CN113156273A - Method and device for verifying electrical strength test capability - Google Patents
Method and device for verifying electrical strength test capability Download PDFInfo
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- CN113156273A CN113156273A CN202110003338.2A CN202110003338A CN113156273A CN 113156273 A CN113156273 A CN 113156273A CN 202110003338 A CN202110003338 A CN 202110003338A CN 113156273 A CN113156273 A CN 113156273A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Abstract
The invention discloses a method and a device for verifying electrical strength test capability, wherein the method comprises the following steps: and connecting the electrical strength testing device with the capability verification device, increasing the voltage at two ends of the capability verification device within a specified time until the current flowing through the capability verification device reaches a breakdown current set value, taking the voltage applied at two ends of the capability verification device as an electrical strength measured value of the capability verification device, and judging whether the measurement unit passes the capability verification or not according to the electrical strength measured value. The invention relates to a capability verification method based on quantitative measurement of electrical strength, which can reflect the deviation degree of the electrical strength measurement value of a measurement unit, thereby more accurately evaluating the electrical strength test capability of the measurement unit.
Description
Technical Field
The invention relates to the technical field of capability verification, in particular to a method and a device for verifying electrical strength test capability.
Background
The capability verification is an important measure for the external quality control of the laboratory, is an important and effective means for judging and monitoring the quality control level of the laboratory, is beneficial to promoting the capability construction of a qualification mechanism, is one of the main ways for CNAS (China national committee for qualification) to evaluate the capability of the qualification mechanism, and is also a common way for the laboratory to maintain the CNAS qualification. Through the verification of the participation capacity, whether laboratory testing personnel, equipment, environment, methods and the like meet the standard requirements of the test can be comprehensively inspected, and the participation laboratory can know the self detection capacity and the overall detection level of the whole industry. Participants with unsatisfactory results can find problems from the data and take effective measures to correct and improve the data so as to ensure the accuracy of daily detection results in the future.
The electrical strength test is a necessary test item for the safety test of electrical products, and usually requires a laboratory to apply an alternating current voltage (frequency is usually 50Hz or 60Hz) with a certain value to the products through a voltage tester according to the applicable insulation types, and judge whether the products meet the safety requirements according to whether insulation breakdown occurs within a specified time.
The capability verification process is similar to the electrical strength test process of a product, and a capability verification device, which is also commonly called a capability verification standard sample, is applied with a specified alternating voltage and then is judged to pass or not to pass the test according to whether the breakdown result is consistent with the specified value or not. It can be seen that existing capability verification makes only one qualitative determination. In the actual capacity verification process, certain factors, such as equipment operation errors, power supply frequency errors, equipment reading deviation and the like, may occur to cause deviation of test results, and the traditional capacity verification method is not favorable for cause analysis. Meanwhile, the traditional capacity verification device is a destructive sample, can be used only once and cannot be reused, and the uniformity and stability of the sample can be only checked in a sampling mode.
Disclosure of Invention
A first object of the present invention is to provide a method for verifying the capability of quantitatively measuring electrical strength.
The first invention is realized by the following technical scheme: the method for verifying the electrical strength test capability is characterized by comprising the following steps of: and connecting the electrical strength testing device with the capability verification device, increasing the voltage at two ends of the capability verification device within a specified time until the current flowing through the capability verification device reaches a breakdown current set value, taking the voltage applied at two ends of the capability verification device as an electrical strength measured value of the capability verification device, and judging whether the measurement unit passes the capability verification or not according to the electrical strength measured value.
The capability verification method also comprises a step of obtaining a current value passing through the capability verification device under the specified voltage, wherein the step is mainly used for assisting in investigating whether the current value measured by a measuring unit is accurate or not and further judging whether the measured electrical strength value is inaccurate due to inaccurate current measurement or not.
The capability verification method further includes the step of obtaining a measurement unit test procedure image.
The capacity verification method further comprises the step of acquiring latest verification data of the electric intensity measuring device of the measuring unit.
The capability verification method further includes a step of acquiring a frequency at which a unit of measurement is applied to the voltage across the capability verification device.
In the scheme, the capability verification method for quantitatively testing the electrical strength is provided, and meanwhile, a basis is provided for analyzing the reason of the measurement data deviation of the measurement unit by supplementing the image data, the related verification data, the voltage frequency data and the like in the test process.
A second object of the invention is to propose a capability verification device for the above method.
The second invention purpose of the invention is realized by the following technical scheme: the utility model provides a capability verification device, includes the casing, sets up first wiring end, third wiring end on the casing, and seals up verification circuit in the casing, verification circuit's both ends respectively with first, third wiring end link to each other, its characterized in that, verification circuit comprises a capacitance resistance module or is established ties by more than two capacitance resistance modules and forms, capacitance resistance module comprises 1 electric capacity and 1 resistance parallelly connected.
The verification circuit is formed by connecting N capacitor resistance modules in series, N is not less than 2, still be equipped with the second wiring end on the casing, second wiring end and third wiring end are continuous with the both ends of N capacitor resistance module respectively.
And a fourth wiring terminal is further arranged on the shell, and the fourth wiring terminal and the capacitance and resistance module are arranged independently.
Compared with the prior art, the invention has the following beneficial effects:
1) compared with the prior art which only carries out qualitative judgment, the invention is a capability verification method based on the quantitative measurement of the electrical strength, and the method can reflect the deviation degree of the electrical strength measurement value of a measurement unit, thereby more accurately evaluating the electrical strength test capability of the measurement unit, and being more beneficial to searching the cause of the deviation of the measurement result of the measurement unit compared with the qualitative judgment of the obtained electrical strength measurement value;
2) the capacity verification method also comprises a step of specifying voltage and current, wherein the step is mainly used for assisting in investigating whether the current value measured by a measuring unit is accurate or not and further judging whether the measured electrical strength value is inaccurate due to inaccurate current measurement or not;
3) the method of the invention simultaneously requires the measurement unit to provide the image data of the test process, the related check data, the voltage frequency data and the like, the image data of the test process can assist in finding the operation error of the equipment, the voltage frequency data can assist in finding the power frequency setting error of the measurement unit, and the check data is beneficial to perceiving the reading deviation problem of the equipment of the measurement unit, so compared with the prior art, the method of the invention is more beneficial to analyzing the reason of the measurement data deviation of the measurement unit;
4) by adopting the method, the capability verification device can be repeatedly used, the measurement unit, namely the capability verification participant can carry out multiple measurements so as to be checked, and the capability verification mechanism can also repeatedly use the device by modifying the breakdown current, the voltage frequency specified value and the like; and the method can carry out uniformity and stability inspection on all devices so as to better ensure the quality of the devices.
Drawings
FIG. 1 is an electrical schematic diagram of a preferred embodiment of the capability verification device of the present invention, wherein R is a resistor, C is a capacitor, and N is a positive integer greater than 1;
fig. 2 is a schematic circuit diagram of a preferred embodiment of the capability verification apparatus of the present invention, where R is 510k Ω, C is 0.82uF, and the number N of capacitor-resistor modules is 5;
FIG. 3 is a circuit simulation diagram based on the circuit of FIG. 2, which simulates the effect of the withstand voltage tester when a voltage with an effective value of 1536V and a frequency of 50Hz is applied between the two terminals A, B;
fig. 4 is a circuit simulation diagram based on the circuit of fig. 2, which simulates the effect of the withstand voltage tester when a voltage with an effective value of 1536V and a frequency of 60Hz is applied between the two terminals of A, B.
Detailed Description
The invention provides an electric intensity test capability verification method based on electric intensity quantitative measurement, and also provides a capability verification device applicable to the method. Fig. 1 shows a schematic circuit diagram of a preferred embodiment of the capability verification device according to the present invention. The capability verification device includes an enclosed housing and an internal electronics board. The housing (not shown) is provided with four terminals, each designated A, B, C, D, which correspond to the circuitry within the housing as indicated in fig. 1. The circuit in fig. 1 is arranged on the electronic circuit board. The front of the upper shell is also pasted with a label 1, and the label is marked with a device name, a serial number and a LOGO of a capability verification mechanism. The circuit in fig. 1 is formed by connecting N groups of same capacitance-resistance modules in series. N is a positive integer greater than 1, and typically ranges from 5 to 10, although N is not necessarily 2 to 4 in other embodiments. Each group of capacitance and resistance module is formed by connecting 1 capacitor and 1 resistor in parallel. The resistors are connected in parallel at the two ends of the capacitor, and after power failure, the resistors can consume charges stored in the capacitor, so that electric shock accidents can be prevented when a human hand touches the wiring terminal, and the safety of the device is improved. A. B, D and the capacitor-resistor series module are connected as shown in FIG. 1. The terminal C is substantially separated from the N groups of capacitance and resistance modules which are connected in series. The tester is mainly used for facilitating a capability verification participant to serially connect current metering devices such as an ammeter and the like between an B, C end or a D, C end under the condition that an electrical strength testing device, usually a withstand voltage tester, does not have a current display function.
A, B in FIG. 1, the relationship between the voltage across the terminals and the current flowing through the terminals is
That is, the current flowing between terminals A, B will increase linearly with increasing voltage and frequency between terminals A, B. A. The relationship between the current and the voltage of the D terminal can be analogized.
The capability verification method of the present invention will be described in detail below in connection with a capability verification apparatus of the type shown in fig. 1. Without loss of generality, the voltage withstanding tester is directly adopted to represent the device for testing the electrical strength.
The electric strength test capability verification is generally completed by a capability verification mechanism and a capability verification participant together, the capability verification mechanism provides a capability verification device, the capability verification participant operates the capability verification device according to the above standard and returns test data, and the capability verification mechanism evaluates the capability of the capability verification participant to carry out an electric strength test according to the collected test data.
The capability verification method is mainly characterized in that the capability verification method is based on quantitative measurement of electrical strength, and requires a capability verification participant to set a breakdown current set value of a voltage tester according to a standard, generally 100mA, set an output voltage frequency, generally 50 or 60Hz, then raise the voltage between two terminals of a capability verification device A, B or between two terminals of A, C (suitable for the situation that the matched voltage tester has no current display function, and simultaneously requires that 1 alternating current meter is connected in series between the two terminals of B, C) within a specified time until the current flowing through the voltage tester reaches the breakdown current set value, use the applied voltage value as the electrical strength measured value of the capability verification device, and report the measured voltage value and the set voltage frequency according to the standard.
The capability verification method is further different from the prior art in that the capability verification participant is required to raise the voltage between two terminals A, D or between two terminals A, C (which is suitable for the situation that the matched withstand voltage tester has no current display function and requires that 1 alternating current meter is connected in series between two terminals C, D) of the capability verification device to a specified value within a specified time at a specified frequency, and the measured current value and the specifically set voltage frequency are reported according to the standard. The step is mainly used for judging whether the current value measured by the participant is accurate or not in the capability verification so as to assist in judging whether the measured electrical strength value is inaccurate due to inaccurate current measurement or not.
In the above step, the pressure-raising time is usually set to 10-15s, and the test time (residence time after the parameter reaches the set value) is usually set to 10-15 s.
In the above capability verification method, the capability verification device can be repeatedly used, and if a participant of capability verification wants to test for many times, the participant of capability verification only needs a few minutes, and can test again after the device dissipates heat. And the electrical strength value is the minimum value in multiple tests. The capability verification mechanism can also enable the device to be recycled by modifying the breakdown current, the voltage frequency specified value and the like.
In the method, the voltage and current measurement adopts a circuit which is not completely consistent, so that the phenomenon that a participant directly takes the breakdown current set value in the previous step as the measurement result in the next step when the voltage measurement value in the previous step is closer to the voltage specified value in the next step is avoided, and the actual value of the next step can be played.
The method can verify the deviation degree of the electric intensity measured value of the participant in response to the capability, thereby more accurately evaluating the electric intensity test capability of the participant.
In the above step, the frequency data of the capability verification participants is collected for checking whether there is a problem of power supply frequency error. In addition to the above, the method of the present invention requires the capability verification participants to provide the test procedure image data and the latest calibration certificate for the pressure tester. The image data in the test process can assist in finding out equipment operation errors, and the verification data is beneficial to perceiving the problem of equipment reading deviation of a measurement unit. Therefore, compared with the prior art, the method is beneficial to analyzing the reason of the measurement data deviation of the measurement unit.
The invention is further analyzed in three modes of theoretical value calculation of electric intensity, computer simulation and actual test.
1. Calculation of theoretical value of electric strength
The theoretical value of the electrical strength is calculated for the capacity verification device with the number of CVC2019S01, and the schematic circuit diagram of the capacity verification device in this batch is shown in fig. 2, where R is 510k Ω, C is 0.82uF, and N is 5.
The theoretical value of the electric intensity is calculated for the circuit diagram of fig. 2, the breakdown current set value I is set to 100mA, f is 50Hz, and the theoretical value of the voltage U between terminals A, B is obtained by the following formula:
namely, the theoretical value of the electrical strength of the CVC2019S01 capacity verification device is 1550V.
When the value I and the value f are changed, the corresponding U value can be obtained through the formula.
2. Circuit simulation
The circuit of fig. 2 was simulated on a computer, and as shown in fig. 3, when a voltage having an effective value of 1536V and a frequency of 50Hz was applied between the two terminals A, B, the breakdown current set value was 100mA, that is, the electrical strength value obtained by the computer simulation was 1536V.
In the CVC2019S01, the specified value of the electrical strength is 1555V, the electrical strength value is satisfactory within a 1555V +/-40V range, and the computer simulation result is 1536V which is close to and within a satisfactory result range of the specified value 1555V of the CVC2019S 01.
When the circuit of fig. 2 was simulated on a computer as shown in fig. 4 to simulate the wrong use of the power supply frequency resulting in a wrong test result, a voltage with an effective value of 1536V and a frequency of 60Hz was applied between the two terminals A, B, the breakdown current reached 121mA, which was 1.2 times the 100 mA. I.e. when the frequency is increased by a factor of 1.2, the current is also increased by a factor of 1.2. When the electric intensity measured value deviates, whether the deviation is caused by the power supply frequency setting error can be analyzed according to the linear relation between the current and the voltage frequency.
The circuit simulation in fig. 4 also illustrates that the wrong use of the power supply frequency does have an effect on the test results. An increase in the power supply frequency will increase the breakdown current.
3. Actual testing
The method is a capability verification method based on quantitative measurement of electrical strength, and the method does not pursue the real breakdown current of a capability verification device, but sets a current value which is obviously smaller than the real breakdown current as a threshold value and determines an electrical strength value corresponding to the threshold value. Therefore, the method of the invention has no destructiveness to the capacity verification device, and can carry out uniformity and stability inspection on all devices so as to better ensure the quality of the devices.
The capacity verification device was tested for uniformity, 80 in total, and was tested for total inspection, 2 times for each repetition. The uniformity of the minimum breakdown voltage (the smaller of the two measurements of voltage corresponding to the breakdown current setpoint) of the device was checked using a one-factor analysis of variance method (F-test).
The electrical strength uniformity test evaluation data of the capacity verification device is shown in table 1:
table 1 electrical strength uniformity assessment data
The results of the electrical strength uniformity analysis are shown in Table 2
TABLE 2 results of electrical strength uniformity analysis
Due to 1.42<Critical value F0.05(79,80)The calculated F statistic was less than the F cutoff at 1.45, indicating that at 0.05 significance level, the power validation sample electrical strength analysis results were uniform. The average value of the electrical strength tests obtained by the uniformity tests of the 80 capacity verification devices is 1557V, which is very close to the theoretical value of 1550V, and the capacity verification device is proved to be applicable.
The invention is applied to the calibration certificate submitted by a laboratory:
from the laboratory data that the result in the CVC2019S01 electrical strength test capability verification plan is unsatisfactory, for example, the laboratory with the laboratory code CVC2019S01-002 has a breakdown alarm current set value of 100mA, but the calibration certificate of 97.52mA, which is presumed to be the reason that the minimum breakdown voltage of the laboratory is lower; the laboratory with the laboratory code CVC2019S01-016 has a breakdown alarm current setting value of 100mA, but a calibration certificate of 101.7mA, which is presumed to be the reason for the higher electrical strength test result of the laboratory. The calibration certificate may provide a basis for the deviation of the laboratory test results.
The invention is applied to the current measurement value submitted by a laboratory:
if the specified value of the voltage applied between the two terminals of the capability verification device A, D or between the two terminals of A, C is 1500V, the corresponding experimental theoretical current value is 1500V
(1550 in the formula is the theoretical value of the electrical strength, 5 is the value of N, 4 is the value of N-1, and 100 is the current value specified in the electrical strength test). Checking that the laboratory code is CVC2019S01-020, the submitted current result is 91.0mA, the submitted electrical strength result is 1305V, and the laboratory can conjecture that the withstand voltage tester of the laboratory has low voltage display result or high current display result, the laboratory needs to further check the accuracy of the withstand voltage tester, and if necessary, the metering accuracy of the withstand voltage tester is checked. Through subsequent tests, under the condition that the C, D terminal of the laboratory is connected with the high-precision ammeter, the laboratory test result is close to the specified value, the cause of laboratory result deviation can be determined to be caused by inaccuracy of the current display value of the withstand voltage tester equipment, and guidance can be provided for the laboratory test result deviation.
Claims (8)
1. The method for verifying the electrical strength test capability is characterized by comprising the following steps of: and connecting the electrical strength testing device with the capability verification device, increasing the voltage at two ends of the capability verification device within a specified time until the current flowing through the capability verification device reaches a breakdown current set value, taking the voltage applied at two ends of the capability verification device as an electrical strength measured value of the capability verification device, and judging whether the measurement unit passes the capability verification or not according to the electrical strength measured value.
2. The electrical strength test capability verification method according to claim 1, further comprising a step of obtaining a value of a current passing through the capability verification device at a specified voltage.
3. The electrical strength test capability verification method of claim 1, further comprising the step of obtaining a measurement unit test procedure image.
4. The electrical strength test capability verification method according to claim 1, further comprising a step of obtaining latest verification data of the unit of measurement electrical strength measuring device.
5. The electrical strength test capability verification method of claim 1, further comprising the step of obtaining a frequency of a voltage applied across the capability verification device by a unit of measurement.
6. A capability verification device for use in the method of any one of claims 1 to 5, comprising a housing, a first terminal and a third terminal disposed on the housing, and a verification circuit sealed in the housing, wherein both ends of the verification circuit are connected to the first and third terminals, respectively, wherein the verification circuit is formed by one or more capacitance-resistance modules, and the capacitance-resistance module is formed by connecting 1 capacitance in parallel with 1 resistance.
7. The capability verification apparatus according to claim 6, wherein the verification circuit is formed by connecting N capacitance-resistance modules in series, N ≧ 2, and the housing further has a second terminal, and the second terminal and the third terminal are respectively connected to two ends of the nth capacitance-resistance module.
8. The capability verification device of claim 7, wherein a fourth terminal is further provided on the housing, the fourth terminal being independent of the capacitive-resistive module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110003338.2A CN113156273B (en) | 2021-01-04 | Electrical strength test capability verification method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110003338.2A CN113156273B (en) | 2021-01-04 | Electrical strength test capability verification method and device |
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| CN113156273A true CN113156273A (en) | 2021-07-23 |
| CN113156273B CN113156273B (en) | 2024-04-26 |
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| CN110007202A (en) * | 2019-04-24 | 2019-07-12 | 中国家用电器研究院 | A kind of proficiency testing and its sample preparation methods of electrical strength test |
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