CN102288883B - Oscillation wave partial discharge identifying and positioning method for asynchronous double-end power cable - Google Patents
Oscillation wave partial discharge identifying and positioning method for asynchronous double-end power cable Download PDFInfo
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Abstract
The invention discloses an oscillation wave partial discharge identifying and positioning method for an asynchronous double-end power cable. The method disclosed by the invention comprises the following specific steps: respectively installing oscillation wave partial discharge signal acquisition devices at the two ends of the cable; obtaining the voltage and partial discharge capacity signals at the two ends of the detected cable through data acquisition; recording and converting the corresponding data to obtain a waveform file which is needed for failure positioning; calling a partial discharge positioning algorithm to carry out the failure positioning; and computing the accurate position of a failure point generating partial discharge signals. The positioning analysis result obtained by the invention is more accurate; the error rate is small; the wave velocity does not need to be known, thereby reducing the errors caused by computing the wave velocity; the excessive manual intervention is needed; the problems of large data quantity, inaccuracy in positioning and the like because different pulses under the voltage of each experiment are matched are avoided; and the rapid and accurate failure positioning course of the method is beneficial to the timely repair of faulty lines and the reduction of loss caused by power failure.
Description
Technical field
The invention belongs to field of power, relate to power system signal and process application technology, be specifically related to a kind of asynchronous double-end power cable oscillation wave partial discharge identification and localization method.
Background technology
Power cable fault location is the important measures that ensure power grid security economical operation.Due to the disguise of power cable line and the limitation of checkout equipment, the quick, accurate of trouble spot located and searches also imperfection of technology.
At present, the method that applies to power cable fault location both at home and abroad mainly contains following several: traveling wave method localization of fault, energy search algorithm localization of fault, both-end travelling wave positioning method and GPS functional failure travelling wave positioning method etc.Wherein, traveling wave method localization of fault need to be mated with reflection wave incident wave, the signal collecting in the transmitting procedure of cable due to waveform has the reflection wave of incident wave, reflection wave, incident wave, the reflection wave of reflection wave and other undesired signal are therefore correct by incident wave and the very difficult coupling of reflection wave of same shelf depreciation point generation; And localization method based on energy search algorithm, positioning error is centimetre-sized, but in local discharge signal travel path, roll over, reflex time, the validity of this localization method is poor; Both-end travelling wave positioning method is the initial row ripple producing according to line double-end detection failure, and the mistiming and the velocity of wave that utilize row ripple to arrive both-end obtain fault distance by calculating, and the major defect of its existence is necessary settling time of synchronous problem; GPS functional failure travelling wave positioning method is a kind of comparatively desirable Time synchronization technique, utilize the synchronous clock output of GPS, can realize the time synchronized that two end positioning devices are accurate to a microsecond, but because needing communication contact and gps system, two ends realize time synchronized, cost of investment is larger, and when applying to wave of oscillation signal pickup assembly, need carry out indoor, indoor gps signal weak output signal even cannot receive.
These methods all exist measuring error, limitation large in varying degrees above, incident wave mates difficulty with reflection wave, can not determine exact position and the high in cost of production defect of power cable shelf depreciation, thereby limited its further application at power cable oscillation wave partial discharge detection field.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, a kind of asynchronous double-end power cable oscillation wave partial discharge identification and localization method are provided, by different device for detecting partial discharge signals being installed at the two ends of cable to be detected, utilize locating device to detect travelling wave signal time of arrival, then by fault traveling wave positioning master station, all temporal informations are processed, and according to traveling wave method, the temporal information after processing is calculated to partial discharge position.
The identification of asynchronous double-end power cable oscillation wave partial discharge and a localization method, comprised with the next stage:
(1) preparatory stage: cable under test two ends are connected with oscillation wave partial discharge signal pickup assembly respectively, and local discharge signal harvester records original waveform and the reflection configuration that cable produces, and the data message of record is shown in real time;
(2) signal acquisition stage: excite the trouble spot of cable under test to produce local discharge signal, oscillation wave partial discharge signal pickup assembly gathers the local discharge signal of the trouble spot generation of cable;
(3) local discharge signal positioning stage: the local discharge signal collecting is carried out to filtering processing, call shelf depreciation location algorithm, calculate the position that local discharge signal produces.
Oscillation wave partial discharge signal pickup assembly of the present invention comprises A end harvester and B end harvester; A end harvester is controlled by switch, and B end harvester triggers by level mode.
In stage of the present invention (2), the process that excites trouble spot to produce local discharge signal is: utilize high pressure programme-controlled dc power, to oscillation wave partial discharge signal pickup assembly, apply experimental voltage, resonant tank is charged, by device inductance and cable under test electric capacity generation resonance, at cable under test two ends, produce damped oscillation voltage, the trouble spot generation local discharge signal that is excited, local discharge signal transmits to cable two ends.
The signal acquisition process of A of the present invention end harvester is: the local discharge signal that trouble spot produces is undertaken being divided into two-way after dividing potential drop by bleeder mechanism and enters A end harvester, wherein a road directly enters A end harvester after filtering, another road direction cable end piece transmission, at cable end piece place, there is total reflection, again, to the transmission of A end harvester, after through coupling mechanism, signal being changed, enter A end harvester.Because waveform can be decayed in the transmitting procedure of cable, scattering, reflection etc., through the transmission of a segment distance, after decay, the waveforms amplitude that local discharge signal is corresponding reduces, and width broadens.The amplitude of the reflection wave finally obtaining is less than the amplitude of incident wave, frequencies go lower.
The signal acquisition process of B end harvester of the present invention is: the local discharge signal that trouble spot produces is to the transmission of cable B end harvester, the amplitude harvester that enough large triggering startup B holds when signal, carry out dividing potential drop, coupling processing, and transmission range corresponding to wave recording.
The signal of A end harvester of the present invention collection is divided into two-way, and wherein a road is the local discharge signal that trouble spot produces, and another road is the continuous signal that includes incident wave and reflection wave.
Shelf depreciation location algorithm of the present invention comprises the following steps:
(1) initialization, carries out filtering processing to the signal of local discharge signal harvester collection;
Search pulse pair, ask the mistiming △ T of single local discharge signal
i : original waveform and the reflection configuration of the side a and b producing according to local discharge signal harvester record, search B mate with a pair of incident wave in A end and reflection wave and hold waveform to determine that this group waveform is produced by same partial discharge position, as a pulse pair
i; Determine incident wave time t1 and the t2 corresponding with reflection wave in the wave file that A end harvester gathers, determine time t3 corresponding to waveform in the wave file of B end harvester collection, according to t1, t2 and t3, determine the
ithe right displacement of individual pulse is the mistiming △ T of single local discharge signal
i , computing formula is as follows:
；
(3) the m group data analysis to the experimental voltage under this grade, obtains m group data △ T
1, △ T
2, △ T
3..., △ T
m;
(4) judge that whether data under this electric pressure are analyzed completely, if do not analyze completely, analyze next group data, successively execution step (2) and (3); If analyze complete, execution step (5);
(5) the mistiming △ T of shelf depreciation under experiment with computing voltage: reject by assembling in the data that the method for class obtains step (3) time point not meeting the demands, obtaining n group pulse is △ T to the corresponding mistiming
1, △ T
2, △ T
3..., △ T
n, to carry out statistical treatment and obtain its mean value △ T, computing formula is as follows:
；
(5) time synchronizing: the △ T obtaining by step (4) does translation to the signal of B end harvester, obtains the signal of actual transmissions distance, and the time before translation is not t ', time the t=t '+△ T after translation;
(7) by calculative determination abort situation: the total length of cable is L, the length L 1 of the stube cable between harvester and cable top is ignored, trouble spot is x apart from the length of A end harvester, it is L-x that B end harvester collects the transmission range that waveform is corresponding, the transmission range of incident wave is x+L1, the transmission range of reflection wave: 2L-x+L1; In the signal of B end harvester collection, search the waveform corresponding with the amplitude at time point t place, be the local discharge signal that abort situation produces, by
By calculating partial discharge position:
;
(8) it is complete whether the test data that judges this is analyzed, if analyze completely, finishes this circulation; If do not analyze complete, execution step (2), continue to search pulse pair.
The present invention compared with prior art, has the following advantages:
(1) signal that the present invention gathers by two ends converts and realizes both-end standard synchronously, without cost, adds synchronous device, without timing, thereby does not exist in GPS both-end localization method because of the asynchronous timing error producing;
(2) measuring accuracy of the present invention is high, anti-interference good, anti-noise ability is strong: the power cable shelf depreciation location algorithm detecting based on asynchronous double-end has overcome the deficiency of single-ended measurement, real local discharge signal be can determine, the reflection wave of some reflection waves, the interference phenomenons such as reflection wave of other incident wave effectively got rid of;
(3) waveform that the present invention obtains with wave of oscillation signal pickup assembly is stable state continuous wave, energy stabilization, so detect easily, waveform length is limited, and along with oscillating voltage decay is complete, signals collecting finishes;
(4) localization method of the present invention is simple and convenient, can be applied to the occasion of probe, Transmit-Receive Unit and processing unit wired connection and wireless connections.For non-professional technician, also can grasp fast its using method;
(5) the present invention not only can, for the fault detect of operation cable, also can be used for the test detection that cable dispatches from the factory;
(6) due to measuring accuracy of the present invention, to be measured environmental impact little, and can improve measuring accuracy by improving sampling rate, and this technical feasibility and applicability are strong.
Accompanying drawing explanation
Fig. 1 is the operation steps process flow diagram of asynchronous double-end power cable oscillation wave partial discharge identification of the present invention and localization method.
Fig. 2 is the schematic diagram of oscillation wave partial discharge signal pickup assembly and cable under test connected mode in method of the present invention.
Fig. 3 is shelf depreciation identification of the present invention and localization method process flow diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further explained, but the scope of protection of present invention is not limited to this.
Fig. 1 is the operation steps process flow diagram of method of the present invention, and as shown in Figure 1, asynchronous double-end power cable oscillation wave partial discharge identification of the present invention comprises with the next stage with localization method:
(1) preparatory stage: cable under test two ends are connected with oscillation wave partial discharge signal pickup assembly respectively, and local discharge signal harvester records original waveform and the reflection configuration that cable produces, and the data message of record is shown in real time;
(2) signal acquisition stage: excite the trouble spot of cable under test to produce local discharge signal, oscillation wave partial discharge signal pickup assembly gathers the local discharge signal of the trouble spot generation of cable;
(3) local discharge signal positioning stage: the local discharge signal collecting is carried out to filtering processing, call shelf depreciation location algorithm, calculate the position that local discharge signal produces.
As shown in Figure 2, asynchronous double-end power cable oscillation wave partial discharge identification of the present invention is to be connected oscillation wave partial discharge signal pickup assembly by the side a and b at cable under test with localization method simultaneously, A end harvester is controlled by switch, and B end harvester triggers by level mode.The process that excites trouble spot to produce local discharge signal is: utilize high pressure programme-controlled dc power, to oscillation wave partial discharge signal pickup assembly, apply experimental voltage, resonant tank is charged, by device inductance and cable under test electric capacity generation resonance, at cable under test two ends, produce damped oscillation voltage, the trouble spot generation local discharge signal that is excited, local discharge signal transmits to cable two ends.
The signal acquisition process of A end harvester is: the local discharge signal that trouble spot produces is undertaken being divided into two-way after dividing potential drop by bleeder mechanism and enters A end harvester, wherein a road directly enters A end harvester after filtering, another road direction cable end piece transmission, at cable end piece place, there is total reflection, again, to the transmission of A end harvester, after through coupling mechanism, signal being changed, enter A end harvester.Therefore, the signal of A end harvester collection is divided into two-way, and wherein a road is the local discharge signal that trouble spot produces, and another road is the continuous signal that includes incident wave and reflection wave
The signal acquisition process of B end harvester is: the local discharge signal that trouble spot produces is to the transmission of cable B end harvester, the amplitude harvester that enough large triggering startup B holds when signal, carry out dividing potential drop, coupling processing, the data message of record is shown in real time, obtain locating required wave file, and transmission range corresponding to wave recording.
As shown in Figure 3, shelf depreciation location algorithm of the present invention comprises the following steps:
(1) initialization, carries out filtering processing to the signal of local discharge signal harvester collection;
(2) search pulse pair, ask the mistiming △ T of single local discharge signal
i : original waveform and the reflection configuration of the side a and b producing according to local discharge signal harvester record, search B mate with a pair of incident wave in A end and reflection wave and hold waveform to determine that this group waveform is produced by same partial discharge position, as a pulse pair
i; Determine incident wave time t1 and the t2 corresponding with reflection wave in the wave file that A end harvester gathers, determine time t3 corresponding to waveform in the wave file of B end harvester collection, according to t1, t2 and t3, determine the
ithe right displacement of individual pulse is the mistiming △ T of single local discharge signal
i , computing formula is as follows:
(3) the m group data analysis to the experimental voltage under this grade, obtains m group data △ T
1, △ T
2, △ T
3..., △ T
m;
(4) judge that whether data under this electric pressure are analyzed completely, if do not analyze completely, analyze next group data, successively execution step (2) and (3); If analyze complete, execution step (5);
(5) the mistiming △ T of shelf depreciation under experiment with computing voltage: reject by assembling in the data that the method for class obtains step (3) time point not meeting the demands, obtaining n group pulse is △ T to the corresponding mistiming
1, △ T
2, △ T
3..., △ T
n, to carry out statistical treatment and obtain its mean value △ T, computing formula is as follows:
(6) time synchronizing: the △ T obtaining by step (4) does translation to the signal of B end harvester, obtains the signal of actual transmissions distance, and the time before translation is not t ', time the t=t '+△ T after translation;
(7) by calculative determination abort situation: the total length of cable is L, the length L 1 of the stube cable between harvester and cable top is ignored, trouble spot is x apart from the length of A end harvester, it is L-x that B end harvester collects the transmission range that waveform is corresponding, the transmission range of incident wave is x+L1, the transmission range of reflection wave: 2L-x+L1; In the signal of B end harvester collection, search the waveform corresponding with the amplitude at time point t place, be the local discharge signal that abort situation produces, by:
,
, can obtain:
, by calculating partial discharge position:
;
(8) it is complete whether the test data that judges this is analyzed, if analyze completely, finishes this circulation; If do not analyze completely, return to execution step (2), continue to search pulse pair.
Claims (4)
1. the identification of asynchronous double-end power cable oscillation wave partial discharge and a localization method, is characterized in that, comprises with the next stage:
(1) preparatory stage: cable under test two ends are connected with oscillation wave partial discharge signal pickup assembly respectively, and local discharge signal harvester records original waveform and the reflection configuration that cable produces, and the data message of record is shown in real time;
(2) signal acquisition stage: excite the trouble spot of cable under test to produce local discharge signal, oscillation wave partial discharge signal pickup assembly gathers the local discharge signal of the trouble spot generation of cable;
(3) local discharge signal positioning stage: the local discharge signal collecting is carried out to filtering processing, call shelf depreciation location algorithm, calculate the position that local discharge signal produces;
Described oscillation wave partial discharge signal pickup assembly comprises A end harvester and B end harvester; Described A end harvester is controlled by switch, and described B end harvester triggers by level mode;
In the described stage (2), the described process that excites trouble spot to produce local discharge signal is: utilize high pressure programme-controlled dc power, to oscillation wave partial discharge signal pickup assembly, apply experimental voltage, resonant tank is charged, by device inductance and cable under test electric capacity generation resonance, at cable under test two ends, produce damped oscillation voltage, the trouble spot generation local discharge signal that is excited, local discharge signal transmits to cable two ends;
Described local discharge signal harvester records original waveform and the reflection configuration that cable produces, and the data message of record is shown in real time;
Described shelf depreciation location algorithm comprises the following steps:
(1) initialization, carries out filtering processing to the signal of local discharge signal harvester collection;
(2) search pulse pair, ask the mistiming △ T of single local discharge signal
i: the total length of cable is L, the velocity of propagation of shelf depreciation in cable is V, original waveform and the reflection configuration of the side a and b producing according to local discharge signal harvester record, the B searching in B end waveform mate with a pair of incident wave in A end and reflection wave holds original waveform and reflection configuration, determine that this group A end waveform and B end waveform are produced by same partial discharge position, using this organize waveform as a pulse to i; Determine incident wave time t1 and the t2 corresponding with reflection wave in the wave file that A end harvester gathers, determine time t3 corresponding to waveform in the wave file that B end harvester gathers, according to t1, t2 and t3, determine the mistiming △ T that i the right displacement of pulse is single local discharge signal
i, computing formula is as follows:
(3) the m group data analysis to the experimental voltage under this grade, obtains m group data △ T
1, △ T
2, △ T
3..., △ T
m;
(4) judge that whether data under this electric pressure are analyzed completely, if do not analyze completely, analyze next group data, successively execution step (2) and (3); If analyze complete, execution step (5);
(5) the mistiming △ T of shelf depreciation under experiment with computing voltage: reject by assembling in the data that the method for class obtains step (3) time point not meeting the demands, obtaining n group pulse is △ T to the corresponding mistiming
1, △ T
2, △ T
3..., △ T
n, to carry out statistical treatment and obtain its mean value △ T, computing formula is as follows:
(6) time synchronizing: the △ T obtaining by step (4) does translation to the signal of B end harvester, obtains the signal of actual transmissions distance, and the time before translation is not t ', time the t=t '+△ T after translation;
(7) by calculative determination abort situation: the total length of cable is L, the length L 1 of the stube cable between harvester and cable top is ignored, trouble spot is x apart from the length of A end harvester, B end harvester collect transmission range that waveform is corresponding be L ?x, the transmission range of incident wave is x+L1, the transmission range of reflection wave: 2L ?x+L1; In the signal of B end harvester collection, search the waveform corresponding with the amplitude at time point t place, be the local discharge signal that abort situation produces, by:
Can obtain:
By calculating partial discharge position:
(8) it is complete whether the test data that judges this is analyzed, if analyze completely, finishes this circulation; If do not analyze completely, return to execution step (2), continue to search pulse pair.
2. asynchronous double-end power cable oscillation wave partial discharge according to claim 1 is identified and localization method, it is characterized in that, the signal acquisition process of described A end harvester is: the local discharge signal that trouble spot produces is undertaken being divided into two-way after dividing potential drop by bleeder mechanism and enters A end harvester, wherein a road directly enters A end harvester after filtering, another road direction cable end piece transmission, at cable end piece place, there is total reflection, again, to the transmission of A end harvester, after through coupling mechanism, signal being changed, enter A end harvester.
3. asynchronous double-end power cable oscillation wave partial discharge according to claim 2 is identified and localization method, it is characterized in that, the signal acquisition process of described B end harvester is: the local discharge signal that trouble spot produces is to the transmission of cable B end harvester, the amplitude harvester that enough large triggering startup B holds when signal, carry out dividing potential drop, coupling processing, and transmission range corresponding to wave recording.
4. asynchronous double-end power cable oscillation wave partial discharge according to claim 3 is identified and localization method, it is characterized in that, the signal of described A end harvester collection is divided into two-way, wherein a road is the local discharge signal that trouble spot produces, and another road is the continuous signal that includes incident wave and reflection wave.
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| CN102680854B (en) * | 2012-05-08 | 2014-08-20 | 山东康威通信技术股份有限公司 | Online monitoring method for covert faults and joint process defects of power cable |
| CN102759686B (en) * | 2012-07-26 | 2015-04-01 | 山东科汇电力自动化股份有限公司 | Method for locating power cable faults |
| CN103063992B (en) * | 2012-12-31 | 2015-08-26 | 山东电力集团公司青岛供电公司 | Oscillatory wave system |
| CN103344891B (en) * | 2013-07-10 | 2017-02-15 | 苏州光格设备有限公司 | Method and device for locating partial discharge of high voltage cable |
| CN103558514B (en) * | 2013-10-10 | 2016-04-27 | 广东电网公司惠州供电局 | Based on double-end cable oscillation wave partial discharge positioning system and the method for impulses injection |
| CN103823157A (en) * | 2014-02-17 | 2014-05-28 | 上海交通大学 | GPS synchronous timing-based XLPE cable partial discharge positioning device |
| CN104569769A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Power cable partial discharge simulation system and testing method |
| CN104678266B (en) * | 2015-02-05 | 2017-06-20 | 国家电网公司 | A kind of long range high-tension cable shelf depreciation both-end alignment system and method |
| CN105988066A (en) * | 2015-02-09 | 2016-10-05 | 华北电力大学（保定） | Double-end partial discharging positioning method of long-distance cable based on correction pulses |
| CN105093083B (en) * | 2015-08-31 | 2018-03-27 | 广州供电局有限公司 | Cable local discharge signal framing device and localization 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 |
| CN106546886B (en) * | 2016-11-03 | 2018-06-15 | 云南电网有限责任公司普洱供电局 | A kind of cable oscillation wave Partial discharge signal feature extracting method |
| CN106771861B (en) * | 2016-12-08 | 2019-01-25 | 中国矿业大学 | Complex electric network Fault Locating Method based on wide area traveling wave energy and time difference |
| 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 |
| CN109738763A (en) * | 2019-02-28 | 2019-05-10 | 国网湖北省电力有限公司黄石供电公司 | A kind of medium-voltage distribution cable short trouble localization method based on wavelet package transforms |
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