CN105093075A - Cable partial discharge positioning system and method based on travelling wave principle - Google Patents
Cable partial discharge positioning system and method based on travelling wave principle Download PDFInfo
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Abstract
Provided is a cable partial discharge positioning system and method based on the travelling wave principle. A cable line (1) is included. The system is characterized in that the two ends of the cable line (1) are respectively provided with travelling wave collectors (4) which are used for collecting travelling wave pulse signals, the travelling wave collector (4) at each end is connected with a time synchronization unit used for time synchronization, and the travelling wave collectors (4) at the two ends of the cable line (1) are connected via a communication network (2). According to the system, the travelling wave collectors are used for collecting fault travelling-wave pulse waveforms in the cable line, and time synchronization signals provided by a GPS time synchronization device are used to accurately determine fault points, so that positioning time is short, and the cable line is prevented from secondary damage.
Description
Technical field
Based on cable local discharge positioning system and the localization method of row ripple principle, belong to power system automation technology field.
Background technology
Power cable fault location technology contributes to the workload greatly reducing to search and even repair cable fault, thus improves the power supply reliability of power cable.Along with the development of modern urban construction, electricity need load constantly increases, and existing overhead transmission line cannot meet the needs of urban development, and crisscross overhead transmission line also affects the overall image in city.Therefore, cable system is powered and is replaced original overhead transmission line and power and become the inexorable trend of urban distribution network development, and the demand of power department to power cable fault location technology is fast and accurately also more and more urgent.
Now widely used power cable fault location technology is off-line location technology, namely when cable has a power failure, utilizes applying pulse signal to come the position of exploration cable trouble spot.Its subject matter existed is that fault location time is long, and may cause secondary injury to cable, can not ensure the accuracy rate of 100%, therefore, existing power cable shelf depreciation location technology needs specific synchronous method or pulse transceiver, and consumes resources is comparatively large, and positioning precision is lower.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, when providing one by accurate pair, fault traveling wave pulse waveform in cable line is gathered, and the fault traveling wave pulse waveform collected is processed, realize the pinpoint cable local discharge positioning system based on row ripple principle in trouble spot and localization method.
The technical solution adopted for the present invention to solve the technical problems is: should based on the cable local discharge positioning system of row ripple principle, comprise cable line, it is characterized in that: be respectively arranged with one is rushed signal row ripple harvester for gathering traveling wave maser at the two ends of cable line, the row ripple harvester of every one end be all connected with for pair time pair time unit, the row ripple harvester at cable line two ends is connected by communication network.
Preferably, described row ripple harvester at least comprises:
Simulating signal input block, rushes signal for the traveling wave maser received in described cable line;
Data acquisition unit, its input end is connected with simulating signal input block output terminal, and reception traveling wave maser rushes signal and rushes signal to traveling wave maser to be nursed one's health, store and send;
CPU (central processing unit), its input end is connected with the output terminal of data acquisition unit, receive and process data acquisition unit conveying conditioned traveling wave maser rush signal, the fault distance in cable line is judged;
Clock synchronization unit, its input end is connected with unit when described pair, and its output terminal connects the input end of CPU (central processing unit), signal when to send pair to CPU (central processing unit);
And communication unit, its input end is connected with the output terminal of CPU (central processing unit), and data central processing unit for processing obtained send.
Preferably, described row ripple harvester also comprises:
Switching signal input block, is connected with the input end of described CPU (central processing unit), and the on-off model for external device (ED) inputs;
Switching signal output unit, is connected with the output terminal of CPU (central processing unit), starts and self-inspection abnormal alarm for device;
Human-machine interface unit, for indicating plant running state.
Preferably, described data acquisition unit, comprising:
Signal-regulated kinase, is connected with described simulating signal input block, is converted to weak electric signal for the original signal inputted by simulating signal input block;
Analog-to-digital conversion module, its input end is connected with Signal-regulated kinase output terminal, and the signal exported for Received signal strength conditioning module also carries out analog to digital conversion to signal;
Digital signal processing module, its input end is connected with the output terminal of analog-to-digital conversion module, processes for the signal exported analog-to-digital conversion module, store and sends;
And peripheral interface module, its input end is connected with the output terminal of digital signal processing module, and output terminal is connected with described CPU (central processing unit), for completing the transmission of data and order.
Preferably, described pair time unit be GPS timing device.
Preferably, in described row ripple harvester, the input trigger circuit carrying out threshold detection for rushing signal to traveling wave maser are also provided with.
Preferably, in described communication network, be also connected with the row ripple positioning master station realizing communication with row ripple harvester.
Based on the cable local discharge localization method of row ripple principle, it is characterized in that, comprise the steps:
Step a, row ripple harvester carries out Real-Time Monitoring to the waveform in cable line;
Step b, row ripple harvester rushes signal to traveling wave maser and carries out threshold monitoring, judges whether to exceed presetting detection threshold, if exceed presetting detection threshold, then represent in cable line and break down, perform step c, if do not exceed presetting detection threshold, return step a;
Step c, row ripple harvester rushes signal to the traveling wave maser collected and processes according to acquisition process flow process;
Steps d, row ripple harvester to process in step c the data that obtain and pair time unit clock signal obtain fault initial absolute time and Wave data;
Step e, the initial absolute time of the fault waveform that the row ripple harvester that row ripple harvester transfers the other end in cable line by communication network calculates and Wave data;
Step f, row ripple harvester calculates fault apart from two ends distance, and result of calculation is uploaded by communication network 2.
Preferably, the acquisition process flow process described in step c, comprises the steps:
Step c1, start data acquisition unit, data acquisition unit rushes signal to the traveling wave maser received and nurses one's health and analog to digital conversion;
Step c2, the digital signal obtained after conversion is added markers by data acquisition unit;
Step c3, the data be converted to store by data acquisition unit, and are sent to CPU (central processing unit);
Step c4, CPU (central processing unit) receives the data that data acquisition unit is delivered to, and adopts wavelet algorithm to process, obtains fault initial absolute time and Wave data.
Compared with prior art, the beneficial effect that the present invention has is:
1, by the cable local discharge positioning system originally based on row ripple principle, by row ripple harvester, the fault traveling wave pulse waveform in cable line is gathered, and in conjunction with GPS timing device provide pair time signal trouble spot is accurately judged, positioning time is short, and can not cause secondary damage to cable line.
2, by GPS timing device, precision can be provided to reach the clock signal of 0.01 μ s level, make time parameter more accurate.
3, by being provided with input trigger circuit in row ripple harvester, only have when collected pulse amplitude exceedes a certain detecting gate threshold value, the output level of trigger circuit just overturns, and improves antijamming capability.
4, adopt conventional current transformer as the signal conversion part in Signal-regulated kinase, can progress of disease high frequency transient current signal well, meet the requirement of traveling wave fault location.Row ripple harvester as common protective relaying device, directly can access the secondary circuit of current transformer, does not need to install the capable Wave coupling equipment of any high pressure simultaneously; invest little; easy for installation, easily accepted by Regulation department, facilitate applying of travelling wave ranging technology.
Adopting dsp chip as digital signal processing module in the data acquisition unit of 5, row ripple harvester, by arranging dsp chip, possessing the advantage that process data speed is fast, process data volume is large, processing accuracy is high.Feature due to dsp chip itself can complete a lot of complicated mathematics manipulation algorithm, and the speed of dsp chip when doing various complex calculation is improved greatly.
Accompanying drawing explanation
Fig. 1 is the cable local discharge positioning system structure schematic diagram based on row ripple principle.
Fig. 2 is the cable local discharge positioning system fault traveling wave harvester functional-block diagram based on row ripple principle.
Fig. 3 is that traveling wave maser rushes curve map.
Fig. 4 is the cable local discharge positioning system failure data acquisition unit functional-block diagram based on row ripple principle.
Fig. 5 is the cable local discharge localization method process flow diagram based on row ripple principle.
Wherein: 1, cable line 2, communication network 3, row ripple positioning master station 4, row ripple harvester 5, GPS timing device.
Embodiment
Fig. 1 ~ 5 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 5, the present invention will be further described.
As shown in Figure 1, based on the cable local discharge positioning system of row ripple principle, comprise and be arranged on cable line 1 two ends respectively: the row ripple harvester 4 of M end, N end, each row ripple harvester 4 is all equipped with a GPS timing device 5, and row ripple harvester 4 and the row ripple positioning master station 3 at cable line 1 two ends are connected by communication network 2.
When breaking down in monitored cable line 1, row ripple harvester 4 pairs of traveling wave masers at cable line 1 two ends are rushed in row and are detected, row ripple harvester 4 when cable line 1 two ends detects that traveling wave maser records row wave datum after rushing due in, then wavelet algorithm is utilized to process fault data and revise, finally determine that traveling wave maser rushes due in accurately, then by communication network 2, row wave datum is uploaded in row ripple positioning master station 3, by the final localization of faults position of row ripple positioning master station 3.
As shown in Figure 2, row ripple harvester 4 comprises: simulating signal input block, data acquisition unit, CPU (central processing unit), switching signal input block, clock synchronization unit, human-machine interface unit, switching signal output unit and communication unit.Simulating signal input block is connected with data acquisition unit, data acquisition unit is connected with CPU (central processing unit), switching signal input block is connected with CPU (central processing unit) with clock synchronization unit, and CPU (central processing unit) is connected with switching signal output unit, human-machine interface unit and communication unit simultaneously.
In one's own profession ripple harvester 4, signal for receiving the simulating signal on cable line 1, and is sent into data acquisition unit by simulating signal input.Clock synchronization unit is connected with above-mentioned GPS timing device 5.GPS timing device 5 reaches the clock signal of 0.01 μ s level to CPU (central processing unit) output accuracy by clock synchronization unit, row ripple harvester 4 realizes the determination of traveling wave maser being rushed to accurate due in by this clock signal.Communication interface comprises two RS232/RS485 interfaces and an Ethernet interface.Ethernet interface is used for realizing uploading of waveform recording by communication network 2.RS-232/RS485 interface is respectively used to support to upload row ripple record with the form of point-to-point serial communication and adjust for device to configure and maintain communications.
Switching signal input block comprises the idle contact input of a pair Phototube Coupling, and the on-off model for external device (ED) inputs, and can be the input of the on-off model such as the actuating signal of protective device or the actuating signal of isolating switch.The idle contact that switching signal output unit comprises two pairs of Phototube Coupling exports, and is respectively used to device and starts and self-inspection abnormal alarm.Contact exports and can require to deliver to monitoring system of electric substation or fault information management system according to rig-site utilization.Human-machine interface unit is used for indicating plant running state, and as startup (triggering) instruction, synchronizing signal normally indicates, device indicates extremely, communication indicates.
CPU (central processing unit) is the core cell of row ripple harvester 4, and its major function reads, processes transient state travelling wave data from data acquisition unit, and cache lines ripple record also uploads to row ripple positioning master station 3.CPU (central processing unit) also coordinates the work of whole harvester, and deadline synchronous, configuration parameter of adjusting management, running status instruction, device trigger and the function such as fault alarm.
In order to improve antijamming capability, be expert at ripple harvester 4 simulating signal input block in be also provided with input trigger circuit, only have when collected pulse amplitude exceedes a certain detecting gate threshold value, the output level of trigger circuit just overturns, and rushing in this, as latching traveling wave maser the control signal reaching the moment, input trigger circuit realize by the comparator circuit of routine.
As shown in Figure 3, the S1 wherein in y-axis is the detecting gate threshold value of setting.In actual condition environment, owing to inevitably there is loss in cable line 1, therefore cause traveling wave maser to be punched in communication process will inevitably decay, and attenuation degree aggravates along with the rising of frequency and the increase of propagation distance, always there is certain rise time in the traveling wave maser punching thus arriving line end measurement point, therefore there is certain deviation between the actual due in that input trigger circuit upset moment and traveling wave maser rush, as shown in Figure 3, time t1 and time t2 is respectively the actual due in of traveling wave maser punching and input trigger circuit are actual the moment that traveling wave maser rushes detected, due to life period deviation, therefore can cause to traveling wave maser rush due in judge there is deviation, therefore this needs to take digital signal processing method revised further.
From the above, in one's own profession ripple harvester 4, adopt wavelet algorithm to traveling wave maser strokes per minute according to revising.Small echo bob is a kind of T/F analytical approach, and has adjustable time frequency resolution characteristic (" microscope " characteristic), and this makes wavelet transformation become effective mathematical measure of travelling wave analysis and travelling waves extraction.In one's own profession ripple harvester 4, adopt the due in that dyadic wavelet transform modulus maximum detection method acquisition row wave gushes, wherein mother wavelet function is chosen for 1 rank derived function of three subcenter B-spline functions.
Analysis shows, there is one-to-one relationship between Spline smoothing transient signal and its dyadic wavelet modulus maximum, namely the step transient characteristic that has of the polarity of the position of Wavelet Modulus Maxima point, modulus maximum, amplitude and their variation relations under different scale and signal itself is corresponding one by one.Therefore, demarcate the due in of step signal according to wavelet modulus maxima, under any circumstance the calibrated error of signal due in can both be controlled within 1 sampling interval.
As shown in Figure 4, the data acquisition unit in row ripple harvester 4 comprises Signal-regulated kinase, analog-to-digital conversion module, digital signal processing module and peripheral interface module.Signal-regulated kinase is connected with above-mentioned simulating signal input block, its output terminal is connected with analog-to-digital conversion module input end, the output terminal of analog-to-digital conversion module is connected with digital signal processing module input end, the output terminal of digital signal processing module is connected with peripheral interface module, and the output terminal of peripheral interface module is connected with above-mentioned CPU (central processing unit).Also be provided with the power management module that Signal-regulated kinase, analog-to-digital conversion module, digital signal processing module and peripheral interface module are powered.
The original signal that Signal-regulated kinase is used for simulating signal input block inputs is converted to weak electric signal, and range of signal is transformed into the input range of analog to digital conversion requirement.Form primarily of current transformer, amplifying circuit and biasing circuit during the physical circuit of Signal-regulated kinase is arranged.The Main Function of current transformer is that the original current signal of primary side is converted to weak electric signal; The small area analysis signal changed to through mutual inductor is converted into voltage signal by subsidiary amplifying circuit, and in accordance with the appropriate ratio voltage signal is amplified; Biasing circuit main task utilizes adding circuit bipolarity AC signal to be superposed, and then be converted to unipolar signal, and this signal is applicable to modulus collection.
Conventional current transformer can transmit well and uprise transient current signal frequently, meets the requirement of traveling wave fault location.Therefore, row ripple harvester 4 as common protective relaying device, can directly access the secondary circuit of current transformer.Device utilizes the secondary of current transformer to export and forms travelling wave ranging signal, does not need to install the capable Wave coupling equipment of any high pressure, invests little, easy for installation, is easily accepted by Regulation department, facilitates applying of travelling wave ranging technology.
Analog-to-digital conversion module is used for carrying out analog to digital conversion to signal, and the digital quantity obtained is stored in the memory location of specifying.Filtering circuit and analog to digital conversion circuit is mainly comprised during the physical circuit of analog-to-digital conversion module is arranged.
Digital signal processing module is used for carrying out cooperation control to the various piece of whole system, is responsible for the expansion etc. of storer and peripheral hardware.In physical circuit is arranged, main circuit will comprise dsp chip and accessory circuit, as system clock, storer and peripheral expansion, control/status register expansion etc.By arranging dsp chip, possesses the advantage that process data speed is fast, process data volume is large, processing accuracy is high.Feature due to dsp chip itself can complete a lot of complicated mathematics manipulation algorithm, and the speed of dsp chip when doing various complex calculation is improved greatly.Peripheral interface module comprises serial communication interface and usb communication interface, for completing the transmission of data and order.
As shown in Figure 5, based on the cable local discharge localization method of row ripple principle, comprise the steps:
Step 1, standby;
In the standby state, the waveform in row ripple harvester 4 pairs of cable lines 1 carries out Real-Time Monitoring.
Step 2, carries out pre-service to input signal and detects whether get over line;
Input trigger circuit in row ripple harvester 4 rush signal to the traveling wave maser collected and carry out threshold monitoring, judge whether to exceed presetting detection threshold, if exceed presetting detection threshold, then represent in cable line 1 and break down, perform step 3, if do not exceed presetting detection threshold, return step 1.
Step 3, starts data acquisition unit and changes signal transacting, and the digital signal after conversion is added markers;
Data acquisition unit is started working, and rushes signal process and analog to digital conversion the traveling wave maser received, and the digital signal obtained after conversion is added markers.
The data be converted to are carried out storing and sending by step 4;
The data be converted to store by data acquisition unit, and are sent to CPU (central processing unit).
Step 5, processes data, determines that fault initial time and traveling wave maser rush Wave data;
CPU (central processing unit) receives the data that data acquisition unit is delivered to, and data is carried out to the process such as filtering, and adopts the mathematical tool comprising wavelet algorithm to process, and obtains fault initial absolute time and Wave data.
Step 6, transfers peer failure initial absolute time and Wave data;
The initial absolute time of the fault waveform that the row ripple harvester 4 that row ripple harvester 4 transfers the other end in cable line 1 by communication network 2 calculates and Wave data.
Step 7, calculates trouble spot distance and uploads;
Row ripple harvester 4 calculates fault apart from two ends distance according to cable line 1 total length, fault waveform velocity of propagation and both-end fault initial absolute time, and result of calculation is uploaded to row ripple positioning master station 3 automatically by communication network 2.
Step 8, terminates;
Localization of fault terminates.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (9)
1. based on the cable local discharge positioning system of row ripple principle, comprise cable line (1), it is characterized in that: be respectively arranged with one is rushed signal row ripple harvester (4) for gathering traveling wave maser at the two ends of cable line (1), the row ripple harvester (4) of every one end be all connected with for pair time pair time unit, the row ripple harvester (4) at cable line (1) two ends is connected by communication network (2).
2. the cable local discharge positioning system based on row ripple principle according to claim 1, is characterized in that: described row ripple harvester (4) at least comprises:
Simulating signal input block, rushes signal for the traveling wave maser received in described cable line (1);
Data acquisition unit, its input end is connected with simulating signal input block output terminal, and reception traveling wave maser rushes signal and rushes signal to traveling wave maser to be nursed one's health, store and send;
CPU (central processing unit), its input end is connected with the output terminal of data acquisition unit, receive and process data acquisition unit conveying conditioned traveling wave maser rush signal, the fault distance in cable line (1) is judged;
Clock synchronization unit, its input end is connected with unit when described pair, and its output terminal connects the input end of CPU (central processing unit), signal when to send pair to CPU (central processing unit);
And communication unit, its input end is connected with the output terminal of CPU (central processing unit), and data central processing unit for processing obtained send.
3. the cable local discharge positioning system based on row ripple principle according to claim 2, is characterized in that: described row ripple harvester (4) also comprises:
Switching signal input block, is connected with the input end of described CPU (central processing unit), and the on-off model for external device (ED) inputs;
Switching signal output unit, is connected with the output terminal of CPU (central processing unit), starts and self-inspection abnormal alarm for device;
Human-machine interface unit, for indicating plant running state.
4. the cable local discharge positioning system based on row ripple principle according to claim 2, is characterized in that: described data acquisition unit, comprising:
Signal-regulated kinase, is connected with described simulating signal input block, is converted to weak electric signal for the original signal inputted by simulating signal input block;
Analog-to-digital conversion module, its input end is connected with Signal-regulated kinase output terminal, and the signal exported for Received signal strength conditioning module also carries out analog to digital conversion to signal;
Digital signal processing module, its input end is connected with the output terminal of analog-to-digital conversion module, processes for the signal exported analog-to-digital conversion module, store and sends;
And peripheral interface module, its input end is connected with the output terminal of digital signal processing module, and output terminal is connected with described CPU (central processing unit), for completing the transmission of data and order.
5. the cable local discharge positioning system based on row ripple principle according to claim 1 and 2, is characterized in that: when described pair, unit is GPS timing device (5).
6. the cable local discharge positioning system based on row ripple principle according to any one of claim 1 ~ 3, is characterized in that: in described row ripple harvester (4), be also provided with the input trigger circuit carrying out threshold detection for rushing signal to traveling wave maser.
7. the cable local discharge positioning system based on row ripple principle according to claim 1, is characterized in that: in described communication network (2), be also connected with the row ripple positioning master station (3) realizing communication with row ripple harvester (4).
8. the cable local discharge localization method based on row ripple principle utilizing the cable local discharge positioning system based on row ripple principle described in any one of claim 1 ~ 7 to realize, is characterized in that, comprise the steps:
Step a, row ripple harvester (4) carries out Real-Time Monitoring to the waveform in cable line (1);
Step b, row ripple harvester (4) rushes signal to traveling wave maser and carries out threshold monitoring, judge whether to exceed presetting detection threshold, if exceed presetting detection threshold, then represent in cable line (1) and break down, perform step c, if do not exceed presetting detection threshold, return step a;
Step c, row ripple harvester (4) rushes signal to the traveling wave maser collected and processes according to acquisition process flow process;
Steps d, row ripple harvester (4) to process in step c the data that obtain and pair time unit clock signal obtain fault initial absolute time and Wave data;
Step e, the initial absolute time of the fault waveform that the row ripple harvester (4) that row ripple harvester (4) transfers the other end in cable line (1) by communication network (2) calculates and Wave data;
Step f, row ripple harvester (4) calculates fault apart from two ends distance, and result of calculation is uploaded by communication network (2).
9. utilize the cable local discharge localization method based on row ripple principle of claim 8, it is characterized in that, the acquisition process flow process described in step c, comprises the steps:
Step c1, start data acquisition unit, data acquisition unit rushes signal to the traveling wave maser received and nurses one's health and analog to digital conversion;
Step c2, the digital signal obtained after conversion is added markers by data acquisition unit;
Step c3, the data be converted to store by data acquisition unit, and are sent to CPU (central processing unit);
Step c4, CPU (central processing unit) receives the data that data acquisition unit is delivered to, and adopts wavelet algorithm to process, obtains fault initial absolute time and Wave data.
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