CN1834669A - On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof - Google Patents
On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof Download PDFInfo
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- CN1834669A CN1834669A CN 200610054229 CN200610054229A CN1834669A CN 1834669 A CN1834669 A CN 1834669A CN 200610054229 CN200610054229 CN 200610054229 CN 200610054229 A CN200610054229 A CN 200610054229A CN 1834669 A CN1834669 A CN 1834669A
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Abstract
This invention relates to gas insulation combination electric apparatus partial discharge online detecting and position equipment and its position method. It belongs to electric equipment insulation detecting technique field. This invention includes sensor array consisted by microtrip patch antenna, two groups multiple intelligence selecting switch; two amplify filter, high speed digital collector, computer and control module. The array in this invention is made up by the microtrip patch antennas fixed at GIS basin type insulator, its antenna is made up by rectangular metal patch, medium board, metal platter, coaxial probe type feed line and antenna shielding case. This invention is computer program control, it can online, actual time, quickly, actually poison of GIS inner discharging. This invention can be widely used to electric generator plant booster station and electric network GIS electric substation, it can auto detecting GIS inner partial discharge, and actually poison of partial discharging defect, also it can interconnection run with electric substation and electric generator plant auto monitoring system.
Description
Technical field
The invention belongs to the insulation of electrical installation monitoring technical field, particularly online detection and location device of local discharge of gas-insulator switchgear and localization method.
Background technology
Gas insulated combined electrical equipment (GIS) is characteristics such as compact conformation, floor area are little, reliability height because of having, and are used widely in the generating plant of electric system and transformer station.But because of the defective that a variety of causes produced, under the effect of highfield, can cause shelf depreciation (PD), and stimulating frequency can reach the electromagnetic wave of thousands of megahertzes (GHz) among the GIS.The shelf depreciation sustainable development meeting of GIS inside causes Fault of Insulating Breakdown, and the accident that causes power failure causes heavy losses to national economy.Because GIS is good wave conductor, make the electromagnetic wave can be at the GIS internal communication, and at GIS insulation basin and ring flange seam crossing to external leakage, can find inner early stage insulation defect by detecting electromagnetic wave signal.Therefore, in service at GIS, GIS is carried out on-line monitoring, in time find shelf depreciation and to defect location, be one of the safe operation that guarantees electric system, the important means that improves power supply reliability.Again because partial discharge intensity is very weak, and exist interference such as strong corona, selective interference, white noise on every side, local discharge signal is often flooded by strong electromagnetic interference (EMI), so in the online detection and location of local discharge of gas-insulator switchgear, sensor is crucial.
The existing online detection and location device of GIS shelf depreciation, as China Patent No. is Zl200420084834.7 " the online fault locator of gas insulated transformer substation local discharge superhigh frequency ", and the signal processing apparatus that signal pickup assembly, signal transmission passage, oscillograph, GPIB card and the computing machine that is made of two uhf sensors that can move freely constitutes is formed.Its uhf sensor is made up of all channel antenna, Hi-pass filter, super high frequency amplifier, wave detector and screening can.But the frequency band of its all channel antenna is 600～5000MHz, because the shelf depreciation midband is high more, its energy is more little, causes its detected amplitude less; Its pick-up unit only comprises two uhf sensors, can only be in GIS regular manual detection and the shelf depreciation location of carrying out in service.
And for example China Patent No. is that Zl200320109957.7 " a kind of ultrabroad band partial discharge detecting sensor based " is the enclosure that a bottom surface has the slit, being packaged with frequency band range in the box is the broadband detection antenna of 10～3000MHz, and antenna ends is useful on the SMA high-frequency coaxial connector of feed; The one end is connected with 50 ohm matched impedance.But because the frequency of corona discharge is usually at 100-200MHz in the air, this sensor low-frequency range is low excessively, can not overcome to detect on-the-spot strong corona interference, and influence easily is interfered.
Summary of the invention
The objective of the invention is weak point at existing online detection and location device of GIS shelf depreciation and partial discharge detecting sensor based, online detection and location device of a kind of local discharge of gas-insulator switchgear and localization method are provided, adopt micro-strip paster antenna (MPA) to form sensor array, can effectively detect local discharge signal, improve antijamming capability, online in real time positions GIS inside shelf depreciation defective accurately.
The present invention is achieved through the following technical solutions: the online detection and location device of a kind of local discharge of gas-insulator switchgear comprises the sensor array of being made up of micro-strip paster antenna, two groups of multi-way intelligence selector switch, two amplifilters, high-speed figure collector, computing machine and control modules.Sensor array of the present invention is made of the micro-strip paster antenna that is installed in each disc insulator place of GIS, and its number is by the disc insulator quantity decision of on-the-spot GIS; The multi-way intelligence selector switch is a single pole multiple throw; The high-speed figure collector comprises 2 data acquisition channels; Each sensor is connected with the multi-way intelligence selector switch by the radioshielding concentric cable of equal in length; After one group of multi-way intelligence selector switch is passed through the radioshielding concentric cable and an amplifilter is connected, be connected with a data acquisition channel of high-speed figure collector by the radioshielding concentric cable again, after another group multi-way intelligence selector switch is passed through the radioshielding concentric cable and another amplifilter is connected, be connected with another data acquisition channel of high-speed figure collector by the radioshielding concentric cable again; The high-speed figure collector is connected with computing machine by bus, and computing machine is connected with control module by bus, and control module is connected with two groups of multi-way intelligence selector switch respectively by bus.
Micro-strip paster antenna is by the rectangular metal paster; dielectric-slab; metal base plate; coaxial probe formula feeder line; the antenna protection cover is formed; at the affixed rectangular metal paster of the one side of dielectric-slab substrate; the affixed grounded metal base plate of another side; one small through hole (feedback point) is set on dielectric-slab and metal base plate; in order to insert the coaxial probe feeder line; the outer conductor of its feeder line one end is connected with the grounded metal base plate; the aperture that inner wire passes dielectric-slab and metal base plate is connected with metal patch; the other end of feeder line is connected with the radioshielding concentric cable by cable splice; the concentric cable that connects usefulness places the grounded metal floor below; can not disturb the radiation of micro-strip paster antenna face; the feedback point can be chosen in the optional position of metal patch, so that carry out impedance matching with transmission line.Micro-strip paster antenna utilizes the slit between metal patch and the metal base plate to receive electromagnetic wave, and is converted into high-frequency current.The antenna protection cover is made of metal material and epoxide resin material, adopts metal material that antenna is encapsulated at the micro-strip paster antenna back side and 1/2nd sides, and it is the epoxide resin material encapsulation of 1-3mm that the one side of close GIS disc insulator adopts thickness.
Because the pulse energy of shelf depreciation almost is directly proportional with frequency span, and micro-strip paster antenna is a narrow band antenna, the narrow-band characteristic of micro-strip paster antenna is to have the resonance person's character of its high quality factor Q to determine, the energy that promptly is stored in the antenna structure is more much bigger than radiation and other energy loss.The relative bandwidth of the micro-strip paster antenna of conventional design is about 1%～6% of centre frequency, does not satisfy the requirement of GIS Partial Discharge Detection, in order to obtain more shelf depreciation information, answers widening frequency band when design.The method of widening frequency band can go to seek from the various aspects that reduce total Q value, also can realize with additional impedance matching measure.The present invention adopts following technical method to carry out the broadening of frequency band:
(1) adopts DIELECTRIC CONSTANT
rLess medium substrate: medium substrate has been selected the lower polystyrene material of specific inductive capacity for use, and purpose is to reduce ε
r, the energy storage of antenna is because of ε
rReduce and diminish, make the Q of radiation correspondence
rReduce, thereby frequency band is broadened;
(2) adopt thick substrate: behind the selected material,, between medium substrate and metal base plate, do dielectric material, make the increase of thickness h and radiation conductance also increases, the Q of radiation correspondence thereupon with air in order further to reduce specific inductive capacity
rReduce with total Q value, make frequency band widen;
(3) adopt the additional impedance matching network: when using coaxial probe as feeder line, the impedance Z of antenna feed impedance except causing by inner chamber master mould
RAlso comprise the probe reactance X that causes by high-order mode outward,
L, i.e. Z
Ln=Z
R+ jX
LDiameter is that the probe reactance computing formula of d0 is:
In the formula: λ
0Wavelength for microstrip antenna centre frequency correspondence.
The equivalent electrical circuit of micro-strip paster antenna can be described with a RLC antiresonant circuit rice, under back of the body feedback situation, the feeder line probe can be considered a reactance, can add a series capacitance this moment, form the resonant circuit of connect with feeder line probe inductance, and make it and micro-strip paster antenna equivalent antiresonant circuit at same frequency upper resonance, near the reactance of series parallel resonance loop resonance frequency is tending towards counteracting, the rapid variation of reactance when having made it to avoid off-resonance, thus broadening frequency band.Micro-strip paster antenna frequency band of the present invention is 340MHz～440MHz, and bandwidth is 100MHz, and relative bandwidth is 25.6%, and centre frequency is 390MHz, has avoided frequency and has disturbed less than the GIS monitoring of 300MHz on-the-spot ground unrest and corona.
Micro-strip paster antenna of the present invention is on outward appearance structural design and material selection, consider that antenna will effectively receive the electromagnetic wave that leak at the disc insulator place, and the surrounding space electromagnetic interference (EMI) is suppressed, therefore adopt metal material that antenna is shielded at the micro-strip paster antenna back side and part side, it is the epoxide resin material encapsulation of 1-3mm that this of close GIS disc insulator simultaneously adopts thickness, because the directivity of micro-strip paster antenna, the electromagnetic wave that disc insulator leaks obtains maximum gain, and the undesired signal of coupling is inhibited from the side.At GIS partial discharge monitoring scene, the bracing frame that micro-strip paster antenna is made with epoxy resin is fixed on the disc insulator flange of GIS, so just in the scope of far-field region, make micro-strip paster antenna measure the leakage electromagnetic wave of local discharge generation as far as possible, when guaranteeing that simultaneously different micro-strip paster antennas is installed on the different insulators, its directivity unanimity, it is identical to receive the electromagnetic ability of superfrequency.
The micro-strip paster antenna of apparatus of the present invention is installed in each disc insulator place at interval of GIS, and the radioshielding concentric cable of several micro-strip paster antennas by equal in length is joined together to form sensor array.Because electromagnetic wave is not only the function of time, but also is the function of locus, and time-domain sampling is carried out in the output of each sensor simultaneously, just obtains the space-time two-dimensional sample of signal, it has kept the spatial information (si) and the time-domain information of signal.By comparing the amplitude of shelf depreciation discharge pulse signal on the diverse location, obtain the micro-strip paster antenna position of maximum discharge signal, can judge the position of Partial Discharge Sources roughly, on this basis, receive the mistiming and the propagation velocity of electromagnetic wave of local discharge signal according to the sensor on the diverse location, calculate the position of Partial Discharge Sources.
Multi-way intelligence selector switch of the present invention is a single pole multiple throw, by the corresponding micro-strip paster antenna of control module control backgating.Amplifilter gets enlargement factor 20dB, and frequency band range 300～500MHz is with the frequency range coupling of sensor.High-speed figure collector, computing machine and the control module of apparatus of the present invention are market and purchase part.The high-speed figure collector comprises 2 data acquisition channels at least, to be converted to digital signal by the voltage signal that concentric cable is conveyed into from amplifilter, computing machine sends instructions to control module by bus, choose in the sensor array corresponding sensor-signal to gather by control module control multi-way intelligence selector switch, computing machine is analyzed and is handled the digital signal of high-speed figure collector collection, by computer software the signal of sensor array collection is carried out analyzing and processing, thereby GIS inside Partial Discharge Sources is positioned.
The online detection and location method of a kind of local discharge of gas-insulator switchgear, sensor array, multi-way intelligence selector switch, amplifilter, high-speed figure collector, computing machine and control module that this method utilizes micro-strip paster antenna to form, carry out the software location by computer program, its method step is as follows:
(1) initialization: utilize locating device of the present invention, each micro-strip paster antenna sensor location storage spatially in computing machine, and is set timing acquiring and analyzed data time;
(2) timing acquiring local discharge signal: acquisition time then, computing machine at first takes turns micro-strip paster antenna in the gating sensor array by first group of multi-way intelligence switch of total line traffic control, start a passage of high-speed figure collector simultaneously, conversion of signals with each micro-strip paster antenna is a digital signal successively, is sent to by bus and carries out data processing in the computing machine;
(3) multiple small echo denoising: the application number that utilizes the inventor to invent is the multiple Wavelet noise-eliminating method in 200510057243.x " online detector for partial discharge of gas-insulated substation and denoising method ", adopt multiple wavelet technique that the sensor signal of gathering is carried out denoising, undesired signals such as the on-the-spot white noise that may exist, arrowband are detected in the place to go;
(4) shelf depreciation is judged: according to the composite signal amplitude that generates in the multiple small echo denoising step, noise signal amplitude with the no shelf depreciation at the detection scene measured in advance is a criterion, judge whether to take place shelf depreciation, when shelf depreciation takes place, just carry out next step signal amplitude relatively, wait for timing acquiring local discharge signal next time otherwise got back to for (2) step;
(5) signal amplitude relatively: when shelf depreciation exists, because the superfrequency electromagnetic wave has decay in communication process, the amplitude size of the detected discharge signal in more different disc insulators place in the measurement, choose the sensor of discharge signal amplitude maximum, judge that Partial Discharge Sources is nearest from its position;
(6) mistiming location: first group of fixing sensor of selecting discharge signal amplitude maximum of multi-way intelligence selector switch, another group multi-way intelligence selector switch is taken turns the sensor at gating other disc insulator place that disc insulator is adjacent therewith, the high-speed figure collector starts two data acquisition channels simultaneously, gather the sensor signal that two groups of multi-way intelligence selector switch are selected simultaneously, the local discharge signal rising edge of the sensor measurement of selecting with first group of multi-way intelligence selector switch is a trigger pip, accurately measure the mistiming Δ t of partial-discharge ultrahigh-frequency signal between rising edge of two sensors, according to the sulfur hexafluoride (SF of GIS
6) electromagnetic wave propagation speed in the medium, can calculate Partial Discharge Sources whether between these two disc insulators and the particular location between them.SF
6Specific inductive capacity be 1.002026, close with the air medium velocity, so the range difference d=c * Δ t of two sensors of discharge source distance.The information of comprehensive adjacent several disc insulators place local discharge signal can be determined concrete discharge position;
(7) show: when shelf depreciation takes place when, position and with judgment result displays at computer screen; When shelf depreciation not taking place, got back to for (2) step and wait for timing acquiring local discharge signal next time.
After the present invention adopted technique scheme, apparatus of the present invention had effective detection GIS local discharge signal, can improve the characteristics such as antijamming capability of detection system.The inventive method is monitored by on-line continuous, can position ability to GIS inside shelf depreciation defective accurately real-time.The present invention can be widely used in the GIS transformer station of power plant high voltage station and electrical network, can online automatic detection the shelf depreciation of GIS inside, and the defective that causes discharge accurately located, can also with the automatic monitored control system networking operation of transformer station, generating plant.
Description of drawings
Fig. 1 is the theory diagram of apparatus of the present invention;
Fig. 2 is the micro-strip paster antenna structural representation of apparatus of the present invention;
Fig. 3 is the scheme of installation of the micro-strip paster antenna of apparatus of the present invention;
Fig. 4 is the multi-way intelligence selector switch schematic diagram of apparatus of the present invention;
Fig. 5 is the program flow diagram of the inventive method;
Fig. 6 is the theoretical and actual measurement standing-wave ratio (SWR) curve map of the micro-strip paster antenna of present embodiment;
Fig. 7 is typical shelf depreciation waveform and the spectrogram thereof that the micro-strip paster antenna of present embodiment detects at the scene;
Fig. 8 detects the shelf depreciation oscillogram of two adjacent sensor at the scene for the micro-strip paster antenna of present embodiment.
Among the figure: 1, micro-strip paster antenna; 2, concentric cable; 3, multi-way intelligence selector switch; 4, amplifilter; 5, high-speed figure collector; 6, computing machine; 7, control module; 8, bus; 9, metal base plate; 10, dielectric-slab; 11, feeder line; 12, metal patch; 13, antenna protection cover; 14, the disc insulator of GIS; 15, the conductor of GIS; 16, the shell of GIS.
Embodiment
Below in conjunction with embodiment, further specify the present invention.
Shown in Fig. 1～4, the online detection and location device of a kind of local discharge of gas-insulator switchgear, the sensor array of forming by micro-strip paster antenna 1, two groups of multi-way intelligence selector switch 3, two amplifilters 4, high-speed figure collector 5, computing machine 6 and control modules 7.The sensor array of present embodiment is made of the micro-strip paster antenna 1 that is installed in each disc insulator 14 place of GIS, and its number is by the disc insulator 14 quantity decision of on-the-spot GIS; Multi-way intelligence selector switch 3 is a single pole multiple throw; High-speed figure collector 5 comprises 2 data acquisition channels; Each sensor is connected with multi-way intelligence selector switch 3 by the radioshielding concentric cable 2 of equal in length; After one group of multi-way intelligence selector switch 3 is passed through radioshielding concentric cable 2 and an amplifilter 4 is connected, be connected with a data acquisition channel of high-speed figure collector 5 by radioshielding concentric cable 2 again, after another group multi-way intelligence selector switch 3 is passed through radioshielding concentric cable 2 and another amplifilter 4 is connected, be connected with another data acquisition channel of high-speed figure collector 5 by radioshielding concentric cable 2 again; High-speed figure collector 5 is connected with computing machine 6 by bus 8, and computing machine 6 is connected with control module 7 by bus 8, and control module 7 is connected with two groups of multi-way intelligence selector switch 3 respectively by bus 8.
Its micro-strip paster antenna 1 is by rectangle copper metal patch 12; specific inductive capacity is 2.62 polystyrene dielectric plate 10; metal base plate 9; impedance is the coaxial probe formula feeder line 11 of 50 Ω; antenna protection cover 13 is formed; at the affixed rectangular metal paster 12 of the one side of dielectric-slab 10; the affixed grounded metal base plate 9 of another side; one small through hole (feedback point) is set on dielectric-slab 10 and metal base plate 9; in order to insert coaxial probe feeder line 11; probe diameter is 3mm; the outer conductor of its feeder line 11 1 ends is connected with grounded metal base plate 9; the aperture that inner wire passes dielectric-slab 10 and metal base plate 9 is connected with metal patch 12; the other end of feeder line 11 is connected with radioshielding concentric cable 2 by the cable splice of NK-50 Ω, and the concentric cable 2 that connects usefulness places grounded metal base plate 9 belows.Antenna protection cover 13 back sides and 1/2nd sides adopt the iron plate of 4mm that antenna is shielded, and the one side of close GIS disc insulator encapsulates with the thick thin epoxy resin substrate of 2mm.On antenna protection cover 13, back up pad is installed, its flange nut with disc insulator 14 places of GIS is connected.The micro-strip paster antenna 1 that will be installed in each disc insulator 14 place at interval of GIS then is connected to multi-way intelligence selector switch 3 by the radioshielding concentric cable 2 of equal in length.Multi-way intelligence selector switch 3 is by the control of control module 7, the GIS relevant position local discharge signal that the corresponding micro-strip paster antenna 1 of gating detects, by concentric cable 2 behind amplifilter, enter high-speed figure collector 5 by concentric cable 2, high-speed figure collector 5 is gathered local discharge signal and is converted to digital signal, by bus 8 digital signal is imported computing machine 6, computing machine 6 sends by bus 8 and instructs to control module 7, the shelf depreciation digital signal of 6 pairs of inputs of computing machine is calculated by computer software, analyze and handle, thereby GIS inside partial discharge position is accurately located.
The online detection and location device of combination of gases electrical equipment shelf depreciation of present embodiment is installed in the GIS transformer station of Chongqing 220kV, detects the inner shelf depreciation of GIS and also position, its on-the-spot testing result is as follows:
Fig. 6 is the theoretical and actual measurement standing-wave ratio (SWR) curve map of the micro-strip paster antenna of present embodiment, curve 17 is the theoretical standing-wave ratio (SWR)s before the microstrip antenna widening frequency band among the figure, curve 18 is the theoretical standing-wave ratio (SWR)s behind the widening frequency band, and curve 19 is standing-wave ratio (SWR)s of utilizing behind the widening frequency band that HP8720D standard network analyser records.As seen from the figure, the centre frequency of little band rectangular patch antenna is 390MHz, and standing-wave ratio (SWR) is 340MHz～440MHz less than 2 absolute bandwidth, and theoretical curve and measured curve are identical substantially.
Fig. 7 is typical shelf depreciation waveform and the spectrogram thereof that the micro-strip paster antenna of present embodiment detects at the scene, local discharge signal clearly as we can see from the figure, its signal amplitude is approximately 3.8mV, can satisfy the needs of Partial Discharge Detection, has higher sensitivity, its spectral range can be avoided certain arrowband and random disturbance between 200MHz～300MHz, the theoretical cutoff frequency of this and antenna matches.
Fig. 8 is for adopting apparatus of the present invention at two adjacent disc insulators 1 of No. 2 main transformer A phases of GIS transformer station, the shelf depreciation waveform that 2 places record, as seen from the figure, obtaining passage one is 72mV for the amplitude at disc insulator 1 place, passage two is 48mV for the amplitude at disc insulator 2 places, therefore judge that shelf depreciation is near disc insulator 1, signal with disc insulator 1 place when gathering waveform is a benchmark, the discharge signal time difference of two sensor acquisition is 17ns, comprehensive above-mentioned partial discharge positioning method, this discharge of tentative diagnosis are No. 2 main transformer isolating switch A phase ends of incoming cables and wall bushing junction.
As shown in Figure 4, the localization method of the online detection of a kind of local discharge of gas-insulator switchgear, sensor array, multi-way intelligence selector switch 3, amplifilter 4, high-speed figure collector 5, computing machine 6 and control module 7 that this method utilizes micro-strip paster antenna 1 to form, carry out the software location by computer program, its method step is as follows:
(1) initialization: utilize the locating device of present embodiment, each micro-strip paster antenna sensor 1 location storage spatially in computing machine 6, and is set timing acquiring and analyzed data time;
(2) timing acquiring local discharge signal: acquisition time then, computing machine 6 is at first by first group of multi-way intelligence switch of bus 8 control 3 micro-strip paster antenna 1 in the gating sensor array in turn, start a passage of high-speed figure collector 5 simultaneously, conversion of signals with each micro-strip paster antenna 1 is a digital signal successively, is sent to by bus 8 and carries out data processing in the computing machine 6;
(3) multiple small echo denoising: the application number that utilizes the inventor to invent is the multiple Wavelet noise-eliminating method in 200510057243.x " online detector for partial discharge of gas-insulated substation and denoising method ", adopt multiple wavelet technique that the sensor signal of gathering is carried out denoising, undesired signals such as the on-the-spot white noise that may exist, arrowband are detected in the place to go;
(4) shelf depreciation is judged: according to the composite signal amplitude that generates in the multiple small echo denoising step, noise signal amplitude with the no shelf depreciation at the detection scene measured in advance is a criterion, judge whether to take place shelf depreciation, when shelf depreciation takes place, just carry out next step signal amplitude relatively, wait for timing acquiring local discharge signal next time otherwise got back to for (2) step;
(5) signal amplitude relatively: when shelf depreciation exists, because the superfrequency electromagnetic wave has decay in communication process, the amplitude size of the detected discharge signal in more different disc insulators place in the measurement, choose the sensor of discharge signal amplitude maximum, judge that Partial Discharge Sources is nearest from its position;
(6) mistiming location: first group of multi-way intelligence selector switch 3 fixing sensor of selecting discharge signal amplitude maximum, another group multi-way intelligence 3 selector switch are taken turns the sensor at gating other disc insulator place that disc insulator is adjacent therewith, high-speed figure collector 5 starts two data acquisition channels simultaneously, gather the sensor signal that two groups of multi-way intelligence selector switch 3 are selected simultaneously, the local discharge signal rising edge of the sensor measurement of selecting with first group of multi-way intelligence selector switch 3 is a trigger pip, accurately measure the mistiming Δ t of partial-discharge ultrahigh-frequency signal between rising edge of two sensors, according to the sulfur hexafluoride (SF of GIS
6) electromagnetic wave propagation speed in the medium, can calculate Partial Discharge Sources whether between these two disc insulators and the particular location between them.SF
6Specific inductive capacity be 1.002026, close with the air medium velocity, so the range difference d=c * Δ t of two sensors of discharge source distance.The information of comprehensive adjacent several disc insulators place local discharge signal can be determined concrete discharge position;
(7) show: when shelf depreciation takes place when, position and with judgment result displays at computing machine 8 screens; When shelf depreciation not taking place, got back to for (2) step and wait for timing acquiring local discharge signal next time.
Claims (3)
1. online detection and location device of local discharge of gas-insulator switchgear, comprise two amplifilters (4), high-speed figure collector (5), computing machine (6) and control module (7), it is characterized in that the sensor array formed by micro-strip paster antenna (1) in addition, two groups of multi-way intelligence selector switch (3), sensor array is by being installed in micro-strip paster antenna (1) formation that each disc insulator of GIS (14) is located, its number is by disc insulator (14) the quantity decision of on-the-spot GIS, multi-way intelligence selector switch (3) is a single pole multiple throw, high-speed figure collector (5) comprises 2 data acquisition channels, each sensor is connected with multi-way intelligence selector switch (3) by the radioshielding concentric cable (2) of equal in length, after one group of multi-way intelligence selector switch (3) is passed through radioshielding concentric cable (2) and an amplifilter (4) is connected, be connected with a data acquisition channel of high-speed figure collector (5) by radioshielding concentric cable (2) again, after another group multi-way intelligence selector switch (3) is passed through radioshielding concentric cable (2) and another amplifilter (4) is connected, be connected with another data acquisition channel of high-speed figure collector (5) by radioshielding concentric cable (2) again; High-speed figure collector (5) is connected with computing machine (6) by bus (8), and computing machine (6) is connected with control module (7) by bus (8), and control module (7) is connected with two groups of multi-way intelligence selector switch (3) respectively by bus (8).
2. according to the online detection and location device of the described local discharge of gas-insulator switchgear of claim 1; it is characterized in that; described micro-strip paster antenna (1); by rectangle copper metal patch (12); dielectric-slab (10); metal base plate (9); feeder line (11); antenna protection cover (13) is formed; at the affixed rectangular metal paster of the one side of dielectric-slab (10) (12); the affixed grounded metal base plate of another side (9); on dielectric-slab (10) and metal base plate (9), a small through hole is set; the outer conductor of its feeder line (11) one ends is connected with grounded metal base plate (9); the aperture that inner wire passes dielectric-slab (10) and metal base plate (9) is connected with metal patch (12); the other end of feeder line (11) is connected with radioshielding concentric cable (2) by cable splice; the concentric cable (2) that connects usefulness places grounded metal base plate (9) below; antenna protection cover (13) back side and 1/2nd sides adopt sheet metal that antenna is shielded, and it is the epoxide resin material encapsulation of 1-3mm that the one side of close GIS disc insulator (14) adopts thickness.
3. the localization method of the online detection of local discharge of gas-insulator switchgear, sensor array, multi-way intelligence selector switch (3), amplifilter (4), high-speed figure collector (5), computing machine (6) and control module (7) that this method utilizes micro-strip paster antenna (1) to form, carry out the software location by computer program, it is characterized in that method step is as follows:
(1) initialization: utilize the locating device of present embodiment, each micro-strip paster antenna sensor (1) location storage spatially in computing machine (6), and is set timing acquiring and analyzed data time;
(2) timing acquiring local discharge signal: acquisition time then, computing machine (6) is at first by first group of multi-way intelligence switch of bus (8) control (3) micro-strip paster antenna 1 in the gating sensor array in turn, start a passage of high-speed figure collector (5) simultaneously, conversion of signals with each micro-strip paster antenna (1) is a digital signal successively, is sent in the computing machine (6) by bus (8) and carries out data processing;
(3) multiple small echo denoising: the application number that utilizes the inventor to invent is the multiple Wavelet noise-eliminating method in 200510057243.x " online detector for partial discharge of gas-insulated substation and denoising method ", adopt multiple wavelet technique that the sensor signal of gathering is carried out denoising, undesired signals such as the on-the-spot white noise that may exist, arrowband are detected in the place to go;
(4) shelf depreciation is judged: according to the composite signal amplitude that generates in the multiple small echo denoising step, noise signal amplitude with the no shelf depreciation at the detection scene measured in advance is a criterion, judge whether to take place shelf depreciation, when shelf depreciation takes place, just carry out next step signal amplitude relatively, wait for timing acquiring local discharge signal next time otherwise got back to for (2) step;
(5) signal amplitude relatively: when shelf depreciation exists, because the superfrequency electromagnetic wave has decay in communication process, the amplitude size of the detected discharge signal in more different disc insulators place in the measurement, choose the sensor of discharge signal amplitude maximum, judge that Partial Discharge Sources is nearest from its position;
(6) mistiming location: the fixing sensor of selecting discharge signal amplitude maximum of first group of multi-way intelligence selector switch (3), another group multi-way intelligence (3) selector switch is taken turns the sensor at gating other disc insulator place that disc insulator is adjacent therewith, high-speed figure collector (5) starts two data acquisition channels simultaneously, gather the sensor signal that two groups of multi-way intelligence selector switch (3) are selected simultaneously, the local discharge signal rising edge of the sensor measurement of selecting with first group of multi-way intelligence selector switch (3) is a trigger pip, accurately measure the mistiming Δ t of partial-discharge ultrahigh-frequency signal between rising edge of two sensors, according to the sulfur hexafluoride (SF of GIS
6) electromagnetic wave propagation speed in the medium, can calculate Partial Discharge Sources whether between these two disc insulators and the particular location between them; SF
6Specific inductive capacity be 1.002026, close with the air medium velocity, so the range difference d=c * Δ t of two sensors of discharge source distance.The information of comprehensive adjacent several disc insulators place local discharge signal can be determined concrete discharge position;
(7) show: when shelf depreciation takes place when, position and with judgment result displays at computing machine (8) screen; When shelf depreciation not taking place, got back to for (2) step and wait for timing acquiring local discharge signal next time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100542299A CN100363748C (en) | 2006-04-19 | 2006-04-19 | On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100542299A CN100363748C (en) | 2006-04-19 | 2006-04-19 | On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof |
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| CN1834669A true CN1834669A (en) | 2006-09-20 |
| CN100363748C CN100363748C (en) | 2008-01-23 |
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| CNB2006100542299A Expired - Fee Related CN100363748C (en) | 2006-04-19 | 2006-04-19 | On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof |
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| CN101589508A (en) * | 2006-10-09 | 2009-11-25 | 株式会社Emw天线 | A direct feeding type patch antenna |
| CN101865969A (en) * | 2010-05-26 | 2010-10-20 | 四川电力试验研究院 | Method for on-line monitoring and positioning of partial discharge of gas insulation combined electrical apparatus |
| CN102096025A (en) * | 2009-12-10 | 2011-06-15 | 上海莫克电子技术有限公司 | Local discharge detector of gas insulating switch |
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| CN103777121A (en) * | 2014-01-22 | 2014-05-07 | 上海交通大学 | Multi-band ultrahigh frequency narrow band sensor for transformer substation local discharge detecting and positioning |
| CN103969556A (en) * | 2014-03-14 | 2014-08-06 | 上海交通大学 | Insulation electrified detection device for cable accessories |
| CN104035009A (en) * | 2014-06-14 | 2014-09-10 | 国网四川省电力公司双流县供电分公司 | Insulator fault detection device enabling operator to adjust position conveniently |
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| CN105067981A (en) * | 2015-08-25 | 2015-11-18 | 胡达凯 | High sensitivity monitoring system of transformer substation |
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| CN105182194A (en) * | 2015-08-25 | 2015-12-23 | 胡达凯 | High-accuracy partial discharging signal detection system of transformer station |
| CN105223480A (en) * | 2015-10-22 | 2016-01-06 | 西安交通大学 | The Positioning Error Simulation method of aerial array time difference method location transformer station Partial Discharge Sources |
| CN105676082A (en) * | 2016-01-19 | 2016-06-15 | 华北电力大学（保定） | Internal defect detection system and method for basin-type insulator of gas insulated switchgear (GIS) |
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| JPH1186689A (en) * | 1997-09-12 | 1999-03-30 | Nissin Electric Co Ltd | Insulation diagnostic apparatus |
| JP2002148301A (en) * | 2000-11-10 | 2002-05-22 | Mitsubishi Electric Corp | Partial discharge detection device |
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| CN102759691A (en) * | 2012-07-20 | 2012-10-31 | 云南电力试验研究院（集团）有限公司电力研究院 | Positive/negative polarity direct-current high-voltage partial discharge testing system for GIS fault diagnosis |
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| CN104730426B (en) * | 2013-12-20 | 2018-11-09 | 国家电网公司 | sensor and discharge signal detection method |
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| CN105223480B (en) * | 2015-10-22 | 2018-01-19 | 西安交通大学 | The Positioning Error Simulation method of aerial array time difference method positioning transformer station Partial Discharge Sources |
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