperature reaches 90 DEG C just, only need to pass to a certain constant current to cable, measures each layer of temperature of cable,Then carrying out interlayer Temperature Rise Analysis can calculate by proof theory. Therefore cable is continuously applied to fixed current to steady in testState, records each layer of temperature of cable also by the thermocouple being arranged on conductor, metallic shield, armouring and cable skinCalculate the each layer of temperature difference, by test value and the calculated value of the more each layer of temperature difference, thus the hot road of cable of checking analytic methodEach thermal resistance of model and the correctness of loss and the accuracy of numerical method.
At present, only a few electric company and colleges and universities combine carried out power cable analytic method current-carrying capacity result of calculation based onThe demonstration test of thermocouple, finds with respect to practical operation situation, calculated value and test measurements all exist mistakePoor. First, adopt analytic method to have theoretically error, because analytic method cannot Simulation of Complex laying state.Secondly, measuring system itself is a reason that causes error, and particularly the temperature in test is to survey by thermocoupleAmount, itself there is certain error. This is that measurement point has far away to measuring point because cable itself is longerDistance, makes the error of thermocouple larger; The intervention of thermocouple causes the change in cable body temperature field also to causeA reason of error; Thermocouple and measured material loose contact, will produce thermal contact resistance in addition, brings error.
Summary of the invention
Object of the present invention is exactly for particularly Cable Group its current-carrying limit under complex laying condition mode of power cable(allowing for a long time current-carrying capacity) adopts the analytic method based on IEC60287 standard to be difficult to determine, and for specifically layingThere is larger error in the thermocouple method of the cable of mode and Cable Group verification experimental verification, causes the cable current-carrying limit to existAll there is the poor problem of accuracy in calculated value and test measurements, and provides a kind of based on numerical simulation and nothingThe cable current-carrying limit of source wireless temperature measurement is determined method, effectively reduces theory error and experiment measuring error.
Object of the present invention can be achieved through the following technical solutions:
The cable current-carrying limit based on numerical simulation and passive and wireless thermometric is determined a method, comprises the following steps:
1) set up cable testing platform;
2) adopt ANSYS software to set up imitative according to the system of laying of cable in cable testing platform and ambient parameterTrue mode, and the boundary condition parameter of this simulation model is set;
3) calculate the accounting temperature field of cable when by setting electric current according to simulation model;
4) pass in the cable of cable testing platform with described setting electric current, by passive wireless acoustic surface wave thermometricSystematic survey obtains the test temperature field of cable when by setting electric current;
5) obtain the error of accounting temperature field and test temperature field, judge that this error is whether in allowed band, ifTo perform step 6), if not, carry out error analysis, regulate simulation model and/or nothing according to analysis resultSource wireless acoustic surface wave temp measuring system, returns to step 3);
6) calculate the cable current-carrying limit according to simulation model.
Described cable testing platform comprises the cable and the test current source that are connected, and arranges and lay accordingly environment.
Described ambient parameter comprises environment temperature, ground temperature, soil thermal resistivity and ambient substance thermal conductivity factor.
Described step 3) in, calculate before the accounting temperature field of cable when by setting electric current, setting electric current is set,And the hot-fluid of each layer of cable is set, each layer of described cable comprises cable conductor, metallic shield, armouring and crust.
Described step 3) in, by the temperature of accounting temperature field acquisition cable conductor, metallic shield, armouring and crustDegree calculated value.
Described passive wireless acoustic surface wave temp measuring system comprises the passive wireless temperature sensor, the reading that connect successivelyDevice, optical fiber communication network and monitoring backstage, described passive wireless temperature sensor is provided with multiple, distributes and is arranged at electricityIn cable test platform.
Described step 4) in, passive wireless acoustic surface wave temp measuring system measure cable by setting when electric currentThe detailed process of test temperature field is:
401) monitoring Background control reader is visited to passive wireless temperature sensor transmitting radio frequency with setting-up time intervalAsk pulse signal, passive wireless temperature sensor returns to the oscillator signal of reflection temperature information;
402) reader carries out obtaining after demodulation the measured temperature of each layer of cable to the oscillator signal receiving, and returnsReturn to monitoring backstage, each layer of described cable comprises cable conductor, metallic shield, armouring and crust;
403) monitoring backstage generates the test temperature field of cable according to the measured temperature of each layer of cable.
Described reader comprise successively the microprocessor that connects, microcontroller, signal controller, D/A converter,First signal amplifier, signal transmitting and receiver, secondary signal amplifier, A/D converter and demodulator of PM signal PM,Described demodulator of PM signal PM is connected with microcontroller, and described microprocessor connects by optical fiber communication network and monitoring backstageConnect, described signal transmitting and receiver are by wireless network and passive wireless temperature sensor.
Described passive wireless temperature sensor is mode of resonance temperature sensor.
Compared with prior art, the present invention has the following advantages:
(1) the present invention is combined and is determined the power cable current-carrying utmost point by numerical simulation mode and passive and wireless temp measuring systemLimit, can make theoretical modeling and verification experimental verification all meet the truth of cable laying, has effectively reduced theoretical and experimentThe error of measuring.
(2) the present invention adopts passive wireless temperature sensor to carry out temperature survey, easy to operate, defeated distance,Strong interference immunity.
(3) the present invention effectively improves the power cable current-carrying limit definite accuracy and reliability.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention;
Fig. 2 is passive and wireless temp measuring system principle schematic of the present invention;
Fig. 3 is passive wireless temperature sensor principle schematic of the present invention;
Fig. 4 is the principle schematic of cable testing platform of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail. The present embodiment is with the technology of the present invention sideCase is that prerequisite is implemented, and has provided detailed embodiment and concrete operating process, but protection model of the present inventionEnclose and be not limited to following embodiment.
As shown in Figure 1, the present embodiment provides a kind of cable current-carrying limit based on numerical simulation and passive and wireless thermometricDetermine method, comprise the following steps:
1) set up cable testing platform. The cable testing platform of setting up as shown in Figure 4, comprises the electricity being connectedCable 5 and test current source 6, and arrange and lay accordingly environment. In the present embodiment, adopt YJLV22 sectional areaFor the 8.7/10kV cable of 300mm2, length is 20 meters, adopts groove system of laying. For the ease of showing,In Fig. 4, cable schematic diagram only draws single cored structure, is actually three-core structure. Because be midium voltage cable, cable is adoptedUse two-terminal-grounding mode.
2) adopt ANSYS software to set up imitative according to the system of laying of cable in cable testing platform and ambient parameterTrue mode, and the boundary condition parameter of this simulation model is set.
While setting up simulation model, need to consider in detail cable in cable testing platform the construction of cable, system of laying,Arrangement mode, ambient parameter etc. affect parameter, and wherein, ambient parameter comprises environment temperature, ground temperature, soil thermal resistanceCoefficient and ambient substance thermal conductivity factor etc. In the time that boundary condition parameter is set, consider hot conduction, convection current and spokeThe parameter of the realistic laid condition of penetrating etc., as deep soil temperature, the both sides soil moisture, heat convection at a distanceCoefficient etc.
3) calculate the accounting temperature field of cable when by setting electric current according to simulation model. Calculating cable is passing throughBefore accounting temperature field while setting electric current, setting electric current is set, and the hot-fluid of each layer of cable is set, each layer of bag of cableDraw together cable conductor, metallic shield, armouring and crust. By accounting temperature field obtain cable conductor, metallic shield,The temperature computation value of armouring and crust.
4) pass into set electric current in the cable of cable testing platform, by passive wireless acoustic surface wave temp measuring systemMeasure cable by the measured temperature of setting each layer of cable when electric current, each layer of cable comprise cable conductor,Metallic shield, armouring and crust, thus test temperature field obtained.
5) obtain the error of accounting temperature field and test temperature field, judge that this error is whether in allowed band, ifTo perform step 6), if not, carry out error analysis, regulate simulation model and/or nothing according to analysis resultSource wireless acoustic surface wave temp measuring system, returns to step 3).
Because cable conductor, insulation, metallic shield, steel-tape armouring and crust all can produce thermal losses, form heatStream, therefore temperature computation value and test value contrast need to be carried out at these structure sheafs, and insulation and metallic shield hot-fluidCan merge comparison. As the temperature difference of each layer of temperature computation value of cable and test value in the situation that leading to a certain constant currentWithin the scope of allowable error, show theoretical calculating accurately, simulation model is feasible, thereby can continue to calculate cableThe current-carrying limit be current-carrying capacity, if error amount exceeds allowed band, need to theoretical calculation and test test intoRow error analysis, finds the reason that error is large, recalculates and tests after getting rid of this reason.
6) calculate the cable current-carrying limit according to simulation model.
As shown in Figure 2, passive wireless acoustic surface wave temp measuring system comprises the passive wireless temperature sensor connecting successively1, reader 2, optical fiber communication network 3 and monitoring backstage 4, passive wireless temperature sensor 1 is provided with multiple, pointCloth is arranged in cable testing platform. The distance of each passive wireless temperature sensor 1 and corresponding reader 2 is littleIn 3 meters.
The operation principle of passive wireless acoustic surface wave temp measuring system is: 401) monitoring Background control reader is to setThe time interval, passive wireless temperature sensor returned to passive wireless temperature sensor transmitting radio frequency access pulse signalBe the oscillator signal of the reflection temperature information of damping vibration attenuation, the resonance that the centre frequency of this oscillator signal is resonator frequentlyRate, and this resonant frequency is relevant with the temperature (temperature that cable is each layer) of the piezoelectric substrate of sensor, resonant frequencyChange in certain temperature range, be regulated linear relation with the change of temperature, therefore can return by measurement wirelessThe change of frequency of signal obtains temperature value; 402) reader carries out obtaining electricity after demodulation to the oscillator signal receivingThe measured temperature that cable is each layer, returns to monitoring backstage; 403) monitoring backstage is according to the temperature survey of each layer of cableValue generates the test temperature field of cable. In test, by test current source to conductor dbus with constant current, by cableConductor temperature rises to a certain degree and in 5 hours, changes and be not more than 1 DEG C and reach as cable conductor temperature continuouslyThe criterion of stable state.
Reader 2 comprises the microprocessor 201, microcontroller 202, signal controller 203, the D/A that connect successivelyConverter 204, first signal amplifier 205, signal transmitting and receiver 206, secondary signal amplifier 207,A/D converter 208 and demodulator of PM signal PM 209, demodulator of PM signal PM 209 is connected with microcontroller 202, micro-processingDevice 201 is connected with monitoring backstage 4 by optical fiber communication network 3, and signal transmitting is passed through wireless network with receiver 206Network and passive wireless temperature sensor 1.
Reader can be simultaneously and 12 passive wireless temperature sensors carry out wireless telecommunications, frequency range exists424.5MHz～442.0MHz, is divided into 12 frequency ranges, for 12 sensors. As shown in Figure 4, passive nothingIn line surface acoustic wave temp measuring system, be provided with three readers, wherein, respectively with 8 of reader a and reader cPassive wireless temperature sensor carries out radio communication, and 8 passive wireless temperature sensors are respectively 3 survey three-phases and leadTemperature, 3 survey three-phase metallic shield temperature, 1 survey sheath temperature, 1 survey crust temperature. Reader bCarry out radio communication with 5 passive wireless temperature sensors, wherein 5 passive wireless temperature sensors are respectively 1The soil moisture of bottom of trench and both sides is laid groove environment temperature, 3 and surveys respectively in individual survey cable sheath temperature, 1 survey.So, cable three-phase conductor, three-phase metallic shield are provided with respectively 2 points for measuring temperature, and armouring is provided with 2 thermometricsPoint, crust is provided with 3 points for measuring temperature, and getting respectively its mean value is temperature measurement result.
Passive wireless temperature sensor adopts quartzy YX to hob electric crystal, is resonance sensor. Passive and wireless temperatureAs shown in Figure 3, the change of environment temperature can cause changing of surface acoustic wave dynamic characteristic in piezoelectric to degree Fundamentals of SensorsBecome, in resonance sensor, the interdigital transducer on piezoelectric substrate by inverse piezoelectric effect by input wireless signal(being sent by reader) is transformed into acoustic signals, reflects to form resonance by reflecting grating, the size of resonant frequency withEnvironment temperature is corresponding, when same interdigital transducer is transformed into resonant acoustic wave electromagnetic wave signal by piezo-electric effectAfter wireless signal output, can obtain temperature value.
Claims (9)
1. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric is determined a method, it is characterized in that,Comprise the following steps:
1) set up cable testing platform;
2) adopt ANSYS software to set up imitative according to the system of laying of cable in cable testing platform and ambient parameterTrue mode, and the boundary condition parameter of this simulation model is set;
3) calculate the accounting temperature field of cable when by setting electric current according to simulation model;
4) pass in the cable of cable testing platform with described setting electric current, by passive wireless acoustic surface wave thermometricSystematic survey obtains the test temperature field of cable when by setting electric current;
5) obtain the error of accounting temperature field and test temperature field, judge that this error is whether in allowed band, ifTo perform step 6), if not, carry out error analysis, regulate simulation model and/or nothing according to analysis resultSource wireless acoustic surface wave temp measuring system, returns to step 3);
6) calculate the cable current-carrying limit according to simulation model.
2. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 1 is determinedMethod, is characterized in that, described cable testing platform comprises the cable and the test current source that are connected, and phase is setThat answers lays environment.
3. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 1 is determinedMethod, is characterized in that, described ambient parameter comprises environment temperature, ground temperature, soil thermal resistivity and ambient substanceThermal conductivity factor.
4. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 1 is determinedMethod, is characterized in that, described step 3) in, calculate before the accounting temperature field of cable when by setting electric current,Setting electric current is set, and the hot-fluid of each layer of cable is set, each layer of described cable comprise cable conductor, metallic shield,Armouring and crust.
5. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 4 is determinedMethod, is characterized in that, described step 3) in, by accounting temperature field obtain cable conductor, metallic shield,The temperature computation value of armouring and crust.
6. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 1 is determinedMethod, is characterized in that, described passive wireless acoustic surface wave temp measuring system comprises the passive and wireless temperature connecting successivelySensor, reader, optical fiber communication network and monitoring backstage, described passive wireless temperature sensor is provided with multiple,Distribution is arranged in cable testing platform.
7. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 6 is determinedMethod, is characterized in that, described step 4) in, passive wireless acoustic surface wave temp measuring system is measured to such an extent that cable is leading toThe detailed process of crossing the test temperature field while setting electric current is:
401) monitoring Background control reader is visited to passive wireless temperature sensor transmitting radio frequency with setting-up time intervalAsk pulse signal, passive wireless temperature sensor returns to the oscillator signal of reflection temperature information;
402) reader carries out obtaining after demodulation the measured temperature of each layer of cable to the oscillator signal receiving, and returnsReturn to monitoring backstage, each layer of described cable comprises cable conductor, metallic shield, armouring and crust;
403) monitoring backstage generates the test temperature field of cable according to the measured temperature of each layer of cable.
8. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 6 is determinedMethod, is characterized in that, described reader comprise successively the microprocessor that connects, microcontroller, signal controller,D/A converter, first signal amplifier, signal transmitting and receiver, secondary signal amplifier, A/D converterAnd demodulator of PM signal PM, described demodulator of PM signal PM is connected with microcontroller, and described microprocessor passes through optical fiber communication networkBe connected with monitoring backstage, described signal transmitting and receiver are by wireless network and passive wireless temperature sensor.
9. the cable current-carrying limit based on numerical simulation and passive and wireless thermometric according to claim 6 is determinedMethod, is characterized in that, described passive wireless temperature sensor is mode of resonance temperature sensor.
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| CN106248216A (en) * | 2016-07-29 | 2016-12-21 | 西安空间无线电技术研究所 | A kind of big temperature difference system of large-scale deployable antenna builds and method of testing |
| CN113589065A (en) * | 2021-06-22 | 2021-11-02 | 中国电力科学研究院有限公司 | Method and device for testing current carrying capacity of directly-buried cable |
| CN113917275A (en) * | 2020-07-09 | 2022-01-11 | 广州华南星光电力科技有限责任公司 | Integrated small-size conductor current-carrying temperature rise test device |
| US20220034727A1 (en) * | 2018-12-20 | 2022-02-03 | Schaeffler Technologies AG & Co. KG | Detection system and wind driven generator |
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| US20220034727A1 (en) * | 2018-12-20 | 2022-02-03 | Schaeffler Technologies AG & Co. KG | Detection system and wind driven generator |
| CN113917275A (en) * | 2020-07-09 | 2022-01-11 | 广州华南星光电力科技有限责任公司 | Integrated small-size conductor current-carrying temperature rise test device |
| CN113589065A (en) * | 2021-06-22 | 2021-11-02 | 中国电力科学研究院有限公司 | Method and device for testing current carrying capacity of directly-buried cable |
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