CN112964311A - Test device for testing current-carrying capacity of automobile cable and maximum conductor temperature rise during overload - Google Patents
Test device for testing current-carrying capacity of automobile cable and maximum conductor temperature rise during overload Download PDFInfo
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- CN112964311A CN112964311A CN202110418341.0A CN202110418341A CN112964311A CN 112964311 A CN112964311 A CN 112964311A CN 202110418341 A CN202110418341 A CN 202110418341A CN 112964311 A CN112964311 A CN 112964311A
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- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 239000004020 conductor Substances 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000004088 simulation Methods 0.000 claims abstract description 23
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 3
- 238000005192 partition Methods 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000010998 test method Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
Abstract
The invention discloses a test device for testing the current-carrying capacity of an automobile cable and the maximum temperature rise of a conductor during overload, which belongs to the technical field of automobile cable test equipment and is characterized in that: including the thermostatic chamber, set up the thermostated container in the thermostatic chamber, the thermostated container includes detachable material simulation baffle and is used for installing the carrier of test cable, the material simulation baffle encloses and constitutes the case room, the carrier set up in the case room, install the temperature measurement original paper in the case room of thermostatic chamber and thermostated container. The device can simulate the cable working environment of the new energy automobile so as to ensure that the cable measuring result is better, accurate and reliable.
Description
Technical Field
The invention belongs to the technical field of automobile cable test equipment, and particularly relates to a test device for testing the current-carrying capacity of an automobile cable and the maximum temperature rise of a conductor during overload.
Background
With the development of economy, automobiles become indispensable transportation means in people's lives, and the automobiles are widely popularized in families of the general public. The new energy automobile takes electric energy as power energy, has the advantages of environmental protection, is not limited by urban traffic number limit policies, and has become the first choice of people for purchasing automobiles. However, new energy vehicles frequently generate spontaneous combustion, smoke, and the like due to instability of electric energy storage and release processes, safety of a battery circuit, and the like. This requires that the vehicle manufacturer must make a very careful selection of electrical components. The auto cable is the indispensable accessory of new energy automobile and the use amount is big, and the current-carrying capacity of auto cable directly influences new energy automobile's whole security performance. At present, the current carrying capacity problem of the automobile cable is frequently questioned by the manufacturers of the whole automobile. The current carrying capacity and safety of automotive cables during overload have plagued many design engineers from automotive manufacturers. Current capacity measurements of automotive cables and the maximum temperature rise of the conductor upon overload are presented on a schedule.
At present, in the automobile manufacturing industry, the following two mainstream test methods for measuring the current-carrying capacity of an automobile cable and the maximum temperature rise of a conductor during overload are available:
one is a testing method based on VW60306-3 by the German masses group, and the basic principle is as follows: since the current carrying conductor is inside the cable, its actual temperature cannot be measured accurately. According to the relation between resistance and temperature, different temperature conductor resistance tests are firstly carried out (bridge and silicon oil bath method), the temperature coefficient of the conductor is deduced by measuring the actual resistance value of the cable conductor at different temperatures (according to the current standard, the temperature coefficient K in the room temperature range is a linear coefficient, which is abbreviated as Rt ═ R20 ═ 1+ K (t-20)), but at high temperature, the temperature coefficient is a secondary parameter Rt ═ R20 [ (1+ a (t-20) + b (t-20) ]2) A is a primary temperature coefficient, and b is a secondary temperature coefficient. The actual temperature of the conductor can be deduced from the measured actual resistance value.
The resistance is calculated by testing the voltage and current values of the electric wire and the cable in the air which has certain temperature, is relatively stable and does not have forced circulation, and the actual temperature of the cable conductor is calculated by the one-to-one correspondence relationship between the temperature and the resistance, so that a temperature difference delta T (a I + b I) is obtained2The calculation equation of (2). Finally obtaining rated current carrying under delta T according to an equationThe quantity can also correspond to the corresponding conductor temperature according to different current values.
However, the test method of the automobile cable is based on the design of the traditional automobile cable for the fuel automobile, and the test box body of the test method is a box body made of organic glass. Therefore, for the cable for the new energy automobile, the method has some technical defects.
1. Because organic glass's heat conductivity and heat resistance are relatively poor, especially to the great new energy automobile cable of car cable cross-sectional area, in the test process of cable, the calorific capacity of cable also can be bigger and bigger, can directly influence experimental ambient temperature's stability, and the test box of above-mentioned traditional structure does not have the function of controlling ambient temperature.
2. The test in the test method is that the traditional automobile cable has current-carrying capacity in a standard installation environment, but as the automobile cable, the laying space is extremely narrow, the periphery of the automobile cable is not only air, but also metal or other materials in many places, so that heat dissipation media are greatly different, and therefore the test box of the traditional automobile cable is used for testing the new energy cable, and the accuracy and the reliability of the test result are poor.
3. If the cable is laid around an engine compartment of the new energy automobile or under the installation environment such as the back of a battery, the temperature of the installation environment even exceeds the heat-resistant temperature grade of organic glass, so that the test data in the calculation formula are deviated.
4. Under the driving state of the new energy automobile, the current change of the automobile cable is large, and the current change is very large under the conditions of different speeds, ascending slopes, acceleration and the like. Automobile designers hope to obtain the change parameters and characteristics of the actual working temperature of the actually selected cable under the conditions of certain environmental temperature and change current so as to know the safety design margin of the automobile cable and the limit safety current of short-time thermal overload. And the temperature change of the cable under the condition of periodically changing current cannot be measured according to the periodically running current curve of the new energy automobile motor.
And secondly, the cables are tested according to IEC 60840 annex A rated voltage of more than 30kV (Um is 36kM) to 150kV (Um is 170kM), accessory test methods and requirements of the cables and accessories of the cables, and national wire and cable quality inspection center enterprise standard TICW 15-2012 single cable current-carrying capacity test method. At present, the test method can only carry out the test under the room temperature environment. Because of the adoption of thermocouple measurement, the method is particularly not suitable for testing the cables with the medium and small cross sections.
In summary, the technical problems existing when the new energy cable is tested by adopting the two existing mainstream test methods are as follows:
(1) the section of the cable is larger and larger, and the stability of the environment temperature is influenced by the heating of the current of the cable;
(2) the environmental temperature is high, and the organic glass material of the test box can not meet the requirement;
(3) the laying of car cable is not only in the air, more with metal, guard shield and other device contact or poling use, and the car space is narrow and small, and the actual radiating environment of cable is different with the test environment. The cable installation environment in the existing test method can not simulate the installation environment of the cable, and the referential performance of the test result is poor;
(4) current of the new energy automobile is not steady state when the new energy automobile operates, and is changed, limit conditions such as thermal overload can occur, and the existing testing device cannot simulate the situation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a test device for testing the current-carrying capacity of an automobile cable and the maximum temperature rise of a conductor during overload, which solves the problem that the conventional gasoline vehicle cable test device cannot be applied to a cable for a new energy automobile.
The invention is realized in this way, a test device for testing the current-carrying capacity of the automobile cable and the maximum temperature rise of the conductor during overload, which is characterized in that: including the thermostatic chamber, set up the thermostated container in the thermostatic chamber, the thermostated container includes detachable material simulation baffle and is used for installing the carrier of test cable, the material simulation baffle encloses and constitutes the case room, the carrier set up in the case room, install the temperature measurement original paper in the case room of thermostatic chamber and thermostated container.
The invention provides a technical scheme, which comprises a constant temperature room, wherein the constant temperature room can provide a stable environment temperature of 10-200 ℃. An incubator for eliminating forced air circulation is designed in the thermostatic house. The incubator comprises a movable carrying frame and a material simulation clapboard which can be disassembled and assembled through disassembly. According to different requirements of test environment and temperature, material simulation clapboards made of different materials can be installed and laid on the constant temperature box to simulate cable installation environments made of different materials, and mixing, assembling and combining can be carried out according to the proportion required by customers. The material simulation partition plate can also be used for blocking circulating hot air in the constant-temperature room and isolating heat radiation of a heat source in the constant-temperature room.
Through the design of the scheme, the scheme has the following advantages:
(1) the problem that the current-carrying capacity of a test cable is influenced by the change of environmental temperature is solved;
(2) the high environmental temperature requirement is met by simulating the partition plate through replaceable modularized materials;
(3) the replaceable modularized material simulation partition plate can be used according to the requirements of customers, and the environment medium can be replaced at will;
(4) the size of the box chamber of the thermostat can be adjusted by adjusting the installation position of the modularized material simulation partition plate, so that the thermostat is more in line with the actual laying environment of the cable for the new energy automobile;
in the above technical solution, preferably, the incubator includes a box frame, and the material simulation partition is detachably mounted on the box frame.
In the above technical solution, preferably, the material simulation partition plate is a cast iron plate, a stainless steel plate, an aluminum plate, organic glass, a high temperature resistant glass plate or a high temperature resistant plastic rubber plate with a consistent size.
In the above technical solution, preferably, the carrier is a rigid frame with support legs, a cable hanging ring is installed on an inner side of the rigid frame, and the carrier is inserted in the box chamber in a drawer type.
In the above technical solution, preferably, the constant temperature room is a heated air circulation constant temperature room.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view showing the construction of an incubator according to the present invention;
FIG. 3 is a schematic view of the construction of the carrier of the present invention;
fig. 4 is a schematic view of the connection structure of the test cable according to the present invention.
In the figure, 1, a constant temperature room; 2. a thermostat; 2-1, a box frame; 3. a material simulation clapboard; 4. a carrier; 5. testing the cable; 6. testing the power supply; 7. a recorder; 8. a current sensor; 9. a potentiometer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention particularly provides a test device for testing the current-carrying capacity of an automobile cable and the maximum temperature rise of a conductor during overload, which can simulate the cable working environment of a new energy automobile so as to ensure that the cable measurement result is better, accurate and reliable. To further illustrate the structure of the present invention, the following detailed description is made with reference to the accompanying drawings:
referring to fig. 1-4, a testing apparatus for testing the current-carrying capacity of an automotive cable and the maximum temperature rise of a conductor during overload includes a constant temperature room 1, wherein the constant temperature room 1 is a commercial constant temperature room heated by hot air circulation, and an environment with forced hot air circulation is arranged inside the constant temperature room 1. In this embodiment, each parameter index of the constant temperature room is:
1) the temperature fluctuation degree is less than or equal to +/-0.5 ℃;
2) the analytical precision of the instrument is 0.1 ℃;
3) temperature no-load deviation is +/-3% ° c;
4) temperature rise and fall rate: 1-5 ℃/min;
5) one threading hole is reserved, and one observation window is reserved;
6) the inner wall of the box body is made of stainless steel.
Set up thermostated container 2 in the thermostatic chamber 1, thermostated container 2 includes detachable material simulation baffle 3 and is used for installing test cable's carrier 4, and material simulation baffle 3 encloses and constitutes the case room. The carriage 4 is disposed in the cabinet. In this embodiment, the incubator 2 includes a casing frame 2-1, and the material simulation partition plate 3 is detachably mounted on the casing frame 2-1. The material simulation partition plate 3 is a cast iron plate, a stainless steel plate, an aluminum plate, organic glass, a high-temperature resistant glass plate or a high-temperature resistant plastic rubber plate with the same size. The box body frame 2-1 is a hexahedral frame structure with supporting legs, the material simulation partition plates 3 are rectangular plate structures, and can be directly fixed on the box body frame 2-1 by using screws, and inserting seams for inserting the material simulation partition plates 3 can also be formed on the box body frame 2-1.
The carrier 4 is a rigid frame with legs, the inner side of the rigid frame is provided with cable hanging rings, and the carrier 4 is inserted into the box chamber in a drawer type. The carrier 4 is a frame body formed by welding straight rods, is also provided with inserting seams and can be provided with material simulation clapboards according to the requirement. The cable hanging ring is a heat-resistant rubber material hanging ring with low heat conductivity coefficient, the test cable 5 is hung on the cable hanging ring in an S-shaped loop shape, and a frame body part used for supporting the leading-out section of the test cable is arranged at the front part of the carrying frame 4. The leading-out end of the test cable 5 is connected with test equipment such as a test power supply 6, a recorder 7, a current sensor 8, a potentiometer 9 and the like.
Temperature measuring elements are arranged in the constant temperature room and the chamber of the constant temperature box, and the temperature measuring elements are thermocouples.
The test method using the device comprises the following steps:
step 1: and taking a test cable sample, and testing a quadratic curve equation of the resistance and the temperature of the cable conductor.
The temperature change curve of the cable conductor can be measured by adopting a commercially available conductor resistance testing bridge and a silicone oil bath box for constant temperature. The process is briefly described as follows: the cable, the length of which was measured in advance, was immersed in a silicon oil bath, which was heated to a predetermined temperature, and the resistance value was measured. And through setting different temperature points, a quadratic curve equation of the resistance and the temperature is obtained through multi-point measurement.
Step 2: the voltage and current values of the cable pattern were measured using the present device.
Laying the cable style in the thermostated container, external constant current source, insert voltmeter and current measurement sensor at wiring both ends, set for the constant temperature room temperature, the temperature adopts VW60306 specified temperature, makes the thermostated container stabilize to specified temperature value, begins to let in the electric current in the cable style, measures voltage and current value after stabilizing, increases the electric current and carries out the test of next bit. And after the measurement value is obtained, a primary parameter a and a secondary parameter b are obtained through calculation, and derating curve data are obtained.
And step 3: and continuously increasing the electrified current of the test cable, increasing the temperature of the conductor, and measuring the relationship between the current and the temperature when the heat is overloaded.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The utility model provides a test device of the biggest temperature rise of conductor when test car cable current-carrying capacity and transship which characterized in that: including thermostated chamber (1), set up thermostated container (2) in thermostated chamber (1), thermostated container (2) include detachable material simulation baffle (3) and are used for installing carrier (4) of test cable, material simulation baffle (3) enclose and constitute the case room, carrier (4) set up in the case room, install the temperature measurement original paper in the case room of thermostated chamber (1) and thermostated container (2).
2. The test device for testing the current-carrying capacity and the maximum temperature rise of the conductor during overload of the automobile cable according to claim 1, which is characterized in that: the constant temperature box (2) comprises a box body framework (2-1), and the material simulation partition plate (3) is detachably mounted on the box body framework (2-1).
3. The test device for testing the current-carrying capacity and the maximum temperature rise of the conductor during overload of the automobile cable according to claim 2, characterized in that: the material simulation partition plate (3) is a cast iron plate, a stainless steel plate, an aluminum plate, organic glass, a high-temperature resistant glass plate or a high-temperature resistant plastic rubber plate with the same size.
4. The test device for testing the current-carrying capacity and the maximum temperature rise of the conductor during overload of the automobile cable according to claim 1, which is characterized in that: the carrier (4) is a rigid frame with supporting legs, a cable hanging ring is installed on the inner side of the rigid frame, and the carrier (4) is inserted into the box chamber in a drawer mode.
5. The test device for testing the current-carrying capacity and the maximum temperature rise of the conductor during overload of the automobile cable according to claim 1, which is characterized in that: the constant temperature room (1) is a hot air circulation constant temperature room.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110418341.0A CN112964311A (en) | 2021-04-19 | 2021-04-19 | Test device for testing current-carrying capacity of automobile cable and maximum conductor temperature rise during overload |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110418341.0A CN112964311A (en) | 2021-04-19 | 2021-04-19 | Test device for testing current-carrying capacity of automobile cable and maximum conductor temperature rise during overload |
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| CN112964311A true CN112964311A (en) | 2021-06-15 |
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| CN202110418341.0A Pending CN112964311A (en) | 2021-04-19 | 2021-04-19 | Test device for testing current-carrying capacity of automobile cable and maximum conductor temperature rise during overload |
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|---|---|---|---|---|
| CN101281226A (en) * | 2008-05-27 | 2008-10-08 | 保定天威集团有限公司 | Conducting wire great current impact test method |
| CN104374493A (en) * | 2014-11-03 | 2015-02-25 | 金杯电工衡阳电缆有限公司 | High-capacity charging cable intermittent load test method |
| CN105548759A (en) * | 2015-12-18 | 2016-05-04 | 烟台金润消防工程有限公司 | Cable current carrying capacity testing device and method |
| CN107192918A (en) * | 2017-05-29 | 2017-09-22 | 西南交通大学 | Vehicle-mounted cable termination leakage current testing System and method at a temperature of particular surroundings |
| CN110018350A (en) * | 2019-04-26 | 2019-07-16 | 中辰电缆股份有限公司 | A kind of conductor DC resistance quick, intelligent measuring system online |
| CN111239532A (en) * | 2020-03-11 | 2020-06-05 | 远东电缆有限公司 | Copper-aluminum cable current-carrying capacity and temperature rise testing method |
-
2021
- 2021-04-19 CN CN202110418341.0A patent/CN112964311A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281226A (en) * | 2008-05-27 | 2008-10-08 | 保定天威集团有限公司 | Conducting wire great current impact test method |
| CN104374493A (en) * | 2014-11-03 | 2015-02-25 | 金杯电工衡阳电缆有限公司 | High-capacity charging cable intermittent load test method |
| CN105548759A (en) * | 2015-12-18 | 2016-05-04 | 烟台金润消防工程有限公司 | Cable current carrying capacity testing device and method |
| CN107192918A (en) * | 2017-05-29 | 2017-09-22 | 西南交通大学 | Vehicle-mounted cable termination leakage current testing System and method at a temperature of particular surroundings |
| CN110018350A (en) * | 2019-04-26 | 2019-07-16 | 中辰电缆股份有限公司 | A kind of conductor DC resistance quick, intelligent measuring system online |
| CN111239532A (en) * | 2020-03-11 | 2020-06-05 | 远东电缆有限公司 | Copper-aluminum cable current-carrying capacity and temperature rise testing method |
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