CN103901330A - Partial discharge on-line monitoring method for XLPE cable - Google Patents
Partial discharge on-line monitoring method for XLPE cable Download PDFInfo
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Abstract
The invention discloses a partial discharge on-line monitoring method for an XLPE cable. The partial discharge on-line monitoring method comprises the data acquisition step, wherein a real-time voltage signal on an earth wire of a corresponding XLPE cable is acquired through a sensor; the data summarization step, wherein the real-time voltage signal is summarized to an acquisition card through a signal distribution box; the data processing step, wherein an industrial personal computer calls the real-time voltage signal from the acquisition card and conducts filter processing on the real-time voltage signal; the data storage step, wherein the real-time voltage signal on which the filter processing is conducted is stored in a data base to form history voltage data; the data analyzing step, wherein a specialist system conducts analysis on the history voltage data and extracts a feature parameter to form a feature map. By means of the partial discharge on-line monitoring method for the XLPE cable, the insulation state of the XLPE cable can be effectively monitored, and the feasible method is provided for on-line detection and monitoring of the XLPE cable.
Description
Technical field
The present invention relates to a kind of XLPE cable partial discharge monitoring method.
Background technology
The quality of crosslinked polyethylene (XLPE) cable insulation is the key factor that affects cable security reliability service, in the actual moving process of cable, find, most of cable fault is because deteriorated causing occurs cable insulation, past, the widely used preventive trial of China is to adopt the method that regularly has a power failure and test, and belongs to offline inspection.But along with the development of electric power supply, the classic method of this power failure test more and more can not adapt to the actual needs of electrical production and supply.Therefore study on-line monitoring of cable technology, can be in time to cable reasonably safeguard, inspect and change, to guaranteeing that cable reliability service has great importance.
In recent years, in order to ensure the safe operation of cable, China had also obtained certain development on cable insulation on-line monitoring technique.The on-line monitoring method of cable mainly contains DC component method, DC superposition method, shelf depreciation method and low frequency method of superposition etc.These methods of developed countries have obtained applying more widely, accumulate rich experience, China's on-line monitoring technique is at the early-stage, many scholars, expert and research unit carry out follow-up study to external monitoring technology and method, in cable insulation on-line monitoring field, domestic also had a large amount of relevant paper and achievement in research, but the on-line monitoring method of input actual motion is also little at present.Therefore be necessary to study and develop a kind of XLPE cable partial discharge monitoring method, to meet electric power and the industrial and mining enterprises testing requirement to cable insulation, provide in advance the deteriorated early warning information of cable, to prevent trouble before it happens, in advance defective cable is changed or processed, avoid the generation of pernicious ground connection and short trouble.
In the process puncturing in XLPE cable insulation ag(e)ing, all there is transient process in ground wire electric current and insulation resistance, insulation capacitance curve, and before transient process, electric current is almost constant, and after transition, electric current increases sharply.Reason is because cable insulation is all finally punctured by electric branch, and only has in the time that cable destruction is greater than a certain degree, and in cable, concentrating of electric field just can be caused electric branch, and electric current in insulation is increased rapidly.Crosslinked polyethylene (XLPE) cable in insulation ag(e)ing until in the process puncturing, the variation of ground wire electric current has certain trend, along with the development of cable local ageing, the various relation curves of ground wire electric current all exist significantly " transitional period ", before the transitional period, electric current is steady, increase sharply at transitional period after-current, therefore, this " transitional period " can regard cable breakdown fault " early warning phase " as, once entering " early warning phase ", cable also just means that cable insulation enters aging period, should take measures early.
Summary of the invention
The object of the invention is in order to overcome the deficiencies in the prior art, a kind of XLPE cable partial discharge monitoring method is provided, can effectively monitor the state of insulation of XLPE cable, for online detection and the supervision of XLPE cable provide practicable method, help user to find as early as possible the potential insulation defect of cable, arrange ahead of time inspection and maintenance, thereby make powered operation safety, reliable, electrical equipment is safeguarded timely, reduced the loss, reduce production costs.
A kind of technical scheme that realizes above-mentioned purpose is: a kind of XLPE cable partial discharge monitoring method, comprises the following steps:
S1, data collection steps, obtains the real-time voltage signal on the ground wire of corresponding XLPE cable to be measured by sensor;
S2, data aggregation step, described real-time voltage signal is aggregated into capture card by signal distributor box;
S3, data processing step, industrial computer is transferred described real-time voltage signal from described capture card, and described real-time voltage signal is carried out to filtering processing;
S4, data storing step, the described real-time voltage signal of processing is after filtering kept in database, history of forming voltage data;
S5, data analysis step, expert system is analyzed described historical voltage data, extracts characteristic parameter, forms characteristic spectrum.
In a kind of above-mentioned XLPE cable partial discharge monitoring method, described data processing step comprises the following steps:
S301, real-time voltage signal is transferred step, and described industrial computer is transferred described real-time voltage signal from described capture card;
S302, bandpass filtering treatment step, described industrial computer carries out bandpass filtering treatment to the described real-time voltage signal of transferring;
S303, FFT filtering treatment step, described industrial computer carries out the filtering processing of the Suppression of narrow band interference algorithm based on FFT to the described real-time voltage signal through bandpass filtering treatment;
S304, wavelet filtering treatment step, described industrial computer is to carrying out the filtering processing of the denoising algorithm based on small echo through the described real-time voltage signal of FFT filtering processing;
S305, NN filtering treatment step, described industrial computer is to carrying out the filtering processing of the filtering algorithm based on neural network through the described real-time voltage signal of wavelet filtering processing.
In a kind of above-mentioned XLPE cable partial discharge monitoring method, described characteristic parameter in described data analysis step comprises threshold value, arrowband Partial discharge signal, maximum pd quantity, mean discharge magnitude, average discharge current, all square rate, NQN and discharge time, wherein:
Described threshold value, the lower limit of pulse amplitude is put in effective office;
Described arrowband Partial discharge signal, the peak value of data signal in certain narrowband frequency range is put in office;
Described maximum pd quantity, the maximal value that in single power frequency period, pulse amplitude is put in office;
Described mean discharge magnitude, the mean value of pulse amplitude is put in the interior office of single power frequency period;
Described average discharge current, flows through the average current of described sensor side resistance;
Described all square rates, the equal number formulary value that pulse amplitude is put in office;
Described NQN, i.e. standardized discharge time;
, in single power frequency period, there is the number of times discharging in described discharge time.
In a kind of above-mentioned XLPE cable partial discharge monitoring method, described characteristic spectrum in described data analysis step comprises maximum pd quantity phase resolved plot, mean discharge magnitude phase resolved plot, discharge time phase resolved plot, electric discharge amplitude distribution collection of illustrative plates, discharge energy distribution collection of illustrative plates and three-dimensional φ-Q-N collection of illustrative plates, wherein:
Described maximum pd quantity phase resolved plot, represents the maximum pd quantity between each phase region;
Described mean discharge magnitude phase resolved plot, represents the mean discharge magnitude between each phase region;
Described discharge time phase resolved plot, represents the discharge time between each phase region;
Described electric discharge amplitude distribution collection of illustrative plates, the statistics of the discharge time of expression to different amplitudes;
Described discharge energy distribution collection of illustrative plates, the statistics of the discharge energy of expression to different amplitudes;
Described three-dimensional φ-Q-N collection of illustrative plates, reflects the relation between discharge capacity, discharge time and discharge phase all sidedly.
A kind of XLPE cable partial discharge monitoring method of the present invention beneficial effect is compared with prior art: by monitoring curent change on the ground wire of XLPE cable to be measured as differentiating the aging characteristic signal of cable insulation, can effectively monitor the state of insulation of XLPE cable, for online detection and the supervision of XLPE cable provide practicable method, help user to find as early as possible the potential insulation defect of cable, arrange ahead of time inspection and maintenance, thereby make powered operation safety, reliably, electrical equipment is safeguarded timely, reduce the loss, reduce production costs, can meet electric power and the industrial and mining enterprises testing requirement to cable insulation, provide in advance the deteriorated early warning information of cable, to prevent trouble before it happens, in advance defective cable is changed or processed, avoid the generation of pernicious ground connection and short trouble, accuracy is high.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of a kind of XLPE cable partial discharge monitoring method of the present invention;
Fig. 2 is the process flow diagram of data processing step of the present invention.
Embodiment
The present inventor is in order to understand technical scheme of the present invention better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
Refer to Fig. 1, embodiments of the invention, a kind of XLPE cable partial discharge monitoring method, comprises the following steps:
S1, data collection steps, obtains the real-time voltage signal on the ground wire of corresponding XLPE cable to be measured by sensor;
S2, data aggregation step, real-time voltage signal is aggregated into capture card by signal distributor box;
S3, data processing step, industrial computer is transferred described real-time voltage signal from described capture card, and described real-time voltage signal is carried out to filtering processing; Data processing step specifically comprises the following steps:
S301, real-time voltage signal is transferred step, and industrial computer is transferred described real-time voltage signal from capture card;
S302, bandpass filtering treatment step, industrial computer carries out bandpass filtering treatment to the real-time voltage signal of transferring;
S303, FFT filtering treatment step, industrial computer carries out the filtering processing of the Suppression of narrow band interference algorithm based on FFT to the described real-time voltage signal through bandpass filtering treatment;
S304, wavelet filtering treatment step, industrial computer is to carrying out the filtering processing of the denoising algorithm based on small echo through the described real-time voltage signal of FFT filtering processing;
S305, NN filtering treatment step, industrial computer is to carrying out the filtering processing of the filtering algorithm based on neural network through the described real-time voltage signal of wavelet filtering processing.
S4, data storing step, the described real-time voltage signal of processing is after filtering kept in database, history of forming voltage data;
S5, data analysis step, expert system is analyzed described historical voltage data, extracts characteristic parameter, forms characteristic spectrum.
S5, the described characteristic parameter in data analysis step comprises threshold value, arrowband Partial discharge signal, maximum pd quantity, mean discharge magnitude, average discharge current, all square rate, NQN and discharge time, wherein:
Threshold value, the lower limit of pulse amplitude is put in effective office;
Arrowband Partial discharge signal, the peak value of data signal in certain narrowband frequency range is put in office;
Maximum pd quantity, the maximal value that in single power frequency period, pulse amplitude is put in office;
Mean discharge magnitude, the mean value of pulse amplitude is put in the interior office of single power frequency period;
Average discharge current, flows through the average current of described sensor side resistance;
All square rates, the equal number formulary value that pulse amplitude is put in office;
NQN, i.e. standardized discharge time;
, in single power frequency period, there is the number of times discharging in discharge time.
S5, described characteristic spectrum in data analysis step comprises maximum pd quantity phase resolved plot, mean discharge magnitude phase resolved plot, discharge time phase resolved plot, electric discharge amplitude distribution collection of illustrative plates, discharge energy distribution collection of illustrative plates and three-dimensional φ-Q-N collection of illustrative plates, wherein:
Maximum pd quantity phase resolved plot, represents the maximum pd quantity between each phase region;
Mean discharge magnitude phase resolved plot, represents the mean discharge magnitude between each phase region;
Discharge time phase resolved plot, represents the discharge time between each phase region;
Electric discharge amplitude distribution collection of illustrative plates, the statistics of the discharge time of expression to different amplitudes;
Discharge energy distribution collection of illustrative plates, the statistics of the discharge energy of expression to different amplitudes;
Three-dimensional φ-Q-N collection of illustrative plates, reflects the relation between discharge capacity, discharge time and discharge phase all sidedly.
In a kind of XLPE cable partial discharge monitoring method application of the present invention, hardware device comprises some XLPE cable to be measured, some sensors, signal distributor box, capture card, industrial computer and expert system, some sensors are connected with some XLPE cable to be measured correspondingly, some sensors are connected with signal distributor box respectively, signal distributor box, capture card, industrial computer and expert system are connected successively, and signal distributor box is also connected with industrial computer.
Industrial computer operating system adopts Windows Server2003; Database on industrial computer adopts SQL Server2005; On industrial computer, configuration software adopts MATLAB R2007b (or MCR of corresponding version).
S5, in data analysis step, expert system has following feature:
1) system the most at last cable insulation state be divided into normal and note two ranks, and can, according to the data of current database and knowledge assessment cable insulation state, provide cable local discharge type and degree of confidence.Cable signal type is divided into: corona, internal discharge, creeping discharge, suspended discharge and noise;
2) system can be supported many circuits, and each circuit compared to analysis;
3) system is supported fuzzy knowledge and fuzzy reasoning, more tallies with the actual situation;
4) system is supported remote monitoring, and expert and user can be by the ruuning situations of long distance control system.In the time that there is something special, expert can assist to confirm failure condition by network remote
The major function of expert system has:
1) automatic analysis and fault diagnosis;
2) show the two and three dimensions characteristic spectrum that detects data recording;
3) historical trend of indicating characteristic parameter, and data back track function is provided;
4) possesses XLPE cable comparing function how to be measured;
5) possess detailed operation and diagnostic log.
In sum, XLPE cable partial discharge monitoring method of the present invention, by monitoring curent change on the ground wire of XLPE cable to be measured as differentiating the aging characteristic signal of cable insulation, can effectively monitor the state of insulation of XLPE cable, for online detection and the supervision of XLPE cable provide practicable method, help user to find as early as possible the potential insulation defect of cable, arrange ahead of time inspection and maintenance, thereby make powered operation safety, reliably, electrical equipment is safeguarded timely, reduce the loss, reduce production costs, can meet electric power and the industrial and mining enterprises testing requirement to cable insulation, provide in advance the deteriorated early warning information of cable, to prevent trouble before it happens, in advance defective cable is changed or processed, avoid the generation of pernicious ground connection and short trouble, accuracy is high.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, variation, modification to the above embodiment all will drop within the scope of claims of the present invention.
Claims (4)
1. an XLPE cable partial discharge monitoring method, is characterized in that, comprises the following steps:
S1, data collection steps, obtains the real-time voltage signal on the ground wire of corresponding XLPE cable to be measured by sensor;
S2, data aggregation step, described real-time voltage signal is aggregated into capture card by signal distributor box;
S3, data processing step, industrial computer is transferred described real-time voltage signal from described capture card, and described real-time voltage signal is carried out to filtering processing;
S4, data storing step, the described real-time voltage signal of processing is after filtering kept in database, history of forming voltage data;
S5, data analysis step, expert system is analyzed described historical voltage data, extracts characteristic parameter, forms characteristic spectrum.
2. a kind of XLPE cable partial discharge monitoring method according to claim 1, is characterized in that, described data processing step comprises the following steps:
S301, real-time voltage signal is transferred step, and described industrial computer is transferred described real-time voltage signal from described capture card;
S302, bandpass filtering treatment step, described industrial computer carries out bandpass filtering treatment to the described real-time voltage signal of transferring;
S303, FFT filtering treatment step, described industrial computer carries out the filtering processing of the Suppression of narrow band interference algorithm based on FFT to the described real-time voltage signal through bandpass filtering treatment;
S304, wavelet filtering treatment step, described industrial computer is to carrying out the filtering processing of the denoising algorithm based on small echo through the described real-time voltage signal of FFT filtering processing;
S305, NN filtering treatment step, described industrial computer is to carrying out the filtering processing of the filtering algorithm based on neural network through the described real-time voltage signal of wavelet filtering processing.
3. a kind of XLPE cable partial discharge monitoring method according to claim 1, it is characterized in that, described characteristic parameter in described data analysis step comprises threshold value, arrowband Partial discharge signal, maximum pd quantity, mean discharge magnitude, average discharge current, all square rate, NQN and discharge time, wherein:
Described threshold value, the lower limit of pulse amplitude is put in effective office;
Described arrowband Partial discharge signal, the peak value of data signal in certain narrowband frequency range is put in office;
Described maximum pd quantity, the maximal value that in single power frequency period, pulse amplitude is put in office;
Described mean discharge magnitude, the mean value of pulse amplitude is put in the interior office of single power frequency period;
Described average discharge current, flows through the average current of described sensor side resistance;
Described all square rates, the equal number formulary value that pulse amplitude is put in office;
Described NQN, i.e. standardized discharge time;
, in single power frequency period, there is the number of times discharging in described discharge time.
4. according to the arbitrary a kind of described XLPE cable partial discharge monitoring method of claim 1 or 3, it is characterized in that, described characteristic spectrum in described data analysis step comprises maximum pd quantity phase resolved plot, mean discharge magnitude phase resolved plot, discharge time phase resolved plot, electric discharge amplitude distribution collection of illustrative plates, discharge energy distribution collection of illustrative plates and three-dimensional φ-Q-N collection of illustrative plates, wherein:
Described maximum pd quantity phase resolved plot, represents the maximum pd quantity between each phase region;
Described mean discharge magnitude phase resolved plot, represents the mean discharge magnitude between each phase region;
Described discharge time phase resolved plot, represents the discharge time between each phase region;
Described electric discharge amplitude distribution collection of illustrative plates, the statistics of the discharge time of expression to different amplitudes;
Described discharge energy distribution collection of illustrative plates, the statistics of the discharge energy of expression to different amplitudes;
Described three-dimensional φ-Q-N collection of illustrative plates, reflects the relation between discharge capacity, discharge time and discharge phase all sidedly.
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| CN104375064A (en) * | 2014-11-07 | 2015-02-25 | 深圳供电局有限公司 | Partial discharge online monitoring alarm confidence coefficient analysis method and device |
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Application publication date: 20140702 |