CN103106341B - A kind of direct current protection accident intelligent analysis method and system - Google Patents

Abstract

The invention discloses a kind of direct current protection accident intelligent analysis method and system, its method comprises the following steps: step 1: the signal file and the recorded wave file that import fault moment; Step 2: be the discernible form of computing machine by the Data Analysis in recorded wave file; Step 3: screen everything signal, chooses the protect types of action; Step 4: carry out intellectual analysis, according to criterion given in advance, automatically extracts relevant recorder data, and analyzes protection act process and whether meet expected design, and for the data segment meeting criterion, system adopts the mode of automatic sectional drawing, industrial accident analysis report.Adopt the present invention can greatly strengthen first-line staff's fault signature identification capability, effectively improve field staff's direct current protection accident treatment effeciency.

Description

A kind of direct current protection accident intelligent analysis method and system

Technical field

The present invention relates to HVDC (High Voltage Direct Current) transmission system, in particular a kind of direct current protection accident intelligent analysis method and system.

Background technology

In the face of know-why is complicated, broad covered area, the relay protection accident that the frequency of occurrences is high, how Fast Identification Accident Characteristic, timely fault point, recovers faulty equipment as early as possible and normally runs, and is a current direct current transportation one line production work difficult problem in the urgent need to address.

Found by literature search; the domestic and international majority of the research to direct current protecting is the research of single protection algorism, principle at present; almost do not relate to the correlative study of high voltage direct current protection exception automatic analysis method, and the just phoenix feathers and unicorn horns especially of complete research can be carried out simultaneously to the accident treatment technology under Siemens TDC, Nan Rui PCS-9550, Siemens SIMADYND tri-kinds of DC protection systems.

For the direct current protection accident that scene occurs, along with a series of accident alarm signal (being called for short SER) and failure wave-recording signal (being called for short TFR), the quantity of information that these signals comprise is very abundant.A general trip accident, alarm signal reaches hundreds of bar, but real useful to us signal, only have more than 10 bars; And Fault Recorder Information is just more, cloudlike in a failure wave-recording file of wide extra-high voltage, just contain the fault datas such as up to ten thousand electric currents, voltage, pole control, protection switch amount.In traditional incident processing procedure, can only rely on and manually screen, find out SER and TFR relevant with fault analysis, waste time and energy, and easily because the experience difference of analyst causes the inaccurate of analysis result.

Therefore, prior art awaits further developing and improving.

Summary of the invention

The object of the present invention is to provide a kind of direct current protection accident intelligent analysis method and system, be intended to solve the problem that existing direct current protection accident does not have to realize Intelligent treatment.

Technical scheme of the present invention is as follows:

A kind of direct current protection accident intelligent analysis method, it comprises the following steps:

Step 1: the signal file and the recorded wave file that import fault moment;

Step 2: be the discernible form of computing machine by the Data Analysis in recorded wave file;

Step 3: screen everything signal, chooses the protect types of action;

Step 4: carry out intellectual analysis, according to criterion given in advance, extracts relevant recorder data automatically; and analyze protection act process and whether meet expected design, for the data segment meeting criterion, system adopts the mode of automatic sectional drawing; industrial accident analysis report, points out possible trouble spot.

First data transformations wherein, be the discernible form of computing machine is electrical power system transient exchanges data common format by the Data Analysis in recorded wave file by described direct current protection accident intelligent analysis method.

First data transformations wherein, be the discernible form of computing machine is Excel form by the Data Analysis in recorded wave file by described direct current protection accident intelligent analysis method.

Described direct current protection accident intelligent analysis method, wherein, carries out screening to everything signal and have employed multiplex screening method, specifically comprise the following steps:

Step 31: protection title screening;

Step 32: action consequence keyword search;

Step 33: according to Protection criteria locking recorder data.

Described direct current protection accident intelligent analysis method, wherein, the concrete steps that system carries out intellectual analysis comprise:

Step 41: system, according to drawing protection act information, finds out corresponding criterial equation, it is converted into the form calculating function identification;

Step 42: system has the data volume of special computing to process to some, is converted into the polynary amount needed in criterion by single amount;

Step 43: system starts to record ripple scanning, according to the result of screening, scans, to find the record wave band meeting operating criterion to the recorder data used;

Step 44: scanning recorder data out and criterion contrast by system, makes the conclusion protecting whether correct operation.

Described direct current protection accident intelligent analysis method, wherein, is divided into method criterial equation being converted into the form calculating function identification described in step 41: equation standardization and equation resolve two processes.

Described direct current protection accident intelligent analysis method, wherein, system has the data volume of special computing to process to some specifically to comprise: carry out effective value calculating, carry out the calculation of voltage jump gauge, carry out the effective value of alternating current and calculate.

Described direct current protection accident intelligent analysis method; wherein; the concrete grammar that system carries out recording ripple scanning is analysis result according to SER signal; first find out calculative criterion; find corresponding switching value title according to this criterion again, in recorded wave file, inquire about this switching value place passage, and the moment finding switching value to change; and with this moment for starting point, relevant analog quantity channel is scanned.

A kind of direct current protection accident intelligent analysis system, wherein, comprising:

Import transmission module on the signal file of fault moment and the recorder data of recorded wave file;

The signal file that identification imports and recorded wave file are text formatting or non-textual format, if data are then inputted SER signal analyse block and screen by text formatting, if non-textual format, then protection system and protection act title load module are activated, and require the recorder data identification module of the title of initiatively input protection system and protection act;

The protection system of the title of input protection system and protection act and protection act title load module;

Screen, filter out the SER signal analyse block of protection act;

The protection act title extraction module of their title is extracted from the protection act filtered out;

First data format is converted to the unified data layout identified of computing machine, then goes out Data Analysis and the screening module of the criterion of this protection act according to the protection name query that the protection title automatically extracted or active input;

Find by the scanning of record ripple the record wave band meeting operating criterion, and to contrast in the criterion with the protection act inquired, make the recorder data analysis module of the conclusion protecting whether correct operation;

By mouse event mechanism by the defective segment interception module being presented at Information of equation result of calculation;

By the Trouble Report output module that the result analyzed derives with WORD form, point out possible trouble spot.

Described direct current protection accident intelligent analysis system, wherein, the defective segment interception module of system can intercept the oscillogram that a section meets criterion automatically, comprises the result of calculation of instantaneous value, effective value and each formula in data.

Beneficial effect of the present invention: the present invention passes through based on software programming technique; according to criterion, signal in advance; automatic resolve fault record ripple; define the method for all kinds of direct current protecting fault of intellectual analysis; greatly strengthen field staff's fault signature identification capability, effectively improve field staff's direct current protection accident treatment effeciency.

Accompanying drawing explanation

Fig. 1 is system chart provided by the invention.

Fig. 2 is the analytical approach process flow diagram of the system that the present invention carries.

Embodiment

For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.

See Fig. 1, described direct current protection accident intelligent analysis system comprises: transmission module, recorder data identification module, SER signal analyse block, protection act title extraction module, protection system and protection act title load module, Data Analysis and screening module, recorder data analysis module, defective segment interception module and Trouble Report output module on recorder data.The system of above-mentioned module composition is mainly divided into four major parts, wherein, on recorder data, transmission module, recorder data identification module, SER signal analyse block, protection act title extraction module and protection system and protection act title load module have been used for data importing; Data Analysis and screening module have been used for Data Analysis and data screening; Recorder data analysis module, defective segment interception module and Trouble Report output module have been used for intellectual analysis.

On described recorder data, transmission module is used for the signal file of fault moment and the importing of recorded wave file; Described recorder data identification module is for identifying that the signal file of importing and recorded wave file are text formatting or non-textual format, if data are then inputted SER signal analyse block and screen by text formatting, if non-textual format, such as picture, then protection system and protection act title load module are activated, and require the title of initiatively input protection system and protection act; Described protection system and protection act title load module are used for the title of input protection system and protection act; Described SER signal analyse block is used for screening, and has filtered out which protection act; Described protection act title extraction module is used for the title extracting them from the protection act filtered out; Described Data Analysis and screening module for first data format being converted to the unified data layout identified of computing machine, then go out the criterion of this protection act according to the protection name query that the protection title automatically extracted or user initiatively input; Described recorder data analysis module is used for finding by the scanning of record ripple the record wave band meeting operating criterion, and contrasts in the criterion with the protection act inquired, and makes the conclusion protecting whether correct operation; Described defective segment interception module is used for by mouse event mechanism equation result of calculation being presented at Information; Described Trouble Report output module is used for the result analyzed to derive with WORD form.

See Fig. 2, the analytical approach of direct current protection accident intelligent analysis system provided by the invention comprises the following steps:

Step 1: the signal file and the recorded wave file that import fault moment;

Step 2: be the discernible form of computing machine by the Data Analysis in recorded wave file;

Step 3: screen everything signal, chooses the protect types of action;

Step 4: according to criterion given in advance, automatically extracts relevant recorder data, and analyzes protection act process and whether meet expected design; for the data segment meeting criterion; system adopts the mode of automatic sectional drawing, industrial accident analysis report, points out possible trouble spot.

Because fault recorder data amount is huge, and the data format of different DC engineerings is different, so first system needs to adopt data identification technology in step s 2, recorder data is resolved to discernible form, and then screens.

The first analytic method provided by the invention is: be first electrical power system transient exchanges data common format by data transformations, its analyzing step is:

Steps A 21: file reading flows in internal memory, namely reports an error if file does not exist;

Steps A 22: the recorder data object (ci) of a newly-built ComtradeImpl type;

Steps A 23: carry out the data in file reading with behavior unit, after reading single file data, take comma as separator partition data, obtains a character string dimension arr;

Steps A 24: the form according to configuration file defines, what the first row stored is name of station, characteristic sum amendment time, what the second row stored is quantity and the type of passage, is ensuingly followed successively by analog channel information list, stator channel information list, line frequency, speed change sampling, sampling rate information, the first data point time, trigger point time, data file class and time mark multiplier coefficients;

Steps A 25: define integer (int) object count and record currently read which row;

Steps A 26: use BufferedReader to read configuration file stream with behavior unit circle, judge count, if 0, namely arr storage of array is name of station, characteristic sum amendment time; If 1, namely arr storage of array is quantity and the type of passage, and traversal arr array, is stored into corresponding data structure in object ci respectively, the like, until run through document flow, the configuration file reading of namely recording ripple is complete;

Steps A 27: read configuration file complete, starts read data files and flows in internal memory, namely report an error if file does not exist;

Steps A 28: because data file stores data with scale-of-two, so need the data come in units of byte in file reading, is stored in byte arrays fileByte object;

Steps A 29: calculate the byte number circulate shared by a record according to the quantity of passage;

Steps A 210: a newly-built type is the record data object (sampleData) of SampleData;

Steps A 211: circulation byte arrays fileByte, in units of circulate, read corresponding data to sampleData, after having read a record, store in the sampleDataList in sampleData to ci, the like, until document flow runs through, the data file of namely recording ripple reads complete.So far, store the partial data of a recorded wave file inside ComtradeImpl object ci.

The second analytic method provided by the invention is: be first Excel form by data transformations, the parsing comparing first method Excel file form is simply many, its primary format is a bivariate table structure, each row represents a passage, every a line represents a time point, therefore read in this Excel form when program is resolved by the POI assembly of Java, represent passage according to row, the form that row represents time point just can parse whole recorder data.

Its analyzing step is:

Step B21: system reads xls file and flows in internal memory, namely reports an error if file does not exist;

Step B22: the recorder data object (ci) of a newly-built ComtradeImpl type;

Step B23: create Workbook object wb according to Excel file stream, because the data of some systems are only stored in first job table, so obtain first job table object sheet here, to carry out the data in file reading for unit with row (row), each cell is a data point;

The configuration information for record ripple that step B24: worksheet sheet the first eight row stores, reads the first eight row successively and is stored into data structure corresponding in ci;

Step B25: a newly-built type is the record data object (sampleData) of SampleData;

Step B26: circulate from the 9th row, every behavior record, is stored into sampleData, after having read a record, store the sampleDataList in sampleData to ci, the like, until document flow runs through, the data file of namely recording ripple reads complete.So far, store the partial data of a recorded wave file inside ComtradeImpl object ci.

When carrying out step 3, system is in the face of ten hundreds of fault-signals and fault recorder data stream, and how finding out the information that we need fast and accurately, is the step affecting field accident process rapidity and correctness key.The present invention have employed multiplex screening in this link, specifically comprises the following steps:

Step 31: protection title screening.In each protection act process, main event is all generally the message of a certain protection act, as Sudden Changing Rate protection, and traveling-wave protection etc.; After determining main line, the correctness of follow-up screening can be ensured.

Step 32: action consequence keyword search.After protection act, necessarily along with certain action consequence, as tripping operation, power, bipolar balance movement etc. fall; Range of search can be reduced further;

Step 33: according to Protection criteria locking recorder data.Operating criterion that every protection has self fixing, as pole differential protection (87DCM), operating criterion is | IdH-IdN|>150A, time delay 5ms.When system is through the screening of first, second layer; when 87DCM protection act having been detected; then be automatically associated to the IdH(high voltage bus DC current in recorder data), IdN(neutral bus DC current) two record ripple passages, record ripple scanning after substantially increasing, equation resolve and the efficiency of analysis.

Intelligence incident management system, can from mass data by the screening of above-mentioned three steps, accurately picks out trouble-signal and recorder data that we want, effective exclusive PCR information.

After the preparation of three step screenings above, system starts to carry out intellectual analysis, and its analytical approach comprises the following steps:

Step 41: system according to drawing protection act information, can find out corresponding criterial equation, it is converted into the form calculating function identification;

Step 42: system has the data volume of special computing to process to some so that by collection in worksite to single amount be converted into the polynary amount needed in criterion;

Step 43: system starts to record ripple scanning, according to the result of screening, scans, to find the record wave band meeting operating criterion to the recorder data used;

Step 44: scanning recorder data out and criterion contrast by system, makes the conclusion protecting whether correct operation.

To the criterial equation described in step 41, the method it being converted into the form calculating function identification is divided into two processes, is divided into: equation standardization and equation are resolved.

So-called equation standardization refers to, equation user provided is organized into the cannonical format that computer system can be understood.Because can be more random when user writing mode, may occur in equation arbitrary space, Chinese bracket or English bracket, absolute value expression be ABS function sometimes, sometimes be the mathematical notation of two vertical line, this skimble-scamble Formula Input Technology simply cannot be identified by computer program, and this just needs to standardize to equation.And non trivial solution analyse process be exactly by standardization after mathematical formulae be converted to computer program, to carry out data processing.

In the present invention, equation standardization mainly contains following agreement:

1, not there is space in equation

2, all functions use capitalization to represent, such as MIN, MAX etc.

3, absolute value uses two vertical line to represent

4, definite value uses Δ to represent

5, relation " with " use & & to represent, relation "or" uses or to represent

Equation after standardization employs the expression parsing engine of a set of IKExpression by name to carry out treatment and analysis.From surface, as long as the parameter in formula and formula is passed to expression parsing engine, just can obtain final result of calculation, greatly facilitate the resolving of numerous complicated formula, also save the working time.

In the recorded wave file of each straight-flow system; what provide is all the record ripple of single numerical quantities, as: DC voltage UdL, DC current IdL etc., but need in some Protection criteria to use polynary amount; as: voltage jump amount du/dt, valve star top-cross stream current effective value IacY etc.For these particular amount, the present invention processes according to certain operational method, as: effective value calculates, and voltage jump gauge is calculated, and the effective value of alternating current calculates.

Calculate about effective value: for ac analog, such as IacY etc., what record in recorder data is the instantaneous value of this amount, when carrying out data and calculating, instantaneous value does not have obvious meaning (especially when making comparisons with D. C. value), needs calculating to be converted to effective value.Although the three-phase alternating current that China uses is the sine and cosine waveform of standard, this is theoretic result.In reality, due to the problem such as precision, external interference of surveying instrument, can not convert in strict accordance with the waveform of sine and cosine, and when system jam, waveform there will be obvious shake, and various reasons all makes the effective value of ac analog, can not calculate according to theoretical formula.Following relation is had in theory between the effective value of sine and cosine ripple and maximal value:

$I_{\mathrm{RMS}}=\sqrt{2}\·I_{\mathrm{MAX}}$ Formula 1

In formula: I _rMSeffective value, I _mAXit is maximal value.

The effective value (i.e. root-mean-square value) of random waveform, can be obtained by following integration:

$I_{\mathrm{RMS}}=\sqrt{\frac{1}{T}\underset{0}{\overset{T}{\∫}}{i}^2\left(t\right)\·\mathrm{dt}}$ Formula 2

In formula: I _rMSbe effective value, T is the cycle, and i (t) is the instantaneous value of t.

But such computing method are also only effective to continuous function.Clearly in reality, the data got by record ripple must be discrete on time point, therefore need to turn to discrete for above formula:

$I_{\mathrm{RMS}}=\sqrt{\frac{1}{T}\underset{0}{\overset{T}{\mathrm{\Σ}}}{i}^2\left(n\right)}$ Formula 3

In formula: I _rMSbe effective value, T is the cycle, and i (n) is sampled data in the n moment and requires that n is the positive integer power of 2.

As long as the recorder data in a cycle is substituted into formula 3, effective value corresponding on certain time point just can be calculated.

Calculate about voltage jump gauge: in the recorder data file of some, do not record to obtain the data of du/dt, therefore need system to calculate voluntarily.Du/dt is a micro component, therefore need to get a Minimum-time, according to expensive wide record wave frequency 6400Hz, calculate its cycle is 0.156ms, can meet minimum condition, therefore when calculating du/dt, system obtains the UdL numerical value that two are closed on sampled point, do difference after again divided by 0.156ms cycle and get final product, as follows:

$\mathrm{du}/\mathrm{dt}=\frac{\mathrm{UdL}\left(n\right)-\mathrm{UdL}(n+1)}{0.156}$ Formula 4

In formula: UdL (n) is the sampled data in n moment.

Calculating about the effective value Iac of alternating current: system also calculative amount be exactly Iac(Uac in like manner).In recorded wave file, IacY and IacD of subitem can be recorded, i.e. valve star side A item electric current, B item electric current and C item electric current, and side, valve angle A item electric current, B item electric current and C item electric current.Go for Iac and first must calculate to obtain the valve star side electric current of not phase-splitting and side, valve angle electric current.Computing formula is as follows:

$\mathrm{IacY}=\frac{\mathrm{IacY}{A}_{\mathrm{RMS}}+\mathrm{IacY}{B}_{\mathrm{RMS}}+\mathrm{IacY}{C}_{\mathrm{RMS}}}{2}$ Formula 5

$\mathrm{IacD}=\frac{\mathrm{IacD}{A}_{\mathrm{RMS}}+\mathrm{IacD}{B}_{\mathrm{RMS}}+\mathrm{IacD}{C}_{\mathrm{RMS}}}{2}$

After obtaining IacY and IacD, the computing formula of Iac is:

Iac=max (IacY, IacD) formula 6

Wherein, record ripple scanning described in step 43 is the analysis result according to SER signal, system can first find out calculative criterion, corresponding switching value title is found according to this criterion, this switching value place passage is inquired about in recorded wave file, and find the moment that switching value changes, and with this moment for starting point, relevant analog quantity channel is scanned.The length of scanning is approximately the length of criterion Outlet time, such one side is limited to data volume on the some passages needed for criterion, and by the change of switching value, the calculative record ripple time period can also be shortened, significantly reduce the data volume participating in computing, significantly improve computational analysis efficiency.

Process to this step, can obtain criterial equation, and required recorder data or calculate the data of coming according to recorder data.The process of analysis just becomes the scanning to recorder data.

Take time point as index, scanning recorder data, obtains the numerical value of analog quantity on each time point, substitutes into formulae discovery.If meet criterion requirement, then check Outlet time, if Outlet time is 0, then this protection exit action is described; If Outlet time is not 0, then record this point data, continue to calculate next point, until result of calculation does not meet criterion, or Outlet time arrives.

More than calculate the correct situation of protection act.If the situation of protection incorrect operation, system does not just have switching value can reference, can only get whole recorder data and calculate, to judge whether that the record wave plate section meeting definite value and Outlet time exists.

For the situation having logical relation in criterion, the result of each equation can be calculated respectively, then get corresponding logical calculated.For the criterion of segmentation, just each section is used as one independently criterion treat, criterion divides how many sections, just carries out how many times scanning to recorder data, to judge that specifically which segment protect there occurs action.

After analysis completes, the defective segment interception module of system can intercept the oscillogram that a section meets criterion automatically, comprises the result of calculation of instantaneous value, effective value (if present) and each formula in data.The mouse event mechanism provided by Rickshaw, can be obtained current mouse position, just can be obtained the concrete coordinate of mouse point in oscillogram by this position.The position at x coordinate place is drawn a vertical line to show pointer, and y coordinate (i.e. the value of each passage) is presented in the Information below figure.The x-axis pointer of each block graphics can be followed mobile simultaneously, and each group also has an Information being used for showing equation result of calculation, and data wherein also can move with cursor and change.

After the failure wave-recording meeting criterion shows, the Trouble Report output module of system also provides the function deriving report.Click the button of deriving report, first can eject dialog box and allow user confirm to generate the content of report, can revise as required, then click and determine, the analysis just can deriving Word form reports, can greatly save follow-up go out time of analysis report.

Tradition is relied on the accident analyzing process of manually carrying out by the present invention, by Data Analysis and software program method, changes automatic analysis process into, is all at home and abroad a kind of innovation and breakthrough in accident treatment technology.This D.C. high voltage transmission protection exception disposal system is according to onsite application situation, and project achievement greatly strengthen first-line staff's fault signature identification capability, effectively improves field staff's direct current protection accident treatment effeciency.

In direct current protection accident processing procedure in the past; we also do not have the analysis and processing method of set of system; always search secondary circuit, software logic at the scene after running into emergency episode temporarily; also to take a long time to analyze protection record ripple and coherent signal simultaneously; deficiency in cognition; have a strong impact on the efficiency of our accident treatment, be unfavorable for that recovering faulty equipment as early as possible puts into operation.

After this system is applied to scene, user only needs to import corresponding SER and TFR data, and this system can protect whether correct operation according to the criterion automatic analysis of setting in advance, automatically can also generate failure analysis report.While saving the manual analysis time, for quick position fault is fixed, restorer runs and provides strong technical guarantee.

Such as, ± 500kV Converter of Guangzhou Converter Station SER reports " converter unit protection commutation failure (87CFP) is detected ", and bipolar commutation failure occurs then.After corresponding TFR and SER is imported " direct current protection accident intelligent analysis system " by operations staff; the switching value that system automatic analysis is corresponding and analog quantity; draw the conclusion of protection correct operation soon, and generate the analysis report of set form, consistent with manual analysis conclusion.In addition, system, according to historical empirical data, directly indicates possible trouble spot, and the reason that has an accident is looked into very soon in help scene, originally needs the accident treatment that just can complete for 12 hours, has only used more than 3 hour specifically.

Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.

Claims (6)

1. a direct current protection accident intelligent analysis method, is characterized in that, comprises the following steps:

Step 1: the signal file and the recorded wave file that import fault moment;

Step 2: be the discernible form of computing machine by the Data Analysis in recorded wave file;

Step 3: screen everything signal, chooses the protect types of action;

Step 4: carry out intellectual analysis, according to criterion given in advance, extracts relevant recorder data automatically, and analyze protection act process and whether meet expected design, for the data segment meeting criterion, system adopts the mode of automatic sectional drawing, industrial accident analysis report, points out possible trouble spot; Wherein, the concrete steps that system carries out intellectual analysis comprise:

Step 41: system, according to the protection act information obtained, finds out corresponding criterial equation, it is converted into the form calculating function identification;

Step 42: system has the data volume of special computing to process to some, is converted into the polynary amount needed in criterion by single amount;

Step 43: system starts to record ripple scanning, according to the result of screening, scans, to find the record wave band meeting operating criterion to the recorder data used;

Step 44: scanning recorder data out and criterion contrast by system, makes the conclusion protecting whether correct operation.

2. direct current protection accident intelligent analysis method according to claim 1, is characterized in that, is divided into method criterial equation being converted into the form calculating function identification described in step 41: equation standardization and equation resolve two processes.

3. direct current protection accident intelligent analysis method according to claim 1, is characterized in that, system has the data volume of special computing to process to some specifically to comprise: carry out effective value calculating; Carry out the calculation of voltage jump gauge and carry out the effective value calculating of alternating current.

4. direct current protection accident intelligent analysis method according to claim 1; it is characterized in that; the concrete grammar that system carries out recording ripple scanning is analysis result according to SER signal; first find out calculative criterion; find corresponding switching value title according to this criterion again, in recorded wave file, inquire about this switching value place passage, and the moment finding switching value to change; and with this moment for starting point, relevant analog quantity channel is scanned.

5. a direct current protection accident intelligent analysis system, is characterized in that, comprising:

Import transmission module on the signal file of fault moment and the recorder data of recorded wave file;

The signal file that identification imports and recorded wave file are text formatting or non-textual format, if data are then inputted SER signal analyse block and screen by text formatting, if non-textual format, then protection system and protection act title load module are activated, and require the recorder data identification module of the title of initiatively input protection system and protection act;

The protection system of the title of input protection system and protection act and protection act title load module;

Screen, filter out the SER signal analyse block of protection act;

The protection act title extraction module of their title is extracted from the protection act filtered out;

First data format is converted to the unified data layout identified of computing machine, then goes out Data Analysis and the screening module of the criterion of this protection act according to the protection name query that the protection title automatically extracted or active input;

Find by the scanning of record ripple the record wave band meeting operating criterion, and to contrast with the criterion of the protection act inquired, make the recorder data analysis module of the conclusion protecting whether correct operation;

By mouse event mechanism, equation result of calculation is presented at the defective segment interception module of Information;

By the Trouble Report output module that the result analyzed derives with WORD form, point out possible trouble spot.

6. direct current protection accident intelligent analysis system according to claim 5, is characterized in that, the defective segment interception module of system can intercept the oscillogram that a section meets criterion automatically, comprises the result of calculation of instantaneous value, effective value and each formula in data.