CN102680574B - GIS (Gas Insulated Switchgear) inner particle detecting method adopting polarity-reversal direct-current voltage - Google Patents
GIS (Gas Insulated Switchgear) inner particle detecting method adopting polarity-reversal direct-current voltage Download PDFInfo
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Abstract
The invention provides a GIS (Gas Insulated Switchgear) inner particle detecting method adopting a polarity-reversal direct-current voltage. According to the invention, the detects of metal particles are arranged in a GIS; and meanwhile, a corresponding device controls a direction selecting switch to be communicated with cathode direct-current voltage; in a GIS testing section, an ultrasonic signal level database is obtained before and after a rubber hammer is hammered when a linear particle, a spherical particle and a plurality of quantities (or lengths) of particles are combined, and a typical ultrasonic signal level difference and a quantitative standard under positive polarity direct-current voltage and negative polarity direct-current voltage are obtained by comparing; the corresponding device controls the direction selecting switch to connect a GIS high-voltage end to the positive polarity direct-current voltage for one minute; and then, the direction selecting switch is connected to the negative polarity direct-current voltage for one minute; and the process is lasted for 10 min back and forth, so as to eliminate influences on a space charge and a residual charge, caused by applying the direct-current voltage; and the metal particles in the GIS are distinguished. The method disclosed by the invention has the obvious advantages of simplicity, small power, easiness for operation, convenience for carrying and high sensitivity.
Description
Technical field
The invention belongs to GIS class inside electric appliance particle defects detection technique field, be particularly useful for the detection of GIS kind equipment interior metal particulate.
Background technology
GIS is because its volume is little, stable, arc extinguishing ability is strong, usually for electric system key area.Yet show in GIS long-time running situation, GIS has good insulating property, but GIS inside there will be metal particle greatly to reduce its insulating property often, is the maximum hidden danger of GIS safe and stable operation.Thereby electric power research worker wishes by the charged detection method of GIS, metallic conducting particle in GIS to be removed or dangerous metal particle is controlled at safer region, avoids as far as possible and eliminate the security incident that GIS causes due to interior metal particulate.
At present, insulation defect in GIS, especially the detection method of particle defects is mainly pulse current method, ultrasonic method, ultrahigh frequency method, and these methods pair all have its unique advantage with the interior metal particle defect of GIS, and in actual GIS, aspect metal particle defect detection, have application comparatively widely.These methods do not reach office while putting starting potential for metallic conducting particle, are can not produce corona discharge phenomenon near metal particle end, just do not have partial discharge phenomenon yet.Although metal particle can be electrically charged under high field intensity effect, under electric field action, understand strong effect and take-off or motion, be referred to as " flying lustrous and transparent phenomenon ", but under alternating voltage because particulate in a power frequency period is because self gravitation affects, add the effect of particulate electric field force, although there is certain acceleration, but because alternating voltage direction in power frequency period changes, cause the particulate flight time not long, be difficult to reach high-pressure conductor surface, so detect the problems such as susceptibility deficiency that exist under alternating voltage.And metal particle is under DC voltage, because its direction of an electric field is single, thereby particulate is can the flight time when accelerating longer, thereby it clashes into GIS inside surface and have larger amplitude, and the ultrasonic vibration signal producing is also corresponding stronger.
In addition, alternating voltage, when long-term pressurization, can make GIS inner space and insulator surface stored charge, and charge accumulated likely affects insulation of electrical installation performance, thereby the present invention is directed to above problem, propose to adopt the DC voltage of reversal of poles to detect GIS interior metal particle defects.The method utilizes particulate in static and size motion ultrasonic signal amplitude level, and the existence that particulate is divided in the DC voltage research by change in polarity the ultrasonic signal pool of confirming the above two states of particulate whether, then by the DC voltage at orderly interval, eliminates the impact of the inner residual charge of GIS.
Summary of the invention
The object of the invention is to solve the practical problems of metal particle defects detection important in GIS, mainly by positive polarity and negative polarity DC voltage, by particulate, ultrasonic signal level during static and motion compares, then all kinds of quantity that chamber obtains by experiment and the horizontal collection of illustrative plates of metal particle ultrasonic signal of shape carry out Characteristic Contrast, thereby judge whether GIS inside exists metal particle.
The present invention realizes by following technical proposal.
Adopt the inner particle detection method of GIS of reversal of poles DC voltage, the present invention is at GIS(Gas Insulated Switchgear, gas insulated combined electrical equipment) internal placement metallicity particle defects, by synchronous device, control Xuan Xiang switch UNICOM positive polarity DC voltage, be applied to GIS high-pressure side and conductor thereof simultaneously, by ultrasound partial discharge tester, obtain particulate ultrasonic signal level when static, then by rubber hammer hammering GIS shell, particulate take-off, ultrasonic signal level while obtaining the particle movement of particulate when positive polarity voltage, test ultrasonic signal level difference relatively, whether assessment and the inner particulate of judgement GIS exist.Synchronous device is controlled Xuan Xiang switch UNICOM negative polarity DC voltage, by ultrasound partial discharge tester, obtain the ultrasonic signal level of particulate when static, then by rubber hammer hammering GIS shell, particulate take-off, ultrasonic signal level while obtaining the particle movement of particulate when reverse voltage, twice measuring-signal level difference relatively, whether the common assessment of comprehensive last evaluation result and judgement GIS particulate exist.In GIS test section, ultrasonic signal horizontal data storehouse before and after rubber hammer hammering while obtaining line particulate, spherical particle and the combination of multiple quantity (or length) particulate thereof, relatively obtain typical ultrasonic signal level difference and quantitative criteria thereof under positive polarity and reversed polarity DC voltage, thereby there is situation in assessment and judgement particulate, even can assess particle type and the order of magnitude thereof.Synchronous device is controlled choosing and is made GIS high-pressure side be connected to positive polarity DC voltage 1 minute to switch, then select to switch choosing to negative polarity DC voltage 1 minute, continue and so forth 10 minutes, eliminate and apply space charge that DC voltage causes and the impact of residual charge.
The invention has the beneficial effects as follows: 1) volume is little, portable, be easy to control and operation; 2) be beneficial to the metal particle defect of finding GIS inside.
Below in conjunction with accompanying drawing and example, further set forth content of the present invention.
Accompanying drawing explanation
Fig. 1 reversal of poles DC voltage particle detection method schematic diagram;
Fig. 2 reversal of poles DC voltage applies schematic diagram (for 220kVGIS).
In figure: 1, pressure regulator low pressure end; 2, pressure regulator high-pressure side; 3, choosing is to switch; 4, ground connection; 5, synchronous device; 6, high-voltage connection; 7, positive polarity DC generator low pressure end; 8, negative polarity DC generator low pressure end; 9, positive polarity DC generator high-pressure side; 10, negative polarity DC generator high-pressure side; 11, switch rotation direction; 12, switch; 13, GIS, 14, line particulate; 15, ball particulate; 16, high-pressure conductor; 17, GIS shell; 18, sonac; 19, preprocessor; 20, signal processing terminal; 21, rubber hammer.
Embodiment
The inner particle detection method of GIS that adopts reversal of poles DC voltage, method of the present invention is:
(1) GIS internal placement metallicity particle defects, by synchronous device, control Xuan Xiang switch UNICOM positive polarity DC voltage, be applied to GIS high-pressure side and conductor thereof simultaneously, by ultrasound partial discharge tester, obtain particulate ultrasonic signal level when static, then by rubber hammer hammering GIS shell, particulate take-off, ultrasonic signal level while obtaining the particle movement of particulate when positive polarity voltage, test ultrasonic signal level difference relatively, whether assessment and the inner particulate of judgement GIS exist.
(2) synchronous device is controlled Xuan Xiang switch UNICOM negative polarity DC voltage, by ultrasound partial discharge tester, obtain the ultrasonic signal level of particulate when static, then by rubber hammer hammering GIS shell, particulate take-off, ultrasonic signal level while obtaining the particle movement of particulate when reverse voltage, twice measuring-signal level difference relatively, whether the common assessment of comprehensive last evaluation result and judgement GIS particulate exist.
(3) in GIS test section, ultrasonic signal horizontal data storehouse before and after rubber hammer hammering while obtaining line particulate, spherical particle and the combination of multiple quantity (or length) particulate thereof, relatively obtain typical ultrasonic signal level difference and quantitative criteria thereof under positive polarity and reversed polarity DC voltage, thereby there is situation in assessment and judgement particulate, even can assess particle type and the order of magnitude thereof.
(4) synchronous device is controlled to select and is made GIS high-pressure side be connected to positive polarity DC voltage 1 minute to switch, then select to switch choosing to negative polarity DC voltage 1 minute, continue and so forth 10 minutes, eliminate and apply space charge that DC voltage causes and the impact of residual charge.
See Fig. 1, the figure shows reversal of poles DC voltage particle detection method schematic diagram.First the method is to be connected to choosing to switch 3 by pressure regulator high-pressure side 2, choosing is connected respectively with negative polarity DC generator low pressure end 8 and the different DC voltage of polarization from positive polarity DC generator low pressure end 7 by high-voltage connection 6 to switch 3, then the high-pressure conductor 16 at GIS 13 applies positive polarity DC voltage, and synchronous device 5 is controlled choosing and is connected for 12 same periods with switch to switch 3, because line particulate 14 or ball particulate 15 generally remain static, now by sonac 18, obtain particulate and produce ultrasonic signal level or noise level when static, then by rubber hammer 21 hammering GIS 13 shells, make particulate can depart from the viscous force on GIS 13 enclosure interior surfaces, thereby take-off, due to electric field action, particulate can be flown in GIS 13 inside, thereby constantly back and forth clash into GIS housing, thereby produce ultrasonic vibration signal, these signals that obtained by sonac 18 transfer to preprocessor 19, preprocessor is connected to signal processing terminal 20 again, then the difference of the ultrasonic signal level of and motion state more static by signal processing terminal 20, whether judgement particulate exists.In addition the difference of the ultrasonic signal level by the static and motion state under reverse voltage, combines and confirms that whether particulate exists.
See Fig. 2, the figure shows reversal of poles DC voltage and apply schematic diagram.In figure, shown that GIS 13 high-pressure conductors 16 apply the relation that positive polarity and reverse voltage replace the time, the fundamental purpose of the method is by the voltage of alternation, to inject the electric charge of opposed polarity, eliminate GIS 13 due to the impact of the charge accumulated of DC voltage generation in closed test process, thereby guarantee that GIS 13 insulation ambient conditions keep higher levels.
Claims (1)
1. the inner particle detection method of GIS that adopts reversal of poles DC voltage, is characterized in that, the method is:
(1) GIS internal placement metallicity particle defects, by synchronous device, control Xuan Xiang switch UNICOM positive polarity DC voltage, be applied to GIS high-pressure side and conductor thereof simultaneously, by ultrasound partial discharge tester, obtain particulate ultrasonic signal level when static, then by rubber hammer hammering GIS shell, particulate take-off, ultrasonic signal level while obtaining the particle movement of particulate when positive polarity voltage, test ultrasonic signal level difference relatively, whether assessment and the inner particulate of judgement GIS exist;
(2) synchronous device is controlled Xuan Xiang switch UNICOM negative polarity DC voltage, by ultrasound partial discharge tester, obtain the ultrasonic signal level of particulate when static, then by rubber hammer hammering GIS shell, particulate take-off, ultrasonic signal level while obtaining the particle movement of particulate when reverse voltage, twice measuring-signal level difference relatively, whether the common assessment of comprehensive last evaluation result and judgement GIS particulate exist;
(3) in GIS test section, ultrasonic signal horizontal data storehouse before and after rubber hammer hammering while obtaining line particulate, spherical particle or particulate combination, relatively obtain typical ultrasonic signal level difference and quantitative criteria thereof under positive polarity and reversed polarity DC voltage, thereby there is situation in assessment and judgement particulate, and particle type and the order of magnitude thereof;
(4) synchronous device is controlled to select to switch and is made GIS high-pressure side be connected to the lasting 30s-60s of positive polarity DC voltage, then select to switch choosing to continuing 30s-60s to negative polarity DC voltage, necessarily require positive polarity and negative polarity DC voltage duration strictly to equate, continue and so forth 10 minutes, eliminate and apply space charge that DC voltage causes and the impact of residual charge.
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| 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 |
| CN103941165B (en) * | 2014-04-22 | 2018-05-01 | 中国能源建设集团广东省电力设计研究院有限公司 | GIS device experimental rig and method |
| CN105527199B (en) * | 2016-01-25 | 2018-06-29 | 西安交通大学 | A kind of air-inflated metal particle research device |
| CN105910963B (en) * | 2016-04-12 | 2018-12-04 | 西安交通大学 | Metal particle research method and device based on third electrode addition space charge |
| CN107015129A (en) * | 2017-05-08 | 2017-08-04 | 中国南方电网有限责任公司电网技术研究中心 | The detecting system and method for GIS partial discharge characteristic |
| CN107329059A (en) * | 2017-07-19 | 2017-11-07 | 西安交通大学 | The superimposed voltage detection means and method of free conducting particle in a kind of GIS |
| CN107390066B (en) * | 2017-08-07 | 2020-09-11 | 中国电力科学研究院 | Method and device for judging motion state of particles of spraying layer of gas-insulated power transmission line |
| CN108435422B (en) * | 2018-03-23 | 2024-06-07 | 太以环境科技（北京）有限公司 | Atmospheric ionization mode selector |
| CN109444680A (en) * | 2018-10-23 | 2019-03-08 | 国网天津市电力公司 | GIS metal particle extent of injury judgment method |
| 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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