CN113156273B - Electrical strength test capability verification method and device - Google Patents
Electrical strength test capability verification method and device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—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
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Abstract
The invention discloses a method and a device for verifying the electric strength test capability, wherein the method comprises the following steps: and connecting the electric 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 to two ends of the capability verification device as an electric strength measured value of the capability verification device, and judging whether a measuring unit passes the capability verification according to the electric strength measured value. The invention relates to a capability verification method based on quantitative measurement of electrical strength, by which the deviation degree of a measurement value of the electrical strength of a measurement unit can be reflected, so that the electrical strength test capability of the measurement unit can be evaluated more accurately.
Description
Technical Field
The invention relates to the technical field of capability verification, in particular to an electrical strength test capability verification method and an electrical strength test capability verification device.
Background
The capability verification is an important measure for the external quality control of a laboratory, is also an important and effective measure for judging and monitoring the quality control level of the laboratory, is beneficial to promoting the capability construction of a qualified assessment organization, is one of main ways for evaluating the capability of the qualified assessment organization by CNAS (China national Committee for qualification), and is also a common way for maintaining the qualification of CNAS in the laboratory. Through the participation capability verification, whether laboratory testers, equipment, environments, methods and the like meet the standard requirements of the test can be comprehensively examined, and the participation laboratories can also know the detection capability of themselves and the overall detection level of the whole industry. Participants with unsatisfactory results can find problems from the problems, and take effective measures to carry out rectification so as to ensure the accuracy of daily detection results in the future.
The electrical strength test is also called a withstand voltage test and an withstand voltage test in some fields, is a necessary test item for electrical product safety test, generally requires a laboratory to apply an alternating voltage (the frequency is usually 50Hz or 60 Hz) with a certain value to a product through a withstand voltage tester according to an applicable insulation type, and judges whether the product meets the safety requirement according to whether an insulation breakdown phenomenon occurs in a specified time.
The capability verification process is similar to the electrical strength test process of the product, and a capability verification device, which is also commonly referred to as a capability verification standard sample, is applied with a prescribed alternating voltage, and then whether it passes the test or not is judged according to whether the result of breakdown of the device is consistent with a prescribed value or not. It can be seen that the existing capability verification makes only one qualitative determination. In the actual capability verification process, certain factors may occur, such as equipment operation errors, power frequency errors, equipment reading deviations and the like, which cause deviation of test results, and the traditional capability verification method is not beneficial to cause analysis. Meanwhile, the traditional capability verification device is a destructive sample, can be used once and cannot be reused, and the uniformity and stability of the sample can be tested only by sampling.
Disclosure of Invention
It is a first object of the present invention to provide a method of verifying the ability to quantitatively measure 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 electric 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 to two ends of the capability verification device as an electric strength measured value of the capability verification device, and judging whether a measuring unit passes the capability verification according to the electric strength measured value.
The method for verifying the capacity further comprises the step of obtaining the current value passing through the capacity verifying device under the specified voltage, wherein the step is mainly used for assisting in investigating whether the current value measured by the measuring unit is accurate or not, and further judging whether the measured electrical intensity value is inaccurate or not due to inaccurate current measurement or not.
The capability verification method further comprises the step of obtaining an image of the unit measurement test process.
The capability verification method further comprises the step of obtaining the latest verification data of the measuring unit electrical strength measuring device.
The capability verification method further includes the step of acquiring a frequency of a voltage applied across the capability verification device by a measurement unit.
In the scheme, the method for verifying the capability of quantitatively testing the electrical strength is provided, and meanwhile, the basis is provided for analyzing the reasons of the deviation of the measurement data 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 present invention is to propose a capability verification device for use in the above method.
The second invention aims at realizing the following technical scheme: the utility model provides a capability verification device, includes the casing, sets up first wiring end, the third wiring end on the casing, and seal 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 the capacitance resistance module more than two and forms, capacitance resistance module comprises 1 electric capacity and 1 electric resistance parallelly connected.
The verification circuit is formed by connecting N capacitance resistance modules in series, N is larger than or equal to 2, a second wiring terminal is further arranged on the shell, and the second wiring terminal and the third wiring terminal are respectively connected with two ends of the Nth capacitance resistance module.
The shell is also provided with a fourth wiring terminal, and the fourth wiring terminal and the capacitance resistance module are mutually independent.
Compared with the prior art, the invention has the following beneficial effects:
1) Compared with the prior art, the method only makes qualitative judgment, and the method is a capability verification method based on quantitative measurement of the electrical strength, and by the method, the deviation degree of the measurement value of the electrical strength of the measurement unit can be reflected, so that the electrical strength test capability of the measurement unit can be evaluated more accurately, and the measurement value of the electrical strength is obtained, compared with the qualitative judgment, so that the method is more beneficial to searching the reason of the deviation of the measurement result of the measurement unit;
2) The capability verification method also comprises the step of appointing voltage to measure 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 intensity value is inaccurate or not 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 relevant check data, the voltage frequency data and the like, the image data of the test process can assist in finding out the operation error of the equipment, the voltage frequency data can assist in finding out the power frequency setting error of the measurement unit, and the check data is favorable for detecting the deviation problem of the equipment reading of the measurement unit, so compared with the prior art, the method of the invention is more favorable for analyzing the reason of the deviation of the measurement data of the measurement unit;
4) By adopting the method, the capacity verification device can be repeatedly utilized, and the measurement unit, namely the capacity verification participant can be measured for a plurality of times so as to check, and the capacity verification mechanism can also enable the device to be repeatedly utilized by modifying breakdown current, voltage frequency appointed values and the like; and the method can perform uniformity and stability test 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 a 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 device of the present invention, in which r=510 kΩ, c=0.82 uF, and the number of capacitive resistive module groups n=5;
FIG. 3 is a circuit simulation diagram based on the circuit of FIG. 2, showing the effect of an analog withstand voltage tester when a voltage having an effective value of 1536V and a frequency of 50Hz is applied between the two terminals of A, B;
FIG. 4 is a circuit simulation diagram based on the circuit of FIG. 2, showing the effect of an analog withstand voltage tester when a voltage of 1536V and 60Hz is applied across A, B terminals.
Detailed Description
The invention provides an electrical strength test capability verification method based on quantitative measurement of electrical strength, and simultaneously recommends a capability verification device applicable to the method. Fig. 1 shows a schematic circuit diagram of a preferred embodiment of the proposed capability verification device of the present invention. The capability verification device includes a closed housing and an internal electronics board. Four terminals, respectively referred to as A, B, C, D, are provided on the housing (not shown) and their correspondence to the internal circuitry of the housing is indicated in fig. 1. The circuit in fig. 1 is arranged on said electronic circuit board. The front of the upper shell is also labeled with a1 label, and the label is labeled with a device name, a number and a capability verification mechanism LOGO. The circuit in fig. 1 is formed by connecting N groups of identical capacitive-resistive modules in series. N is a positive integer greater than 1 and typically takes a value between 5 and 10, but N is not meant to be 2 to 4 in other embodiments. Each group of capacitance-resistance modules consists of 1 capacitor and 1 resistor which are connected in parallel. The resistors are connected in parallel at the two ends of the capacitor, and after the power is cut off, the resistors can consume charges stored in the capacitor so as to prevent electric shock accidents when people touch the terminals by hands and improve the safety of the device. A. The connection relationship between B, D ends and the capacitive-resistive series module is shown in fig. 1. The C terminal is substantially separated from the N series capacitor resistor modules. The tester is mainly used for testing the electric intensity, usually a voltage-resistant tester, and is convenient for a capability verification participant to connect in series with an ammeter and other current metering devices at B, C ends or D, C ends under the condition that the tester does not have a current display function.
The voltage between the A, B terminals in FIG. 1 is related to the current flowingI.e., the current flowing between A, B terminals will increase linearly with increasing voltage and frequency between A, B terminals. A. The relation 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 device of the type in fig. 1. Without loss of generality, a withstand voltage tester will be directly employed to represent the means for electrical strength testing.
The electric strength test capability verification is generally completed by a capability verification mechanism and a capability verification participant, wherein 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 for carrying out an electric strength test according to the collected test data.
The invention is characterized in that the capability verification method is a capability verification method based on quantitative measurement of electric intensity, the method requires a capability verification participant to set a breakdown current set value of a voltage-resistant tester according to a standard, generally 100mA, set output voltage frequency, generally 50 or 60Hz, then raise the voltage between two terminals or A, C terminals of a capability verification device A, B (suitable for the condition that the matched voltage-resistant tester has no current display function and simultaneously requires 1 alternating current meter to be connected between two terminals of B, C) until the current flowing through the voltage-resistant tester reaches the breakdown current set value, and uses the applied voltage value as an electric intensity measured value of the capability verification device and reports the measured voltage value and the set voltage frequency according to the standard.
Another difference from the prior art is that the capability verification method of the present invention also requires the capability verification participant to raise the voltage between the two terminals of the capability verification device A, D or A, C (which is suitable for the case where the voltage withstand tester is equipped with no current display function, and also requires that 1 ac ammeter be connected in series between the two terminals of the device C, D) to a prescribed value at a prescribed frequency within a prescribed time, and report the measured current value and the specific set voltage frequency according to the standard. The step is mainly used for judging whether the current value measured by the capacity verification participant is accurate or not, and further assisting in judging whether the measured electrical intensity value is inaccurate or not due to inaccurate current measurement.
In the above step, the boosting time is usually set to 10s to 15s, and the test time (residence time after the parameter reaches the set value) is usually set to 10 to 15s.
In the above capability verification method, the capability verification device can be reused, and if the capability verification participant wants to test for multiple times, the capability verification participant only needs to wait for a few minutes, and the capability verification participant can test again after the device dissipates heat. Wherein, the electrical intensity value takes the minimum value in a plurality of tests. The capability verification mechanism may also enable the device to be reused by modifying breakdown current, voltage frequency designations, etc.
In the method, a circuit with incomplete consistency is adopted for voltage and current measurement, so that the phenomenon that a breakdown current set value in the previous step is directly used as a measurement result of the next step by a verification participant when the voltage measured value in the previous step is relatively close to a voltage set value in the next step is avoided, and the next step can play a practical value.
The invention relates to a method based on quantitative measurement of electrical intensity, by which the degree of deviation of the electrical intensity measurement value of a participant can be verified by the reaction capacity, so that the electrical intensity test capacity of the participant can be evaluated more accurately.
In the above step, the frequency data of the capability verification participant is collected for checking whether there is a problem of power frequency error. In addition to the above, the method of the present invention requires the ability to verify that the participants provide the image data of the test procedure and the latest calibration certificate of the pressure resistance tester. The image data of the test process can assist in finding out the operation errors of the equipment, and the check data is beneficial to detecting the deviation problem of the equipment readings of the measuring units. Therefore, compared with the prior art, the method is beneficial to analyzing the reasons of the deviation of the measurement data of the measurement unit.
The invention is further analyzed in the following three ways of calculation of the theoretical value of the electric intensity, computer simulation and actual test.
1. Calculation of theoretical value of electrical intensity
The theoretical calculation of the electrical strength is performed for the capacity verification device numbered CVC2019S01, the schematic circuit diagram of which is shown in fig. 2, where r=510 kΩ, c=0.82 uF, n=5.
The electrical intensity theoretical value calculation is carried out on the circuit diagram of fig. 2, the breakdown current set value I is set to 100mA, f is 50Hz, and the voltage theoretical value U between A and B is obtained by the following formula:
i.e. the theoretical electrical strength value of the CVC2019S01 capability verification device is 1550V.
When the I value and the f value are changed, the corresponding U value can be obtained through the above formula.
2. Circuit simulation
The circuit of fig. 2 was simulated on a computer, and as shown in fig. 3, when a voltage with an effective value of 1536V and a frequency of 50Hz was applied between the two terminals of A, B, a breakdown current set value of 100mA was reached, i.e., the electrical intensity value obtained by computer simulation was 1536V.
In the CVC2019S01, the specified value of the electrical intensity is 1555V, the electrical intensity value is a satisfactory result within the range of 1555v±40V, and the above-mentioned computer simulation result is 1536V close to and within the 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 that the wrong use of the power supply frequency resulted in a wrong test result, when a voltage with an effective value of 1536V and a frequency of 60Hz was applied between the two terminals of A, B, the breakdown current value reached 121mA, which is 1.2 times that of 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 measured value of the electrical intensity deviates, whether the deviation is caused by the setting error of the power supply frequency or not can be analyzed according to the linear relation between the current and the voltage frequency.
The circuit simulation in fig. 4 also illustrates that misuse 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 test
Because the method is a capability verification method based on quantitative measurement of the electrical strength, the method does not pursue the actual breakdown current of the capability verification device, but only sets a current value which is obviously smaller than the actual breakdown current as a threshold value, and determines the electrical strength value corresponding to the threshold value. Therefore, the method of the invention has no destructiveness to the capability verification device, and can carry out uniformity and stability test on all devices so as to better ensure the quality of the devices.
The ability verification device was subjected to uniformity testing, 80 total, and was subjected to full inspection, 2 repeated tests each. The uniformity of the minimum breakdown voltage (the smaller of the two voltage measurements corresponding to the breakdown current set point) of the device was checked using a single factor anova (F-test).
The electrical strength uniformity test and assessment data of the capability verification device are shown in table 1:
table 1 electrical strength uniformity assessment data
The electrical strength uniformity analysis results are shown in Table 2
TABLE 2 electrical strength uniformity analysis results
Since 1.42< threshold F 0.05(79,80) =1.45, the calculated fstator was less than the fstator, indicating that at a level of significance of 0.05, the ability to verify that the sample electrical intensity analysis results were uniform. The average value of the electric intensity tests obtained by the uniformity tests of the 80 capability verification devices is 1557V, which is very close to the theoretical value 1550V, and the capability verification device is proved to be applicable.
Application of the invention to laboratory submitted calibration certificates:
From laboratory data for which the results in the CVC2019S01 electrical strength test capability verification program are unsatisfactory, for example, a laboratory with a laboratory code of CVC2019S01-002, the breakdown alarm current set value is 100mA, but the calibration certificate is 97.52mA, which is presumed to be the cause of the lower minimum breakdown voltage of the laboratory; the laboratory code CVC2019S01-016, the breakdown alarm current set value is 100mA, but the calibration certificate is 101.7mA, which is presumed to be the reason why the laboratory electrical strength test result is high. The calibration certificate may provide a basis for deviations in laboratory test results.
Application of the invention to laboratory submitted current measurements:
If the voltage applied across the terminals of the capability verification device A, D or A, C is set to 1500V, the corresponding theoretical current value is (1550 In the formula is a theoretical value of electric intensity, 5 is a value of N, 4 is a value of N-1, and 100 is a current value specified in the electric intensity test). The laboratory code is CVC2019S01-020, the submitted current result is 91.0mA, the electric intensity result submitted by the laboratory is 1305V, the voltage withstand tester of the laboratory can be presumed to have lower voltage display result or higher current display result, the laboratory needs to further check the accuracy of the voltage withstand tester, and the measurement accuracy of the voltage withstand tester is checked if necessary. Through subsequent tests, under the condition that the laboratory is connected with the high-precision ammeter at the C, D terminal, the laboratory test result is close to the appointed value, and the deviation of the laboratory result can be determined because of the inaccuracy of the current display value of the withstand voltage tester equipment.
Claims (8)
1. The method for verifying the electrical strength test capability is characterized by comprising the following steps of: and connecting the electric 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 to two ends of the capability verification device as an electric strength measured value of the capability verification device, and judging whether a measuring unit passes the capability verification according to the electric strength measured value.
2. The electrical strength test capability verification method according to claim 1, further comprising the step of obtaining a current value passing through the capability verification device at a specified voltage, and wherein the voltage and current measurements employ a circuit that is not entirely uniform.
3. The electrical strength test capability verification method according to claim 1, further comprising the step of obtaining a measurement unit test process image.
4. The electrical strength test capability verification method according to claim 1, further comprising the step of acquiring latest verification data of the measurement unit electrical strength measurement device.
5. The electrical strength test capability verification method according to claim 1, further comprising the step of acquiring a frequency of a voltage applied across the capability verification device in units 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, a third terminal, and a verification circuit sealed in the housing, wherein two ends of the verification circuit are respectively connected with the first terminal and the third terminal, and the capability verification device is characterized in that the verification circuit is composed of one capacitor resistor module or more than two capacitor resistor modules connected in series, and the capacitor resistor module is composed of 1 capacitor and 1 resistor connected in parallel.
7. The capacity verification device as claimed in claim 6, wherein the verification circuit is formed by connecting N capacitive resistive modules in series, N is equal to or greater than 2, and the housing is further provided with a second terminal, and the second terminal and the third terminal are respectively connected to two ends of the nth capacitive resistive 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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| 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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| 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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