CN101825501A - Method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field - Google Patents

Method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field Download PDF

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Publication number
CN101825501A
CN101825501A CN201010170544A CN201010170544A CN101825501A CN 101825501 A CN101825501 A CN 101825501A CN 201010170544 A CN201010170544 A CN 201010170544A CN 201010170544 A CN201010170544 A CN 201010170544A CN 101825501 A CN101825501 A CN 101825501A
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China
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temperature
contact
connector
terminal portions
finite
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CN201010170544A
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Chinese (zh)
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CN101825501B (en
Inventor
王淑娟
胡方
杨文英
韩笑
胡彪
翟国富
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哈尔滨工业大学
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Abstract

The invention provides a method for measuring power connector contact temperature rise based on finite element analysis of a three-dimensional thermal field. The method is used for displaying the measuring result and the room temperature in real time, is convenient for computing the contact temperature rise and is used for judging whether the connector is qualified or not with the testing standard. The method comprises the following steps: establishing a three-dimensional thermal field model of the power connector by utilizing finite element simulation analysis software (ANSYS), establishing a contact resistance equivalent phantom model through computation of the contact resistance and the contact area; carrying out data processing on the temperature of all the nodes on the end face of the connector contact and the temperature of all the nodes at the end of the contact wiring, wherein the temperature is obtained by simulation; verifying the correctness of the model by comparing the above temperature with the instantaneous value, which is measured in test, of the temperature at the end of the connector contact wiring; and an upper computer selecting one phase for measuring. The method can be used for displaying the measuring result and the room temperature in real time, is convenient for computing the contact temperature rise and can be used for judging whether the connector is qualified or not.

Description

Method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field
(1) technical field
The present invention relates to measuring technique, is exactly a kind of method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field specifically.
(2) background technology
Electric connector is the electrical connection arrangement that is specifically applied to rolling stock, city railway vehicle and industrial electrical systems.The passenger train electric connector is the crucial electrical equipment of train power supply, and its performance directly influences the service quality and the security of operation of train.The contact resistance of electric connector should be in the scope of 0~0.8m Ω according to railroad industry standard TB/T 2408-93.Yet when electric connector breaks down, increase along with contact resistance, the Joule heat that is produced by contact resistance is enough to make the temperature of surface of contact sharply to raise, even exceeds the temperature resistant range of its material and it is burnt out, and this also is one of topmost failure mode of electric connector.Therefore monitor very necessary in real time to the contact temperature rise of electric connector.According to railroad industry standard TB/T 2408-93, the test of contact temperature rise should under environment temperature is 25 ℃ condition, apply rated current after 5 hours the detection contact temperature rise be no more than 60 ℃ promptly be judged as qualified.This has not only increased huge workload to relevant departments, and has consumed a large amount of resources and time.In addition, because the contact of electric connector is in the closure casing, can't directly obtain actual temperature data by research technique, measurement has brought certain degree of difficulty to connector contact temperature rise for this.But under certain condition, therefore the size of contact resistance value can reflect the temperature rise of electric connector under nominal load basically, present most of electric connector manufacturers or railway maintenance department is the contact temperature rise that comes the indirect Estimation electric connector by the measurement to contact resistance.Owing to only be a kind of relation qualitatively between the size of contact resistance value and the contact temperature rise, and by the very difficult rising tendency that reflects contact temperature rise in real time of the test of contact resistance value, therefore adopt this method to have certain limitation, and can't obtain the accurate data of contact temperature rise and judge the reliability of connector work effectively.
(3) summary of the invention
The object of the present invention is to provide a kind of real-time demonstration measurement result and house temperature, convenient calculate contact temperature rise and utilize testing standard to judge the method for measuring power connector contact temperature rise that connector is whether qualified based on finite element analysis of three-dimensional thermal field.
The object of the present invention is achieved like this: described method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field, and step is as follows:
Step 1: utilize the finite element simulation analysis software ANSYS to set up electric connector three-dimensional thermal field model, utilize contact resistance value and contact area size, set up contact resistance equivalent model by calculating, carry out thermal transient-electric coupling simulation analysis, the temperature field distribution plan of out connector, the instantaneous value and the time dependent curve of connector contact temperature, contact terminal portions temperature;
Step 2: all node temperatures of connector contact end face and all node temperatures of contact terminal portions that emulation is obtained carry out data processing, obtain the instantaneous mean value of connector contact temperature and contact terminal portions temperature;
Step 3: by with test in the instantaneous value contrast of the connector contact terminal portions temperature that records, the correctness of verification model;
Step 4: by the curve fitting order among the MATLAB, device contact temperature and contact terminal portions mathematic model of temperature of connecting and drafting matched curve;
Step 5: upper computer selecting one is measured mutually, and the contact terminal portions temperature data that collects by the mathematical model set up and temperature measuring circuit calculates the contact temperature value and judges according to standard whether electric connector is qualified;
Step 6: next continues upper computer selecting to measure mutually.
The present invention is based on the method for measuring power connector contact temperature rise of finite element analysis of three-dimensional thermal field, broken through the restriction that the existing power connector testing apparatus can't the measuring contacts temperature rise, can measure the temperature rise of each phase contact of electric connector; And, shortened the time of electric connector temperature rise test effectively by the finite element simulation computational analysis, make the efficient of electric connector test improve greatly; Be sent to by temperature measuring circuit collecting temperature data and analyze in the host computer and to handle; Can show measurement result and house temperature in real time, convenient calculating contact temperature rise also utilizes testing standard to judge whether connector is qualified.
(4) description of drawings
Fig. 1 is a measuring method process flow diagram of the present invention.
(5) embodiment
The invention will be further described for example below in conjunction with accompanying drawing.
Embodiment 1: in conjunction with Fig. 1, the present invention is based on the method for measuring power connector contact temperature rise of finite element analysis of three-dimensional thermal field, step is as follows:
Step 1: utilize the finite element simulation analysis software ANSYS to set up electric connector three-dimensional thermal field model, utilize contact resistance value and contact area size, set up contact resistance equivalent model by calculating, carry out thermal transient-electric coupling simulation analysis, the temperature field distribution plan of out connector, the instantaneous value and the time dependent curve of connector contact temperature, contact terminal portions temperature;
Step 2: all node temperatures of connector contact end face and all node temperatures of contact terminal portions that emulation is obtained carry out data processing, obtain the instantaneous mean value of connector contact temperature and contact terminal portions temperature;
Step 3: by with test in the instantaneous value contrast of the connector contact terminal portions temperature that records, the correctness of verification model;
Step 4: by the curve fitting order among the MATLAB, device contact temperature and contact terminal portions mathematic model of temperature of connecting and drafting matched curve;
Step 5: upper computer selecting one is measured mutually, and the contact terminal portions temperature data that collects by the mathematical model set up and temperature measuring circuit calculates the contact temperature value and judges according to standard whether electric connector is qualified;
Step 6: next continues upper computer selecting to measure mutually.
Embodiment 2: the present invention is based on the method for measuring power connector contact temperature rise of finite element analysis of three-dimensional thermal field, comprise following content:
(1) utilizes the finite element simulation analysis software ANSYS to set up electric connector three-dimensional thermal field model, and carry out thermal transient-electric coupling simulation analysis, comprise the cell type of preference pattern and the material properties of definition model; Set up the electric connector geometric model; Utilize contact resistance value and contact area size, set up contact resistance equivalent model by calculating; Select the subnetting precision, divide grid; Temperature boundary condition, voltage boundary condition are set and apply current load; The time step that setting is found the solution and the thermal transient of carrying out-electric coupling simulation analysis; The temperature field distribution plan of out connector, the instantaneous value and the time dependent curve of connector contact temperature, contact terminal portions temperature.
(2) all node temperatures of connector contact end face and all node temperatures of contact terminal portions that emulation is obtained carry out data processing, obtain the instantaneous mean value of connector contact temperature and contact terminal portions temperature.
(3) by with test in the instantaneous value contrast of the connector contact terminal portions temperature that records, the correctness of verification model.
(4) by the curve fitting order among the MATLAB, device contact temperature and contact terminal portions mathematic model of temperature of connecting and drafting matched curve.
(5) upper computer selecting one is measured mutually, and the contact terminal portions temperature data that collects by the mathematical model set up and temperature measuring circuit calculates the contact temperature value and judges according to standard whether electric connector is qualified.
(6) upper computer selecting next continue mutually to measure.
According to the method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field of the present invention, it is as follows to provide an electric connector temperature measurement example:
The operating voltage of used electric connector KC20D is 500V (AC50Hz) in the practical measuring examples, and working current is 425A.This electric connector is a three-phase four-wire system, and therefore when measuring, the contact temperature rise of A, B, C three-phase all needs to measure.Measuring process is as follows:
Step 1: size, the each several part material properties of determining to measure used electric connector.The main material of electric connector KC20D has brass and ambroin, and the material properties that needs to determine comprises density, specific heat capacity, coefficient of heat conductivity and resistivity.
Step 2: utilize the finite element simulation analysis software ANSYS to set up electric connector three-dimensional finite element thermal field model, comprise with the lower part:
(1) selection unit's type is the three-dimensional hexahedral element of SOLID69 heat-electric coupling, according to measuring the gained size, select Create Volumes order in the Modeling submenu under the Preprocessor of finite element software ANSYS menu, the bottom-up three-dimensional finite element model of setting up electric connector KC20D;
(2) according to the contact resistance value that records in contact area size in the measurement gained size and the test,, set up the geometric model of contact resistance equivalent by calculating size and the equivalent resistivity of determining the contact resistance equivalent;
(3) the thermal behavior parameter and the electric parameter of difference setting model each several part;
(4) select Operate in the Modeling submenu under the Preprocessor of finite element software ANSYS menu, in its drop-down menu, select the Overlap Volumes order in the Booleans boolean operation again, the surface of contact of each solid of being set up is pasted together;
(5) select the subnetting precision be 6 freely divide net mode, electric connector KC20D three-dimensional finite element model is divided grid operations;
The initial room-temperature value that records when (6) the temperature boundary condition being set for test, NATURAL CONVECTION COEFFICIENT OF HEAT is set respectively according to the difference of each face radiating condition;
(7) according to the condition of work setting voltage boundary condition 500V that measures used electric connector KC20D, on the host node of surface of contact, apply current load 425A;
(8) setting the simulation time step-length is 60s, and the time is 50min, and emulation mode is chosen as thermal transient-electric coupling emulation, beginning emulation;
(9) the temperature field distribution plan of out connector, the instantaneous value and the time dependent curve of connector contact temperature, contact terminal portions temperature.
Step 3: in MATLAB, all node temperatures of connector contact end face and all node temperatures of contact terminal portions of exporting among the finite element emulation software ANSYS are carried out data processing, obtain the instantaneous mean value of connector contact temperature and contact terminal portions temperature.
Step 4: utilize the 18B20 temperature measurement circuit to measure the contact terminal portions temperature of A, B, C three-phase, utilize MATLAB to draw the time dependent curve of contact terminal portions measured temperature of A, B, C three-phase.
Step 5: through comparison, simulation curve and trial curve basically identical, and when 50min, all tend towards stability.The steady-state value of the contact terminal portions temperature that temperature measurement circuit records is 41.7500 ℃, and the steady-state value of the contact terminal portions temperature that emulation obtains is 41.4606 ℃, and steady-state deviation is 0.1396 ℃, is 0.33% of steady-state value only, has verified the correctness of model.
Step 6: by the curve fitting order among the MATLAB, as the X value, the connector contact temperature is as the Y value with contact terminal portions temperature, device contact temperature and the contact terminal portions mathematic model of temperature of connecting and draw matched curve.
Step 7:, upper computer selecting one begins to measure the electric connector temperature rise mutually, and computing machine is stored the initial value of 18B20 temperature measurement circuit and is shown as house temperature, and recording the experimental enviroment room temperature is 22 ℃.
Step 8: the continuous temperature measurement computer-chronograph directly calculates the contact temperature value and judges according to standard whether electric connector is qualified by the contact terminal portions temperature data that the mathematical model set up and temperature measuring circuit collect.According to simulation result, work under the rated current steady-state value of the contact terminal portions temperature behind the 50min of electric connector KC20D is 41.4606 ℃, and the contact temperature steady-state value is 42.4991 ℃, and temperature rise is 20.4991 ℃, be no more than 60 ℃, therefore judge that this electric connector KC20D is qualified.
Step 9: the host computer storage of measurement data, select next to continue mutually to measure.

Claims (1)

1. method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field, it is characterized in that: step is as follows:
Step 1: utilize the finite element simulation analysis software ANSYS to set up electric connector three-dimensional thermal field model, utilize contact resistance value and contact area size, set up contact resistance equivalent model by calculating, carry out thermal transient-electric coupling simulation analysis, the temperature field distribution plan of out connector, the instantaneous value and the time dependent curve of connector contact temperature, contact terminal portions temperature;
Step 2: all node temperatures of connector contact end face and all node temperatures of contact terminal portions that emulation is obtained carry out data processing, obtain the instantaneous mean value of connector contact temperature and contact terminal portions temperature;
Step 3: by with test in the instantaneous value contrast of the connector contact terminal portions temperature that records, the correctness of verification model;
Step 4: by the curve fitting order among the MATLAB, the mathematical relation of connect device contact temperature and contact terminal portions temperature and drafting matched curve;
Step 5: upper computer selecting one is measured mutually, and the contact terminal portions temperature data that collects by the mathematical relation set up and temperature measuring circuit calculates the contact temperature value and judges according to standard whether electric connector is qualified;
Step 6: next continues upper computer selecting to measure mutually.
CN2010101705444A 2010-05-13 2010-05-13 Method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field CN101825501B (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103970947A (en) * 2014-05-05 2014-08-06 同济大学 Real-time temperature rise measurement method of electromagnetic system of low-voltage apparatus based on finite element analysis
CN103995928A (en) * 2014-05-16 2014-08-20 双良节能系统股份有限公司 Finite element analysis method for structure of interstage cooling equipment in space division industry
CN104776938A (en) * 2015-04-14 2015-07-15 武汉大学 Cable-joint cable core temperature inversion method and system on basis of surface temperature of cable
CN105973929A (en) * 2016-03-17 2016-09-28 中国科学院等离子体物理研究所 Non-destructive testing method for detecting thermal contact resistance inside parts by infrared camera
CN106644163A (en) * 2016-11-10 2017-05-10 河北工业大学 Miniature circuit breaker internal temperature rise measuring method based on temperature field finite element analysis
CN107607221A (en) * 2017-08-03 2018-01-19 中国电力科学研究院 A kind of current-carrying temperature rise experimental method and system for current conversion station tab terminal
WO2018050015A1 (en) * 2016-09-19 2018-03-22 舍弗勒技术股份两合公司 Temperature acquisition method and apparatus for target element, and method and apparatus for evaluating lifetime of bearing
CN108181000A (en) * 2018-01-02 2018-06-19 国网上海市电力公司 A kind of contact of breaker detection method for temperature rise based on GIS housing thermometrics
CN108536906A (en) * 2018-03-01 2018-09-14 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of bushing temperature field distribution method of the calculating containing connected structure
CN108761241A (en) * 2018-06-07 2018-11-06 中国电子科技集团公司第五十四研究所 A kind of nonlinear effect modeling method of radio frequency (RF) coaxial connector
CN108896803A (en) * 2018-05-24 2018-11-27 哈尔滨工业大学 Electric energy meter measuring accuracy optimization method based on temperature-compensating
CN109974873A (en) * 2019-04-03 2019-07-05 清华大学 A kind of temperature monitoring method of rolling average

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103970947A (en) * 2014-05-05 2014-08-06 同济大学 Real-time temperature rise measurement method of electromagnetic system of low-voltage apparatus based on finite element analysis
CN103995928A (en) * 2014-05-16 2014-08-20 双良节能系统股份有限公司 Finite element analysis method for structure of interstage cooling equipment in space division industry
CN104776938B (en) * 2015-04-14 2017-06-16 武汉大学 Cable connector core temperature inversion method and system based on cable surface temperature
CN104776938A (en) * 2015-04-14 2015-07-15 武汉大学 Cable-joint cable core temperature inversion method and system on basis of surface temperature of cable
CN105973929A (en) * 2016-03-17 2016-09-28 中国科学院等离子体物理研究所 Non-destructive testing method for detecting thermal contact resistance inside parts by infrared camera
WO2018050015A1 (en) * 2016-09-19 2018-03-22 舍弗勒技术股份两合公司 Temperature acquisition method and apparatus for target element, and method and apparatus for evaluating lifetime of bearing
CN106644163A (en) * 2016-11-10 2017-05-10 河北工业大学 Miniature circuit breaker internal temperature rise measuring method based on temperature field finite element analysis
CN107607221B (en) * 2017-08-03 2020-06-02 中国电力科学研究院 Current-carrying-temperature-rise experimental method and system for converter station joint terminal
CN107607221A (en) * 2017-08-03 2018-01-19 中国电力科学研究院 A kind of current-carrying temperature rise experimental method and system for current conversion station tab terminal
CN108181000A (en) * 2018-01-02 2018-06-19 国网上海市电力公司 A kind of contact of breaker detection method for temperature rise based on GIS housing thermometrics
CN108536906A (en) * 2018-03-01 2018-09-14 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of bushing temperature field distribution method of the calculating containing connected structure
CN108896803A (en) * 2018-05-24 2018-11-27 哈尔滨工业大学 Electric energy meter measuring accuracy optimization method based on temperature-compensating
CN108896803B (en) * 2018-05-24 2020-08-18 哈尔滨工业大学 Electric energy meter metering precision optimization method based on temperature compensation
CN108761241A (en) * 2018-06-07 2018-11-06 中国电子科技集团公司第五十四研究所 A kind of nonlinear effect modeling method of radio frequency (RF) coaxial connector
CN108761241B (en) * 2018-06-07 2021-04-20 中国电子科技集团公司第五十四研究所 Nonlinear effect modeling method of radio frequency coaxial connector
CN109974873A (en) * 2019-04-03 2019-07-05 清华大学 A kind of temperature monitoring method of rolling average
CN109974873B (en) * 2019-04-03 2020-06-02 清华大学 Moving average temperature monitoring method

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