CN112763170A - System and method for detecting vibration resistance of superconducting cable - Google Patents
System and method for detecting vibration resistance of superconducting cable Download PDFInfo
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- CN112763170A CN112763170A CN202011523827.2A CN202011523827A CN112763170A CN 112763170 A CN112763170 A CN 112763170A CN 202011523827 A CN202011523827 A CN 202011523827A CN 112763170 A CN112763170 A CN 112763170A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The invention relates to a system and a method for detecting vibration resistance of a superconducting cable, wherein the system comprises a vibration table and a sensor assembly, the vibration table is connected with one end of the superconducting cable, the sensor assembly is fixed on the superconducting cable, the sensor assembly comprises an acceleration sensor, a displacement sensor and a strain gauge, the acceleration sensor and the displacement sensor are fixed on the outer side of a superconducting cable heat insulation sleeve, the strain gauge is arranged on a welding seam of the superconducting cable, and the vibration table and the sensor assembly are connected with a controller. Compared with the prior art, the method can be used for detecting the vibration resistance of the superconducting cable.
Description
Technical Field
The invention relates to the technical field of vibration detection of power equipment, in particular to a system and a method for detecting vibration resistance of a superconducting cable.
Background
The High-Temperature Superconducting (HTS) cable is a leading-edge technology, and the construction and operation of the Superconducting cable are continuously mature and have the reliability of grid-connected operation as can be seen from the operation effect of the demonstration engineering of the Superconducting cables of all countries in the world. The superconducting cable is in the stage of hanging net demonstration and a small amount of commercial application on a global scale, and related test and operation standards facing the superconducting cable are not available on an international scale.
The superconducting cable can be influenced by the vibration factors of the surrounding environment in the running process, the superconducting cable close to the subway track can be influenced by the vibration of the subway for a long time, the superconducting cable near a removed house can be influenced by the vibration of a pile, the superconducting cable laid on a bridge can be influenced by the vibration of vehicles such as automobiles and the like, and the superconducting cable laid on the bottom of a river bed can also be influenced by the water flow impact at different times. In special cases, such as external force damage, house removal, foundation building and even earthquake, the vibration influence on the environment is not negligible. The vibration may cause structural changes of the superconducting cable, and the long-term vibration environment may cause structural abnormalities of the superconducting cable, amplify the effect of defects inside the insulating material of the superconducting cable, generate a partial discharge phenomenon, and further cause damage to the entire system.
At present, a system and a method for detecting the vibration resistance of the superconducting cable are lacked.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a system and a method for detecting the vibration resistance of a superconducting cable.
The purpose of the invention can be realized by the following technical scheme:
a superconducting cable anti-vibration performance detection system comprises a vibration table and a sensor assembly, wherein the vibration table is connected with one end of a superconducting cable, the sensor assembly is fixed on the superconducting cable, the sensor assembly comprises an acceleration sensor, a displacement sensor and a strain gauge, the acceleration sensor and the displacement sensor are fixed on the outer side of a superconducting cable heat insulation sleeve, the strain gauge is arranged on a welding seam of the superconducting cable, and the vibration table and the sensor assembly are connected with a controller.
The superconducting cable fixing device further comprises a supporting body, wherein the supporting body supports the superconducting cable, the supporting body is provided with a lead groove, the shape of the lead groove is matched with that of the superconducting cable, and the superconducting cable is placed in the lead groove.
The supporting body is a cement column.
The acceleration sensor and the displacement sensor are arranged at intervals.
The acceleration sensor and the displacement sensor are arranged at equal intervals.
And the distance between the adjacent acceleration sensor and the displacement sensor is 175 cm.
The system also comprises a vacuum gauge, a helium mass spectrometer leak detector and a controllable voltage source, wherein the superconducting cable heat insulation sleeve is respectively connected with the vacuum gauge and the vacuum unit, the helium mass spectrometer leak detector is connected with an evacuation chamber of the vacuum unit, the controllable voltage source and the vacuum gauge are connected with a controller, and the controllable voltage source is connected with a core wire of the superconducting cable.
The superconducting cable heat insulation sleeve is respectively connected with the vacuum gauge and the vacuum unit through a three-way valve.
A method for testing a vibration resistance test system for a superconducting cable using the superconducting cable, the method comprising:
the superconducting cable is driven by the vibration table to vibrate;
the controller analyzes the dynamic performance of the superconducting cable according to signals of the acceleration sensor, the displacement sensor and the strain gauge;
recording the vacuum degrees of the superconducting cable before and after vibration by using a vacuum gauge, and analyzing the leakage and deflation performance of the superconducting cable;
and applying variable-frequency excitation voltage to the superconducting cable, measuring the voltage and current of the superconducting cable under the excitation voltage with different frequencies, and analyzing the insulation performance of the superconducting cable before and after vibration.
The process for analyzing the leakage and discharge performance of the superconducting cable comprises the following steps:
before vibration, the vacuum unit evacuates the superconducting cable insulation sleeve to below 0.01pa, and a helium mass spectrometer leak detector is used for detecting the leakage condition; disconnecting the helium mass spectrometer leak detector, stopping vacuumizing the vacuum unit, and recording the rising data of the vacuum degree before vibration by the vacuum gauge;
after vibration, the vacuum unit evacuates the superconducting cable insulation sleeve to below 0.01pa, the vacuum unit stops evacuating, and the vacuum gauge records the data of vacuum degree increase after vibration; and analyzing the leakage and deflation performance of the superconducting cable according to the data of the vacuum degree increase before vibration and the data of the vacuum degree increase after vibration.
Compared with the prior art, the invention has the following advantages:
(1) the vibration table is connected with one end of the superconducting cable, the sensor assembly is fixed on the superconducting cable, the sensor assembly comprises an acceleration sensor, a displacement sensor and a strain gauge, the acceleration sensor can be used for researching the fatigue performance of the superconducting cable, the displacement sensor can be used for researching the deformation performance of the superconducting cable, and the strain gauge can be used for researching the strength performance of the superconducting cable and effectively evaluating the vibration resistance of the superconducting cable.
(2) The system also comprises a vacuum gauge, a helium mass spectrometer leak detector and a controllable voltage source, can detect the leakage and deflation performance and the insulation performance of the superconducting cable, and perfects the detection of the vibration resistance of the superconducting cable.
Drawings
FIG. 1 is a schematic structural view of the present invention;
reference numerals:
1 is an acceleration sensor; 2 is a displacement sensor; 3 is a support body; 4 is a vibration table; and 5, a superconducting cable.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
The embodiment provides a superconducting cable anti-vibration performance detection system, which comprises a vibration table 4 and a sensor assembly, wherein the vibration table 4 is connected with one end of a superconducting cable 5, the sensor assembly is fixed on the superconducting cable 5, the sensor assembly comprises an acceleration sensor 1, a displacement sensor 2 and a strain gauge, the acceleration sensor 1 and the displacement sensor 2 are fixed on the outer side of a superconducting cable heat insulation sleeve, the strain gauge is arranged on a welding seam of the superconducting cable 5, and the vibration table 4 and the sensor assembly are connected with a controller.
Specifically, the method comprises the following steps:
the superconducting cable 5 may be supported by the support body 3, and the support body 3 may be provided with a lead groove having a shape corresponding to the shape of the superconducting cable 5, the superconducting cable 5 being placed in the lead groove; the support body 3 may be selected from a concrete column.
The acceleration sensor 1 and the displacement sensor 2 are arranged at equal intervals; the distance between the adjacent acceleration sensor 1 and the displacement sensor 2 is 175 cm.
The system also comprises a vacuum gauge, a helium mass spectrometer leak detector and a controllable voltage source, wherein the superconducting cable heat insulation sleeve is respectively connected with the vacuum gauge and the vacuum unit through a three-way valve, the helium mass spectrometer leak detector is connected with an evacuation chamber of the vacuum unit, the controllable voltage source and the vacuum gauge are connected with a controller, and the controllable voltage source is connected with a core wire of the superconducting cable 5.
The present embodiment also provides a method for detecting vibration resistance of a superconducting cable 5, including:
s1, fixing of superconducting cable 5 and arrangement of vibration table 4;
s2, applying vibration modes of different working conditions to the superconducting cable 5, testing the dynamic characteristics of the superconducting cable 5 during vibration by using the acceleration sensor 1, the displacement sensor 2 and the strain gauge, and analyzing the modal change condition of the superconducting cable;
s3, testing the vacuum degree of the superconducting cable 5 before and after vibration by using instruments such as a vacuum gauge, a helium mass spectrometer leak detector and the like, and analyzing the change condition of the vacuum degree;
s4, applying variable-frequency excitation voltage to the superconducting cable 5, calculating the capacitance and dielectric loss of the superconducting cable 5 by measuring the voltage and current of the superconducting cable 5 under the excitation of voltages with different frequencies, and giving the analysis conclusion of the insulation performance of the superconducting cable 5 before and after vibration.
The fixing method of the superconducting cable 5 in S1 is:
the center of mass of the structure of the superconducting cable 5 is positioned at the center of the whole detection system, the radius of the center of the detection system is limited to be 600mm, and the direction of the weak axis of the structure of the superconducting cable 5 is overlapped with the X direction of the vibration table 4 as much as possible, so that the test is carried out on the most adverse condition of the structure of the superconducting cable 5. The head of the superconducting cable 5 is fixed on the two-dimensional freedom degree vibration table 4, and the middle part and the tail part are respectively subjected to supporting and heightening treatment to be flush with the head.
The vibration table 4 of the present embodiment is driven by a servo motor, and has X, Y two-way two degrees of freedom. The modular array design is adopted, the modular array is composed of 4 sub-vibration tables, 1 large-scale vibration table can be spliced to perform the vibration resistance test of buildings or structures, and the vibration resistance test of bar-shaped structures such as bridges and tunnels can also be arranged in a straight shape at certain intervals.
The sensor arrangement method in S2 is as follows:
during vibration measurement, the acceleration sensor 1, the displacement sensor 2 and the strain gauge are arranged at equal intervals, and vibration displacement is an important basis for researching strength and deformation; the vibration acceleration is in direct proportion to the acting force or the load, is an important basis for researching the dynamic strength and the fatigue, and the acceleration sensor 1 is used for acquiring the vibration characteristics of the structure, such as the vibration frequency, the mode and the like.
Considering that the cable is made of a material with high strength and is not easy to deform, the strain gauge is a resistance strain gauge, and the strain gauge is used for measuring the strain of the welding seam in the vibration process so as to evaluate the strength.
The different vibration conditions in S2 include various vibration conditions represented by subway vibration, foundation piling vibration, typical earthquake vibration, and artificial wave vibration in the upper sea, and the parameterization of the vibration environment of the superconducting cable 5 is shown in table 1.
TABLE 1 vibration mode of superconducting cable
S3 specifically includes the following steps:
and S31, connecting the superconducting cable heat insulation sleeve with an evacuation valve, wherein the evacuation valve is respectively connected with a vacuum gauge and a vacuum unit through a three-way valve. The helium mass spectrometer leak detector is connected with an evacuation chamber of the vacuum unit.
S32 evacuating it with vacuum unit to 10 deg.C-2Pa or less
S33 line leak is detected with a helium mass spectrometer leak detector to ensure no detectable leak.
S34 disconnecting the leak detector by a gate valve;
and S35, when the vacuum degree is less than 0.01Pa, stopping evacuation, measuring the vacuum degree rise of the heat insulation pipe by using a vacuum gauge, and recording the vacuum degree change in real time so as to estimate the air leakage level of the heat insulation pipe.
S36 repeating S35, repeating the test for more than 5 times until the leakage air discharge reaches a stable level, and recording the leakage air discharge performance level.
S37 evacuates the cable again below 0.01Pa and closes the evacuation valve.
S38 cable simulated vibration test is performed.
S39 repeating S35 to obtain the leakage current performance level of the superconducting cable 5 after vibration and comparing with the value before vibration.
S4 specifically includes the following steps:
s41, applying variable-frequency (0.0001-1000 Hz) excitation voltage to the superconducting cable 5 before the controllable voltage source vibrates, measuring the voltage and current of the superconducting cable 5 under the excitation of different frequency voltages, and calculating the capacitance and dielectric loss of the superconducting cable 5.
S42 the controllable voltage source applies variable frequency (0.0001-1000 Hz) excitation voltage to the superconducting cable 5 after vibrating, measures the voltage and current of the superconducting cable 5 under the excitation of different frequency voltages, and calculates the capacitance and dielectric loss of the superconducting cable 5.
S43 compares the changes in capacitance and dielectric loss of the superconducting cable 5 under excitation voltages and currents of different frequencies before and after vibration, and determines the degree of influence of the superconducting cable 5 before and after vibration on the insulation performance.
In S4, IDAX-300 series automatic dielectric loss frequency characteristic tester IDAX-300 produced by Pax Diagnostics of Sweden can be used for insulation performance test, and IDAX-300 can integrate the functions of the controllable voltage source, the current meter and the voltmeter, can realize the measurement frequency range of 0.0001-1000 Hz, and belongs to the range of low frequency and medium frequency. And curve fitting is carried out by using MODS analysis software matched with IDAX-300, so that the change of the insulation performance of the superconducting cable 5 before and after vibration can be analyzed.
Compared with the prior art, the system and the method of the embodiment have the following advantages:
based on the simulation vibration table test, the superconducting cable vibration test method which takes dynamic parameters such as acceleration, vibration level, frequency and the like as control variables is adopted, test data are effectively obtained, and richer information than that of the traditional vibration test can be obtained by calculating and analyzing the performance change of the superconducting cable before and after vibration, so that the superconducting cable vibration performance can be comprehensively and effectively detected.
Claims (10)
1. The superconducting cable vibration resistance detection system is characterized by comprising a vibration table (4) and a sensor assembly, wherein the vibration table (4) is connected with one end of a superconducting cable (5), the sensor assembly is fixed on the superconducting cable (5), the sensor assembly comprises an acceleration sensor (1), a displacement sensor (2) and a strain gauge, the acceleration sensor (1) and the displacement sensor (2) are fixed on the outer side of a superconducting cable heat insulation sleeve, the strain gauge is arranged on a welding seam of the superconducting cable (5), and the vibration table (4) and the sensor assembly are connected with a controller.
2. A superconducting cable vibration resistance performance detection system according to claim 1, further comprising a support body (3), wherein the support body (3) supports the superconducting cable (5), the support body (3) is provided with a lead groove, the shape of the lead groove is adapted to the shape of the superconducting cable (5), and the superconducting cable (5) is placed in the lead groove.
3. A superconducting cable vibration resistance test system according to claim 2, characterized in that the support body (3) is a cement column.
4. A superconducting cable vibration resistance test system as claimed in claim 1, wherein the acceleration sensor (1) and the displacement sensor (2) are arranged at intervals.
5. A superconducting cable vibration resistance detection system according to claim 4, wherein the acceleration sensor (1) and the displacement sensor (2) are arranged at equal intervals.
6. A superconducting cable vibration resistance detection system according to claim 5, wherein the distance between the adjacent acceleration sensor (1) and the displacement sensor (2) is 175 cm.
7. A superconducting cable vibration resistance performance detection system as claimed in claim 1, characterized in that the system further comprises a vacuum gauge, a helium mass spectrometer leak detector and a controllable voltage source, the superconducting cable insulation sleeve is respectively connected with the vacuum gauge and the vacuum unit, the helium mass spectrometer leak detector is connected with the evacuation chamber of the vacuum unit, the controllable voltage source and the vacuum gauge are connected with the controller, and the controllable voltage source is connected with the core wire of the superconducting cable (5).
8. A superconducting cable vibration resistance test system according to claim 7, wherein the superconducting cable heat insulating sheath is connected to the vacuum gauge and the vacuum unit through a three-way valve, respectively.
9. A method of testing using the superconducting cable vibration resistance test system of claim 7, the method comprising:
the superconducting cable (5) is driven by the vibrating table (4) to vibrate;
the controller analyzes the dynamic performance of the superconducting cable (5) according to signals of the acceleration sensor (1), the displacement sensor (2) and the strain gauge;
recording the vacuum degrees of the superconducting cable (5) before and after vibration by using a vacuum gauge, and analyzing the leakage and deflation performance of the superconducting cable (5);
and applying variable-frequency excitation voltage to the superconducting cable (5), measuring the voltage and current of the superconducting cable (5) under the excitation voltage with different frequencies, and analyzing the insulation performance of the superconducting cable (5) before and after vibration.
10. A superconducting cable vibration resistance performance detection method according to claim 9, wherein the process of analyzing the leakage and discharge performance of the superconducting cable (5) comprises:
before vibration, the vacuum unit evacuates the superconducting cable insulation sleeve to below 0.01pa, and a helium mass spectrometer leak detector is used for detecting the leakage condition; disconnecting the helium mass spectrometer leak detector, stopping vacuumizing the vacuum unit, and recording the rising data of the vacuum degree before vibration by the vacuum gauge;
after vibration, the vacuum unit evacuates the superconducting cable insulation sleeve to below 0.01pa, the vacuum unit stops evacuating, and the vacuum gauge records the data of vacuum degree increase after vibration; and analyzing the leakage and deflation performance of the superconducting cable (5) according to the data of the vacuum degree increase before vibration and the data of the vacuum degree increase after vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011523827.2A CN112763170A (en) | 2020-12-22 | 2020-12-22 | System and method for detecting vibration resistance of superconducting cable |
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| CN202011523827.2A CN112763170A (en) | 2020-12-22 | 2020-12-22 | System and method for detecting vibration resistance of superconducting cable |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113670547A (en) * | 2021-08-17 | 2021-11-19 | 国网上海市电力公司 | Vibration test and vibration resistance performance test method for superconducting cable |
| CN114114104A (en) * | 2021-11-19 | 2022-03-01 | 中车长春轨道客车股份有限公司 | Method and device for determining functional integrity of superconducting magnet |
| WO2024092915A1 (en) * | 2022-11-04 | 2024-05-10 | 中车长春轨道客车股份有限公司 | Shock-resistance design method and apparatus for high-temperature superconducting magnet of electrodynamic suspension train |
-
2020
- 2020-12-22 CN CN202011523827.2A patent/CN112763170A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113670547A (en) * | 2021-08-17 | 2021-11-19 | 国网上海市电力公司 | Vibration test and vibration resistance performance test method for superconducting cable |
| CN114114104A (en) * | 2021-11-19 | 2022-03-01 | 中车长春轨道客车股份有限公司 | Method and device for determining functional integrity of superconducting magnet |
| WO2023087407A1 (en) * | 2021-11-19 | 2023-05-25 | 中车长春轨道客车股份有限公司 | Method and apparatus for determining function integrity degree of superconducting magnet |
| WO2024092915A1 (en) * | 2022-11-04 | 2024-05-10 | 中车长春轨道客车股份有限公司 | Shock-resistance design method and apparatus for high-temperature superconducting magnet of electrodynamic suspension train |
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