CN104678266B - A kind of long range high-tension cable shelf depreciation both-end alignment system and method - Google Patents
A kind of long range high-tension cable shelf depreciation both-end alignment system and method Download PDFInfo
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- CN104678266B CN104678266B CN201510060985.1A CN201510060985A CN104678266B CN 104678266 B CN104678266 B CN 104678266B CN 201510060985 A CN201510060985 A CN 201510060985A CN 104678266 B CN104678266 B CN 104678266B
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Abstract
The invention discloses a kind of long range high-tension cable shelf depreciation both-end alignment system and method, including：Partial discharge collection main equipment, partial discharge collection slave unit and communication module；Partial discharge gathers main equipment and partial discharge collection slave unit is connected to the two ends of power cable to be detected；The partial discharge collection main equipment gathers slave unit and is communicated by communication module and partial discharge.Beneficial effect of the present invention：The distance and signaling rate for changing traditional measurement high-tension cable seek signal lag, the time delay that the present invention is gone out between partial discharge collecting device using the Similarity Measure of high-tension cable oscillating wave voltage, and greatly reduce the noise signal near useful signal afterwards after filtering, improve delay precision.
Description
Technical field
The present invention relates to power cable Partial Discharge Detection field, and in particular to a kind of long range high-tension cable shelf depreciation
Both-end alignment system and method.
Background technology
With economic fast development, the power consumption of urban distribution network increases year by year, with reference to the design for aesthetic in city, electric power electricity
The substantial amounts of of cable is used, it has also become the major product of electric power is transmitted in city.Because the insulating structure design of cable and scene are applied
The reasons such as work technique, and the life-span of cable is aging, and the Insulation Problems of cable are more and more, shelf depreciation (hereinafter referred to as partial discharge)
It is especially prominent.If cable partial discharge Insulation Problems can not timely be detected and processed, once cable insulation punctures may result in weight
Large-scale blackout, influences the normal operation in city.Therefore, to the research of the partial discharge detection and localization method of twisted polyethylene cable
It is particularly important.
At present, cable partial discharge localization method mainly uses time domain reflectometry.The serious problems that the above method is present are just
It is if when running into wireline test long, because cable partial discharge signal belongs to high-frequency signal, transmission on long cables has serious biography
Defeated attenuation characteristic, so with time domain reflectometry on cable partial discharge long is positioned, it is impossible to carry out partial discharge location.Current electricity both domestic and external
Cable partial discharge detection instrument cannot all realize the cable partial discharge positioning of long range.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of long range high-tension cable is locally put
Electric both-end alignment system and method, the system and method obtain Partial discharge signal and reach two ends according to the correlation of Partial discharge signal
Time difference, so that it is determined that partial discharge position, improves the partial discharge location precision of long-distance cable.
To achieve the above object, the present invention uses following technical proposals：
A kind of long range high-tension cable shelf depreciation both-end alignment system, including：Partial discharge collection main equipment, partial discharge collection from
Equipment and communication module；
The partial discharge collection main equipment and partial discharge collection slave unit are connected to the two ends of power cable to be detected；Institute
Partial discharge collection main equipment is stated to be communicated by communication module and partial discharge collection slave unit.
A kind of localization method of long range high-tension cable shelf depreciation both-end alignment system, comprises the following steps：
(1) acquisition parameter of partial discharge collecting device is set, is set up between partial discharge collection main equipment and partial discharge collection slave unit
Communication；
(2) the oscillating wave voltage triggering partial discharge collection main equipment and partial discharge collection slave unit on high-tension cable, partial discharge collection
Main equipment and partial discharge collection slave unit carry out the collection of oscillating wave voltage and Partial discharge signal on high-tension cable respectively；
(3) after the completion of signal acquisition, the data transfer of partial discharge collection slave unit collection to partial discharge collection main equipment is carried out
Synchronization process, calculates the time delay △ t that partial discharge collection main equipment gathers slave unit synchronous data sampling with partial discharge；
(4) the partial discharge data after synchronization are divided into some segment datas by partial discharge collection main equipment according to △ t, respectively to described
Some segment datas carry out Partial discharge signal filtering process, and obtain the time difference that Partial discharge signal reaches cable two ends, obtain final product out partial discharge
Orientation distance, so as to calculate average partial discharge location distance.
Partial discharge collection main equipment is consistent with sampling length with the sample rate of partial discharge collection slave unit in the step (2).
Partial discharge collection main equipment uses triggering collection mode in the step (2), and partial discharge collection slave unit is pre- using triggering
Acquisition mode, i.e., the collection preseting length sampled point before triggering, gathered data after triggering, after preseting length data are gathered,
Stop collection.
The data transfer of partial discharge collection slave unit collection to partial discharge collection main equipment is synchronized into place in the step (3)
The detailed process of reason is：
The cable oscillating wave voltage gathered data that main equipment and partial discharge collection slave unit are gathered to partial discharge carries out related operation,
The data maximums for obtaining correspond to the time delay sampling number N of main equipment and the oscillating wave voltage signal of slave unitmax；
Setting sample rate fs, according to formula Δ t=Nmax/fsObtain partial discharge collection main equipment and gather prolonging for slave unit with partial discharge
When △ t, i.e., partial discharge collection main equipment by after △ t with partial discharge gather slave unit synchronous acquisition；
Delete partial discharge and gather main equipment from starting to collect the data that are gathered in the △ t time periods, delete partial discharge collection from setting
It is standby that the data gathered in the △ t time periods are collected from end, realize that partial discharge collection main equipment gathers number with partial discharge collection slave unit
According to synchronization, and length is consistent.
The related operation is specially：
The discretization method of correlation is：It is assumed that N is the element number of partial discharge collection main equipment list entries X, M is office
The element number in collection slave unit sequence Y is put, correlated series is Rxy, and assume to be equal to beyond the index element of sequence X and Y
Zero, i.e.,：
xi=0, i ＜ 0 or i>N
yi=0, i ＜ 0 or i>M
Then export correlated series RxyElement be：
Wherein RxyiRepresent that in correlated series data i-th value, i.e. index are the value of i；XkIndex is k's in representing sequence X
Value；Xk+iRepresent that the index in sequence Y is the value of k+i.
The step (4) obtains the time difference of Partial discharge signal, and goes out the specific method of average partial discharge location distance and be：
1) it is some data segments to divide partial discharge sampled data according to △ t；
2) partial discharge collection main equipment is carried out into related operation with the data of each segmentation in partial discharge collection slave unit, finds out phase
The corresponding array indexing N of maximum of data after the computing of passmax, then Partial discharge signal reaches partial discharge collection main equipment and partial discharge is gathered
The time difference of slave unit is：Δ t'=Nmax/fs, wherein fsIt is sample rate；
3) according to the time difference Δ t' for trying to achieve, average partial discharge location distance is obtained.
The step 3) in obtain the method for average partial discharge location distance and be：
Wherein, l is the length of high-tension cable, and v is spread speed of the Partial discharge signal in cable, and Δ t' reaches for Partial discharge signal
Partial discharge gathers the time difference that main equipment gathers slave unit with partial discharge.
The beneficial effects of the invention are as follows：
1) distance and signaling rate for changing traditional measurement high-tension cable seek signal lag, and the present invention is using high
The time delay that the Similarity Measure of voltage cable oscillating wave voltage goes out between partial discharge collecting device, and greatly reduce afterwards have after filtering
With the noise signal near signal, delay precision is improve.
2) attenuation characteristic due to Partial discharge signal in cable long is present, it is difficult to carry out the cable of long range by traveling wave method
Partial discharge location.By both-end positioning mode, remote cable partial discharge positioning is realized.
3) using high-tension cable oscillating wave voltage as the trigger source of capture card, without external trigger source, device is reduced
Complexity.
Brief description of the drawings
Fig. 1 locally puts both-end positioning system structure schematic diagram for cable of the present invention；
Fig. 2 locally puts both-end localization method flow chart for cable of the present invention；
Fig. 3 is that partial discharge gathers main equipment original waveform figure；
Fig. 4 is that partial discharge gathers slave unit original waveform figure；
Fig. 5 is that partial discharge gathers main equipment original waveform through Bezier bandpass filtering figure；
Fig. 6 is that partial discharge gathers slave unit original waveform through Bezier bandpass filtering figure；
Fig. 7 is related operation oscillogram；
Fig. 8 is the partial enlarged drawing of related operation waveform；
Wherein, 1. partial discharge gathers main equipment, 2. partial discharge collection slave unit, 3. communication module.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, a kind of long range high-tension cable shelf depreciation both-end alignment system, including partial discharge collection main equipment 1,
Partial discharge gathers slave unit 2 and communication module 3；Partial discharge gathers main equipment 1 and realizes communicating with partial discharge collection slave unit 2, partial discharge collection
Main equipment 1 controls partial discharge to gather the acquisition parameter of slave unit 2 by communication module 3；Partial discharge gather main equipment 1 and partial discharge collection from
Equipment 2 is connected to the two ends of power cable to be detected.
As shown in Fig. 2 a kind of long range high-tension cable shelf depreciation both-end localization method, its step includes：
1. partial discharge gathers the preparatory stage, and partial discharge gathers main equipment 1 and realizes communicating with partial discharge collection slave unit 2, partial discharge collection
Main equipment 1 controls partial discharge to gather the acquisition parameter of slave unit 2 by communication module 3, and partial discharge collection slave unit 2 is in and starts collection
State.Partial discharge gathers the oscillating wave voltage and Partial discharge signal that main equipment 1 and partial discharge collection slave unit 2 are gathered on high-tension cable.
2. high-tension cable oscillating wave voltage and Partial discharge signal are gathered, and high-tension cable oscillating wave voltage triggering partial discharge collection master set
For 1 and partial discharge collection slave unit 2, both sample rates are consistent with sampling length, and partial discharge collection slave unit 2 is using triggering pre-acquired side
Formula, i.e., gather certain length sampled point, afterwards triggering collection data before triggering, after certain length data are gathered, stops
Collection.
3. gathered data synchronization process.After the completion of collection, partial discharge gathers slave unit 2 and gathered data is passed through into communication module 3
Transmit to partial discharge collection main equipment 1 and synchronize treatment, calculate partial discharge collection main equipment 1 and partial discharge gather slave unit 2 when
Prolong △ t.
4. the data after synchronization are divided into several segment datas by partial discharge collection main equipment 1 according to △ t, respectively to this several segment data
Partial discharge signal filtering is carried out, the time difference of Partial discharge signal is obtained using related operation, so as to obtain average partial discharge location distance.
Data synchronization processing in step 3, detailed process is：
Phase is carried out with the cable oscillating wave voltage gathered data of partial discharge collection slave unit 2 to partial discharge collection main equipment 1 respectively
Computing is closed, because two-way cable oscillating wave voltage signal has similitude, therefore the data maximums correspondence that related operation is obtained
The time delay sampling number N of two-way voltage signalmax, according to sample rate fs, partial discharge collection main equipment 1 can be obtained and gathered with partial discharge
Time delay the △ t, Δ t=N of slave unit 2max/fs, i.e., partial discharge collection main equipment 1 is by same with partial discharge collection slave unit 2 after △ t
Step collection, deletes partial discharge and gathers main equipment 1 from the data for starting to collect collection in the △ t time periods respectively, deletes partial discharge collection
Slave unit 2 from terminating to collect the data that are gathered in the △ t time periods, so as to realize partial discharge collection main equipment 1 and partial discharge gather from
The gathered data synchronization of equipment 2, and length is consistent.
Related operation in step 3 is specially：
It is assumed that N is the element number of partial discharge collection main equipment list entries X, M is the unit in partial discharge collection slave unit sequence Y
Plain number, correlated series is Rxy, and assume to be equal to zero beyond the index element of sequence X and Y, i.e.,：
xi=0, i ＜ 0 or i>N (1)
yi=0, i ＜ 0 or i>M (2)
Then export correlated series RxyElement be：
Wherein RxyiRepresent that in correlated series data i-th value, i.e. index are the value of i；XkIndex is k's in representing sequence X
Value；Xk+iRepresent that the index in sequence Y is the value of k+i.
Use related algorithm in step 4 obtains the time difference of Partial discharge signal, so that it is determined that partial discharge position, finally tries to achieve flat
Equal partial discharge location distance, detailed process is：
(1) it is several sections to divide partial discharge sampled data according to △ t, carries out same treatment to every section respectively, and processing method is as follows,
As shown in Figure 3 and Figure 4, represent that certain section of partial discharge main equipment and partial discharge gather the original waveform of slave unit respectively.
(2) as shown in Figure 5 and Figure 6, original waveform is carried out into Bezier bandpass filtering respectively, signal sampling rate is
100MHz, arrange parameter is as follows：Lower-cut-off frequency is 5MHz, upper cut-off frequency is 20MHz, Bezier bandpass filter rank
Number is 9.
(3) as shown in fig. 7, filtered waveform is carried out into related operation, data have a maximum after related operation,
Data partial enlargement is as shown in figure 8, maximum correspondence array indexing Nmax=50, sample rate fs=100MHz, therefore signal time
Difference is Δ t'=Nmax/fs, i.e. Δ t'=50/100*106=0.5us.
(4) according to both-end positioning principle, partial discharge location formula is substituted intoAsk partial discharge position.
Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (6)
1. a kind of localization method of use long range high-tension cable shelf depreciation both-end alignment system, it is characterized in that, the system
Including partial discharge collection main equipment, partial discharge collection slave unit and communication module；Partial discharge collection main equipment and partial discharge collection are from setting
The standby two ends for being connected to power cable to be detected；Partial discharge collection main equipment by communication module and partial discharge gather from
Equipment is communicated；
(1) acquisition parameter of partial discharge collecting device is set, sets up logical between partial discharge collection main equipment and partial discharge collection slave unit
Letter；
(2) the oscillating wave voltage triggering partial discharge collection main equipment and partial discharge collection slave unit on high-tension cable, partial discharge collection master set
Standby and partial discharge collection slave unit carries out the collection of oscillating wave voltage and Partial discharge signal on high-tension cable respectively；
(3) after the completion of signal acquisition, the data transfer of partial discharge collection slave unit collection to partial discharge collection main equipment is synchronized
Treatment, calculates the time delay △ t that partial discharge collection main equipment gathers slave unit synchronous data sampling with partial discharge；
(4) the partial discharge data after synchronization are divided into some segment datas by partial discharge collection main equipment according to △ t, respectively to described some
Segment data carries out Partial discharge signal filtering process, and obtains the time difference that Partial discharge signal reaches cable two ends, obtains final product out partial discharge location
Distance, so as to calculate average partial discharge location distance；
The data transfer of partial discharge collection slave unit collection to partial discharge collection main equipment is synchronized into treatment in the step (3)
Detailed process is：
The cable oscillating wave voltage gathered data that main equipment and partial discharge collection slave unit are gathered to partial discharge carries out related operation, obtains
Data maximums correspond to main equipment and slave unit oscillating wave voltage signal time delay sampling number Nmax；
Setting sample rate f s, the time delay that partial discharge collection main equipment gathers slave unit with partial discharge is obtained according to formula Δ t=Nmax/fs
△ t, i.e. partial discharge gather main equipment and gather slave unit synchronous acquisition with partial discharge by after △ t；Delete partial discharge gather main equipment from
Start to collect the data gathered in the △ t time periods, deletion partial discharge collection slave unit is collected in the △ t time periods from end and gathered
Data, realize that partial discharge collection main equipment and partial discharge gather slave unit gathered data synchronous, and length is consistent.
2. a kind of localization method of use long range high-tension cable shelf depreciation both-end alignment system as claimed in claim 1,
It is characterized in that, partial discharge collection main equipment is consistent with sampling length with the sample rate of partial discharge collection slave unit in the step (2).
3. a kind of localization method of use long range high-tension cable shelf depreciation both-end alignment system as claimed in claim 1,
It is characterized in that, partial discharge collection main equipment uses triggering collection mode in the step (2), and partial discharge collection slave unit is pre- using triggering
Acquisition mode, i.e., the collection preseting length sampled point before triggering, gathered data after triggering, after preseting length data are gathered,
Stop collection.
4. a kind of localization method of use long range high-tension cable shelf depreciation both-end alignment system as claimed in claim 1,
It is characterized in that, the related operation is specially：The discretization method of correlation is：It is assumed that N is partial discharge collection main equipment input
The element number of sequence X, M is the element number in partial discharge collection slave unit sequence Y, and correlated series is Rxy, and assumes to exceed sequence
The index element for arranging X and Y is equal to zero, i.e.,：
Xi=0, i ＜ 0 or i>N
Yi=0, i ＜ 0 or i>M
Then the element of output correlated series Rxy is：
Wherein Rxyi represents that in correlated series data i-th value, i.e. index are the value of i；XkIndex is the value of k in representing sequence X；
Yk+iRepresent that the index in sequence Y is the value of k+i.
5. a kind of localization method of use long range high-tension cable shelf depreciation both-end alignment system as claimed in claim 1,
It is characterized in that, the step (4) obtains Partial discharge signal and reaches the time difference at cable two ends, and goes out the tool of average partial discharge location distance
Body method is：
1) it is some data segments to divide partial discharge sampled data according to △ t；
2) partial discharge collection main equipment is carried out into related operation with the data of each segmentation in partial discharge collection slave unit, finds out related fortune
The corresponding array indexing Nmax ' of the maximum of data after calculation, then Partial discharge signal reach partial discharge collection main equipment and partial discharge gather from
The time difference of equipment is：Δ t'=Nmax '/fs, wherein fs are sample rates；
3) according to the time difference Δ t' for trying to achieve, average partial discharge location distance is obtained.
6. a kind of localization method of use long range high-tension cable shelf depreciation both-end alignment system as claimed in claim 1,
It is characterized in that, the step 3) in obtain the method for average partial discharge location distance and be：
Wherein, l is the length of high-tension cable, and v is spread speed of the Partial discharge signal in cable, and Δ t' reaches partial discharge for Partial discharge signal
Collection main equipment gathers the time difference of slave unit with partial discharge.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105389423A (en) * | 2015-10-22 | 2016-03-09 | 云南电网有限责任公司电力科学研究院 | Matlab / Simulink based power cable partial discharge signal propagation simulation method |
| CN105388401A (en) * | 2015-10-26 | 2016-03-09 | 云南电网有限责任公司电力科学研究院 | Novel cable oscillation wave partial discharge detection system |
| EP3388848B1 (en) * | 2017-04-11 | 2020-10-28 | Siemens Aktiengesellschaft | Method, measuring device and measuring system, for determining at least one diagnosis variable in a power distribution network |
| CN108387823A (en) * | 2018-01-30 | 2018-08-10 | 重庆泰山电缆有限公司 | A kind of high voltage cable partial discharge detection method |
| CN109031073A (en) * | 2018-09-04 | 2018-12-18 | 苏州光格设备有限公司 | cable local discharge positioning device and method |
| CN108957267A (en) * | 2018-09-11 | 2018-12-07 | 国网福建省电力有限公司泉州供电公司 | A kind of cable local discharge double-end monitor device and method |
| CN109085481B (en) * | 2018-10-23 | 2021-11-26 | 国网江苏省电力有限公司徐州供电分公司 | Cable partial discharge positioning method based on EWT |
| CN112415347B (en) * | 2020-11-30 | 2022-03-11 | 长沙理工大学 | Partial discharge detection method and system for cable trench tunnel |
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Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: Shandong Electric Power Research Institute Address before: 250002 Wang Yue Road, Ji'nan City, Shandong Province, No. 2000 Patentee before: State Grid Corporation of China Patentee before: Shandong Electric Power Research Institute |
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Effective date of registration: 20220120 Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Address before: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee before: STATE GRID CORPORATION OF CHINA Patentee before: Shandong Electric Power Research Institute |