CN115032560B - Fault recording starting method of power distribution terminal - Google Patents
Fault recording starting method of power distribution terminal Download PDFInfo
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- CN115032560B CN115032560B CN202210958168.8A CN202210958168A CN115032560B CN 115032560 B CN115032560 B CN 115032560B CN 202210958168 A CN202210958168 A CN 202210958168A CN 115032560 B CN115032560 B CN 115032560B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a fault recording starting method of a power distribution terminal. The method comprises the following steps: when any one wave recording unit starts recording, sending a wave recording starting frame to the other two wave recording units; when any one of the wave recording units receives the wave recording starting frame, judging whether the wave recording unit starts the wave recording, if not, starting the wave recording according to the wave recording starting time in the received wave recording starting frame; if the recording is started, selecting an earlier recording starting time from the recording starting time in the recording starting frame and the recording starting time of the recording, and restarting the recording. The invention can ensure that the wave recording starting time of the three wave recording units is consistent, so that the three wave recording units on the three-phase circuit can obtain three-phase wave recording data at the same time and accurately, and further, accurate and effective wave recording files at the same time can be formed.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a fault recording starting method of a power distribution terminal.
Background
The fault recording of the power system can automatically and accurately record the change conditions of the electric quantity and the state before and after the fault when the power system has the fault, and completely reflect the instant change after the fault and the action behavior of relay protection.
When a fault occurs in one phase or two phases of a circuit, such as a single-phase earth fault, a two-phase short circuit fault and the like, the phase voltage or current of the fault changes greatly, and equipment detects that the current or the electric field changes suddenly, so that wave recording is started; but non-fault phase voltage and current may not change much, and the current or the abrupt change of the electric field of other phases cannot be detected by the non-fault phase voltage and current, so that the self-starting wave recording is difficult; therefore, only recording data of a certain phase or two phases can be obtained, and zero stream data synthesized by incomplete recording data is incorrect, so that correct fault information is difficult to obtain.
Therefore, how to acquire accurate three-phase recording data at the same time to obtain accurate analysis of the line fault in the power system is very important.
Disclosure of Invention
The embodiment of the invention provides a fault recording starting method of a power distribution terminal, which aims to solve the problem that three recording units on a three-phase line are difficult to acquire three-phase recording data at the same time and accurately.
In a first aspect, an embodiment of the present invention provides a fault recording starting method for a power distribution terminal, where the method is used to control three recording units on a three-phase line to perform synchronous recording;
the method comprises the following steps:
when any one wave recording unit starts recording, sending a wave recording starting frame to the other two wave recording units;
when any wave recording unit receives a wave recording starting frame, judging whether the wave recording unit starts the wave recording, if the wave recording unit does not start the wave recording, starting the wave recording according to the wave recording starting time in the received wave recording starting frame;
if the recording is started, selecting an earlier recording starting time from the recording starting time in the recording starting frame and the recording starting time of the recording, and restarting the recording.
In a possible implementation manner, the manner of starting the wave recording by the wave recording unit includes remote control starting wave recording, self-starting wave recording, started wave recording, and zero-stream starting wave recording;
the remote control starting wave recording is that the wave recording unit starts wave recording according to a remote control wave recording command input from the outside;
the self-starting wave recording is carried out when the wave recording unit detects that the current or voltage change of the line exceeds the corresponding preset threshold value;
the started wave recording unit starts wave recording according to the received wave recording start frame sent by other wave recording units;
the zero current starting wave recording is the wave recording started by the wave recording unit when the change of the zero current effective value exceeds a preset zero current threshold value, and the zero current effective value is obtained by calculating current vector data of a three-phase line.
In one possible implementation manner, the three wave recording units are in wireless communication with the collecting unit;
the process of zero-flow starting wave recording comprises the following steps:
the collecting unit calculates a real-time zero-flow effective value according to the three-phase line current vector data received in real time and sent by the three wave recording units; when the zero stream effective value changes and exceeds a preset zero stream threshold value, a wave recording starting frame is sent to the three wave recording units; the wave recording starting time in the wave recording starting frame is the time of zero stream effective value change;
and each wave recording unit starts wave recording according to the wave recording starting time in the received wave recording starting frame.
In a possible implementation manner, the aggregation unit is further in wireless communication with a scheduling master station;
the process of remote control starting wave recording comprises the following steps:
when the collection unit receives a remote control wave recording command of the dispatching master station, sending a remote control wave recording starting frame to a remotely controlled wave recording unit according to the remote control wave recording command;
and the remote controlled wave recording unit starts wave recording according to the received remote controlled wave recording start frame.
In a possible implementation manner, after the wave recording unit detects that the line current or voltage variation exceeds the respective corresponding preset threshold, the method further includes:
judging whether the line has voltage and current before the line current or voltage changes;
if the circuit has no voltage and no current, the recording is not started.
In one possible implementation manner, the method further includes:
when the wave recording unit detects that the line voltage change exceeds a preset voltage threshold, detecting whether the line voltage change is a rising edge, and starting wave recording if the line voltage change is the rising edge;
if the line voltage changes to a falling edge, continuing to detect the line current and voltage, and if two continuous cycle lines have no voltage and no current, determining that power failure occurs and not starting wave recording; and if the power failure is not detected in ten continuous cycles, starting wave recording.
In one possible implementation manner, the method further includes:
when the starting mode of the wave recording unit is remote control starting wave recording, zero-stream starting wave recording, started wave recording or the wave recording unit detects that the line voltage change exceeds a preset voltage threshold value to start wave recording, the wave recording unit also sends a wave recording effective frame to the other two wave recording units and the collecting unit;
when the wave recording unit detects that the change of the line current exceeds a preset current threshold value to start wave recording, whether current exists in delay time is detected; if no current is detected in the delay time, transmitting a recording effective frame to the other two recording units and the collecting unit; if the current is detected to exist all the time in the delay time, the load fluctuation is determined, and the recording effective frame is not sent to the other two recording units and the collecting unit.
In one possible implementation manner, the method further includes:
when any one wave recording unit receives a wave recording effective frame, acquiring a wave recording effective identifier from the wave recording effective frame; when any one of the wave recording units comprises the effective wave recording identification of the three wave recording units, a wave recording acquisition file is formed;
when the collecting unit receives the effective wave recording identification of the three wave recording units, the wave recording acquisition files of the three wave recording units are obtained, the wave recording synthesis file is obtained according to the wave recording acquisition files, and the wave recording synthesis file is uploaded to the dispatching master station.
In a possible implementation manner, after the recording synthesis file is obtained, the collecting unit further judges whether the recording synthesis file is valid according to the recording acquisition file;
the collection unit judges whether the recording wave synthesis file is effective according to the recording wave acquisition file, and the method comprises the following steps:
if remote control starting wave recording, zero-current starting wave recording or line current change exceeding a preset current threshold value starting wave recording exist in any one wave recording acquisition file, enabling the wave recording synthetic file to be effective, and uploading the wave recording synthetic file to a scheduling master station;
if the three recording acquisition files are all one of the starting recording or the started recording when the line voltage change exceeds a preset voltage threshold, calculating the change of a zero flow effective value according to the zero flow effective values of a cycle before and after the starting time of recording, if the change of the zero flow effective value reaches the preset zero flow threshold, enabling the recording synthesis file to be effective, and uploading the recording synthesis file to a dispatching master station; if the zero stream effective value changes and does not reach the preset zero stream threshold value, the recording synthesis file is invalid, and the recording synthesis file is cleared.
In a possible implementation manner, the recording acquisition file is data of four cycles before the recording start time and eight cycles after the recording start time.
The embodiment of the invention provides a fault recording starting method of a power distribution terminal, which is used for controlling three recording units on a three-phase circuit to carry out synchronous recording, and when the recording units start recording, the recording starting frames are sent to the other two recording units to start the other two recording units, so that the three recording units can acquire recording data, and the three-phase recording data can be obtained; when any one of the recording units receives the recording start frame, whether the recording unit starts the recording is judged, the earlier recording start time is determined by comparing the recording start time, and the time of the three recording units can be the earlier recording start time, so that the recording start time of the three recording units is consistent, accurate and effective recording files can be formed at the same time, and accurate analysis on power failure is facilitated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an application scenario diagram of a fault recording starting method of a power distribution terminal according to an embodiment of the present invention;
fig. 2 is a flowchart of a first implementation of a fault recording starting method for a power distribution terminal according to an embodiment of the present invention;
fig. 3 is a flowchart of a second implementation of a fault recording starting method for a power distribution terminal according to an embodiment of the present invention;
fig. 4 is a flowchart of a third implementation of a fault recording starting method for a power distribution terminal according to an embodiment of the present invention;
fig. 5 is a flowchart of a fourth implementation of a fault recording starting method for a power distribution terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
The method for starting the fault recording of the power distribution terminal provided by the embodiment of the invention is used for controlling three recording units on a three-phase line to carry out synchronous recording, wherein the power distribution terminal can be a fault indicator, and particularly, the application scene diagram of the method for starting the fault recording of the power distribution terminal provided by the embodiment of the invention can be shown in fig. 1.
Specifically, each unit performs wireless communication by transmitting and receiving data frames; the data frame comprises a communication mode, an equipment address, a function code and a data area, wherein the communication mode comprises broadcasting and unicasting, the broadcasting can be sent to all units, equipment/units with the same equipment address can receive the broadcasting, and the unicasting is sent to a designated unit; different function codes represent different functions, for example, the recording start frame and the recording effective frame have respective function codes, and each unit performs different processing flows on the content of the data area according to the different function codes.
The perfect time synchronization system is arranged in the wave recording unit, so that the relative time difference among the three wave recording units can be kept within 2 microseconds, and therefore, the time for starting the wave recording by the three wave recording units is consistent only if the fault wave recording obtained by the three wave recording units is required to be ensured to be synchronous.
When the actual line breaks down, the three-phase break amount is not started at the same time, so that the starting time needs to be unified, and when any one wave recording unit is started, a wave recording starting frame containing the wave recording starting time is sent, which is specifically shown in table 1:
TABLE 1 wave recording start frame Table
The data area of the wave recording starting frame comprises a wave recording starting reason and a wave recording starting time, so that after being received by other wave recording units, the wave recording starting reason of the wave recording unit can be obtained, the wave recording starting time is determined, and starting or comparison is carried out according to the wave recording starting time; and finally, the three recording units start recording at the recording starting time of the recording unit which is started earliest.
Specifically, fig. 2 is a flowchart of a first implementation of a fault recording starting method for a power distribution terminal according to an embodiment of the present invention, which is detailed as follows:
in step S201, when any one of the recording units starts recording, a recording start frame is sent to the other two recording units.
Because the three recording units are respectively located on the three-phase line, the time for detecting the fault by the recording units may be different, or only one or two of the recording units detects the fault and starts, therefore, in order to ensure that the three recording units can start simultaneously, the started recording unit needs to send a recording start frame to the other two recording units, so that the three recording units can start.
The recording start frame comprises the recording start reason and the recording start time of the recording unit, so that other recording units can determine the recording start time conveniently, the recording start times of the three recording units are kept consistent, and finally a correct recording synthesis file can be obtained.
Step S202, when any wave recording unit receives the wave recording starting frame, whether the wave recording unit starts the wave recording or not is judged, and if the wave recording unit does not start the wave recording, the wave recording is started according to the wave recording starting time in the received wave recording starting frame.
In this embodiment, when the record ripples unit received the record ripples start frame, need judge whether self starts, if not start yet, then start the record ripples according to the record ripples start time in the record ripples start frame to can guarantee that three record ripples unit record ripples start time is unanimous, finally can synthesize accurate record ripples composite file.
Step S203, if the recording is started, selecting an earlier recording start time from the recording start time in the recording start frame and the recording start time of the recording, and restarting the recording.
In this embodiment, if the recording unit itself is already started, it indicates that the start time of the recording unit may be earlier, and in order to keep the start times of the three recording units consistent, it is necessary to compare the start time of recording in the recording start frame with the start time of recording itself, and determine the recording acquisition file with the earliest start time of recording, so as to ensure that the start times of recording of the three recording units are consistent. For example, if the a-phase recording unit a detects fault start at point 3, but the B-phase recording unit B is remotely controlled to start at point 2 and point 59, the recording start time is finally synchronized to point 2 and point 59, and the start time of the three recording units is guaranteed to be consistent.
The embodiment of the invention provides a fault recording starting method of a power distribution terminal, which is used for controlling three recording units on a three-phase circuit to carry out synchronous recording, and when the recording units start recording, the recording starting frames are sent to the other two recording units to start the other two recording units, so that the three recording units can acquire recording data, and the three-phase recording data can be obtained; when any one of the recording units receives the recording start frame, whether the recording unit starts the recording is judged, the earlier recording start time is determined by comparing the recording start time, and the time of the three recording units can be the earlier recording start time, so that the recording start time of the three recording units is consistent, accurate and effective recording files can be formed at the same time, and accurate analysis on power failure is facilitated.
In a possible implementation manner, the manner of starting the wave recording by the wave recording unit may include remote-control starting wave recording, self-starting wave recording, started wave recording, and zero-stream starting wave recording.
And the remote control starts wave recording, namely the wave recording unit starts wave recording according to a remote control wave recording command input from the outside.
Specifically, the process of starting recording by remote control may include: when the collection unit receives a remote control wave recording command of the scheduling master station, sending a remote control wave recording starting frame to a remotely controlled wave recording unit according to the remote control wave recording command; and the remote controlled wave recording unit starts wave recording according to the received remote controlled wave recording start frame.
When the dispatching master station needs to record a wave file, a remote control wave recording command is sent to the collecting unit, the collecting unit sends a remote control wave recording starting frame to the remotely controlled wave recording unit according to the remote control wave recording command, so that the remotely controlled wave recording unit can be controlled to start wave recording, after the remotely controlled wave recording unit starts wave recording, the wave recording starting frame is sent to the other two wave recording units, and therefore the three wave recording units start wave recording to obtain a wave recording acquisition file needed by the dispatching master station.
And the automatic wave recording is carried out when the wave recording unit detects that the current or voltage change of the line exceeds the corresponding preset threshold value.
When a fault occurs on the line, the voltage or the circuit on the line is changed, and when the wave recording unit detects that the voltage or current change exceeds the corresponding preset threshold value, the line is probably in fault, and wave recording is needed, so that the wave recording unit can start wave recording.
And starting wave recording for the wave recording unit according to the received wave recording starting frame sent by other wave recording units.
When the wave recording file receives the wave recording starting frames of other wave recording units, the wave recording file is started according to the wave recording starting time in the wave recording starting frames, and the three wave recording units are ensured to record waves according to the wave recording starting time.
And the zero-current starting wave recording is the wave recording started by the wave recording unit when the change of the zero-current effective value exceeds a preset zero-current threshold value, and the zero-current effective value is obtained by calculating current vector data of the three-phase line.
Specifically, the process of zero-stream start recording may include: the collecting unit calculates a real-time zero-flow effective value according to three-phase circuit current vector data received in real time and sent by the three wave recording units; when the zero stream effective value changes and exceeds a preset zero stream threshold value, sending a wave recording starting frame to the three wave recording units; the wave recording starting time in the wave recording starting frame is the time of the change of the zero stream effective value; and each wave recording unit starts wave recording according to the wave recording starting time in the received wave recording starting frame.
The three-phase wave recording unit can transmit line current vector data acquired by the three-phase wave recording unit to the collecting unit in real time, the collecting unit can calculate a real-time zero-current effective value through the received three-phase line current vector data, when the collecting unit monitors that the change of the zero-current effective value of the line exceeds a preset zero-current threshold value, the line is possibly in fault, and wave recording is needed, therefore, the collecting unit can send a wave recording starting frame to the three wave recording units, the wave recording starting time in the wave recording starting frame is the time when the zero-current changes, namely the time when the fault possibly occurs, and a follow-up scheduling master station can conveniently analyze the fault.
Further, the communication mode that the collecting unit sends the wave recording starting frame to the remotely controlled wave recording unit according to the remote wave recording command is unicast; the wave recording unit starts wave recording, the communication mode of sending the wave recording start frame to the other two wave recording units is broadcasting, and the equipment/units with the same equipment address can receive the wave recording start frame.
In a possible implementation manner, in a starting manner of self-starting recording, after the recording unit detects that a line current or voltage change exceeds a respective corresponding preset threshold, the method further includes:
judging whether the line has voltage and current before the line current or voltage changes; if the circuit has no voltage and no current, the recording is not started.
In this embodiment, if there is no voltage or no current on the line before the line current or voltage changes, it indicates that the line may have just been started, and the line current or voltage changes exceed the respective preset thresholds, but the line does not have a fault, so it is not necessary to start recording.
In a possible implementation manner, in a starting manner of self-starting wave recording, when the wave recording unit detects that the line voltage change exceeds a preset voltage threshold, it may further detect whether the line voltage change is a rising edge, and if the line voltage change is a rising edge, start wave recording. If the line voltage changes to a falling edge, continuing to detect the line current and voltage, and if two continuous cycle lines have no voltage and no current, determining that the power is off and not starting wave recording; if the power failure is not detected in ten continuous cycles, the recording is started.
In this embodiment, in the case where it is determined that the line is not just started, the line voltage changes to a rising edge, which indicates that a fault may occur, and therefore, recording needs to be started.
If the voltage of the line is detected to be changed into the falling edge, if no voltage and no current exist in the line, the current situation is that power failure occurs instead of other faults, so that the wave recording unit does not need to start wave recording; if no power failure is detected in the continuous ten cycles, it is described that the line voltage change at this time is not a power failure but a fault, and thus recording is required.
In a possible implementation manner, when the starting manner of the recording unit is remote control starting recording, zero-stream starting recording, started recording or the recording unit detects that the line voltage change exceeds a preset voltage threshold to start recording, the recording unit further sends a recording effective frame to the other two recording units and the collecting unit.
The starting mode is that the wave recording is started by remote control, which shows that the scheduling master station needs the wave recording composite file at the moment, so the started wave recording is always effective, and the wave recording effective frame is sent to the other two wave recording units and the collecting unit, thereby the wave recording starting of the wave recording unit is determined to be effective.
The starting mode is zero-flow starting wave recording, and the condition that the collecting unit detects that the change of the zero-flow effective value exceeds the threshold value indicates that a fault occurs in a line and wave recording is needed is met.
The starting mode is started recording, which means that the recording unit is started according to the recording starting frame sent by other recording units, so the method is also effective.
The starting mode is that when the recording unit detects that the line voltage change exceeds the preset voltage threshold value to start recording, the condition of whether power failure occurs or not is judged before the starting is determined, and the starting recording of the condition is possibly because of failure, so that the starting recording is also effective.
When the recording unit detects that the line current change exceeds a preset current threshold value to start recording, whether current exists in the delay time or not needs to be detected; if no current is detected in the delay time, transmitting a recording effective frame to the other two recording units and the collecting unit; if the current is detected to exist all the time in the delay time, the load fluctuation is determined, and the recording effective frame is not sent to the other two recording units and the collecting unit.
The starting mode is that when the recording unit detects that the change of the line current exceeds the preset current threshold value to start recording, the recording is possibly caused by load fluctuation, so that the detection is required to be continuously carried out in the delay time of the load fluctuation, and if no current exists in the line, the line is proved to have a fault at the moment, so that the recording is started effectively, and a recording effective frame is sent; if the current of the line is detected, the line current change exceeding the preset current threshold is probably caused by load fluctuation and is not a fault in the line, so the starting at the moment is invalid, and a recording valid frame is not sent.
Further, if the wave recording is started to be effective, the wave recording unit sends a wave recording effective frame to the other two wave recording units and the collecting unit, wherein the wave recording effective frame is specifically shown in table 2:
TABLE 2 recording effective frame table
The effective wave recording frame of each wave recording unit contains the effective wave recording identification of the wave recording unit, and meanwhile, the wave recording unit can also obtain the effective wave recording identification of the corresponding wave recording unit from the effective wave recording frames sent by other wave recording units and record the effective wave recording identification.
The present embodiment may further include:
when any one of the wave recording units receives the wave recording effective frame, acquiring a wave recording effective identifier from the wave recording effective frame; and when any one of the wave recording units comprises the effective wave recording identification of the three wave recording units, a wave recording acquisition file is formed.
Specifically, when any one of the wave recording units receives the effective wave recording identification of the three wave recording units, it is indicated that the start of each wave recording unit is effective, and therefore the wave recording units can form a wave recording acquisition file and upload the file.
When the collecting unit receives the effective wave recording identification of the three wave recording units, the wave recording acquisition files of the three wave recording units are obtained, the wave recording synthesis file is obtained according to the wave recording acquisition files, and the wave recording synthesis file is uploaded to the dispatching master station.
Specifically, when the collection unit receives the effective wave recording identifiers of the three wave recording units, the three wave recording units all receive the effective wave recording identifiers of the three wave recording units, and form a wave recording acquisition file, so that the collection unit can acquire the wave recording acquisition files of the three wave recording units at the moment, obtain a final wave recording synthesis file, and upload the final wave recording synthesis file.
In a possible implementation manner, after the recording composite file is obtained, the collecting unit may further determine whether the recording composite file is valid according to the recording acquisition file.
The collection unit judges whether the recording synthesis file is effective according to the recording acquisition file, and comprises the following steps:
if any one of the recording acquisition files has remote control starting recording, zero-current starting recording or line current change exceeds a preset current threshold value to start recording, the recording synthesis file is effective and is uploaded to the scheduling master station.
Specifically, the remote control starts the wave recording, which indicates that the scheduling master station needs the wave recording composite file at this time, so the started wave recording is certainly effective, and the final wave recording composite file is also certainly effective.
And starting wave recording at zero flow, wherein the collection unit detects that the change of the effective value of the zero flow exceeds a threshold value, and the fault occurs in a line, and wave recording is needed, so that the final wave recording synthetic file is also effective.
The line current changes and exceeds the preset current threshold value to start wave recording, when the starting is effective, whether the starting reason is load fluctuation is judged, and the collecting unit does not need to judge, so that the wave recording composite file at the moment is effective.
If the three recording acquisition files are all one of the starting recording or the started recording when the line voltage change exceeds a preset voltage threshold, calculating the change of a zero flow effective value according to the zero flow effective values of a cycle before and after the starting time of recording, if the change of the zero flow effective value reaches the preset zero flow threshold, enabling the recording synthesis file to be effective, and uploading the recording synthesis file to a dispatching master station; and if the change of the zero stream effective value does not reach a preset zero stream threshold value, the wave recording synthetic file is invalid, and the wave recording synthetic file is cleared.
Specifically, when the line voltage change exceeds a preset voltage threshold value, starting recording is carried out, whether the voltage change caused by power failure exceeds the preset voltage threshold value is judged, and the electric field of the line collected by a recording unit is easy to fluctuate due to the influence of environmental factors such as rain, snow and weather on the line site, so that the recording unit can start recording due to the fact that the line voltage change exceeds the preset voltage threshold value, and the situation is only electric field fluctuation and is not that the line breaks down; because the electric field fluctuates and the power failure of the circuit does not occur, the fluctuation of electric field collection caused by the grounding fault or the influence of weather can not be identified only by the recording unit, so that the judgment is carried out by the aid of the collecting unit, and whether the waveform is effective or not is judged by comparing the change of the zero-flow effective value before and after the starting time of the recording; if the change of the zero current effective value reaches a preset zero current threshold value, the fault is generated at the moment, the fault is not caused by electric field fluctuation, so that the waveform is effective, and the recording wave synthesis file is uploaded; if the change of the zero-flow effective value does not reach the preset zero-flow threshold value, the fact that the zero-flow effective value is an invalid waveform generated due to electric field fluctuation and is not a fault waveform is indicated, and therefore the recording wave synthetic file needs to be filtered and cleared.
Further, when the recording unit sends the recording acquisition file to the aggregation unit, the information indicating whether the aggregation unit needs to perform further filtering, that is, the recording filtering identifier, may be included in the first frame data. The recording filtering identification is formed according to the recording starting reason of the recording unit, if the recording unit is a remote control starting recording unit, a zero-flow starting recording unit or a line current exceeds a preset current threshold value to start recording, the recording filtering identification sent in the first frame of the formed recording acquisition file is 0, and if the recording unit is started recording or the line voltage exceeds a preset voltage threshold value to start recording, the recording filtering identification sent in the first frame of the formed recording acquisition file is 1; as long as the recording filtering identifier sent by any one of the three recording units is 0, filtering is not required; if the recording filtering identifiers sent by the three recording units are all 1, the collecting unit needs to further judge.
In a possible implementation manner, the recording acquisition file may be data of four cycles before the recording start time and eight cycles after the recording start time.
Sampling point data of eighty cycles can be stored in each wave recording unit in real time, when the wave recording unit obtains the wave recording starting time in the wave recording starting frame, sampling point data of the first four cycles and the second eight cycles of the wave recording starting time can be extracted from the sampling point data of the eighty cycles stored in real time, the sampling point data are sent to a cache of a fault wave recording device, and then wave recording collection files are formed according to the data.
For example, the fault recording starting method provided by the present application may be implemented through the following process, and when the recording unit starts recording waves in a remote control manner or starts recording waves in a zero stream manner, reference may be specifically made to a second implementation flowchart of the fault recording starting method of the power distribution terminal shown in fig. 3.
Step 301, when any one of the recording units remotely controls to start recording or start recording in a zero stream mode, the recording unit broadcasts a recording start frame according to the recording start time of the recording unit;
step 302, the other two wave recording units receive the wave recording starting frame and judge whether the wave recording is started or not, and if the wave recording is not started, the wave recording is started; if the wave recording is started, selecting an earlier wave recording starting time from the wave recording starting time in the wave recording starting frame and the self wave recording starting time, and restarting the wave recording;
step 303, broadcasting a wave recording effective frame after the wave recording unit is started;
step 304, after each wave recording unit receives the wave recording effective frames of the other two wave recording units, acquiring a wave recording effective identifier from the wave recording effective frames;
305, when any one wave recording unit comprises the wave recording effective identifiers of the three wave recording units, forming a wave recording acquisition file;
and step 306, when the collecting unit receives the effective wave recording identifiers of the three wave recording units, acquiring wave recording acquisition files of the three wave recording units, acquiring a wave recording synthesis file according to the wave recording acquisition files, and uploading the wave recording synthesis file to the scheduling master station.
When the line voltage variation exceeds the preset voltage threshold and it is detected that the wave recording needs to be started, the specific process may refer to a third implementation flowchart of the fault wave recording starting method for the power distribution terminal shown in fig. 4.
Step 401, when any one of the recording units detects that the line voltage change exceeds a preset voltage threshold and detects that recording needs to be started, the recording unit judges whether current or voltage exists before the current or voltage change, if no current exists and no voltage exists, the circuit is just started, and recording does not need to be started;
step 402, if there is current or voltage, judging whether the voltage is a rising edge, if so, starting wave recording, and broadcasting a wave recording starting frame according to the self wave recording starting time;
step 403, if the line current and voltage are detected continuously, if two continuous cycle lines have no voltage and no current, determining that power failure occurs and not starting wave recording; if power failure is not detected by ten continuous cycles, starting wave recording, and broadcasting a wave recording starting frame according to the self wave recording starting time;
step 404, the other two wave recording units receive the wave recording starting frame and judge whether the wave recording is started or not, and if the wave recording is not started, the wave recording is started; if the wave recording is started, selecting an earlier wave recording starting moment from the wave recording starting moment in the wave recording starting frame and the wave recording starting moment of the wave recording starting frame, and restarting the wave recording;
step 405, broadcasting a wave recording effective frame after the wave recording unit is started;
step 406, after each wave recording unit receives the wave recording effective frames of the other two wave recording units, acquiring a wave recording effective identifier from the wave recording effective frames;
step 407, when any one of the wave recording units includes the wave recording effective identifiers of the three wave recording units, forming a wave recording acquisition file;
step 408, when the collecting unit receives the recording effective identifications of the three recording units, acquiring the recording acquisition files of the three recording units, acquiring a recording composite file according to the recording acquisition files, calculating the zero-flow effective value change according to the zero-flow effective values of the cycle before and after the recording starting time, determining the zero-flow effective value change as electric field fluctuation if the zero-flow effective value change does not reach a preset zero-flow threshold value, and removing the recording composite file if the recording composite file is invalid;
and step 409, if the zero stream effective value changes to reach a preset zero stream threshold value, the recording synthesis file is effective and uploaded to the scheduling master station.
When the line current change exceeds the preset current threshold value and it is detected that the recording needs to be started, the specific process may refer to a fourth implementation flowchart of the fault recording starting method of the power distribution terminal shown in fig. 5.
Step 501, when any wave recording unit detects that the current change of a line exceeds a preset current threshold and detects that wave recording needs to be started, the wave recording unit judges whether current or voltage exists before the current or voltage changes, if no current exists and no voltage exists, the line is just started, and wave recording does not need to be started;
step 502, if current or voltage exists, wave recording is started, and a wave recording starting frame is broadcasted according to the self wave recording starting time;
step 503, the other two recording units receive the recording start frame, and determine whether the recording unit itself starts recording, if not, then start recording; if the wave recording is started, selecting an earlier wave recording starting time from the wave recording starting time in the wave recording starting frame and the self wave recording starting time, and restarting the wave recording;
step 504, detecting whether current exists in the delay time after the wave recording unit is started, and if the current exists in the delay time all the time, determining that the current is load fluctuation and not broadcasting a wave recording effective frame;
step 505, if no current is detected in the delay time, broadcasting a recording effective frame;
step 506, after each wave recording unit receives the wave recording effective frames of the other two wave recording units, acquiring the wave recording effective identification from the wave recording effective frames;
step 507, when any one of the wave recording units comprises the effective wave recording identification of the three wave recording units, a wave recording acquisition file is formed;
and step 508, when the collecting unit receives the effective wave recording identifiers of the three wave recording units, acquiring wave recording acquisition files of the three wave recording units, acquiring a wave recording synthesis file according to the wave recording acquisition files, and uploading the wave recording synthesis file to the scheduling master station.
The embodiment of the invention provides a fault recording starting method of a power distribution terminal, which is used for controlling three recording units on a three-phase circuit to carry out synchronous recording, and when the recording units start recording, the recording starting frames are sent to the other two recording units to start the other two recording units, so that the three recording units can acquire recording data, and the three-phase recording data can be obtained; when any one of the wave recording units receives the wave recording starting frame, whether the wave recording unit starts the wave recording is judged, and the earlier wave recording starting time is determined by comparing the wave recording starting time, so that the time of the three wave recording units can be the earlier wave recording starting time, and the wave recording starting time of the three wave recording units is ensured to be consistent; by judging whether the line has voltage or current before the current or voltage change of the line exceeds the respective corresponding preset threshold, the condition that the recording unit mistakenly thinks that the line has a fault and starts recording because the line is just started is avoided; meanwhile, whether the line has power failure or not is determined by judging whether the line has voltage and current or not when the voltage change of the line falls, and the condition that the recording unit mistakenly considers the power failure as the line has a fault and starts recording is avoided; when the line current exceeds a preset current threshold, whether the current exists is judged within a delay time, the wave recording unit is prevented from being started due to load fluctuation, the fault condition can be accurately identified by the wave recording unit, and the condition that the wave recording is started under the non-fault condition, so that the uploading channel of the wave recording acquisition file is occupied, and the wave recording cannot be carried out or the wave recording acquisition file cannot be uploaded in time when the fault actually occurs is avoided; finally, the collecting unit judges whether the line voltage change exceeds a preset voltage threshold value or not through the zero-flow effective value, which is caused by load fluctuation, so that the recording composite files uploaded to the scheduling master station are all the conditions when the actual fault occurs or the conditions required by the scheduling master station; finally, a wave recording synthetic file which is accurate and effective at the same time can be formed, only the fault waveform and the waveform required by the dispatching master station are uploaded, and the flow loss caused by invalid data transmission is reduced, so that the data analysis burden of the master station is reduced, and the dispatching master station can accurately analyze the power fault.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A fault recording starting method of a power distribution terminal is characterized in that the method is used for controlling three recording units on a three-phase line to carry out synchronous recording;
the method comprises the following steps:
when any one wave recording unit starts recording, sending a wave recording starting frame to the other two wave recording units;
when any wave recording unit receives a wave recording starting frame, judging whether the wave recording unit starts the wave recording, if the wave recording unit does not start the wave recording, starting the wave recording according to the wave recording starting time in the received wave recording starting frame;
if the recording is started, selecting an earlier recording starting time from the recording starting time in the recording starting frame and the recording starting time of the recording, and restarting the recording;
the wave recording unit starts the wave recording mode and comprises self-starting wave recording;
the self-starting wave recording is carried out when the wave recording unit detects that the current or voltage change of the line exceeds the corresponding preset threshold value;
after the wave recording unit detects that the line current or voltage change exceeds the corresponding preset threshold value, the method further comprises the following steps:
judging whether the line has voltage and current before the line current or voltage changes;
if the circuit has no voltage and no current, the recording is not started;
further comprising:
when the wave recording unit detects that the line voltage change exceeds a preset voltage threshold, detecting whether the line voltage change is a rising edge, and starting wave recording if the line voltage change is the rising edge;
if the line voltage changes to a falling edge, continuing to detect the line current and voltage, and if two continuous cycle lines have no voltage and no current, determining that power failure occurs and not starting wave recording; and if the power failure is not detected in ten continuous cycles, starting wave recording.
2. The fault wave recording starting method of the power distribution terminal according to claim 1, wherein the wave recording unit starts the wave recording in a manner further comprising remotely controlling the start wave recording, the started wave recording, and the zero-flow start wave recording;
the remote control starting wave recording is that the wave recording unit starts wave recording according to a remote control wave recording command input from the outside;
the started wave recording unit starts wave recording according to the received wave recording start frame sent by other wave recording units;
the zero current starting wave recording is the wave recording started by the wave recording unit when the zero current effective value changes and exceeds a preset zero current threshold value, and the zero current effective value is obtained by calculating current vector data of a three-phase line.
3. The fault recording starting method of the power distribution terminal according to claim 2, wherein the three recording units are in wireless communication with the collecting unit;
the zero-stream start recording process comprises the following steps:
the collecting unit calculates a real-time zero-flow effective value according to three-phase circuit current vector data received in real time and sent by the three wave recording units; when the zero stream effective value changes and exceeds a preset zero stream threshold value, sending a wave recording starting frame to the three wave recording units; the wave recording starting time in the wave recording starting frame is the time of zero stream effective value change;
and each wave recording unit starts wave recording according to the wave recording starting time in the received wave recording starting frame.
4. The method for starting the fault recording of the power distribution terminal according to claim 3, wherein the collecting unit is further in wireless communication with the dispatching master station;
the process of remote control starting wave recording comprises the following steps:
when the collection unit receives a remote control wave recording command of the scheduling master station, sending a remote control wave recording starting frame to a remotely controlled wave recording unit according to the remote control wave recording command;
and the remote controlled wave recording unit starts wave recording according to the received remote controlled wave recording start frame.
5. The fault recording starting method of the power distribution terminal according to claim 4, further comprising:
when the starting mode of the wave recording unit is remote control starting wave recording, zero-stream starting wave recording, started wave recording or the wave recording unit detects that the line voltage change exceeds a preset voltage threshold value to start wave recording, the wave recording unit also sends a wave recording effective frame to the other two wave recording units and the collecting unit;
when the wave recording unit detects that the change of the line current exceeds a preset current threshold value to start recording, whether the current exists in the delay time is also detected; if no current is detected in the delay time, sending a recording effective frame to the other two recording units and the collecting unit; if the current is detected to exist all the time in the delay time, the load fluctuation is determined, and the recording effective frame is not sent to the other two recording units and the collecting unit.
6. The fault recording starting method for the power distribution terminal according to claim 5, further comprising:
when any one of the wave recording units receives a wave recording effective frame, acquiring a wave recording effective identifier from the wave recording effective frame; when any one of the wave recording units comprises the effective wave recording identification of the three wave recording units, a wave recording acquisition file is formed;
when the collecting unit receives the effective wave recording identification of the three wave recording units, the wave recording acquisition files of the three wave recording units are obtained, the wave recording synthesis file is obtained according to the wave recording acquisition files, and the wave recording synthesis file is uploaded to the dispatching master station.
7. The fault recording starting method of the power distribution terminal according to claim 6, wherein after the recording synthesis file is obtained, the collecting unit further judges whether the recording synthesis file is valid according to the recording collection file;
the collection unit judges whether the recording wave synthesis file is effective according to the recording wave acquisition file, and the method comprises the following steps:
if any one of the recording acquisition files has remote control starting recording, zero current starting recording or line current change exceeds a preset current threshold value to start recording, the recording synthesis file is effective and is uploaded to the scheduling master station;
if the three recording acquisition files are all one of the starting recording or the started recording when the line voltage change exceeds a preset voltage threshold, calculating the zero flow effective value change according to the zero flow effective values of the cycle before and after the recording starting time, if the zero flow effective value change reaches the preset zero flow threshold, enabling the recording synthesis file to be effective, and uploading the recording synthesis file to a scheduling master station; and if the change of the zero stream effective value does not reach a preset zero stream threshold value, the wave recording synthetic file is invalid, and the wave recording synthetic file is cleared.
8. The fault recording starting method of the power distribution terminal according to claim 6, wherein the recording collection file is data of four cycles before the recording starting time and eight cycles after the recording starting time.
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