CN111505466A - Partial discharge vibration detection method for combined electrical appliance - Google Patents
Partial discharge vibration detection method for combined electrical appliance Download PDFInfo
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- CN111505466A CN111505466A CN202010517355.3A CN202010517355A CN111505466A CN 111505466 A CN111505466 A CN 111505466A CN 202010517355 A CN202010517355 A CN 202010517355A CN 111505466 A CN111505466 A CN 111505466A
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000001228 spectrum Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000001133 acceleration Effects 0.000 claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims description 15
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000003745 diagnosis Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 208000028659 discharge Diseases 0.000 description 23
- 230000007547 defect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- G01R31/1209—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 using acoustic measurements
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1254—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 of components, parts or materials of gas-insulated power appliances or vacuum gaps
Abstract
The invention relates to a method for detecting partial discharge vibration of a combined electrical appliance, which is technically characterized by comprising the following steps of: the method comprises the steps of selecting detection positions on a tested pipe section and a reference pipe section, detecting vibration signals by using an acceleration sensor, carrying out fast Fourier transform on the detected vibration signals, calculating the maximum amplitude of a vibration signal frequency spectrum, comparing the maximum amplitude of the vibration signal frequency spectrum of the tested pipe section with the maximum amplitude of the vibration signal frequency spectrum of the reference pipe section, judging whether a partial discharge fault exists in the tested pipe section, and achieving the effect of accurately detecting the partial discharge fault of the gas insulated switchgear. The equipment used by the method is small, convenient to use and move, high in accuracy, free of electrical connection with the tested pipe section and free of any influence on the running state of the equipment, and the vibration testing technology is added into the electrical equipment fault diagnosis method, so that the fault hidden danger can be found earlier than that of the electrical equipment fault diagnosis method.
Description
Technical Field
The invention belongs to the technical field of power transmission and transformation equipment fault diagnosis, and particularly relates to a partial discharge vibration detection method for a combined electrical appliance.
Background
The gas insulated combined electrical apparatus is a complete set of electrical apparatus formed by combining various high-voltage electrical apparatus installation main wiring and system functions. The cylinder filled with high-voltage SF6 insulating gas encapsulates common equipment of a transformer substation, such as a bus, a voltage transformer, a current transformer, a lightning arrester, a disconnecting switch, a circuit breaker and the like, so that the transformer substation has the characteristics of strong systematicness, high integration level, small occupied area, good reliability and the like, is one of the most important electrical equipment in high-voltage direct-current engineering, and is widely applied to power systems with 66-1000 kV voltage levels.
Although the reliability of the combined electrical apparatus is strong, various faults are developed along with the increasing of the using amount, and insulation defects such as high-voltage conductor protrusions, grounding shell protrusions, metal particles on the surface of an insulator, air bubbles in the insulator, insulator cracks, free metal particles, a suspended electrode and the like are generated in the production, transportation, installation and operation processes of the gas insulated combined electrical apparatus; when the gas insulated switchgear operates at rated voltage, partial discharge can be generated at an insulation defect position, and further continuous degradation of an insulation system is caused, and finally equipment failure is caused. The gas insulated switchgear has high voltage level and large installation capacity, and once an accident occurs, the stable operation of the whole power system can be influenced, so that huge economic loss is caused, and the safety of operators is threatened.
Since the prior art uses large proprietary detection equipment for detection and since such partial discharge faults are very hidden from easy detection when they are first to occur, they cannot be detected by electrical measurement until significant discharge occurs. In fact, at the earliest stage of discharge, the fault can be expressed in a vibration mode, if the gas insulated switchgear can be monitored in an early stage by a vibration test method to detect whether a partial discharge fault exists, the hidden fault danger can be eliminated as soon as possible, and the safety of operators can be guaranteed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for detecting partial discharge vibration of a combined electrical apparatus, which can accurately detect whether a partial discharge fault exists in a gas insulated combined electrical apparatus.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a partial discharge vibration detection method for a combined electrical appliance comprises the following steps:
step 5, recording and storing the calculation result;
step 6, selecting a reference pipe section;
step 7, selecting the same detection position as the tested pipe section in the step 1 on the reference pipe section, and respectively installing a vibration acceleration sensor at the axial position and the radial position of the reference pipe section;
step 8, measuring vibration signals of two vibration acceleration sensors of the reference pipe section;
step 9, performing fast Fourier transform on the measured vibration signal to obtain a vibration signal frequency spectrum;
step 10, calculating the maximum amplitude of the vibration signal frequency spectrum, and measuring five times to obtain an average value;
and 11, calculating an absolute value of a difference value between the calculation result in the step 4 and the calculation result in the step 10, and judging whether the tested pipe section has a fault or not according to the calculated absolute value.
And the detection position selected in the step 1 is the middle of a section of air chamber of the tested pipe section.
And the sensitivity of the vibration acceleration sensor used in the step 1 is less than or equal to 250mV/g, and the sampling frequency is more than or equal to 20 kHz.
In addition, the vibration signal frequency spectrum used for calculating the maximum amplitude in the step 4 and the step 10 is between 1200Hz and 4500Hz, and the calculated maximum amplitude does not include a 50Hz frequency multiplication component in the frequency spectrum interval between 1200Hz and 4500Hz and the maximum amplitude within plus or minus 2 Hz.
In step 6, the reference pipe section is the pipe section which is consistent with the pipe section to be tested in the same equipment in specification and model, has good working state, has no abnormal vibration and noise and has the same function.
Moreover, the method for judging whether the tested pipe section has the fault in the step 11 comprises the following steps: and if the absolute value of the difference is larger than 10% of the calculation result in the step 10, judging that the tested pipe section has a partial discharge fault, and if the absolute value of the difference is smaller than or equal to 10% of the calculation result in the step 10, judging that the tested pipe section is normal.
The invention has the advantages and positive effects that:
1. the invention selects the detection positions on the tested pipe section and the reference pipe section, uses the detection vibration signal of the acceleration sensor to carry out fast Fourier transform on the detection vibration signal and calculate the maximum amplitude of the vibration signal frequency spectrum, compares the maximum amplitude of the vibration signal frequency spectrum of the tested pipe section with the maximum amplitude of the vibration signal frequency spectrum of the reference pipe section and judges whether the tested pipe section has partial discharge fault. The function of accurately detecting the partial discharge fault of the gas insulated switchgear is realized.
2. The device used by the invention is small, convenient to use and move, high in accuracy, and has no electric connection with the tested pipe section, and has no influence on the running state of the device.
3. The invention adds the vibration testing technology to the electrical equipment fault diagnosis method, and compared with the electrical equipment fault diagnosis method, the method can discover the hidden fault danger earlier.
Drawings
FIG. 1 is a flow chart of a method for detecting partial discharge vibration of a combined electrical appliance according to the present invention;
FIG. 2 is a schematic diagram of the location of two acceleration vibration sensors mounted in a pipe section under test according to the present invention;
FIG. 3 is a graph of the frequency spectrum of the vibration signal obtained by testing 4 casing pipe sections under test according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A partial discharge vibration detection method for a combined electrical apparatus, as shown in FIG. 1, includes the following steps:
In this step, the acceleration vibration sensor is placed on the principle that the detected vibration signal is strongest. Through testing, the vibration signal that air chamber both ends flange department detected is weaker, and the vibration signal that air chamber intermediate position detected is stronger. Therefore, the vibration sensor is placed in the middle of a segment of the air chamber for detection. And because the difference between the vibration propagation direction and the vibration characteristics of each point is considered, a vibration sensor is respectively arranged at the axial position and the radial position, and the specifications of the 2 acceleration vibration sensors are that the sensitivity is less than or equal to 250mV/g and the sampling frequency is more than or equal to 20 kHz.
step 5, recording and storing the calculation result;
step 6, selecting a reference pipe section;
in this step, the reference pipe section is a pipe section which is consistent with the pipe section to be tested in the same equipment in specification and model, has good working state and no abnormal vibration and noise and has the same function.
Step 7, selecting the same detection position as the tested pipe section in the step 1 on the reference pipe section, and respectively installing a vibration acceleration sensor at the axial position and the radial position of the reference pipe section;
step 8, measuring vibration signals of two vibration acceleration sensors of the reference pipe section;
step 9, performing fast Fourier transform on the measured vibration signal to obtain a vibration signal frequency spectrum;
step 10, calculating the maximum amplitude of the vibration signal frequency spectrum between 1200Hz and 4500Hz, wherein the maximum amplitude does not contain 50Hz frequency multiplication components in the frequency spectrum interval between 1200Hz and 4500Hz and the maximum amplitude within plus or minus 2Hz, and measuring five times to obtain an average value;
and 11, calculating the absolute value of the difference between the calculation result in the step 4 and the calculation result in the step 10, if the absolute value of the difference is greater than 10% of the calculation result in the step 10, judging that the tested pipe section has a partial discharge fault, and if the absolute value of the difference is less than or equal to 10% of the calculation result in the step 10, judging that the tested pipe section is normal.
According to the method for detecting the partial discharge vibration of the combined electrical apparatus, for example, a certain substation combined electrical apparatus 116 is taken as an incoming line interval bus sleeve pipe section, the sleeve is suspected to have the problem of excessive vibration and noise in the inspection process, and then the method is used for detecting the partial discharge vibration.
And selecting 3 sections of sleeve pipe sections suspected to have the partial discharge fault problem from the bus sleeve pipe sections at the incoming line interval of a certain substation combined electrical appliance 116. Meanwhile, according to the method, the sleeve pipe section which has the same specification and model as those of the sleeve pipe section of the incoming line spacing bus of the certain substation combined electrical apparatus 116, has good working state, no abnormal vibration and noise and has the same function is selected from the standby devices to be used as a reference sleeve pipe section.
The middle of a section of air chamber of a tested reference sleeve pipe section is set as a detection position, the detection positions of other 3 sleeve pipe sections are kept consistent with the position of the reference sleeve pipe section, meanwhile, a vibration acceleration sensor with the sensitivity less than or equal to 250mV/g and the sampling frequency more than or equal to 20kHz is respectively installed at the axial position and the radial position of the detection position, as shown in figure 2, and a DH5992D dynamic signal tester is connected with the vibration acceleration sensor to detect vibration signals.
The spectrogram of 4 examined casing pipe sections is shown in fig. 3, wherein 1 is the reference casing pipe section, and 2, 3 and 4 are the casing pipe sections suspected of having partial discharge failure.
Through the frequency spectrum diagrams of 4 sleeve pipe sections, the phenomenon that the frequency of a No. 1 reference sleeve pipe section is not obviously increased between 1200Hz and 4500Hz can be seen, so that the problem of partial discharge fault does not exist, the amplitude of a No. 2 sleeve pipe between 1200Hz and 4500Hz is increased by 100 percent compared with that of the No. 1 sleeve pipe section, so that the problem of partial discharge fault exists in the No. 2 sleeve pipe section, and the amplitude of No. 3 and No. 4 sleeve pipes between 1200Hz and 4500Hz is increased by more than 200 percent compared with that of the No. 1 sleeve pipe section, so that the problem of partial discharge fault exists in the No. 3 and No.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (6)
1. A partial discharge vibration detection method for a combined electrical apparatus is characterized by comprising the following steps:
step 1, selecting a detection position on a tested pipe section, and respectively installing a vibration acceleration sensor at the axial position and the radial position of the detection position;
step 2, measuring vibration signals of two vibration acceleration sensors of the tested pipe section;
step 3, performing fast Fourier transform on the measured vibration signal to obtain a vibration signal frequency spectrum;
step 4, calculating the maximum amplitude of the vibration signal frequency spectrum, and measuring five times to obtain an average value;
step 5, recording and storing the calculation result;
step 6, selecting a reference pipe section;
step 7, selecting the same detection position as the tested pipe section in the step 1 on the reference pipe section, and respectively installing a vibration acceleration sensor at the axial position and the radial position of the reference pipe section;
step 8, measuring vibration signals of two vibration acceleration sensors of the reference pipe section;
step 9, performing fast Fourier transform on the measured vibration signal to obtain a vibration signal frequency spectrum;
step 10, calculating the maximum amplitude of the vibration signal frequency spectrum, and measuring five times to obtain an average value;
and 11, calculating an absolute value of a difference value between the calculation result in the step 4 and the calculation result in the step 10, and judging whether the tested pipe section has a fault or not according to the calculated absolute value.
2. The method for detecting partial discharge vibration of a combined electrical appliance according to claim 1, wherein: the detection position selected in the step 1 is the middle of a section of air chamber of the tested pipe section.
3. The method for detecting partial discharge vibration of a combined electrical appliance according to claim 1, wherein: the sensitivity of the vibration acceleration sensor used in the step 1 is less than or equal to 250mV/g, and the sampling frequency is more than or equal to 20 kHz.
4. The method for detecting partial discharge vibration of a combined electrical appliance according to claim 1, wherein: the vibration signal frequency spectrum used for calculating the maximum amplitude in the step 4 and the step 10 is between 1200Hz and 4500Hz, and the calculated maximum amplitude does not contain 50Hz frequency multiplication components in the frequency spectrum interval between 1200Hz and 4500Hz and the maximum amplitude within plus or minus 2 Hz.
5. The method for detecting partial discharge vibration of a combined electrical appliance according to claim 1, wherein: in the step 6, the reference pipe section is the pipe section which is consistent with the pipe section to be tested in the same equipment in specification and model, has good working state and no abnormal vibration and noise and has the same function.
6. The method for detecting partial discharge vibration of a combined electrical appliance according to claim 1, wherein: the method for judging whether the tested pipe section has the fault in the step 11 comprises the following steps: and if the absolute value of the difference is larger than 10% of the calculation result in the step 10, judging that the tested pipe section has a partial discharge fault, and if the absolute value of the difference is smaller than or equal to 10% of the calculation result in the step 10, judging that the tested pipe section is normal.
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| CN202010517355.3A CN111505466A (en) | 2020-06-09 | 2020-06-09 | Partial discharge vibration detection method for combined electrical appliance |
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| CN202010517355.3A CN111505466A (en) | 2020-06-09 | 2020-06-09 | Partial discharge vibration detection method for combined electrical appliance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113466606A (en) * | 2021-05-12 | 2021-10-01 | 国网浙江省电力有限公司绍兴供电公司 | Cable fault positioning system and method based on voiceprint recognition |
| CN113720545A (en) * | 2021-08-23 | 2021-11-30 | 国网天津市电力公司电力科学研究院 | Vibration detection method for combined electrical appliance flange gas leakage fault |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113466606A (en) * | 2021-05-12 | 2021-10-01 | 国网浙江省电力有限公司绍兴供电公司 | Cable fault positioning system and method based on voiceprint recognition |
| CN113720545A (en) * | 2021-08-23 | 2021-11-30 | 国网天津市电力公司电力科学研究院 | Vibration detection method for combined electrical appliance flange gas leakage fault |
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