CN109031073A - cable local discharge positioning device and method - Google Patents
cable local discharge positioning device and method Download PDFInfo
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- CN109031073A CN109031073A CN201811026185.8A CN201811026185A CN109031073A CN 109031073 A CN109031073 A CN 109031073A CN 201811026185 A CN201811026185 A CN 201811026185A CN 109031073 A CN109031073 A CN 109031073A
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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
Abstract
The present invention relates to cable local discharge positioning device and methods.A kind of cable local discharge positioning device is provided, which includes: clock-pulse generator, two sensors and two signal pickers.Clock-pulse generator is connected to one end of tested cable, for generating synchronization pulse.Two sensors are connected to the both ends of tested cable, are used for sensing signal, the signal sensed includes synchronization pulse and local discharge signal.Clock-pulse generator is connect with the sensor for the same side for being located at tested cable.Two signal pickers connect one to one with two sensors, to acquire and handle the signal that corresponding sensor senses.Above-mentioned cable local discharge positioning device, structure is simple, accuracy is higher, convenient to use, can be unsatisfactory for or GPS interferes biggish certain particular applications to be accurately located shelf depreciation due to communication condition.Present invention also provides a kind of cable local discharge localization methods.
Description
Technical field
The present invention relates to cable local discharge positioning fields, relate more specifically to cable local discharge positioning device and side
Method.
Background technique
With the continuous quickening of urbanization process, power cable is just being increasingly subject to people's as most important transmission of electricity tool
Concern and attention, wherein the research also attention by more and more researchers to power cable shelf depreciation.
Have much to the localization method of power cable shelf depreciation at present, wherein the method for comparing mainstream is fixed using traveling wave
Position mainly includes two methods of single-ended and both-end, the former foundation is the transient state travelling wave that generates when partial discharge occurs along cable to two
It holds and propagates, refraction and reflection occur when encountering different medium, determine discharge position place using the time difference of back wave；The latter
The time difference of progress both ends synchronous acquisition is transmitted to be positioned to both ends using traveling wave.Due to single-ended reflection propagation path
It is longer, in addition pulse signal decaying can position in practical applications than more serious by the influence of transition impedance when point of discharge
Error it is larger.In comparison, then not by above-mentioned interference, mainly the accurate time is arranged at cut cable both ends in it for both-end positioning
Synchronizing device synchronizes, and is then positioned according to the waveform that both ends acquire, positioning accuracy depends primarily on synchronization
Time error.
At present usually using PTP (Precision Time Protocol, Precision Time Protocol) network clock synchronization it is synchronous or
GPS (global positioning system) pulse per second (PPS) is synchronous, but in certain particular applications, since communication condition is unsatisfactory for or GPS is dry
It disturbs larger, cannot achieve both methods of synchronization.
Summary of the invention
It is synchronous with GPS and lead to that asking for shelf depreciation cannot be positioned for cannot achieve PTP in certain particular applications
Topic, it is necessary to which a kind of cable local discharge positioning device and method based on impulsive synchronization is provided.
According to the first aspect of the invention, a kind of cable local discharge positioning device is provided, which includes: synchronous arteries and veins
Rushing generator, two sensors and two signal pickers, wherein clock-pulse generator is connected to one end of tested cable,
For generating synchronization pulse；Two sensors are connected to the both ends of tested cable, are used for sensing signal, are sensed
Signal includes synchronization pulse and local discharge signal, the sensing of clock-pulse generator and the same side for being located at tested cable
Device connection；Two signal pickers connect one to one with two sensors, acquire and handle what corresponding sensor sensed
Signal is tested the position of shelf depreciation on cable to determine.
Above-mentioned cable local discharge positioning device, including clock-pulse generator, two sensors and two signal acquisitions
Device, by synchronous two signal pickers of clock-pulse generator, two signal pickers acquire and handle respective sensor sense
The signal of survey, to determine the position of tested cable local discharge according to treated signal.Above-mentioned cable local discharge positioning
Device, structure is simple, accuracy is higher, convenient to use, can due to communication condition be unsatisfactory for or GPS interference it is biggish certain
A little particular applications are accurately located shelf depreciation.
Signal picker includes: the first filter unit in one of the embodiments, for carrying out to collected signal
Filtering, to obtain the signal after preliminary noise reduction；Analog-digital converter is connect with the first filter unit, to the letter after preliminary noise reduction
Number carry out analog-to-digital conversion；Second filter unit, connect with analog-digital converter, to be filtered to the signal after analog-to-digital conversion, with
Signal after obtaining further noise reduction；Lock-out pulse matching unit is connect with the second filter unit, and being used for will be after further noise reduction
Signal matched with synchronization pulse, whether be synchronization pulse with the collected signal of determination；And storage is single
Member is connect with lock-out pulse matching unit, to store collected local discharge signal.
Two signal picker communication connections in one of the embodiments, and one in two signal pickers
It include processor in signal picker, processor is used to collect the time difference of synchronization pulse according to two signal pickers
The partial discharge position on tested cable is determined with the time difference for collecting same local discharge signal.
Whether processor is also used to judge effective through determining partial discharge position in one of the embodiments,.
Clock-pulse generator generates pulsewidth and the adjustable step pulse signal of amplitude in one of the embodiments,.
According to the second aspect of the invention, a kind of cable local discharge localization method is provided, this method comprises: obtaining two
A collected signal of signal picker；Synchronization pulse and local discharge signal in identification signal；According to two signals
The time difference that collector collects local discharge signal determines on tested cable with the time difference for collecting synchronization pulse
Partial discharge position；Judge it is whether effective through determining partial discharge position, if effectively, being determined according to partial discharge position
Position.
Above-mentioned cable local discharge localization method, above-mentioned cable local discharge localization method obtain described two signals and adopt
The collected signal of storage and the time difference arteries and veins synchronous with collecting for collecting local discharge signal according to two signal pickers
The time difference for rushing signal determines partial discharge position on tested cable, in addition, also judge be through determining partial discharge position
It is no effective, thus can simply accurately determine the position of shelf depreciation on cable.
Synchronization pulse and local discharge signal in identification signal in one of the embodiments, comprising: to acquisition
Signal carry out hardware filtering, to obtain the signal after preliminary noise reduction；Analog-to-digital conversion is carried out to the signal after preliminary noise reduction, with
Signal after to analog-to-digital conversion；Software filtering is carried out to the signal after analog-to-digital conversion, to obtain the signal after further noise reduction；Know
The synchronization pulse and local discharge signal in signal after other noise reduction；And the local discharge signal that storage identifies.
Time difference and the acquisition of local discharge signal are collected according to two signal pickers in one of the embodiments,
Time difference to synchronization pulse determines the partial discharge position on tested cable, comprising: is adopted according to two signal pickers
The time difference for collecting local discharge signal and the time difference for collecting synchronization pulse determine whether partial discharge position belongs to
Tested cable；When determining that partial discharge position belongs to tested cable, shelf depreciation letter is collected according to two signal pickers
Number time difference and collect time difference of synchronization pulse and determine partial discharge position on tested cable.
Time difference and the acquisition of local discharge signal are collected according to two signal pickers in one of the embodiments,
Time difference to synchronization pulse determines whether partial discharge position belongs to tested cable, comprising: judges two signal acquisitions
Whether the time difference that device collects synchronization pulse is greater than the time difference for collecting local discharge signal, if so, part is put
Electric position belongs to tested cable.
Judge in one of the embodiments, whether effective through determining partial discharge position, comprising: adopt two signals
The collected local discharge signal of storage is compared, and determines the similar of two collected local discharge signals of signal picker
Degree；Judge whether similarity is greater than preset similarity threshold, if so, judging two signal acquisitions according to partial discharge position
Whether the collected local discharge signal of device meets attenuation law, if so, determining that partial discharge position is effective.
Detailed description of the invention
The preferred rather than embodiment of limitation of the invention will be described with reference to attached drawing by way of example, in which:
Fig. 1 shows the schematic diagram of the cable local discharge positioning device according to one embodiment of the application.
Fig. 2 shows the signals according to signal picker in the cable local discharge positioning device of one embodiment of the application
Figure.
Fig. 3, which is shown, acquires synchronization pulse and shelf depreciation according to two signal pickers of one embodiment of the application
The schematic diagram of the time difference of signal.
Fig. 4 shows the flow chart of the cable local discharge localization method according to one embodiment of the application.
Fig. 5 shows the flow chart of the step S300 of cable local discharge localization method shown in Fig. 4.
Fig. 6 shows the flow chart of the step S400 of cable local discharge localization method shown in Fig. 4.
Fig. 7 shows the flow chart of the sub-step S410 of step S400 shown in fig. 6.
Fig. 8 shows the flow chart of the step S500 of cable local discharge localization method shown in Fig. 4.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Each technical characteristic of above embodiments can carry out arbitrary group
It closes, for simplicity of description, combination not all possible to each technical characteristic in above-described embodiment is all described, however,
As long as there is no contradiction in the combination of these technical features, all should be considered as described in this specification.
This application provides a kind of cable local discharge positioning devices, as shown in Figure 1, the device includes: lock-out pulse hair
Raw 120, two sensors 140 of device and two signal pickers 160.Clock-pulse generator 120 is connected to the one of tested cable
End, for generating synchronization pulse.Two sensors 140 are connected to the both ends of tested cable, are used for sensing signal.Two
The signal that a sensor 140 is sensed includes synchronization pulse and local discharge signal.Local discharge signal includes tested electricity
Local discharge signal in cable further includes the local discharge signal outside cable.Clock-pulse generator 120 be located at tested cable
Same side sensor 140 connect.Two signal pickers 160 connect one to one with two sensors 140, to acquire simultaneously
Handle the signal that corresponding sensor 140 senses.It is same when two signal pickers 160 collect synchronization pulse
Step.
Above-mentioned cable local discharge positioning device, including clock-pulse generator, two sensors and two signal acquisitions
Device, by synchronous two signal pickers of clock-pulse generator, two signal pickers acquire and handle respective sensor sense
The signal of survey, to determine the position of tested cable local discharge according to treated signal.Above-mentioned cable local discharge positioning
Device, structure is simple, accuracy is higher, convenient to use, can due to communication condition be unsatisfactory for or GPS interference it is biggish certain
A little particular applications are accurately located shelf depreciation.
In one embodiment, clock-pulse generator generates pulsewidth and the adjustable step pulse signal of amplitude.It can root
Pulsewidth and the amplitude of pulse signal are adjusted according to actual conditions and demand to improve the accurate positioning of cable local discharge positioning device
Property.
In one embodiment, as shown in Fig. 2, showing the signal of the signal picker in an embodiment according to the present invention
Figure, signal picker 160 include:
First filter unit 161, for being filtered to collected signal, to obtain the signal after preliminary noise reduction.
Specifically, the first filter unit 161 is filtered collected signal, tentatively to filter out the noise in signal.
For example, the first filter unit 161 can filter out the noise of a certain frequency range.
Analog-digital converter 162 is connect with the first filter unit 161, to carry out analog-to-digital conversion to the signal after preliminary noise reduction.
Specifically, analog-digital converter 162 carries out analog-to-digital conversion to the signal after preliminary noise reduction, after obtaining analog-to-digital conversion
Signal.
Second filter unit 163, connect with analog-digital converter 162, to be filtered to the signal after analog-to-digital conversion, with
Signal to after further noise reduction.
Specifically, the second filter unit 163 further filters the signal after analog-to-digital conversion, to obtain further
Signal after noise reduction.
Lock-out pulse matching unit 164 is connect with the second filter unit, for by after further noise reduction signal with it is known
Synchronization pulse matched, whether be synchronization pulse with the collected signal of determination.
Specifically, the synchronization pulse for identification of lock-out pulse matching unit 164, when two signal pickers all receive
When synchronization pulse, start to acquire local discharge signal.
Storage unit 165 is connect with lock-out pulse matching unit, to store collected local discharge signal.
Specifically, storage unit 165 is for storing collected local discharge signal.It is communicated to connect with storage unit 165
Host computer can read local discharge signal from storage unit and be analyzed, with for example determine shelf depreciation early warning grade
Not.
Above-mentioned cable local discharge positioning device, signal picker can to collected signal carry out hardware filtering,
Analog-to-digital conversion and software filtering provide more reliable basis to realize the noise reduction of signal for subsequent positioning, meanwhile, signal is adopted
Storage identifies synchronization pulse, starts to acquire local discharge signal after synchronization, and collected local discharge signal is deposited
It stores up in the memory unit, for further analyzing and handling.
In one embodiment, two signal picker communication connections, and a signal in two signal pickers
It include processor in collector, processor is used to collect the time difference of synchronization pulse according to two signal pickers and adopts
The time difference for collecting same local discharge signal determines the partial discharge position being tested on cable.
Specifically, after two signal pickers receive lock-out pulse, start to acquire local discharge signal.Two signal acquisitions
The device recordable time for collecting signal, signal includes synchronization pulse and local discharge signal.Partial discharge position needs
The time difference of synchronization pulse is collected according to two signal pickers and collects the time of same local discharge signal
Difference determines.Therefore, it is necessary to processors to collect time difference and the acquisition of synchronization pulse according to two signal pickers
Partial discharge position is determined to the time difference of same local discharge signal.Processor may include in two signal pickers
One in, and two signal pickers be communication connection.Processor obtains two signal pickers and collects synchronous arteries and veins
It rushes the time difference of signal and collects the time difference of same local discharge signal, and determined and be tested according to two time differences of acquisition
The position of shelf depreciation on cable.Same local discharge signal refers to the office that same partial discharge position issues from tested cable
Portion's discharge signal.
Above-mentioned cable local discharge positioning device determines the position of shelf depreciation by the processor in a signal picker
It sets, so that the structure of shelf depreciation positioning device is simple and easy to operate.It in other embodiments, can also be by being separately provided
Processor determine partial discharge position, and the processor communicates to connect with two signal pickers respectively, can be from two
Obtained in a signal picker the two signal pickers collect synchronization pulse and local discharge signal time or
Time difference.
In one embodiment, whether processor is also used to judge effective through the determining partial discharge position.
Specifically, multiple position shelf depreciations, therefore two collected offices of signal picker may be had by being tested on cable
Portion's discharge signal may belong to the local discharge signal of same position sending, it is also possible to belong to the shelf depreciation of different location sending
Signal, if two collected local discharge signals of signal picker belong to same partial discharge position, two signals are adopted
The collected local discharge signal of storage belongs to same local discharge signal, thus effective through determining partial discharge position, no
It is then invalid through determining partial discharge position.
Above-mentioned cable local discharge positioning device judges whether have through the determining partial discharge position using processor
Effect, can be improved the accuracy that cable local discharge positioning device is positioned.
With reference to Fig. 3, two signals shown in the cable local discharge positioning device according to one embodiment of the application are adopted
Storage acquires the schematic diagram of the time difference of signal.As shown in Figure 1, illustratively, synchronization pulse generator 120 is in tested electricity
The left side of cable, is denoted as collector 1 for the signal picker in left side, and the signal picker on right side is denoted as collector 2.Wherein, t1
The time difference of synchronization pulse, i.e. t1=L/v are collected for collector 1 and collector 2, wherein L is the length of tested cable
Degree, v are the spread speed of synchronization pulse in the cable.T2 is that collector 1 and collector 2 collect in tested cable (no
Including be tested cable ends position) same local discharge signal time difference, t2=x/v- (L-x)/v (t2 can for positive value,
0 can also be can be equal to for negative value, be specifically dependent upon the value of x, 0 < x < L), wherein x is the seat of the partial discharge position on tested cable
Mark (using tested cable left end as the coordinate origin of one-dimensional coordinate system), v is the spread speed of local discharge signal in the cable, with
The spread speed of synchronization pulse in the cable is identical.Therefore, t1 > | t2 |, andTherefore, it is possible to root
The time difference t1 of synchronization pulse is collected according to two signal pickers and collects the same shelf depreciation in tested cable
The time difference t2 of signal determines partial discharge position x.
Present invention also provides a kind of cable local discharge localization methods, as shown in figure 4, showing real according to the application one
The flow chart of the cable local discharge localization method of example is applied, this method comprises:
Step S100 obtains the collected signal of described two signal pickers.
Specifically, clock-pulse generator 120 generates synchronization pulse, with synchronous two signal pickers 160.Two
140 sensing signal of sensor, the signal sensed include synchronization pulse and local discharge signal.Two signal pickers
160 acquire and handle the signal that corresponding sensor senses.After two signal pickers 160 receive synchronization pulse,
Start to acquire local pulse signal.Processor can be used and obtain the two signal pickers 160 from two signal pickers 160
Collected signal and the time for collecting signal.Processor may include in one in two signal pickers 160,
It can also be separately provided.
Step S200 identifies synchronization pulse and local discharge signal in the signal.
Specifically, two collected signals of signal picker 160 include synchronization pulse and local discharge signal, are needed
Synchronization pulse therein and local discharge signal are distinguished.
Step S300 collects the time difference of local discharge signal according to two signal pickers and collects lock-out pulse
The time difference of signal determines the partial discharge position on tested cable.
Specifically, the time difference of local discharge signal is collected according to two signal pickers and collect lock-out pulse letter
Number time difference determine the partial discharge position on tested cable.For example, can be obtained as above with reference to method described in Fig. 3
It arrives
Step S400, judge it is whether effective through the determining partial discharge position, if effectively, being put according to the part
Electric position is positioned.
Specifically, multiple position shelf depreciations, therefore two collected offices of signal picker may be had by being tested on cable
Portion's discharge signal may belong to the local discharge signal of same position sending, it is also possible to belong to the shelf depreciation of different location sending
Signal, it is therefore desirable to judge whether two collected local discharge signals of signal picker belong to same partial discharge position,
It whether is the local discharge signal issued from same partial discharge position.If it is determined that belonging to same partial discharge position, then
It is effective through determining partial discharge position, and positioned according to the partial discharge position.
Above-mentioned cable local discharge localization method obtains the collected signal of described two signal pickers and according to two
Signal picker collects the time difference of local discharge signal and collects the time difference determining tested cable of synchronization pulse
On partial discharge position, in addition, also judge it is whether effective through determining partial discharge position, thus can simply accurately really
Determine the position of shelf depreciation on cable.
In one embodiment, as shown in figure 5, step S200, identifies the synchronization pulse in the signal and part
Discharge signal, comprising:
Step S210 carries out hardware filtering to the signal of acquisition, to obtain the signal after preliminary noise reduction.
Step S220 carries out analog-to-digital conversion to the signal after preliminary noise reduction, to obtain the signal after analog-to-digital conversion.
Step S230 carries out software filtering to the signal after analog-to-digital conversion, to obtain the signal after further noise reduction.
Step S240, the synchronization pulse and local discharge signal in signal after identifying noise reduction.
Step S250 stores the local discharge signal identified.
Specifically, step S200 includes: to carry out hardware filtering to collected signal, to obtain the letter after preliminary noise reduction
Number；Then analog-to-digital conversion is carried out to the signal after preliminary noise reduction, to obtain the signal after analog-to-digital conversion；And after analog-to-digital conversion
Signal carry out software filtering, to obtain further filtered signal, so that the result of subsequent processing is more acurrate.Step
S200 further includes by the synchronization pulse in the signal after synchronization pulse match cognization noise reduction, thus by lock-out pulse
Signal and local discharge signal distinguish, and local discharge signal is stored in a storage unit, for subsequent further
Processing and analysis.
In one embodiment, as shown in fig. 6, step S300, collects shelf depreciation letter according to two signal pickers
Number time difference and collect time difference of synchronization pulse and determine partial discharge position on tested cable, comprising:
Step S310 collects the time difference of local discharge signal according to two signal pickers and collects lock-out pulse
The time difference of signal determines whether partial discharge position belongs to tested cable.
Specifically, two collected local discharge signals of signal picker may be that the position from tested cable issues
Local discharge signal, it is also possible to from except tested cable position issue local discharge signal, it is therefore desirable to according to two
The time difference that a signal picker collects local discharge signal determines that part is put with the time difference for collecting synchronization pulse
Whether electric position belongs to tested cable.
Step S320 collects office according to two signal pickers when determining that partial discharge position belongs to tested cable
The time difference of portion's discharge signal and the time difference for collecting synchronization pulse determine the partial discharge position on tested cable.
Specifically, when partial discharge position belongs to tested cable, shelf depreciation is collected according to two signal pickers
The time difference of signal and the time difference for collecting synchronization pulse determine the partial discharge position on tested cable.For example, such as
It is available above with reference to method described in Fig. 3When partial discharge position is not belonging to tested cable,
Signal is not positioned.
In one embodiment, as shown in fig. 7, step S310, collects shelf depreciation letter according to two signal pickers
Number time difference and collect time difference of synchronization pulse and determine whether partial discharge position belongs to tested cable, comprising:
Step S311 judges that two signal pickers collect whether time difference of synchronization pulse is greater than and collects office
The time difference of portion's discharge signal thens follow the steps S313 if so then execute step S312 if not.
Step S312 determines that partial discharge position belongs to tested cable.
Step S313 determines that partial discharge position is not belonging to tested cable.
Specifically, as shown in figure 3, the time difference that two signal pickers collect synchronization pulse is t1, t1=L/
v；Two signal pickers collect in tested cable the local discharge signal of the position of cable ends (do not include tested) when
Between difference be t2, t2=x/v- (L-x)/v, t1 > | t2 |.When local discharge signal is not belonging to tested cable, two signal acquisitions
The signal difference that device collects the local discharge signal outside tested cable is t3, t3=L/v, so t3=t1.Therefore, when two are believed
When the time difference that number collector collects synchronization pulse is greater than the time difference for collecting local discharge signal, shelf depreciation position
It sets and belongs to tested cable (not including the position of tested cable ends), otherwise partial discharge position is not belonging to tested cable.
Above-mentioned cable local discharge localization method, by comparing two signal pickers collect synchronization pulse when
Between difference and collect time difference of local discharge signal, can quickly and easily determine partial discharge position whether in tested cable
In.
In one embodiment, as shown in figure 8, judgement in step S400 through the determining partial discharge position whether
Effectively, comprising:
Two collected local discharge signals of signal picker are compared, determine described two letters by step S410
The similarity of number collected local discharge signal of collector.
Specifically, the discharge characteristic for the local discharge signal that same partial discharge position issues is similar, by believing two
Number collected local discharge signal of collector is compared, and can determine the similarity of collected local discharge signal, phase
Higher like spending, the probability for belonging to same partial discharge position is higher.
Step S420, judges whether similarity is greater than preset similarity threshold, if so then execute step S430, if otherwise
Execute step S450.
Step S430 judges whether two collected local discharge signals of signal picker accord with according to partial discharge position
It closes attenuation law and thens follow the steps S450 if not if so, thening follow the steps S440.
Step S440 determines that the partial discharge position is effective.
Step S450 determines that the partial discharge position is invalid.
Specifically, similarity threshold is preset according to actual needs, and judges whether to be greater than through determining similarity pre-
If similarity threshold.If being greater than preset similarity threshold through determining similarity threshold, put according to through determining part
Electric position judges whether two collected local discharge signals of signal picker meet attenuation law, otherwise determines the part
Discharge position is invalid.Here attenuation law refers to that signal picker is remoter away from discharge position, then collected shelf depreciation letter
Number amplitude it is smaller.For example, with reference to Fig. 1, if partial discharge position x < L/2, the collected office of signal picker in left side
The amplitude of portion's discharge signal is greater than the amplitude of the collected local discharge signal of signal picker on right side.When two signal acquisitions
When the collected local discharge signal of device meets attenuation law, determine that the partial discharge position is effective.When two signal acquisitions
When the collected local discharge signal of device does not meet attenuation law, determine that the partial discharge position is invalid.
Above-mentioned cable local discharge localization method meets similar in two collected local discharge signals of signal picker
It when spending threshold value and meeting attenuation law, just determines that partial discharge position is effective, thus the accuracy of positioning can be significantly improved.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of cable local discharge positioning device, which is characterized in that described device includes: clock-pulse generator, two biographies
Sensor and two signal pickers, wherein
The clock-pulse generator is connected to one end of tested cable, for generating synchronization pulse；
Described two sensors are connected to the both ends of the tested cable, are used for sensing signal, and the signal includes synchronizing
Pulse signal and local discharge signal, the clock-pulse generator and the sensor for the same side for being located at the tested cable connect
It connects；
Described two signal pickers connect one to one with described two sensors, acquire and handle corresponding sensor sensing
To signal with the position of shelf depreciation on the determination tested cable.
2. the apparatus according to claim 1, which is characterized in that the signal picker includes:
First filter unit, for being filtered to collected signal, to obtain the signal after preliminary noise reduction；
Analog-digital converter is connect with first filter unit, to carry out analog-to-digital conversion to the signal after the preliminary noise reduction；
Second filter unit is connect with the analog-digital converter, to be filtered to the signal after analog-to-digital conversion, to obtain into one
Signal after walking noise reduction；
Lock-out pulse matching unit is connect with second filter unit, for by after the further noise reduction signal and institute
It states synchronization pulse to be matched, whether is synchronization pulse with the collected signal of determination；And
Storage unit is connect with the lock-out pulse matching unit, to store collected local discharge signal.
3. device according to claim 2, which is characterized in that described two signal picker communication connections, and institute
Stating includes processor in a signal picker in two signal pickers, and the processor is used for according to described two signals
Collector collects the time difference of synchronization pulse and the time difference for collecting same local discharge signal determines described be tested
Partial discharge position on cable.
4. device according to claim 3, which is characterized in that the processor is also used to judge through the determining part
Whether discharge position is effective.
5. device described in any one of -4 according to claim 1, which is characterized in that the clock-pulse generator generates pulsewidth
With the adjustable step pulse signal of amplitude.
6. a kind of shelf depreciation positioning side based on cable local discharge positioning device of any of claims 1-5
Method, which is characterized in that the described method includes:
Obtain the collected signal of described two signal pickers；
Identify the synchronization pulse and local discharge signal in the signal；
The time difference of the local discharge signal is collected according to described two signal pickers and collects the lock-out pulse
The time difference of signal determines the partial discharge position on tested cable；
Judge it is whether effective through the determining partial discharge position, if effectively, being determined according to the partial discharge position
Position.
7. according to the method described in claim 6, it is characterized in that, the synchronization pulse drawn game identified in the signal
Portion's discharge signal, comprising:
Hardware filtering is carried out to the signal of acquisition, to obtain the signal after preliminary noise reduction；
Analog-to-digital conversion is carried out to the signal after preliminary noise reduction, to obtain the signal after analog-to-digital conversion；
Software filtering is carried out to the signal after analog-to-digital conversion, to obtain the signal after further noise reduction；
The synchronization pulse and local discharge signal in signal after identifying noise reduction；And
Store the local discharge signal identified.
8. according to the method described in claim 6, it is characterized in that, it is described collected according to described two signal pickers it is described
The time difference of local discharge signal and the time difference for collecting the synchronization pulse determine the shelf depreciation on tested cable
Position, comprising:
The time difference of the local discharge signal is collected according to described two signal pickers and collects the lock-out pulse
The time difference of signal determines whether the partial discharge position belongs to the tested cable；
When determining that the partial discharge position belongs to the tested cable, collected according to described two signal pickers described
The time difference of local discharge signal and the time difference for collecting the synchronization pulse determine the shelf depreciation on tested cable
Position.
9. according to the method described in claim 8, it is characterized in that, it is described collected according to described two signal pickers it is described
Whether the time difference of local discharge signal and the time difference for collecting the synchronization pulse determine the partial discharge position
Belong to the tested cable, comprising:
Judge that described two signal pickers collect whether time difference of the synchronization pulse is greater than and collects the office
The time difference of portion's discharge signal, if so, the partial discharge position belongs to the tested cable.
10. according to the method described in claim 6, it is characterized in that, the judgement is through the determining partial discharge position
It is no effective, comprising:
The collected local discharge signal of described two signal pickers is compared, determines that described two signal pickers are adopted
The similarity of the local discharge signal collected；
Judge whether the similarity is greater than preset similarity threshold, if so, judging institute according to the partial discharge position
State whether the collected local discharge signal of two signal pickers meets attenuation law, if so, determining the part
Discharge position is effective.
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