CN106207986B - Substation's bus differential protection anti-incorrect manipulation deadlock method and apparatus based on wavelet theory - Google Patents
Substation's bus differential protection anti-incorrect manipulation deadlock method and apparatus based on wavelet theory Download PDFInfo
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- CN106207986B CN106207986B CN201610826534.9A CN201610826534A CN106207986B CN 106207986 B CN106207986 B CN 106207986B CN 201610826534 A CN201610826534 A CN 201610826534A CN 106207986 B CN106207986 B CN 106207986B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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Abstract
The invention discloses a kind of fool proof blocking method of substation's bus differential protection and device based on wavelet theory, method includes the following steps: electric current, the voltage to primary system are sampled respectively to obtain the numerical value of electric current and voltage and waveform；The numerical value of the electric current of sampling is compared with the action value of setting, to determine whether to start bus differential protection；The voltage of sampling is subjected to composite voltage calculating, and judges whether voltage is normal；The electric current of use and voltage waveform are subjected to wavelet analysis respectively, judge whether waveform is normal；And whether normal and waveform normally exports trip operation to execute locking bus differential protection or female difference according to voltage.In the present invention, voltage is abnormal after composite voltage calculates and waveform is normal, then is latched bus differential protection, and female difference outlet is not tripped, to solve the problems, such as that electrical secondary system maloperation in the prior art causes female difference outlet tripping.
Description
Technical field
The present invention relates to a kind of fool proof blocking method of substation's bus differential protection and blocking devices.
Background technique
Currently used microcomputer type bus differential protection is started using jump-value of current, female poor in some cases in order to prevent
False protection, what the mode for recycling composite voltage to be latched worked.
Certain substation 220kV switch combining unit more changes jobs, since staff is by related pressing plate at the end of work
(including soft pressing plate) sequentially miscarrys, and causes bus differential protection malfunction, causes large area blackout.It is primary main when accident occurs
System is up, not only fault-free but also without low-voltage, and composite voltage should be in blocking at this time, and female difference ought to be prevented to protect
Shield outlet tripping.
In existing bus differential protection technology, the outlet of bus differential protection, this side are generally latched with the principle of composite voltage
Formula can be latched bus differential protection well under normal circumstances, but in system concussion or Secondary Circuit of Potential Transformer broken string etc.
In the case of, the condition of lock release is just met, compound voltage lockout releases at this time, and if the mistake of secondary circuit occurs at this time
When operating (such as above-mentioned accident) or secondary loop of mutual inductor broken string, bus differential protection will export tripping, to electricity
Force system and power consumer all cause damages, and the combining unit in intelligent station, the dress for exactly merging electric current, voltage
It sets, combining unit maintenance, it is meant that electric current, voltage circuit have exited bus differential protection simultaneously, and bus differential protection loses composite voltage
Locking, if do not restored by regulation step in recovery process, very likely results in bus differential protection malfunction.
In implementing the present invention, it may, present inventors believe that being answered for important protection equipment as bus differential protection
The reliability of continuous improvement protection, make protective device this it is dynamic have to move, what should not be moved not tamper centainly.To avoid pressing
Plate mistake throws the generation again for operating and causing bus differential protection action, it is necessary on the basis of existing compound voltage lockout mode,
Introduce other closedown modes.
Summary of the invention
The purpose of the present invention is to provide a kind of fool proof locking side of substation's bus differential protection based on wavelet theory
Method throws bus differential protection action caused by operation to solve pressing plate mistake.
The object of the invention is also to provide the fool proof blocking device of substation's bus differential protection based on wavelet theory,
To solve bus differential protection action caused by the secondary operations such as pressing plate mistake throwing.
For this purpose, one aspect of the present invention provides a kind of substation's bus differential protection blocking method based on wavelet theory, including
The starting link and locking link of bus differential protection, wherein wavelet analysis is at least used in the locking link of bus differential protection, to female poor
Protection act is controlled, comprising the following steps: is sampled electric current, the voltage of primary system to obtain electric current and electricity respectively
The step of numerical value and waveform of pressure；The step of voltage, current waveform are analyzed, identify fault waveform；And according to identification
To fault waveform bus differential protection action is controlled the step of.
Further, the starting link of above-mentioned bus differential protection includes: the action value by the numerical value of the electric current of sampling and setting
It is compared, if bus differential protection does not start, otherwise bus differential protection starts within the scope of the action value of setting.
Further, above-mentioned blocking method further includes being calculated in the locking link of bus differential protection using composite voltage to judge
Whether voltage is normal, wherein is controlled according to composite voltage fault waveform that is whether normal and recognizing to bus differential protection action
System.
According to another aspect of the present invention, it is fool proof to provide a kind of substation's bus differential protection based on wavelet theory
Blocking method, comprising the following steps: electric current, the voltage of primary system are sampled respectively to obtain the numerical value of electric current and voltage
And the step of waveform one；The numerical value of the electric current of sampling is compared with the action value of setting, if in the action value range of setting
Interior, then bus differential protection does not start, otherwise starts the step of bus differential protection two；The voltage of sampling is subjected to composite voltage calculating, and
Judge the whether normal step 3 of voltage；The electric current of sampling and voltage waveform are subjected to wavelet analysis respectively, identify fault waveform
The step of four；And fault waveform that is whether normal according to voltage and recognizing is jumped to execute locking bus differential protection or female difference outlet
The step of lock acts five, wherein if voltage or waveform alternative one are normal, it is latched bus differential protection, if the two is abnormal,
Execute female difference outlet tripping.
Further, above-mentioned steps one further include being filtered to the electric current and voltage signal of acquisition.
The present invention also provides a kind of fool proof blocking device of substation's bus differential protection based on wavelet theory, packet
Include: sampling module is sampled respectively for electric current, the voltage to primary system to obtain the numerical value of electric current and voltage and wave
Shape；Bus differential protection starting module, for the numerical value of the electric current of sampling to be compared with the action value of setting, if in the dynamic of setting
Within the scope of work value, then bus differential protection does not start, otherwise starts bus differential protection；Compound voltage lockout module, the electricity for will sample
Pressure carries out composite voltage calculating, and judges whether voltage is normal；Small echo lock modules, for by the electric current used and voltage waveform
Wavelet analysis is carried out respectively, identifies fault waveform；Logic judgment module, for whether normal according to composite voltage and whether there is
Fault waveform determines the movement of bus differential protection outlet module, wherein if voltage or waveform alternative one are normal, determines to be latched
Bus differential protection determines female difference outlet tripping if the two is abnormal；And bus differential protection outlet module, for according to logic
The judgement result of judgment module is acted.
Further, above-mentioned sampling module is the bus differential protection device configured on primary system.
For current bus differential protection, existing shortcoming, the present invention are proposed using current more advanced in terms of locking
The locking of wavelet theory progress bus differential protection.Because small echo had not only been derived from the waveform of electric current but also had been derived from the waveform of voltage.When voltage returns
When road is broken, there is the waveform of electric current may determine that, when current loop broken string, there is voltage waveform may determine that；When system shake,
When meeting secondary circuit maloperation again, while there are electric current, voltage waveform can be for judgement, even if similar previous secondary returning occurs again
Road maloperation, as long as having any access of electric current all the way or voltage access, so that it may provide small echo criterion, bus differential protection completely can be with
It is latched, and is unlikely to malfunction tripping；When protection scope internal fault occurs, since the judgement of electric current, voltage waveform is
Failure, therefore unlocking make bus differential protection reliable trip.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is substation's bus differential protection fool proof locking side according to an embodiment of the invention based on wavelet theory
The flow chart of method；
Fig. 2 is the fool proof locking dress of substation's bus differential protection according to an embodiment of the invention based on wavelet theory
The structural block diagram set；
Fig. 3 is substation's bus differential protection fool proof locking according to another embodiment of the present invention based on wavelet theory
The flow chart of method；And
Fig. 4 is substation's bus differential protection fool proof locking according to another embodiment of the present invention based on wavelet theory
The structural block diagram of device.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 to Fig. 3 shows some embodiments according to invention.
The fool proof blocking method of substation's bus differential protection based on wavelet theory, comprising the following steps: to primary system
The step of electric current, the voltage of system are sampled respectively to obtain the numerical value of electric current and voltage and waveform one；By the electric current of sampling
Numerical value is compared with the action value of setting, if bus differential protection does not start, otherwise starting is female within the scope of the action value of setting
The step of difference protection two；The voltage of sampling is subjected to composite voltage calculating, and judges the whether normal step 3 of voltage；It will sampling
Electric current and voltage waveform carry out wavelet analysis respectively, judge the whether normal step 4 of waveform；And whether just according to voltage
Often and whether waveform is normally come five the step of executing locking bus differential protection or female difference outlet trip operation, wherein if voltage or wave
Shape alternative one is normal, then is latched bus differential protection, if the two is abnormal, executes female difference outlet tripping.
The detailed process of above-mentioned blocking method is as shown in figure 3, be described in detail as follows:
S21: it is sampled using existing bus differential protection device by electric current, the voltage signal to primary system；
S23: the electric current and voltage signal of step S21 sampling are filtered；
S25: the step S23 electric current obtained and voltage signal are extracted to the numerical value and waveform of electric current, voltage, next respectively
Execute step S27, step S29, step S31；
S27: the numerical value of the step S25 electric current obtained is compared with the action value of setting；
S39: next judging whether electric current is normal, if assert that electric current is normal within the scope of the action value of setting, if super
Action value out then assert that electric current is abnormal；If assert, electric current is abnormal, goes to step S47, if assert, electric current is abnormal,
Go to step S43；
S29: electric current that step S25 is obtained, voltage numerical value carry out composite voltage calculating, it is low pressure, negative in the step
Sequence, zero sequence three synthesize composite voltage, and thrin, which will reach condition, compound voltage lockout, to be opened, wherein the composite voltage meter
It is well known to those skilled in the art, therefore not to repeat here；
S37: according to the calculated result of step S29, judge whether voltage is normal, thens follow the steps S41 if normal, if not just
Often then follow the steps S45；
S31: wavelet analysis is carried out according to the waveform of the step S25 electric current obtained and voltage, extracts fault waveform, next
Execute step S35；
S35: according to the analysis of step S31 as a result, judging whether waveform is normal, and fault waveform is abnormal if it exists, then holds
Row step S45, if waveform normally thens follow the steps S41；
S41: if waveform of the voltage determined after composite voltage calculates normally or after wavelet analysis is normal,
It is latched bus differential protection.Wherein, wavelet analysis and composite voltage, which calculate relationship between the two, is: if voltage is normal, waveform one
It is fixed normal；If voltage is abnormal, the waveform after wavelet analysis is possible to normal, it is also possible to abnormal.According to this step, only
Both want to have one it is normal, then follow the steps S43--- locking bus differential protection, i.e., composite voltage calculate after voltage is abnormal and wave
Shape is normal, then is latched bus differential protection, and female difference outlet is not tripped, to solve to meet in the prior art after voltage calculates voltage not just
Often the problem of female difference outlet tripping；
S43: locking bus differential protection, female difference outlet can not trip at this time, and return step S21, continues to sample later, sampling frequency
The setting of rate follows existing compound voltage lockout mode；
S45: if voltage is abnormal and waveform is also abnormal, S47 is thened follow the steps；
S47: if electric current is abnormal, voltage is abnormal and waveform is also abnormal, S49 is thened follow the steps；And
S49: female difference outlet trip operation, primary system power-off are executed.
Blocking method according to the present invention is carried out using existing bus differential protection device by electric current, the voltage to system
Sampling, filtering obtain the electric current and voltage value and waveform of protective device needs, the current value that protector measuring is got with
The compulsory exercise value being pre-stored in protective device in advance is compared, if bus differential protection does not start within compulsory exercise value,
Otherwise just start bus differential protection.Under the premise of starting bus differential protection, bus differential protection device judges the state of a main system, such as
Within the specified scope or normal waveform, i.e. system is in normal operating condition to the waveform of fruit composite voltage or small echo, then will
It is latched bus differential protection, prevents bus differential protection from exporting tripping, bus differential protection is otherwise enable to export tripping.In the present invention, by
It is more accurate than compound voltage lockout in small echo closedown mode, it is thus possible to make up some defects of compound voltage lockout.
In one embodiment, as shown in Fig. 2, the fool proof locking dress of substation's bus differential protection based on wavelet theory
It sets, comprising:
Sampling module 10 is sampled respectively for electric current, the voltage to primary system to obtain the number of electric current and voltage
Value and waveform；
Bus differential protection starting module 20, for the numerical value of the electric current of sampling to be compared with the action value of setting, if
Within the scope of the action value of setting, then bus differential protection does not start, otherwise starts bus differential protection；
Compound voltage lockout module 30, just whether the voltage for that will sample carries out composite voltage calculating, and judge voltage
Often；
Small echo lock modules 30 judge that waveform is for the electric current used and voltage waveform to be carried out wavelet analysis respectively
It is no normal；
Logic judgment module 40, for according to whether composite voltage normal and whether waveform normally determines that bus differential protection goes out
The movement of mouth mold block, wherein if voltage or waveform alternative one are normal, determine to be latched bus differential protection, if the two is abnormal,
It determines female difference outlet tripping；And
Bus differential protection outlet module 50, for being acted according to the judgement result of logic judgment module.
For current bus differential protection, existing shortcoming, the present invention are proposed using current more advanced in terms of locking
The locking of wavelet theory progress bus differential protection.Because small echo had not only been derived from the waveform of electric current but also had been derived from the waveform of voltage.When voltage returns
When road is broken, there is the waveform of electric current may determine that, when current loop broken string, there is voltage waveform may determine that；When system shake,
When meeting secondary circuit maloperation again, while there are electric current, voltage waveform can be for judgement, even if occurring two as similar Tibet again
Minor loop maloperation, as long as having any access of electric current all the way or voltage access, so that it may provide small echo criterion, bus differential protection is complete
It can be latched, and be unlikely to malfunction tripping；When protection scope internal fault occurs, due to the judgement of electric current, voltage waveform
It is failure, therefore unlocking, make bus differential protection reliable trip.
Bus differential protection locked loop based on wavelet theory, Lai Shixian prevent bus differential protection malfunction, specific to cope with scene such as
Under:
1, when main system operates normally or system is shaken, since the waveform of system voltage at this time, electric current is normal
Sine wave, without fault waveform, and the difference stream inside female poor circuit is also in specified value hereinafter, so bus differential protection is motionless
Make.
2, when female poor secondary current circuit breaking or secondary circuit have maloperation, cause secondary differential current to increase, reach regulation
Action value and act, but since system operates normally, any fault wave is not measured in this blocking device based on wavelet theory
Shape information so being latched trip(ping) circuit, therefore will not export tripping.
3, when bus three-phase shortcircuit occurs, at this time due to being symmetrical short-circuit, composite voltage may not occur, but
Transcient short circuit time, electric current, the voltage of system are bound to change, at this moment since we use the technology of wavelet theory, so that it may
To capture the fault waveform information of instant of failure, therefore unlocking, so that bus differential protection normal exit is tripped.
4, bus three-phase shortcircuit occurs again when voltage circuit breaks, can not start due to voltage circuit power loss at this time multiple
Voltage blocking device is closed, but failure has been experienced using the variation that the protective device of wavelet theory has passed through fault current waveform
Presence, at this time will unlocking, allow bus differential protection direct export trip.
5, there is the big motor start-up of a batch again when concussion occurs for the system of normal operation simultaneously, system busbar voltage is very at this time
Low, close to three-phase shortcircuit, huge fluctuation occurs again for electric current, voltage, and current values may be very big, but system is normal at this time, therefore
Difference stream is little.System is symmetrical when due to concussion, is occurred without composite voltage, although while system fluctuation it is very big, do not have
Fault waveform occurs, it is regular variation, is unsatisfactory for small echo condition, even if the feelings of voltage circuit broken string occur again at this time
Condition, bus differential protection are also that will not export tripping.
During stating embodiment on the implementation, present inventors have recognized that wavelet analysis has in bus differential protection locking link
Independent utility can be used alone, and independent of the mode of compound voltage lockout, can also combine with other closedown modes makes
With, however considered based on reliability, preferably small echo locking is applied in combination with compound voltage lockout.
The blocking method of wavelet analysis is independently used to be described the locking link of substation's bus differential protection below.Its
In, locking link controls the link whether female difference outlet trips after referring to bus differential protection starting.
The blocking method uses wavelet analysis in the locking link of substation's bus differential protection, controls to bus differential protection action
System, comprising the following steps: electric current, the voltage of primary system are sampled respectively to obtain the numerical value of electric current and voltage and waveform
The step of；The step of voltage, current waveform are analyzed, fault waveform is extracted；And according to the fault wave recognized
The step of shape controls bus differential protection action.
The detailed process of above-mentioned blocking method is as shown in figure 3, be described in detail as follows:
S21: it is sampled using existing bus differential protection device by electric current, the voltage signal to primary system；
S23: the electric current and voltage signal of step S21 sampling are filtered；
S25: the step S23 electric current obtained and voltage signal are extracted to the numerical value and waveform of electric current, voltage, next respectively
Execute step S27, step S31；
S27: the numerical value of the step S25 electric current obtained is compared with the action value of setting；
S39: next judging whether electric current is normal, if assert that electric current is normal within the scope of the action value of setting, if super
Action value out then assert that electric current is abnormal；If assert, electric current is abnormal, goes to step S47, if assert, electric current is abnormal,
Go to step S43；
S31: wavelet analysis is carried out according to the waveform of the step S25 electric current obtained and voltage, extracts fault waveform, next
Execution step S35 is in this step sinusoidal waveform when electric current, voltage waveform are normal, and fault waveform is that following event occurs for bus
The corresponding waveform of barrier, bus-bar fault type are as follows: bus singlephase earth fault, two-phase short trouble, three phase short circuit fault, two
Phase ground short circuit failure, the present invention identifies the corresponding power waveform of above-mentioned bus-bar fault by wavelet analysis, that is, when breaking down
Current waveform and voltage waveform；
S35: according to the analysis of step S31 as a result, whether judging characteristic waveform is normal, abnormal fault wave if it exists
Shape thens follow the steps S47, if waveform normally thens follow the steps S43；
S43: locking bus differential protection, female difference outlet can not trip at this time, and return step S21, continues to sample later, sampling frequency
The setting of rate follows sample frequency used in existing compound voltage lockout；
S47: if electric current is abnormal, voltage is abnormal and waveform is also abnormal, S49 is thened follow the steps；And
S49: female difference outlet trip operation, primary system power-off are executed.
In the detailed process of blocking method shown in Fig. 3, bus differential protection starts link and determines mother by step S37 and S39
Whether difference starts, and starts if electric current is abnormal, if electric current is normally latched bus differential protection.Start link in bus differential protection, also
It can determine by other means whether bus differential protection starts.
In another embodiment, as shown in figure 4, the fool proof locking dress of substation's bus differential protection based on wavelet theory
It sets, comprising:
Sampling module 10 is sampled respectively for electric current, the voltage to primary system to obtain the number of electric current and voltage
Value and waveform；
Bus differential protection starting module 20, for the numerical value of the electric current of sampling to be compared with the action value of setting, if
Within the scope of the action value of setting, then bus differential protection does not start, otherwise starts bus differential protection；
Small echo lock modules 30 judge that waveform is for the electric current used and voltage waveform to be carried out wavelet analysis respectively
It is no normal；
Logic judgment module 40, for determining bus differential protection outlet module according to 30 judging result of small echo lock modules
Movement, wherein under the premise of starting bus differential protection, if waveform is normal, determine to be latched bus differential protection, if waveform is abnormal,
It determines female difference outlet tripping；And
Bus differential protection outlet module 50, for being acted according to the judgement result of logic judgment module.I.e. selectively
It is latched bus differential protection or enables female difference outlet tripping.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of substation's bus differential protection blocking method based on wavelet theory, starting link and block ring including bus differential protection
Section, which is characterized in that at least use wavelet analysis in the locking link of bus differential protection, bus differential protection action is controlled, wrap
Include following steps:
Electric current, the voltage of primary system are sampled respectively to obtain the numerical value of electric current and voltage and current waveform and electricity
The step of corrugating；
The step of voltage waveform and current waveform are analyzed, identify fault waveform；And
The step of bus differential protection action is controlled according to the fault waveform recognized,
Further include bus differential protection locking link calculated using composite voltage it is whether normal to judge voltage, and according to compound electric
Pressure fault waveform that is whether normal and recognizing controls bus differential protection action.
2. substation's bus differential protection blocking method according to claim 1 based on wavelet theory, which is characterized in that described
The starting link of bus differential protection includes: to be compared the numerical value of the electric current of sampling with the action value of setting, if in the dynamic of setting
Within the scope of work value, then bus differential protection does not start, otherwise bus differential protection starts.
3. a kind of fool proof blocking method of substation's bus differential protection based on wavelet theory, comprising the following steps:
The step of electric current, the voltage of primary system are sampled respectively to obtain the numerical value of electric current and voltage and waveform one；
The numerical value of the electric current of sampling is compared with the action value of setting, if female difference is protected within the scope of the action value of setting
Shield does not start, otherwise starts the step of bus differential protection two；
The voltage of sampling is subjected to composite voltage calculating, and judges the whether normal step 3 of voltage；It is characterized in that,
The step of electric current of sampling and voltage waveform are carried out wavelet analysis respectively, identify fault waveform four；And
Whether according to voltage trip operation normally is exported to execute locking bus differential protection or female difference with the fault waveform recognized
Step 5, wherein if voltage or waveform alternative one are normal, be latched bus differential protection, if the two is abnormal, it is female poor to execute
Outlet tripping.
4. substation's bus differential protection fool proof blocking method according to claim 3 based on wavelet theory, special
Sign is that the step 1 further includes being filtered to the electric current and voltage signal of acquisition.
5. a kind of fool proof blocking device of substation's bus differential protection based on wavelet theory characterized by comprising
Sampling module is sampled respectively for electric current, the voltage to primary system to obtain the numerical value of electric current and voltage and wave
Shape；
Bus differential protection starting module, for the numerical value of the electric current of sampling to be compared with the action value of setting, if in setting
Within the scope of action value, then bus differential protection does not start, otherwise starts bus differential protection；
Compound voltage lockout module, the voltage for that will sample carries out composite voltage calculating, and judges whether voltage is normal；
Small echo lock modules identify fault waveform for the electric current used and voltage waveform to be carried out wavelet analysis respectively；
Logic judgment module, for whether normal according to composite voltage and determine that bus differential protection exports with the presence or absence of fault waveform
The movement of module, wherein if voltage or waveform alternative one are normal, determine to be latched bus differential protection, if the two is abnormal,
Determine female difference outlet tripping；And
Bus differential protection outlet module, for being acted according to the judgement result of logic judgment module.
6. substation's bus differential protection fool proof blocking device according to claim 5 based on wavelet theory, special
Sign is that the sampling module is the bus differential protection device configured on primary system.
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| CN201610826534.9A CN106207986B (en) | 2016-09-14 | 2016-09-14 | Substation's bus differential protection anti-incorrect manipulation deadlock method and apparatus based on wavelet theory |
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| CN201610826534.9A CN106207986B (en) | 2016-09-14 | 2016-09-14 | Substation's bus differential protection anti-incorrect manipulation deadlock method and apparatus based on wavelet theory |
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| CN115795276B (en) * | 2022-11-22 | 2024-04-26 | 南京电力设计研究院有限公司 | Secondary circuit pressing plate state evaluation method based on wavelet analysis and machine learning |
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