CN114966272A - Lightning arrester state online monitoring method, device, equipment and medium - Google Patents

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

A method, device, equipment and medium for on-line monitoring of arrester status

technical field

The present application relates to the technical field of arrester state detection, in particular to a method, device, equipment and medium for on-line monitoring of the arrester state.

Background technique

The metal oxide arrester is mainly composed of zinc oxide valve plates in series, and has very good nonlinear volt-ampere characteristics. Metal oxide arresters have a large resistivity under power frequency voltage, which can quickly and effectively suppress power frequency current; under lightning overvoltage, their resistivity will become very small, and they can discharge lightning current well, and are widely used in power systems. Overvoltage protection. However, with the increase of operation time of metal oxide arresters and the defects of their products, the problems of damping and aging of arresters under operating voltage are becoming more and more prominent.

For metal oxide arresters, in the prior art, technicians usually perform preventive tests on the state of the arrester at regular intervals to determine whether the arrester is faulty. However, due to the rapid development of arrester failures, it is impossible to grasp the operating status of the arrester in real time using this method, so that it is impossible to repair or replace the arrester in time to reduce the harm caused by the failure. , to ensure its safe operation.

SUMMARY OF THE INVENTION

In order to solve the problem in the prior art that when the state of the arrester is detected, the technicians perform detection tests at regular intervals, so that the operating state of the arrester cannot be grasped in real time, so that the damage cannot be dealt with in time when the hazard occurs, causing danger and property damage. Disclosed are a method, device, equipment and medium for on-line monitoring of arrester status.

A first aspect of the present application discloses a method for on-line monitoring of arrester status, including:

acquiring the current waveform sequence and the voltage waveform sequence collected by the arrester according to preset sampling parameters; the preset sampling parameters include 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 valid, acquiring the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence;

Calculate the resistive current of the arrester according to the initial 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, if the resistive current is greater than or equal to the preset threshold, it is determined that the operating state of the arrester is dangerous; if the resistive current is less than the preset threshold Threshold value, it is judged that the arrester is in good operating state.

Optionally, the method further includes:

If the current waveform sequence and/or the voltage waveform sequence are invalid, the sampling time is reset, and the current waveform sequence and the voltage waveform sequence collected by the arrester according to the reset sampling time and preset sampling frequency are acquired.

Optionally, the method further includes: judging the validity of the current waveform sequence, including:

obtaining a grouped current waveform sequence, and the grouped current waveform sequence is obtained in equal groups according to the number of current samples according to the current waveform sequence;

acquiring a time series, the time samples in the time series correspond to the current samples in the current waveform series;

obtaining a grouped time series according to the time series and the grouped current waveform sequence; the time samples in the grouped time series correspond to the current samples in the grouped current waveform sequence;

Obtain the energy value of each grouped current waveform sequence according to the grouped current waveform sequence and the grouped time sequence;

Obtaining a sequence of energy values, the sequence of energy values is obtained in descending order according to the energy values of the current waveform sequences of each group;

Divide the energy value sequence into two equal groups according to the sorting order, obtain a first energy sequence and a second energy sequence, and any energy value in the first energy sequence is greater than any energy value in the second energy sequence ;

obtaining a first total energy and a second total energy, where the first total energy is the sum of the energy values in the first energy sequence, and the second total energy is the sum of the energy values in the second energy sequence;

obtaining 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, it is determined that the current waveform sequence is valid; if the total energy value is less than the preset energy ratio threshold, it is determined that the current waveform sequence is invalid.

Optionally, the method further includes: judging the validity of the voltage waveform sequence;

The said judging the validity of the voltage waveform sequence includes:

According to the similarity determination method or the amplitude determination method, the validity of the voltage waveform sequence is determined.

Optionally, if the current waveform sequence and the voltage waveform sequence are valid, acquiring the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence, including:

According to the preset sampling frequency, obtain the sampling points and the number of sampling points in a power frequency cycle;

According to the sampling point and the number of sampling points, a current waveform pixel group is obtained; the current waveform pixel group includes the current samples corresponding to the sampling points of the previous sampling point number in the current waveform sequence;

According to the first preset formula and the current waveform element group, the initial phase of the fundamental wave of the current waveform sequence is obtained.

Optionally, the first preset formula is:

为电流波形素组，m＝1、2、3……N，

为复数，

的相角为电流波形序列的基波初相位。Among them, n is the sampling point, N is the number of sampling points,

is the current waveform element group, m=1, 2, 3...N,

is plural,

The phase angle of is the initial phase of the fundamental wave of the current waveform sequence.

Optionally, the method further includes:

According to the sampling points and the number of sampling points, a voltage waveform pixel group is obtained; the voltage waveform pixel group includes the voltage samples corresponding to the sampling points of the previous sampling point number in the voltage waveform sequence;

According to the voltage waveform element group, the initial phase of the fundamental wave of the voltage waveform sequence is obtained.

Optionally, calculating the resistive current of the arrester according to the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence includes:

obtaining the effective value of the current waveform sequence according to the second 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, a third preset formula is used to obtain the resistive current of the arrester.

Optionally, the second preset formula is:

Among them, I is the effective value of the current waveform sequence, N is the number of sampling points, I(i) is the current waveform sequence, i=1, 2, 3...N.

Optionally, the third preset formula is:

为电压波形序列的基波初相位，

为电流波形序列的基波初相位。Among them, _IR is the resistive current of the arrester

is the initial phase of the fundamental wave of the voltage waveform sequence,

is the initial phase of the fundamental wave of the current waveform sequence.

A second aspect of the present application discloses an on-line monitoring device for the state of an arrester, comprising:

a waveform sequence acquisition module, used for acquiring the current waveform sequence and the voltage waveform sequence collected by the arrester according to preset sampling parameters; the preset sampling parameters include preset sampling time and preset sampling frequency;

a validity judging module for judging the validity of the current waveform sequence and the voltage waveform sequence;

a fundamental wave initial phase acquisition module, configured to acquire the fundamental wave initial phase of the current waveform sequence and the voltage waveform sequence if the current waveform sequence and the voltage waveform sequence are valid;

A resistive current calculation module, configured to calculate the resistive current of the arrester according to the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence;

The arrester state determination module is used to compare the resistive current of the arrester with a preset threshold, and if the resistive current is greater than or equal to the preset threshold, determine that the operation state of the arrester is dangerous; if the resistance If the current is less than the preset threshold, it is determined that the arrester is in good operating state.

A third aspect of the present application discloses an on-line monitoring device for an arrester state, comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a method for on-line monitoring of the arrester.

A fourth aspect of the present application discloses a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the processor causes the processor to execute the method for online monitoring of a lightning arrester.

The present application discloses a method, device, equipment and medium for on-line monitoring of arrester status. The method includes: acquiring a current waveform sequence and a voltage waveform sequence collected by the arrester according to preset sampling parameters; the preset sampling parameters include preset sampling parameters. time and preset sampling frequency; determine the validity of the current waveform sequence and the voltage waveform sequence; if the current waveform sequence and the voltage waveform sequence are valid, obtain the fundamental wave of the current waveform sequence and the voltage waveform sequence initial phase; according to the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence, calculate the resistive current of the arrester; compare the resistive current of the arrester with the preset threshold, if the resistive current is greater than or equal to the preset threshold, it is determined that the operation state of the arrester is dangerous; if the resistive current is less than the preset threshold, it is determined that the operation state of the arrester is good.

The application can grasp the operating status of the arrester in real time, detect whether the arrester is faulty, and respond in time when the fault occurs, reduce the probability of danger, and reduce the property loss caused by the arrester failure; the application collects voltage data and current by screening the voltage data and current Data, the calculation results are more accurate when calculating the resistive current, which can reflect the operating status of the arrester in real time, and issue an alarm in time to prevent the occurrence of hazards; this application discloses the method for determining the validity of the current waveform and the validity of the voltage waveform to avoid meaningless. Data calculation, improving the efficiency of calculating resistive current.

Description of drawings

In order to illustrate the technical solutions of the present application more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative work, the Additional drawings can be obtained from these drawings.

1 is a scene application diagram of a method for on-line monitoring of arrester status disclosed in an embodiment of the present application;

FIG. 2 is a schematic flowchart of a method for on-line monitoring of a state of an arrester disclosed in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a device for on-line monitoring of arrester status disclosed in an embodiment of the application;

In the figure: 1-conductor or busbar; 2-surge arrester; 3-voltage acquisition terminal; 4-current acquisition terminal; 5-edge computing node; 6-monitoring system background; 7-remote client; 8-low-power wireless communication Agreement; 9-Power Intranet.

Detailed ways

In order to solve the problem in the prior art that when the state of the arrester is detected, the technicians perform detection tests at regular intervals, so that the operating state of the arrester cannot be grasped in real time, so that the damage cannot be dealt with in time when the hazard occurs, causing danger and property damage. Disclosed are a method, device, equipment and medium for on-line monitoring of arrester status.

The application is applied in the scenario shown in FIG. 1 , and the application process includes: the monitoring system background 6 issues a collection instruction to the edge computing node 5 , and sets the collection time point or collection method.

After receiving the instruction, the edge computing node 5 sends the acquisition instruction to the voltage acquisition terminal 3 and the current acquisition terminal 4 through the low-power wireless communication protocol 8 broadcast channel.

After receiving the synchronous collection instruction, the voltage collection terminal 3 and the current collection terminal 4 collect voltage and current data synchronously, and upload the data to the edge computing node 5 .

The edge computing node 5 analyzes the collected data, and after the validity is determined, calculates related parameters such as resistive current, and uploads it to the monitoring system background 6 for storage.

For the arrester whose resistive current exceeds the standard, the monitoring system background 6 will issue an alarm message in time, and at the same time push the alarm signal to the mobile phone of the inspection personnel.

The monitoring system background 6 communicates with the edge computing node 5 through the power intranet, and the edge computing node 5 and the voltage acquisition terminal 3 and the current acquisition terminal 4 perform data exchange through a low-power wireless communication protocol.

To grasp the operation of the arrester, it is necessary to measure the resistive current of the arrester. In the prior art, the resistive current of the arrester is mainly measured by online monitoring of the full current and resistive current components, on-site live measurement of the full current and resistive current components, and infrared monitoring of the temperature of the arrester. The online monitoring method has high real-time performance, which is helpful for timely detection of arrester defects and prevents them from developing into serious accidents, which is the trend of the development of arrester condition monitoring technology. However, in the current data and voltage data obtained by this method, there are often incomplete waveform data and invalid data, which cannot be screened in the prior art, the calculated resistive current results of the arrester are inaccurate, and the calculation efficiency is low. Therefore, it is impossible to accurately grasp the operating state of the arrester.

The first embodiment of the present application discloses a method for on-line monitoring of arrester status. Referring to the schematic flowchart shown in FIG. 2 , the method includes:

Step 101: Acquire a current waveform sequence and a voltage waveform sequence collected by the arrester according to preset sampling parameters; the preset sampling parameters include a preset sampling time and a preset sampling frequency.

Step 102, judging the validity of the current waveform sequence and the voltage waveform sequence; specifically, including:

A grouped current waveform sequence is obtained, and the grouped current waveform sequence is obtained in equal groups according to the number of current samples according to the current waveform sequence.

A time series is acquired; time samples in the time series correspond to current samples in the series of current waveforms. Assuming that the current waveform sequence is [x ₁ , x ₂ , x ₃ , x ₄ ... x _n ], there are a total of n samples, and the time sequence corresponding to the waveform sequence is [t ₁ , t ₂ , t ₃ , t ₄ ... t _n ], a total of n samples, the judgment implementation process is as follows:

According to the time series and the grouped current waveform sequence, a grouped time series is obtained; the time samples in the grouped time series correspond to the current samples in the grouped current waveform sequence; the current waveform sequence [x ₁ ,x ₂ , x ₃ , x ₄ ... x _n ] A total of n samples are equally divided into k parts (generally k is 10, and divided by n is an integer), each of which has a total of n/k samples, for example:

Divide the waveform sequence [x ₁ ,x ₂ ,x ₃ ,x ₄ ...x _n ] into 10 equal parts, and the divided samples are [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} ...xn].

According to the grouped current waveform sequence and the grouped time series, the energy value of each grouped current waveform sequence is obtained; after dividing the current sequence into equal parts, the energy of each sample is calculated according to the following method:

For example, if the waveform sequence [x ₁ ,x ₂ ,x ₃ ,x ₄ ...x _n ] has a total of n samples and is divided into k parts, the first part 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 parts are calculated in turn, and denoted as E ₁ , E ₂ , E ₃ . . . E _k in turn.

An energy value sequence is obtained, and the energy value sequence is obtained in descending order according to the energy values of the current waveform sequences of each group.

Divide the energy value sequence into two equal groups according to the sorting order, obtain a first energy sequence and a second energy sequence, and any energy value in the first energy sequence is greater than any energy value in the second energy sequence . That is to say, according to the sorting order, the energy value sequence can be divided into two groups in the order of energy value from high to low in an equal number. For example, there are 10 energy values, and the energy value can be ranked in the top five. Divide into one group, and divide the energy values ranked in the bottom five into another group.

份相加，计算总能量，记作E_q，后

份相加，记作E_h。Obtain the first total energy and the second total energy; the first total energy is the sum of the energy values in the first energy sequence; the second total energy is the sum of the energy values in the second energy sequence; the front of the permuted energy

Add up the parts to calculate the total energy, denoted as E _q , then

The parts are added and recorded as E _h .

Obtain the energy ratio of the first total energy to the second total energy; divide the total energy calculated above and record as

If the energy ratio is greater than or equal to a preset energy ratio threshold, it is determined that the current waveform sequence is valid; if the total energy value is less than the preset energy ratio threshold, it is determined that the current waveform sequence is invalid. Specifically, if eq≥λ (λ is an integer greater than or equal to 5, and generally takes a value of 10), the waveform is valid; otherwise, the waveform is invalid.

The judging the validity of the voltage waveform sequence also includes:

According to the similarity determination method or the amplitude determination method, the validity of the voltage waveform sequence is determined.

Using the similarity determination method specifically includes: collecting the voltage waveform by using the voltage monitoring terminal directly installed on the transmission line body, and recording the waveform sequence X at the initial electrification time. At this time, the voltage waveform amplitude is A, and the voltage waveform at the initial electrification time is The reference voltage.

The collected voltage waveform sequence is denoted 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 integrated as X={x ₁ , x ₂ , x ₃ , x ₄ …x _n }, Y={y ₁ , y ₂ , y ₃ , y ₄ …y _n }.

Calculate the Pearson correlation coefficient between the voltage waveforms collected by the integrated lines, denoted as ρ _xy1 , and the calculation method is as follows:

Circularly sort out the voltage waveform, place the last element in the voltage waveform array collected by the line at the first position of the array, form a new array, and then calculate the Pearson correlation coefficient with the reference voltage, which is recorded as ρ _xy2 respectively; (for example: the array X ＝{x ₁ ,x ₂ ,x ₃ ,x ₄ ...x _n } changes according to the above rules to form a new array X ₁ ={x _n ,x ₁ ,x ₂ ,x ₃ ,x ₄ ...x _n-1 }, Then calculate the Pearson correlation coefficient between the new array X ₁ and the unchanged array Y, the calculation method is the same as that of step 3, and the calculated result is recorded as ρ _xy 2).

Then change the new array according to step (4), and repeat n times, and finally obtain ρ _xy1 , ρ _xy2 , ρ _xy3 , ρ _xy 4...ρ _xyn .

Compare |ρ _xy1 |, |ρ _xy2 |, |ρ _xy3 |, |ρ _xy4 |...|ρ _xyn |, and take the maximum value as the effective correlation coefficient, denoted as ρ _{xy has} .

则本次电压采集终端所采集到的数据进入幅值判定，反之，为无效，直接舍弃。Determine the effective correlation coefficient ρ _xy between the voltage data and the reference voltage data during normal operation, if

Then the data collected by the voltage collection terminal this time enters the amplitude judgment, otherwise, it is invalid and directly discarded.

The amplitude judgment method is used, which specifically includes: according to the relevant requirements of the power system, the operating voltage of the transmission line does not exceed ±10% of the rated voltage. Therefore, this method is mainly based on this principle, and the voltage waveform sequence collected by the system is judged. The specific judgment Methods as below:

If the voltage level of the line installed by the voltage monitoring is WkV line (such as 110kV, 220kV line, etc.), the single-phase voltage is recorded as

Note that the waveform sequence acquired by the voltage sensor is X={x ₁ , x ₂ , x ₃ , x ₄ …x _n }.

Windowing: Add a window with a length of s sampling points to the voltage waveform (l is a positive integer), and determine whether the value of the sampling point in the window is within the range of [0.9*V, 1.1*V], if so, the waveform directly It is determined to be valid, if not, go to the next step.

Sliding a window with a length of s backwards, with a step length of 1 sampling point, and using the sliding window method to determine the validity of the waveform.

The above steps are repeated until the window contains the sampling point at the end of the voltage waveform sequence. If all the sampling points in the sliding window do not meet the above conditions, the waveform is determined to be invalid. On the contrary, if there is a waveform that meets the conditions, the waveform is valid.

If the current waveform sequence and/or the voltage waveform sequence are invalid, the sampling time is reset to obtain the current waveform sequence and the voltage waveform sequence of the arrester.

Step 103: If the current waveform sequence and the voltage waveform sequence are valid, acquire the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence. Specifically, it includes: acquiring the initial phase of the fundamental wave of the current waveform sequence.

According to the preset sampling frequency fs/Hz, the sampling points and the number of sampling points in one power frequency period are obtained; the number of points corresponding to one power frequency period (ie 20ms) is N, and N=0.02*fs.

According to the sampling points and the number of sampling points, a current waveform pixel group is obtained; the current waveform pixel group includes current samples corresponding to the sampling points of the previous sampling point number in the current waveform sequence.

According to the first preset formula and the current waveform element group, the initial phase of the fundamental wave of the current waveform sequence is obtained.

The first preset formula is:

为电流波形素组，m＝1、2、3……N，

为复数，

的相角为电流波形序列的基波初相位。电流波形序列总长度M应不小于2N，电流数组长度及采样率均与电流波形序列长度相同。Among them, n is the sampling point, N is the number of sampling points,

is the current waveform element group, m=1, 2, 3...N,

is plural,

The phase angle of is the initial phase of the fundamental wave of the current waveform sequence. The total length M of the current waveform sequence should not be less than 2N, and the current array length and sampling rate are the same as the current waveform sequence length.

The acquiring the initial phase of the current waveform sequence and the voltage waveform sequence if the current waveform sequence and the voltage waveform sequence are valid, further includes: acquiring the fundamental wave initial phase of the voltage waveform sequence.

According to the sampling point and the number of sampling points, a voltage waveform pixel group is obtained; the voltage waveform pixel group includes the voltage samples corresponding to the sampling points of the previous sampling point number in the voltage waveform sequence.

According to the voltage waveform element group, the initial phase of the fundamental wave of the voltage waveform sequence is obtained. Calculate the initial phase of the fundamental wave of the voltage waveform sequence according to the same method as when calculating the initial phase of the current waveform sequence.

If the current waveform sequence and/or the voltage waveform sequence are invalid, the sampling time is reset, and the current waveform sequence and the voltage waveform sequence collected by the arrester according to the reset sampling time and preset sampling frequency are acquired.

Step 104: Calculate the resistive current of the arrester according to the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence. Specifically, including:

According to the second preset formula, the effective value of the current waveform sequence is obtained.

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, a third preset formula is used to obtain the resistive current of the arrester.

The second preset formula is:

Among them, I is the effective value of the current waveform sequence, N is the number of sampling points, I(i) is the current waveform sequence, i=1, 2, 3...N.

The third preset formula is:

为电压波形序列的基波初相位，

为电流波形序列的基波初相位。Among them, _IR is the resistive current of the arrester,

is the initial phase of the fundamental wave of the voltage waveform sequence,

is the initial phase of the fundamental wave of the current waveform sequence.

Step 105: Compare 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, determine that the operation state of the arrester is dangerous; The preset threshold is used to determine that the arrester is in a good operating state.

In the on-line monitoring method of the arrester state of the present application, the current waveform sequence and the voltage waveform sequence collected by the arrester according to preset sampling parameters are acquired; the preset sampling parameters include preset sampling time and preset sampling frequency; and the current waveform sequence is judged and the validity of the voltage waveform sequence; if the current waveform sequence and the voltage waveform sequence are valid, obtain the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence; according to the current waveform sequence and the voltage waveform sequence Calculate the resistive current of the arrester; compare the resistive current of the arrester with a preset threshold, if the resistive current is greater than or equal to the preset threshold, determine that the arrester is operating The state is dangerous; if the resistive current is less than the preset threshold, it is determined that the arrester is in a good operating state.

The application can grasp the operating status of the arrester in real time, detect whether the arrester is faulty, and respond in time when the fault occurs, reduce the probability of danger, and reduce the property loss caused by the arrester failure; the application collects voltage data and current by screening the voltage data and current Data, the calculation results are more accurate when calculating the resistive current, which can reflect the operating status of the arrester in real time, and issue an alarm in time to prevent the occurrence of hazards; this application discloses the method for determining the validity of the current waveform and the validity of the voltage waveform to avoid meaningless. Data calculation, improving the efficiency of calculating resistive current.

The second embodiment of the present application discloses an on-line monitoring device for the state of a surge arrester. Referring to the schematic structural diagram shown in FIG. 3 , the device includes:

The waveform sequence acquisition module 10 is used for acquiring the current waveform sequence and the voltage waveform sequence collected by the arrester according to preset sampling parameters; the preset sampling parameters include preset sampling time and preset sampling frequency.

The validity judgment module 20 is used for judging the validity of the current waveform sequence and the voltage waveform sequence.

The fundamental wave initial phase acquisition module 30 is configured to acquire the fundamental wave initial phase of the current waveform sequence and the voltage waveform sequence if the current waveform sequence and the voltage waveform sequence are valid.

The resistive current calculation module 40 is configured to calculate the resistive current of the arrester according to the initial phase of the fundamental wave of the current waveform sequence and the voltage waveform sequence.

The arrester state determination module 50 is configured to compare 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, determine that the arrester operating state is dangerous; When the resistive current is less than the preset threshold, it is determined that the arrester is in good operating state.

A third embodiment of the present application discloses an on-line monitoring device for a lightning arrester state, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a method for on-line monitoring of the arrester.

A fourth embodiment of the present application discloses a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the processor causes the processor to execute the method for online monitoring of a lightning arrester.

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, etc.) 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 in 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 the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: Those skilled in the art can still make various changes, modifications or equivalent replacements to the specific embodiments of the invention after reading the present invention, but these changes, modifications or equivalent replacements are all within the protection scope of the pending claims of the invention.

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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