CN105606975B - A kind of orientable superfrequency cable local discharge detection method and device - Google Patents
A kind of orientable superfrequency cable local discharge detection method and device Download PDFInfo
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- CN105606975B CN105606975B CN201610130910.0A CN201610130910A CN105606975B CN 105606975 B CN105606975 B CN 105606975B CN 201610130910 A CN201610130910 A CN 201610130910A CN 105606975 B CN105606975 B CN 105606975B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention discloses a kind of orientable superfrequency cable local discharge detection method and devices, it is characterised in that：Synchronous data sampling module includes two high speed acquisition channels and a low speed acquisition channel, external two extra-high video sensors and a power frequency component sensor are used for the following ultrahigh frequency partial discharge signals of synchronous acquisition 1GHz, environmental signal and power-frequency voltage signal, and extra-high video sensor is directly positioned on cable；Analysis and processing module effectively identifies cable local discharge signal and outside noise interference, further realizes partial discharge location by the collected synchrodata of 5-linked method comprehensive analysis；Power supply denoising module is used to prevent noise jamming from being introduced by portable power when outdoor use；There is user control terminal data acquisition display, interpretation of result, historical data to check and real time print report capability.The present invention can be detected and position to the shelf depreciation situation of power cable, improve the reliability of Partial Discharge Detection, accurate judgement shelf depreciation situation.
Description
Technical field
The present invention relates to electric system Partial Discharge Detection field more particularly to a kind of orientable superfrequency cable parts
Discharge detection method and device.
Background technology
In recent years, accounting of the high pressure XLPE power cables in urban electric power circuit is increasing, by attention degree also day
Cumulative height plays very important effect in ensureing city residents' energy consumption.It is introduced since the 80s and 90s in last century the country
The XLPE cable of 110kV voltage class, the partial cables being also currently running till now come into " midlife " of predetermined age,
Even there is quite a few high-tension cable to be in excess load operating status in spite of illness, there is cable body quality, attachment installation in addition
The problems such as laying quality and external force are destroyed, more so that this problem is further prominent, High Voltage XLPE Power Cable failure rate is also higher and higher.
Studies at home and abroad show that cable major insulation defect is the main reason for leading to cable fault, and detection method for local discharge is state
Detection cable insulation defect most effectual way is recognized in the technical field of border altogether.Experts and scholars and IEEE, IEC both domestic and external,
The more consistent recommendation partial discharge test of the internal authorities such as CIGRE organization is as being that cable and its attachment insulation status are evaluated
The best approach.Therefore, in order to avoid the frequent generation of cable fault, cable hidden danger is found before generation accident, effective part
Discharge examination is essential.
There are many method of cable local discharge detection, now at the scene also in the electrical on-line measurement method used mainly height
Frequency Partial Discharge Detection method.Traditional concept thinks, the primary bands of local discharge signal are in 100MHz hereinafter, therefore high-frequency detection
The groundwork frequency band of method has been completely suitable for the Partial Discharge Detection of XLPE cable, but a large amount of High Voltage XLPE Power Cables both at home and abroad
Partial discharge detection the result shows that, the detection result of high-frequency detection method is limited, with the increase of application range, has emerged increasingly
More shortcomings and deficiencies, easily generate erroneous judgement, and especially current criterion is mainly derived from U- Φ spectrograms, discharge capacity, time domain letter
Number, since parameter is few, faciostenosis is reacted, it is doubtful even more to be easy to cause result so that operation department has no way of doing it defect elimination.Early have
Studies have shown that the frequency of local discharge signal is up to upper GHz, superfrequency technology has obtained ripe application on GIS, but in electricity
Still using high frequency partial discharge detection technology as mainstream on cable.High frequency partial discharge detection equipment is limited in that, first, obtaining signal band
It is too low, for example, dividing low frequency (30kHz~300kHz), intermediate frequency (300kHz~3MHz), high frequency according to China's electromagnetic signal frequency range
(3MHz~30MHz), very high frequency(VHF) (30MHz~300MHz), superfrequency (300MHz~3GHz) etc., the shelf depreciation of the prior art
Detection device can only measure high frequency or very high frequency(VHF) following frequencies, cannot measure ultrahigh-frequency signal, therefore be lost the extra-high of preciousness
Frequency information.Second is that the method for discrimination to shelf depreciation is single, also it is to continue with and continues to use traditional discharge capacity-phase spectrogram or signal wave
Shape frequency spectrogram, third, can not be positioned to the local discharge signal measured, fourth, directly detection is not electric for measurement sensor
Cable ontology, but ground line signals are obtained, it is big to introduce noise jamming.Therefore, domestic and international mainstream high frequency partial discharge equipment is universal now
There are problems that the problem of operating status " being unable to explain clearly, road is unknown " to cable, the conclusion obtained also tends to be to allow operator headache
" doubtful electric discharge ", or be that of obtaining discharge signal, do not know it is derived from where but.
Since there are the above problems, in cable local discharge field, urgent need one kind can completely acquire part and put
Electric signal, accurate judgement superfrequency cable local discharge state and the method and apparatus with positioning function.
Invention content
In order to overcome existing cable local discharge detection device indeterminacy and cannot achieve cable local discharge positioning
Defect, the present invention provides a kind of orientable superfrequency cable local discharge detection method and devices, using superfrequency part
Discharge examination and independent multi-channel synchronous technology, sensor directly measure cable under test ontology or attachment, low frequency in accurate acquisition,
High frequency, very high frequency(VHF) and ultrahigh frequency partial discharge signal, obtain complete cable local discharge information, are effectively gone using double passage differential
It makes an uproar, feature confidence interval identifies that the real Partial discharge signal from cable, 5-linked fado parametric synthesis judge shelf depreciation situation simultaneously
Realize shelf depreciation defect positioning, to find that dangerous electric cable stoppage provides effective support in advance, it is ensured that power cable and its
The safe operation of attachment.
The present invention is using technical solution：
A kind of orientable superfrequency cable local discharge detection device, including：Sensor assembly, synchronous data sampling mould
Block, analysis and processing module, denoising power module and user control terminal；
Wherein, the sensor assembly includes two extra-high video sensors and a power frequency sensor, described two extra-high
Video sensor includes the first extra-high video sensor and the second extra-high video sensor, is the extra-high video sensor of same model parameter,
For obtaining cable local discharge signal；The power frequency sensor is for obtaining power frequency component；The synchronous data sampling module
Including two high speed acquisition channels and a low speed acquisition channel, external first superfrequency is distinguished in described two high speed acquisition channels
Sensor and the second extra-high video sensor；The low speed acquisition channel connects the power frequency component sensor；Synchronous data sampling
Module synchronization acquires local discharge signal, environmental signal and the power frequency component of superfrequency and following frequency range.
For the analysis and processing module by the collected synchrodata of " 5-linked method " comprehensive analysis, removal outside noise is dry
It disturbs, automatic identification cable local discharge signal, and realizes partial discharge location, store valid data；" the 5-linked method " analysis electric discharge
The parameter of amount-phase spectrogram, feature confidence interval, five electric discharge confidence level, periodic discharging probability and discharge capacity separate standards
Data.
The denoising power module includes portable power, and low pass power-supply filter, band shielded power supply line and anti-electromagnetism are dry
Disturb shielding case, for indoors or outdoor installation using when prevent the noise jamming introduced by portable power.
The user control terminal is checked and real time print report for data acquisition display, interpretation of result, historical data.
Further, the first extra-high video sensor in the extra-high video sensor is placed in cable body to be detected or its electricity
Outside cable fittings, two kinds of condenser type and electromagnetic type are divided into based on testing principle, the extra-high video sensor of electromagnetic type predominantly detects 30MHz
To 1.0GHz signals, it is adjacent to cable under test placement, the extra-high video sensor of condenser type can detect 1.5GHz following signals, and the present invention is excellent
It is to wind around on cable under test to select the extra-high video sensor of condenser type, setting, another identical extra-high video sensor
(the i.e. second extra-high video sensor), which is placed in the environment away from the sensor and cable under test preset distance, can synchronize detection environment
Interference signal, the preset distance are, for example, 2 meters；It can realize that the noise that removal environment introduces, power frequency pass using double passage differential
Sensor be then placed on on the first extra-high same phase cable under test of video sensor.
Further, the shielded enclosure for anti electromagnetic interference is made of heavy alloy net, is placed in 220V AC voltage output
Portable power outside, a power-supply filter is connected between local discharge detection device and portable power, and will be anti-electric
Magnetic disturbance Shielding Case grounding achievees the effect that remove power supply disturbance.
Further, two high speed acquisition channels can synchronous acquisition frequency in all signals of 1.5GHz or less, synchronization time essence
Degree is not more than 0.2ns.
Further, the 5-linked method that analysis and processing module uses includes discharge capacity-phase spectrogram, feature confidence interval, electric discharge
Five confidence level, periodic discharging probability and discharge capacity separate standards referred to as " 5-linked method " are used for qualitative and quantitative joint and judge electricity
Cable shelf depreciation and its severity；So-called electric discharge confidence level refers to removing noise data outside section by first step confidence interval
After noise data in second step binary channels comparison difference removal section, based on institute in big data Statistics analysis confidence interval
Residues is according to the possibility for being local discharge signal；The frequency and conduct that so-called periodic discharging probability mark local discharge signal occurs
One of the criterion of defect severity, the weight based on discharge signal in one discharge cycle of a large amount of analysiss of statistical data and pass
System.
Further, the first extra-high video sensor and the second superfrequency sensor distance 2m or more same root is placed in wait for
In detection cable, it is based on high accuracy data synchronous acquisition, it can be by short distance time difference method according to signal propagation direction and amplitude
It compares to realize the positioning of local discharge signal.
The present invention also proposes a kind of orientable superfrequency cable local discharge detection method, is filled using above-mentioned discharge examination
It sets and measures, specific steps include：
First extra-high video sensor is disposed close to cable position, the second extra-high video sensor is placed on around cable
A position in environment；The extra-high video sensors of measurement end signal FA and second that the first extra-high video sensor detects are acquired to detect
Environment end signal FB；It acquires power frequency sensor and obtains cable power frequency component SA；The measurement end signal FA and environment end signal
FB passes through low speed by synchronous data sampling mould high speed acquisition channel transfer in the block to analysis and processing module, the power frequency component
Acquisition channel is transferred to analysis and processing module；
For the analysis and processing module by the collected synchrodata of " 5-linked method " comprehensive analysis, removal outside noise is dry
It disturbs, comparison shelf depreciation realizes partial discharge location according to case automatic identification cable local discharge signal in expert database, stores
Valid data；" the 5-linked method " analyzes discharge capacity-phase spectrogram, feature confidence interval, electric discharge confidence level, periodic discharging probability
And the parametric data of five separate standards of discharge capacity；
Further, the method positioned to local discharge signal using above-mentioned apparatus is also proposed in the present invention, wrapped
Include following steps：
First extra-high video sensor and the second extra-high video sensor are placed on to the cable body of cable accessory one end simultaneously
On, it is spaced a predetermined distance, the cable local discharge signal that synchronous acquisition obtains utilizes short distance time difference method to analysis and processing module
Compare local discharge signal transmission time difference and amplitude size, local discharge signal is analyzed to obtain the propagation side of signal
To；
After completing previous step measurement, mobile first extra-high video sensor and the second extra-high video sensor are another to cable accessory
On the cable body at end, keep the relative position of the first extra-high video sensor and the second extra-high video sensor constant, it is same to be spaced
Preset distance, the cable local discharge signal that synchronous acquisition obtains analyze local discharge signal to analysis and processing module
Obtain the direction of propagation of signal；
If twice detection judgement the local discharge signal direction of propagation on the contrary, if detect signal be tested cable accessory generate
Signal successfully positions the cable accessory；
If the local discharge signal source direction of detection judgement twice is consistent, direction is directed toward the by the first extra-high video sensor
Two extra-high video sensors, or the first extra-high video sensor is directed toward by the second extra-high video sensor, then it is the direction to detect signal
The signal of this test point is traveled to, then continues detection positioning work along judgement direction, until signal source is found, and it is right
It is accurately positioned.
For the present invention using simple, sensor install convenient, sampling precision is high, can effectively acquire high frequency and following frequencies, very
High frequency, ultrahigh-frequency signal carry out analyzing processing to gathered data automatically using " 5-linked method " using expert database, are not necessarily to people
Accurate cable local discharge situation is can be obtained to carry out analysis to signal, there is powerful anti-interference ability and effective office
Put source positioning function.The present invention can effectively make up existing cable Partial Discharge Detecting Technology analysis result by artificial detection error
It is affected, test result is mostly uncertain doubtful result, can not have to local discharge signal source and noise signal source
The key technology blank that effect positioning etc. can not capture.
Description of the drawings
Fig. 1 is detection device system block diagram of the present invention.
Fig. 2 a are signal processing and analysis of the present invention and Partial Discharge Detection flow diagram.
Fig. 2 b are present invention positioning partial discharge position flow diagram.
Fig. 3 is Partial Discharge Sources positioning principle block diagram.
Fig. 4 is power supply denoising device connection figure in the present invention.
Fig. 5 is functional framework figure of the present invention.
Specific implementation mode
It elaborates below in conjunction with the accompanying drawings to the present invention.
Fig. 1 is the detection device system structure of the present invention, includes mainly sensor assembly, synchronous acquisition module, at analysis
Manage module, denoising power module and user control terminal.Wherein sensor assembly includes two extra-high video sensors and a work
Video sensor, power frequency sensor and an extra-high video sensor be placed on cable under test be used for obtain local discharge signal FA and
Power frequency component SA, the extra-high video sensor of another are placed in the air of measuring environment, for detecting environmental signal FB；It synchronizes and adopts
Collection module includes two high speed acquisition channels for being respectively intended to receive local discharge signal FA and environmental signal FB, and one is used for connecing
Receive the low speed acquisition channel and high-precise synchronization clock of power frequency component SA, can the extra-high video sensor of precise acquisition output letter
Number, triple channel synchronous error is not more than 0.2ns, is provided hardware support to realization positioning function；Analysis and processing module includes more
Core processor and mass storage, using the collected synchrodata of " 5-linked method " comprehensive analysis, binary channels synchronous difference is gone
Except extraneous noise jamming, using expert database automatic identification cable local discharge signal, and realizes the positioning in partial discharge source, will have
Effect data are stored into mass storage；Denoising power module includes portable power source system, low-pass filter denoising module,
Power module provides electric power support for the normal use of device, while being prevented by portable power source system when outdoor use device
The noise jamming of introducing；User control terminal module includes peripheral device interface and user control terminal, and display connection provides two
Kind interface, the personal PC remote accesses respectively based on RJ45 are connected with the display based on VGA, provide USB interface as outer
If interface channel, it can also be used to which the movable storage device of data exports, and data acquisition display, office may be implemented in user control terminal
Interpretation of result, partial discharge fault location are put, historical data is checked and account on the spot export function.
Fig. 2 (a) is general measure data analysis flow, the present invention measure field signal time and amplitude information first, tool
Body is：Acquisition measures end signal FA and environment end signal FB, while calculating the zero moment using power frequency synchronizing signal SA, completes letter
Number synchronization abstraction function.End signal FA and environment end signal FB processing are measured for collected on-site signal, it is right
It measures end signal FA and environment end signal FB and carries out time-domain and frequency-domain feature Fuzzy comparison difference, count discharge capacity and phase letter
Breath, can obtain initial data spectrogram.On the one hand, initial data spectrogram is further analyzed, on the other hand, initial data
Spectrogram is added to initial data spectrogram library as data information, is updated to initial data spectrogram library.According to pattern-recognition and
Neural network theory method analyzes the feature confidence interval of initial data spectrogram, and then obtains discharge capacity-phase spectrogram,
And further analyze discharge capacity, electric discharge confidence level, periodic discharging probability level parameter.Present invention concern discharge capacity-phase spectrogram,
Five feature confidence interval, electric discharge confidence level, periodic discharging probability and discharge capacity shelf depreciation independent parameters pass through each independent ginseng
The signal detected is identified in several analyses, judges whether it is that local discharge signal is simultaneously in cable by " 5-linked method "
Analysis leads to the severity of the defect of the shelf depreciation, provides rational maintenance and suggests.This is cable local discharge detection
Signal processing and analysis flow, major function is to accurately identify local discharge signal, after being found that local discharge signal, it is also necessary to
Sensor is relocated, the positioning of Partial Discharge Sources is carried out using partial discharge positioning method provided by the invention, such as Fig. 2 (b)
It is shown positioning analysis flow, after Fig. 2 (a) methods identify local discharge signal, two extra-high video sensors is placed on this and are asked
Topic cable accessory side is carried out at the same time measurement, what the extra-high video sensor of the extra-high video sensor in 1 position of synchronous acquisition and 2 positions obtained
Discharge information, local discharge signal is identified by " 5-linked method ", and amplitude and time difference information are carried out to two channel signal of moment
Extraction, judges the local discharge signal source direction using short distance time difference method.Further details are please continue to refer to Fig. 3.
Fig. 3 is the positioning principle schematic diagram of Partial Discharge Sources of the present invention.Fig. 3 shows one section of cable, is also associated with one thereon
Cable accessory (cable accessory and cable belong to two kinds of equipment, cable accessory refer in particular in cable length deficiency or cable with it is aerial
Line jointing used when connecting).It is measured twice for same cable attachment, passes through the synthesis of measurement result twice
Analysis judges that the local discharge signal detected derives from this cable accessory, or the left direction by the cable accessory or right side
Direction, which propagates to, measures position, the on-the-spot test implementation of this i.e. short distance time difference method.With specific reference to Fig. 3, wherein 1 is extra-high
Video sensor A, 2 be extra-high video sensor B identical with A, and 3 be signal processing apparatus, and superfrequency sensors A and B are put simultaneously
It sets on the cable body of cable accessory one end, is spaced L=2 meters, the cable local discharge signal that synchronous acquisition obtains, from export
Data in utilize short distance time difference method comparison signal transmission time difference and amplitude size, obtain the direction of propagation of signal.It completes
After previous step measures, superfrequency sensors A is placed on position 4, extra-high video sensor B is put by mobile apparatus of the present invention to position 6
It sets in position 5, same 2 meters of interval, the same cable local discharge signal that synchronous acquisition obtains is obtained from derived data
The direction of propagation of the signal at this time, if detection judgement signal source direction twice on the contrary, if to detect signal be tested cable accessory
The signal of generation can successfully position the cable accessory；If the signal source direction of detection judgement twice is consistent, direction is equal
Extra-high video sensor B is directed toward by superfrequency sensors A, then it is the signal that the direction travels to this test point to detect signal, can edge
Judgement direction continues detection positioning work, until finding signal source, and it is accurately positioned.
Fig. 4 is the structure of the denoising power module used in no standard alternating current, and 7 is are made of heavy alloy net in figure
Totally-enclosed shielded enclosure for anti electromagnetic interference, 8 be portable power, and 9 be low pass power filtering module, and 10 be band shielded power supply line,
11 be cable superfrequency local discharge detection device of the present invention, and portable power is placed in shielded enclosure for anti electromagnetic interference, is made
Portable power is connect with superfrequency partial discharge detection device by low pass power filtering module with band shielded power supply line, anti-electromagnetism
Interference shielding cover needs to be grounded, superfrequency local discharge detection device protective grounding, you can realizes power supply denoising effect.
Fig. 5 is functional framework of the present invention, and user can use the device of the invention to realize data acquisition display, partial discharge result
Analysis, partial discharge fault location, historical data are checked and account on the spot export function.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (6)
1. a kind of orientable superfrequency cable local discharge detection device, which is characterized in that including：Sensor assembly, data
Synchronous acquisition module, analysis and processing module, power module and user control terminal；
Wherein, the sensor assembly includes two extra-high video sensors and a power frequency sensor, described two extra-high to keep pouring in
Sensor includes the first extra-high video sensor and the second extra-high video sensor, is the extra-high video sensor of same model parameter, is used for
Cable local discharge signal is obtained, the power frequency sensor is for obtaining power frequency information；
The synchronous data sampling module includes two high speed acquisition channels and a low speed acquisition channel, for synchronous acquisition spy
The high frequency and local discharge signal of following frequency range, environmental signal and power frequency component, described two high speed acquisition channel difference are external
First extra-high video sensor and the second extra-high video sensor, the low speed acquisition channel connect the power frequency sensor；
The analysis and processing module is interfered by the collected synchrodata of " 5-linked method " comprehensive analysis, removal outside noise, from
Dynamic identification cable local discharge signal, and realize partial discharge location, store valid data；" the 5-linked method " analyzes discharge capacity-phase
Position spectrogram, feature confidence interval, electric discharge confidence level, the parametric data of five separate standards of periodic discharging probability and discharge capacity；
The power module includes portable power, low pass power-supply filter, band shielded power supply line and shielded enclosure for anti electromagnetic interference,
For indoors or outdoor installation using when prevent the noise jamming introduced by portable power；
The user control terminal is checked and real time print report for data acquisition display, interpretation of result, historical data；
The 5-linked method includes discharge capacity-phase spectrogram, feature confidence interval, electric discharge confidence level, periodic discharging probability and electric discharge
Five separate standards are measured, referred to as " 5-linked method ", is used for qualitative and quantitative joint and judges cable local discharge and its severity；Institute
Meaning electric discharge confidence level refers to removing noise data and second step binary channels outside section by first step confidence interval to compare difference
After noise data in section, based on big data Statistics analysis confidence interval in remaining data be local discharge signal can
It can property；The frequency that so-called periodic discharging probability mark local discharge signal occurs and one of the criterion as defect severity,
Weight and relationship based on discharge signal in one discharge cycle of a large amount of analysiss of statistical data.
2. a kind of orientable superfrequency cable local discharge detection device according to claim 1, which is characterized in that institute
It states the one of extra-high video sensor to be just placed at outside cable body to be detected or its cable accessory, setting is to wind around
On cable under test, another identical extra-high video sensor is placed in the environment away from 2 meters of the sensor and cable under test can be same
Step detection environmental disturbances signal can realize that the noise that removal environment introduces, power frequency sensor are then placed on using double passage differential
On same phase cable under test.
3. a kind of orientable superfrequency cable local discharge detection device according to claim 2, it is characterised in that：Institute
It states extra-high video sensor and selects condenser type or electromagnetic type.
4. a kind of orientable superfrequency cable local discharge detection device according to claim 1, it is characterised in that：Institute
It states shielded enclosure for anti electromagnetic interference to be made of heavy alloy net, be placed in outside the mobile power of 220V AC voltage output, office
A power-supply filter is connected between portion's discharging detection device and mobile power, and shielded enclosure for anti electromagnetic interference ground connection is reached
Except the effect of power supply disturbance.
5. a kind of orientable superfrequency cable local discharge detection method, utilizes discharging detection device described in claim 1
It measures, which is characterized in that specific steps include：First extra-high video sensor is disposed close to cable position, by second
Extra-high video sensor is placed on a position in cable ambient enviroment；Acquire the measurement end signal that the first extra-high video sensor detects
The environment end signal FB that the extra-high video sensors of FA and second detect；Acquisition power frequency sensor is for obtaining power frequency information SA；Institute
State measure end signal FA and environment end signal FB by synchronous data sampling mould high speed acquisition channel transfer in the block at analysis
Module is managed, the power frequency information is transferred to analysis and processing module by low speed acquisition channel；The analysis and processing module passes through " five
The collected synchrodata of connection method " comprehensive analysis, removal outside noise interference, comparison shelf depreciation is according to case in expert database
Automatic identification cable local discharge signal stores valid data；" the 5-linked method " analysis discharge capacity-phase spectrogram, feature are set
Believe section, electric discharge confidence level, the parametric data of five separate standards of periodic discharging probability and discharge capacity；The 5-linked method includes
Five discharge capacity-phase spectrogram, feature confidence interval, electric discharge confidence level, periodic discharging probability and discharge capacity separate standards, referred to as
" 5-linked method " is used for qualitative and quantitative joint and judges cable local discharge and its severity；So-called electric discharge confidence level refers to leading to
Noise data and second step binary channels comparison difference outside first step confidence interval removal section is crossed to remove in section after noise data,
Based on the possibility that remaining data in big data Statistics analysis confidence interval are local discharge signal；So-called periodic discharging is general
Rate indicates the frequency that local discharge signal occurs and one of the criterion as defect severity, is based on a large amount of analysiss of statistical data
The weight and relationship of discharge signal in one discharge cycle.
6. a kind of orientable superfrequency cable local discharge detection method according to claim 5, it is characterised in that：It is right
After in collected on-site signal, i.e. measurement end signal FA and environment end signal FB is acquired, to measuring end signal FA and environment
End signal FB carries out time-domain and frequency-domain feature Fuzzy and compares difference, counts discharge capacity and phase information, obtains initial data spectrogram；
On the one hand, initial data spectrogram is further analyzed, on the other hand, the initial data spectrogram is added as data information
To initial data spectrogram library, initial data spectrogram library is updated, according to pattern-recognition and neural network theory method to original
The feature confidence interval of beginning data spectrogram is analyzed, and then obtains discharge capacity-phase spectrogram, and further analyze discharge capacity,
Electric discharge confidence level, periodic discharging probability level parameter.
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