CN105717425A - Supersonic online detection system of 1000kV GIS - Google Patents
Supersonic online detection system of 1000kV GIS Download PDFInfo
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- CN105717425A CN105717425A CN201610064002.6A CN201610064002A CN105717425A CN 105717425 A CN105717425 A CN 105717425A CN 201610064002 A CN201610064002 A CN 201610064002A CN 105717425 A CN105717425 A CN 105717425A
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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 discloses a supersonic online detection system of a 1000kV GIS, and relates to the field of electronic technology. Supersonic probes are mounted on a casing or basin-type insulator of the 1000kV GIS, and collect internal discharge signals of the GIS in real time, the signals are transmitted to an optical relay station via fibers and converted into electric signals, the electric signals are amplified, processed and stored, and then analyzed by a host computer, and display, printing and teletransmission functions are provided. The supersonic online detection system of the 1000kV GIS can be applied to the field in detecting partial discharge defect of the common 1000kV GIS, the problems as inaccurate positioning and slow response of a traditional detection method are effectively solved, and the system of the invention is worthy of popularization and use widely.
Description
Technical field
The present invention relates to a kind of extra-high voltage equipment detection method for local discharge technical field, especially relate to a kind of 1000kVGIS ultrasound wave on-line detecting system.
Background technology
Shelf depreciation is the electric discharge phenomena occurred in regional area in metal enclosed gas insulated combined electrical equipment (GIS), if shelf depreciation long-term existence, it will would cause the destruction of insulation, thus cause GIS internal generation penetrability to puncture.Wide variety of GIS partial discharge supersonic detection device in electrical network at present, it is possible to realize the detection to internal discharge in GIS runs and be accurately positioned, timely discovering device hidden danger is had important function.
But lack necessary technological means at present and realize the real-time monitoring system to GIS equipment partial discharge situation, this is the most unfavorable to evaluation and the repair based on condition of component of equipment actual operating state, thus cannot reach optimization balance between power network safety operation and equipment interruption maintenance.
The open one of the patent of Application No. 201410049395.4 is applicable to the internal partial discharge positioning method of UHV winding and device, includes successively by the data flow order of connection: Distributed Feedback Laser, optical fiber polarizer integration module, single-phase three post parallel-connection structure propagation circuits, optical fiber analyzer integration module, PIN photoelectric detector and processing module, 16 path partially electric discharge synchronous detecting systems, the internal shelf depreciation alignment system of UHV winding；Built-in 16 fiber-optic current sensor unit in single-phase three post parallel-connection structure propagation circuits, obtain local discharge signal proportionate relationship, and analyze and external value side bushing, the linked character of the local discharge signal of network side sleeve and iron core grounding, it is achieved converter power transformer Partial Discharge Testing on Site disturbs the identification of signal and multicolumn parallel-connection network side and the location of valve side discharge source.Can discriminating device insulation status effectively, be provided that foundation for expert's comprehensive assessment extra-high voltage converter degeneration.
The open a kind of AC extra high voltage main transformer modulation associating partial discharge test system of the patent of Application No. 201510106402.4, including variable-frequency power sources, testing transformer, compensation reactor, capacitive divider, partial discharge detecting system, and regulating compensation transformator and AC extra high voltage main body transformator, the outfan of variable-frequency power sources is connected with the low-pressure side of testing transformer, the high-pressure side of testing transformer is connected with the low-pressure side of regulating compensation transformator, the high-pressure side of regulating compensation transformator is connected with the low-pressure side of AC extra high voltage main body transformator, shunt compensation reactor and capacitive divider between testing transformer and regulating compensation transformator, AC extra high voltage main body transformator and regulating compensation transformator are respectively arranged with partial discharge detecting system.
But, concrete condition for extra-high voltage, it may appear that different limitation, so the ultrasonic signal when present invention produces by analyzing shelf depreciation, in conjunction with the concrete condition of Current electronic information technology, a kind of 1000kVGIS ultrasound wave on-line detecting system global design scheme is proposed.
Summary of the invention
In view of this, it is an object of the invention to for the deficiencies in the prior art, it is provided that a kind of 1000kVGIS ultrasound wave on-line detecting system, solve existing 1000kVGIS shelf depreciation defects detection means location inaccuracy, sluggish problem.
For reaching above-mentioned purpose, the present invention is by the following technical solutions: 1000kVGIS ultrasound wave on-line detecting system, described detecting system includes gathering front end, information process unit and software processes display unit, described collection front end is connected with described software processes display unit by described information process unit, described collection front end includes some ultrasonic detecting probes, described detection probe top arranges reference sensor, and described detection probe bottom arranges photoelectric conversion module.
Further, described reference sensor receives local discharge signal GIS within and is converted to signal transmission through fiber to optical transmitter and receiver, transmitting the central control machine to far-end after integrated amplifier amplification in described optical transmitter and receiver；In described central control machine, passage distributed type high speed data collecting system received local discharge signal it is analyzed and is uploaded to monitoring system of electric substation.
Further, described reference sensor uses the external sensor of piezoceramic material, utilizes the direct piezoelectric effect of piezoelectric ceramics to produce alternating electric field, and acoustical signal is converted to the signal of telecommunication under the mechanical stress effect that generation is put in office.
Further, described integrated amplifier is the preamplifier of adjustable gain, and its input connects two coupling electric capacity respectively and two earth resistances constitute high pass filter and filter low frequency noises.
Further, in described information process unit, after the sampled signal received is passed through the process of analog signal processing by reference sensor, then isolate analog signal digital with high-speed a/d converter through RF coupler；Last digital signal conversion come by DS again reads and is stored in RAM.
Further, described software processes display unit includes the PC being provided with client software, described client software uses specialist system to carry out Data Analysis Services, integrated use digital filtering, the anti-interference method of dynamic threshold, eliminate or suppress noise jamming, it is possible to realize simultaneously to the synchronous acquisition of multiplex ultrasonic signal, transmit, filter, analyze, report to the police, electric discharge type identification, discharge position location, electric discharge trend analysis, two and three dimensions chart display printing function.
Further, the programming language of described client software is based on LABBVIEW or C language.
Further, the localization method of described detecting system is, GIS partial discharge is with corresponding ultrasonic pulse, sonac receive the time of same electric discharge sound wave because the installation site on GIS is different difference, the available acoustoelectric signal time difference produced carries out space orientation to it, and by the time difference of certain identical signal, amplitude are carried out synchronous recording, obtain the distance away from multiple sensors, by the combinative analysis of required distance being determined the coordinate of shelf depreciation.
The invention has the beneficial effects as follows:
A kind of 1000kVGIS ultrasound wave on-line detecting system that the present invention provides, including discharge capacity collection, signal amplifies, filter, process, transmission and display unit, fully apply the internal shelf depreciation system principle of GIS, ultrasonic method is used to carry out detection and localization, not only energy consumption is low, pollution-free, and it is fast and accurate for positioning, simultaneously, the discharge signal that low-frequency resonant formula sensor acquisition is arrived, pre-amplifier unit is set, thus obtain bigger gain, in order to prevent interference, make signal transmission undistorted, process signal and can realize Phototube Coupling transmission by light-repeating ship and central control room rack, and finally export to high-speed data acquisition card and carry out data process.The present invention meets the needs of bad working environments, and by multichannel distributed type high speed data acquisition processing system based on DSP and CPLD, even at the rather harsh operating mode such as strong motion, strong electromagnetic, also the impact that detection data are produced by on-the-spot strong electromagnetic environment it is effectively reduced, practical implementation is respond well, should be widely promoted and use.
Accompanying drawing explanation
Fig. 1 is the ultrasound wave on-line detecting system block diagram of the present invention.
Fig. 2 is the local on-line detecting system structure principle chart of the present invention.
Fig. 3 is integrated amplifier circuit diagram of the present invention.
Fig. 4 is that information process unit of the present invention forms structure chart.
Fig. 5 is GIS ultrasonic measurement system circuit theory diagrams in simulation experiment of the present invention.
Fig. 6 is the first insulation defect gray-scale map in simulation experiment of the present invention.
Fig. 7 is the second insulation defect gray-scale map in simulation experiment of the present invention.
Fig. 8 is the third insulation defect gray-scale map in simulation experiment of the present invention.
Fig. 9 is the 4th kind of insulation defect gray-scale map in simulation experiment of the present invention.
Detailed description of the invention
The 1000kVGIS ultrasound wave on-line detecting system of the present invention to be realized, need to solve three technical problems, first technical problem to be solved by this invention, it is exactly the ultrasonic method internal shelf depreciation system principle of detection GIS, amplifies including discharge capacity collection, signal, filter, process, transmit and display unit；Second technical problem to be solved by this invention, it is simply that obtain bigger gain how low-frequency resonant formula NU40A18TR sensor acquisition to discharge signal being carried out pre-amplifier unit；3rd technical problem to be solved by this invention, it is simply that multichannel distributed type high speed data acquisition processing system based on DSP and CPLD.
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figures 1 to 9, solve above-mentioned first technical problem, the present invention adopts the following technical scheme that ultrasonic Method for Measuring principle and local discharge system figure as shown in Figure 1 and Figure 2, reference sensor is arranged on GIS shell, GIS will not be run and operation produces any impact, it generally measures 20 ~ 100KHZ frequency range, the interference signal in the external world can be rejected, obtain preferable signal to noise ratio, electromagnetism interference performance is good, principle simply can realize discharge classification identification and location, it is easy to accomplish on-line monitoring.1000KV GIS shell or disc insulator are installed and sets ultrasound probe.Including some ultrasonic detecting probes, probe top is provided with reference sensor, and bottom is provided with photoelectric conversion module, and reference sensor receives the local discharge signal within GIS and is converted to signal transmission through fiber to optical transmitter and receiver.Detecting system key component is reference sensor, light-repeating ship, integrated amplifier, multichannel data acquisition system and upper computer software etc..
Solve above-mentioned second technical problem, the present invention uses following scheme: high sensor is bigger to Partial Discharge Detection influential effect, the NU40A18TR external sensor that system uses piezoelectric ceramics to be material, the direct piezoelectric effect utilizing piezoelectric ceramics under the mechanical stress effect that generation is put in office produces alternating electric field, and sonic transducer is converted into the signal of telecommunication.Utilize this reference sensor to receive GIS surface produce mechanical vibration, its sensitivity be more than-80 dB, frequency band between 17 to 220 kilo hertzs, resonant frequency 40 kilo hertzs.
Owing to during ultrasonic propagation, decay is very fast, it is thus desirable to select the pre-amplifier unit that gain is bigger, as shown in Figure 3, pre-amplification circuit uses the preamplifier AD620 of adjustable gain, its input connects earth resistance R1, R2 composition high pass filter of two 0.1 F coupling electric capacity and 100k and filters low frequency noises, and pin 4, pin 7 are connected with power supply, and pin 5 connects with ground, pin 1, pin 8 are attached with resistance Rg, and Rg is the resistance that gain can regulate.From the frequency of Fig. 7 AD620 and gain corresponding relation figure, ensureing that signal obtains maximum gain in the case of undistorted, Rg takes 210 and meets frequency 40
KHz left-right signal testing requirement, just can obtain gain G.
Solve above-mentioned 3rd technical problem, the present invention uses following scheme: these signal optical fiber are also transferred to light-repeating ship by ultrasonic probe Real-time Collection GIS discharge signal, after being converted into the signal of telecommunication after amplifying, processing and store, it is analyzed processing in fact by upper computer software, and display is provided, prints and teletransmission, the sampled signal that reference sensor receives is by isolating analog signal digital with high-speed a/d converter through RF coupler after the process of analog signal processing again；Last digital signal conversion come by DSP again reads and is stored in RAM, as shown in Figure 4.
CPLD uses Altera company EPM7128S (PLCC84) chip, and DSP uses the DSP TMS320C6713 of TI company.Multichannel distributed type high speed data collecting system based on DSP and CPLD is capable of the data that the multiple reference sensor of collection site detects simultaneously.Under the effect of Logic control module CPLD, dsp control signal can produce synchronous sampling signal, controls the collection of unlike signal, and analog-to-digital conversion module carries out sampling and A/D changes.Data in each modulus capture card are read and stored in RAM by DSP, remove noise jamming and sample analysis work completes the most in dsp, finally by network interface, data after process are sent to host computer.
From simulation experiment effect, effect of the present invention is verified first below, utilize the ultrasound wave of above-mentioned design to supervise detecting system online and GIS model is detected, according to setting up test circuit system shown in Fig. 5.Wherein transformator uses power frequency testing transformer 200B4M-380V/1000kV；Current limliting filtering impedance R is industrial frequency experiment protective resistance (GR1000-1/6)；Reference sensor is NU40A18TR low-frequency resonant formula sensor.
4 kinds of insulation defects it are respectively provided with: be the root length copper wire simulation outthrust defect that is about 12 on conducting rod inside GIS model, insulator surface is stained with the copper wire simulation attachment defect of diameter 0.2, epoxy resins insulation rod arranges one be about 15, surface sealed analog insulation void defects again after a diameter of 10 holes, simulate particle defects with the Thin Rectangular aluminium flakes of several about 2 × 2 square millimeters and 2 × 3 square millimeters.Slowly raising test voltage in process of the test, examine the signal in oscillograph and waveform, ultrasonic partial discharge test device detects the gray-scale map that discharges as shown in Figures 6 to 9.
Fig. 6 insulator void defects is on the positive half cycle of phase place and negative half period has electric discharge phenomena, and positive half cycle is many compared with the shelf depreciation of negative half period point sum, relative pulse amplitude is big.The gray-scale map ratio that Fig. 7 insulator attachment pollutant defect shelf depreciation produces is relatively decentralized, discharges inconspicuous when voltage is relatively low, and shelf depreciation number of times distribution in phase place is wider, and discharge characteristics is the most inconspicuous.The shelf depreciation gray-scale map of Fig. 8 free metal microgranule is comparatively concentrated, discharge time is the most more concentrated, positive half cycle and negative half period all have electric discharge phenomena, the point of discharge of positive half cycle and negative half period basis equalization, and Amplitude Ration interior insulator air blister defect amplitude that negative half period discharges is a little big.Shelf depreciation concentrates between 20 °～60 ° and 180 °～260 °, shows as periodically fluctuating, has good symmetry.In Fig. 9 metallic projections defect gray-scale map, it can be seen that the most all there are electric discharge phenomena at the positive half cycle of power frequency and negative half period, more less at 0 °～60 ° of discharge capacities, but start substantially to electric discharge phenomena when 240 °～360 °, and amplitude of discharging also becomes greatly.
By experiment test, without any electrical link between reference sensor and GIS, not by electrical Interference, PD can be positioned by time interval.By increasing sensor gain and using band filter to reduce the impact of extraneous different frequency characteristic oscillation factor, in fault type detects, metal tip, free granule, the defects such as electricity that suspend had relatively high sensitivity.
In actual applications, on 03 12nd, 2013 12:30, certain ultra-high voltage transformer station #1 main transformer 1000KV side GIS combination electric appliance C is separated by and connects between stacked cell and bus air chamber the electric discharge of disc insulator flashover, dead electricity after the switch trip of #1 main transformer three side, causes Central China's part power network fluctuation.12:24 ultrasound wave on-line detecting system sends warning signal, C phase C-T1 channel discharge amount reaches 146pC, pulse number 233, C-T1 passage is and is arranged on C and is separated by and connects the ultrasound probe of disc insulator between stacked cell and bus air chamber, judges that display electric discharge type is that disc insulator discharges by detection.Owing to fault current is relatively big, #1 main transformer protection action GIS device has a power failure, and electric discharge phenomena disappear, and are acquired so being merely able to electric discharge initial stage signal；Between-failures GIS is turned strip inspection after maintenance, finds that long and deep crackle occurs in interior insulator, consistent with ultrasonic wave detecting system testing result.
Finally illustrate is, above example is only in order to illustrate technical scheme and unrestricted, other amendment or equivalents that technical scheme is made by those of ordinary skill in the art, without departing from the spirit and scope of technical solution of the present invention, all should contain in the middle of scope of the presently claimed invention.
Claims (8)
1.1000kVGIS ultrasound wave on-line detecting system, described detecting system includes gathering front end, information process unit and software processes display unit, described collection front end is connected with described software processes display unit by described information process unit, it is characterized in that: described collection front end includes some ultrasonic detecting probes, described detection probe top arranges reference sensor, and described detection probe bottom arranges photoelectric conversion module.
2. 1000kVGIS ultrasound wave on-line detecting system as claimed in claim 1, it is characterized in that: described reference sensor receives local discharge signal GIS within and is converted to signal transmission through fiber to optical transmitter and receiver, transmitting the central control machine to far-end after integrated amplifier amplification in described optical transmitter and receiver；In described central control machine, passage distributed type high speed data collecting system received local discharge signal it is analyzed and is uploaded to monitoring system of electric substation.
3. 1000kVGIS ultrasound wave on-line detecting system as claimed in claim 1 or 2, it is characterized in that: described reference sensor uses the external sensor of piezoceramic material, the direct piezoelectric effect utilizing piezoelectric ceramics under the mechanical stress effect that generation is put in office produces alternating electric field, and acoustical signal is converted to the signal of telecommunication.
4. 1000kVGIS ultrasound wave on-line detecting system as claimed in claim 2, it is characterized in that: described integrated amplifier is the preamplifier of adjustable gain, its input connects two coupling electric capacity respectively and two earth resistances constitute high pass filter and filter low frequency noises.
5. 1000kVGIS ultrasound wave on-line detecting system as claimed in claim 3, it is characterized in that: in described information process unit, after the sampled signal received is passed through the process of analog signal processing by reference sensor, then isolate analog signal digital with high-speed a/d converter through RF coupler；Last digital signal conversion come by DS again reads and is stored in RAM.
6. 1000kVGIS ultrasound wave on-line detecting system as claimed in claim 5, it is characterized in that: described software processes display unit includes being provided with the PC of client software, described client software uses specialist system to carry out Data Analysis Services, integrated use digital filtering, the anti-interference method of dynamic threshold, eliminate or suppress noise jamming, it is possible to realize simultaneously to the synchronous acquisition of multiplex ultrasonic signal, transmit, filter, analyze, report to the police, electric discharge type identification, discharge position location, electric discharge trend analysis, two and three dimensions chart display printing function.
7. 1000kVGIS ultrasound wave on-line detecting system as claimed in claim 6, it is characterised in that: the programming language of described client software is based on LABBVIEW or C language.
8. 1000kVGIS ultrasound wave on-line detecting system as claimed in claim 7, it is characterized in that: the localization method of described detecting system is, GIS partial discharge is with corresponding ultrasonic pulse, sonac receive the time of same electric discharge sound wave because the installation site on GIS is different difference, the available acoustoelectric signal time difference produced carries out space orientation to it, and by the time difference of certain identical signal, amplitude are carried out synchronous recording, obtain the distance away from multiple sensors, by the combinative analysis of required distance being determined the coordinate of shelf depreciation.
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| CN106932698A (en) * | 2017-04-26 | 2017-07-07 | 三峡大学 | A kind of livewire work device of transmission line composite insulator defects detection |
| CN107422232A (en) * | 2017-06-20 | 2017-12-01 | 国网山东省电力公司诸城市供电公司 | A kind of digital live detection instrument of power distribution network terminal equipment |
| CN110763959A (en) * | 2019-09-24 | 2020-02-07 | 武汉汉源既济电力有限公司 | High-voltage switch cabinet partial discharge detection circuit and detection method thereof |
| CN112462216A (en) * | 2020-11-30 | 2021-03-09 | 国网山西省电力公司朔州供电公司 | Multi-frequency-band combined type discharge detection system |
| CN112763867A (en) * | 2020-12-23 | 2021-05-07 | 深圳供电局有限公司 | GIS multifrequency section ultrasonic wave partial discharge sensor |
| CN113189452A (en) * | 2021-03-11 | 2021-07-30 | 西安交通大学 | GIS latent metal particle detection device based on external vibration excitation |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405351A (en) * | 2016-11-03 | 2017-02-15 | 合肥华义电气科技有限公司 | Partial discharge detection system for switch cabinet |
| CN106932698A (en) * | 2017-04-26 | 2017-07-07 | 三峡大学 | A kind of livewire work device of transmission line composite insulator defects detection |
| CN107422232A (en) * | 2017-06-20 | 2017-12-01 | 国网山东省电力公司诸城市供电公司 | A kind of digital live detection instrument of power distribution network terminal equipment |
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| CN112462216A (en) * | 2020-11-30 | 2021-03-09 | 国网山西省电力公司朔州供电公司 | Multi-frequency-band combined type discharge detection system |
| CN112763867A (en) * | 2020-12-23 | 2021-05-07 | 深圳供电局有限公司 | GIS multifrequency section ultrasonic wave partial discharge sensor |
| CN112763867B (en) * | 2020-12-23 | 2023-06-20 | 深圳供电局有限公司 | GIS multiband ultrasonic wave partial discharge sensor |
| CN113189452A (en) * | 2021-03-11 | 2021-07-30 | 西安交通大学 | GIS latent metal particle detection device based on external vibration excitation |
| 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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Application publication date: 20160629 |