CN116679167A - Partial discharge positioning method, equipment and storage medium for cable - Google Patents
Partial discharge positioning method, equipment and storage medium for cable Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a cable partial discharge positioning method, equipment and a storage medium, wherein the method comprises the following steps: extracting a plurality of original wave crest signals from the partial discharge signals of the cable; removing interference in a plurality of original peak signals to obtain a target peak signal; identifying two target peak signals matched with each other as matched peak signals; calculating candidate discharge positions of the partial discharge sources in the cable according to the time difference between the paired wave crest signals; and clustering the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable. For the repeated partial discharge signals of a single partial discharge source, stable positions can be clustered after interference and preliminary positioning are eliminated, the number of preset partial discharge sources is not relied on, the adaptability to the partial discharge sources generated under different conditions is high, the influence caused by time errors and randomness can be restrained, and the accuracy of positioning the partial discharge sources is improved.
Description
Technical Field
The present invention relates to the field of electric power technology, and in particular, to a method, an apparatus, and a storage medium for locating partial discharge of a cable.
Background
The electric energy is transmitted to each place through the cable in the electric wire netting, and the cable is widely laid in each region, and the ring that the cable was located is comparatively complicated, and the surface of cable appears corroding, is gnawed by the animal etc. condition easily, causes the insulating layer of cable impaired, produces partial discharge's condition, probably causes the electric wire netting trouble.
Therefore, the inspection of partial discharge of a cable is a conventional inspection item for cable maintenance, and positioning of the partial discharge source is advantageous for quickly finding insulation faults while avoiding inspection of the entire cable.
At present, the position of the partial discharge source is calculated according to the time difference of the partial discharge signals mainly by a traveling wave ranging positioning method, but the time point determined by a single pair of paired signals has large error and strong randomness, and meanwhile, the positioning accuracy is affected by an interference signal and noise data.
Disclosure of Invention
The invention provides a partial discharge positioning method, equipment and a storage medium for a cable, which are used for solving the problem of how to improve the accuracy of checking the position of a partial discharge source on the cable.
According to an aspect of the present invention, there is provided a partial discharge positioning method of a cable, including:
extracting a plurality of original wave crest signals from the partial discharge signals of the cable;
Removing interference in a plurality of original crest signals to obtain a target crest signal;
identifying two matched target peak signals as matched peak signals;
calculating candidate discharge positions of the partial discharge sources in the cable according to the time difference between the paired peak signals;
and clustering the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable.
Optionally, extracting a plurality of original peak signals from the partial discharge signal of the cable comprises:
generating an oscillatory wave signal to the cable;
if the local discharge source exists in the cable according to the oscillating wave signal, collecting a local discharge signal from the local discharge source;
and extracting each original crest signal from the partial discharge signal.
Optionally, the removing interference in the plurality of original peak signals to obtain a target peak signal includes:
screening out the original peak signals with the largest amplitude from a plurality of the original peak signals;
multiplying the absolute value of the original peak signal with the maximum amplitude with a preset amplitude coefficient to obtain an amplitude threshold;
if the original peak signal is smaller than the amplitude threshold, deleting the original peak signal;
If the original peak signal is greater than or equal to the amplitude threshold, marking the original peak signal as a candidate peak signal;
calculating a plurality of time periods of back and forth reflection in the cable for each of the candidate peak signals;
searching other candidate peak signals with reflection interference on the current candidate peak signal in a plurality of time periods;
if other candidate peak signals are found, deleting the other candidate peak signals;
marking the rest candidate peak signals as target peak signals.
Optionally, the time period is:
wherein t is i For the i-th time point of the candidate peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s The sampling frequency is that beta is a positive integer;
and the other candidate peak signals with reflection interference on the current candidate peak signals meet the following conditions:
S Ri *S Rj ＞0
|S Ri |＞|S Rj |
wherein S is Ri For the ith candidate peak signal, S Rj And j-th candidate peak signal.
Optionally, the identifying two target peak signals that match each other as paired peak signals includes:
calculating a pairing time range for each target peak signal;
Searching other target peak signals matched with the current target peak signal in the time range;
and marking the current target peak signal and the matched other target peak signals as matched peak signals.
Optionally, the time range is:
wherein t is Pi For the i-th time point of the target peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s Is sampled byA frequency;
the other target peak signals matched with the current target peak signal meet the following conditions:
S Pi *S Pj ＞0
|S Pi |＞|S Pj |＞c|S Pi |
wherein S is Pi For the ith target peak signal, S Pj And c is a pairing coefficient for the j-th target peak signal.
Optionally, the calculating the candidate discharge position of the partial discharge source in the cable according to the time difference between the paired peak signals includes:
substituting the time difference between the paired peak signals into the following formula to calculate the candidate discharge positions of the partial discharge sources in the cable:
wherein X is the candidate discharge position of the local discharge point source in the cable, L is the length of the cable, t Pi T is the time point at which the ith paired peak signal is located pj And v is the propagation speed of the partial discharge signal at the time point where the j-th paired peak signal is located.
Optionally, the clustering the candidate discharge positions to obtain target discharge positions of the partial discharge source in the cable includes:
sequencing the candidate discharge positions to obtain a position sequence;
dividing the position sequence into a plurality of data sets, wherein the difference value between two adjacent candidate discharge positions in the same data set is smaller than or equal to a preset first threshold value, and the difference value between the candidate discharge positions positioned at the boundaries of the two adjacent data sets is larger than the preset first threshold value;
if the number of the candidate discharge positions in the data set is smaller than or equal to a preset second threshold value, deleting the data set;
and if the number of the candidate discharge positions in the data set is larger than a preset second threshold value, calculating the average value of the candidate discharge positions in the data set, and obtaining the target discharge position of the partial discharge source in the cable.
According to another aspect of the present invention, there is provided a partial discharge positioning apparatus for a cable, comprising:
the original wave crest signal extraction module is used for extracting a plurality of original wave crest signals from the partial discharge signals of the cable;
The target peak signal screening module is used for removing interference from a plurality of original peak signals to obtain target peak signals;
the matched peak signal identification module is used for identifying two matched target peak signals as matched peak signals;
the candidate discharge position calculation module is used for calculating the candidate discharge position of the partial discharge source in the cable according to the time difference between the paired peak signals;
and the target discharge position clustering module is used for clustering the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable.
Optionally, the original peak signal extraction module is further configured to:
generating an oscillatory wave signal to the cable;
if the local discharge source exists in the cable according to the oscillating wave signal, collecting a local discharge signal from the local discharge source;
and extracting each original crest signal from the partial discharge signal.
Optionally, the target peak signal screening module is further configured to:
screening out the original peak signals with the largest amplitude from a plurality of the original peak signals;
multiplying the absolute value of the original peak signal with the maximum amplitude with a preset amplitude coefficient to obtain an amplitude threshold;
If the original peak signal is smaller than the amplitude threshold, deleting the original peak signal;
if the original peak signal is greater than or equal to the amplitude threshold, marking the original peak signal as a candidate peak signal;
calculating a plurality of time periods of back and forth reflection in the cable for each of the candidate peak signals;
searching other candidate peak signals with reflection interference on the current candidate peak signal in a plurality of time periods;
if other candidate peak signals are found, deleting the other candidate peak signals;
marking the rest candidate peak signals as target peak signals.
Optionally, the time period is:
wherein t is i For the i-th time point of the candidate peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s The sampling frequency is that beta is a positive integer;
and the other candidate peak signals with reflection interference on the current candidate peak signals meet the following conditions:
S Ri *S Rj ＞0
|S Ri |＞|S Rj |
wherein S is Ri For the ith candidate peak signal, S Rj And j-th candidate peak signal.
Optionally, the paired peak signal identification module is further configured to:
Calculating a pairing time range for each target peak signal;
searching other target peak signals matched with the current target peak signal in the time range;
and marking the current target peak signal and the matched other target peak signals as matched peak signals.
Optionally, the time range is:
wherein t is Pi For the i-th time point of the target peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s Is the frequency of sampling;
the other target peak signals matched with the current target peak signal meet the following conditions:
S Pi *S Pj ＞0
|S Pi |＞|S Pj |＞c|S Pi |
wherein S is Pi For the ith target peak signal, S Pj And c is a pairing coefficient for the j-th target peak signal.
Optionally, the candidate discharge location calculation module is further configured to:
substituting the time difference between the paired peak signals into the following formula to calculate the candidate discharge positions of the partial discharge sources in the cable:
wherein X is the candidate discharge position of the local discharge point source in the cable, L is the length of the cable, t Pi T is the time point at which the ith paired peak signal is located pj And v is the propagation speed of the partial discharge signal at the time point where the j-th paired peak signal is located.
Optionally, the target discharge position clustering module is further configured to:
sequencing the candidate discharge positions to obtain a position sequence;
dividing the position sequence into a plurality of data sets, wherein the difference value between two adjacent candidate discharge positions in the same data set is smaller than or equal to a preset first threshold value, and the difference value between the candidate discharge positions positioned at the boundaries of the two adjacent data sets is larger than the preset first threshold value;
if the number of the candidate discharge positions in the data set is smaller than or equal to a preset second threshold value, deleting the data set;
and if the number of the candidate discharge positions in the data set is larger than a preset second threshold value, calculating the average value of the candidate discharge positions in the data set, and obtaining the target discharge position of the partial discharge source in the cable.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of localized discharge positioning of a cable according to any of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing a computer program for causing a processor to execute the method for positioning partial discharge of a cable according to any embodiment of the present invention.
In this embodiment, a plurality of original peak signals are extracted from the partial discharge signal of the cable; removing interference in a plurality of original peak signals to obtain a target peak signal; identifying two target peak signals matched with each other as matched peak signals; calculating candidate discharge positions of the partial discharge sources in the cable according to the time difference between the paired wave crest signals; and clustering the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable. For the repeated partial discharge signals of a single partial discharge source, stable positions can be clustered after interference and preliminary positioning are eliminated, the number of preset partial discharge sources is not relied on, the adaptability to the partial discharge sources generated under different conditions is high, the influence caused by time errors and randomness can be restrained, and the accuracy of positioning the partial discharge sources is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for positioning a partial discharge of a cable according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit for collecting partial discharge signals from a cable according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a partial discharge positioning device for a cable according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to a third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a method for positioning a partial discharge of a cable according to an embodiment of the present invention, where the method may be performed by a partial discharge positioning device of the cable, where the partial discharge positioning device of the cable may be implemented in hardware and/or software, and where the partial discharge positioning device of the cable may be configured in an electronic device. As shown in fig. 1, the method includes:
Step 101, extracting a plurality of original peak signals from the partial discharge signals of the cable.
In this embodiment, the cable may be monitored, and if the partial discharge signal is detected in the cable, a plurality of original peak signals may be extracted from the partial discharge signal, where the original peak signals are signals at a peak.
In a specific implementation, the collector can be deployed on the cable, as shown in fig. 2, one end of the cable E is grounded, the other end of the cable E is connected with the voltage divider VD and the inductor L respectively, the voltage divider VD is connected with the impedance Z and the collector Q respectively, one end of the collector Q is connected with the voltage divider VD, the other end of the collector Q is connected with the impedance Z, the impedance Z is grounded, the inductor L is connected with the switch K and the current limiting resistor R respectively, the switch K is grounded, the current limiting resistor R is connected with the direct current power source S, and the direct current power source S is grounded.
Further, the voltage divider VD includes two branches, a first capacitor C1 and a second capacitor C2 are serially connected to one of the branches near the cable E, a first resistor R1 and a second resistor R2 are serially connected to the other branch far away from the cable E, the second capacitor C2 and the second resistor R2 are both connected to the impedance Z, and the collector Q is connected to the intersection point between the first resistor R1 and the second resistor R2, and the intersection point between the first capacitor C1 and the second capacitor C2.
In general, the switch K is closed instantaneously, and thus, the value in half a period is set to 0 from the first value of the partial discharge signal.
In this embodiment, the collector may be driven to generate an oscillating wave signal for the cable, and if the local discharge source is detected to exist in the cable according to the oscillating wave signal, the collector may be driven to collect the local discharge signals for the local discharge sources, and each local discharge source may generate multiple discharge phenomena, so as to generate a large number of local discharge signals.
Extracting each original peak signal S from partial discharge signals by using a sliding window, a front/rear preferential and other peak detection algorithm K Wherein K is a positive integer representing the number of original peak signals, each original peak signal S K All carry information such as amplitude, time point, etc.
And 102, removing interference from the plurality of original peak signals to obtain a target peak signal.
Because various interferences such as environmental interference and reflection interference exist in the cable, the corresponding interferences can be removed from the plurality of original peak signals according to the interference condition, so that a cleaner target peak signal is obtained, and the quality of the target peak signal is improved.
In one embodiment of the present invention, step 102 may include the steps of:
step 1021, screening out the original peak signals with the largest amplitude from the plurality of original peak signals.
In the present embodiment, the peak signals S can be obtained from a plurality of sources K Is compared with the amplitude of the wave crest signal S, and the original wave crest signal S with the maximum amplitude is screened out max 。
Step 1022, multiplying the absolute value of the original peak signal with the largest amplitude with a preset amplitude coefficient to obtain an amplitude threshold.
The original peak signal S with the maximum amplitude max Is multiplied by a preset amplitude coefficient a, the product is recorded as an amplitude threshold a|s max I, a plurality of original peak signals S K Amplitude and amplitude threshold a|s of (a) max And comparing.
Step 1023, if the original peak signal is smaller than the amplitude threshold, deleting the original peak signal.
Step 1024, if the original peak signal is greater than or equal to the amplitude threshold, marking the original peak signal as a candidate peak signal.
If a certain original peak signal is smaller than the amplitude threshold, i.e. s i ＜a|s max I, i epsilon (1-K), the original peak signal belongs to white noise generated by environmental interference, and at the moment, the original peak signal can be deleted to remove the environmental interference.
If a certain original peak signal is greater than or equal to the amplitude threshold, i.e. s i ≥a|s max I, i e (1-K), the original peak signal can be marked as a candidate peak signal S R Wherein R is a positive integer representing the number of candidate peak signals waiting for the candidate peak signal S R Further removing the interference.
Step 1025 calculates a plurality of time periods of back and forth reflection in the cable for each candidate peak signal.
A single partial discharge signal reaches the head end of the cable, is reflected and then reaches the tail end of the cable, and is then reflected to the head end of the cable, and the partial discharge signal reflected back and forth by the cable is not referenced when positioning the partial discharge source, so that such partial discharge signal can be regarded as an interference signal.
In the present embodiment, reference may be made to the respective candidate peak signals S R Reads candidate peak signals S one by one R For each candidate peak signal S R A plurality of time periods of back and forth reflections in the cable are calculated.
Illustratively, the distance between the partial discharge signal and the first arrival at the head end of the cable is an integer multiple of 2L, where L is the length of the cable, and the time period is:
wherein t is i For the ith candidate peak signal S Ri (i.e. the current candidate peak signal) at the time point, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s For the sampling frequency, β is a positive integer, and the value of β determines the number of time periods, typically β=1, 2,3, i.e. three consecutive time periods are taken to check whether there is reflection interference.
Step 1026, searching for other candidate peak signals having reflection interference to the current candidate peak signal in a plurality of time periods.
Step 1027, if other candidate peak signals are found, deleting the other candidate peak signals.
Step 1028, marking the remaining candidate peak signals as target peak signals.
In this embodiment, each candidate peak signal may be traversed, and other candidate peak signals having reflection interference on the current candidate peak signal may be searched for sequentially in a plurality of time periods.
Illustratively, other candidate peak signals for which there is reflection interference with the current candidate peak signal meet the following condition:
S Ri *S Rj ＞0 i，j∈(1～R)
|S Ri |＞|S Rj |
wherein S is Ri For the ith candidate peak signal, S Rj For the j-th candidate peak signal, then S Rj For S RI There is a reflected disturbance.
For other candidate peak signals with reflection interference, the other candidate peak signals may be deleted, for example, set to 0, and the reflection interference is removed for the current candidate peak signal.
Traversing all candidate wave crest signals S R Thereafter, the remaining candidate peak signals S R Marked as target peak signal S P Wherein P is a positive integer representing the number of candidate target peak signals.
Step 103, identifying two matched target peak signals as matched peak signals.
In practical application, the partial discharge source generates a partial discharge signal, and the partial discharge signal directly from the partial discharge source to the collector (i.e. the cable head end) is recorded as S pi，1 The partial discharge signal reflected by the tail end of the cable and then reaching the collector is recorded as S pi，2 ，S pi，1 And S is pi，2 Defined as a pair of paired partial discharge signals, from which the position of the partial discharge source in the cable can be calculated from the time difference between the paired partial discharge signals.
Then, in the present embodiment, two target peak signals that match each other may be identified as paired peak signals, that is, one of the paired peak signals is a partial discharge signal obtained after reflection of the other target peak signal.
In one embodiment of the present invention, step 103 may include the steps of:
step 1031, calculating a pairing time range for each target peak signal.
In the present embodiment, reference may be made to the respective target peak signals S P Reads the target peak signal S one by one P For each target peak signal S P The time range of the pairing is calculated.
Illustratively, the time ranges are:
wherein t is Pi For the ith target peak signal S Pi At the point in time (i.e., the current target peak signal), L is the length of the cable, v is the propagation speed of the partial discharge signal, f s For sampling frequency。
Step 1032, searching for other target peak signals matching the current target peak signal in the time range.
And 1033, marking the current target peak signal and other matched target peak signals as matched peak signals.
In this embodiment, each target peak signal may be traversed, other candidate peak signals having reflection interference on the current candidate peak signal may be searched in a corresponding time range, and if found, the current target peak signal and the matched other target peak signals are marked as paired peak signals, so as to complete pairing.
Illustratively, other target peak signals that match the current target peak signal meet the following conditions:
S Pi *S Pj ＞0 i，j∈(1～P)
|S Pi |＞|S Pj |＞c|S Pi |
wherein S is Pi For the ith target peak signal, S Pj For the j-th target peak signal, c is the pairing coefficient, S Pj And S is equal to Pi Is a paired peak signal.
And 104, calculating the candidate discharge positions of the partial discharge sources in the cable according to the time difference between the paired peak signals.
In this embodiment, the time difference between the paired peak signals (i.e., the two target peak signals) may be calculated, and the position of the partial discharge source in the cable is calculated according to the time difference and is recorded as the candidate discharge position.
In a specific implementation, the time difference between the paired peak signals can be substituted into the following formula to calculate the candidate discharge positions of the partial discharge sources in the cable:
wherein X is the candidate discharge position of the local discharge point source in the cable, L is the length of the cable, t Pi For the time at which the ith target peak signal is locatedIntermediate points, t pj V is the propagation speed of the partial discharge signal at the time point where the jth target peak signal is located.
And 105, clustering the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable.
In practical application, multiple candidate discharge positions are obtained by multiple detection, and have certain fluctuation to form a scatter diagram S X Therefore, the scatter diagram S can be obtained X The candidate discharge positions in the cable are clustered, the fluctuation interference is reduced, and the target discharge positions of the partial discharge source in the cable are obtained, so that the accuracy of the target discharge positions is improved.
In one embodiment of the present invention, step 105 may include the steps of:
step 1051, sorting the candidate discharge positions to obtain a position sequence.
In the present embodiment, the scattergrams S may be aligned in order from small to large X The plurality of candidate discharge positions in the sequence are ordered to obtain a position sequence.
Step 1052, slicing the sequence of positions into multiple data sets.
In this embodiment, the position sequence may be segmented to obtain a plurality of data sets, where a difference between two adjacent candidate discharge positions in the same data set is less than or equal to a preset first threshold (e.g., 0.5 meters), and a difference between candidate discharge positions at boundaries of two adjacent data sets (i.e., a last-ranked candidate discharge position in a previous data set and a first-ranked candidate discharge position in a subsequent data set) is greater than a preset first threshold (e.g., 0.5 meters).
In a specific implementation, step 1052 may further include the steps of:
step 10521, determining a first variable and a second variable, wherein the first variable is the first candidate discharge position in the position sequence, and the second variable is the candidate discharge position in the position sequence sequenced after the first variable.
Step 10522, calculating a difference between the first variable and the second variable.
Step 10523, if the difference is less than or equal to the preset first threshold, writing the second variable into the data set where the first variable is located.
And 10524, if the difference is greater than the preset first threshold, generating a new data set, and writing the second variable into the new data set.
Step 10525, determine whether there is a candidate discharge position located after the second variable in the position sequence, if so, execute step 10526, if not, end.
Step 10526, setting the candidate discharge positions of the second variable as the first variable, setting the candidate discharge positions ordered after the second variable in the position sequence as the second variable, and returning to step 10521.
Step 1053, deleting the data set if the number of candidate discharge positions in the data set is less than or equal to a preset second threshold.
In the present embodiment, the number of candidate discharge positions may be counted for each data group.
If the number of candidate discharge positions in a certain data set is smaller than or equal to a preset second threshold (e.g. 2), which indicates that the number of the data set is smaller and has no clustering meaning, the data set can be deleted.
And 1054, if the number of the candidate discharge positions in the data set is greater than a preset second threshold, calculating an average value of the candidate discharge positions in the data set, and obtaining the target discharge position of the partial discharge source in the cable.
If the number of the candidate discharge positions in a certain data set is greater than a preset second threshold (e.g. 2), which indicates that the number of the data set is greater and has clustering significance, an average value of each candidate discharge position in the data set can be calculated and used as a target discharge position of a partial discharge source in the cable.
In this embodiment, a plurality of original peak signals are extracted from the partial discharge signal of the cable; removing interference in a plurality of original peak signals to obtain a target peak signal; identifying two target peak signals matched with each other as matched peak signals; calculating candidate discharge positions of the partial discharge sources in the cable according to the time difference between the paired wave crest signals; and clustering the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable. For the repeated partial discharge signals of a single partial discharge source, stable positions can be clustered after interference and preliminary positioning are eliminated, the number of preset partial discharge sources is not relied on, the adaptability to the partial discharge sources generated under different conditions is high, the influence caused by time errors and randomness can be restrained, and the accuracy of positioning the partial discharge sources is improved.
Example two
Fig. 3 is a schematic structural diagram of a partial discharge positioning device for a cable according to a second embodiment of the present invention.
As shown in fig. 3, the apparatus includes:
an original peak signal extraction module 301, configured to extract a plurality of original peak signals from the partial discharge signal of the cable;
the target peak signal screening module 302 is configured to remove interference from a plurality of the original peak signals to obtain a target peak signal;
a paired peak signal identifying module 303, configured to identify two target peak signals that are matched with each other, as paired peak signals;
a candidate discharge position calculation module 304, configured to calculate a candidate discharge position of a partial discharge source in the cable according to a time difference between the paired peak signals;
and the target discharge position clustering module 305 is configured to cluster the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable.
In one embodiment of the present invention, the original peak signal extraction module 301 is further configured to:
generating an oscillatory wave signal to the cable;
if the local discharge source exists in the cable according to the oscillating wave signal, collecting a local discharge signal from the local discharge source;
And extracting each original crest signal from the partial discharge signal.
In one embodiment of the present invention, the target peak signal screening module 302 is further configured to:
screening out the original peak signals with the largest amplitude from a plurality of the original peak signals;
multiplying the absolute value of the original peak signal with the maximum amplitude with a preset amplitude coefficient to obtain an amplitude threshold;
if the original peak signal is smaller than the amplitude threshold, deleting the original peak signal;
if the original peak signal is greater than or equal to the amplitude threshold, marking the original peak signal as a candidate peak signal;
calculating a plurality of time periods of back and forth reflection in the cable for each of the candidate peak signals;
searching other candidate peak signals with reflection interference on the current candidate peak signal in a plurality of time periods;
if other candidate peak signals are found, deleting the other candidate peak signals;
marking the rest candidate peak signals as target peak signals.
Illustratively, the time period is:
wherein t is i For the i-th time point of the candidate peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s The sampling frequency is that beta is a positive integer;
and the other candidate peak signals with reflection interference on the current candidate peak signals meet the following conditions:
S Ri *S Rj ＞0
|S Ri |＞|S Rj |
wherein S is Ri For the ith candidate peak signal, S Rj For the j-th said candidateA peak signal.
In one embodiment of the present invention, the paired peak signal identification module 303 is further configured to:
calculating a pairing time range for each target peak signal;
searching other target peak signals matched with the current target peak signal in the time range;
and marking the current target peak signal and the matched other target peak signals as matched peak signals.
Illustratively, the time range is:
wherein t is Pi For the i-th time point of the target peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s Is the frequency of sampling;
the other target peak signals matched with the current target peak signal meet the following conditions:
S PI *S Pj ＞0
|S Pi |＞|S Pj |＞c|S Pi |
wherein S is Pi For the ith target peak signal, S Pj And c is a pairing coefficient for the j-th target peak signal.
In one embodiment of the present invention, the candidate discharge location calculation module 304 is further configured to:
Substituting the time difference between the paired peak signals into the following formula to calculate the candidate discharge positions of the partial discharge sources in the cable:
wherein X is the candidate discharge position of the local discharge point source in the cable, L is theLength of cable t Pi T is the time point at which the ith paired peak signal is located pj And v is the propagation speed of the partial discharge signal at the time point where the j-th paired peak signal is located.
In one embodiment of the present invention, the target discharge location clustering module 305 is further configured to:
sequencing the candidate discharge positions to obtain a position sequence;
dividing the position sequence into a plurality of data sets, wherein the difference value between two adjacent candidate discharge positions in the same data set is smaller than or equal to a preset first threshold value, and the difference value between the candidate discharge positions positioned at the boundaries of the two adjacent data sets is larger than the preset first threshold value;
if the number of the candidate discharge positions in the data set is smaller than or equal to a preset second threshold value, deleting the data set;
and if the number of the candidate discharge positions in the data set is larger than a preset second threshold value, calculating the average value of the candidate discharge positions in the data set, and obtaining the target discharge position of the partial discharge source in the cable.
The partial discharge positioning device for the cable provided by the embodiment of the invention can execute the partial discharge positioning method for the cable provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the partial discharge positioning method for the cable.
Example III
Fig. 4 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 4, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the partial discharge positioning method of the cable.
In some embodiments, the cable partial discharge positioning method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the cable partial discharge positioning method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the cable partial discharge positioning method in any other suitable way (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
Example IV
Embodiments of the present invention also provide a computer program product comprising a computer program which, when executed by a processor, implements a method of partial discharge positioning of a cable as provided by any of the embodiments of the present invention.
Computer program product in the implementation, the computer program code for carrying out operations of the present invention may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of localized discharge positioning of a cable, comprising:
extracting a plurality of original wave crest signals from the partial discharge signals of the cable;
removing interference in a plurality of original crest signals to obtain a target crest signal;
identifying two matched target peak signals as matched peak signals;
calculating candidate discharge positions of the partial discharge sources in the cable according to the time difference between the paired peak signals;
And clustering the candidate discharge positions to obtain target discharge positions of the partial discharge sources in the cable.
2. The method of claim 1, wherein extracting a plurality of raw peak signals from the partial discharge signal of the cable comprises:
generating an oscillatory wave signal to the cable;
if the local discharge source exists in the cable according to the oscillating wave signal, collecting a local discharge signal from the local discharge source;
and extracting each original crest signal from the partial discharge signal.
3. The method of claim 1, wherein said removing interference from said plurality of said original peak signals to obtain a target peak signal comprises:
screening out the original peak signals with the largest amplitude from a plurality of the original peak signals;
multiplying the absolute value of the original peak signal with the maximum amplitude with a preset amplitude coefficient to obtain an amplitude threshold;
if the original peak signal is smaller than the amplitude threshold, deleting the original peak signal;
if the original peak signal is greater than or equal to the amplitude threshold, marking the original peak signal as a candidate peak signal;
Calculating a plurality of time periods of back and forth reflection in the cable for each of the candidate peak signals;
searching other candidate peak signals with reflection interference on the current candidate peak signal in a plurality of time periods;
if other candidate peak signals are found, deleting the other candidate peak signals;
marking the rest candidate peak signals as target peak signals.
4. The method of claim 3, wherein the step of,
the time period is as follows:
wherein t is i For the i-th time point of the candidate peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s The sampling frequency is that beta is a positive integer;
and the other candidate peak signals with reflection interference on the current candidate peak signals meet the following conditions:
S Ri *S Rj >0
|S Ri |>|S Rj |
wherein S is Ri For the ith candidate peak signal, S Rj And j-th candidate peak signal.
5. The method according to claim 1, wherein said identifying two of said target peak signals that match each other as a paired peak signal comprises:
calculating a pairing time range for each target peak signal;
Searching other target peak signals matched with the current target peak signal in the time range;
and marking the current target peak signal and the matched other target peak signals as matched peak signals.
6. The method of claim 5, wherein the step of determining the position of the probe is performed,
the time range is as follows:
wherein t is Pi For the i-th time point of the target peak signal, L is the length of the cable, v is the propagation speed of the partial discharge signal, f s Is the frequency of sampling;
the other target peak signals matched with the current target peak signal meet the following conditions:
S Pi *S Pj >0
|S Pi |>|S Pj |>c|S Pi |
wherein S is Pi For the ith target peak signal, S Pj And c is a pairing coefficient for the j-th target peak signal.
7. The method of claim 1, wherein said calculating candidate discharge locations for a partial discharge source in the cable as a function of a time difference between the paired peak signals comprises:
substituting the time difference between the paired peak signals into the following formula to calculate the candidate discharge positions of the partial discharge sources in the cable:
wherein X is the candidate discharge position of the local discharge point source in the cable, L is the length of the cable, t Pi T is the time point at which the ith paired peak signal is located pj And v is the propagation speed of the partial discharge signal at the time point where the j-th paired peak signal is located.
8. The method of any of claims 1-7, wherein clustering the candidate discharge locations to obtain target discharge locations for a partial discharge source in the cable comprises:
sequencing the candidate discharge positions to obtain a position sequence;
dividing the position sequence into a plurality of data sets, wherein the difference value between two adjacent candidate discharge positions in the same data set is smaller than or equal to a preset first threshold value, and the difference value between the candidate discharge positions positioned at the boundaries of the two adjacent data sets is larger than the preset first threshold value;
if the number of the candidate discharge positions in the data set is smaller than or equal to a preset second threshold value, deleting the data set;
and if the number of the candidate discharge positions in the data set is larger than a preset second threshold value, calculating the average value of the candidate discharge positions in the data set, and obtaining the target discharge position of the partial discharge source in the cable.
9. An electronic device, the electronic device comprising:
At least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of partial discharge positioning of a cable according to any one of claims 1-8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for causing a processor to execute the partial discharge positioning method of a cable according to any one of claims 1-8.
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