CN106443230B - Thermal shock test system and method for outdoor current-carrying hardware in power transmission project - Google Patents
Thermal shock test system and method for outdoor current-carrying hardware in power transmission project Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 183
- 230000035939 shock Effects 0.000 title claims abstract description 39
- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 19
- 239000005457 ice water Substances 0.000 claims abstract description 94
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000005507 spraying Methods 0.000 claims abstract description 52
- 239000000203 mixture Substances 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000004891 communication Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 27
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 20
- 238000013461 design Methods 0.000 abstract description 9
- 230000008646 thermal stress Effects 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000005336 cracking Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 244000137852 Petrea volubilis Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
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Abstract
The invention discloses a thermal shock test system for outdoor current-carrying hardware in a power transmission project, which comprises a hardware heating assembly and an ice water spraying assembly, wherein the test hardware heating assembly comprises a voltage-regulating current booster, a current transformer and a test hardware, and a conductive communication circuit is established by the test hardware heating assembly through a conducting wire. The ice water spraying assembly comprises an ice water tank, a water inlet pipe, a spraying pipe, a water outlet pipe and a test water tank. The invention fully considers the influence of the heating mode and the cooling speed on the thermal fatigue characteristic of the outdoor through-flow fitting of the power transmission project, provides a thermal shock test design principle combining through-flow heating and spraying ice-water mixture cooling, better accords with the actual operation condition of the outdoor through-flow fitting of the power transmission project, can effectively guide the development of the thermal fatigue characteristic test of the outdoor through-flow fitting of the power transmission project and the design of the through-flow fitting, and prevents the through-flow fitting from cracking and damaging due to the continuous accumulation of internal thermal stress in an extreme cold-hot alternating environment.
Description
Technical Field
The invention relates to the field of detection, in particular to a thermal shock test system and method for an outdoor current-carrying hardware fitting for power transmission engineering.
Background
The current through-flow fittings of transformer stations and convertor stations in the power transmission and transformation project of China usually consist of indoor and outdoor areas, the natural environment of the areas where part of project sites are located is severe at present, the weather is cold in winter, and the extreme temperature can reach-42 ℃. The low temperature environment can have a severe impact on the metal material. For through-flow fittings of substations and converter stations which operate under extremely cold air temperature conditions, particularly outdoor through-flow fittings, rapid temperature rise is easily caused after current is supplied, but because the external environment temperature is not constant, the temperature of the through-flow fittings is easily and repeatedly changed sharply when the through-flow fittings are under extremely low temperature conditions. When constrained, expansion and contraction due to rapid changes in temperature can create thermal stresses within the part. The temperature of the through-flow fitting repeatedly changes, and the thermal stress also repeatedly changes, so that the material is subjected to fatigue damage. The operation environment temperature of the prior engineering is between-30 ℃ and-40 ℃, and if the corresponding through-current fitting, particularly the outdoor through-current fitting, is directly applied to the power transmission and transformation station engineering, huge hidden dangers exist, and the safe and stable operation of a power grid is seriously influenced.
The prior art adopts a method for detecting and evaluating the thermal fatigue and aging characteristics of electric splicing fittings of power transmission lines in China, adopts current to heat, finishes the heating process after the fittings reach constant temperature for 30 minutes, and cuts off the current to cool. In order to shorten the cooling time of the hardware fitting, forced cooling is allowed. In actual damage of the prior art, compressed air is adopted to perform forced cooling on the hardware. However, the cooling speed provided by the method is relatively slow, and has a large difference with the actual working condition of rapid cooling of the outdoor through-flow fitting after the actual shutdown, so that the test is difficult to perform according to the actual working condition.
Disclosure of Invention
In order to solve the problems, the invention provides a system which comprises a hardware heating assembly and an ice water spraying assembly, wherein the test hardware heating assembly comprises a voltage regulating current booster, a current transformer and a test hardware, and the test hardware, the current transformer and the voltage regulating current booster establish a conductive connection circuit through a wire; the ice water spraying assembly comprises an ice water tank, a water inlet pipe, a spraying pipe, a water outlet pipe and a test water tank; the test hardware is placed in the test water tank.
Preferably, the ice-water tank is filled with an ice-water mixture, the ice-water mixture is pumped into the water inlet pipe and flows into the spray pipe, and the ice-water mixture passes through the spray pipe and is uniformly sprayed on the surface of the experimental hardware.
Preferably, the spray pipe is provided with a regulating device, and the speed of spraying the ice-water mixture is regulated, so that the temperature reduction time and amplitude of the experimental hardware are controlled.
Preferably, the temperature measuring device is arranged in the test hardware fitting, the water inlet pipe, the water outlet pipe, the test water tank and the ice water tank.
According to yet another aspect of the invention, there is provided a method comprising:
establishing a test hardware heating assembly, wherein the test hardware heating assembly comprises a voltage regulating current booster, a current transformer and a test hardware, and the test hardware, the current transformer and the voltage regulating current booster establish a conductive communication circuit through a wire; establishing a communication line by utilizing electric conduction to heat the test hardware fitting;
establishing an ice water spraying assembly, wherein the ice water spraying assembly comprises an ice water tank, a water inlet pipe, a spraying pipe, a water outlet pipe and a test water tank; the test hardware fitting is placed in the test water tank;
and carrying out a spraying cooling experiment, wherein an ice-water mixture is arranged in the ice-water tank, the ice-water mixture is pumped into the water inlet pipe and flows into the spraying pipe, and the ice-water mixture is uniformly sprayed on the surface of the experimental hardware fitting through the spraying pipe.
Preferably, the spray pipe is provided with a regulating device, and the speed of spraying the ice-water mixture is regulated, so that the temperature reduction time and amplitude of the experimental hardware are controlled.
Preferably, the temperature measuring device is arranged in the test hardware fitting, the water inlet pipe, the water outlet pipe, the test water tank and the ice water tank.
According to the implementation mode of the invention, the influence of the heating mode and the cooling speed on the thermal fatigue characteristic of the outdoor through-flow fitting of the power transmission project is fully considered, and the thermal shock test design principle of the combination of through-flow heating and spraying of ice-water mixture cooling is provided.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a structural diagram of a thermal shock test system of an outdoor current-carrying hardware fitting in a power transmission project according to an embodiment of the invention; and
fig. 2 is a flow chart of a thermal shock test method for outdoor current-carrying hardware in power transmission engineering according to another embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a structural diagram of a thermal shock test system of an outdoor current-carrying hardware fitting in a power transmission project according to an embodiment of the invention. The system 100 provided by the embodiment of the invention is used for testing the thermal shock of the outdoor through-current fitting, so that the actual operation condition of the outdoor through-current fitting in a power transmission project is better met, and the preparation and the reasonability of the thermal shock characteristic test of the fitting are ensured. The system 100 controls the cooling time of the test hardware fitting by adjusting the speed of spraying the ice-water mixture, so that the test can be conveniently and smoothly carried out. The implementation mode of the invention provides reliable basis for the design and maintenance of the outdoor through-current hardware fitting of the power transmission project.
As shown in fig. 1, the system comprises a hardware heating assembly and an ice water spraying assembly, wherein the test hardware 5 heating assembly comprises a voltage regulating current booster 1, a current transformer 2 and a test hardware 5, and the heating assembly establishes a conductive communication circuit through a wire. The ice water spraying assembly comprises an ice water tank 8, a water inlet pipe 6, a spraying pipe 3, a water outlet pipe 7 and a test water tank 4. The test hardware 5 is placed in the test water tank 4. Preferably, the test hardware fitting 5 is subjected to surface treatment, surface dirt and an oxide layer are removed by sanding with sand paper, and the surface after sanding is cleaned with an organic solvent and is wiped clean and dried. Before the test is started, the test loop is subjected to through-flow debugging, and the operating parameters such as voltage, current, temperature, phase angle and frequency are determined to be kept in a normal state. Preferably, the spraying assembly comprises an ice water tank 8, a water inlet pipe 6, a spraying pipe 3, a water outlet pipe 7, a test water tank 4, a test support frame and a water suction pump. The water inlet pipe 6 and the water outlet pipe 7 are connected in the ice water tank 8, the ice water mixture is recycled, the ice water mixture can be continuously added into the ice water tank 8, and the temperature change of the ice water mixture in the ice water tank 8 is not more than 1 ℃. Before the test, the spraying assembly is debugged, the smoothness of the water inlet pipe 6, the water outlet pipe 7 and the spraying pipe 3 is determined, and the spraying speed and the spraying range are ensured to be kept in a normal state. The test hardware fitting 5 is placed at the upper part of the center of the test water tank 4 in the spray assembly, the test hardware fitting 5 is not contacted with the test water tank 4, and the test hardware fitting 5 and a device in the spray assembly need to be arranged in a necessary insulation mode so as to ensure that the device of the spray assembly is insulated from the test hardware fitting 5. Meanwhile, when the test loop is arranged, in order to facilitate the test, other connecting pieces of the test hardware fitting 5 in the test loop should be kept at a certain distance. The test was conducted in an unventilated environment at a temperature range of 15 to 30 ℃. Temperature measuring devices are arranged on the surface of the test hardware fitting 5, the water inlet pipe 6, the water outlet pipe 7, the test water tank 4 and the ice water tank 8.
Preferably, in the test, a high-voltage current booster is adopted to adjust high voltage to low voltage, and current is boosted through the current transformer 2. Before a thermal shock test of a test hardware fitting 5 is carried out, the voltage-regulating current booster 1 and the current transformer 2 are firstly subjected to test operation to check that the device is in a normal state. If the hardware heating assembly device is found to be abnormal in operation in the test run operation, the device needs to be stopped and overhauled. In the test process, the voltage-regulating current booster 1, the current transformer 2 and the test hardware fitting 5 are connected by using a lead, a drainage plate and a bolt to form a conductive path, the current is determined by the designed current density value of the test hardware fitting 5, and the test hardware fitting 5 is placed in the test water tank 4. And (3) switching on a power supply, passing current through the conductive path, testing the temperature of the hardware by using a temperature measuring device, and switching off the power supply after the temperature of the test hardware 5 is uniform and constant and the temperature is required to be kept uniform and constant for 50 minutes. When the spraying preparation is carried out, the spraying assembly is subjected to commissioning operation so as to check whether the device is in a normal state. If the spraying assembly device is found to be abnormally operated in the test operation, the device needs to be stopped and overhauled. And adding an ice-water mixture into the ice-water tank 8, wherein ice blocks are fine particles and have uniform sizes, so that the water inlet pipe 6 can suck and the spray pipe 3 can spray. The water storage capacity in the ice water tank 8 should be such as to provide the amount of ice water mixture to be used in at least one thermal shock cycle trial. During spraying, firstly, the water pump is used for pumping the ice-water mixture in the ice-water tank 8 into the water inlet pipe 6, the ice-water mixture flows into the spraying pipe 3 through the water inlet pipe 6 and is continuously and uniformly sprayed on the surface of the test hardware fitting 5, so that the test hardware fitting 5 is rapidly cooled, and meanwhile, in the test process, the water pump is used for pumping accumulated water in the test water tank 4 out to the ice-water tank 8 through the water outlet pipe 7, so that the purpose of recycling is achieved. The ice water tank 8 is provided with a cooling device to ensure that the ice water mixture in the ice water tank 8 is in a state that the maximum temperature is not more than 5 ℃, and new ice water mixture can be added in the test process. Temperature measuring devices are arranged in the water inlet pipe 6, the water outlet pipe 7 and the ice water tank 8 and used for detecting the water temperature of each position so as to ensure that the test hardware fitting 5 can be completely cooled in the stage of spraying the ice-water-cooled mixture. The spray pipe 3 is provided with an adjusting device, and the temperature reduction time and amplitude of the experimental hardware fitting are controlled by adjusting the speed of spraying the ice-water mixture. Each thermal shock cycle comprises a through-flow heating process for the test loop and a spray cooling process for cutting off the current for the test hardware 5.
And after 10 times of thermal shock circulation, drying the surface of the test hardware fitting 5, detecting whether cracks appear on the surface of the test hardware fitting 5 by adopting a manual visual inspection method or an ultrasonic nondestructive detection method, and stopping the test if obvious cracks appear on the surface of the test hardware fitting 5. The thermal shock cycle number corresponding to the previous test is the thermal shock life of the test hardware 5. If the surface of the test hardware 5 has no cracks, the test is continued until the thermal shock frequency of the test hardware 5 reaches the specified 100 times, and the test is stopped. If the thermal shock service life of the test hardware 5 is higher than the specified times, the test hardware 5 is judged to have higher thermal fatigue resistance and good environmental adaptability and can be applied to the outdoor cold-hot alternating environment. And if the thermal shock service life of the test hardware 5 is lower than the specified times, judging that the thermal fatigue resistance of the test hardware 5 does not meet the design requirement.
FIG. 2 is a flowchart of a thermal shock test method of the outdoor current-carrying hardware according to the embodiment of the invention. As shown in fig. 2, the test method 200 is used to test outdoor through-current hardware thermal shock. The method 200 provided by the embodiment of the invention is used for testing the thermal shock of the outdoor through-current fitting, so that the actual operation condition of the outdoor through-current fitting in a power transmission project is better met, and the preparation and the rationality of the thermal shock characteristic test of the fitting are ensured. The method 200 controls the cooling time of the test hardware fitting by adjusting the speed of spraying the ice-water mixture, so that the test can be conveniently and smoothly carried out. The implementation mode of the invention provides reliable basis for the design and maintenance of the outdoor through-current hardware fitting of the power transmission project.
Preferably, the test method 200 begins at step 201. Step 201, a platform for carrying out a thermal shock test on the outdoor current-carrying hardware fitting in the power transmission project is built, and the building of the test platform comprises the following steps: and establishing a test loop comprising the drainage plate and the test hardware fitting. Establishing an ice water spraying assembly; and debugging the test loop and the ice water spraying assembly. Preferably, the test hardware is subjected to surface treatment, surface dirt and an oxide layer are removed by polishing with sand paper, and the surface after polishing is cleaned with an organic solvent and is wiped clean and dried. The joint of the test hardware and the drainage plate is coated with the conductive paste, the test hardware and the drainage plate are connected through bolts, and the conductive paste is conductive paste with good chemical and temperature stability. Before the test is started, the test loop is subjected to through-flow debugging, and the operating parameters such as voltage, current, temperature, phase angle and frequency are determined to be kept in a normal state. The spraying assembly comprises an ice water tank, a water inlet pipe, a spraying pipe, a water outlet pipe, a test water tank, a test support frame and a water suction pump. The water inlet pipe and the water outlet pipe are connected in the ice water tank, the ice water mixture is recycled, the ice water mixture can be continuously added into the ice water tank, and the temperature change of the ice water mixture in the ice water tank is not more than 1 ℃. Before the test, the spraying assembly is debugged, smoothness of the water inlet pipe, the water outlet pipe and the spraying pipe is determined, and the spraying speed and the spraying range are guaranteed to be kept in a normal state. The test hardware fitting is placed at the upper part of the center of the test water tank in the spray assembly, the test hardware fitting is not contacted with the test water tank, and the test hardware fitting and a device in the spray assembly need to be arranged in a necessary insulating mode so as to ensure that the device of the spray assembly is insulated from the test hardware fitting. Meanwhile, when the test loop is arranged, other connecting pieces of the test hardware fitting in the test loop are required to keep a certain distance for convenience of test. The test was conducted in an unventilated environment at a temperature range of 15 to 30 ℃. And the temperature measuring device is arranged on the surface of the test hardware fitting, the water inlet pipe, the water outlet pipe, the test water tank and the ice water tank.
Preferably, a thermal shock test is performed, the thermal shock test process comprising: through-flow heating is carried out on the test hardware fitting through a test loop, and cutoff cooling is carried out after the temperature of the test hardware fitting is uniform and constant; spraying an ice water mixture to the test hardware fitting through the spraying assembly, so that the test hardware fitting is rapidly cooled; the thermal shock test was repeated 10 times. When the test of the embodiment of the invention is implemented, the test hardware is subjected to through-flow heating, and the current magnitude is determined by the current density design value of the test hardware. After the test hardware is uniformly and constantly heated by the through flow, the state of uniform and constant temperature needs to be kept for 50 minutes. The ice-water mixture is added into the ice-water tank in the spray assembly, and the ice particles are uniform. The water storage capacity of the ice water tank is such as to supply the amount of ice water mixture used in at least one thermal shock cycle. When the test hardware is cooled in a cutoff mode, under the action of a water pump, the water inlet pipe sucks in ice-water mixture, and the ice-water mixture is continuously and uniformly sprayed on the surface of the test hardware through the spraying pipe, so that the test hardware is rapidly cooled for 10 minutes. And the ice-water mixture for cooling the test hardware fitting flows into the test water tank and flows into the ice-water tank through the water outlet pipe. The embodiment of the invention adopts the temperature measuring device to respectively monitor the water temperatures of the water inlet and the water outlet of the water tank, and adds new ice-water mixture in the test process, so that the water temperature in the water tank does not change more than 1 ℃. According to the embodiment of the invention, the cooling speed of the test hardware fitting can be controlled by adjusting the flow of the sprayed ice-water mixture. Each thermal shock cycle comprises a through-flow heating process for the test loop and a spray cooling process for cutting off the current of the test hardware.
Preferably, after 10 times of thermal shock cycles, the surface of the test hardware is dried, whether cracks appear on the surface of the test hardware is detected by adopting a manual visual inspection method or an ultrasonic nondestructive detection method, and if obvious cracks appear on the surface of the test hardware, the test is stopped. The thermal shock cycle frequency corresponding to the previous test is the thermal shock service life of the test hardware. And if the surface of the test hardware has no cracks, continuing the test until the thermal shock frequency of the test hardware reaches the specified 100 times, and stopping the test. If the thermal shock service life of the test hardware is higher than the specified times, the test hardware is judged to have higher thermal fatigue resistance and good environmental adaptability and can be applied to the environment of outdoor cold-hot alternate transformation. And if the thermal shock service life of the test hardware is lower than the specified times, judging that the thermal fatigue resistance of the test hardware does not meet the design requirement.
According to the implementation mode of the invention, the influence of the heating mode and the cooling speed on the thermal fatigue characteristic of the outdoor through-flow fitting of the power transmission project is fully considered, and the thermal shock test design principle of the combination of through-flow heating and spraying of ice-water mixture cooling is provided.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (5)
1. A thermal shock test system for outdoor current-carrying hardware in power transmission engineering comprises a test hardware heating assembly and an ice water spraying assembly, wherein the test hardware heating assembly comprises a voltage-regulating current booster, a current transformer and a test hardware, the current transformer and the voltage-regulating current booster establish a conductive connecting circuit through a conducting wire, and the conductive connecting circuit is used for heating the test hardware; the ice water spray assembly comprises: the device comprises an ice water tank, a water inlet pipe, a spray pipe, a water outlet pipe and a test water tank, wherein the ice water tank is used for placing ice water mixture;
the test hardware fitting is placed in the test water tank, the ice-water mixture is pumped into the water inlet pipe and then flows into the spray pipe, and the ice-water mixture is uniformly sprayed on the surface of the test hardware fitting through the spray pipe; the spray pipe is provided with an adjusting device, and the temperature reduction time and amplitude of the experimental hardware fitting are controlled by adjusting the speed of spraying the ice-water mixture.
2. The system of claim 1, wherein the ice-water tank is filled with an ice-water mixture, the ice-water mixture is pumped into the water inlet pipe and flows into the spray pipe, and the ice-water mixture passes through the spray pipe and uniformly sprays the surface of the experimental hardware in the experimental water tank.
3. The system of claim 1, wherein the temperature measuring device is arranged in the test hardware fitting, the water inlet pipe, the water outlet pipe, the test water tank and the ice water tank.
4. A thermal shock test method for outdoor current-carrying hardware in power transmission engineering comprises the following steps:
establishing a test hardware heating assembly, wherein the test hardware heating assembly comprises a voltage regulating current booster, a current transformer and a test hardware, and the test hardware, the current transformer and the voltage regulating current booster establish a conductive communication circuit through a wire; heating the test hardware by using the conductive communication line;
establishing an ice water spraying assembly, wherein the ice water spraying assembly comprises an ice water tank, a water inlet pipe, a spraying pipe, a water outlet pipe and a test water tank; placing the test hardware in the test water tank;
placing an ice-water mixture in the ice-water tank, pumping the ice-water mixture into the water inlet pipe, and then flowing into the spray pipe, wherein the ice-water mixture is uniformly sprayed on the surface of the experimental hardware fitting through the spray pipe; the spray pipe is provided with an adjusting device, and the temperature reduction time and amplitude of the experimental hardware fitting are controlled by adjusting the speed of spraying the ice-water mixture.
5. The method of claim 4, wherein a temperature measuring device is installed in the test hardware, the water inlet pipe, the water outlet pipe, the test water tank and the ice water tank.
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| CN201610712170.1A CN106443230B (en) | 2016-08-23 | 2016-08-23 | Thermal shock test system and method for outdoor current-carrying hardware in power transmission project |
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| CN102116724A (en) * | 2011-01-11 | 2011-07-06 | 中国第一汽车集团公司 | Test method for thermal fatigue property of cast iron material |
| CN102866076A (en) * | 2012-08-14 | 2013-01-09 | 哈尔滨工业大学 | Conductive-type thermal-protection material cold/hot circulating thermal shock test apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116724A (en) * | 2011-01-11 | 2011-07-06 | 中国第一汽车集团公司 | Test method for thermal fatigue property of cast iron material |
| CN102866076A (en) * | 2012-08-14 | 2013-01-09 | 哈尔滨工业大学 | Conductive-type thermal-protection material cold/hot circulating thermal shock test apparatus |
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| Title |
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| 微连接接头在热疲劳过程中的破坏规律;林建 等;《焊接学报》;20091130;第30卷(第11期);第65-68、72页：第68页左栏 * |
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