CN105093083B - Cable local discharge signal framing device and localization method - Google Patents
Cable local discharge signal framing device and localization method Download PDFInfo
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- CN105093083B CN105093083B CN201510552981.5A CN201510552981A CN105093083B CN 105093083 B CN105093083 B CN 105093083B CN 201510552981 A CN201510552981 A CN 201510552981A CN 105093083 B CN105093083 B CN 105093083B
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Abstract
The present invention provides a kind of cable local discharge signal framing device and localization method, positioner includes the signal pickup assembly and data processing equipment being connected with each other, data processing equipment is built-in with fpga chip, signal pickup assembly collection is inputted to the incidence wave and cable local discharge signal of cable, characteristic parameter corresponding to characteristic parameter corresponding to data processing equipment extraction incidence wave and cable local discharge signal, compare both characteristic parameters, when both characteristic parameter matchings, judge current cable local discharge signal for back wave corresponding to incidence wave, fpga chip calculates the time difference between incidence wave and back wave, and according to the time difference, fpga chip calculates the position of cable local discharge.Whole device, using the structure of simple and compact, the powerful disposal ability of fpga chip, the accurate, position of efficient detection cable local discharge.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to cable local discharge signal framing device and positioning
Method.
Background technology
With the high speed sustainable development of power system, the laying loop length of power cable steadily improves, in city
Extensive use is arrived.However, electric load is growing with voltage class, the Insulation Problems as caused by cable local defect are to supplying
Electricity quality and social economy etc. constitute great threat.In order to monitor the state of insulation of cable and find that it is locally lacked in time
Fall into, so as to prevent the generation of cable interruption of service, ensure the reliability of operation of power networks, it is necessary to which cable local defect is examined
Survey.
Main forms of the cable local discharge as cable run insulation fault early stage, by experts and scholars both domestic and external
And the optimal experiment for evaluating cable insulation state that the International Power such as IEEE, IEC, CIGRE authoritative institution tissue is unanimously recommended
Index.Therefore, the local defect of cable can effectively be judged by cable local discharge signal being monitored.
However, currently for cable local discharge signal detection means based on computer, mostly it is bulky, detection
It is less efficient, and cost is higher, is difficult to widely the local defect of cable quickly check and position in practice.
The content of the invention
Based on this, it is necessary to for existing cable local discharge signal positioner detection efficiency it is low, baroque ask
Topic, there is provided a kind of detection efficiency high and simple in construction cable local discharge signal framing device and localization method.
A kind of cable local discharge signal framing device, including the signal pickup assembly of interconnection and data processing dress
Put, wherein, the data processing equipment is built-in with FPGA, and (Field Programmable Gate Array, field-programmable are patrolled
Collect gate array) chip；
Signal pickup assembly collection input to cable incidence wave and cable local discharge signal, at the data
Manage device and extract characteristic parameter corresponding to characteristic parameter corresponding to the incidence wave and the cable local discharge signal, comparison institute
Characteristic parameter corresponding to characteristic parameter corresponding to incidence wave and the cable local discharge signal is stated, when corresponding to the incidence wave
When characteristic parameter characteristic parameter corresponding with the cable local discharge signal matches, presently described cable local discharge letter is judged
Number it is back wave corresponding to the incidence wave, the fpga chip calculates incidence wave back wave corresponding with the incidence wave
Between time difference, and according to the time difference, the fpga chip calculates the position of cable local discharge.
A kind of cable local discharge signal framing method, including step：
Incidence wave is applied to cable, gathers cable local discharge signal；
Extract characteristic parameter corresponding to characteristic parameter corresponding to the incidence wave and the cable local discharge signal；
Compare characteristic parameter corresponding to characteristic parameter corresponding to the incidence wave and the cable local discharge signal, when than
When being matched to characteristic parameter corresponding to characteristic parameter corresponding to the incidence wave and the cable local discharge signal, judge current
The cable local discharge signal is back wave corresponding to the incidence wave；
Fpga chip calculates the time difference between incidence wave back wave corresponding with the incidence wave；
According to the time difference, the fpga chip calculates the position of cable local discharge.
Cable local discharge signal framing device of the present invention, including the signal pickup assembly of interconnection and data processing dress
Put, data processing equipment is built-in with fpga chip, and signal pickup assembly collection input to the incidence wave and cable of cable is locally put
Electric signal, characteristic parameter corresponding to characteristic parameter corresponding to data processing equipment extraction incidence wave and cable local discharge signal,
Both characteristic parameters are compared, when both characteristic parameter matchings, it is incidence wave pair to judge current cable local discharge signal
The back wave answered, fpga chip calculates the time difference between incidence wave and back wave, and calculates electricity according to time difference, fpga chip
The position of cable shelf depreciation.Whole device, using the structure of simple and compact, the powerful disposal ability of fpga chip is accurate, efficient
The position of detection cable shelf depreciation.
In addition, the present invention also provides a kind of cable local discharge signal framing method, apply incidence wave, collection electricity to cable
Cable local discharge signal, extract characteristic parameter corresponding to characteristic parameter corresponding to incidence wave and cable local discharge signal, comparison
Both characteristic parameters, when both characteristic parameter matchings, judge current cable local discharge signal for corresponding to incidence wave
Back wave, fpga chip calculate the time difference between incidence wave and back wave, and according to the time difference, it is local that fpga chip calculates cable
The position of electric discharge, process of haveing suffered use simple step, the powerful disposal ability of fpga chip, accurate, efficient detection cable office
The position of portion's electric discharge.
Brief description of the drawings
Fig. 1 is the structural representation of cable local discharge signal framing device one embodiment of the present invention；
Fig. 2 is the structural representation of second embodiment of cable local discharge signal framing device of the present invention；
Fig. 3 is the schematic flow sheet of cable local discharge signal framing method one embodiment of the present invention；
Fig. 4 is the schematic flow sheet of second embodiment of cable local discharge signal framing method of the present invention.
Embodiment
As shown in figure 1, a kind of cable local discharge signal framing device, include the signal pickup assembly 100 of interconnection
With data processing equipment 200, wherein, data processing equipment 200 is built-in with fpga chip；
The collection of signal pickup assembly 100 is inputted to the incidence wave and cable local discharge signal of cable, data processing equipment
Characteristic parameter corresponding to characteristic parameter corresponding to 200 extraction incidence waves and cable local discharge signal, is compared corresponding to incidence wave
Characteristic parameter corresponding to characteristic parameter and cable local discharge signal, when characteristic parameter corresponding to incidence wave and cable local discharge
When characteristic parameter corresponding to signal matches, current cable local discharge signal is judged for back wave corresponding to incidence wave, FPGA cores
Piece calculates the time difference between incidence wave back wave corresponding with incidence wave, and calculates cable office according to time difference, fpga chip
The position of portion's electric discharge.
Apply incidence wave to cable, cable is by (fracture or minor insulation decline beyond critical in the position of failure
The position of value) partial discharge phenomenon occurs, cable local discharge phenomenon can produce corresponding back wave, can be by monitoring cable
Incidence wave and caused back wave accurately calculate the position of cable local discharge.Specifically, incidence wave is preferably high-tension pulse
Rush signal.
During work, apply incidence wave (high-voltage pulse signal) to cable, cable and partial discharge phenomenon occur in abort situation,
Cable local discharge signal is generated, the collection of signal pickup assembly 100 applies to the incidence wave and cable of cable and shelf depreciation occurs
The cable local discharge signal of phenomenon generation, data storage that signal pickup assembly 100 collects these are simultaneously exported to data
Processing unit 200, data processing equipment 200 carry out characteristic parameter extraction to incidence wave and cable local discharge signal, compare into
The characteristic parameter of ejected wave and the characteristic parameter of cable local discharge signal, when such a match occurs, that is, judge that current cable is locally put
Electric signal is back wave corresponding to incidence wave, and FPGA calculates the time difference of incidence wave and back wave, specifically, be incidence wave and
Back wave reaches the time difference of detection port, fpga chip, according to the position of time difference calculating cable local discharge.Preferably,
The position of cable local discharge can be calculated using traveling wave method and peak value matching method according to the time difference.
Cable local discharge signal framing device of the present invention, including at the signal pickup assembly 100 and data of interconnection
Device 200 is managed, data processing equipment 200 is built-in with fpga chip, the incidence wave of the collection of signal pickup assembly 100 input to cable
With cable local discharge signal, data processing equipment 200 extracts characteristic parameter and cable local discharge signal corresponding to incidence wave
Corresponding characteristic parameter, both characteristic parameters are compared, when both characteristic parameter matchings, judge current cable local discharge
Signal is back wave corresponding to incidence wave, and fpga chip calculates the time difference between incidence wave and back wave, and according to the time difference,
Fpga chip calculates the position of cable local discharge.Whole device, using the structure of simple and compact, the powerful processing of fpga chip
Ability, the accurate, position of efficient detection cable local discharge.
As shown in Fig. 2 in one of the embodiments, signal pickup assembly 100 includes the He of probe 120 of mutual connection
Data collecting card 140, data collecting card 140 are connected with data processing equipment 200.
Probe 120 is used to sensing, gathering signal, and data collecting card 140 is used for signal collection, the remittance that will be sensed, collect
Total and storage backup.In practical operation, probe 120 disclosure satisfy that 10kV and above oscillating wave voltage and office
The measurement of portion's discharge signal, the sample rate of data collecting card 140 are 100MHz, can ensure the complete of local discharge signal feature
Property.
As shown in Fig. 2 in one of the embodiments, cable local discharge signal framing device also includes Signal Pretreatment
Device 300, signal pickup assembly 100 are connected by signal conditioner 300 with data processing equipment 200, and the signal is pre-
Processing unit is built-in with another fpga chip；
Signal conditioner 300 is used for using FFT (Fast Fourier Transformation, fast Fourier change
Change) filtering and Algorithms of Wavelet Analysis, elimination noise processed is carried out to cable local discharge signal.Signal conditioner can within
Another fpga chip is put, signal is pre-processed using calculation processing power powerful FPGA.
Cable local discharge signal may be mingled with partial noise signal in practical operation, and these noise signals can be serious
Positioning precision is influenceed, therefore, setting up signal conditioner 300 herein, elimination noise is carried out to cable local discharge signal
Processing, improve the positional accuracy of whole cable local discharge signal framing device.Preferably, signal conditioner 300 is adopted
With FFT filtering elimination noise processed is carried out with Algorithms of Wavelet Analysis.
As shown in Fig. 2 in one of the embodiments, cable local discharge signal framing device also includes input through keyboard
Device 400, finger-impu system 400 are connected with signal pickup assembly 100.
Finger-impu system 400 is used to input certain operations instruction or data, is worked with control signal harvester 100
State and sampling period.Such as work or resting state can be entered with control signal harvester 100.
As shown in Fig. 2 in one of the embodiments, cable local discharge signal framing device also includes display device
500, display device 500 is connected with data processing equipment 200.
In one of the embodiments, display device 500 is charactron.
Display device 500 is used for the result of calculation of display data processing apparatus 200, that is, shows the position of cable local discharge
Put, be easy to that user is directly perceived, convenient goes and finds out what's going on.
In one of the embodiments, cable local discharge signal framing device also includes resetting means, resetting means with
Data processing equipment 200 connects.
Resetting means can send control instruction and clear data what is stored in processing unit 200 and signal pickup assembly 100
Historical data, so that data processing equipment 200 and signal pickup assembly 100 reset, cable local discharge signal so of the present invention
Positioner detection will not be disturbed when detecting different cables by historical data.
In addition, as shown in figure 3, the present invention also provides a kind of cable local discharge signal framing method, including step：
S100：Incidence wave is applied to cable, gathers cable local discharge signal；
S200：Extract characteristic parameter corresponding to characteristic parameter corresponding to incidence wave and cable local discharge signal；
S300：Characteristic parameter corresponding to comparing characteristic parameter corresponding to incidence wave and cable local discharge signal, works as comparison
When characteristic parameter corresponding to characteristic parameter corresponding to incidence wave and cable local discharge signal matches, judge that current cable is locally put
Electric signal is back wave corresponding to incidence wave；
S400：Fpga chip calculates the time difference between incidence wave back wave corresponding with incidence wave；
S500：According to the time difference, fpga chip calculates the position of cable local discharge.
The present invention also provides a kind of cable local discharge signal framing method, applies incidence wave, collection cable office to cable
Portion's discharge signal, extract both characteristic parameters, comparison corresponding to characteristic parameter corresponding to incidence wave and cable local discharge signal
Characteristic parameter, when both characteristic parameter matching when, judge current cable local discharge signal for corresponding to incidence wave reflection
Ripple, fpga chip calculate the time difference between incidence wave and back wave, and according to the time difference, fpga chip calculates cable local discharge
Position, process of haveing suffered uses simple step, and the powerful disposal ability of fpga chip, accurate, efficient detection cable is locally put
The position of electricity.
In one of the embodiments, according to the time difference, the position that fpga chip calculates cable local discharge is specially：
Using traveling wave method and peak value matching method, according to the time difference, fpga chip calculates the position of cable local discharge.
As shown in figure 4, in one of the embodiments, there is step after step S500：
S600：Obtain the position that the multiple different sampling instants of same cable calculate the cable local discharge obtained；
S700：Calculate being averaged for the position for the cable local discharge that the multiple different sampling instants calculating of same cable obtain
Value, obtain the position mean of cable local discharge；
S800：Show the position mean of cable local discharge.
Position mean and the display of cable local discharge are finally obtained using mean value calculation, it is possible to reduce data processing
During abnormal data result of calculation is influenceed, improve the degree of accuracy of positioning.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. cable local discharge signal framing device, it is characterised in that the signal pickup assembly sum including interconnection According to processing unit, wherein, the data processing equipment is built-in with fpga chip；The signal pickup assembly collection is inputted to the incidence wave and cable local discharge signal of cable, the data processing equipment Characteristic parameter corresponding to extracting characteristic parameter corresponding to the incidence wave and the cable local discharge signal, compares the incidence Characteristic parameter corresponding to characteristic parameter corresponding to ripple and the cable local discharge signal, when feature corresponding to the incidence wave is joined When number characteristic parameter corresponding with the cable local discharge signal matches, judge presently described cable local discharge signal for institute Back wave corresponding to incidence wave is stated, the fpga chip is calculated between incidence wave back wave corresponding with the incidence wave Time difference, and the position of cable local discharge is calculated according to the time difference, the fpga chip, the incidence wave is high-tension pulse Rush signal.
- 2. cable local discharge signal framing device according to claim 1, it is characterised in that the signal pickup assembly Probe and data collecting card including mutual connection, the data collecting card are connected with the data processing equipment.
- 3. cable local discharge signal framing device according to claim 1 or 2, it is characterised in that also pre- including signal Processing unit, the signal pickup assembly are connected by the signal conditioner with the data processing equipment, the letter Number pretreatment unit is built-in with another fpga chip；The signal conditioner is used to, using FFT filtering and Algorithms of Wavelet Analysis, enter the cable local discharge signal Row eliminates noise processed.
- 4. cable local discharge signal framing device according to claim 1 or 2, it is characterised in that also defeated including keyboard Enter device, the finger-impu system is connected with the signal pickup assembly.
- 5. cable local discharge signal framing device according to claim 1 or 2, it is characterised in that also include display dress Put, the display device is connected with the data processing equipment.
- 6. cable local discharge signal framing device according to claim 5, it is characterised in that the display device is number Code pipe.
- 7. cable local discharge signal framing device according to claim 1 or 2, it is characterised in that also include resetting dress Put, the resetting means is connected with the data processing equipment.
- A kind of 8. cable local discharge signal framing method, it is characterised in that including step：Incidence wave is applied to cable, gathers cable local discharge signal, the incidence wave is high-voltage pulse signal；Extract characteristic parameter corresponding to characteristic parameter corresponding to the incidence wave and the cable local discharge signal；Characteristic parameter corresponding to characteristic parameter corresponding to the incidence wave and the cable local discharge signal is compared, when comparison institute When stating characteristic parameter matching corresponding to characteristic parameter corresponding to incidence wave and the cable local discharge signal, judge presently described Cable local discharge signal is back wave corresponding to the incidence wave；Fpga chip calculates the time difference between incidence wave back wave corresponding with the incidence wave；According to the time difference, the fpga chip calculates the position of cable local discharge.
- 9. cable local discharge signal framing method according to claim 8, it is characterised in that described according to the time Difference, the position that the fpga chip calculates cable local discharge are specially：Using traveling wave method and peak value matching method, according to the time difference, the fpga chip calculates the position of cable local discharge.
- 10. cable local discharge signal framing method according to claim 8 or claim 9, it is characterised in that described in the basis Time difference, the fpga chip also have step after calculating the position of cable local discharge：Obtain the position that the multiple different sampling instants of same cable calculate the cable local discharge obtained；The average value that the multiple different sampling instants of same cable calculate the position of the cable local discharge obtained is calculated, obtains cable The position mean of shelf depreciation；Show the position mean of the cable local discharge.
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| CN201510552981.5A CN105093083B (en) | 2015-08-31 | 2015-08-31 | Cable local discharge signal framing device and localization method |
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| NL2005431C2 (en) * | 2010-10-01 | 2012-04-03 | Locamation B V | Method and system for on-line measurement in power cables. |
| CN102288883B (en) * | 2011-08-30 | 2014-04-02 | 华南理工大学 | Oscillation wave partial discharge identifying and positioning method for asynchronous double-end power cable |
| WO2013048173A2 (en) * | 2011-09-28 | 2013-04-04 | 한국전력공사 | Apparatus for removing partial discharge noise and method for diagnosing partial discharge |
| CN102435924B (en) * | 2011-10-31 | 2014-08-13 | 广东电网公司广州供电局 | Automatic positioning method and system for cable local discharge single end of OWTS (Oscillating Wave Test System) detection device |
| CN102565634B (en) * | 2012-01-10 | 2014-04-02 | 广东电网公司电力科学研究院 | Power cable fault location method based on transfer function method |
| CN103472376B (en) * | 2013-09-11 | 2016-03-02 | 国家电网公司 | Partial discharge of transformer superfrequency positioning analysis device and method for positioning analyzing thereof |
| CN103513167B (en) * | 2013-09-18 | 2016-03-30 | 北京四方继保自动化股份有限公司 | Based on the switch partial discharge state monitoring apparatus of Board of Distributed Network Constructed |
| CN103823168B (en) * | 2014-03-10 | 2016-06-22 | 中国科学院电子学研究所 | Testing circuit and device to gas-insulated gas insulated metal enclosed swit chgear shelf depreciation |
| CN104730424B (en) * | 2015-03-02 | 2018-07-17 | 国家电网公司 | Cable local discharge localization method based on auto-correlation-Wavelet Modulus Maxima analysis |
| CN205067668U (en) * | 2015-08-31 | 2016-03-02 | 广州供电局有限公司 | Cable partial discharge signal positioning device |
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