CN111751663A - Method and system for drawing fault overall process time sequence based on power grid fault recording graph - Google Patents
Method and system for drawing fault overall process time sequence based on power grid fault recording graph Download PDFInfo
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0007—Frequency selective voltage or current level measuring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/042—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for current transformers
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Abstract
The invention provides a method for drawing a fault overall process time sequence based on a power grid fault oscillogram, which comprises the steps of obtaining a line fault oscillogram, wherein a relay protection switching value waveform and a power transmission line three-phase current waveform which take the same time scale as a metering unit are formed on the line fault oscillogram; reading the measured numbers of the moment that the waveform in the three-phase current waveform of the power transmission line begins to suddenly change, disappears after the waveform finishes suddenly changing, and returns to normal after the waveform disappears, wherein the measured numbers are respectively mapped on a time scale; and sequentially setting the three instant moments in the three-phase current waveform of the power transmission line as the initial, middle and tail moments of the fault overall process time sequence, converting and drawing the total time and each segment time of the fault overall process time sequence according to the measured numbers of the three instants, wherein the total time and each segment time carry respective information. By implementing the method, the relative time of each event is directly read from the electrical quantity mutation of the line fault oscillogram so as to draw the time sequence of the whole fault process, so that the method is quick, accurate, simple and visual, and time-saving and labor-saving.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a method and a system for drawing a fault overall process time sequence based on a power grid fault recording chart.
Background
When analyzing the grid fault, it is especially important to know the development process time sequence of the grid fault. And the fault point is quickly searched through the time sequence of the power grid fault development process, so that the support basis for quickly recovering the power supply capacity of the power grid is accelerated.
At present, the relay protection device of the existing manufacturer often obtains inaccurate occurrence time of each event according to the deflection time of the sudden change. For example, the tripping or closing time of the circuit breaker generally depends on the action time of the auxiliary contact of the circuit breaker, but the auxiliary contact of the circuit breaker is not precisely synchronized with the main contact, and a certain time difference exists, so that inaccuracy is caused.
Therefore, in order to overcome the defects and shortcomings of the prior art, the inventor provides a method for drawing the time sequence of the whole fault process based on a power grid fault recording chart, the relative time of each event is directly read from the electrical quantity mutation of the line fault recording chart to be used for drawing the time sequence of the whole fault process, and the method is rapid, accurate, simple, intuitive, time-saving and labor-saving.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method for drawing a fault overall process time sequence based on a power grid fault oscillogram, which directly reads the relative time of each event from the electrical quantity mutation of the line fault oscillogram for drawing the fault overall process time sequence, and is not only fast, accurate, simple and intuitive, but also time-saving and labor-saving.
In order to solve the technical problem, an embodiment of the present invention provides a method for drawing a fault overall process time sequence based on a power grid fault oscillogram, where the method includes the following steps:
step S1, obtaining a line fault recording chart, wherein a relay protection switching value waveform and a transmission line three-phase current waveform which take the same time scale as a metering unit are formed on the line fault recording chart; the relay protection switching value waveform comprises a starting switching value waveform, a tripping switching value waveform and a closing switching value waveform;
step S2, reading the measured numbers of the moment when the waveform in the three-phase current waveform of the power transmission line begins to suddenly change, the moment when the waveform disappears after finishing sudden change and the moment when the waveform returns to normal after disappearing, which are respectively mapped on the time scale;
step S3, setting the instant time when the waveform in the three-phase current waveform of the power transmission line begins to mutate, the instant time when the waveform disappears after finishing the mutation and the instant time when the waveform returns to normal after disappearing as the initial time, the middle time and the end time of the fault overall process time sequence in sequence, further converting and drawing the total time of the fault overall process time sequence, the first section time formed by the initial time and the middle time and the second section time formed by the middle time and the end time based on the time scale according to the various metering numbers read in the three-phase current waveform of the power transmission line, and carrying corresponding information on the total time and each section time of the fault overall process time sequence respectively; wherein, the information carried in the total time is the time of the whole process of the line fault; the information carried in the first segment time is the duration time of the line fault; and the information carried in the second section of time is the duration time from the line fault removal to the normal recovery.
Wherein the method further comprises:
reading the measured numbers which are mapped on the time scale corresponding to the moment when the respective waveforms in the starting switching value waveform and the tripping switching value waveform start to suddenly change, further converting and drawing a first subsection time formed by the moment when the waveforms in the starting switching value waveform start to suddenly change and the moment when the waveforms in the tripping switching value waveform start to suddenly change on the basis of the time scale on the first subsection time according to the measured numbers read at the moment when the respective waveforms in the starting switching value waveform and the tripping switching value waveform start to suddenly change, and carrying information on the first subsection time to obtain the relay protection action process time.
And the metering numbers mapped on the time scale respectively corresponding to the moment when the waveform in the starting switching value waveform begins to suddenly change and the moment when the waveform in the three-phase current waveform of the power transmission line begins to suddenly change are the same metering number.
Wherein the method further comprises:
according to the metering number read at the moment that the waveform in the trip switching value waveform begins to suddenly change and the metering number read at the moment that the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing, on the basis of the time scale, on the first subsection time, a second subsection time formed by the moment that the waveform in the trip switching value waveform begins to suddenly change and the moment that the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing is calculated and drawn, and information carried on the second subsection time is the tripping action lag time of the circuit breaker.
Wherein the method further comprises:
reading the metering number which is mapped on the time scale correspondingly to the moment when the waveform in the waveform of the switching-on switching value begins to suddenly change, and combining the metering number read at the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing, converting and drawing a third subsection time which is formed by the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing and the moment when the waveform in the waveform of the switching-on switching value begins to suddenly changing on the basis of the time scale on the second subsection time, and carrying information on the third subsection time to be the process time from tripping to reclosing action of the circuit breaker.
Wherein the method further comprises:
and on the second subsection time, based on the time scale, converting and drawing a fourth subsection time formed by the moment when the waveform in the waveform of the switching-on switching value begins to suddenly change and the moment when the waveform in the waveform of the three-phase current of the power transmission line returns to normal after disappearing, wherein the fourth subsection time carries information which is the switching-on action lag time of the circuit breaker.
Wherein the method further comprises:
reading the measured number which is mapped on the time scale correspondingly to the moment of disappearance after the sudden change of the waveform in the waveform of the closing switch value, and combining the measured number read at the moment of disappearance after the sudden change of the waveform in the waveform of the three-phase current of the power transmission line, converting and drawing a fifth sub-segment time which is formed by the moment of disappearance after the sudden change of the waveform in the waveform of the three-phase current of the power transmission line and the moment of disappearance after the sudden change of the waveform in the waveform of the closing switch value on the basis of the time scale, and carrying information on the fifth sub-segment time as the process time for returning the protective action of the relay.
The embodiment of the invention also provides a system for drawing the fault overall process time sequence based on the power grid fault oscillogram, which comprises the following steps:
the circuit fault recording diagram acquisition unit is used for acquiring a circuit fault recording diagram, and a relay protection switching value waveform and a transmission line three-phase current waveform which take the same time scale as a metering unit are formed on the circuit fault recording diagram; the relay protection switching value waveform comprises a starting switching value waveform, a tripping switching value waveform and a closing switching value waveform;
the line current waveform key moment metering reading unit is used for reading the metering numbers which are mapped on the time scale correspondingly respectively at the moment when the waveform begins to change suddenly, the moment when the waveform disappears after finishing changing suddenly and the moment when the waveform returns to normal after disappearing in the three-phase current waveform of the power transmission line;
the fault overall process time sequence drawing unit is used for sequentially setting the instant time when the waveform in the three-phase current waveform of the power transmission line begins to mutate, the instant time when the waveform disappears after finishing the mutation and the instant time when the waveform returns to normal after disappearing as the initial time, the middle time and the final time of the fault overall process time sequence, further converting and drawing the total time of the fault overall process time sequence, the first section time formed by the initial time and the middle time and the second section time formed by the middle time and the final time based on the time scale according to the various metering numbers read in the three-phase current waveform of the power transmission line, and respectively carrying corresponding information on the total time and each section time of the fault overall process time sequence; wherein, the information carried in the total time is the time of the whole process of the line fault; the information carried in the first segment time is the duration time of the line fault; and the information carried in the second section of time is the duration time from the line fault removal to the normal recovery.
Wherein, still include:
and a first segment time sequence drawing unit, configured to read a measurement number mapped on the time scale corresponding to the instant at which the respective waveforms of the start switching value waveform and the trip switching value waveform start to change suddenly, further convert and draw a first sub-segment time formed by the instant at which the waveforms of the start switching value waveform start to change suddenly and the instant at which the waveforms of the trip switching value waveform start to change suddenly based on the time scale over the first segment time, according to the measurement number read at the instant at which the respective waveforms of the start switching value waveform and the trip switching value waveform start to change suddenly, and carry information on the first sub-segment time as a relay protection operation process time.
Wherein, still include:
and the second subsection time sequence drawing unit is used for reading the measured number which is correspondingly mapped on the time scale at the moment when the waveform in the waveform of the switching-on switching value begins to suddenly change in the waveform of the switching-on switching value, and combining the measured number read at the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing, converting and drawing a third subsection time which is formed by the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing and the moment when the waveform in the waveform of the switching-on switching value begins to suddenly changing in the second subsection time, and carrying information on the third subsection time as the process time from the tripping action to the reclosing action of the circuit breaker.
The embodiment of the invention has the following beneficial effects:
the invention directly reads the relative time of each event from the starting switching value waveform, the tripping switching value waveform, the closing switching value waveform and the electric quantity mutation of the three-phase current waveform of the power transmission line in the line fault recording chart to draw the time sequence of the whole fault process, and the invention is not only quick, accurate, simple and visual, but also saves time and labor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for drawing a fault overall process time sequence based on a power grid fault oscillogram according to an embodiment of the present invention;
fig. 2 is a line fault oscillogram when a line fault occurs in an application scene of the method for drawing a fault overall process time sequence based on a power grid fault oscillogram according to the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a fault overall process timing sequence based on the line fault oscillogram of FIG. 2;
fig. 4 is a schematic structural diagram for drawing a fault overall process time sequence based on a power grid fault oscillogram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a method for drawing a fault overall process time sequence based on a power grid fault oscillogram in an embodiment of the present invention includes the following steps:
step S1, obtaining a line fault recording chart, wherein a relay protection switching value waveform and a transmission line three-phase current waveform which take the same time scale as a metering unit are formed on the line fault recording chart; the relay protection switching value waveform comprises a starting switching value waveform, a tripping switching value waveform and a closing switching value waveform;
specifically, a line fault recording diagram is collected through a wave recorder and is guided into computer equipment, so that the computer equipment can call each line fault recording diagram at any time; the line fault recording graph comprises but is not limited to a relay protection switching value waveform, a transmission line three-phase current waveform, a bus three-phase voltage waveform and the like, and a zero sequence protection current waveform, a zero sequence protection voltage waveform, a transmission line voltage waveform and the like are also formed; the relay protection switching value waveform comprises a starting switching value waveform, a tripping switching value waveform, a closing switching value waveform, a transmitting switching value waveform, a receiving switching value waveform and the like.
Meanwhile, the line fault oscillogram is measured by the same time scale (such as 20 ms/grid) so as to rapidly read the periodic variation of all waveforms in the chart.
Step S2, reading the measured numbers of the moment when the waveform in the three-phase current waveform of the power transmission line begins to change suddenly, the moment when the waveform disappears after finishing changing suddenly and the moment when the waveform returns to normal after disappearing, which are respectively mapped on a time scale;
specifically, the instant moment when the waveform in the three-phase current waveform of the power transmission line begins to suddenly change is marked as the moment when the line fault occurs, the instant moment when the waveform in the three-phase current waveform of the power transmission line disappears after finishing sudden change is marked as the moment when the line fault is removed, and the instant moment when the waveform in the three-phase current waveform of the power transmission line recovers to be normal is marked as the moment when the line fault is recovered to be normal, so that the moment when the line fault occurs at the beginning, the moment when the line fault is removed and the moment when the line is recovered to be normal are.
Therefore, in fig. 2, it is necessary to read the measurement numbers mapped on the time scale corresponding to each of the line fault occurrence start time, the line fault removal time, and the line normal restoration time. If the metering number of the initial time of the line fault is 0 ms; the metering number of the line fault clearing time is 60 ms; the number of counts at the time of line normal recovery is 01140 ms.
Step S3, setting the instant time when the waveform in the three-phase current waveform of the power transmission line begins to mutate, the instant time when the waveform disappears after finishing the mutation and the instant time when the waveform returns to normal after disappearing as the initial time, the middle time and the end time of the fault overall process time sequence in sequence, further converting and drawing the total time of the fault overall process time sequence, the first section time formed by the initial time and the middle time and the second section time formed by the middle time and the end time based on the time scale according to each measured number read in the three-phase current waveform of the power transmission line, and carrying corresponding information on the total time and each section time of the fault overall process time sequence respectively; wherein, the information carried in the total time is the time of the whole process of the line fault; the information carried in the first segment time is the duration time of the line fault; the information carried in the second segment of time is the duration time from the time when the line fault is removed to the time when the line fault is recovered to normal;
specifically, the line fault occurrence start time, the line fault removal time, and the line normal restoration time in step S2 are respectively the start time, the intermediate time, and the end time of the fault overall process timing sequence, and the fault overall process timing sequence is plotted and corresponding information is marked according to the respective corresponding measurement numbers of the line fault occurrence start time, the line fault removal time, and the line normal restoration time.
As shown in fig. 3, the total time of the fault overall process timing sequence is formed by the head end time, the middle time and the tail end time, and the marked information on the total time is the line fault overall process time L, i.e. the total time period of the line fault overall process formed by the line fault occurrence start time, the line fault removal time and the line normal recovery time (L shown in fig. 2, 1140ms is summed to obtain 1140 ms);
a first segment time a formed by a head-end time and a middle time, and the information marked on the first segment time a is the duration time of the line fault, that is, the duration time period of the line fault formed by the initial time of the line fault and the line fault clearing time (as shown in a of fig. 2, total 60ms, the first segment time a is 60 ms);
meanwhile, a second segment time G is formed by the middle time and the end time, and the marked information on the second segment time G is a duration time from the line fault removal to the time before the normal recovery, that is, a duration time period from the line fault removal to the time before the normal recovery, where the duration time period is formed by the line fault removal time and the line normal recovery time (as shown in fig. 2, G is 1140ms-60ms in total, 1080ms, and the second segment time G is 1080 ms).
Step S4, reading the measured numbers mapped on the time scale corresponding to the instant when the respective waveforms of the starting switching value waveform and the tripping switching value waveform start to change suddenly, further according to the measured numbers read at the instant when the respective waveforms of the starting switching value waveform and the tripping switching value waveform start to change suddenly, converting and drawing a first sub-segment time formed by the instant when the waveforms of the starting switching value waveform start to change suddenly and the instant when the waveforms of the tripping switching value waveform start to change suddenly on the first segment time based on the time scale, and carrying information on the first sub-segment time as the relay protection action process time;
specifically, in order to further grasp the entire fault development process, it is necessary to subdivide the first divisional time a in fig. 2 and 3. At this time, the measured numbers mapped on the time scale corresponding to the moment when the waveform in the starting switching value waveform begins to suddenly change and the moment when the waveform in the three-phase current waveform of the power transmission line begins to suddenly change are the same, namely, the two measured numbers have the same initial moment.
Then, in fig. 2, the instant when the waveform in the trip switching value waveform begins to suddenly change is marked as the trip time of the relay protection action, and the corresponding measured number mapped on the time scale at the trip time of the relay protection action is read. For example, the number of times of tripping of the relay protection operation is 15 ms.
Finally, in fig. 3, a time period from the instant when the waveform in the starting switching value waveform starts to suddenly change to the instant when the waveform in the tripping switching value waveform starts to suddenly change may be taken as a first sub-segment time B, and the information is marked as a relay protection action process time, that is, a relay protection action process time period formed by the line fault occurrence starting time and the relay protection action tripping time, corresponding to a time from the fault start to the protection exit (as shown in B in fig. 2, the total time is 15ms, and the first sub-segment time B is obtained as 15 ms).
Step S5, according to the metering number read at the moment that the waveform in the trip switching value waveform begins to suddenly change and the metering number read at the moment that the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing, on the basis of the time scale, on the first subsection time, a second subsection time formed by the moment that the waveform in the trip switching value waveform begins to suddenly change and the moment that the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing is converted and drawn, and information carried on the second subsection time is the circuit breaker trip action lag time;
specifically, the first segment time a in fig. 2 and 3 has been subdivided into a first sub-segment time B, and then the remaining time period is taken as a second sub-segment time C, where the second sub-segment time C is a circuit breaker trip action lag time period formed by an instant when the waveform in the trip switching value waveform starts to suddenly change and an instant when the waveform in the transmission line three-phase current waveform disappears after finishing suddenly changing, and corresponds to a time from the action of the trip relay to the disappearance of the fault current.
Then, in fig. 2, the measured number on the time scale is obtained according to the reading of the moment (namely the tripping moment of the relay protection action) of the sudden change of the waveform in the waveform of the trip switching value and the reading of the moment (namely the line fault cutting moment) of the disappearance of the waveform after the sudden change of the end in the waveform of the three-phase current of the power transmission line; if the metering number of the tripping time of the relay protection action is 15ms, and the metering number of the line fault clearing time is 60 ms; in fig. 3, the second sub-segment time C is directly marked (as shown in fig. 2 as C, the total of 60ms to 15ms is 45ms, and the second sub-segment time C is obtained as 45ms), and the marking information is the relay protection operation process time.
Step S6, reading the measured number which is mapped on the time scale correspondingly to the moment when the waveform in the waveform of the switching-on switching value begins to mutate, and combining the measured number read by the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing the mutation, converting and drawing a third subsection time which is formed by the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing the mutation and the moment when the waveform in the waveform of the switching-on switching value begins to mutate on the basis of the time scale, wherein the third subsection time carries information and is the process time from tripping to reclosing action of the circuit breaker;
specifically, in order to further grasp the entire fault development process, it is necessary to subdivide the second divisional time G in fig. 2 and 3. In this case, in fig. 2, the moment when the waveform of the closing switching value waveform begins to suddenly change is marked as the circuit breaker reclosing command receiving moment, and the number of meters at the circuit breaker reclosing command receiving moment is read. For example, the number of measurements at the trip time of the relay protection operation is 00922ms.
Then, a time period formed by a moment that the waveform in the three-phase current waveform of the power transmission line disappears after finishing sudden change and a moment that the waveform in the three-phase current waveform of the power transmission line disappears after finishing sudden change is taken as a third sub-segment time E, and the marking information is a process time from tripping to reclosing action of the circuit breaker, namely a process time period from tripping to reclosing action of the circuit breaker formed by a line fault removing time and a circuit breaker reclosing command receiving time, and is correspondingly a process time from starting timing of failure disappearance to sending of a reclosing command (E shown in fig. 2, the total time is 922ms-60ms is 826ms, and the third sub-segment time E is 826 ms).
Step S7, on the basis of the time scale, converting and drawing a fourth sub-segment time formed by the moment when the waveform in the waveform of the switching-on switching value begins to suddenly change and the moment when the waveform in the waveform of the three-phase current of the power transmission line returns to normal after disappearing, wherein the fourth sub-segment time carries information as the switching-on action lag time of the circuit breaker;
specifically, the second segment time G in fig. 2 and 3 has subdivided into a third sub-segment time E, and then the remaining time period is taken as a fourth sub-segment time F, where the fourth sub-segment time F is a time period after the circuit breaker switching-on action is delayed, which is formed by the moment when the waveform in the switching-on switching value waveform begins to suddenly change and the moment when the waveform in the three-phase current waveform of the power transmission line returns to normal after disappearing, and corresponds to the process time from the reclosing relay action to the circuit breaker switching-on success, and the load current appears.
Then, in fig. 2, according to the measured number on the time scale at the moment when the waveform in the waveform of the switching-on/off value begins to suddenly change and the measured number on the time scale at the moment when the waveform in the waveform of the three-phase current of the power transmission line recovers to normal after disappearing; in fig. 3, the fourth sub-segment time F is directly marked, that is, the circuit breaker closing operation lag time period formed by the circuit breaker reclosing command receiving time and the line normal recovery time (as shown in fig. 2, F is 01140ms-00922ms is 218ms in total, and the fourth sub-segment time F is 218ms), and the marking information is the circuit breaker closing operation lag time.
Step S8, reading a measurement number mapped on the time scale corresponding to the moment of disappearance after the waveform of the closing switching value waveform ends mutation, and combining the measurement number read at the moment of disappearance after the waveform of the transmission line three-phase current waveform ends mutation, converting and drawing, on the third sub-segment time, a fifth sub-segment time formed by the moment of disappearance after the waveform of the transmission line three-phase current waveform ends mutation and the moment of disappearance after the waveform of the closing switching value waveform ends mutation, on the basis of the time scale, and carrying information on the fifth sub-segment time as process time for returning the relay protection action.
Specifically, in order to further grasp the whole fault development process, it is necessary to subdivide the third sub-segment time E in fig. 2 and 3. In this case, in fig. 2, the moment when the waveform disappears after the end of the abrupt change in the closing switching value waveform is marked as the relay protection operation return time, and the count of the relay protection operation return time is read. For example, the number of counts at the return timing of the relay protection operation is 90 ms.
Then, a time period formed by a moment that a waveform in a three-phase current waveform of the power transmission line disappears after sudden change and a moment that a waveform in a closing switching value waveform disappears after sudden change is taken as a fifth sub-segment time D, and the marking information is a process time for returning the relay protection action, namely a process time period for returning the relay protection action formed by a line fault clearing time and a relay protection action returning time, and corresponds to a time from the fault current disappearance time to the tripping relay returning time (as shown in D in fig. 2, the total time is 90ms-60ms which is 30ms, and the fifth sub-segment time D is 30 ms).
It should be noted that, in fig. 2, it is determined whether the current waveform of each phase of the power transmission line has a sudden change according to the amplitude change of the current waveform of each phase of the power transmission line in the three-phase current waveform of the power transmission line, and if the amplitude of the current waveform of a certain phase of the power transmission line is suddenly increased within a certain period of time, that is, the position of the peak or the trough on the current curve exceeds the peak or the trough of the original curve, it is determined that the current waveform of the phase of the power transmission line has a sudden. And meanwhile, judging whether a sudden change waveform exists according to whether step waveforms exist in the starting switching value waveform, the tripping switching value waveform and the closing switching value waveform in the relay protection switching value waveform, and if the step waveforms exist in the closing switching value waveform, determining that the sudden change exists in the closing switching value waveform. Meanwhile, in fig. 2, the distances between the time scales 01140ms, 01074ms and 00922ms are short because the line fault recording diagram is too long and is folded.
In summary, in fig. 3, it can be quickly understood that the total time L of the entire fault process is 1140ms, the duration time a of the line fault is 60ms, and the duration time G after the line fault is removed and before the line fault is recovered to normal is 1080 ms; the relay protection action process time B is 15ms, the relay protection action process time C is 45ms, the relay protection action return process time D is 30ms, the process time E from tripping to reclosing of the breaker is 862ms, the breaker closing action lag time F is 218ms and the like.
As shown in fig. 4, in an embodiment of the present invention, a system for drawing a fault overall process time sequence based on a power grid fault oscillogram includes:
the line fault oscillogram acquiring unit 110 is configured to acquire a line fault oscillogram, where a relay protection switching value waveform and a transmission line three-phase current waveform that take a same time scale as a measurement unit are formed on the line fault oscillogram; the relay protection switching value waveform comprises a starting switching value waveform, a tripping switching value waveform and a closing switching value waveform;
the line current waveform key time measurement reading unit 120 is configured to read a measurement number, which is mapped on the time scale, corresponding to each of a moment at which a waveform starts to suddenly change, a moment at which the waveform disappears after finishing sudden change, and a moment at which the waveform returns to normal after disappearing in the three-phase current waveform of the power transmission line;
a fault overall process time sequence drawing unit 130, configured to sequentially set an instant time at which a waveform in the three-phase current waveform of the power transmission line starts to suddenly change, an instant time at which the waveform disappears after finishing sudden change, and an instant time at which the waveform returns to normal after disappearing as a start time, an intermediate time, and a tail time of the fault overall process time sequence, further convert and draw a total time of the fault overall process time sequence, a first segment time formed by the start time and the intermediate time, and a second segment time formed by the intermediate time and the tail time based on the time scale according to each measured number read from the three-phase current waveform of the power transmission line, where the total time and each segment time of the fault overall process time sequence carry corresponding information respectively; wherein, the information carried in the total time is the time of the whole process of the line fault; the information carried in the first segment time is the duration time of the line fault; and the information carried in the second section of time is the duration time from the line fault removal to the normal recovery.
Wherein, still include:
a first segment timing drawing unit 140, configured to read a measurement number mapped on the time scale corresponding to the instant at which the respective waveforms of the start switching value waveform and the trip switching value waveform start to change abruptly, further convert and draw, on the basis of the time scale, a first sub-segment time formed by the instant at which the respective waveforms of the start switching value waveform start to change abruptly and the instant at which the respective waveforms of the trip switching value waveform start to change abruptly in the first segment time, and carry information on the first sub-segment time as a relay protection operation process time, according to the measurement number read at the instant at which the respective waveforms of the start switching value waveform and the trip switching value waveform start to change abruptly.
Wherein, still include:
and a second segmentation timing drawing unit 150, configured to read a measurement number mapped on the time scale correspondingly to an instant at which a waveform in the switching-on switching value waveform begins to suddenly change, and combine the measurement number read at the instant at which the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing, convert and draw, in the second segmentation time, a third sub-segmentation time formed by the instant at which the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing and the instant at which the waveform in the switching-on switching value waveform begins to suddenly changing, and carry information on the third sub-segmentation time as a process time from tripping to reclosing of the circuit breaker.
The embodiment of the invention has the following beneficial effects:
the invention directly reads the relative time of each event from the starting switching value waveform, the tripping switching value waveform, the closing switching value waveform and the electric quantity mutation of the three-phase current waveform of the power transmission line in the line fault recording chart to draw the time sequence of the whole fault process, and the invention is not only quick, accurate, simple and visual, but also saves time and labor.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A method for drawing a fault overall process time sequence based on a power grid fault oscillogram is characterized by comprising the following steps:
step S1, obtaining a line fault recording chart, wherein a relay protection switching value waveform and a transmission line three-phase current waveform which take the same time scale as a metering unit are formed on the line fault recording chart; the relay protection switching value waveform comprises a starting switching value waveform, a tripping switching value waveform and a closing switching value waveform;
step S2, reading the measured numbers of the moment when the waveform in the three-phase current waveform of the power transmission line begins to suddenly change, the moment when the waveform disappears after finishing sudden change and the moment when the waveform returns to normal after disappearing, which are respectively mapped on the time scale;
step S3, setting the instant time when the waveform in the three-phase current waveform of the power transmission line begins to mutate, the instant time when the waveform disappears after finishing the mutation and the instant time when the waveform returns to normal after disappearing as the initial time, the middle time and the end time of the fault overall process time sequence in sequence, further converting and drawing the total time of the fault overall process time sequence, the first section time formed by the initial time and the middle time and the second section time formed by the middle time and the end time based on the time scale according to the various metering numbers read in the three-phase current waveform of the power transmission line, and carrying corresponding information on the total time and each section time of the fault overall process time sequence respectively; wherein, the information carried in the total time is the time of the whole process of the line fault; the information carried in the first segment time is the duration time of the line fault; and the information carried in the second section of time is the duration time from the line fault removal to the normal recovery.
2. The method for mapping fault overall process timing based on grid fault oscillograms of claim 1, wherein the method further comprises:
reading the measured numbers which are mapped on the time scale corresponding to the moment when the respective waveforms in the starting switching value waveform and the tripping switching value waveform start to suddenly change, further converting and drawing a first subsection time formed by the moment when the waveforms in the starting switching value waveform start to suddenly change and the moment when the waveforms in the tripping switching value waveform start to suddenly change on the basis of the time scale on the first subsection time according to the measured numbers read at the moment when the respective waveforms in the starting switching value waveform and the tripping switching value waveform start to suddenly change, and carrying information on the first subsection time to obtain the relay protection action process time.
3. The method for drawing the fault overall-process time sequence based on the power grid fault recording diagram as claimed in claim 2, wherein the moment when the waveform in the starting switching value waveform begins to suddenly change and the moment when the waveform in the three-phase current waveform of the power transmission line begins to suddenly change are respectively mapped on the same metering number on the time scale.
4. The method for mapping fault overall process timing based on grid fault oscillograms of claim 2, wherein the method further comprises:
according to the metering number read at the moment that the waveform in the trip switching value waveform begins to suddenly change and the metering number read at the moment that the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing, on the basis of the time scale, on the first subsection time, a second subsection time formed by the moment that the waveform in the trip switching value waveform begins to suddenly change and the moment that the waveform in the power transmission line three-phase current waveform disappears after finishing suddenly changing is calculated and drawn, and information carried on the second subsection time is the tripping action lag time of the circuit breaker.
5. The method for mapping fault overall process timing based on grid fault oscillograms of claim 1, wherein the method further comprises:
reading the metering number which is mapped on the time scale correspondingly to the moment when the waveform in the waveform of the switching-on switching value begins to suddenly change, and combining the metering number read at the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing, converting and drawing a third subsection time which is formed by the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing and the moment when the waveform in the waveform of the switching-on switching value begins to suddenly changing on the basis of the time scale on the second subsection time, and carrying information on the third subsection time to be the process time from tripping to reclosing action of the circuit breaker.
6. The method for mapping fault overall process timing based on grid fault oscillograms of claim 5, wherein the method further comprises:
and on the second subsection time, based on the time scale, converting and drawing a fourth subsection time formed by the moment when the waveform in the waveform of the switching-on switching value begins to suddenly change and the moment when the waveform in the waveform of the three-phase current of the power transmission line returns to normal after disappearing, wherein the fourth subsection time carries information which is the switching-on action lag time of the circuit breaker.
7. The method for mapping fault overall process timing based on grid fault oscillograms of claim 5, wherein the method further comprises:
reading the measured number which is mapped on the time scale correspondingly to the moment of disappearance after the sudden change of the waveform in the waveform of the closing switch value, and combining the measured number read at the moment of disappearance after the sudden change of the waveform in the waveform of the three-phase current of the power transmission line, converting and drawing a fifth sub-segment time which is formed by the moment of disappearance after the sudden change of the waveform in the waveform of the three-phase current of the power transmission line and the moment of disappearance after the sudden change of the waveform in the waveform of the closing switch value on the basis of the time scale, and carrying information on the fifth sub-segment time as the process time for returning the protective action of the relay.
8. The utility model provides a system for draw trouble overall process chronogenesis based on electric wire netting trouble oscillogram which characterized in that includes:
the circuit fault recording diagram acquisition unit is used for acquiring a circuit fault recording diagram, and a relay protection switching value waveform and a transmission line three-phase current waveform which take the same time scale as a metering unit are formed on the circuit fault recording diagram; the relay protection switching value waveform comprises a starting switching value waveform, a tripping switching value waveform and a closing switching value waveform;
the line current waveform key moment metering reading unit is used for reading the metering numbers which are mapped on the time scale correspondingly respectively at the moment when the waveform begins to change suddenly, the moment when the waveform disappears after finishing changing suddenly and the moment when the waveform returns to normal after disappearing in the three-phase current waveform of the power transmission line;
the fault overall process time sequence drawing unit is used for sequentially setting the instant time when the waveform in the three-phase current waveform of the power transmission line begins to mutate, the instant time when the waveform disappears after finishing the mutation and the instant time when the waveform returns to normal after disappearing as the initial time, the middle time and the final time of the fault overall process time sequence, further converting and drawing the total time of the fault overall process time sequence, the first section time formed by the initial time and the middle time and the second section time formed by the middle time and the final time based on the time scale according to the various metering numbers read in the three-phase current waveform of the power transmission line, and respectively carrying corresponding information on the total time and each section time of the fault overall process time sequence; wherein, the information carried in the total time is the time of the whole process of the line fault; the information carried in the first segment time is the duration time of the line fault; and the information carried in the second section of time is the duration time from the line fault removal to the normal recovery.
9. The system for mapping the fault overall process timing sequence based on the grid fault oscillogram of claim 8, further comprising:
and a first segment time sequence drawing unit, configured to read a measurement number mapped on the time scale corresponding to the instant at which the respective waveforms of the start switching value waveform and the trip switching value waveform start to change suddenly, further convert and draw a first sub-segment time formed by the instant at which the waveforms of the start switching value waveform start to change suddenly and the instant at which the waveforms of the trip switching value waveform start to change suddenly based on the time scale over the first segment time, according to the measurement number read at the instant at which the respective waveforms of the start switching value waveform and the trip switching value waveform start to change suddenly, and carry information on the first sub-segment time as a relay protection operation process time.
10. The system for mapping the fault overall process timing sequence based on the grid fault oscillogram of claim 8, further comprising:
and the second subsection time sequence drawing unit is used for reading the measured number which is correspondingly mapped on the time scale at the moment when the waveform in the waveform of the switching-on switching value begins to suddenly change in the waveform of the switching-on switching value, and combining the measured number read at the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing, converting and drawing a third subsection time which is formed by the moment when the waveform in the waveform of the three-phase current of the power transmission line disappears after finishing suddenly changing and the moment when the waveform in the waveform of the switching-on switching value begins to suddenly changing in the second subsection time, and carrying information on the third subsection time as the process time from the tripping action to the reclosing action of the circuit breaker.
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