CN103197206A - Electrical level scanning type ultrahigh frequency partial discharge on-line monitoring system and monitoring method - Google Patents
Electrical level scanning type ultrahigh frequency partial discharge on-line monitoring system and monitoring method Download PDFInfo
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Abstract
The invention discloses an electrical level scanning type ultrahigh frequency partial discharge on-line monitoring system and a monitoring method. The system comprises a receiving module, a scanning collection module, an indication module and a recognition module, wherein the receiving module is used for receiving a partial discharge ultrahigh frequency pulse signal of electrical equipment, the scanning collection module is used for carrying out on-spot digitization processing on the partial discharge ultrahigh frequency pulse signal in real time under the indication of the indication module so that partial discharge characteristic data are obtained, and the recognition module is used for recognizing insulation states of the electrical equipment based on the partial discharge characteristic data. Thus, the partial discharge ultrahigh frequency pulse signal is collected, the on-spot digitization processing is conducted on the partial discharge ultrahigh frequency pulse signal so that the partial discharge characteristic data are extracted, then the partial discharge characteristic data in a digital signal type are analyzed to recognize the insulation states of the electrical equipment, data volume in the whole monitoring process is small, operation is fast, processing on an integral discharge wave signal is not needed, signal attenuation and signal distortion are avoided, and therefore on-line monitoring on partial discharge of the electrical equipment can be achieved.
Description
Technical field
The invention belongs to electric system partial discharge monitoring technical field, relate in particular to a kind of level scan-type high-frequency local discharging on-line monitoring system and method.
Background technology
Shelf depreciation is the non-penetrability electric discharge phenomena that cause owing to local defect in the insulating medium, it is electrical equipments such as transformer, SF6 gas insulated combined electrical equipment (GIS, Gas Insulated Substation), high-tension switch cabinet, cable produce insulation defect in the long-play process an important sign.The local defect that electrical equipment produces in manufacturing and operational process, as bubble, crack, suspension metallic particles and electrode burr etc., can cause electrical equipment under certain running status, partial discharges fault to take place, if shelf depreciation continues to take place for a long time, the insulating property of equipment will be badly damaged, and then can cause catastrophic electric fault to take place.Therefore, shelf depreciation is monitored the insulation fault of timely discovery electrical equipment, the safe and stable operation that guarantees electrical equipment is had important practical significance.
At present, mainly adopting the UHF(ultrahigh frequency, Ultra High Frequency) method carries out partial discharge monitoring to electrical equipment.When existing UHF method is carried out partial discharge monitoring to electrical equipment, at first utilize high-speed collection card to gather the local discharge signal overall waveform of electrical equipment, import the local discharge signal overall waveform data of gathering for example that apparatus such as computer carries out information analysis again, judge the state of insulation of electrical equipment at last according to analysis result.But obviously there is following shortcoming in above-mentioned UHF method: owing to need gather, handle and analyze the local discharge signal overall waveform of electrical equipment, data volume is huge, thereby when causing utilizing the monitoring equipment operation of UHF method owing to data volume is difficult to data are handled in real time greatly, and the high-speed collection card collection is simulating signal, need cable to carry out longer Distance Transmission, thereby cause signal attenuation, and then the real time data that causes being difficult to shelf depreciation is handled, to sum up, existing UHF method should not realize the on-line monitoring of shelf depreciation.
This shows, a kind of partial discharge monitoring system or method are provided, realize local discharge of electrical equipment is carried out on-line monitoring, with the insulation fault of timely discovery electrical equipment, prevent that the power equipment accident from taking place, and becomes this area problem demanding prompt solution.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of level scan-type high-frequency local discharging on-line monitoring system and method, to realize that local discharge of electrical equipment is carried out on-line monitoring, judge the inside electric appliance state of insulation timely and accurately, and then prevent that the power equipment accident from taking place, ensure the power system safety and stability operation.
For this reason, the invention provides following technical scheme:
A kind of level scan-type high-frequency local discharging on-line monitoring system comprises receiver module, scanning collection module, indicating module and identification module, wherein:
Described receiver module is for the local discharge superhigh frequency pulse signal of surveying and receive electrical equipment;
Described scanning collection module is used under the indication of described indicating module, in real time described local discharge superhigh frequency pulse signal is carried out in-situ digitalization and handles, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment;
Described identification module is used for analyzing by the discharge characteristic data to described shelf depreciation, identifies the state of insulation of described electrical equipment.
Preferably, described receiver module comprises N sensor: No. 1～N sensor, for the local discharge superhigh frequency pulse signal of surveying and receive electrical equipment;
Described N is not less than 1 natural number.
Preferably, the indication of described indicating module comprises to be set monitoring parameter and sends trigger pip, and wherein: the monitoring parameter that described indicating module is set comprises number between comparative level, phase region, scanning power frequency period number, signal amplification factor and sensor number;
Described scanning collection module, receive described trigger pip, under the triggering of described trigger pip, in real time described local discharge superhigh frequency pulse signal is carried out in-situ digitalization based on described monitoring parameter and handle, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment.
Preferably, described scanning collection module comprises FPGA, multi-way switch, filter amplifier, D/A converter and comparer, wherein:
Described FPGA, link to each other with described indicating module, be used for after receiving the trigger pip that described indicating module sends, the monitoring parameter based on described indicating module sets carries out corresponding control to described multi-way switch, filter amplifier, comparer and D/A converter;
Described multi-way switch links to each other with a described N sensor, is used under the control of described FPGA, connects and is numbered the sensor that sets sensor number;
Described filter amplifier, link to each other with a described N sensor by described multi-way switch, be used under the control of described FPGA, the local discharge superhigh frequency pulse signal that the sensor that described multi-way switch is connected receives carries out filtering and amplifies and handle, and with filtering and the local discharge superhigh frequency pulse signal after amplify handling input to described comparer, wherein, the signal amplification factor of enlargement factor for setting;
Described D/A converter is used under the control of described FPGA the comparative level of setting being converted to simulating signal, and the comparative level of described analog signal form is inputed to described comparer;
Described comparer, be used under the control of described FPGA, based on number between the phase region of setting and scanning power frequency period number, local discharge superhigh frequency pulse signal after described filtering and the amplification processing and the comparative level of described analog signal form are compared, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment, and preserve described discharge characteristic data by described FPGA.
Preferably, described identification module comprises discharge spectrogram drawing unit, computing unit and pattern recognition unit, wherein:
Described discharge spectrogram drawing unit is used for based on described discharge characteristic data, draws the discharge spectrogram;
Described computing unit is used for based on described discharge spectrogram, calculates the discharge characteristic amount of described shelf depreciation;
Described pattern recognition unit is used for carrying out pattern-recognition according to described discharge characteristic amount, to identify the state of insulation of described electrical equipment.
Preferably, described level scan-type high-frequency local discharging on-line monitoring system, also comprise fault diagnosis and alarm module, described fault diagnosis and alarm module are used for judging, diagnosing according to the state of insulation of electrical equipment the failure condition of electrical equipment, and failure condition is carried out Realtime Alerts.
A kind of level scan-type high-frequency local discharging on-line monitoring method comprises: survey and receive electric
The local discharge superhigh frequency pulse signal of equipment;
Under default indication, described local discharge superhigh frequency pulse signal is carried out in-situ digitalization handle, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment;
Analyze by the discharge characteristic data to described shelf depreciation, identify the state of insulation of described electrical equipment.
Preferably, describedly analyze by the discharge characteristic data to described shelf depreciation, the state of insulation of identifying described electrical equipment specifically comprises:
Based on described discharge characteristic data, draw the discharge spectrogram;
Based on described discharge spectrogram, calculate the discharge characteristic amount of described shelf depreciation;
Carry out pattern-recognition according to described discharge characteristic amount, to identify the state of insulation of described electrical equipment.
Preferably, described level scan-type high-frequency local discharging on-line monitoring method also comprises:
State of insulation according to electrical equipment is judged, the failure condition of diagnosis electrical equipment, and failure condition is carried out Realtime Alerts.
The level scan-type high-frequency local discharging on-line monitoring system that the embodiment of the invention provides has comprised receiver module, scanning collection module, indicating module and identification module.Be different from existing UHF method and gather the complete discharge waveform signal of shelf depreciation by adopting high-speed collection card, follow-up simulated data according to a large amount of complete discharge waveform signal of gathering is extracted the state of insulation that discharge characteristic is identified electrical equipment, the present invention utilizes receiver module to gather the local discharge superhigh frequency pulse signal of electrical equipment, when implementing, specifically can adopt as devices such as antenna sensors and obtain the local discharge superhigh frequency pulse signal, and the present invention is after having gathered the local discharge superhigh frequency pulse signal of electrical equipment, utilizing the scanning collection module in real time discharge pulse signal to be carried out in-situ digitalization handles, signal attenuation and distortion have been avoided, and the follow-up state of insulation that can analyze to identify electrical equipment by identification module to the discharge characteristic data of digital signal form, data volume is little, and computing is fast.
As seen, the present invention is by gathering the local discharge superhigh frequency pulse signal of electrical equipment, and the pulse signal of gathering is carried out real-time in-situ digitalization handle extraction discharge characteristic data, follow-up discharge characteristic data to digital signal form are analyzed the state of insulation of identification electrical equipment, whole observation process data volume is little, computing is fast, need not the complete discharge waveform signal of shelf depreciation is handled, analyze, and signal attenuation and distortion have been avoided, thereby the invention solves the defective of existing UHF method, can realize local discharge of electrical equipment is carried out on-line monitoring, judge the inside electric appliance state of insulation timely and accurately, and then prevented that the power equipment accident from taking place, and ensured the power system safety and stability operation.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the level scan-type high-frequency local discharging on-line monitoring system that provides of the embodiment of the invention one;
Fig. 2 is the structural representation of the scanning collection module that provides of the embodiment of the invention one;
Fig. 3 is certain defective local discharge signal ultra-high frequency signal synoptic diagram that oscillograph captures after filtering is amplified that the embodiment of the invention one provides;
Fig. 4 is the course of work process flow diagram of the level scan-type high-frequency local discharging on-line monitoring system that provides of the embodiment of the invention one;
Fig. 5 is the another kind of structural representation of the level scan-type high-frequency local discharging on-line monitoring system that provides of the embodiment of the invention two;
Fig. 6 is a kind of schematic flow sheet of the level scan-type high-frequency local discharging on-line monitoring method that provides of the embodiment of the invention three;
Fig. 7 is the another kind of schematic flow sheet of the level scan-type high-frequency local discharging on-line monitoring method that provides of the embodiment of the invention three;
Fig. 8 (a) is that the embodiment of the invention four provides
The discharge spectrogram;
Fig. 8 (b) is that the embodiment of the invention four provides
The discharge spectrogram;
Fig. 8 (c) is that the embodiment of the invention four provides
The discharge spectrogram;
Fig. 9 is the discharge the inquiry of historical data interface that the embodiment of the invention four provides.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Should not realize this shortcoming of on-line monitoring of shelf depreciation at existing UHF method, the invention discloses a kind of level scan-type high-frequency local discharging on-line monitoring system and method, below will describe in detail to level scan-type high-frequency local discharging on-line monitoring system and the method for invention by a plurality of embodiment.
Embodiment one
The embodiment of the invention one discloses a kind of structure of level scan-type high-frequency local discharging on-line monitoring system, sees also Fig. 1, and this structure comprises receiver module 100, scanning collection module 200, indicating module 300 and identification module 400, wherein:
Wherein, for realizing carrying out in real time monitoring synchronously to many complete equipments or with the many places of complete equipment, monitoring system of the present invention designs receiver module 100 based on distributed principle, receiver module 100 comprises N the sensor that is numbered No. 1～N number, surveys and receive the local discharge superhigh frequency pulse signal of electrical equipment by N sensor.N is not less than 1 natural number, particularly, the numerical value of N can be decided according to the monitoring requirements of electrical equipment by the technician, for example, can or determine the numerical value of N with the position number of the shelf depreciation that needs in the cover electrical equipment to monitor according to the tricks of the electrical equipment of needs monitorings.Owing to consider that there is decay in discharge signal in communication process, so when the monitoring local discharge signal, exist sensor to avoid decay near making discharge source, present embodiment comes detectable signal by some sensors of installing on the electrical equipment of need monitoring more, avoids the decay of signal as far as possible.More specifically, present embodiment is installed in the local discharge signal that receives electrical equipment on the electrical equipment equally spacedly with antenna as sensor, certainly be not limited to above-mentioned equally spaced mounting means when sensor installation or antenna among the present invention, concrete mounting means is decided by the field monitoring demand.
Described scanning collection module 200 is used under the indication of indicating module 300, in real time described local discharge superhigh frequency pulse signal is carried out in-situ digitalization and handles, with the discharge characteristic data of the shelf depreciation that draws electrical equipment.
Wherein, the indication of indicating module 300 comprises to be set monitoring parameter and sends trigger pip, and the monitoring parameter that indicating module 300 is set comprises number between comparative level, phase region, scanning power frequency period number, signal amplification factor and sensor number.The trigger pip that scanning collection module 200 concrete reception indicating modules 300 send, under the triggering of described trigger pip, in real time the local discharge superhigh frequency pulse signal is carried out in-situ digitalization based on described monitoring parameter and handle, with the discharge characteristic data of the shelf depreciation that draws electrical equipment.
See also Fig. 2, the scanning collection module comprises FPGA(Field-Programmable Gate Array, field programmable gate array) 201, multi-way switch 202, filter amplifier 203, D/A(Digital/Analog, digital-to-analog) converter 204 and comparer 205, wherein: FPGA201 links to each other with indicating module 300, be used for after the trigger pip that receives indicating module 300, monitoring parameter based on indicating module 300 sets carries out corresponding control to multi-way switch 202, filter amplifier 203, D/A converter 204 and comparer 205; Multi-way switch 202 links to each other with N sensor, is used under the control of FPGA201, connects and is numbered the sensor that sets sensor number; Filter amplifier 203, link to each other with N sensor by multi-way switch 202, be used under the control of FPGA201, the local discharge superhigh frequency pulse signal that the sensor that multi-way switch 202 is connected receives carries out filtering and amplifies and handle, and with filtering and the local discharge superhigh frequency pulse signal after amplify handling input to comparer 205, wherein, the signal amplification factor of enlargement factor for setting; D/A converter 204 is used under the control of FPGA201 the comparative level of setting being converted to simulating signal, and the comparative level of analog signal form is inputed to comparer 205; Comparer 205, be used under the control of FPGA201, based on number between the phase region of setting and scanning power frequency period number, local discharge superhigh frequency pulse signal after filtering and the amplification processing and the comparative level of analog signal form are compared, with the discharge characteristic data of the shelf depreciation that draws electrical equipment, and preserve described discharge characteristic data by FPGA201.
In the present embodiment, specifically realize the function of indicating module 300 and identification module 400 by industrial computer.Carry out communication by Ethernet between industrial computer and the scanning collection module 200.Scanning collection module 200 is positioned near scene and the sensor, and real-time implementation signal in-situ digitalization adopts digital signal to carry out communication afterwards, and carries out communication by Ethernet and industrial computer, has avoided the decay of signal.
Form and the function of each ingredient based on the structure of above-described scanning collection module 200, below the principle of work of scanning collection module 200 under the indication of industrial computer described in detail:
FPGA201 receives the monitoring parameter of industrial computer input, and after receiving the trigger pip of industrial computer, concrete as after receiving the trigger command or triggering command of industrial computer, carry out respective handling work based on other modules in the monitoring parameter gated sweep acquisition module of setting 200; Under the control of FPGA201, filter amplifier carries out filter amplifying processing with the local discharge superhigh frequency pulse signal that collects, handle the undesired signal that suppresses below the 300MHz by filtering, and the local discharge superhigh frequency pulse signal after the filter amplifying processing is inputed to comparer 205; FPGA201 converts comparative level to simulating signal by D/A converter 204 and inputs in the comparer 205, and each power frequency period is divided into number between the phase region of setting, and distributes a memory address by FPGA201 between each phase region; FPGA201 triggers by external power frequency fixed phase waveform, and in each triggering cycle, comparer compares partial discharge pulse's amplitude and comparative level interior between each phase region; FPGA201 is according to situation relatively afterwards, amplitude is added up and is stored on the memory address corresponding between each phase region greater than the number of the partial discharge pulse of comparative level, the number of the power frequency period that compares is counted by the counter that FPGA carries, when reaching the setting number, stop comparison, and will compare the gained data and return to industrial computer; Industrial computer changes the numerical value of comparative level automatically according to preset algorithm, and reset comparative level, the process of corresponding component repeating above said collection, filtering amplification, comparison, storage and return data in the beacon scanning acquisition module 200, when being increased to a certain comparative level, the partial discharge pulse greater than this comparative level does not exist, at this moment, this comparative level is approximately equal to the maximum voltage amplitude of partial discharge pulse, FPGA201 is according to situation relatively, stored the discharge characteristic data of shelf depreciation, and the discharge characteristic data are back to industrial computer the most at last.
Need to prove that industrial computer and the FPGA201 on backstage communicate, it is mainly by background program control data transmission and processing capacity between the two.The particularly control of comparative level, the preset algorithm that changes the numerical value employing of comparative level can be that equal difference increases progressively, and also can be that index increases progressively.
Wherein, identification module 400 comprises discharge spectrogram drawing unit, computing unit and pattern recognition unit.Described discharge spectrogram drawing unit is used for based on the discharge characteristic data, draws the discharge spectrogram; Described computing unit is used for based on the discharge spectrogram of drawing, and calculates the discharge characteristic amount of shelf depreciation; Described pattern recognition unit is used for carrying out pattern-recognition according to the discharge characteristic amount, to identify the state of insulation of electrical equipment.
Particularly, industrial computer is by with the scanning collection module communication and finish once that to gather what obtain be the matrix of the capable m row of n, this matrix comprises the most of feature on the signal time domain, the matrix that comprises the discharge characteristic data that industrial computer will receive saves as a form, ask for an interview as following table 1, wherein that form vertically is comparative level (V1～Vn); Be that (1～m), power frequency period is equally divided between m phase region between phase region laterally; The data Nab of table the inside represents to go up between b phase region the pulse number greater than comparative level Va.By extracting the data of this form, can draw the discharge spectrogram, particularly, can draw
,
,
Spectrogram, wherein,
Expression discharge phase, q represent to discharge amplitude (discharge capacity), n represented the number greater than the discharge pulse of comparative level.And then can calculate the discharge characteristic amount according to the discharge spectrogram of drawing, finally judge the state of insulation of electrical equipment to be used for pattern-recognition.
Table 1
The mode that pattern-recognition can adopt binary tree and support vector machine to combine, proper vector are selected average u, deviations, measure of skewness S for use
k, steepness K
u, pulse amplitude factor Q, phase place degree of asymmetry φ, cross-correlation coefficient cc and correction statistical characteristic values such as cross-correlation coefficient mcc.Be well known to those skilled in the art owing to judge the state of insulation of electrical equipment by pattern-recognition, describe in detail so locate no longer module to be identified the process of judging the insulation of electrical installation state.
To sum up, based under the power-frequency voltage effect, the feature of local discharge of electrical equipment signal has periodicity and the statistical of operating frequency phase.Be that defective is under the power-frequency voltage effect, can reignition between specific phase region, and the maximum amplitude of each discharge is constant substantially, by the discharge signal of many power frequency period of continuous statistics, just can count phase propetry and the discharge amplitude range of discharge.The present invention sums up the discharge characteristic rule of electrical equipment under the power-frequency voltage effect, propose first by a series of regular comparative levels signal to be carried out current potential relatively, namely by comparative level scanning discharge signal, obtain phase place and the amplitude Characteristics of local discharge signal, draw
Deng the discharge spectrogram.
Ask for an interview Fig. 3, certain defective local discharge signal ultra-high frequency signal that oscillograph captures after filtering is amplified has been shown among Fig. 3, wherein, horizontal ordinate is represented phase place, and ordinate is represented voltage magnitude.Signal has twice discharge respectively near 90 ° and 265 °, amplitude is about 250mV.As shown in the figure, if use different comparative level V1, the signal of V2, V3 to carry out current potential relatively, then can draw the discharge amplitude of signal between V2, V3.By reducing differential between the comparative level, can extract the size of discharge amplitude exactly.Simultaneously, if power frequency period is divided between 360 phase regions, and for distributing the memory address of depositing pulse number between each phase region.When reading data, just can obtain between the phase region of each discharge so, and be accurate to 1 °.
Referring to Fig. 4, level scan-type high-frequency local discharging on-line monitoring system of the present invention to the process that electrical equipment carries out partial discharge monitoring is:
S41: signal receives.
Particularly, antenna equidistantly can be installed in and receive local discharge signal on the electrical equipment, have antenna near making discharge source, to avoid the decay of signal as far as possible.On engineering, the long bus of the every 20m of GIS is installed a sensor.
S42: trigger command is set and provided to parameter.
Industrial computer is set detected parameters and is provided trigger command to begin to gather.Wherein, parameter is set and is comprised number between comparative level input, phase region, scanning power frequency period number, signal amplification factor and sensor number.
S43: Signal Pretreatment.
The local discharge superhigh frequency pulse signal that collects is carried out filtering handle, suppress the following undesired signal of 300MHz, afterwards, again the local discharge superhigh frequency pulse signal is amplified the back input comparator.
S44: relatively storage.
FPGA converts comparative level to simulating signal by the D/A change-over circuit and inputs in the comparer, and the control comparer compares local discharge superhigh frequency pulse signal and comparative level.Simultaneously, FPGA is according to situation relatively, amplitude is added up and is stored on the memory address corresponding between each phase region greater than the number of the partial discharge pulse of comparative level, the number of the power frequency period that compares is counted by the counter that FPGA carries, when reaching the setting number, stop comparison; And will compare the gained data and return to industrial computer.
S45: variate is storage relatively also.
Industrial computer changes the numerical value of comparative level automatically by preset algorithm, repeats above-mentioned steps S41～S44, and when being increased to a certain comparative level, the discharge pulse greater than this comparative level does not exist, and when specifically implementing, can not realize by the mode of condition circulation.
S46: data are handled, the state of insulation of identification electrical equipment.
By the data that are received from FPGA are handled, pattern-recognition, judge the state of insulation of electrical equipment.
In sum, the level scan-type high-frequency local discharging on-line monitoring system that the embodiment of the invention provides has comprised receiver module 100, scanning collection module 200, indicating module 300 and identification module 400.Be different from existing UHF method and gather the complete discharge waveform signal of shelf depreciation by adopting high-speed collection card, follow-up simulated data according to a large amount of complete discharge waveform signal of gathering is extracted the state of insulation that discharge characteristic is identified electrical equipment, the present invention utilizes receiver module 100 to gather the local discharge superhigh frequency pulse signal of electrical equipment, when implementing, specifically can adopt as devices such as antenna sensors and obtain the local discharge superhigh frequency pulse signal, and the present invention is after having gathered the local discharge superhigh frequency pulse signal of electrical equipment, utilizing scanning collection module 200 in real time discharge pulse signal to be carried out in-situ digitalization handles, signal attenuation and distortion have been avoided, and the follow-up state of insulation that can analyze to identify electrical equipment by the discharge characteristic data of 400 pairs of digital signal form of identification module, data volume is little, and computing is fast.
As seen, the present invention is by gathering the local discharge superhigh frequency pulse signal of electrical equipment, and the pulse signal of gathering is carried out real-time in-situ digitalization handle extraction discharge characteristic data, follow-up discharge characteristic data to digital signal form are analyzed the state of insulation of identification electrical equipment, whole observation process data volume is little, computing is fast, need not the complete discharge waveform signal of shelf depreciation is handled, analyze, and signal attenuation and distortion have been avoided, thereby the invention solves the defective of existing UHF method, can realize local discharge of electrical equipment is carried out on-line monitoring, judge the inside electric appliance state of insulation timely and accurately, and then prevented that the power equipment accident from taking place, and ensured the power system safety and stability operation.
Embodiment two
On the basis of embodiment one, present embodiment two discloses the another kind of structure of level scan-type high-frequency local discharging on-line monitoring system, see also Fig. 5, it is except comprising the included receiver module 100 of monitoring system described in the embodiment one, scanning collection module 200, indicating module 300 and identification module 400, also comprise fault diagnosis and alarm module 500, this fault diagnosis and alarm module 500 are used for judging, diagnosing according to the state of insulation of electrical equipment the failure condition of electrical equipment, and failure condition is carried out Realtime Alerts.
During concrete enforcement, the technician can utilize various spectrum analysis, carries out fault diagnosis.Comprise the order of severity and the development trend analyzing and predict the shelf depreciation defective, the discharge abnormal conditions are carried out Realtime Alerts, in time to avoid the generation of electrical hazard.And the invention is not restricted to the above function, start basic functions such as monitoring and whole observation process robotization as discharge development trend figure, monitoring and alarming result historical query, report generation and alarm settings, continuous monitoring, timing automatic can also be provided as required.
Because other ingredients of the embodiment of the invention two disclosed level scan-type high-frequency local discharging on-line monitoring systems and each ingredient of embodiment one disclosed level scan-type high-frequency local discharging on-line monitoring system are identical, specifically ask for an interview the explanation of relevant portion among the embodiment one, no longer describe in detail herein.
Embodiment three
The embodiment of the invention three discloses a kind of level scan-type high-frequency local discharging on-line monitoring method, and it is corresponding with embodiment one, two disclosed level scan-type high-frequency local discharging on-line monitorings, sees also Fig. 6, and said method comprises the steps:
S1: the local discharge superhigh frequency pulse signal of surveying and receive electrical equipment.
S2: under default indication, described local discharge superhigh frequency pulse signal is carried out in-situ digitalization handle, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment.
S3: analyze by the discharge characteristic data to described shelf depreciation, identify the state of insulation of described electrical equipment.
Wherein, above-mentioned steps S3 specifically comprises: based on described discharge characteristic data, draw the discharge spectrogram; Based on described drafting discharge spectrogram, calculate the discharge characteristic amount of described shelf depreciation; Carry out pattern-recognition according to described discharge characteristic amount, to identify the state of insulation of described electrical equipment.
Referring to Fig. 7, above-mentioned level scan-type high-frequency local discharging on-line monitoring method also can comprise the steps:
S4: the state of insulation according to electrical equipment is judged, the failure condition of diagnosis electrical equipment, and failure condition is carried out Realtime Alerts.
It is fairly simple that present embodiment three disclosed level scan-type high-frequency local discharging on-line monitoring methods are described, it is corresponding with embodiment one, the online prison of two disclosed level scan-type high-frequency local dischargings system, relevant similarity sees also the explanation among embodiment one or the embodiment two, repeats no more herein.
Embodiment four
The embodiment of the invention four provides and has utilized the present invention electrical equipment to be carried out an application example of partial discharge monitoring on the basis of above three embodiment.
Particularly, adopting an operation PD(partial discharge, shelf depreciation) 3 ultra-high frequency antennas of notebook computer, scanning collection module and the configuration of artificial intelligence analysis software are installed on on-the-spot realization of electrical equipment electrical equipment are carried out partial discharge monitoring.Notebook computer connects the scanning collection module by netting twine, realizes controls such as multidiameter option switch, signal amplification, comparative level and collection period number, and receives the data of scanning collection module.The scanning collection module mainly cooperates by high-speed comparator and FPGA to be finished, and realizes obtaining discharge peak value and pulse number on the corresponding phase interval by comparative level scanning discharge signal.The scanning collection module connects 3 ultra-high frequency antennas, these 3 antennas all have independently scanning collection passage, can gather simultaneously, are used for the discharge source location, the antenna frequency band and the filtered band that adopt are 300MHz～750MHz, and system can be sensitive accepts signal in this frequency band range.Be installed on on-the-spot above-mentioned monitoring equipment and can realize following function:
(1) basic parameter and various statistical nature parameters such as the amplitude of measurement local discharge signal, phase place, discharge pulse number.
(2) demonstration two dimension (
,
), three-dimensional (
) spectrogram of projection discharge essential informations such as discharge spectrogram, very color gray-scale map, discharge development trend figure.
(3) by various spectrum analysis, carry out fault diagnosis.Specifically comprise the order of severity and the development trend analyzing and predict the shelf depreciation defective, the discharge abnormal conditions are carried out Realtime Alerts etc.
(4) provide discharge development trend figure, monitoring and basic functions such as alarming result historical query, report generation and alarm settings.
(5) but continuous monitoring or timing automatic start monitoring, whole observation process robotization.
The idiographic flow that carries out partial discharge monitoring based on the said equipment is: at notebook computer initial comparative level is set, and each power frequency period number of gathering, monitoring parameters such as the enlargement factor of amplifier input to FPGA with monitoring parameter after configuring.And give trigger pip, trigger sweep acquisition module work: partial discharge pulse and the initial comparative level of antenna collection are compared, record is greater than the umber of pulse of comparative level, and is stored in fixing phase bit address successively, the array that obtains extracted be back to notebook computer then.Notebook computer increases the comparative level value afterwards, repeat above process, until not greater than the pulse existence of comparative level, just withdraw from circulation, particularly, can whether be 0 to determine whether withdrawing from circulation greater than the umber of pulse of comparative level by what judge that continuous several times extracts.At last, the data that notebook computer will be received from FPGA are stored as a form, draw the discharge spectrogram according to form, and then judge the state of insulation of electrical equipment.
In this application example, the final discharge spectrogram of drawing as shown in Figure 8, wherein, Fig. 8 (a), Fig. 8 (b) and Fig. 8 (c) are respectively
The discharge spectrogram,
The discharge spectrogram and
The discharge spectrogram, Fig. 9 shows the inquiry of historical data interface.Can the more obvious state of insulation that reflects electrical equipment intuitively by above discharge spectrogram, by the database of setting up, can inquire about the discharge spectral data of any monitoring point, as can be seen from Figure 9 monitoring point 1 is at 2011-03-23 17:26:45, there are a large amount of discharges to exist at positive-negative half-cycle peak value place, this monitoring point shelf depreciation exceeds standard, and should in time handle.
By the explanation that above each embodiment does level scan-type high-frequency local discharging on-line monitoring system of the present invention and method, be not difficult to draw, the present invention has following beneficial effect:
1. utilize high-speed collection card to gather the local discharge signal overall waveform of electrical equipment at existing UHF method, data volume is big, should not realize this shortcoming of on-line monitoring, the present invention need not utilize high-speed collection card, but adopt sensor to gather the pulse signal of shelf depreciation, and by high-speed comparator and high performance programmable logic device (PLD) FPGA) in-situ digitalization of realization discharge pulse signal, integrated level height, computing velocity are fast, can handle in real time, realize the on-line monitoring of shelf depreciation.
2. monitoring system reliability height of the present invention, highly sensitive, antijamming capability is strong, can realize obtaining of shelf depreciation φ-q, φ-n, φ-q-n spectrogram, detect, record, analyze the inner shelf depreciation event that takes place of GIS in real time, follow the tracks of the shelf depreciation development trend.And system can be installed on all types of high voltage electric equipments and carry out partial discharge monitoring, comprises transformer, GIS, high-tension switch cabinet etc.
3. at the simulating signal of existing monitoring method owing to the longer Distance Transmission collection of employing cable, and cause this shortcoming of signal attenuation, near the scanning collection module that the present invention's employing is installed in the sensor is carried out the in-situ digitalization processing to the discharge pulse that obtains, and by the Ethernet transmission of digital signals, decay and the distortion of signal have been avoided.
4. because the frequency range that the UHF method is measured is 300MHz～3GHz, require the A/D converter of monitoring equipment configuring high-frequency rate, the signal transmission is centralized, and needs the magnanimity high speed storing, causes whole monitoring equipment expensive.Monitoring system of the present invention is simple in structure, volume is little, and is with low cost; Simple to operate, be easy to carry, can be fit to the needs of unconventional detection, and save manpower and manufacturing cost greatly, can significantly improve work efficiency, reduce to measure cost, easy to utilize.
5. system of the present invention can realize carrying out in real time monitoring synchronously to many complete equipments or with the many places of complete equipment, and the system extension performance is good based on distributed principle.
Need to prove that each embodiment in this instructions all adopts the mode of going forward one by one to describe, what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the application and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that the application's technical scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the application or embodiment.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a level scan-type high-frequency local discharging on-line monitoring system is characterized in that, comprises receiver module, scanning collection module, indicating module and identification module, wherein:
Described receiver module is for the local discharge superhigh frequency pulse signal of surveying and receive electrical equipment;
Described scanning collection module is used under the indication of described indicating module, in real time described local discharge superhigh frequency pulse signal is carried out in-situ digitalization and handles, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment;
Described identification module is used for analyzing by the discharge characteristic data to described shelf depreciation, identifies the state of insulation of described electrical equipment.
2. level scan-type high-frequency local discharging on-line monitoring system according to claim 1 is characterized in that described receiver module comprises N sensor: No. 1～N sensor is used for surveying and receiving the local discharge superhigh frequency pulse signal of electrical equipment;
Described N is not less than 1 natural number.
3. level scan-type high-frequency local discharging on-line monitoring system according to claim 2, it is characterized in that, the indication of described indicating module comprises to be set monitoring parameter and sends trigger pip, and wherein: the monitoring parameter that described indicating module is set comprises number between comparative level, phase region, scanning power frequency period number, signal amplification factor and sensor number;
Described scanning collection module, receive described trigger pip, under the triggering of described trigger pip, in real time described local discharge superhigh frequency pulse signal is carried out in-situ digitalization based on described monitoring parameter and handle, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment.
4. level scan-type high-frequency local discharging on-line monitoring system according to claim 3 is characterized in that described scanning collection module comprises FPGA, multi-way switch, filter amplifier, D/A converter and comparer, wherein:
Described FPGA, link to each other with described indicating module, be used for after receiving the trigger pip that described indicating module sends, the monitoring parameter based on described indicating module sets carries out corresponding control to described multi-way switch, filter amplifier, comparer and D/A converter;
Described multi-way switch links to each other with a described N sensor, is used under the control of described FPGA, connects and is numbered the sensor that sets sensor number;
Described filter amplifier, link to each other with a described N sensor by described multi-way switch, be used under the control of described FPGA, the local discharge superhigh frequency pulse signal that the sensor that described multi-way switch is connected receives carries out filtering and amplifies and handle, and with filtering and the local discharge superhigh frequency pulse signal after amplify handling input to described comparer, wherein, the signal amplification factor of enlargement factor for setting;
Described D/A converter is used under the control of described FPGA the comparative level of setting being converted to simulating signal, and the comparative level of described analog signal form is inputed to described comparer;
Described comparer, be used under the control of described FPGA, based on number between the phase region of setting and scanning power frequency period number, local discharge superhigh frequency pulse signal after described filtering and the amplification processing and the comparative level of described analog signal form are compared, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment, and preserve described discharge characteristic data by described FPGA.
5. level scan-type high-frequency local discharging on-line monitoring system according to claim 4 is characterized in that, described identification module comprises discharge spectrogram drawing unit, computing unit and pattern recognition unit, wherein:
Described discharge spectrogram drawing unit is used for based on described discharge characteristic data, draws the discharge spectrogram;
Described computing unit is used for based on described discharge spectrogram, calculates the discharge characteristic amount of described shelf depreciation;
Described pattern recognition unit is used for carrying out pattern-recognition according to described discharge characteristic amount, to identify the state of insulation of described electrical equipment.
6. according to the described level scan-type of claim 1～5 high-frequency local discharging on-line monitoring system, it is characterized in that, also comprise fault diagnosis and alarm module, described fault diagnosis and alarm module are used for judging, diagnosing according to the state of insulation of electrical equipment the failure condition of electrical equipment, and failure condition is carried out Realtime Alerts.
7. a level scan-type high-frequency local discharging on-line monitoring method is characterized in that, comprising:
Survey and receive the local discharge superhigh frequency pulse signal of electrical equipment;
Under default indication, described local discharge superhigh frequency pulse signal is carried out in-situ digitalization handle, with the discharge characteristic data of the shelf depreciation that draws described electrical equipment;
Analyze by the discharge characteristic data to described shelf depreciation, identify the state of insulation of described electrical equipment.
8. level scan-type high-frequency local discharging on-line monitoring method according to claim 7 is characterized in that, describedly analyzes by the discharge characteristic data to described shelf depreciation, and the state of insulation of identifying described electrical equipment specifically comprises:
Based on described discharge characteristic data, draw the discharge spectrogram;
Based on described discharge spectrogram, calculate the discharge characteristic amount of described shelf depreciation;
Carry out pattern-recognition according to described discharge characteristic amount, to identify the state of insulation of described electrical equipment.
9. according to claim 7 or 8 described level scan-type high-frequency local discharging on-line monitoring methods, it is characterized in that, also comprise:
State of insulation according to electrical equipment is judged, the failure condition of diagnosis electrical equipment, and failure condition is carried out Realtime Alerts.
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| CN111929541A (en) * | 2020-07-02 | 2020-11-13 | 广东电网有限责任公司 | Multi-azimuth partial discharge detection method |
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| CN114280433A (en) * | 2021-12-02 | 2022-04-05 | 西南交通大学 | Transformer bushing partial discharge risk assessment method based on amplification circuit |
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