CN114966272A - Lightning arrester state online monitoring method, device, equipment and medium - Google Patents
Lightning arrester state online monitoring method, device, equipment and medium Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application discloses an arrester state on-line monitoring method, device, equipment and medium, the method comprises the following steps: acquiring a current waveform sequence and a voltage waveform sequence which are acquired by the lightning arrester according to preset sampling parameters; judging the effectiveness of the current waveform sequence and the voltage waveform sequence; if the current waveform sequence and the voltage waveform sequence are effective, acquiring fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence; calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence; comparing the resistive current with a preset threshold value, and if the resistive current is greater than or equal to the preset threshold value, judging that the operating state of the lightning arrester is dangerous; otherwise, the lightning arrester is judged to be in good running state. The method and the device can master the running state of the lightning arrester in real time, detect whether the lightning arrester fails or not, and can timely cope with the failure; the result is more accurate when the resistive current is calculated, the running state of the lightning arrester is reflected in real time, and an alarm is sent out in time to prevent harm.
Description
Technical Field
The application relates to the technical field of lightning arrester state detection, in particular to an online lightning arrester state monitoring method, device, equipment and medium.
Background
The metal oxide lightning arrester is mainly formed by serially connecting zinc oxide valve plates and has very good nonlinear volt-ampere characteristics. The metal oxide lightning arrester has large resistivity under the power frequency voltage, and can quickly and effectively inhibit the power frequency current; the resistivity becomes very small under the overvoltage of lightning, can well discharge the lightning current, and is widely applied to the overvoltage protection of a power system. However, with the increase of the operation time of the metal oxide lightning arrester and the defects of the product thereof, the problems of moisture and aging of the lightning arrester under the operation voltage are increasingly prominent.
In the prior art, a technician usually performs a preventive test on the state of the arrester at intervals to determine whether the arrester has a fault. However, since the lightning arrester has a fast failure development speed, the method cannot grasp the operation state of the lightning arrester in real time, so that the lightning arrester cannot be repaired or replaced in time to reduce the damage caused by the failure, and therefore, the operation condition of the lightning arrester must be grasped by combining other testing means to ensure the safe operation of the lightning arrester.
Disclosure of Invention
In order to solve the problems that in the prior art, when the state of the arrester is detected, a technician performs a detection test at intervals, the operation state of the arrester cannot be mastered in real time, so that damage cannot be dealt with in time and danger and property damage are caused, the application discloses an online monitoring method, device, equipment and medium for the state of the arrester.
The application discloses in a first aspect, an arrester state online monitoring method, including:
acquiring a current waveform sequence and a voltage waveform sequence which are acquired by the lightning arrester according to preset sampling parameters; the preset sampling parameters comprise preset sampling time and preset sampling frequency;
judging the validity of the current waveform sequence and the voltage waveform sequence;
if the current waveform sequence and the voltage waveform sequence are effective, acquiring fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence;
calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence;
comparing the resistive current of the arrester with a preset threshold value, and if the resistive current is greater than or equal to the preset threshold value, judging that the operating state of the arrester is dangerous; and if the resistive current is smaller than the preset threshold value, judging that the running state of the lightning arrester is good.
Optionally, the method further includes:
and if the current waveform sequence and/or the voltage waveform sequence are/is invalid, resetting the sampling time, and acquiring the current waveform sequence and the voltage waveform sequence which are acquired by the lightning arrester according to the reset sampling time and the preset sampling frequency.
Optionally, the method further includes: judging the validity of the current waveform sequence, comprising:
obtaining a grouped current waveform sequence, wherein the grouped current waveform sequence is obtained by equal grouping according to the current waveform sequence and the number of current samples;
obtaining a time sequence, wherein time samples in the time sequence correspond to current samples in the current waveform sequence;
acquiring a grouping time sequence according to the time sequence and the grouping current waveform sequence; the time samples in the grouped time series correspond to current samples in the grouped current waveform series;
acquiring an energy value of each grouped current waveform sequence according to the grouped current waveform sequence and the grouped time sequence;
acquiring an energy value sequence, wherein the energy value sequence is obtained according to the descending sequence of the energy values of the grouped current waveform sequences;
equally dividing the energy value sequence into two groups according to a sorting sequence to obtain a first energy sequence and a second energy sequence, wherein any energy value in the first energy sequence is larger than any energy value in the second energy sequence;
acquiring a first total energy and a second total energy, wherein the first total energy is the sum of energy values in the first energy sequence, and the second total energy is the sum of energy values in the second energy sequence;
acquiring an energy ratio of the first total energy to the second total energy;
if the energy ratio is greater than or equal to a preset energy ratio threshold, determining that the current waveform sequence is valid; and if the total energy value is smaller than the preset energy ratio threshold value, determining that the current waveform sequence is invalid.
Optionally, the method further includes: judging the validity of the voltage waveform sequence;
the judging the validity of the voltage waveform sequence comprises the following steps:
and judging the effectiveness of the voltage waveform sequence according to a similarity judgment method or an amplitude judgment method.
Optionally, if the current waveform sequence and the voltage waveform sequence are valid, obtaining the fundamental wave initial phase of the current waveform sequence and the voltage waveform sequence includes:
acquiring sampling points and the number of the sampling points in a power frequency period according to a preset sampling frequency;
acquiring a current waveform element group according to the sampling points and the number of the sampling points; the current waveform element group comprises current samples corresponding to sampling points of the number of the front sampling points in the current waveform sequence;
and acquiring a fundamental wave initial phase of the current waveform sequence according to a first preset formula and the current waveform element group.
Optionally, the first preset formula is as follows:
wherein N is the number of sampling points and N is the number of sampling points,
m is 1, 2, 3 … … N,
is a plurality of the number of the optical fibers,
the phase angle of (2) is the initial phase of the fundamental wave of the current waveform sequence.
Optionally, the method further includes:
acquiring a voltage waveform element group according to the sampling points and the number of the sampling points; the voltage waveform element group comprises voltage samples corresponding to sampling points of the number of front sampling points in the voltage waveform sequence;
and acquiring a fundamental wave initial phase of the voltage waveform sequence according to the voltage waveform element group.
Optionally, calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence includes:
obtaining an effective value of the current waveform sequence according to a second preset formula;
and acquiring the resistive current of the lightning arrester by adopting a third preset formula according to the initial phase of the fundamental wave of the current waveform sequence, the initial phase of the fundamental wave of the voltage waveform sequence and the effective value of the current waveform sequence.
Optionally, the second preset formula is as follows:
wherein, I is an effective value of the current waveform sequence, N is the number of sampling points, I (I) is the current waveform sequence, and I is 1, 2, and 3 … … N.
Optionally, the third preset formula is as follows:
wherein, I R Resistive current for lightning arrester
Is the primary phase of the fundamental wave of the voltage waveform sequence,
is the primary phase of the fundamental wave of the current waveform sequence.
The second aspect of the present application discloses an arrester state on-line monitoring device, includes:
the lightning arrester monitoring system comprises a waveform sequence acquisition module, a data acquisition module and a data processing module, wherein the waveform sequence acquisition module is used for acquiring a current waveform sequence and a voltage waveform sequence which are acquired by the lightning arrester according to preset sampling parameters; the preset sampling parameters comprise preset sampling time and preset sampling frequency;
the validity judging module is used for judging the validity of the current waveform sequence and the voltage waveform sequence;
the fundamental wave initial phase acquisition module is used for acquiring the fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence if the current waveform sequence and the voltage waveform sequence are effective;
the resistive current calculation module is used for calculating the resistive current of the lightning arrester according to the fundamental wave initial phase of the current waveform sequence and the voltage waveform sequence;
the lightning arrester state judging module is used for comparing the resistive current of the lightning arrester with a preset threshold value, and if the resistive current is greater than or equal to the preset threshold value, judging that the operating state of the lightning arrester is dangerous; and if the resistive current is smaller than the preset threshold value, judging that the running state of the lightning arrester is good.
The third aspect of the application discloses an arrester state online monitoring device, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize an arrester online monitoring method.
A fourth aspect of the present application discloses a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, causes the processor to execute the method for online monitoring of an arrester.
The application discloses an arrester state on-line monitoring method, device, equipment and medium, the method comprises the following steps: acquiring a current waveform sequence and a voltage waveform sequence which are acquired by the lightning arrester according to preset sampling parameters; the preset sampling parameters comprise preset sampling time and preset sampling frequency; judging the validity of the current waveform sequence and the voltage waveform sequence; if the current waveform sequence and the voltage waveform sequence are effective, acquiring fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence; calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence; comparing the resistive current of the arrester with a preset threshold value, and if the resistive current is greater than or equal to the preset threshold value, judging that the operating state of the arrester is dangerous; and if the resistive current is smaller than the preset threshold value, judging that the running state of the lightning arrester is good.
The method and the device can master the running state of the lightning arrester in real time, detect whether the lightning arrester has a fault or not, and can timely cope with the fault when the fault occurs, so that the probability of danger occurrence is reduced, and property loss caused by the fault of the lightning arrester is reduced; according to the lightning arrester, the acquired voltage data and current data are screened, the calculation result is more accurate when the resistive current is calculated, the running state of the lightning arrester can be reflected in real time, and an alarm is sent out in time to prevent damage; the application discloses a method for judging the validity of a current waveform and the validity of a voltage waveform, which avoids meaningless data calculation and improves the efficiency of calculating resistive current.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a scene application diagram of an online monitoring method for the state of an arrester according to an embodiment of the present application;
fig. 2 is a schematic flow chart of an online monitoring method for the state of an arrester according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an online monitoring device for the state of an arrester, disclosed in an embodiment of the present application;
in the figure: 1-a wire or bus; 2-a lightning arrester; 3-a voltage acquisition terminal; 4-a current collection terminal; 5-edge compute nodes; 6-monitoring the system background; 7-a remote client; 8-low power wireless communication protocol; 9-power intranet.
Detailed Description
In order to solve the problems that in the prior art, when the state of the arrester is detected, a technician performs a detection test at intervals, the operation state of the arrester cannot be mastered in real time, so that damage cannot be dealt with in time and danger and property damage are caused, the application discloses an online monitoring method, device, equipment and medium for the state of the arrester.
The application process is applied to the scene shown in fig. 1, and comprises the following steps: the monitoring system background 6 issues an acquisition instruction to the edge computing node 5, and sets an acquisition time point or an acquisition mode.
After receiving the instruction, the edge computing node 5 sends an acquisition instruction to the voltage acquisition terminal 3 and the current acquisition terminal 4 through a low-power wireless communication protocol 8 broadcast channel.
After receiving the synchronous acquisition instruction, the voltage acquisition terminal 3 and the current acquisition terminal 4 synchronously acquire voltage and current data and upload the data to the edge calculation node 5.
The edge computing node 5 analyzes the acquired data, calculates related parameters such as resistive current and the like after effectiveness judgment, and uploads the related parameters to the monitoring system background 6 for storage.
For the lightning arrester with the resistive current exceeding the standard, the monitoring system background 6 can send alarm information in time, and meanwhile, the alarm signal is pushed to the mobile phone of the operation and inspection personnel.
The monitoring system background 6 is communicated with the edge computing node 5 in an electric power intranet mode, and data interaction is carried out between the edge computing node 5 and the voltage acquisition terminal 3 and between the edge computing node 5 and the current acquisition terminal 4 through a low-power-consumption wireless communication protocol.
To master the operating condition of the arrester, the resistive current of the arrester needs to be measured. In the prior art, the resistive current of the lightning arrester is mainly measured by methods of on-line monitoring of the total current and the resistive current component, field irregular live measurement of the total current and the resistive current component, infrared monitoring of the temperature of the lightning arrester and the like. The online monitoring mode has high real-time performance, is beneficial to timely finding the defects of the lightning arrester and preventing the defects from developing into serious accidents, and is the trend of the development of the lightning arrester state monitoring technology. However, incomplete waveform data and invalid data often exist in the current data and the voltage data acquired by the method, screening cannot be performed in the prior art, and the calculated result of the resistive current of the lightning arrester is inaccurate and the calculation efficiency is low, so that the operation state of the lightning arrester cannot be accurately mastered.
The first embodiment of the present application discloses an online monitoring method for the state of an arrester, referring to a schematic flow diagram shown in fig. 2, including:
102, judging the validity of the current waveform sequence and the voltage waveform sequence; specifically, the method comprises the following steps:
and acquiring a grouped current waveform sequence, wherein the grouped current waveform sequence is acquired by equal grouping according to the current waveform sequence and the current sample number.
Acquiring a time sequence; the time samples in the time series correspond to the current samples in the sequence of current waveforms. Let the current waveform sequence be [ x ] 1 ,x 2 ,x 3 ,x 4 ...x n ]N samples in total, the waveform sequence corresponds to a time sequence of [ t 1 ,t 2 ,t 3 ,t 4 ...t n ]And if n samples are counted, judging that the implementation flow is as follows:
acquiring a grouping time sequence according to the time sequence and the grouping current waveform sequence; in said packet time sequenceThe time samples correspond to current samples in the sequence of grouped current waveforms; sequence of current waveforms [ x ] 1 ,x 2 ,x 3 ,x 4 ...x n ]The total of n samples is divided equally into k shares (generally k is 10, and divided by n is an integer), each share is n/k samples, for example:
will waveform sequence x 1 ,x 2 ,x 3 ,x 4 ...x n ]Dividing n samples into 10 parts in total, and then dividing the samples into [ x ] 1 ,x 2 ,x 3 ...x 10 ]、[x 11 ,x 12 ,x 13 ...x 20 ]、[x 21 ,x 22 ,x 23 ...x 30 ]...[x n-9 ,x n-8 ,x n-7 ...x n ]。
Acquiring an energy value of each grouped current waveform sequence according to the grouped current waveform sequence and the grouped time sequence; after dividing the current sequence equally, the energy of each sample was calculated as follows:
for example, a waveform sequence [ x ] 1 ,x 2 ,x 3 ,x 4 ...x n ]The total of n samples are divided equally into k shares, then the first share is denoted as [ x ] 1 ,x 2 ,x 3 ,x 4 ...x k ]The corresponding time series is denoted as [ t ] 1 ,t 2 ,t 3 ,t 4 ...t k ]Then the energy of the first segment is:
E 1 ＝|x 1 |*t 1 +|x 2 |*t 2 +|x 3 |*t 3 +...+|x k |*t k 。
the energies of all the divided portions are calculated in turn and are denoted as E in turn 1 、E 2 、E 3 ...E k 。
And acquiring an energy value sequence, wherein the energy value sequence is acquired according to the descending sequence of the energy values of the grouped current waveform sequences.
And equally dividing the energy value sequence into two groups according to a sorting sequence to obtain a first energy sequence and a second energy sequence, wherein any energy value in the first energy sequence is larger than any energy value in the second energy sequence. That is, the energy value sequence may be divided into two groups in equal number according to the sorting order, for example, 10 energy values, in the order of energy values from high to low, the first five energy values may be divided into one group, and the last five energy values may be divided into another group.
Acquiring a first total energy and a second total energy; the first total energy is the sum of energy values in the first energy sequence; the second total energy is the sum of energy values in the second energy sequence; front of the aligned energy
Adding the fractions, calculating the total energy, and recording as E q After, after
Adding the fractions and recording as E h 。
Acquiring an energy ratio of the first total energy to the second total energy; dividing the total energy calculated above and recording as
If the energy ratio is greater than or equal to a preset energy ratio threshold, determining that the current waveform sequence is valid; and if the total energy value is smaller than the preset energy ratio threshold value, determining that the current waveform sequence is invalid. Specifically, if eq is greater than or equal to λ (λ is an integer greater than or equal to 5, and generally takes the value of 10), the waveform is valid, otherwise, the waveform is invalid.
The judging the validity of the voltage waveform sequence further comprises:
and judging the effectiveness of the voltage waveform sequence according to a similarity judgment method or an amplitude judgment method.
The similarity determination method specifically comprises the following steps: the voltage monitoring terminal directly mounted on the power transmission line body is used for collecting voltage waveforms and recording an initial electrification time waveform sequence X, at the moment, the amplitude of the voltage waveform is A, and the voltage waveform at the initial electrification time is used as reference voltage.
The voltage waveform sequence collected is marked as Y, and the amplitude is B.
According to the sampling time point of the monitoring terminal, the monitored voltage waveforms are integrated according to the sampling points, and the voltage waveforms collected by the line are respectively integrated into X ═ X 1 ,x 2 ,x 3 ,x 4 …x n }，Y＝{y 1 ,y 2 ,y 3 ,y 4 …y n }。
Calculating Pearson correlation coefficient between every two voltage waveforms collected by the integrated line, and recording the Pearson correlation coefficient as rho xy1 The calculation method is as follows:
circularly arranging the voltage waveforms, placing the tail element in the voltage waveform array collected by the line at the head of the array to form a new array, and calculating Pearson correlation coefficient between the new array and the reference voltage and respectively recording the Pearson correlation coefficient as rho xy2 (ii) a (e.g., put the array X ═ X 1 ,x 2 ,x 3 ,x 4 …x n Changing according to the above rule to form a new array X 1 ＝{x n ,x 1 ,x 2 ,x 3 ,x 4 …x n-1 Get the new array X 1 Calculating the Pearson correlation coefficient with the unchanged array Y in the same step 3, and recording the calculation result as rho xy 2)。
Changing the new array according to the step (4), and cycling for n times to finally obtain rho xy1 、ρ xy2 、ρ xy3 、ρ xy 4...ρ xyn 。
Compare | ρ xy1 |、|ρ xy2 |、|ρ xy3 |、|ρ xy4 |...|ρ xyn Taking the maximum value as the effective correlation coefficient and recording as rho xy is 。
Effective correlation coefficient rho of voltage data and reference voltage data in normal operation process xy is Make a determination if
And if the data acquired by the voltage acquisition terminal is invalid, the data is directly discarded.
The amplitude judgment method specifically comprises the following steps: according to the relevant requirements of an electric power system, the operating voltage of the electric transmission line does not exceed +/-10% of the rated voltage, so the method is mainly based on the principle to judge the voltage waveform sequence collected by the system, and the specific judging method is as follows:
the voltage class of the line installed for voltage monitoring is WkV lines (such as 110kV, 220kV lines, etc.), and then the single-phase voltage is recorded as
Recording the waveform sequence of the voltage sensor as X ═ X 1 ,x 2 ,x 3 ,x 4 …x n }。
Windowing: and adding a window (l is a positive integer) with the length of s sampling points to the voltage waveform, judging whether the values of the sampling points in the window are in the range of [ 0.9V, 1.1V ], if so, directly judging the waveform to be effective, and if not, entering the next step.
And (3) sliding a window with the length of s backwards, wherein the step length is 1 sampling point, and judging the waveform effectiveness by using a sliding window method.
And circulating the steps until the window comprises the sampling point at the tail end of the voltage waveform sequence, if the sampling points in all the sliding windows do not meet the conditions, judging that the waveform is invalid, and otherwise, judging that the waveform is valid if the waveform meeting the conditions exists.
And if the current waveform sequence and/or the voltage waveform sequence are/is invalid, resetting the sampling time, and acquiring the current waveform sequence and the voltage waveform sequence of the lightning arrester.
And 103, if the current waveform sequence and the voltage waveform sequence are effective, acquiring fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence. Specifically, the method comprises the following steps: and acquiring the fundamental wave initial phase of the current waveform sequence.
Acquiring sampling points and the number of the sampling points in a power frequency period according to a preset sampling frequency fs/Hz; one power frequency period (i.e. 20ms) corresponds to N, and N is 0.02 × fs.
Acquiring a current waveform element group according to the sampling points and the number of the sampling points; the current waveform element group comprises current samples corresponding to sampling points of the number of the front sampling points in the current waveform sequence.
And acquiring a fundamental wave initial phase of the current waveform sequence according to a first preset formula and the current waveform element group.
The first preset formula is as follows:
wherein N is the number of sampling points and N is the number of sampling points,
is a current waveform element group, m is 1, 2, 3 … … N,
is a plurality of the number of the optical fibers,
the phase angle of (1) is the initial phase of the fundamental wave of the current waveform sequence. The total length M of the current waveform sequence is not less than 2N, and the length of the current array and the sampling rate are the same as the length of the current waveform sequence.
If the current waveform sequence with the voltage waveform sequence is effective, acquire the initial phase of current waveform sequence and voltage waveform sequence, still include: and acquiring the fundamental wave initial phase of the voltage waveform sequence.
Acquiring a voltage waveform element group according to the sampling points and the number of the sampling points; the voltage waveform element group comprises voltage samples corresponding to sampling points of the number of the front sampling points in the voltage waveform sequence.
And acquiring a fundamental wave initial phase of the voltage waveform sequence according to the voltage waveform element group. And calculating the initial phase of the fundamental wave of the voltage waveform sequence according to the same method when the initial phase of the current waveform sequence is calculated.
And if the current waveform sequence and/or the voltage waveform sequence are/is invalid, resetting the sampling time, and acquiring the current waveform sequence and the voltage waveform sequence which are acquired by the lightning arrester according to the reset sampling time and the preset sampling frequency.
And 104, calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence. Specifically, the method comprises the following steps:
and acquiring the effective value of the current waveform sequence according to a second preset formula.
And acquiring the resistive current of the lightning arrester by adopting a third preset formula according to the initial phase of the fundamental wave of the current waveform sequence, the initial phase of the fundamental wave of the voltage waveform sequence and the effective value of the current waveform sequence.
The second preset formula is as follows:
wherein, I is an effective value of the current waveform sequence, N is the number of sampling points, I (I) is the current waveform sequence, and I is 1, 2, and 3 … … N.
The third preset formula is as follows:
wherein, I R Is the resistive current of the lightning arrester,
is the primary phase of the fundamental wave of the voltage waveform sequence,
is the primary phase of the fundamental wave of the current waveform sequence.
According to the method for monitoring the state of the lightning arrester on line, a current waveform sequence and a voltage waveform sequence which are acquired by the lightning arrester according to preset sampling parameters are acquired; the preset sampling parameters comprise preset sampling time and preset sampling frequency; judging the validity of the current waveform sequence and the voltage waveform sequence; if the current waveform sequence and the voltage waveform sequence are effective, acquiring fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence; calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence; comparing the resistive current of the arrester with a preset threshold value, and if the resistive current is greater than or equal to the preset threshold value, judging that the operating state of the arrester is dangerous; and if the resistive current is smaller than the preset threshold value, judging that the running state of the lightning arrester is good.
The method and the device can master the running state of the lightning arrester in real time, detect whether the lightning arrester has a fault or not, and can timely cope with the fault when the fault occurs, so that the probability of danger occurrence is reduced, and property loss caused by the fault of the lightning arrester is reduced; according to the lightning arrester, the acquired voltage data and current data are screened, the calculation result is more accurate when the resistive current is calculated, the running state of the lightning arrester can be reflected in real time, and an alarm is sent out in time to prevent harm; the application discloses a method for judging the validity of a current waveform and the validity of a voltage waveform, which avoids meaningless data calculation and improves the efficiency of calculating resistive current.
The second embodiment of the present application discloses an online monitoring device for the state of an arrester, referring to the schematic structural diagram shown in fig. 3, including:
the waveform sequence acquisition module 10 is used for acquiring a current waveform sequence and a voltage waveform sequence acquired by the lightning arrester according to preset sampling parameters; the preset sampling parameters comprise preset sampling time and preset sampling frequency.
And the validity judging module 20 is used for judging the validity of the current waveform sequence and the voltage waveform sequence.
And the fundamental wave initial phase acquisition module 30 is used for acquiring the fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence if the current waveform sequence and the voltage waveform sequence are effective.
And the resistive current calculating module 40 is used for calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence.
The lightning arrester state judging module 50 is configured to compare the resistive current of the lightning arrester with a preset threshold, and if the resistive current is greater than or equal to the preset threshold, judge that the operating state of the lightning arrester is a danger; and if the resistive current is smaller than the preset threshold value, judging that the running state of the lightning arrester is good.
The third embodiment of the application discloses an arrester state online monitoring device, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize an arrester online monitoring method.
A fourth embodiment of the present application discloses a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, causes the processor to execute the online lightning arrester monitoring method.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the scope of protection thereof, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading this disclosure, those skilled in the art will be able to make various changes, modifications and equivalents to the embodiments of the invention, which fall within the scope of the appended claims.
Claims (13)
1. An on-line monitoring method for the state of an arrester is characterized by comprising the following steps:
acquiring a current waveform sequence and a voltage waveform sequence which are acquired by the lightning arrester according to preset sampling parameters; the preset sampling parameters comprise preset sampling time and preset sampling frequency;
judging the validity of the current waveform sequence and the voltage waveform sequence;
if the current waveform sequence and the voltage waveform sequence are effective, acquiring fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence;
calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence;
comparing the resistive current of the arrester with a preset threshold value, and if the resistive current is greater than or equal to the preset threshold value, judging that the operating state of the arrester is dangerous; and if the resistive current is smaller than the preset threshold value, judging that the running state of the lightning arrester is good.
2. The method of claim 1, further comprising:
and if the current waveform sequence and/or the voltage waveform sequence are/is invalid, resetting the sampling time, and acquiring the current waveform sequence and the voltage waveform sequence which are acquired by the lightning arrester according to the reset sampling time and the preset sampling frequency.
3. The method of claim 1, wherein the determining the validity of the current waveform sequence comprises:
acquiring a grouped current waveform sequence, wherein the grouped current waveform sequence is equally grouped and acquired according to the current waveform sequence and the number of current samples;
obtaining a time sequence, wherein time samples in the time sequence correspond to current samples in the current waveform sequence;
acquiring a grouping time sequence according to the time sequence and the grouping current waveform sequence; the time samples in the grouped time series correspond to the current samples in the grouped current waveform series;
acquiring an energy value of each grouped current waveform sequence according to the grouped current waveform sequence and the grouped time sequence;
acquiring an energy value sequence, wherein the energy value sequence is obtained according to the descending sequence of the energy values of the grouped current waveform sequences;
equally dividing the energy value sequence into two groups according to a sorting sequence to obtain a first energy sequence and a second energy sequence, wherein any energy value in the first energy sequence is larger than any energy value in the second energy sequence;
acquiring a first total energy and a second total energy, wherein the first total energy is the sum of energy values in the first energy sequence, and the second total energy is the sum of energy values in the second energy sequence;
acquiring an energy ratio of the first total energy to the second total energy;
if the energy ratio is greater than or equal to a preset energy ratio threshold, determining that the current waveform sequence is valid; and if the total energy value is smaller than the preset energy ratio threshold value, determining that the current waveform sequence is invalid.
4. The method of claim 1, wherein the step of determining the validity of the voltage waveform sequence comprises:
and judging the effectiveness of the voltage waveform sequence according to a similarity judgment method or an amplitude judgment method.
5. The method according to claim 1, wherein the obtaining an initial phase of a fundamental wave of the current waveform sequence and the voltage waveform sequence if the current waveform sequence and the voltage waveform sequence are valid comprises:
acquiring sampling points and the number of the sampling points in a power frequency period according to a preset sampling frequency;
acquiring a current waveform element group according to the sampling points and the number of the sampling points; the current waveform element group comprises current samples corresponding to sampling points of the number of the front sampling points in the current waveform sequence;
and acquiring a fundamental wave initial phase of the current waveform sequence according to a first preset formula and the current waveform element group.
6. The on-line monitoring method for the state of the lightning arrester according to claim 5, characterized in that the first preset formula is as follows:
wherein N is the number of sampling points and N is the number of sampling points,
is a current waveform element group, m is 1, 2, 3 … … N,
is a plurality of the number of the optical fibers,
the phase angle of (2) is the initial phase of the fundamental wave of the current waveform sequence.
7. The on-line monitoring method for the state of the lightning arrester according to claim 6, characterized in that the method further comprises:
acquiring a voltage waveform element group according to the sampling points and the number of the sampling points; the voltage waveform element group comprises voltage samples corresponding to sampling points of the number of front sampling points in the voltage waveform sequence;
and acquiring a fundamental wave initial phase of the voltage waveform sequence according to the voltage waveform element group.
8. The method according to claim 1, wherein the calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence comprises:
obtaining an effective value of the current waveform sequence according to a second preset formula;
and acquiring the resistive current of the lightning arrester by adopting a third preset formula according to the primary phase of the fundamental wave of the current waveform sequence, the primary phase of the fundamental wave of the voltage waveform sequence and the effective value of the current waveform sequence.
9. The on-line monitoring method for the state of the lightning arrester according to claim 8, characterized in that the second preset formula is as follows:
wherein, I is an effective value of the current waveform sequence, N is the number of sampling points, I (I) is the current waveform sequence, and I is 1, 2, and 3 … … N.
10. The on-line monitoring method for the state of the lightning arrester according to claim 9, characterized in that the third preset formula is:
wherein, I R Is the resistive current of the lightning arrester,
is the primary phase of the fundamental wave of the voltage waveform sequence,
is the primary phase of the fundamental wave of the current waveform sequence.
11. An arrester state on-line monitoring device, its characterized in that includes:
the lightning arrester monitoring system comprises a waveform sequence acquisition module, a data acquisition module and a data processing module, wherein the waveform sequence acquisition module is used for acquiring a current waveform sequence and a voltage waveform sequence which are acquired by the lightning arrester according to preset sampling parameters; the preset sampling parameters comprise preset sampling time and preset sampling frequency;
the validity judging module is used for judging the validity of the current waveform sequence and the voltage waveform sequence;
the fundamental wave initial phase acquisition module is used for acquiring the fundamental wave initial phases of the current waveform sequence and the voltage waveform sequence if the current waveform sequence and the voltage waveform sequence are effective;
the resistive current calculation module is used for calculating the resistive current of the lightning arrester according to the primary phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence;
the lightning arrester state judging module is used for comparing the resistive current of the lightning arrester with a preset threshold value, and if the resistive current is greater than or equal to the preset threshold value, judging that the operating state of the lightning arrester is dangerous; and if the resistive current is smaller than the preset threshold value, judging that the running state of the lightning arrester is good.
12. An on-line arrester state monitoring device comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement an on-line arrester monitoring method according to any one of claims 1 to 10.
13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, causes the processor to carry out a lightning arrester on-line monitoring method according to any one of claims 1-10.
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