CN113551859A - GIS earthquake simulation shaking table test method - Google Patents
GIS earthquake simulation shaking table test method Download PDFInfo
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- CN113551859A CN113551859A CN202110644213.8A CN202110644213A CN113551859A CN 113551859 A CN113551859 A CN 113551859A CN 202110644213 A CN202110644213 A CN 202110644213A CN 113551859 A CN113551859 A CN 113551859A
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- G—PHYSICS
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- 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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Abstract
The invention relates to the technical field of power grid disaster prevention and reduction, in particular to a GIS earthquake simulation shaking table test method, which comprises the following steps: step one, fixing the GIS equipment on an earthquake simulation shaking table, wherein the earthquake simulation shaking table test refers to GB 50260 plus 2013 'earthquake resistance design specification of electric power facilities'; and secondly, acquiring the natural vibration frequency of the GIS equipment by three-way excitation of white noise waves and processing the acceleration response of key parts, respectively inserting a white noise wave unidirectional input before and after each anti-vibration test, and comparing the change of the natural vibration frequency of the GIS equipment after each test to know whether the equipment has structural damage invisible to naked eyes. By the aid of the test method, the dynamic characteristics and the seismic response of the GIS equipment casing can be measured through the earthquake dynamic simulation shaking table test according to given test requirements, and the seismic capacity of the GIS equipment is judged.
Description
Technical Field
The invention relates to the technical field of disaster prevention and reduction of a power grid, in particular to a GIS earthquake simulation shaking table test method.
Background
The electric power system, as an important component of the lifeline project, goes deep into various aspects of social production and life, and plays a significant role in national economy. Once the power system is damaged, normal production and life of the society are seriously influenced, and unexpected consequences such as water shortage, fire and the like can be caused, so that huge loss is brought. In recent years, the Wenchuan earthquake in 2008, the Yushu earthquake in 2010 and the Yaan earthquake in 2013 all cause serious damage to related electric power facilities, so that the direct or indirect economic loss is huge, and the fact that the destructive sudden disaster of the earthquake can cause very serious damage to an electric power system is fully explained.
GIS (gas insulated switchgear) is short for gas insulated fully-enclosed combined electrical. The device consists of a circuit breaker, a disconnecting switch, a mutual inductor, a lightning arrester, a bus, a connecting piece, an outlet terminal and the like, all of which are enclosed in a metal grounded shell, and SF6 insulating gas with certain pressure is filled in the metal grounded shell. Has been widely operated and around the world since the practical use in the sixties of the last century. The high-voltage and ultrahigh-voltage power supply is not only widely applied in the high-voltage and ultrahigh-voltage fields, but also used in the ultrahigh-voltage field.
GIS equipment structure is complicated, relates to and has pipeline, pillar class equipment, generating line etc. will bear great earthquake effect when earthquake acts on. The GIS equipment casing is mostly made of ceramic or composite materials, the natural frequency range of the GIS equipment casing is more than 1-10 Hz, the GIS equipment casing is close to the excellent frequency range of seismic waves, resonance is very easy to generate under the action of an earthquake, and as the damping of the equipment is small, once the equipment is close to the resonance frequency, the power amplification coefficient is very large, and the equipment is easy to break and fail under the action of the earthquake, so that the whole GIS equipment is damaged. In addition, GIS equipment sleeves are often mounted on metal pipeline structures with high rigidity, and seismic action response of the strut equipment is further increased due to the power amplification effect of the pipeline structures. Therefore, the earthquake-resistant performance of the GIS equipment sleeve is a key link of the earthquake safety of the whole GIS equipment.
Disclosure of Invention
In order to effectively solve the problems in the background technology, the invention provides a GIS earthquake simulation shaking table test method, which has the following specific technical scheme;
a GIS earthquake simulation shaking table test method is characterized in that: the method comprises the following steps: step one, fixing the GIS equipment on an earthquake simulation shaking table, wherein the earthquake simulation shaking table test refers to GB 50260 plus 2013 'earthquake resistance design specification of electric power facilities'; and secondly, acquiring the natural vibration frequency of the GIS equipment by three-way excitation of white noise waves and processing the acceleration response of key parts, respectively inserting a white noise wave unidirectional input before and after each anti-vibration test, and comparing the change of the natural vibration frequency of the GIS equipment after each test to know whether the equipment has structural damage invisible to naked eyes.
Preferably, in the second step, the frequency range of the white noise random wave is 0.1 Hz-50 Hz, the acceleration peak value is 0.05g, and the duration is not less than 60 s.
Preferably, the test piece of the test is of a non-axisymmetric structure, and at least two horizontal seismic tests are simultaneously carried out.
Preferably, the Test Response Spectrum (TRS) generated by the vibration table should envelop the required input standard response spectrum (RRS), and the difference between the two spectrum values should be between 0 and 50 percent, and if a small part of single points of the TRS are outside the tolerance band and are staggered with the resonance frequency of the test equipment, the TRS can be used.
Compared with the prior art, the invention has the beneficial effects that: by the aid of the test method, dynamic characteristics (natural vibration frequency and damping ratio) and seismic response of the GIS equipment casing can be measured through a seismic motion simulation vibration table test according to given test requirements (including input of excitation waves, tolerance control between a table top output spectrum and an expected spectrum, performance evaluation standards and the like), and the seismic capacity of the GIS equipment is judged.
Drawings
FIG. 1 is a standard time-course waveform;
FIG. 2 is a graph of the spectrum of a standard time-course wave;
FIG. 3 is a white noise random wave plot;
FIG. 4 is a schematic diagram of typical GIS casing test point arrangement.
Detailed Description
The following detailed description of the preferred embodiments will be made with reference to the accompanying drawings. A GIS earthquake simulation shaking table test method,
1. and (4) inputting the test.
(1) As the GIS is an equipment structure system with a support, the GIS carries out earthquake simulation shaking table test with reference to GB 50260 plus 2013 electric power facility earthquake-proof design specification, and considering the universality of an equipment application field and the possibility of damage accumulation on equipment caused by various earthquake wave excitation inputs and comprehensively considering the test cost, the method only recommends to adopt an artificially synthesized earthquake excitation wave as the earthquake input. The standard time-course wave selected in the test is shown in the attached drawing 1, the wave accords with the principle of seismic design standard reaction spectrum, the characteristic period is 0.9s, all field types are basically enveloped, and the corresponding frequency spectrum curve is shown in the attached drawing 2.
(2) The self-vibration frequency of the GIS equipment can be obtained by three-way excitation of white noise waves and processing the acceleration response of key parts. According to the test method, a white noise wave unidirectional input is respectively inserted before and after each anti-seismic test, and whether the equipment is subjected to structural damage (such as cracks) invisible to naked eyes or not is known by comparing the change of the self-vibration frequency of the GIS equipment after each test. The frequency range of the white noise random wave adopted by the test method is 0.1 Hz-50 Hz, the acceleration peak value is 0.05g, and the duration is not less than 60 s. The waveform of the white noise random wave is shown in fig. 3.
2. Test requirements
(1) The test piece is of a non-axisymmetric structure, and at least two horizontal seismic tests are required to be simultaneously carried out;
(2) the Test Response Spectrum (TRS) generated by the vibration table is required to envelop an input standard response spectrum (RRS), the difference between the two spectrum values is 0-50%, and if a small part of single points of the TRS are outside a tolerance band and are staggered with the resonance frequency of the test equipment, the TRS can also be accepted;
(3) considering the test capability condition of the seismic table, the actual output acceleration value of the table surface is often lower than the target acceleration value, so the test acceleration of the table surface is considered to be 1.05 times of the envelope amplification factor. The actual acceleration peak input is determined according to the following formula:
apractice of＝1.05aDesign of
3. Test conditions
GIS equipment antidetonation test process: (I) firstly, carrying out white noise input with the acceleration peak value of 0.05 g-0.08 g and the duration time of not less than 60 s; (II) the second step iterates multiple times with acceleration peaks to meet tolerance requirements according to a given seismic excitation standard time-course wave. And after the test piece is tested, a white noise test is carried out to ensure that the fundamental frequency change of the equipment is within an allowable range, so that the equipment is not damaged. The test working conditions of the typical GIS equipment earthquake simulation shaking table are shown in table 1, and the GIS equipment earthquake simulation shaking table can be adjusted according to the weight size of the GIS equipment, the test capability of the earthquake simulation shaking table, the equipment earthquake resistance target and other factors during actual operation.
TABLE 1 GIS equipment earthquake simulation shaking table test condition and purpose
4. Sensor arrangement
The test method mainly examines the shock resistance of the GIS equipment according to the maximum stress of the sleeve of the GIS equipment, in addition, a plurality of accelerometers are arranged at key positions (such as a table top, the top end of a support and the top of the sleeve) of the equipment, so that parameters such as the power amplification coefficient of the support can be obtained, and a displacement time-course curve of the key positions can be obtained through further data processing. Therefore, the test method provides that strain gauges are adhered to corresponding positions of the root of the sleeve in the horizontal X direction and the horizontal Y direction (an X, Y axis can be selected according to factors such as equipment appearance and arrangement), accelerometers are placed at the top and the end of the vibration table, the support and the sleeve, the test point position schematic diagram of the typical GIS equipment earthquake simulation vibration table is shown in the attached figure 4, and the sensor arrangement scheme is shown in the table 2.
TABLE 2 typical GIS device sleeve sensor arrangement scheme
5. Evaluation of test results
(1) The maximum stress of the casing in the test was obtained according to the following formula. According to the result, corresponding earthquake-resistant evaluation conclusion is made by referring to 'earthquake-resistant design code of electric power facilities' (GB500260-2013)
σMeasured in fact＝Eε
In the formula:
σmeasured in fact-experimentally measured stress, MPa;
e-modulus of elasticity, MPa, of the material;
ε -measured strain.
(2) Critical site acceleration data processing
The displacement time-course curve of the key part can be obtained by integrating the acceleration data of the key part, and in addition, the values of the acceleration dynamic amplification coefficient and the like of the GIS support can also be obtained through the related acceleration data (such as a table top, the top of the support and the like) so as to be used as the design and improvement reference of related equipment. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A GIS earthquake simulation shaking table test method is characterized in that: the method comprises the following steps: step one, fixing the GIS equipment on an earthquake simulation shaking table, wherein the earthquake simulation shaking table test refers to GB 50260 plus 2013 'earthquake resistance design specification of electric power facilities'; and secondly, acquiring the natural vibration frequency of the GIS equipment by three-way excitation of white noise waves and processing the acceleration response of key parts, respectively inserting a white noise wave unidirectional input before and after each anti-vibration test, and comparing the change of the natural vibration frequency of the GIS equipment after each test to know whether the equipment has structural damage invisible to naked eyes.
2. The GIS seismic modeling shaking table test method of claim 1, characterized in that in step two, the frequency range of the white noise random wave is 0.1 Hz-50 Hz, the acceleration peak is 0.05g, and the duration is not less than 60 s. .
3. The GIS seismic simulation shaking table test method of claim 1, wherein the test piece is of a non-axisymmetric structure, and at least two horizontal seismic tests should be performed simultaneously.
4. The GIS seismic modeling shaking table test method of claim 1, characterized in that the envelope of the Test Response Spectrum (TRS) generated by the shaking table requires an input standard response spectrum (RRS), the difference between the two spectrum values should be between 0-50%, if the TRS has a small part of single points outside the tolerance band and offset from the resonance frequency of the test equipment.
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| CN114114384A (en) * | 2021-12-24 | 2022-03-01 | 南京苏试广博环境可靠性实验室有限公司 | Earthquake simulation test method |
| CN114419848A (en) * | 2021-12-31 | 2022-04-29 | 河北省地矿局第一地质大队 | Debris flow early warning system based on distributed Internet of things |
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Application publication date: 20211026 |