CN102650667B - Method for detecting metal particles in GIS (Gas Insulated Switchgear) based on triangular wave high voltage - Google Patents
Method for detecting metal particles in GIS (Gas Insulated Switchgear) based on triangular wave high voltage Download PDFInfo
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Abstract
A method for detecting metal particles in a GIS (Gas Insulated Switchgear) based on triangular wave high voltage is characterized by comprising the steps as follows: artificial metal defects are arranged in the GIS; the triangular wave peak voltage is preset, and the vibration signal level is measured when the particles are static; the input time of the low voltage terminal of a voltage regulator is controlled through a voltage regulating timing control device; and before a test is finished, the positive and the negative polarities of triangular wave high voltage are required to be applied to a GIS high-voltage conductor alternately to eliminate the influence of residual electricity of DC voltage. The method has the remarkable advantages that the structure is compact and small, the transportation and the debugging are easy, the output voltage is uniform, the sensitivity is high, and the like.
Description
Technical field
The invention belongs to GIS class insulation of electrical installation detection technique field, be particularly useful for GIS kind equipment interior metal particle defects and detect.
Background technology
SF in GIS
6gas is strong electronegativity gas, has excellent arc extinguishing ability, and its compact conformation, is widely used in electric system.The manufacturing firm of GIS usually thinks, GIS is non-maintaining product, can move 10 years, and even 30 years.But in electric system actual moving process, find that GIS does not have the insulating property with very good performance, especially GIS that manufacturer declares doubtful.Thereby vast electric system researcher is devoted for years in the research of GIS D.C. isolation detection technique, studied the partial discharge phenomenon that industrial-frequency alternating current is depressed GIS insulation defect, conventional method is mainly pulse current method, ultrasonic method and ultrahigh frequency method.These methods have higher sensitivity for the detection of some specific defects.And conventional shelf depreciation collection of illustrative plates (PRPD, Phase Resolved Partial Discharge) has also obtained a lot of useful effects.
Yet the detection for metal particle of these methods is for a long time under alternating voltage, its alternating voltage makes metal particle cannot obtain peak acceleration, thereby its motion oscillations amplitude is lower, is unfavorable for detecting metal particle.Under alternating voltage, the larger motion height that particulate will obtain, must apply relatively high voltage at GIS high-pressure conductor, but particulate take-off probably causes GIS flashover, thereby adopt rising alternating voltage to reach to obtain the method for the higher vibration height of particulate, be easy to make GIS that destructive damage occurs.
And metal particle is lower compared with alternating voltage under DC voltage, and AC-testing supply is bulky, be unfavorable for long-distance carrying and high altitude localities test, DC voltage can be so that particulate obtains maximum acceleration and speed, and commencing height is relatively high, thereby the vibration amplitude of particulate under DC voltage is than high under alternating voltage, thereby can obtain the larger vibration amplitude of particulate by lower DC voltage, make detection of particulates technology under DC voltage obtain good sensitivity, be conducive to detection of particulates.
Based on above analysis, the particle detection method under known employing DC voltage has very high sensitivity, and DC voltage generator volume is little, and portable performance is stronger, and the DC voltage of using is relatively low, for GIS test product, there is no destructiveness.Thereby the present invention proposes to adopt GIS to apply the particle defects detection method under DC voltage.
Summary of the invention
The object of the invention is to solve the practical problems of metal particle defects detection dangerous in GIS, batch (-type) vibration level signal under main relatively positive polarity and negative polarity triangular wave DC voltage, and vibration signal collection of illustrative plates track during particle movement, whether there is metal particle in judgement GIS inside.
The present invention realizes by following technical proposal.
Metal particle detection method in GIS based on triangular wave high pressure, the present invention is at GIS(Gas Insulated Switchgear), gas insulated combined electrical equipment) in GIS, arrange artificial metal defect, first apply preset triangular wave crest voltage, by vibration transducer, obtain the vibration level signal of defect when static, then at pressure regulation time-controlling arrangement, arrange and add in advance triangular wave peak value, then by pressure regulation time-controlling arrangement, control pressure regulator low pressure end pressure rising time (for example 10s～40s), and then control pressure regulator high-pressure side and export, while arriving triangular wave peak value, at once adjust back Voltage-output and be down to no-voltage, at GIS high-pressure side, apply triangular wave and so forth, now along with triangle wave voltage back and forth fluctuates, the charged take-off of GIS interior metal particulate, and be presented in the batch (-type) ultrasonic signal group that stationary state is different, the particle movement vibration level signal of comprehensive relatively stationary state and triangle wave voltage state, there is situation in judgement particulate.Preset triangular wave crest voltage, vibration level signal when measurement particulate is static, then rubber hammer hammering GIS shell, make the inner particulate of GIS obtain initial velocity, now positive polarity voltage makes particulate move in GIS inside cavity, the positive polarity voltage duration can determine along with particle size, then reversed polarity, make high voltage direct current generator produce negative polarity DC voltage, now particulate is under positive polarity voltage effect in early stage, particulate institute is positively charged along with reverse voltage effect, and make particle movement track present retarded motion, but along with particle collision high-pressure conductor, positively charged with particulate institute constantly, and then the vibration signal that produces of particulate presents and starts the high track state of low rear portion batch (-type), the signal level of comprehensive utilization vibration signal size and Stillness and motion state, whether assessment particulate exists and particle size.By pressure regulation time-controlling arrangement, control pressure regulator low pressure end input time, setting voltage peak value not, stationary state vibration signal is noise substantially, and voltage raises, metal particle is now beated at once, monitoring vibration sensor obtains simultaneously vibration level signal and now particulate take-off voltage, comprehensive assessment test of many times vibration level signal and particulate take-off voltage levvl, whether judgement particulate exists and quantity.Before test is complete, need to adopt triangular wave high pressure positive-negative polarity to be alternately applied to GIS high-pressure conductor, eliminate the impact of DC voltage residual charge.
The invention has the beneficial effects as follows:
A. compact conformation, be convenient to transportation, be easy to control and operation.
B. determination methods is simple;
Below in conjunction with accompanying drawing and example, further set forth content of the present invention.
Accompanying drawing explanation
Metal particle detection method schematic diagram in the GIS of Fig. 1 based on triangular wave high pressure;
In the GIS of Fig. 2 based on triangular wave high pressure, metal particle detection method voltage applies schematic diagram (for 220kVGIS).
In figure: 1, pressure regulation time-controlling arrangement; 2, pressure regulator low pressure end; 3, pressure regulator high-pressure side; 4, pole changer; 5, wire; 6, DC generator low pressure end; 7, ground connection; 8, DC generator; 9, DC generator high-pressure side; 10, high-voltage connection; 11, bushing; 12, GIS; 13, high-pressure conductor, 14, ball particulate; 15, vibration transducer; 16, prime amplifier; 17, vibration signal processing terminal; 18, rubber hammer; 19, GIS shell; 20, triangular wave rising edge angle; 21, the positive polarity triangular wave duration; 22, the negative polarity triangular wave duration.
Embodiment
Metal particle detection method in GIS based on triangular wave high pressure, method of the present invention is:
(1) arrange artificial metal defect in GIS, first apply preset triangular wave crest voltage, by vibration transducer, obtain the vibration level signal of defect when static, then at pressure regulation time-controlling arrangement, arrange and add in advance triangular wave peak value, then by pressure regulation time-controlling arrangement, control pressure regulator low pressure end pressure rising time (for example 10-40s), and then control pressure regulator high-pressure side and export, while arriving triangular wave peak value, at once adjust back Voltage-output and be down to no-voltage, at GIS high-pressure side, apply triangular wave and so forth, now along with triangle wave voltage back and forth fluctuates, the charged take-off of GIS interior metal particulate, and be presented in the batch (-type) ultrasonic signal group that stationary state is different, the particle movement vibration level signal of comprehensive relatively stationary state and triangle wave voltage state, there is situation in judgement particulate.
(2) preset triangular wave crest voltage, vibration level signal when measurement particulate is static, then rubber hammer hammering GIS shell, make the inner particulate of GIS obtain initial velocity, now positive polarity voltage makes particulate move in GIS inside cavity, the positive polarity voltage duration can determine along with particle size, then reversed polarity, make high voltage direct current generator produce negative polarity DC voltage, now particulate is under positive polarity voltage effect in early stage, particulate institute is positively charged along with reverse voltage effect, and make particle movement track present retarded motion, but along with particle collision high-pressure conductor, positively charged with particulate institute constantly, and then the vibration signal that produces of particulate presents and starts the high track state of low rear portion batch (-type), the signal level of comprehensive utilization vibration signal size and Stillness and motion state, whether assessment particulate exists and particle size, be that vibration signal is larger or little, particle size is larger or little, it is higher that vibration signal repeats frequency spectrum, and particle size is less.
(3) by pressure regulation time-controlling arrangement, control pressure regulator low pressure end input time, setting voltage peak value not, stationary state vibration signal is noise substantially, and voltage raises, metal particle is now beated at once, monitoring vibration sensor obtains simultaneously vibration level signal and now particulate take-off voltage, comprehensive assessment test of many times vibration level signal and particulate take-off voltage levvl, whether judgement particulate exists and quantity.
(4) before test is complete, need to adopt triangular wave high pressure positive-negative polarity to be alternately applied to GIS high-pressure conductor, eliminate the impact of DC voltage residual charge.
See Fig. 1, the figure shows metal particle detection method schematic diagram in the GIS based on triangular wave high pressure.In figure, 1 is pressure regulation time-controlling arrangement, and this device is mainly used to control the DC voltage rising time, and then controls pressure regulator voltage peak, and determining of voltage rising time and voltage magnitude, directly determines triangle wave voltage rising edge angle.4 is pole changer, for triangle wave voltage, turns to.First by the 1 levelling triangle wave voltage rise time of pressure regulation time-controlling arrangement, pressure regulator low pressure end 2 input 220V low pressure, by pressure regulator high-pressure side 3 output high pressure, by pole changer 4 control inputs voltage directions, pole changer 4 other ends are connected to DC voltage generator low pressure end 6 by wire 5, at DC voltage generator high-pressure side 9, by high-voltage connection 10, be connected to bushing 11, and then make high pressure understand that body 13 is charged, now ball particulate 14 is in the inner jumping phenomena that occurs of GIS 12, vibration transducer 15 obtains spherical particle 14 vibration signal occurs, vibration signal carries out signal by prime amplifier 16 and amplifies processing, when between detection period, if vibration signal does not obtain spherical particle 14 motion state signal, adopt rubber hammer 18 hammering GIS shells 19, and then obtain particle movement signal, finally by vibration signal processing terminal 17, carry out signal comparative analysis, be that GIS 12 inside are along with the fluctuation of triangle wave voltage, the step vibration signal of particle movement outlet, thereby there is contact relevant to voltage waveform in its motion, by this relation and particle movement vibration signal size, assessment particle number and size.
See Fig. 2, the figure shows metal particle detection method voltage in the GIS based on triangular wave high pressure and apply schematic diagram.In figure, shown the voltage waveform that GIS 12 high-pressure conductors 13 apply.In this waveform, 20 is triangular wave rising edge angle; this angle is steeper; it is relatively large that particulate obtains electric field force; and be easy to overcome the effect of gravity and viscous force; and take-off; and then the vibration signal amplitude while obtaining motion state, be still in motion state vibration signal difference larger, more illustrate that the possibility that particulate exists is larger.And the vibration signal time interval and vibration signal occur constantly just have correlativity with the voltage applying, and more confirm that GIS inside exists metallic conducting particle.When testing experiment finishes, the high pressure of 13 experience positive polarity triangular wave duration 21 of high-pressure conductor and positive polarity triangular wave duration 22, can be so that GIS 12 residual charge impacts weaken or eliminate.
Claims (1)
1. metal particle detection method in the GIS based on triangular wave high pressure, is characterized in that, the method is:
(1) arrange artificial metal defect in GIS, first apply preset triangular wave crest voltage, by vibration transducer, obtain the vibration level signal of defect when static, then at pressure regulation time-controlling arrangement, arrange and add in advance triangular wave peak value, then by pressure regulation time-controlling arrangement, control pressure regulator low pressure end pressure rising time, and then control pressure regulator high-pressure side and export, while arriving triangular wave peak value, at once adjust back Voltage-output and be down to no-voltage, at GIS high-pressure side, apply triangular wave and so forth, now along with triangle wave voltage back and forth fluctuates, the charged take-off of GIS interior metal particulate, and be presented in the batch (-type) ultrasonic signal group that stationary state is different, the particle movement vibration level signal of comprehensive relatively stationary state and triangle wave voltage state, there is situation in judgement particulate,
(2) preset triangular wave crest voltage, vibration level signal when measurement particulate is static, then rubber hammer hammering GIS shell, make the inner particulate of GIS obtain initial velocity, now positive polarity voltage makes particulate move in GIS inside cavity, the positive polarity voltage duration determines along with particle size, then reversed polarity, make high voltage direct current generator produce negative polarity DC voltage, now particulate is under positive polarity voltage effect in early stage, particulate institute is positively charged along with reverse voltage effect, and make particle movement track present retarded motion, but along with particle collision high-pressure conductor, positively charged with particulate institute constantly, and then the vibration signal that produces of particulate presents and starts the high track state of low rear portion batch (-type), the signal level of comprehensive utilization vibration signal size and Stillness and motion state, whether assessment particulate exists and particle size, be that vibration signal is larger or little, particle size is larger or little, it is higher that vibration signal repeats frequency spectrum, and particle size is less,
(3) by pressure regulation time-controlling arrangement, control pressure regulator low pressure end input time, setting voltage peak value not, stationary state vibration signal is noise substantially, and voltage raises, metal particle is now beated at once, monitoring vibration sensor obtains simultaneously vibration level signal and now particulate take-off voltage, comprehensive assessment test of many times vibration level signal and particulate take-off voltage levvl, whether judgement particulate exists and quantity;
(4) before test is complete, need to adopt triangular wave high pressure positive-negative polarity to be alternately applied to GIS high-pressure conductor, eliminate the impact of DC voltage residual charge.
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| CN102680574B (en) * | 2012-05-14 | 2014-11-26 | 云南电力试验研究院（集团）有限公司电力研究院 | GIS (Gas Insulated Switchgear) inner particle detecting method adopting polarity-reversal direct-current voltage |
| CN102928754B (en) * | 2012-11-15 | 2015-06-03 | 云南电力试验研究院（集团）有限公司电力研究院 | Initial movement device for triggering gas insulated switchgear (GIS) equipment defect in local discharge test for electricity |
| CN103605040A (en) * | 2013-11-04 | 2014-02-26 | 国家电网公司 | GIS-equipment built-in lightning-arrester alternating current leakage current test method |
| CN108919071B (en) * | 2018-06-12 | 2023-11-28 | 沈阳工业大学 | Device and method for testing and measuring three-dimensional movement morphology of metal particles under coaxial electrode |
| CN111426473B (en) * | 2020-05-19 | 2022-05-13 | 国网江苏省电力有限公司电力科学研究院 | GIS (gas insulated switchgear) equipment defect detection system and method by utilizing sweep frequency alternating current |
| CN111665421B (en) * | 2020-06-03 | 2022-03-22 | 西安交通大学 | Metal particle detection method for gas insulated substation |
| CN112052618B (en) * | 2020-07-31 | 2024-04-26 | 南方电网科学研究院有限责任公司 | Simulation method and device for free particle running track in GIS |
| CN112881871B (en) * | 2021-01-13 | 2022-08-23 | 国网宁夏电力有限公司电力科学研究院 | Detection method and detection system for metal particles in GIS equipment |
| CN113189452B (en) * | 2021-03-11 | 2022-10-28 | 西安交通大学 | GIS latent metal particle detection device based on external vibration excitation |
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