CN109375007B - Failure evaluation method, device, equipment and storage medium of measurement and control protection device - Google Patents
Failure evaluation method, device, equipment and storage medium of measurement and control protection device Download PDFInfo
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Abstract
The invention discloses a failure evaluation method of a measurement and control protection device, which judges the accuracy of the current electrical parameters of the measurement and control protection device measured after an accelerated test after determining the initial electrical parameters of the measurement and control protection device to be tested and the current electrical parameters after the accelerated test, aims to obtain target electrical parameters meeting requirements, eliminates the current electrical parameters not meeting the requirements, and considers random errors in the data acquisition of the measurement and control protection device; and finally, the failure evaluation of the measurement and control protection device is realized according to the initial electrical parameters and the target electrical parameters meeting the requirements. Therefore, the evaluation method can be used for judging the accuracy of the electrical parameters measured after the experiment, and compared with the traditional evaluation mode, the failure evaluation accuracy of the measurement and control protection device is improved. In addition, the invention also discloses a failure evaluation device, equipment and a storage medium of the measurement and control protection device, and the effects are as above.
Description
Technical Field
The invention relates to the field of power equipment evaluation, in particular to a failure evaluation method, a failure evaluation device, failure evaluation equipment and a failure evaluation storage medium for a measurement and control protection device.
Background
The measurement and control protection device can be influenced by various environmental factors in the outdoor operation process, wherein vibration, salt mist, temperature and humidity are main factors influencing the outdoor operation performance of the measurement and control protection device. At present, research workers at home and abroad establish an empirical base outdoors, and observe the attenuation of the measurement and control protection device in the outdoor performance from the aspects of appearance, voltage, current, power, remote control performance and mechanical performance, however, under the conventional environment, the influence of environmental stress factors on the electrical performance of the measurement and control protection device is small, and the problems of failure mode, reliability and the like of the measurement and control protection device can be determined only by observing and testing for a long time and collecting related data.
Although some detection and certification institutions and research institutes adopt an indoor accelerated test method to analyze failure mechanism and reliability of the measurement and control protection device, the accelerated test method is mostly used for carrying out tests on the basis of the DL/T721-2013 standard, and common accelerated tests include a high-temperature test, a low-temperature test and the like. Specifically, the change of electrical parameters of the measurement and control protection device before and after the test is compared in a manual mode, the change of the appearance and the mechanical property of the measurement and control protection device is compared to evaluate the failure performance of the measurement and control protection device, only simple comparison is carried out on data before and after the test, and the influence caused by random errors in the data acquisition of the measurement and control protection device is not considered, namely, the data measured after the test is directly compared with the data before the test, so that the failure performance evaluation of the measurement and control protection device is realized, the data measured after the test is not processed, and the failure performance evaluation accuracy of the measurement and control protection device is lower.
Therefore, the problem of how to improve the failure evaluation accuracy of the measurement and control protection device is an urgent problem to be solved by the technical personnel in the field.
Disclosure of Invention
The embodiment of the application provides a failure evaluation method, a failure evaluation device, failure evaluation equipment and a storage medium of a measurement and control protection device, and solves the problem that the failure evaluation accuracy of the measurement and control protection device in the prior art is low.
In order to solve the technical problem, the invention provides a failure evaluation method of a measurement and control protection device, which comprises the following steps:
determining initial electrical parameters of a measurement and control protection device to be tested;
acquiring current electrical parameters of the measurement and control protection device after accelerated test in an accelerated test box;
detecting the accuracy of the current electrical parameters to obtain target electrical parameters meeting requirements;
and evaluating the failure of the measurement and control protection device according to the initial electrical parameters and the target electrical parameters.
Preferably, the determining of the initial electrical parameters of the measurement and control protection device to be tested specifically includes:
the initial electrical parameters are determined according to the DL/T721-2013 standard.
Preferably, the acquiring of the current electrical parameter of the measurement and control protection device after the accelerated test in the accelerated test box specifically includes:
taking temperature, humidity and salt fog as the acceleration stress of the acceleration test box according to the GB/T2423.18 standard;
carrying out an acceleration test on the measurement and control protection device in the acceleration stress environment;
and acquiring the current electrical parameters of the measurement and control protection device after the accelerated test.
Preferably, the detecting the accuracy of the current electrical parameter to obtain a target electrical parameter meeting the requirement specifically includes:
and detecting the accuracy of the current electrical parameter in a mode of determining the discrete degree of the current electrical parameter to obtain the target electrical parameter.
Preferably, the detecting the accuracy of the current electrical parameter by determining the degree of dispersion of the current electrical parameter specifically includes:
and determining the discrete degree of the current electrical parameter by utilizing a robust Z-ratio score method so as to detect the accuracy of the current electrical parameter.
Preferably, the evaluating the failure of the measurement and control protection device according to the initial electrical parameter and the target electrical parameter specifically includes:
calculating an average value and an uncertainty of the initial electrical parameter and the target electrical parameter, respectively;
calculating the failure evaluation index of the measurement and control protection device according to the average value and the uncertainty;
and evaluating the failure of the measurement and control protection device according to the failure evaluation index.
Preferably, the evaluating the failure of the measurement and control protection device according to the failure evaluation index specifically includes:
judging whether the invalidity evaluation index is smaller than a threshold value;
if so, representing that the measurement and control protection device does not fail;
if not, the measurement and control protection device is represented to be invalid.
In order to solve the above technical problem, the present invention further provides a failure evaluation device of a measurement and control protection device corresponding to the failure evaluation method of the measurement and control protection device, including:
the determining module is used for determining initial electrical parameters of the measurement and control protection device to be tested;
the acquisition module is used for acquiring the current electrical parameters of the measurement and control protection device after accelerated test in the accelerated test box;
the accuracy detection module is used for detecting the accuracy of the current electrical parameter so as to obtain a target electrical parameter meeting the requirement;
and the evaluation module is used for evaluating the failure of the measurement and control protection device according to the initial electrical parameters and the target electrical parameters.
In order to solve the above technical problem, the present invention further provides a failure evaluation device of a measurement and control protection device corresponding to the failure evaluation method of the measurement and control protection device, including:
a memory for storing a computing program;
and the processor is used for executing the computer program to realize the steps of any one of the failure evaluation methods of the measurement and control protection device.
In order to solve the technical problem, the present invention further provides a computer readable storage medium corresponding to the failure evaluation method of the measurement and control protection device, where a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the steps of any one of the failure evaluation methods of the measurement and control protection device.
Compared with the prior art, the failure evaluation method of the measurement and control protection device provided by the invention has the advantages that after the initial electrical parameters of the measurement and control protection device to be tested and the current electrical parameters after an accelerated test are determined, the accuracy of the current electrical parameters of the measurement and control protection device after the accelerated test is judged, so that the target electrical parameters meeting the requirements are obtained, the current electrical parameters which do not meet the requirements are eliminated, and the random error in the data acquisition of the measurement and control protection device is considered; and finally, the failure evaluation of the measurement and control protection device is realized according to the initial electrical parameters and the target electrical parameters meeting the requirements. Therefore, the evaluation method can be used for judging the accuracy of the current electrical parameters measured after the experiment, and compared with the evaluation mode in the prior art, the failure evaluation accuracy of the measurement and control protection device is improved. In addition, the invention also provides a failure evaluation device, equipment and a storage medium of the measurement and control protection device, and the effect is as above.
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Fig. 1 is a flowchart of a failure evaluation method of a measurement and control protection device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a failure evaluation device of the measurement and control protection device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a failure evaluation device of the measurement and control protection device according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a failure evaluation method, a device, equipment and a storage medium of a measurement and control protection device, which can solve the problem of low accuracy of failure evaluation of the measurement and control protection device.
In order that those skilled in the art will better understand the concept of the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Fig. 1 is a flowchart of a failure evaluation method of a measurement and control protection device according to an embodiment of the present invention, and as shown in fig. 1, the evaluation method includes:
s101: and determining initial electrical parameters of the measurement and control protection device to be tested.
The method specifically comprises the steps of firstly, manually checking the appearance of the measurement and control protection device to be tested, screening out 1 measurement and control protection device with a good initial state, obtaining initial electrical parameters of the measurement and control protection device, and then inputting the initial electrical parameters into a computer system. Considering the accuracy of data acquisition, as a preferred embodiment, determining the initial electrical parameters of the measurement and control protection device to be tested specifically includes: the initial electrical parameters were determined according to the DL/T721-2013 standard. Specifically, before the measurement and control protection device is subjected to accelerated test, the electrical parameters of the measurement and control protection device are tested under the standard test condition according to the DL/T721-2013 standard, and initial electrical parameter data are obtained: to make the acquired data representative, the initial electrical parameters may preferably include voltage, current, frequency, and power.
The measurement and control protection device in the embodiment of the application is composed of an alternating current analog input port, a state quantity input port, a remote control input port, a communication port and the like, is connected with the alternating current analog input port through an alternating current signal source, simulates the electrified running state of the measurement and control protection device, can adopt a digital multimeter, a power meter and the like, measures the electric parameters (voltage, current, frequency, power and the like) of the measurement and control protection device, and is connected with a computer through the communication interface to monitor the running condition of the measurement and control protection device.
S102: and acquiring the current electrical parameters of the measurement and control protection device after accelerated test in the accelerated test box.
Specifically, the measurement and control protection device is placed in an acceleration test box to perform an acceleration test on the measurement and control protection device, and then electrical parameters (current electrical parameters) after the acceleration test are obtained. Preferably, the current electrical parameters include voltage, current, frequency and power.
In order to make the electrical parameters of the measurement and control protection device measured after the accelerated test more accurate so as to improve the failure evaluation accuracy of the measurement and control protection device, as a preferred embodiment, obtaining the current electrical parameters of the measurement and control protection device after the accelerated test in the accelerated test box specifically includes:
taking temperature, humidity and salt fog as acceleration stress of an acceleration test box according to the GB/T2423.18 standard;
carrying out an accelerated test on the measurement and control protection device in an accelerated stress environment;
and acquiring the current electrical parameters of the measurement and control protection device after the accelerated test.
Specifically, an accelerated test is carried out in an accelerated test box according to the regulation in the standard GB/T2423.18 by taking temperature, humidity and salt fog as accelerated stress, wherein salt solution is sprayed for 2h in each cycle, and then a measurement and control protection device is kept in the accelerated test box for wet-heat storage for 20-22 h; thereafter, a further storage period was carried out for a period of 3d under standard atmospheric conditions (temperature 23. + -. 2 ℃ C., relative humidity 45% -55%). In practical application, in order to enable the accuracy of the electrical parameters measured after the test to be higher, the accelerated test can be performed for multiple times in a circulating manner, in the embodiment of the application, the circulating test can be performed for 8 times, the circulating time can be set to 96h, the time spent in the accelerated test is 768h when the accelerated test is ended, and the measurement and control protection device to be tested is taken out after each circulation is ended to perform the test of the electrical parameters under the standard test condition, so that the current electrical parameter data of the measurement and control protection device is obtained.
S103: and detecting the accuracy of the current electrical parameters to obtain the target electrical parameters meeting the requirements.
Specifically, after obtaining the current electrical parameters of the measurement and control protection device after the accelerated test, the accuracy of the current electrical parameters is detected, so that the target electrical parameters meeting the requirements are determined, and the current electrical parameters not meeting the requirements are eliminated.
In order to quickly determine the accuracy of the current electrical parameters of the measurement and control protection device after the test under the condition that the damage degree of the measurement and control protection device is small, as a preferred implementation mode, the method for detecting the accuracy of the current electrical parameters to obtain the target electrical parameters meeting the requirements specifically comprises the following steps:
and detecting the accuracy of the current electrical parameter in a mode of determining the discrete degree of the current electrical parameter to obtain the target electrical parameter.
Specifically, the deviation degree of each data in the current electrical parameter is judged, for example, the deviation degree of each data from the reference line is judged, and then the data with large deviation degree is removed, and the data with small deviation degree is reserved as the target electrical parameter. Of course, the accuracy of the current electrical parameter obtained after the experiment can be judged by determining the degree of dispersion of the current electrical parameter, and the accuracy of the current electrical parameter can also be judged by other methods, which is not limited in the present invention. For example, multiple acceleration tests are performed on the measurement and control protection device to obtain multiple groups of current electrical parameters, then the current electrical parameters with high accuracy are determined by calculating the average value of the multiple groups of electrical parameters, specifically, the average value of the current electrical parameters obtained after each acceleration test is calculated, finally, the current electrical parameters after one acceleration test with stable average values are selected as the last electrical parameters of the acceleration test, and the accuracy of the current electrical parameters is determined by only obtaining the average value through multiple tests, so that the device performance of the measurement and control protection device is greatly damaged, therefore, in practical application, the accuracy of the current electrical parameter is detected by determining the discrete degree of the current electrical parameter after selecting one test, and further obtaining target electrical parameters meeting the requirements, and eliminating the current electrical parameters not meeting the requirements. Other ways of determining the accuracy of the current electrical parameter obtained after the accelerated test are not described herein again.
In order to make the determined degree of dispersion of the current electrical parameter more accurate, as a preferred embodiment, the detecting the accuracy of the current electrical parameter by determining the degree of dispersion of the current electrical parameter specifically includes:
and determining the discrete degree of the current electrical parameter by using a robust Z ratio fraction method so as to detect the accuracy of the current electrical parameter, and finally obtaining the target electrical parameter.
Firstly, determining the standardized sum S of the initial electrical parameter and the target electrical parameter, wherein the calculation mode of the standardized sum is that the sum of two measurement data results is divided by
The value obtained thereafter; and then, solving the steady Z ratio score by using the data obtained after standardization and finally determining the dispersion degree of the current electrical parameter through the steady Z ratio score to obtain the target electrical parameter meeting the requirement (namely obtaining the electrical parameter with low dispersion). In practical applications, after two electrical parameters of one type are processed, two electrical parameters of another type are processed in the same manner, for example, a voltage parameter measured in two times before and after the current parameter measured in two times before and after the voltage parameter measured in two times before and after the current parameter measured in two times before.
The specific process for determining the degree of dispersion of the current electrical parameter by using the robust Z-ratio score method is as follows:
firstly, determining a median value in a current electrical parameter sequence, and if the number N of the current electrical parameters is an odd number, determining the median value in the sequence of the current electrical parameters
The numerical value corresponding to the position is a median xM(ii) a If N is an even number, the first of the sequence
And a first
The average value of the values corresponding to the positions is used as the median xM。
Second, the quartile value and the quartile range (IQR) in the current sequence of electrical parameters are determined, the upper quartile value Q3, also known as the high quartile value, is a set of ordered values above which 1/4 is as high as possible, i.e., 3/4 (75%) is below this value, and the lower quartile value Q1, also known as the low quartile value, is a set of ordered values below which 1/4 (25%) is as high as possible, i.e., 3/4 is above this value. When N is 9+4N, N is 0,1 …, the positions of the values of Q3 and Q1 in the sequence are integers, and the positions of the values of Q3 and Q1 in the sequence are determined by the method of the suji interpolation. The difference between the upper quartile Q3 and the lower quartile Q1 is called the interquartile range (IQR), i.e., IOR-Q3-Q1.
Third, a normalized quartile range (Norm IQR) in the current sequence of electrical parameters is determined, which is defined as the quartile range IQR multiplied by a factor 0.7413 to be the normalized quartile range Norm IQR. It can be proved that the Norm IQR is equal to the standard deviation in the normal distribution, which is processed by the robust technique to represent a statistic of the data dispersion degree, i.e. Norm IQR 0.7413IQR 0.7413(Q3-Q1), and the specific formula derivation process of normalizing the quartile distance can be referred to in the prior art, and will not be described herein again.
Fourth, a Robust coefficient of variation (Robust Cv) is determined: the definition is normalized quartering distance divided by median and expressed as a percentage, i.e.:
robust coefficients of variation may compare variability between current electrical parameters.
Fifthly, determining the robust Z ratio fraction of the current electrical parameter, wherein the calculation formula is as follows:
Z＝S-xM/Norm IQR
wherein S is the normalized sum, xMIs a median value, NormIQR is the normalized quartile range.
In practical application, when the calculated steady Z fraction | Z | is less than or equal to 2, the corresponding electrical parameters can be determined to meet the requirements and need to be reserved; when 2< | Z | <3, the corresponding electrical parameters can be determined to be not in accordance with the requirements and need to be deleted; when the calculated | Z | ≧ 3, the corresponding electrical parameter can be determined to be not very accurate, but the influence on the evaluation result is small, and the evaluation result can be used or not used, and is determined according to the actual condition. The results were unsatisfactory.
S104: and evaluating the failure of the measurement and control protection device according to the initial electrical parameters and the target electrical parameters.
Specifically, after the target electrical parameters of the measurement and control protection device after the accelerated test are determined, the inefficacy evaluation of the measurement and control protection device is realized by comparing the difference between the initial electrical parameters and the target electrical parameters.
In order to simplify the computational complexity, as a preferred embodiment, the evaluating the failure performance of the measurement and control protection device according to the initial electrical parameter and the target electrical parameter specifically includes:
respectively calculating the average value and the uncertainty of the initial electrical parameter and the target electrical parameter;
calculating the failure evaluation index of the measurement and control protection device according to the average value and the uncertainty;
and evaluating the failure of the measurement and control protection device according to the failure evaluation index.
Firstly, calculating the average value of the initial electrical parameter and the target electrical parameter, wherein the calculation formula is as follows:
wherein,
representing the average value, n the number of data, di the i-th electrical parameter value.
Secondly, calculating uncertainty of the initial electrical parameter and the target electrical parameter;
first, calculate variance S:
secondly, calculating a calibration difference:
fourthly, calculating the standard deviation of the mean value:
fifthly, calculating uncertainty:
where K is a constant, K may be selected to be 2.
Thirdly, calculating the failure evaluation index of the measurement and control protection device according to the average value and the uncertainty; the calculation formula is as follows:
in the formula,
the average value of the current electrical parameter measurement results measured after each cycle;
is the average of the initial electrical parameter measurements; u shapelabThe measurement uncertainty of the measured electrical parameter after each cycle; u shaperefIs the measurement uncertainty of the initial electrical parameter measurement.
The evaluation method provided by the embodiment of the application can evaluate the accuracy of the measured current electrical parameters after each accelerated test, and can improve the failure evaluation accuracy of the measurement and control protection device compared with the prior art in which only simple comparison is carried out on result data before and after the test.
According to the failure evaluation method of the measurement and control protection device, after the initial electrical parameters of the measurement and control protection device to be tested and the current electrical parameters after an accelerated test are determined, the accuracy of the current electrical parameters of the measurement and control protection device measured after the accelerated test is judged, so that target electrical parameters meeting requirements are obtained, the current electrical parameters not meeting the requirements are eliminated, and random errors in data acquisition of the measurement and control protection device are considered; and finally, the failure evaluation of the measurement and control protection device is realized according to the initial electrical parameters and the target electrical parameters meeting the requirements. Therefore, the evaluation method can be used for judging the accuracy of the current electrical parameters measured after the experiment, and compared with the evaluation mode in the prior art, the failure evaluation accuracy of the measurement and control protection device is improved.
In order to facilitate the evaluation of the failure of the measurement and control protection device, on the basis of the above embodiment, as a preferred implementation, the evaluation of the failure of the measurement and control protection device according to the failure evaluation index specifically includes:
judging whether the invalidity evaluation index is smaller than a threshold value;
if so, representing that the measurement and control protection device does not fail;
if not, the characteristic measurement and control protection device fails.
Specifically, whether the calculated numerical value of the ineffectiveness index is smaller than a threshold value or not is judged, and when the calculated numerical value of the ineffectiveness index is smaller than the threshold value, the fact that the measurement and control protection device does not fail is determined, namely the measurement and control protection device does not have problems; and when the calculated numerical value of the failure index is larger than or equal to the threshold value, determining that the measurement and control protection device fails, namely that the measurement and control protection device has a problem. The threshold value may be set according to actual conditions, and the present invention is not limited thereto. In the embodiment of the present application, the threshold may be set to 1, that is, when | En | < l, the measurement and control protection device is considered not to be failed; and when the En is more than or equal to l, the measurement and control protection device is considered to be invalid.
In order to make those skilled in the art better understand the technical solutions in the present application, the following describes the technical solutions in the embodiments of the present application in detail with reference to practical application scenarios.
In the embodiment of the present application, the voltage is taken as an example for explanation, and the specific steps are as follows:
firstly, selecting a measurement and control protection device to be tested: specifically, before the test, in order to avoid error of the test result caused by self defects of a test sample (a measurement and control protection device to be tested), appearance inspection is carried out on a test sample assembly, and 1 measurement and control protection device with a good initial state is screened out.
Secondly, determining the initial electrical parameters: testing the voltage of a measurement and control protection device to be tested under standard test conditions according to a DL/T721-2013 standard before testing to obtain initial voltage data U (0,1), U (0,2) … … U (0, n), wherein the unit of the voltage is volt (V) on the assumption that the number of the tested voltage data is 9, namely n is 9; table 1 shows measured initial voltage data of the measurement and control protection device, as shown in table 1.
TABLE 1
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Initial voltage/V | 220.3 | 220.5 | 220.4 | 220.6 | 219.8 | 220.4 | 219.6 | 219.4 | 219.9 |
Thirdly, performing an accelerated test on the measurement and control protection device to be tested in a temperature/humidity/salt spray test environment: the method comprises the steps of carrying out an accelerated test in an accelerated test box by taking temperature, humidity and salt fog as accelerated stress according to the regulation in the standard GB/T2423.18, wherein salt solution is sprayed for 2 hours in each cycle, and then wet-heat storage is carried out for 20-22 hours; thereafter, a further storage period was carried out for a period of 3d under standard atmospheric conditions (temperature 23. + -. 2 ℃ C., relative humidity 45% -55%). The primary cycle time is 96h, after each cycle test is finished, the measurement and control protection device to be tested is taken out to be tested, the electrical parameters are tested under the standard test condition, and the current electrical parameter data voltages U (1,1), U (1,2) … … U (1, n) of the measurement and control protection device are obtained, wherein n is 9; table 2 voltage test data of the measurement and control protection device measured after each cycle of the test are shown in table 2.
TABLE 2
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| voltage/V after test | 220.6 | 220.2 | 219.7 | 220.3 | 220.2 | 220.4 | 220.5 | 219.8 | 219.6 |
And step four, processing the initial voltage and the voltage measured after the test: first, the voltage data in table 1 and table 2 are arranged by numbers to constitute a pair of results, and table 3 is a pair of voltage test results, as shown in table 3.
TABLE 3
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Initial voltage/V | 220.3 | 220.5 | 220.4 | 220.6 | 219.8 | 220.4 | 219.6 | 219.4 | 219.9 |
| voltage/V after test | 220.6 | 220.2 | 219.7 | 220.3 | 220.2 | 220.4 | 220.5 | 219.8 | 219.6 |
Next, the sum of the voltage data in each result pair in Table 3 is calculated divided by
The resulting values, i.e., the normalized sum S for each result pair was calculated, and table 4 is the data obtained for the normalized sum S of result pairs, as shown in table 4.
TABLE 4
Thirdly, according to the formula Z ═ S-xMThe Z ratio score calculation is performed on the result pair of table 4 by the Norm IQR, which is described above and will not be described herein, and the Z ratio score of the result pair normalization and S is shown in table 5.
TABLE 5
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Z ratio fraction | 1.36 | 1.02 | 0.00 | 1.36 | -0.17 | 1.19 | 0.00 | -1.50 | -1.00 |
In practical applications, evaluation criteria can be set: namely, when the absolute value of Z is less than or equal to 2, the result is satisfactory (meets the requirement); 2< | Z | <3 results have problems (do not meet requirements and can be deleted); and the result is unsatisfactory (available or unavailable, and has little influence on the whole evaluation result). As can be seen from Table 5, the voltage values measured after the acceleration test all meet the requirements.
Finally, the voltage data in tables 1 and 2 are used to evaluate the failure and reliability of the measurement and control protection device, specifically, the | En | method is used to evaluate the failure and reliability of the measurement and control protection device, the specific calculation process may refer to the calculation formula of the above failure evaluation index, which is not repeated here, and table 6 is a data calculation result, as shown in table 6.
TABLE 6
According to the failure evaluation index formula above:
can obtain | En | ═ 0.03, according to the evaluation criterion | En | luminance<When l, the measurement and control protection device is considered to be not invalid; and when the En is more than or equal to l, the measurement and control protection device is considered to be invalid.
From the data in table 6, it can be found that | En | ═ 0.03< l, and the measurement and control protection device is considered to be not failed. Therefore, the failure condition of the measurement and control protection device under the cyclic test level can be obtained, and the reliability of the measurement and control protection device under the cyclic test can be evaluated.
The embodiment of the failure evaluation method for the measurement and control protection device is described in detail above, and based on the failure evaluation method for the measurement and control protection device described in the above embodiment, the embodiment of the invention also provides a failure evaluation device for the measurement and control protection device corresponding to the method. Since the embodiment of the apparatus portion and the embodiment of the method portion correspond to each other, the embodiment of the apparatus portion is described with reference to the embodiment of the method portion, and is not described again here.
Fig. 2 is a schematic diagram of a failure evaluation device of a measurement and control protection device according to an embodiment of the present invention, and as shown in fig. 2, the device includes a determining module 201, an obtaining module 202, an accuracy detecting module 203, and an evaluating module 204.
The determining module 201 is used for determining initial electrical parameters of the measurement and control protection device to be tested;
the acquisition module 202 is used for acquiring the current electrical parameters of the measurement and control protection device after accelerated test in the accelerated test box;
the accuracy detection module 203 is used for detecting the accuracy of the current electrical parameter to obtain a target electrical parameter meeting the requirement;
and the evaluation module 204 is configured to evaluate the failure of the measurement and control protection device according to the initial electrical parameter and the target electrical parameter.
According to the failure evaluation device of the measurement and control protection device, after the initial electrical parameters of the measurement and control protection device to be tested and the current electrical parameters after an accelerated test are determined, the accuracy of the current electrical parameters of the measurement and control protection device measured after the accelerated test is judged, so that target electrical parameters meeting requirements are obtained, the current electrical parameters not meeting the requirements are eliminated, and random errors in data acquisition of the measurement and control protection device are considered; and finally, the failure evaluation of the measurement and control protection device is realized according to the initial electrical parameters and the target electrical parameters meeting the requirements. Therefore, the evaluation device can be used for judging the accuracy of the current electrical parameters measured after the experiment, and compared with the evaluation mode in the prior art, the failure evaluation accuracy of the measurement and control protection device is improved.
The embodiment of the failure evaluation method for the measurement and control protection device is described in detail above, and based on the failure evaluation method for the measurement and control protection device described in the above embodiment, the embodiment of the invention also provides a failure evaluation device for the measurement and control protection device corresponding to the method. Since the embodiment of the device part and the embodiment of the method part correspond to each other, the embodiment of the device part is described with reference to the embodiment of the method part, and is not described again here.
Fig. 3 is a schematic diagram illustrating a failure evaluation device of a measurement and control protection device according to an embodiment of the present invention, and as shown in fig. 3, the device includes a memory 301 and a processor 302.
A memory 301 for storing a calculation program;
the processor 302 is configured to execute a computer program to implement the steps of the failure evaluation method of the measurement and control protection device according to any of the above embodiments.
The failure evaluation equipment of the measurement and control protection device provided by the invention can judge the accuracy of the current electrical parameters measured after an experiment, and compared with the evaluation mode in the prior art, the failure evaluation accuracy of the measurement and control protection device is improved.
The embodiment of the failure evaluation method for the measurement and control protection device is described in detail above, and based on the failure evaluation method for the measurement and control protection device described in the above embodiment, the embodiment of the invention further provides a computer-readable storage medium corresponding to the method. Since the embodiment of the computer-readable storage medium portion and the embodiment of the method portion correspond to each other, please refer to the embodiment of the method portion for describing the embodiment of the computer-readable storage medium portion, which is not described herein again.
A computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the steps of a failure evaluation method for a measurement and control protection device provided in any one of the above embodiments.
According to the computer-readable storage medium provided by the invention, the processor can read the program stored in the readable storage medium, namely, the failure evaluation method of the measurement and control protection device provided by any one of the embodiments can be realized, the accuracy of the current electrical parameter measured after the experiment can be judged, and compared with the evaluation mode in the prior art, the failure evaluation accuracy of the measurement and control protection device is further improved.
The failure evaluation method, the failure evaluation device, the failure evaluation equipment and the failure evaluation storage medium of the measurement and control protection device provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using several examples, the above description of which is only intended to facilitate the understanding of the method and its core concepts of the present invention; meanwhile, for those skilled in the art, based on the idea of the present invention, there may be variations in the specific embodiments and applications, and in summary, the present disclosure should not be construed as a limitation of the present invention, and those skilled in the art should include modifications, equivalent substitutions, improvements and the like without inventive labor.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the term "comprises/comprising" and the like, such that a unit, device or system comprising a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such unit, device or system.
Claims (9)
1. A failure evaluation method for a measurement and control protection device is characterized by comprising the following steps:
determining initial electrical parameters of a measurement and control protection device to be tested;
acquiring current electrical parameters of the measurement and control protection device after accelerated test in an accelerated test box;
detecting the accuracy of the current electrical parameters to obtain target electrical parameters meeting requirements;
evaluating the failure of the measurement and control protection device according to the initial electrical parameters and the target electrical parameters;
wherein, the evaluating the failure of the measurement and control protection device according to the initial electrical parameter and the target electrical parameter specifically comprises:
calculating an average value and an uncertainty of the initial electrical parameter and the target electrical parameter, respectively;
calculating the failure evaluation index of the measurement and control protection device according to the average value and the uncertainty; wherein, calculating the failure evaluation index specifically comprises:
firstly, calculating the average value of the initial electrical parameter and the target electrical parameter, wherein the calculation formula is as follows:
wherein,
which represents the average value of the values,nthe number of the data is represented,
is shown asiA value of the electrical parameter;
secondly, calculating uncertainty of the initial electrical parameter and the target electrical parameter;
first, calculate variance S:
secondly, calculating a calibration difference:
fourthly, calculating the standard deviation of the mean value:
fifthly, calculating uncertainty:
whereinkis constant, choosek=2；
Thirdly, calculating the failure evaluation index of the measurement and control protection device according to the average value and the uncertainty; the calculation formula is as follows:
in the formula,
the average value of the current electrical parameter measurement results measured after each cycle;
is the average of the initial electrical parameter measurements;
the measurement uncertainty of the measured electrical parameter after each cycle;
a measurement uncertainty that is an initial electrical parameter measurement;
and evaluating the failure of the measurement and control protection device according to the failure evaluation index.
2. The failure evaluation method of the measurement and control protection device according to claim 1, wherein the determining of the initial electrical parameters of the measurement and control protection device to be tested specifically comprises:
the initial electrical parameters are determined according to the DL/T721-2013 standard.
3. The failure evaluation method of the measurement and control protection device according to claim 1, wherein the obtaining of the current electrical parameters of the measurement and control protection device after accelerated testing in an accelerated test box specifically comprises:
taking temperature, humidity and salt fog as the acceleration stress of the acceleration test box according to the GB/T2423.18 standard;
carrying out an acceleration test on the measurement and control protection device in the acceleration stress environment;
and acquiring the current electrical parameters of the measurement and control protection device after the accelerated test.
4. The failure evaluation method of the measurement and control protection device according to claim 1, wherein the detecting the accuracy of the current electrical parameter to obtain a target electrical parameter meeting the requirement specifically comprises:
and detecting the accuracy of the current electrical parameter in a mode of determining the discrete degree of the current electrical parameter to obtain the target electrical parameter.
5. The failure evaluation method of the measurement and control protection device according to claim 4, wherein the detecting the accuracy of the current electrical parameter by determining the degree of dispersion of the current electrical parameter specifically comprises:
and determining the discrete degree of the current electrical parameter by utilizing a robust Z-ratio score method so as to detect the accuracy of the current electrical parameter.
6. The failure evaluation method of the measurement and control protection device according to claim 1, wherein the evaluation of the failure of the measurement and control protection device according to the failure evaluation index specifically comprises:
judging whether the invalidity evaluation index is smaller than a threshold value;
if so, representing that the measurement and control protection device does not fail;
if not, the measurement and control protection device is represented to be invalid.
7. A failure evaluation device of a measurement and control protection device is characterized by comprising:
the determining module is used for determining initial electrical parameters of the measurement and control protection device to be tested;
the acquisition module is used for acquiring the current electrical parameters of the measurement and control protection device after accelerated test in the accelerated test box;
the accuracy detection module is used for detecting the accuracy of the current electrical parameter so as to obtain a target electrical parameter meeting the requirement;
the evaluation module is used for evaluating the failure of the measurement and control protection device according to the initial electrical parameters and the target electrical parameters;
wherein, the evaluating the failure of the measurement and control protection device according to the initial electrical parameter and the target electrical parameter specifically comprises:
calculating an average value and an uncertainty of the initial electrical parameter and the target electrical parameter, respectively;
calculating the failure evaluation index of the measurement and control protection device according to the average value and the uncertainty; wherein, calculating the failure evaluation index specifically comprises:
firstly, calculating the average value of the initial electrical parameter and the target electrical parameter, wherein the calculation formula is as follows:
wherein,
which represents the average value of the values,nthe number of the data is represented,
is shown asiA value of the electrical parameter;
secondly, calculating uncertainty of the initial electrical parameter and the target electrical parameter;
first, calculate variance S:
secondly, calculating a calibration difference:
fourthly, calculating the standard deviation of the mean value:
fifthly, calculating uncertainty:
whereinkis constant, choosek=2；
Thirdly, calculating the failure evaluation index of the measurement and control protection device according to the average value and the uncertainty; the calculation formula is as follows:
in the formula,
the average value of the current electrical parameter measurement results measured after each cycle;
is the average of the initial electrical parameter measurements;
the measurement uncertainty of the measured electrical parameter after each cycle;
a measurement uncertainty that is an initial electrical parameter measurement;
and evaluating the failure of the measurement and control protection device according to the failure evaluation index.
8. A failure evaluation device of a measurement and control protection device is characterized by comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the failure evaluation method of the observed and controlled protection device according to any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which is executed by a processor to implement the steps of the failure evaluation method of the measurement and control protection device according to any one of claims 1 to 6.
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