CN109001664B - Transient recording type fault indicator waveform comparison test method - Google Patents
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- CN109001664B CN109001664B CN201810619135.4A CN201810619135A CN109001664B CN 109001664 B CN109001664 B CN 109001664B CN 201810619135 A CN201810619135 A CN 201810619135A CN 109001664 B CN109001664 B CN 109001664B
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Abstract
The invention provides a waveform comparison test method of a transient recording type fault indicator, which is suitable for transient performance analysis of the transient recording type fault indicator. The invention can comprehensively compare the waveforms recorded by the transient recording type fault indicator and the wave recorder through five types of judgment factors, and comprehensively verify the wave recording performance of the transient recording type fault indicator.
Description
Technical Field
The invention relates to the technical field of power distribution automation, in particular to a waveform comparison test method for a transient recording type fault indicator.
Background
Distribution automation is an important foundation of an intelligent power distribution network, and a distribution line fault indicator is an important component in a distribution automation system and is used for realizing fault positioning. Transient recording type fault indicators are one of the main types of fault indicators. The accuracy of fault basic data and the correctness of a fault research and judgment result are directly determined by the recording performance of the transient recording type fault indicator. Therefore, the method for testing the wave recording performance of the transient wave recording type fault indicator through the technical means is an important work for the field application of the transient wave recording type fault indicator.
At present, no more accurate and considerable waveform judging scheme exists in the wave recording performance test of the transient wave recording type fault indicator, and the performance verification and the field application of the transient wave recording type fault indicator are influenced. The invention provides a waveform comparison test technology of a transient recording type fault indicator based on similarity operation.
Disclosure of Invention
The invention provides a waveform comparison test method of a transient recording type fault indicator, which can comprehensively compare waveforms recorded by the transient recording type fault indicator and a wave recorder through five types of judgment factors and comprehensively verify the wave recording performance of the transient recording type fault indicator.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a waveform comparison test method for a transient recording type fault indicator is suitable for transient performance analysis of the transient recording type fault indicator, and is specifically characterized by comprising the following steps:
step one, recording a typical fault waveform in a control background;
secondly, amplifying the typical fault waveform by using a high-precision power amplifier and a voltage and current transformer, and inputting the amplified typical fault waveform to a true distribution line for inverting the typical fault waveform;
thirdly, respectively recording waves by using a wave recorder and a transient wave recording type fault indicator, and recording a waveform file;
and fourthly, comparing the similarity of the waveforms recorded by the wave recorder and the transient wave recording type fault indicator by adopting a similarity calculation method, and judging the wave recording performance of the transient wave recording type fault indicator.
Further, the similarity calculation method judges the wave recording performance through 5 criteria, if all the criteria meet the requirements, the wave recording performance of the fault indicator is considered to be qualified, the 5 criteria judge the wave recording performance by collecting 5 types of characteristic quantities, and the 5 types of characteristic quantities are as follows:
(1) the steady-state effective value trends before and after the waveform transient fault;
(2) the amplitude difference of the first maximum transient characteristic quantity;
(3) the amplitude difference value of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity;
(4) the time difference value of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity;
(5) and in two fault cycle periods starting from the fault catastrophe point, the amplitude exceeds the set value m times.
Further, the steady state effective value trends of the waveform before and after the transient fault are the same and serve as a first criterion, if the steady state quantity trends of the voltage and the current of each phase of the waveform collected by the wave recorder and the transient wave recording type fault indicator before and after the fault are consistent, the first criterion is considered to be met, and if one phase of the waveform is inconsistent, the first criterion is considered not to be met.
Further, the amplitude of the first maximum transient characteristic quantity within +/-10% serves as a second criterion, if the amplitude of the first maximum transient characteristic quantity of the waveform collected by the wave recorder and the transient wave recording type fault indicator is within +/-10%, the second criterion is considered to be met, and if the amplitude of the first maximum transient characteristic quantity is not within +/-10%, the second criterion is considered not to be met.
Further, the difference between the amplitudes of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity is within ± 10% as a third criterion, if the difference between the amplitudes of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity of the waveforms collected by the wave recorder and the transient wave recording type fault indicator is within ± 10%, the third criterion is considered to be satisfied, and if the difference is not within ± 10%, the third criterion is considered not to be satisfied.
Further, the time difference between the first maximum transient characteristic quantity and the second maximum transient characteristic quantity is within ± 10% as a fourth criterion, if the time difference between the first maximum transient characteristic quantity and the second maximum transient characteristic quantity of the waveforms collected by the wave recorder and the transient wave recording type fault indicator is within ± 10%, the fourth criterion is considered to be satisfied, and if the time difference is not within ± 10%, the fourth criterion is considered not to be satisfied.
Further, whether the frequency of the amplitude exceeding a set value is the same in two fault cycle periods starting from the fault mutation point is a fifth criterion, if the frequency of the waveform exceeding the set value collected by the wave recorder and the transient recording type fault indicator is the same in the two fault cycle periods starting from the fault mutation point, the fifth criterion is considered to be met, and if the frequency of the waveform exceeding the set value is different, the fifth criterion is considered not to be met.
Further, the searching principle of the fault catastrophe point is as follows: and taking the steady state effective value before the fault as a reference, starting searching from the starting point of the wave recording waveform, and taking the first point which is greater than the steady state effective value before the fault as a fault catastrophe point.
The waveform comparison testing method of the transient recording type fault indicator can test the performance index of the transient recording type fault indicator through the waveform comparison principle, and makes up the vacancy in the aspect of the recording performance test of the conventional transient recording type fault indicator. The detection efficiency of the transient recording fault indicator can be improved, and remarkable social benefits and economic benefits are created.
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FIG. 1 is a schematic flow chart of a transient recording type fault indicator waveform comparison test method according to the present invention;
FIG. 2 is a schematic diagram of a processing scheme for criterion in the test method of the present invention;
FIG. 3 is a schematic diagram of the second, third and fourth processing schemes of the test method of the present invention;
FIG. 4 is a schematic diagram of a five-criterion processing scheme in the testing method of the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for comparing and testing waveforms of a transient recording type fault indicator according to the present invention, which comprehensively evaluates the recording performance of the transient recording type fault indicator by a waveform similarity calculation method, listing five types of judgment factors.
The specific implementation mode of the invention is that under the condition of normal communication, typical fault waveforms are recorded in a control background, the typical fault waveforms are amplified by a high-precision power amplifier and a voltage and current transformer and input to a true distribution line, and a wave recorder and a transient wave recording type fault indicator are used for respectively recording waves and recording waveform files. And comparing the similarity of the waveforms recorded by the wave recorder and the transient wave recording type fault indicator, and judging the wave recording performance of the transient wave recording type fault indicator.
The waveform comparison adopts a similarity algorithm to carry out similarity comparison, the similarity algorithm collects 5 types of characteristic quantities to carry out recording performance judgment, and the judgment content and the realization mode of each criterion are as follows:
as shown in fig. 2, the first full cycle of the waveform is used to calculate the effective value IA1 before the a-phase current fault, then the 12 th cycle (according to the requirements of relevant specifications, the recording range of the transient recording-type fault indicator is 12 cycles, wherein 4 cycles are pre-recorded before the fault point) is used to calculate the effective value IA2 after the a-phase current fault, the sizes of IA1 and IA2 are compared and recorded as mA, if IA1 is greater than or equal to IA2 and recorded as 1, and if IA1 is less than IA2 and recorded as 0, the method is used to calculate the comparison results mB and mC of the effective values of the B-phase current and the C-phase current; and then, the comparison results nA, nB and nC of the three-phase voltage effective values are calculated by the same method. And if the six characteristic values of the waveforms recorded by the wave recorder and the transient wave recording type fault indicator are the same, the criterion one is considered to be met.
The amplitude difference of the first maximum transient characteristic quantity according to the second criterion
The three-phase current magnitude is selected to carry out the analysis and calculation, taking the phase A as an example, the maximum instantaneous value IA3 before the phase A current fault is calculated by utilizing the first whole cycle wave of the waveform, the searching is carried out according to the waveform time sequence until the first point which is larger than the instantaneous value and larger than IA3 is found, and the point is marked as a catastrophe point. And then, the point is searched to the zero point according to the sudden change point according to the waveform time sequence, and the maximum value between the sudden change point and the zero point is recorded as the first maximum transient characteristic amount IA4 (as shown in FIG. 3). If the fault does not occur in phase A, namely a value larger than IA3 cannot be found, the steps are sequentially repeated in phase B and phase C until the amplitude of the first maximum transient characteristic quantity is found, and if the difference value of the characteristic values of the waveforms recorded by the wave recorder and the transient wave recording type fault indicator is within +/-10%, the criterion two is considered to be met.
Criterion three, amplitude difference value between first maximum transient characteristic quantity and second maximum transient characteristic quantity
And selecting three-phase current magnitude to carry out the analysis and calculation, taking the phase A as an example, finding a mutation point, finding the mutation point to a zero point according to the sequence of waveform time of the mutation point, and recording the maximum value between the mutation point and the zero point as the first maximum transient characteristic IA 4. Then, a second zero point is found from the zero points, the maximum value between the two points is recorded as a second maximum transient characteristic amount IA5 (as shown in fig. 3), and the difference between IA4 and IA5 is recorded as a maximum amplitude difference | IA |. If the fault does not occur in the phase A, the steps are sequentially repeated in the phase B and the phase C until the maximum amplitude difference is found, and if the difference of the characteristic values of the waveforms recorded by the wave recorder and the transient wave recording type fault indicator is within +/-10%, the criterion three is considered to be met.
Criterion four, time difference value between first maximum transient characteristic quantity and second maximum transient characteristic quantity
The three-phase current is selected for this analysis and calculation, taking phase a as an example, and after finding the discontinuity point and the two maximum transient characteristic amounts IA4 and IA5, the time difference between IA4 and IA5 is recorded as the extreme time difference t (as shown in fig. 3). If the fault does not occur in the phase A, the steps are sequentially repeated in the phase B and the phase C until an extreme value time difference is found, and if the difference value of the characteristic value of the waveforms recorded by the wave recorder and the transient wave recording type fault indicator is within +/-10%, the criterion four is considered to be met.
And judging whether the times that the amplitude exceeds a set value are the same in two fault cycle periods starting from a fault catastrophe point.
After the mutation point and the first maximum transient characteristic quantity are found, the absolute value of the first maximum transient characteristic quantity is recorded as | IA6| (as shown in figure 4) by taking 60% of the first maximum transient characteristic quantity as a reference, 2 cycles are scanned, and the times that the absolute value of the instantaneous value exceeds 60% | IA6| are recorded. And in two fault cycle periods starting from the fault catastrophe point, the frequency of the waveforms collected by the wave recorder and the transient recording type fault indicator exceeding a set value is the same, the criterion five is considered to be met, and if the frequency of the waveforms is different, the criterion five is considered not to be met.
After the five criteria are judged according to the waveform, if the five criteria are all met, the wave recording performance of the transient recording type fault indicator is considered to be qualified, and if one or more criteria are not met, the wave recording performance of the transient recording type fault indicator is considered to be unqualified.
The waveform comparison testing method of the transient recording type fault indicator can test the performance index of the transient recording type fault indicator through the waveform comparison principle, and makes up the vacancy in the aspect of the recording performance test of the conventional transient recording type fault indicator. The detection efficiency of the transient recording fault indicator can be improved, and remarkable social benefits and economic benefits are created.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (2)
1. A waveform comparison test method for a transient recording type fault indicator is characterized by comprising the following steps: step one, recording a typical fault waveform in a control background; secondly, amplifying the typical fault waveform by using a high-precision power amplifier and a voltage and current transformer, and inputting the amplified typical fault waveform to a true distribution line for inverting the typical fault waveform; thirdly, respectively recording waves by using a wave recorder and a transient wave recording type fault indicator, and recording a waveform file; fourthly, comparing the similarity of the waveforms recorded by the wave recorder and the transient wave recording type fault indicator by adopting a similarity calculation method, and judging the wave recording performance of the transient wave recording type fault indicator;
the similarity calculation method judges the wave recording performance through 5 criteria, if all the criteria meet the requirements, the wave recording performance of the fault indicator is considered to be qualified, the 5 criteria judge the wave recording performance by collecting 5 types of characteristic quantities, and the 5 types of characteristic quantities are as follows: (1) the steady-state effective value trends before and after the waveform transient fault; (2) the amplitude difference of the first maximum transient characteristic quantity; (3) the amplitude difference value of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity; (4) the time difference value of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity; (5) the frequency that the amplitude value exceeds a set value m in two fault cycle periods starting from a fault catastrophe point;
the steady state effective value trends of the waveform before and after the transient fault are the same and serve as a first criterion, if the steady state quantity trends of the voltage and the current of each phase of the waveform collected by the wave recorder and the transient wave recording type fault indicator before and after the fault are consistent, the first criterion is considered to be met, and if one phase of the waveform is inconsistent, the first criterion is considered not to be met;
the amplitude difference of the first maximum transient characteristic quantity is within +/-10% as a second criterion, if the amplitude difference of the first maximum transient characteristic quantity of the waveforms acquired by the wave recorder and the transient wave recording type fault indicator is within +/-10%, the second criterion is considered to be met, and if the amplitude difference is not within +/-10%, the second criterion is considered not to be met;
the difference value of the amplitude values of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity is within +/-10% as a third criterion, if the difference value of the amplitude values of the first maximum transient characteristic quantity and the second maximum transient characteristic quantity of the waveforms collected by the wave recorder and the transient wave recording type fault indicator is within +/-10%, the third criterion is considered to be met, and if the difference value is not within +/-10%, the third criterion is considered not to be met;
if the time difference between the first maximum transient characteristic quantity and the second maximum transient characteristic quantity of the waveform acquired by the wave recorder and the transient wave recording type fault indicator is within +/-10%, the criterion is considered to be met by four, and if the time difference is not within +/-10%, the criterion is considered to be not met by four;
whether the times of the amplitude exceeding a set value in two fault cycle periods starting from a fault mutation point are the same is a fifth criterion, if the times of the waveforms collected by the wave recorder and the transient recording type fault indicator exceeding the set value in the two fault cycle periods starting from the fault mutation point are the same, the fifth criterion is considered to be met, and if the times of the waveforms are different, the fifth criterion is considered not to be met.
2. The method for waveform comparison testing of a transient recording-type fault indicator of claim 1, wherein: the searching principle of the fault catastrophe point is as follows: and taking the steady state effective value before the fault as a reference, starting searching from the starting point of the wave recording waveform, and taking the first point which is greater than the steady state effective value before the fault as a fault catastrophe point.
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| CN109470915A (en) * | 2018-12-17 | 2019-03-15 | 国网内蒙古东部电力有限公司检修分公司 | The monitoring of D.C. high voltage transmission earthing pole earth current and assessment system under microclimate |
| CN110045228B (en) * | 2019-04-09 | 2020-10-13 | 平高集团有限公司 | Fault indicator device, system and power distribution network system |
| CN110095743B (en) * | 2019-04-14 | 2024-03-29 | 广西电网有限责任公司南宁供电局 | Distribution network terminal wave recording performance test module and waveform fitting method thereof |
| CN110579682B (en) * | 2019-08-22 | 2021-10-15 | 国网安徽省电力有限公司 | Fault recording data transient homologous comparison method and device |
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| CN112748366B (en) * | 2021-02-07 | 2022-08-12 | 石家庄科林电气股份有限公司 | Method for judging short-circuit fault of transient recording type fault indicator |
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