CN102288883A - 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 handle application technology, be specifically related to a kind of asynchronous both-end power cable wave of oscillation shelf depreciation identification and localization method.
Background technology
The power cable fault location is the important measures that ensure the power grid security economical operation.Because the disguise of power cable line and the limitation of checkout equipment, the trouble spot fast, accurately the location with search 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, the traveling wave method localization of fault need be mated incident wave and reflection wave, because the signal that waveform collects in the transmission course of cable has the reflection wave of incident wave, reflection wave, incident wave, reflection wave and other undesired signal of reflection wave, therefore incident wave and the reflection wave that is produced by same shelf depreciation point is difficult to mate correct; And based on the localization method of energy search algorithm, positioning error is a centimetre-sized, but in local discharge signal travel path, roll over, reflex time, the validity of this localization method is relatively poor; The both-end travelling wave positioning method is the initial row ripple according to the generation of line double-end detection failure, and the mistiming and the velocity of wave that utilize the row ripple to arrive both-end obtain fault distance by calculating, and the major defect of its existence is necessary settling time of a synchronous problem; The 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 that two end positioning devices are accurate to the time synchronized of a microsecond, but because two ends need communication contact and gps system to realize time synchronized, cost of investment is bigger, and when applying to wave of oscillation signal pickup assembly, need to carry out indoor gps signal weak output signal even can't receive indoor.
More than these methods all exist measuring error, limitation big in varying degrees, incident wave and reflection wave coupling difficulty, can not determine defectives such as the exact position of power cable shelf depreciation and cost height, thereby limited its further application in power cable wave of oscillation Partial Discharge Detection field.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art, a kind of asynchronous both-end power cable wave of oscillation shelf depreciation identification and localization method are provided, by two ends different local discharge signal pick-up units is installed at cable to be detected, utilize locating device to detect travelling wave signal time of arrival, by the fault traveling wave positioning master station all temporal informations are handled then, and the temporal information after handling is calculated partial discharge position according to traveling wave method.
A kind of asynchronous both-end power cable wave of oscillation shelf depreciation identification and localization method comprised with the next stage:
(1) preparatory stage: the cable under test two ends are connected with wave of oscillation local discharge signal harvester respectively, and the local discharge signal harvester writes down 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, wave of oscillation local discharge signal harvester is gathered the local discharge signal of the trouble spot generation of cable;
(3) local discharge signal positioning stage: the local discharge signal that collects is carried out Filtering Processing, call the shelf depreciation location algorithm, calculate the position that local discharge signal produces.
Wave of oscillation local discharge signal harvester 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 the level mode.
In stage of the present invention (2), the process that excites the trouble spot to produce local discharge signal is: utilize the high pressure programme-controlled dc power, apply experimental voltage to wave of oscillation local discharge signal harvester, resonant tank is charged, by device inductance and cable under test electric capacity generation resonance, produce damped oscillation voltage at the cable under test two ends, the trouble spot generation local discharge signal that is excited, local discharge signal transmits to the cable two ends.
The signal acquisition process of A of the present invention end harvester is: the local discharge signal that the trouble spot produces is undertaken being divided into two-way after the dividing potential drop by bleeder mechanism and enters A end harvester, wherein one tunnel process filtering directly enters A end harvester, another road direction cable end piece transmission, total reflection takes place at the cable end piece place, to the transmission of A end harvester, after changing signal, the process coupling mechanism enters A end harvester once more.Because waveform can be decayed in the transmission course of cable, scattering, reflection etc., through the transmission of a segment distance, after decay, the waveforms amplitude of local discharge signal correspondence reduces, and width broadens.The amplitude of the reflection wave that finally obtains is littler 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 the trouble spot produces is to the transmission of cable B end harvester, the enough big harvester that starts the B end that then triggers of amplitude when signal, carry out dividing potential drop, coupling processing, and the transmission range of wave recording correspondence.
The signal of A end harvester of the present invention collection is divided into two-way, and wherein one the tunnel is the local discharge signal that the 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 may further comprise the steps:
(1) initialization is carried out Filtering Processing to the signal of local discharge signal harvester collection;
It is right to search pulse, asks the mistiming of single local discharge signal
△ T i : the original waveform and the reflection configuration that write down the side a and b that produces according to the local discharge signal harvester, search with A end in a pair of incident wave and the B end waveform of reflection wave Waveform Matching determine that this group waveform is produced by same partial discharge position, right as a pulse
iDetermine incident wave and reflection wave time corresponding t1 and t2 in the wave file that A end harvester gathers, determine waveform time corresponding t3 in the wave file of B end harvester collection, determine the according to t1, t2 and t3
iThe right displacement of individual pulse is the mistiming of single local discharge signal
△ T i , computing formula is as follows:
；
(3) the m group data of the experimental voltage under this grade are analyzed, obtained m group data
△ T 1 ,
△ T 2 ,
△ T 3 ...,
△ T m
(4) judge whether data under this electric pressure are analyzed and finish, do not finish, analyze next group data, execution in step (2) and (3) successively if analyze; Finish if analyze, then execution in step (5);
(5) mistiming of shelf depreciation under the experiment with computing voltage
△ T: reject the time point that does not meet the demands in the data that the method by assembling class obtains step (3), obtain the n group pulse and be the time corresponding difference
△ T 1 ,
△ T 2 ,
△ T 3 ...,
△ T n , carry out statistical treatment and obtain its mean value
△ T, computing formula is as follows:
(5) time synchronizing: obtain by step (4)
△ TSignal to B end harvester is done translation, obtains the signal of actual transmissions distance, and the time before the translation is not t ', the time t=t ' after the translation+
△ T
(7) determine abort situation by calculating: the total length of cable is L, the length L 1 of the stube cable between harvester and cable top is ignored, the trouble spot is x apart from the length of A end harvester, the transmission range that B end harvester collects the waveform correspondence is L-x, then 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 corresponding waveform of amplitude with time point t place, be the local discharge signal of abort situation generation, by
By calculating partial discharge position:
(8) whether the test data of judging this is analyzed and is finished, and finishes if analyze, and then finishes this circulation; Do not finish if analyze, execution in step (2) then, it is right to continue to search pulse.
The present invention compared with prior art has the following advantages:
(1) the present invention converts realization both-end standard synchronously by the signal of two ends collection, need not to cost to add synchronous device, need not timing, thereby does not exist in the GPS both-end localization method because of the asynchronous timing error that produces;
(2) measuring accuracy height of the present invention, anti-interference are good, anti-noise ability is strong: the deficiency that has overcome single-ended measurement based on the power cable shelf depreciation location algorithm of asynchronous both-end detection, 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 obtains with wave of oscillation signal pickup assembly of the present invention is the stable state continuous wave, energy stabilization, so detect easily, waveform length is limited, and along with the oscillating voltage decay finishes, signals collecting finishes;
(4) localization method of the present invention is simple and convenient, can be applied to pop one's head in, the occasion of Transmit-Receive Unit and processing unit wired connection and wireless connections.Also can grasp its using method fast for non-professional technician;
(5) the present invention not only can be used to move the fault detect of cable, also can be used for the test detection that cable dispatches from the factory;
(6) since measuring accuracy of the present invention to be measured environmental impact little, and can improve measuring accuracy by improving sampling rate, this technical feasibility and applicability are strong.
Description of drawings
Fig. 1 is the operation steps process flow diagram of asynchronous both-end power cable wave of oscillation shelf depreciation identification of the present invention and localization method.
Fig. 2 is the synoptic diagram of wave of oscillation local discharge signal harvester and cable under test connected mode in the method for 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 both-end power cable wave of oscillation shelf depreciation identification of the present invention comprises with the next stage with localization method:
(1) preparatory stage: the cable under test two ends are connected with wave of oscillation local discharge signal harvester respectively, and the local discharge signal harvester writes down 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, wave of oscillation local discharge signal harvester is gathered the local discharge signal of the trouble spot generation of cable;
(3) local discharge signal positioning stage: the local discharge signal that collects is carried out Filtering Processing, call the shelf depreciation location algorithm, calculate the position that local discharge signal produces.
As shown in Figure 2, asynchronous both-end power cable wave of oscillation shelf depreciation identification of the present invention is to be connected wave of oscillation local discharge signal harvester simultaneously by the side a and b at cable under test with localization method, A end harvester is controlled by switch, and B end harvester triggers by the level mode.The process that excites the trouble spot to produce local discharge signal is: utilize the high pressure programme-controlled dc power, apply experimental voltage to wave of oscillation local discharge signal harvester, resonant tank is charged, by device inductance and cable under test electric capacity generation resonance, produce damped oscillation voltage at the cable under test two ends, the trouble spot generation local discharge signal that is excited, local discharge signal transmits to the cable two ends.
The signal acquisition process of A end harvester is: the local discharge signal that the trouble spot produces is undertaken being divided into two-way after the dividing potential drop by bleeder mechanism and enters A end harvester, wherein one tunnel process filtering directly enters A end harvester, another road direction cable end piece transmission, total reflection takes place at the cable end piece place, to the transmission of A end harvester, after changing signal, the process coupling mechanism enters A end harvester once more.Therefore, the signal of A end harvester collection is divided into two-way, and wherein one the tunnel is the local discharge signal that the 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 the trouble spot produces is to the transmission of cable B end harvester, the enough big harvester that starts the B end that then triggers of amplitude 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 the transmission range of wave recording correspondence.
As shown in Figure 3, shelf depreciation location algorithm of the present invention may further comprise the steps:
(1) initialization is carried out Filtering Processing to the signal of local discharge signal harvester collection;
(2) it is right to search pulse, asks the mistiming of single local discharge signal
△ T i : the original waveform and the reflection configuration that write down the side a and b that produces according to the local discharge signal harvester, search with A end in a pair of incident wave and the B end waveform of reflection wave Waveform Matching determine that this group waveform is produced by same partial discharge position, right as a pulse
iDetermine incident wave and reflection wave time corresponding t1 and t2 in the wave file that A end harvester gathers, determine waveform time corresponding t3 in the wave file of B end harvester collection, determine the according to t1, t2 and t3
iThe right displacement of individual pulse is the mistiming of single local discharge signal
△ T i , computing formula is as follows:
；
(3) the m group data of the experimental voltage under this grade are analyzed, obtained m group data
△ T 1 ,
△ T 2 ,
△ T 3 ...,
△ T m
(4) judge whether data under this electric pressure are analyzed and finish, do not finish, analyze next group data, execution in step (2) and (3) successively if analyze; Finish if analyze, then execution in step (5);
(5) mistiming of shelf depreciation under the experiment with computing voltage
△ T: reject the time point that does not meet the demands in the data that the method by assembling class obtains step (3), obtain the n group pulse and be the time corresponding difference
△ T 1 ,
△ T 2 ,
△ T 3 ...,
△ T n , carry out statistical treatment and obtain its mean value
△ T, computing formula is as follows:
；
(6) time synchronizing: obtain by step (4)
△ TSignal to B end harvester is done translation, obtains the signal of actual transmissions distance, and the time before the translation is not t ', the time t=t ' after the translation+
△ T
(7) determine abort situation by calculating: the total length of cable is L, the length L 1 of the stube cable between harvester and cable top is ignored, the trouble spot is x apart from the length of A end harvester, the transmission range that B end harvester collects the waveform correspondence is L-x, then 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 corresponding waveform of amplitude with time point t place, be the local discharge signal of abort situation generation, by:
,
, can get:
, by calculating partial discharge position:
(8) whether the test data of judging this is analyzed and is finished, and finishes if analyze, and then finishes this circulation; Do not finish if analyze, then to return execution in step (2), it is right to continue to search pulse.
Claims (7)
1. an asynchronous both-end power cable wave of oscillation shelf depreciation is discerned and localization method, it is characterized in that, comprises with the next stage:
(1) preparatory stage: the cable under test two ends are connected with wave of oscillation local discharge signal harvester respectively, and the local discharge signal harvester writes down 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, wave of oscillation local discharge signal harvester is gathered the local discharge signal of the trouble spot generation of cable;
(3) local discharge signal positioning stage: the local discharge signal that collects is carried out Filtering Processing, call the shelf depreciation location algorithm, calculate the position that local discharge signal produces.
2. asynchronous both-end power cable wave of oscillation shelf depreciation identification according to claim 1 and localization method is characterized in that, described wave of oscillation local discharge signal harvester comprises A end harvester and B end harvester; Described A end harvester is controlled by switch, and described B end harvester triggers by the level mode.
3. asynchronous both-end power cable wave of oscillation shelf depreciation identification according to claim 1 and 2 and localization method, it is characterized in that, in stage (2), the described process that excites the trouble spot to produce local discharge signal is: utilize the high pressure programme-controlled dc power, apply experimental voltage to wave of oscillation local discharge signal harvester, resonant tank is charged, by device inductance and cable under test electric capacity generation resonance, produce damped oscillation voltage at the cable under test two ends, the trouble spot generation local discharge signal that is excited, local discharge signal transmits to the cable two ends.
4. asynchronous both-end power cable wave of oscillation shelf depreciation identification according to claim 3 and localization method, it is characterized in that, the signal acquisition process of described A end harvester is: the local discharge signal that the trouble spot produces is undertaken being divided into two-way after the dividing potential drop by bleeder mechanism and enters A end harvester, wherein one tunnel process filtering directly enters A end harvester, another road direction cable end piece transmission, total reflection takes place at the cable end piece place, to the transmission of A end harvester, after changing signal, the process coupling mechanism enters A end harvester once more.
5. asynchronous both-end power cable wave of oscillation shelf depreciation identification according to claim 4 and localization method, it is characterized in that, the signal acquisition process of described B end harvester is: the local discharge signal that the trouble spot produces is to the transmission of cable B end harvester, the enough big harvester that starts the B end that then triggers of amplitude when signal, carry out dividing potential drop, coupling processing, and the transmission range of wave recording correspondence.
6. asynchronous both-end power cable wave of oscillation shelf depreciation identification according to claim 5 and localization method, it is characterized in that, the signal of described A end harvester collection is divided into two-way, wherein one the tunnel is the local discharge signal that the trouble spot produces, and another road is the continuous signal that includes incident wave and reflection wave.
7. according to described asynchronous both-end power cable wave of oscillation shelf depreciation identification of one of claim 1 ~ 6 and localization method, it is characterized in that described shelf depreciation location algorithm may further comprise the steps:
(1) initialization is carried out Filtering Processing to the signal of local discharge signal harvester collection;
(2) it is right to search pulse, asks the mistiming of single local discharge signal
△ T i : the original waveform and the reflection configuration that write down the side a and b that produces according to the local discharge signal harvester, search with A end in a pair of incident wave and the B end waveform of reflection wave Waveform Matching determine that this group waveform is produced by same partial discharge position, right as a pulse
iDetermine incident wave and reflection wave time corresponding t1 and t2 in the wave file that A end harvester gathers, determine waveform time corresponding t3 in the wave file of B end harvester collection, determine the according to t1, t2 and t3
iThe right displacement of individual pulse is the mistiming of single local discharge signal
△ T i , computing formula is as follows:
(3) the m group data of the experimental voltage under this grade are analyzed, obtained m group data
△ T 1 ,
△ T 2 ,
△ T 3 ...,
△ T m
(4) judge whether data under this electric pressure are analyzed and finish, do not finish, analyze next group data, execution in step (2) and (3) successively if analyze; Finish if analyze, then execution in step (5);
(5) mistiming of shelf depreciation under the experiment with computing voltage
△ T: reject the time point that does not meet the demands in the data that the method by assembling class obtains step (3), obtain the n group pulse and be the time corresponding difference
△ T 1 ,
△ T 2 ,
△ T 3 ...,
△ T n , carry out statistical treatment and obtain its mean value
△ T, computing formula is as follows:
(6) time synchronizing: obtain by step (4)
△ TSignal to B end harvester is done translation, obtains the signal of actual transmissions distance, and the time before the translation is not t ', the time t=t ' after the translation+
△ T
(7) determine abort situation by calculating: the total length of cable is L, the length L 1 of the stube cable between harvester and cable top is ignored, the trouble spot is x apart from the length of A end harvester, the transmission range that B end harvester collects the waveform correspondence is L-x, then 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 corresponding waveform of amplitude with time point t place, be the local discharge signal of abort situation generation, by:
,
, can get:
, by calculating partial discharge position:
(8) whether the test data of judging this is analyzed and is finished, and finishes if analyze, and then finishes this circulation; Do not finish if analyze, then to return execution in step (2), it is right to continue to search pulse.
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| CN102680854A (en) * | 2012-05-08 | 2012-09-19 | 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 |
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| CN103063992A (en) * | 2012-12-31 | 2013-04-24 | 山东电力集团公司青岛供电公司 | Oscillatory wave system |
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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 |
| CN102680854A (en) * | 2012-05-08 | 2012-09-19 | 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 |
| CN102759686A (en) * | 2012-07-26 | 2012-10-31 | 山东科汇电力自动化有限公司 | Method for locating power cable faults |
| CN103063992A (en) * | 2012-12-31 | 2013-04-24 | 山东电力集团公司青岛供电公司 | Oscillatory wave system |
| 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 |
| CN103344891A (en) * | 2013-07-10 | 2013-10-09 | 苏州光格设备有限公司 | Method and device for locating partial discharge of high voltage cable |
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