CN110470960B - Cable partial discharge analysis method and device, storage medium and processor - Google Patents
Cable partial discharge analysis method and device, storage medium and processor Download PDFInfo
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- 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
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- 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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Abstract
The application discloses a cable partial discharge analysis method and device, a storage medium and a processor. The method comprises the following steps: acquiring a plurality of target values; obtaining a plurality of target proportion values according to the plurality of target values; constructing a three-dimensional space according to the target proportion values; acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of a plurality of target proportion values when the cable is in a first state, and the second track is used for representing a change track of a plurality of target proportion values when the cable is in a second state; and acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of cable partial discharge and risk analysis data of the cable. According to the method and the device, the problem that the traditional off-line or on-line diagnosis method cannot timely and comprehensively represent the local defects or the aging state of the cable when the cable is detected in the related technology is solved.
Description
Technical Field
The present disclosure relates to the field of cable communications, and in particular, to a method and an apparatus for analyzing partial discharge of a cable, a storage medium, and a processor.
Background
In the related technology, with the continuous improvement of the industrialization and urbanization level of China, the power demand is increased rapidly, and the requirement on the safety and stability of a power system is higher and higher. The power cable has the characteristics of simplicity and convenience in installation, high electrical strength, small dielectric loss and the like, can effectively solve the problems of urban power utilization aggregation effect and overlarge land occupancy rate of overhead lines, can be rapidly popularized in 6-35 kV power distribution networks and regional power transmission power grids of 110kV or above, has been developed into important equipment for electric energy transmission of various voltage levels, and has indispensable effects on safe power loads and reliable power transmission.
Partial discharge monitoring of power cables is an important technical means for ensuring safe operation of the cables. For early warning and state perception of power equipment, a sensitive, real-time and stable online monitoring system is indispensable, such as partial discharge monitoring, leakage current monitoring, temperature rise monitoring and the like, and the monitoring technologies are applied to main power grid power transmission and transformation equipment more mature.
For cable monitoring, the cable access amount is large, the number of monitoring nodes is large, and great challenges are brought to data storage, information matching and data application. The power cable detection and diagnosis technology covers power cable fault diagnosis, location and power cable state monitoring in power transmission, however, the complexity of the cable laying environment and the diversity of material structures bring difficulties and challenges to cable fault diagnosis and aging evaluation, the traditional off-line or on-line diagnosis method cannot timely and comprehensively represent local defects or aging states of cables, a physicochemical or optical analysis means has higher requirements on test conditions and lower efficiency, a large number of cables cannot be analyzed and evaluated, and the analysis of test results lacks better accuracy and contrast.
In view of the above problems in the related art, no effective solution has been proposed.
Disclosure of Invention
The present application mainly aims to provide an analysis method and apparatus, a storage medium, and a processor for cable partial discharge, so as to solve the problem that the conventional offline or online diagnosis method fails to comprehensively characterize the local defect or aging state of the cable in time when the cable is detected in the related art.
In order to achieve the above object, according to one aspect of the present application, there is provided a method of analyzing partial discharge of a cable. The method comprises the following steps: acquiring a plurality of target values, wherein the target values are used for representing the strength of a plurality of target signals, and the target signals comprise ultrahigh frequency signals, ultrasonic signals and high frequency signals; obtaining a plurality of target proportion values according to the plurality of target values; constructing a three-dimensional space according to the target proportion values; acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of a plurality of target proportion values when the cable is in a first state, and the second track is used for representing a change track of a plurality of target proportion values when the cable is in a second state; and acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of cable partial discharge and risk analysis data of the cable.
Further, before obtaining the plurality of target values, the method further comprises: and simulating the partial discharge of the cable, wherein the simulation comprises the simulation of the partial discharge state when the cable is in a first state and the simulation of the partial discharge state when the cable is in a second state, the first state is a state that the insulating layer is damaged, and the second state is a voltage suspension state.
Further, obtaining a plurality of target values comprises: obtaining a plurality of PRPD maps according to simulation; acquiring a plurality of target integral values of a plurality of target signals in a first preset time period according to a plurality of PRPD maps; a plurality of target values are obtained by subjecting the plurality of target integrated values to a reduction process.
Further, obtaining a plurality of target ratio values according to the plurality of target values includes: when the cable is in a first state, controlling the partial discharge capacity of the cable to be in a first preset range; and acquiring a plurality of target proportion values according to the change of the target values in a first preset range.
Further, obtaining a plurality of target ratio values according to the plurality of target values further includes: when the cable is in a second state, controlling the partial discharge capacity of the cable to be in a second preset range; and acquiring a plurality of target proportion values according to the change of the target values in a second preset range.
Further, constructing the three-dimensional space according to the plurality of target proportion values includes: converting the obtained target proportional values into target coordinate values; and constructing a three-dimensional space according to the plurality of target coordinate values.
Further, obtaining a plurality of target ratio values according to the plurality of target values further includes: when the cable is in a first state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the second preset time period of the corona aging.
Further, obtaining a plurality of target ratio values according to the plurality of target values further includes: when the cable is in a second state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the third preset time period of the corona aging.
In order to achieve the above object, according to another aspect of the present application, there is provided an analysis apparatus for partial discharge of a cable. The device includes: a first acquisition unit, configured to acquire a plurality of target values, wherein the plurality of target values are used for representing intensities of a plurality of target signals, and the plurality of target signals include a superfrequency signal, an ultrasound signal, and a high frequency signal; the second acquisition unit is used for acquiring a plurality of target proportion values according to the target values; the building unit is used for building a three-dimensional space according to the target proportion values; the third acquiring unit is used for acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing the variation track of the target proportional values when the cable is in the first state, and the second track is used for representing the variation track of the target proportional values when the cable is in the second state; and the fourth acquisition unit is used for acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of cable partial discharge and risk analysis data of the cable.
In order to achieve the above object, according to another aspect of the present application, there is provided a storage medium including a stored program, wherein the program performs a method of analyzing partial discharge of a cable according to any one of the above.
In order to achieve the above object, according to another aspect of the present application, there is provided a processor, a storage medium including a stored program, wherein the program performs a method of analyzing partial discharge of a cable according to any one of the above.
Through the application, the following steps are adopted: acquiring a plurality of target values, wherein the target values are used for representing the strength of a plurality of target signals, and the target signals comprise ultrahigh frequency signals, ultrasonic signals and high frequency signals; obtaining a plurality of target proportion values according to the plurality of target values; constructing a three-dimensional space according to the target proportion values; acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of a plurality of target proportion values when the cable is in a first state, and the second track is used for representing a change track of a plurality of target proportion values when the cable is in a second state; according to the first track and the second track, a cable analysis report is obtained, wherein the analysis report at least comprises cable partial discharge fault diagnosis data and cable danger degree analysis data, and when the cable is detected in the related technology, the problem that the traditional offline or online diagnosis method cannot timely and comprehensively represent the local defect or aging state of the cable is solved, so that the technical effect of preventing the cable insulation defect or fault in advance is achieved.
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The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a flowchart of a method for analyzing partial discharge of a cable according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a PRPD pattern of a VHF signal provided according to an embodiment of the present application in a state where a cable is damaged in an insulation layer;
fig. 3 is a schematic diagram of a PRPD pattern of a uhf signal in a cable in a misaligned suspension state according to an embodiment of the present application;
FIG. 4 is a graph illustrating a plurality of target ratio values as a function of discharge (or applied electric field strength) when a cable is subjected to an electric field in which an insulating layer is scratched, according to an embodiment of the present disclosure;
FIG. 5 is a graph illustrating a plurality of target ratio values as a function of discharge amount (or applied electric field strength) when the cable is under an electric field of a levitation potential according to an embodiment of the present application;
FIG. 6 is a schematic diagram of the spatial distribution of the discharge intensity ratio for a cable at a damaged insulation layer and at a floating potential under different applied voltages provided by an embodiment of the present application; and
fig. 7 is a schematic diagram of an analysis apparatus for partial discharge of a cable according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. 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.
According to an embodiment of the present application, a method of analyzing partial discharge of a cable is provided.
Fig. 1 is a flowchart of an analysis method for partial discharge of a cable according to an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:
step S101, obtaining a plurality of target values, wherein the target values are used for representing the strength of a plurality of target signals, and the target signals comprise ultrahigh frequency signals, ultrasonic signals and high frequency signals.
In the above, with the improvement of the requirement of the cable operation quality, the measurement of the partial discharge of the cable is gradually applied to the on-line or live detection of the cable as a real-time effective insulation diagnosis technology. The partial discharge detection of the cable is helpful for timely finding out sudden faults or developmental insulation defects at the cable body, the joint and the terminal, and preventing the further development of the insulation defects or faults of the cable.
In an embodiment provided by the application, a local discharge state of a cable is simulated through MATLAB, and signals during the local discharge of the cable are acquired to obtain a plurality of target values, wherein the target values are intensities of ultrahigh-frequency signals, high-frequency signals and ultrasonic signals emitted during the local discharge of the cable.
Step S102, a plurality of target proportion values are obtained according to a plurality of target values.
After obtaining a plurality of target values, the target values corresponding to each group of the ultrahigh frequency signal, the ultrasonic signal and the high frequency signal may form a group of target ratio values.
And step S103, constructing a three-dimensional space according to the target proportion values.
Specifically, the present embodiment uses a three-dimensional space formed by the average intensity ratios of the signals as a partial discharge analysis means.
Step S104, acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of a plurality of target proportion values when the cable is in the first state, and the second track is used for representing a change track of a plurality of target proportion values when the cable is in the second state.
Specifically, the embodiment mainly studies the change tracks of the three signals in the state that the cable is at the scratch of the insulating layer and at the suspension potential, so that the multi-physical partial discharge online monitoring data is tracked and analyzed for a long time through the constructed three-dimensional space, and identifiable spaces and characteristic tracks of various types of partial discharge modes are constructed.
And step S105, acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of cable partial discharge and risk analysis data of the cable.
In the above, the stage of the discharge fault development and the risk degree are analyzed according to the specific evolution path characteristics obtained when the cable is in two states. And subsequently, the state of the cable is monitored and predicted, and the danger degree of the cable is analyzed.
Optionally, before obtaining the plurality of target values, the method further comprises: and simulating the partial discharge of the cable, wherein the simulation comprises the simulation of the partial discharge state when the cable is in a first state and the simulation of the partial discharge state when the cable is in a second state, the first state is a state that the insulating layer is damaged, and the second state is a voltage suspension state.
Specifically, in the embodiment of the present application, target values in two states are determined mainly by simulating the two states of the cable.
Optionally, obtaining a plurality of target values comprises: obtaining a plurality of PRPD maps according to simulation; acquiring a plurality of target integral values of a plurality of target signals in a first preset time period according to a plurality of PRPD maps; a plurality of target values are obtained by subjecting the plurality of target integrated values to a reduction process.
Specifically, since the discharge activity is represented not only by the signal intensity but also by the discharge frequency, in this embodiment, when comparing the signal intensities of the respective channels, the integral value of the amplitude with the phase within the same time period (or the same number of power frequency cycles) is analyzed as a target.
Fig. 2 is a schematic diagram of a PRPD map of a uhf signal in a state where an insulation layer of a cable is damaged according to an embodiment of the present application. Fig. 3 is a schematic diagram of a PRPD pattern of an uhf signal in a cable in a misaligned suspension state according to an embodiment of the present application.
As can be seen from fig. 2 and 3, the average amplitude of the vhf signal in each spectrum is also reflected in fig. 2 and 3.
The PRPD pattern of the ultrasonic signal and the high-frequency signal under the condition that the cable is in the insulation layer damage and the suspension potential is a pattern with the above-mentioned fig. 2 and fig. 3, which is not repeated herein, and the PRPD pattern of the ultrahigh-frequency signal is taken as an example for explanation.
In the above way, various absolute values generated by partial discharge are difficult to be measured by sensors with limited bandwidth, sensitivity and detection scale, so signals obtained by the limited measurement system are all apparent values of signal amplitude (or energy). If the nonlinear attenuation process in the transmission process of the physical signal is neglected, it can be considered that a relatively stable proportional relationship exists between the measurement apparent values, that is, the evolution process of the partial discharge energy release can be reflected to a certain extent. In order to analyze the proportional relation of each way of signal at different stages of discharging, this patent carries out the reduction processing to signal strength, and its reduction value R' is calculated by following formula:
wherein DNR is the maximum dynamic range of signal intensity in the experiment (unit: dB); s is the average value (unit: dB) of the integral value of the signal strength over the measurement period, i.e. S is the average value of the integral value of the signal strength over the measurement period
Wherein S phi is the average value (unit: dB) in the fixed windowing length superposed by n alternating current periods (determined by the measurement duration); n is the alternating current period superposition times in the measurement duration; t is the duration of an alternating current period, and the power frequency alternating current is 0.02 s.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values includes: when the cable is in a first state, controlling the partial discharge capacity of the cable to be in a first preset range; and acquiring a plurality of target proportion values according to the change of the target values in a first preset range.
In the above, a plurality of target integrated values are processed to obtain a plurality of targetsAfter the value is marked, obtaining the normalized signal intensity of the ultrahigh frequency signal, the ultrasonic signal and the high frequency signal, and recording as R'UHF、R′AEAnd R'HFCT. FIG. 4 is a graph provided according to an embodiment of the present application showing a plurality of target ratio values as a function of discharge amount (or applied electric field strength) when the cable is in an electric field in which the insulating layer is scratched, and the proportional relationship of the intensity (R 'when the cable is in an electric field in which the insulating layer is scratched is reduced from FIG. 4'UHF、R′AEAnd R'HFCT) Schematic of the change with discharge amount (or applied electric field strength). FIG. 5 is a schematic diagram provided according to an embodiment of the present application and illustrating variation of a plurality of target proportional values with discharge amount (or applied electric field strength) when the cable is under an electric field at a floating potential, and the proportional relation of intensity (R 'is reduced when the cable is under an electric field at a floating potential, as shown in FIG. 5'UHF、R′AEAnd R'HFCT) Schematic of the change with discharge amount (or applied electric field strength).
As can be seen from fig. 4 and 5, the proportional relationship of the three-way signal intensities does not remain unchanged but evolves with a certain rule in the process of changing from weak to strong applied electric field.
Alternatively, after further removing the influence of the discharge amount variation on each signal intensity ratio, it is found that, as the corona aging time progresses, after the insulator insulation performance is significantly reduced (i.e., in the quality loss stage), the ultrasonic signal intensity ratio shows a significantly rising trend, and the ultrahigh frequency signal and high frequency signal intensity ratios gradually decrease.
Specifically, when the cable is in a state that the insulating layer is scratched, and the partial discharge amount of the cable is controlled to be within a range, partial discharge voltages applied to the cable are different, a plurality of different target values in each stage can be obtained through the difference of the partial discharge voltages, and different target proportion values are obtained according to changes.
For example: ultrasonic measurement at lower voltages (<1.9kV, discharge capacity<64pC) and no visible pulse occurred, R 'during the increase of the applied voltage from 2.5kV to 12.1kV (or the increase of the discharge capacity from 20pC to 2.41 nC)'UHFComponent gradually decreases, R'AEThe component gradually rises atNear breakdown, the two are closer, and in the process, R'HFCTAlmost constant and occupies a maximum proportion of (>0.4)。
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a second state, controlling the partial discharge capacity of the cable to be in a second preset range; and acquiring a plurality of target proportion values according to the change of the target values in a second preset range.
Specifically, when the cable is in a discharge condition of the dislocation suspension potential, and the control discharge amount is in a second preset range, the discharge voltage is changed in one range, and the three target signals are in different proportions due to the change of the discharge voltage.
For example, ultrasonic testing is performed at applied voltages of less than 4.5kV (discharge capacity)<68pC) no visible pulse was observed, R 'during the increase of the applied voltage from 5.9kV to 12.8kV (near breakdown)'UHFComponent gradually decreasing, R'AEThe component rises first and then falls, and the two are closer to each other near breakdown, during which R'HFCTThe component continuously rises and gradually occupies most of the proportion (>0.6)。
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a first state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the second preset time period of the corona aging.
For insulating layer scratching, ultrasonic measurement is carried out at a lower voltage (<1.9kV, discharge capacity<64pC) and no visible pulse occurred, R 'during the increase of the applied voltage from 2.5kV to 12.1kV (or the increase of the discharge capacity from 20pC to 2.41 nC)'UHFComponent gradually decreases, R'AEThe component gradually rises, and the two are closer to each other near breakdown, and R 'in the process'HFCTAlmost constant and occupies a maximum proportion of (>0.4); for the case of dislocated floating potential
Ultrasonic detection is carried out under the condition that the applied voltage is less than 4.5kV (discharge capacity)<68pC) no visible pulse was observed, R 'during the increase of the applied voltage from 5.9kV to 12.8kV (near breakdown)'UHFComponent gradually decreasing, R'AEThe component rises first and then falls, and the two are closer to each other near breakdown, during which R'HFCTThe component continuously rises and gradually occupies most of the proportion (>0.6)。
Specifically, in order to obtain the multi-physical signal evolution characteristic under the defect of the insulating layer scratch, the applied voltage is kept unchanged, the relation of the proportional relation of the intensity of each physical signal with the aging time of the corona is recorded under the medium corona degree, and in the pressing process lasting for 200 hours, the corona discharge can go through approximately three stages, namely a charge accumulation stage, a discharge stabilization stage and a quality loss stage. In the first stage (0h → 50h), as the discharge occurs, the charge continues to accumulate on the surface of the insulator and forms a corona stabilizing layer along the radial direction, so that the discharge activity is weakened, and therefore the discharge amount shows a certain descending trend along with the time (1.276nC → 1.235 nC); in the second stage (50h → 170h), the partial discharge activity level oscillates within a certain range, and does not show obvious rising or falling trend in general, and the steady stage of corona aging is realized; in the third stage (170h → near breakdown), the long-term continuous corona aging causes the surface of the insulator to be electrically corroded or ablated, and the local serious mass loss causes the electric field to be increased in a local area, thereby causing the continuous increase of the discharge activity (1.245nC → 1.334nC), and accompanied by the increase of the strength ratio of the ultrahigh frequency signal and the decrease of the strength ratio of the ultrasonic signal and the high frequency signal.
Since the proportional relationship of the physical signal intensities is changed by the magnitude of the discharge amount, even in the process that the voltage is kept unchanged but the corona is continuously aged, the proportional relationship of the physical signal intensities is influenced by the high-time and low-time discharge activity degree. In order to further reveal the influence of the corona duration on the proportional relation of the signal intensities, the patent adopts a plurality of formulas to R 'of each time'UHF、R′AEAnd R'HFCTPerforming reduction treatment to obtain R'norTo try best toThe influence of the change of the discharge activity degree is reduced.
Further, after the influence of the discharge amount change on each signal intensity ratio is removed, it is found that, as the corona aging time goes on, after the insulation performance of the insulator is obviously reduced (namely, in the quality loss stage), the ultrasonic signal intensity ratio shows an obvious rising trend, and the ultrahigh frequency signal and high frequency signal intensity ratio gradually decreases. And obtaining a plurality of target proportion values according to the intensity changes of the ultrasonic signals, the ultrahigh frequency signals and the high frequency signals.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a second state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the third preset time period of the corona aging.
Specifically, in the above-described scratching discharge for the insulating layer, the average discharge amount in the early stage of discharge (0h → 70h) tends to gradually decrease, but the middle and late stages of discharge do not exhibit a tendency characteristic. The change process of each signal proportion along with time after the influence of discharge amount change is removed can be obtained by adopting the same processing method as the scratch of the insulating layer. When the cable is at a floating potential, after the influence of the discharge amount change is removed, the change of each signal intensity proportion along with time shows a similar trend to the scratching condition of the insulating layer, and the proportion of the ultrahigh frequency signal gradually rises along with the passage of the discharge time (particularly after 110 h), and the proportion of the ultrasonic signal and the high frequency signal gradually falls. Therefore, a plurality of target ratio values in the floating potential state can be obtained within a predetermined period of corona aging.
Optionally, constructing the three-dimensional space according to the plurality of target proportion values includes: converting the obtained target proportional values into target coordinate values; and constructing a three-dimensional space according to the plurality of target coordinate values.
In particular, the synchronous monitoring of the ultrahigh frequency signal, the ultrasonic signal and the high frequency signal provides a multi-physical analysis method for the diagnosis of partial discharge. The patent is three-dimensional formed by the average intensity proportion of each path of signalSpace [ R'UHF、R′AEAnd R'HFCT]As a partial discharge analysis means.
Fig. 6 is a schematic diagram of the spatial distribution of the discharge intensity ratio under different applied voltages and with the cable at the damaged insulating layer and at the floating potential, as shown in fig. 6, the discharges of the two modes have different identifiable spaces, and the spatial evolution locus of the average intensity ratio has a higher applied voltage (average discharge amount). By means of the three-ratio analysis method, long-term tracking analysis can be conducted on the on-line monitoring data of the multi-physical partial discharge, and distinguishable spaces and characteristic tracks of various types of partial discharge modes are constructed and used for partial discharge fault mode diagnosis and risk degree evaluation.
As described above, for a specific switchgear, the propagation path of each signal influences the proportional evolution characteristic. Therefore, in future research, the multi-physical signal ratio relation of partial discharge under the structure of typical equipment such as a switch and the like can be pertinently and practically researched, and an evolution characteristic database of the typical equipment is constructed.
The embodiment utilizes a three-ratio analysis method, and can perform long-term tracking analysis on the on-line monitoring data of the multi-physical partial discharge. And meanwhile, identifiable spaces and characteristic tracks for constructing various types of partial discharge modes are established and used for cable partial discharge fault mode diagnosis and risk degree evaluation.
According to the analysis method for the partial discharge of the cable, a plurality of target values are obtained, wherein the target values are used for representing the strength of a plurality of target signals, and the target signals comprise ultrahigh-frequency signals, ultrasonic signals and high-frequency signals; obtaining a plurality of target proportion values according to the target values; constructing a three-dimensional space according to the target proportion values; acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of the target proportional values when the cable is in a first state, and the second track is used for representing a change track of the target proportional values when the cable is in a second state; and acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of the partial discharge of the cable and danger degree analysis data of the cable, so that the problem that a traditional offline or online diagnosis method cannot timely and comprehensively represent the local defect or the aging state of the cable when the cable is detected in the related technology is solved, and the technical effect of preventing the insulation defect or the fault of the cable in advance is further achieved.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
The embodiment of the present application further provides an analysis apparatus for cable partial discharge, and it should be noted that the analysis apparatus for cable partial discharge according to the embodiment of the present application may be used to execute the analysis method for cable partial discharge provided by the embodiment of the present application. The following describes an analysis apparatus for partial discharge of a cable according to an embodiment of the present application.
Fig. 7 is a schematic diagram of an analysis apparatus for partial discharge of a cable according to an embodiment of the present application. As shown in fig. 7, the apparatus includes: a first acquisition unit 701 configured to acquire a plurality of target values, wherein the plurality of target values are used to characterize intensities of a plurality of target signals, and the plurality of target signals include a superfrequency signal, an ultrasound signal, and a high frequency signal; a second obtaining unit 702, configured to obtain a plurality of target ratio values according to a plurality of target values; a constructing unit 703 configured to construct a three-dimensional space according to the multiple target proportion values; a third obtaining unit 704, configured to obtain, according to a three-dimensional space, a first trajectory and a second trajectory, where the first trajectory is used to represent a variation trajectory of the plurality of target proportional values when the cable is in the first state, and the second trajectory is used to represent a variation trajectory of the plurality of target proportional values when the cable is in the second state; a fourth obtaining unit 705, configured to obtain a cable analysis report according to the first trajectory and the second trajectory, where the analysis report at least includes cable partial discharge fault diagnosis data and cable risk analysis data.
The analysis apparatus for partial discharge of a cable provided in an embodiment of the present application is configured to obtain, by a first obtaining unit 701, a plurality of target values, where the plurality of target values are used to characterize intensities of a plurality of target signals, and the plurality of target signals include an ultrahigh frequency signal, an ultrasonic signal, and a high frequency signal; a second obtaining unit 702, configured to obtain a plurality of target ratio values according to a plurality of target values; a constructing unit 703 configured to construct a three-dimensional space according to the multiple target proportion values; a third obtaining unit 704, configured to obtain, according to a three-dimensional space, a first trajectory and a second trajectory, where the first trajectory is used to represent a variation trajectory of the plurality of target proportional values when the cable is in the first state, and the second trajectory is used to represent a variation trajectory of the plurality of target proportional values when the cable is in the second state; the fourth obtaining unit 705 is configured to obtain a cable analysis report according to the first track and the second track, where the analysis report at least includes cable partial discharge fault diagnosis data and cable risk analysis data, so as to solve a problem that a conventional offline or online diagnosis method fails to timely and comprehensively characterize a local defect or an aging state of a cable when the cable is detected in the related art, and further achieve a technical effect of preventing a cable insulation defect or a fault in advance.
Optionally, the apparatus further comprises: and the simulation unit is used for simulating the partial discharge of the cable before acquiring the target values, wherein the simulation comprises the simulation of the partial discharge state when the cable is in a first state and the simulation of the partial discharge state when the cable is in a second state, the first state is a state that the insulating layer is damaged, and the second state is a voltage suspension state.
Optionally, the first obtaining unit 701 includes: a first obtaining subunit, configured to obtain, according to the simulation, a plurality of PRPD maps; a second acquisition subunit, configured to acquire a plurality of target integrated values of the plurality of target signals in a first predetermined time period according to the plurality of PRPD maps; and the first processing subunit is used for carrying out reduction processing on the plurality of target integral values to obtain a plurality of target values.
Optionally, the second obtaining unit 702 includes: the first control subunit is used for controlling the partial discharge amount of the cable to be in a first preset range under the condition that the cable is in a first state; and the third acquisition subunit is used for acquiring a plurality of target proportion values according to the change of the target values in the first preset range.
Optionally, the second obtaining unit 702 further includes: the second control subunit is used for controlling the partial discharge amount of the cable to be in a second preset range under the condition that the cable is in a second state; and the fourth obtaining subunit is used for obtaining a plurality of target proportion values according to the change of the target value in the second preset range.
Optionally, the building unit 703 comprises: the conversion subunit is used for converting the obtained target proportional values into target coordinate values; and the construction subunit is used for constructing a three-dimensional space according to the plurality of target coordinate values.
Optionally, the second obtaining unit 702 further includes: the second processing subunit is used for controlling the partial discharge voltage of the cable to be unchanged and carrying out reduction processing on the plurality of target values when the cable is in the first state; and the fifth acquisition subunit is used for acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the second preset time period of the corona aging.
Optionally, the second obtaining unit 702 further includes: the third processing subunit is used for controlling the partial discharge voltage of the cable to be unchanged and carrying out reduction processing on the plurality of target values when the cable is in the second state; and the sixth acquisition subunit is used for acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in a third preset time period of the corona aging.
The first acquisition unit, the second acquisition unit 702, the construction unit 703, the third acquisition unit 704, the fourth acquisition unit 705 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one kernel can be set, and the problem that the traditional off-line or on-line diagnosis method cannot timely and comprehensively represent the local defect or the aging state of the cable when the cable is detected in the related technology is solved by adjusting kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a storage medium, on which a program is stored, which, when executed by a processor, implements the method for analyzing partial discharge of a cable.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program is used for executing the analysis method for the partial discharge of the cable during running.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps: acquiring a plurality of target values, wherein the target values are used for representing the strength of a plurality of target signals, and the target signals comprise ultrahigh frequency signals, ultrasonic signals and high frequency signals; obtaining a plurality of target proportion values according to the plurality of target values; constructing a three-dimensional space according to the target proportion values; acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of a plurality of target proportion values when the cable is in a first state, and the second track is used for representing a change track of a plurality of target proportion values when the cable is in a second state; and acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of cable partial discharge and risk analysis data of the cable.
Optionally, before obtaining the plurality of target values, the method further comprises: and simulating the partial discharge of the cable, wherein the simulation comprises the simulation of the partial discharge state when the cable is in a first state and the simulation of the partial discharge state when the cable is in a second state, the first state is a state that the insulating layer is damaged, and the second state is a voltage suspension state.
Optionally, obtaining a plurality of target values comprises: obtaining a plurality of PRPD maps according to simulation; acquiring a plurality of target integral values of a plurality of target signals in a first preset time period according to a plurality of PRPD maps; a plurality of target values are obtained by subjecting the plurality of target integrated values to a reduction process.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values includes: when the cable is in a first state, controlling the partial discharge capacity of the cable to be in a first preset range; and acquiring a plurality of target proportion values according to the change of the target values in a first preset range.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a second state, controlling the partial discharge capacity of the cable to be in a second preset range; and acquiring a plurality of target proportion values according to the change of the target values in a second preset range.
Optionally, constructing the three-dimensional space according to the plurality of target proportion values includes: converting the obtained target proportional values into target coordinate values; and constructing a three-dimensional space according to the plurality of target coordinate values.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a first state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the second preset time period of the corona aging.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a second state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the third preset time period of the corona aging. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: acquiring a plurality of target values, wherein the target values are used for representing the strength of a plurality of target signals, and the target signals comprise ultrahigh frequency signals, ultrasonic signals and high frequency signals; obtaining a plurality of target proportion values according to the plurality of target values; constructing a three-dimensional space according to the target proportion values; acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of a plurality of target proportion values when the cable is in a first state, and the second track is used for representing a change track of a plurality of target proportion values when the cable is in a second state; and acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of cable partial discharge and risk analysis data of the cable.
Optionally, before obtaining the plurality of target values, the method further comprises: and simulating the partial discharge of the cable, wherein the simulation comprises the simulation of the partial discharge state when the cable is in a first state and the simulation of the partial discharge state when the cable is in a second state, the first state is a state that the insulating layer is damaged, and the second state is a voltage suspension state.
Optionally, obtaining a plurality of target values comprises: obtaining a plurality of PRPD maps according to simulation; acquiring a plurality of target integral values of a plurality of target signals in a first preset time period according to a plurality of PRPD maps; a plurality of target values are obtained by subjecting the plurality of target integrated values to a reduction process.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values includes: when the cable is in a first state, controlling the partial discharge capacity of the cable to be in a first preset range; and acquiring a plurality of target proportion values according to the change of the target values in a first preset range.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a second state, controlling the partial discharge capacity of the cable to be in a second preset range; and acquiring a plurality of target proportion values according to the change of the target values in a second preset range.
Optionally, constructing the three-dimensional space according to the plurality of target proportion values includes: converting the obtained target proportional values into target coordinate values; and constructing a three-dimensional space according to the plurality of target coordinate values.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a first state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the second preset time period of the corona aging.
Optionally, obtaining a plurality of target ratio values according to a plurality of target values further includes: when the cable is in a second state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on a plurality of target values; and acquiring a plurality of target proportion values according to the plurality of target values of the reduction treatment in the third preset time period of the corona aging.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A method for analyzing partial discharge of a cable, comprising:
acquiring a plurality of target values, wherein the target values are used for representing the strength of a plurality of target signals, and the target signals comprise ultrahigh frequency signals, ultrasonic signals and high frequency signals;
obtaining a plurality of target proportion values according to the target values;
constructing a three-dimensional space according to the target proportion values;
acquiring a first track and a second track according to the three-dimensional space, wherein the first track is used for representing a change track of the target proportional values when the cable is in a first state, and the second track is used for representing a change track of the target proportional values when the cable is in a second state;
acquiring a cable analysis report according to the first track and the second track, wherein the analysis report at least comprises fault diagnosis data of partial discharge of the cable and danger degree analysis data of the cable;
before obtaining the plurality of target values, the method further comprises: simulating partial discharge of a cable, wherein the simulation comprises simulation of a partial discharge state when the cable is in the first state and simulation of a partial discharge state when the cable is in the second state, the first state is a state in which an insulating layer is damaged, and the second state is a voltage suspension state;
obtaining a plurality of target values includes: obtaining a plurality of PRPD maps according to the simulation; acquiring a plurality of target integrated values of the plurality of target signals in a first preset time period according to the plurality of PRPD maps; and carrying out reduction processing on the plurality of target integrated values to obtain the plurality of target values.
2. The method of claim 1, wherein obtaining a plurality of target ratio values based on the plurality of target values comprises:
when the cable is in the first state, controlling the partial discharge capacity of the cable to be in a first preset range;
and acquiring a plurality of target proportion values according to the change of the target values in the first preset range.
3. The method of claim 1, wherein obtaining a plurality of target ratio values based on the plurality of target values further comprises:
when the cable is in the second state, controlling the partial discharge capacity of the cable to be in a second preset range;
and acquiring a plurality of target proportion values according to the change of the target values in the second preset range.
4. The method of claim 1, wherein constructing a three-dimensional space from the plurality of target scale values comprises:
converting the obtained target proportional values into target coordinate values;
and constructing the three-dimensional space according to the target coordinate values.
5. The method of claim 1, wherein obtaining a plurality of target ratio values based on the plurality of target values further comprises:
when the cable is in the first state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on the target values;
and acquiring the target proportion values according to the target values of the reduction treatment in a second preset time period of the corona aging.
6. The method of claim 1, wherein obtaining a plurality of target ratio values based on the plurality of target values further comprises:
when the cable is in the second state, controlling the partial discharge voltage of the cable to be unchanged, and carrying out reduction processing on the target values;
and acquiring the target proportion values according to the target values of the reduction treatment in a third preset time period of the corona aging.
7. An apparatus for analyzing partial discharge of a cable, comprising:
a first acquisition unit, configured to acquire a plurality of target values, wherein the target values are used for representing intensities of a plurality of target signals, and the target signals include a superfrequency signal, an ultrasound signal, and a high-frequency signal;
the second obtaining unit is used for obtaining a plurality of target proportion values according to the target values;
the building unit is used for building a three-dimensional space according to the target proportion values;
a third obtaining unit, configured to obtain a first trajectory and a second trajectory according to the three-dimensional space, where the first trajectory is used to represent a variation trajectory of the multiple target proportional values when the cable is in the first state, and the second trajectory is used to represent a variation trajectory of the multiple target proportional values when the cable is in the second state;
a fourth obtaining unit, configured to obtain a cable analysis report according to the first trajectory and the second trajectory, where the analysis report at least includes fault diagnosis data of partial discharge of the cable and risk analysis data of the cable;
the device further comprises: the simulation unit is used for simulating the partial discharge of the cable before a plurality of target values are obtained, wherein the simulation comprises the simulation of the partial discharge state when the cable is in a first state and the simulation of the partial discharge state when the cable is in a second state, the first state is a state that an insulating layer is damaged, and the second state is a voltage suspension state;
the first acquisition unit includes: a first obtaining subunit, configured to obtain, according to the simulation, a plurality of PRPD maps; a second acquisition subunit, configured to acquire a plurality of target integrated values of the plurality of target signals in a first predetermined time period according to the plurality of PRPD maps; and the first processing subunit is used for carrying out reduction processing on the plurality of target integral values to obtain a plurality of target values.
8. A storage medium and a processor, wherein the storage medium includes a stored program, and the processor is configured to execute the program, wherein the program performs a method of analyzing partial discharge of a cable according to any one of claims 1 to 6.
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