阅读说明：本技术 故障指示器性能指标精度测试方法、装置及存储介质 (Fault indicator performance index precision testing method and device and storage medium ) 是由 葛毅 莫宇 凌万水 于 2019-09-26 设计创作，主要内容包括：本发明公开了故障指示器性能指标精度测试方法、装置及存储介质,用于确定故障指示器的短路故障报警启动误差精度,该方法包括步骤：设定故障电流的检测区间[故障电流下限值min,故障电流上限值max]、故障电流中间值mid和退出门限ε；测试样品在故障电流中间值mid下的故障识别结果；若识别出故障,则使min＝min,max＝mid；若未识别出故障,则使min＝mid,max＝max；直至max-min≤ε,并以当前中间值mid下的短路故障报警启动误差为故障指示器的短路故障报警启动误差精度。本发明利用二分查找法的思想实现样品性能指标精度相关的测试,实现故障指示器性能指标精度测试自动化,使得到的精度结果更为客观,更加接近样品的实际结果。(The invention discloses a method, a device and a storage medium for testing the performance index precision of a fault indicator, which are used for determining the short-circuit fault alarm starting error precision of the fault indicator, and the method comprises the following steps: setting a fault current detection interval [ a fault current lower limit value min, a fault current upper limit value max ], a fault current intermediate value mid and an exit threshold epsilon; testing the fault identification result of the sample under the fault current intermediate value mid; if a fault is identified, then min is min and max is mid; if no fault is identified, then min is mid, max is max; until max-min is less than or equal to epsilon, and taking the short-circuit fault alarm starting error under the current intermediate value mid as the short-circuit fault alarm starting error precision of the fault indicator. The invention realizes the test related to the precision of the performance index of the sample by utilizing the thought of a binary search method, realizes the automation of the test of the precision of the performance index of the fault indicator, and leads the obtained precision result to be more objective and closer to the actual result of the sample.)

1. The method for testing the performance index precision of the fault indicator is characterized by being used for determining the short-circuit fault alarm starting error precision of the fault indicator and comprising the following steps of:

step S1: setting a fault current detection interval [ a fault current lower limit value min, a fault current upper limit value max ], a fault current intermediate value mid and an exit threshold epsilon;

step S2: testing the fault identification result of the sample under the fault current intermediate value mid;

step S3: if a fault is identified, then min is min and max is mid; if no fault is identified, then min is mid, max is max;

step S4: judging whether the epsilon is more than or equal to max-min, if so, jumping to the step S7;

step S5: calculating the fault current intermediate value mid as (min + max)/2;

step S6: repeating the steps S2-S5;

step S7: and the short-circuit fault alarm starting error under the current fault current intermediate value mid is the short-circuit fault alarm starting error precision of the fault indicator.

2. The method for testing the accuracy of the performance index of the fault indicator according to claim 1, wherein the calculation formula of the short-circuit fault alarm starting error is as follows:

wherein P is a short-circuit fault alarm starting error, I_faultFor the measured value of the fault current, I_loadMeasured value of load current, Δ I_faultFor sudden change of value of fault current, Δ I_faultIs a constant value parameter of the sample.

3. The method for testing the accuracy of the performance index of the fault indicator according to claim 2, wherein in the step S1, the set lower limit min and upper limit max of the fault current are required to satisfy: if the short-circuit fault alarm starting error qualified interval is [ P ]_min,P_max]And then the short-circuit fault alarm starting error of the sample at the set fault current lower limit value min<P_minShort-circuit fault alarm starting error of sample at set fault current upper limit value max>P_max。

4. The method of claim 2, wherein the short-circuit fault alarm start error pass interval [ P ] is defined as a short-circuit fault alarm start error pass interval [ P ]_min,P_max]Wherein P is_min＝-10％，P_max＝10％。

5. The method for testing the accuracy of the performance index of the fault indicator according to claim 2, wherein in the step S1, the fault current mid is set as: and (min + max)/2, wherein min and max are respectively a set fault current lower limit value min and a set fault current upper limit value max.

6. The method of claim 1, wherein the criteria for determining whether the sample successfully identifies the fault include detecting a remote fault signaling, detecting a local alarm result, and/or detecting a fault event, and wherein the corresponding criteria may be selected based on different fault indicator types.

7. The method of claim 1, wherein the accuracy of the short-circuit fault alarm initiation error for each phase of the fault indicator is determined separately.

8. Fault indicator performance indicator accuracy testing apparatus comprising a memory and a processor, said memory having stored thereon computer instructions executable on said processor, characterized in that said processor, when executing said computer instructions, performs the steps of the method according to any of claims 1-7.

9. Computer readable storage medium having stored thereon computer instructions, characterized in that said computer instructions when executed perform the steps of the method according to any of the claims 1-7.

Technical Field

The present disclosure relates to precision testing of fault indicators, and more particularly, to a method and an apparatus for testing precision of performance indicators of a fault indicator, and a storage medium.

Background

Aiming at the test items related to the precision detection requirements in the distribution line fault indicator test scheme, a tester usually needs to perform multiple tests and examine the test results of samples with different precision indexes, so that the actual precision of the tested samples is gradually approached. The test method has the disadvantages that the modification of test parameters is complicated, the obtained test precision result depends on the design of a test scheme, the actual precision of a tested sample cannot be objectively obtained, and the automatic realization of the test process is not facilitated. The invention discloses a precision testing method for a fault indicator, which is suitable for testing items with precision detection requirements in an automatic testing system for the fault indicator of a distribution line.

Disclosure of Invention

The invention aims to provide a method for simplifying configuration operation of test items, and the method can be used for realizing the accuracy test automation of performance indexes of a fault indicator.

In order to solve the above problems, the present invention provides a method for testing the accuracy of performance indexes of a fault indicator, which is used for determining the accuracy of a short-circuit fault alarm starting error of the fault indicator, and comprises the following steps: step S1: setting a fault current detection interval [ a fault current lower limit value min, a fault current upper limit value max ], a fault current intermediate value mid and an exit threshold epsilon; step S2: testing the fault identification result of the sample under the fault current intermediate value mid; step S3: if a fault is identified, then min is min and max is mid; if no fault is identified, then min is mid, max is max; step S4: judging whether the epsilon is more than or equal to max-min, if so, jumping to the step S7; step S5: calculating the fault current intermediate value mid as (min + max)/2; step S6: repeating the steps S2-S5; step S7: and the short-circuit fault alarm starting error under the current fault current intermediate value mid is the short-circuit fault alarm starting error precision of the fault indicator.

Preferably, the calculation formula of the short-circuit fault alarm starting error is as follows:

wherein P is a short-circuit fault alarm starting error, I_faultFor the measured value of the fault current, I_loadMeasured value of load current, Δ I_faultFor sudden change of value of fault current, Δ I_faultIs a constant value parameter of the sample.

Preferably, in step S1, the set fault current lower limit value min and the set fault current upper limit value max satisfy: such asThe interval of qualified precision of the fruit short-circuit fault alarm starting error is P_min,P_max]And then the short-circuit fault alarm starting error of the sample at the set fault current lower limit value min<P_minShort-circuit fault alarm starting error of sample at set fault current upper limit value max>P_max。

Preferably, the short-circuit fault alarm starting error qualified interval [ P ]_min,P_max]Wherein P is_min＝-10％，P_max＝10％。

Preferably, in the step S1, the set fault current mid is: and (min + max)/2, wherein min and max are respectively a set fault current lower limit value min and a set fault current upper limit value max.

Preferably, the criterion for judging whether the sample successfully identifies the fault includes detecting a fault remote signaling, detecting a local alarm result and/or detecting a fault event, and the corresponding criterion may be selected according to different fault indicator types.

Preferably, the short circuit fault alarm actuation error accuracy for each phase of the fault indicator is determined separately.

The invention also provides a device for testing the performance index precision of the fault indicator, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of any one of the methods when running the computer instructions.

The present invention also provides a computer readable storage medium having stored thereon computer instructions which, when executed, perform the steps of any of the methods described above.

Compared with the prior art, the invention has the following technical effects:

1. the embodiment of the invention realizes the test related to the precision of the sample performance index by using the thought of a binary search method, and compared with a manual design scheme, the method for repeatedly executing and gradually approaching obtains a more objective precision result which is closer to the actual result of the sample.

2. The embodiment of the invention has simple parameter configuration, does not need to repeatedly design a test scheme, simplifies the operation flow of a tester and can realize test automation.

3. The embodiment of the invention provides a plurality of criterion options for combined selection, and is suitable for testing different types of distribution line fault indicators.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments 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 obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:

fig. 1 is a flowchart of a method for testing accuracy of performance indexes of a fault indicator according to an embodiment of the present invention.

Detailed Description

The method, the apparatus and the storage medium for testing the performance index accuracy of the fault indicator provided by the present invention will be described in detail with reference to the accompanying drawings, and this embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and revise the method, apparatus and storage medium without changing the spirit and content of the present invention.

As shown in fig. 1, the method for testing the performance index accuracy of the fault indicator is used to determine the accuracy of the short-circuit fault alarm starting error of the fault indicator, record the actual output waveform of the test system by using a wave recorder while the test system simulates the output of the short-circuit fault state sequence, and obtain the test data of the test system, such as the actual duration time of the short-circuit fault current, the actual measured value of the load current, the actual measured value of the fault current, and the like, by analyzing the waveform, so as to determine the test result of the sample. The method comprises the following steps:

in this embodiment, the calculation formula of the short-circuit fault alarm starting error P is as follows:

wherein P is a short-circuit fault alarm starting error, I_faultFor the measured value of the fault current, I_loadMeasured value of load current, Δ I_faultFor sudden change of value of fault current, Δ I_faultIs a constant value parameter of the sample.

Step S1: setting a fault current detection interval [ a fault current lower limit value min, a fault current upper limit value max ], a fault current intermediate value mid and an exit threshold epsilon;

specifically, related test parameters are set according to the type, the fixed value and the test requirement of the sample, and mainly comprise a load current output value, a fault current sudden change fixed value delta I of the sample_faultThe fault current lower limit value min, the fault current upper limit value max, the fault current intermediate value mid, the exit condition epsilon and the criterion for successfully identifying the fault by the sample;

here, the above parameters are explained by taking a specific test scenario structure as an example: in the test process, the test system repeatedly simulates and outputs a short-circuit fault state sequence, such as: the method comprises the steps of outputting load current 20A in an initial state for 20s, then suddenly changing the phase current A to 300A, keeping other phase currents unchanged for 0.5s, and finally returning the three-phase output current to 0, wherein the load current output value is 20A, and the load current measured value I is_loadIt means the measured value of 20A, the set value of the fault current is 300A, and the measured value of the fault current is I_faultThe actual measurement value of 300A is set as min, mid, and max, which correspond to the lower limit of the fault current setting value, the middle value of the fault current setting value, and the upper limit of the fault current setting value.

In step S1, the set fault current lower limit value min and the set fault current upper limit value max are required to satisfy: if the short-circuit fault alarm starting error precision qualified interval is [ P ]_min,P_max]And then the short-circuit fault alarm starting error of the sample at the set fault current lower limit value min<P_minShort-circuit fault alarm starting error of sample at set fault current upper limit value max>P_maxIn this embodiment, take P_min＝-10％，P_max10 percent; the intermediate value of the fault current is generally set to (min + max)/2, or the actual short-circuit fault alarm starting error of the sample can be estimated according to actual experience, if the fault current corresponding to the short-circuit fault alarm starting error is close to max, the value of mid is set to be close to max, otherwise, the value of mid is set to be close to min, so that the iteration number is reduced;

the criterion for judging whether the sample successfully identifies the fault comprises fault remote signaling detection, local alarm result detection (namely flash detection and card turning action results), fault event detection and the like, and can be selected in a combined manner according to the fault alarm mode of the detected sample, so that the test requirements of fault indicators of different types of distribution lines are met.

For detecting fault remote signaling, setting fault remote signaling (A \ B \ C phase short-circuit fault) corresponding to three phases, and indicating that the sample identifies the short-circuit fault of the corresponding phase; for the detection of a local alarm result, if a sample identifies a short circuit fault of a certain phase, the acquisition unit of the phase can flash or turn over the card to alarm; for detecting a fault event, the sample identification fault sends a fault event message to the sample identification fault, and the fault event message contains identified fault information. The fault indicator may be classified into a remote transmission type and a local type according to whether or not it has a communication function: the local type generally can only alarm locally, such as a transient characteristic type local fault indicator and the like, the alarm type comprises flashing, turning over the cards, flashing and turning over the cards, the manufacturer determines that the criterion generally only selects 'detecting the local alarm result'; the remote transmission type can generally carry out fault alarm through fault remote signaling setting, local alarm and fault information uploading, for example, a transient characteristic type remote transmission fault indicator, a transient recording type remote transmission fault indicator and the like, the 'fault remote signaling detection' and the 'local alarm detection result' are generally selected according to criteria, and the 'fault event detection' is an unnecessary item and is determined whether to detect according to the test requirement. In the case where a plurality of criteria are selected, the sample can be regarded as an identification failure only if all the criteria of the sample result in identification failures.

Step S2: testing the fault identification result of the sample under the fault current intermediate value mid;

in this embodiment, the acquisition units of the a phase, the B phase, and the C phase of the sample are sequentially used as test objects, and steps S2-S7 are repeatedly executed to obtain the short-circuit fault alarm starting error precision of the corresponding phase of the sample, which is described below with the a phase acquisition unit as an example:

firstly, respectively detecting the identification fault results of a phase A acquisition unit of a sample at a fault current initial lower limit value min and a current initial lower limit value max: if the sample identifies a fault at the initial lower limit value min of the fault current, the short-circuit fault alarm starting error P of the sample A-phase acquisition unit is less than-10 percent, which indicates that the sample A-phase acquisition unit is unqualified, the test of the phase A is quitted, and the next phase is tested; and if the sample cannot identify the fault at the initial upper limit value Imax, the short-circuit fault alarm starting error P of the sample A-phase acquisition unit is more than 10 percent, which indicates that the sample A-phase acquisition unit is unqualified, and the sample A-phase acquisition unit exits the test of the phase A and enters the test of the next phase.

Step S3: if a fault is identified, then min is min and max is mid; if no fault is identified, then min is mid, max is max;

further, if the sample identifies a fault at the intermediate value mid, the fault current corresponding to the actual short-circuit fault alarm starting error of the sample is smaller than mid, and the fault current detection interval is updated to [ min, max ], wherein min is min and max is mid; and if the sample does not identify the fault, the fault current corresponding to the actual short-circuit fault alarm starting error of the sample is greater than mid, and the fault current detection interval is updated to [ min, max ], wherein min is mid and max is max.

Step S4: judging whether the epsilon is more than or equal to max-min, if so, jumping to the step S7;

step S5: calculating the intermediate value mid ═ min + max)/2;

in this embodiment, the intermediate value mid is updated by bisection.

Step S6: repeating the steps S2-S5;

step S7: and the short-circuit fault alarm starting error under the current intermediate value mid is the short-circuit fault alarm starting error precision of the fault indicator.

And finally, obtaining a test conclusion according to the test result of each phase acquisition unit of the sample, and generating a test record.

The embodiment of the invention is also suitable for the precision test of the performance indexes of the fault indicator, such as the minimum identifiable short-circuit fault current duration, short-circuit fault alarm along with the load change and the like.

The embodiment of the invention also provides a device for testing the performance index precision of the fault indicator, which comprises a memory and a processor, wherein the memory is stored with a computer instruction capable of running on the processor, and the processor executes the steps of any one of the methods when running the computer instruction.

Embodiments of the present invention further provide a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method of any one of the above-mentioned steps is performed.

The disclosure above is only one specific embodiment of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.