CN114464497A - Vacuum degree comparison detection method and system for vacuum arc-extinguishing chamber - Google Patents
Vacuum degree comparison detection method and system for vacuum arc-extinguishing chamber Download PDFInfo
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- CN114464497A CN114464497A CN202210088328.8A CN202210088328A CN114464497A CN 114464497 A CN114464497 A CN 114464497A CN 202210088328 A CN202210088328 A CN 202210088328A CN 114464497 A CN114464497 A CN 114464497A
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- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 31
- 238000012797 qualification Methods 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 2
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- 238000004364 calculation method Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 2
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- 230000032683 aging Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/668—Means for obtaining or monitoring the vacuum
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Abstract
The invention relates to a vacuum degree comparison detection method and a vacuum degree comparison detection system for a vacuum arc extinguish chamber, wherein the method comprises the following steps: after the vacuum arc-extinguishing chamber is kept still for a first time period T1, measuring the first vacuum degree to obtain a first vacuum degree P1; after the vacuum arc-extinguishing chamber is kept still for a second time T2, measuring the second vacuum degree to obtain a second vacuum degree P2; judging whether the first vacuum degree P1 and the second vacuum degree P2 meet preset conditions or not; if so, judging whether the second vacuum degree P2 meets the current vacuum degree value required to be met in the preset storage period according to a preset analysis algorithm, and judging whether the vacuum arc-extinguishing chamber is qualified. The scheme is used for solving the technical problem that the qualification prejudgment accuracy of the vacuum degree test on the 20-year storage period is not high in the prior art, the gas pressure change trend in the vacuum arc-extinguishing chamber is measured and calculated by adopting a vacuum degree comparison method, and products with qualified vacuum degree and abnormal vacuum degree change trend can be screened out in advance.
Description
Technical Field
The disclosure relates to the field of quality detection, in particular to a vacuum degree comparison detection method and system for a vacuum arc extinguish chamber.
Background
In the vacuum arc-extinguishing chamber for the industrial standard JB/T8738-2008 high-voltage alternating-current switchgear, the internal gas pressure of the vacuum arc-extinguishing chamber when leaving the factory is lower than 1.33 multiplied by 10-3Pa, the allowable storage period of the vacuum arc-extinguishing chamber is 20 years, and the internal gas pressure of the vacuum arc-extinguishing chamber is lower than 6.6 multiplied by 10 in the allowable storage period-2Pa。
The prior technical proposal is that the vacuum arc-extinguishing chamber is aged and measured once after being dischargedMeasuring the vacuum degree again before shipping, wherein the vacuum degree is lower than 1.33 × 10-3And Pa is judged to be qualified.
The requirement of 20-year storage period is judged according to the fact that the two vacuum degree measurement values are less than 1.33 multiplied by 10 < -3 > Pa (namely, the vacuum degree measurement values are less than 6.6 multiplied by 10 < -2 > Pa in 20 years), and the accuracy of qualification prediction of the 20-year storage period is not high in the vacuum degree test.
Disclosure of Invention
The invention aims to provide a vacuum degree comparison detection method and system for a vacuum arc-extinguishing chamber, which are used for solving the technical problem that the qualification prejudgment accuracy of a vacuum degree test on a 20-year storage period is not high in the prior art.
In order to achieve the above object, a first aspect of the present disclosure provides a vacuum degree comparison detection method for a vacuum interrupter, including:
after the vacuum arc-extinguishing chamber is kept still for a first time period T1, measuring the first vacuum degree to obtain a first vacuum degree P1;
after the vacuum arc-extinguishing chamber is kept still for a second time T2, measuring the second vacuum degree to obtain a second vacuum degree P2;
judging whether the first vacuum degree P1 and the second vacuum degree P2 meet preset conditions or not;
if so, judging whether the second vacuum degree P2 meets the current vacuum degree value required to be met in the preset storage period according to a preset analysis algorithm, and judging whether the vacuum arc-extinguishing chamber is qualified.
Optionally, the preset analysis algorithm is as follows:
p2- (0.066-P1) N/7300-P1 < 0; wherein N represents actual number of days between measuring the first vacuum level P1 and measuring the second vacuum level P2;
if the result is less than 0, determining that the second vacuum degree P2 meets the current vacuum degree value required to be met by the preset storage period; if the result is 0 or more, it is not satisfied.
Optionally, determining whether the first vacuum degree P1 and the second vacuum degree P2 satisfy a preset condition includes:
determining whether the second vacuum level P2 differs from the first vacuum level P1 by an order of magnitude less than or equal to 1 order of magnitude; and
judging whether the second vacuum degree P2 is smaller than a preset standard value;
if the judgment result is yes, judging that the first vacuum degree P1 and the second vacuum degree P2 meet the preset condition; and if at least one judgment result is negative, judging that the first vacuum degree P1 and the second vacuum degree P2 do not meet the preset condition.
Optionally, after determining that the first vacuum degree P1 and the second vacuum degree P2 do not satisfy the preset condition, the method further comprises:
if the magnitude difference between the second vacuum degree P2 and the first vacuum degree P1 is more than 1 magnitude, after the vacuum arc-extinguishing chamber stands for a third time T3, measuring the third vacuum degree to obtain a third vacuum degree P3;
if the difference between the third vacuum degree P3 and the second vacuum degree P2 is in the same order of magnitude, judging according to the third vacuum degree P3, the second vacuum degree P2 and the preset analysis algorithm; if the difference between the third vacuum degree P3 and the first vacuum degree P1 is in the same order of magnitude, the judgment is carried out according to the third vacuum degree P3, the first vacuum degree P1 and the preset analysis algorithm.
Optionally, the first time period T1 is greater than 72 hours; the second period of time T2 is > 72 hours.
Optionally, the environmental humidity of the detection environment where the vacuum arc-extinguishing chamber is located is less than 60%, and the vacuum arc-extinguishing chamber is stored in the detection environment for more than 24 hours in advance.
Optionally, the same vacuum gauge is used for each measurement to make the vacuum measurement.
The second aspect of the disclosure provides a vacuum comparison and detection system for a vacuum arc-extinguishing chamber, which comprises a timing module, a vacuum measurement module and a quality judgment module;
the timing module is configured to judge whether the standing time of the vacuum arc-extinguishing chamber reaches a first time length T1 and a second time length T2 respectively;
the vacuum degree measuring module is configured to measure a first vacuum degree when the standing time length reaches the first time length T1, and a first vacuum degree P1 is obtained; measuring a second vacuum degree when the standing time reaches the second time T2 to obtain a second vacuum degree P2;
the quality determination module is configured to determine whether the first vacuum level P1 and the second vacuum level P2 satisfy a preset condition; if so, judging whether the second vacuum degree P2 meets the current vacuum degree value required to be met in the preset storage period according to a preset analysis algorithm, and judging whether the vacuum arc-extinguishing chamber is qualified.
Optionally, the system includes a condition determining module configured to determine whether an ambient humidity of a detection environment where the vacuum interrupter is located is less than 60%; and judging whether the same vacuum gauge is used for vacuum degree measurement in each measurement.
Optionally, the vacuum measurement module comprises a pulse magnetic control vacuum gauge or a Bayard-Alpert gauge.
According to the technical scheme, after the vacuum arc-extinguishing chamber is discharged and aged at high pressure, the change trend of the gas pressure in the vacuum arc-extinguishing chamber is measured and calculated by adopting a vacuum degree comparison method, and the storage life of the vacuum arc-extinguishing chamber is ensured.
On the other hand, compared with the existing vacuum degree measuring method of the vacuum arc-extinguishing chamber, the scheme disclosed by the disclosure can rapidly judge whether the current vacuum degree of the vacuum arc-extinguishing chamber product can meet the use requirement in a shorter time period through monitoring the variation trend of the vacuum degree.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic flow diagram illustrating a vacuum interrupter vacuum comparison detection method according to an exemplary embodiment;
FIG. 2 is another schematic flow diagram illustrating a vacuum interrupter vacuum ratio detection method according to an exemplary embodiment;
FIG. 3 is a block diagram illustrating an alignment detection system according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a schematic flow diagram illustrating a vacuum interrupter vacuum ratio detection method according to an exemplary embodiment, the method including the following steps.
And 101, measuring the first vacuum degree after the vacuum arc-extinguishing chamber is kept still for a first time period T1 to obtain a first vacuum degree P1.
And 102, measuring the secondary vacuum degree after the vacuum arc-extinguishing chamber is kept still for a second time T2 to obtain a second vacuum degree P2. After the vacuum arc-extinguishing chamber is discharged and aged at high pressure, the first time period T1 and the second time period T2 refer to the time required by the internal gas pressure of the vacuum arc-extinguishing chamber to reach dynamic balance, and the required time periods of different vacuum arc-extinguishing chambers may be different along with the development of the process, which is not limited by the disclosure.
After the first vacuum level P1 and the second vacuum level P2 are obtained, step 103 is performed.
And 104, if so, judging whether the second vacuum degree P2 meets the current vacuum degree value required to be met in the preset storage period according to a preset analysis algorithm, so as to judge whether the vacuum arc-extinguishing chamber is qualified.
In the embodiment of the disclosure, the change trend of the gas pressure in the vacuum arc-extinguishing chamber is measured and calculated by adopting a vacuum degree comparison method, so that products with qualified current vacuum degree but abnormal change trend of the vacuum degree can be screened out in advance, the gas leakage rate of the vacuum arc-extinguishing chamber product at a user position is reduced to the maximum extent, and the storage life of the vacuum arc-extinguishing chamber product is also ensured.
On the other hand, the time between two vacuum degree measurements in other methods is generally 7 days to 30 days, which takes a long time, and according to practical results, the time between two vacuum degree measurements in the embodiment of the disclosure can be shortened to 4 days, thereby improving the detection efficiency.
In the disclosed embodiment, the predetermined analysis algorithm is P2- (0.066-P1) × N/7300-P1 < 0. Wherein N represents actual number of days between the measurement of the first vacuum degree P1 and the measurement of the second vacuum degree P2. The analysis algorithm is calculated by theory, and the vacuum degree is less than 6.6 multiplied by 10 according to the standard after being stored for 20 years-2Pa, and calculating by combining practical application experience. In other embodiments, the analysis algorithm may be derived by theoretical calculation according to the vacuum degree in the standard and the predetermined storage period, which is only an example and not a specific limitation in the embodiments of the present disclosure.
In the embodiment of the present disclosure, the specific mathematical model of the comparison method may also be the model thereof, which is not limited by the present disclosure.
In the embodiment of the present disclosure, P1 and P2 need to satisfy the following two preset conditions.
The first condition is as follows: p2 differs from P1 by up to 1 order of magnitude.
And a second condition: p2 < 1.33X 10-3Pa。
The difference between P2 and P1 is obtained according to practical experience, and if the difference between P2 and P1 exceeds one order of magnitude, the vacuum degree is suddenly changed and unstable, and the vacuum degree P3 needs to be tested once again; the P2 should be less than a predetermined standard value, which is generally 1.33 × 10-3Pa。
As in the previous embodiment, if P2 and P1 do not satisfy the above two conditions, the vacuum level P3 needs to be tested once again. And standing the vacuum arc-extinguishing chamber for a third time T3, and measuring the third vacuum degree to obtain a third vacuum degree P3. If the difference between P3 and P2 is the same order of magnitude, judging according to P3, P2 and a preset analysis algorithm; if P3 differs from P1 by the same order of magnitude, a decision is made based on P3, P1 and a predetermined analysis algorithm. The predetermined analysis algorithm is shown in the foregoing embodiments, and the description is not detailed here.
In the embodiment of the present disclosure, in order to ensure the measurement stability and accuracy of the vacuum degree, the following conditions need to be satisfied. T1 and T2 are both larger than 72 hours, the environmental humidity is smaller than 60%, according to practical experience, the standing time is shorter than 72 hours, the gas pressure in the vacuum arc-extinguishing chamber does not reach dynamic balance, the environmental humidity is larger than 60%, the ceramic shell absorbs moisture, and the conditions of unstable vacuum degree and inaccuracy easily occur if the two conditions are not met in the actual detection process.
In the embodiment of the disclosure, in order to eliminate the systematic error of measurement, the same vacuum gauge needs to be used for vacuum measurement. Commonly used vacuum gauges include a pulse magnetron vacuum gauge, a Bayard-Alpert gauge (B-A gauge for short), and the like. Wherein, the pulse magnetic control vacuum gauge belongs to a cold cathode ionization gauge, and the Bayard-Alpert gauge belongs to a hot cathode ionization gauge. It should be noted that, with other types of vacuum timing, the mathematical analysis conditions of the measurement method in the embodiment of the present disclosure are still true.
According to practical experience, before the comparison detection method in the embodiment of the disclosure is adopted, the air leakage return rate of the vacuum arc-extinguishing chamber product is about 0.02% (20 air leakage occurs in 10 ten thousand products at the user), after the comparison detection method in the embodiment of the disclosure is adopted, the air leakage return rate is about 0.002%, and the accuracy rate of prejudging disqualification is 10 times of the previous accuracy rate. Therefore, the comparison detection method in the embodiment of the disclosure can significantly improve the accuracy of qualification prejudgment.
Next, an alignment detection method in the embodiment of the present disclosure is described according to a specific example.
In the embodiment of the disclosure, after the vacuum arc-extinguishing chamber is discharged and aged at high pressure, the measurement of the first vacuum degree is performed after the minimum 72 hours after the high-pressure aging, and the measurement is performed when the internal gas pressure reaches dynamic balance, so that the stability of the vacuum degree can be ensured, during the measurement, a mold is used for pulling the moving and fixed contacts of the vacuum arc-extinguishing chamber to a rated opening distance, and the first vacuum degree P1 is measured; the mixture was allowed to stand for a necessary period of time T2, and a second degree of vacuum P2 was measured. When the minimum time interval between two vacuum degree comparisons is 72 hours, the time interval is not set as an upper limit. According to a specific analysis calculation method (namely condition A), calculating a current vacuum degree value required to be met when the storage period of 20 years is met, judging a condition B-a condition F, and if the following 6 conditions are met, judging whether the vacuum degree P2 is qualified, namely the vacuum degree of the vacuum arc-extinguishing chamber is qualified.
Condition a: p2- (0.066-P1) N/7300-P1 < 0.
Condition B: p2 differs from P1 by up to 1 order of magnitude.
Condition C: p2 < 1.33X 10-3Pa。
Condition D: t1 > 72 hours, T2 > 72 hours.
Condition E: the detected environment humidity is less than 60%, and the vacuum arc-extinguishing chamber is preserved in the environment for more than 24 hours in advance.
Condition F: the vacuum degree measurement was carried out using the same vacuum gauge (a commonly used pulse magnetron vacuum gauge).
Fig. 2 is another schematic flow diagram of a vacuum interrupter vacuum ratio detection method according to an exemplary embodiment, and the method includes the following steps.
And step 207, judging that the result is qualified.
And step 210, judging that the result is unqualified.
Based on the same inventive concept, the embodiment of the present disclosure further provides a vacuum comparison detection system 300 for a vacuum interrupter, as shown in fig. 3, including a timing module 301, a vacuum measurement module 302, and a quality determination module 303; the timing module 301 is configured to determine whether the vacuum interrupter rest time length reaches a first time length T1 and a second time length T2; the vacuum measurement module 302 is configured to measure a first vacuum when the resting duration reaches the first duration T1, resulting in a first vacuum P1; measuring a second vacuum degree when the standing time reaches the second time T2 to obtain a second vacuum degree P2; the quality determination module 303 is configured to determine whether the first vacuum level P1 and the second vacuum level P2 satisfy a preset condition; if yes, judging whether the second vacuum degree P2 meets the current vacuum degree value required to be met by the preset storage period according to a preset analysis algorithm, and accordingly judging whether the vacuum arc-extinguishing chamber is qualified.
The system includes a condition determining module configured to determine whether the detected ambient humidity is less than 60%; and judging whether the same vacuum gauge is used for vacuum degree measurement in each measurement.
The vacuum degree measuring module comprises a pulse magnetic control vacuum gauge, a Bayard-Alpert gauge (B-A gauge for short) and the like. Wherein, the pulse magnetic control vacuum gauge belongs to a cold cathode ionization gauge, and the Bayard-Alpert gauge belongs to a hot cathode ionization gauge. It should be noted that, with other types of vacuum timing, the mathematical analysis conditions of the measurement method in the embodiment of the present disclosure are still true.
In the embodiment of the disclosure, the system further comprises an operation mold for pulling open the moving and static contacts of the vacuum arc-extinguishing chamber.
The quality judgment module 303 in the embodiment of the present disclosure includes a signal receiving submodule, a calculating submodule and a result output submodule; the calculation submodule judges the condition A, the condition B and the condition C in the embodiment and outputs signals to the signal receiving submodule; and when the result output submodule receives the signal of the calculation submodule, the output result is qualified or the output result is qualified.
With regard to the system in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A vacuum degree comparison detection method for a vacuum arc-extinguishing chamber is characterized by comprising the following steps:
after the vacuum arc-extinguishing chamber is kept still for a first time period T1, measuring the first vacuum degree to obtain a first vacuum degree P1;
after the vacuum arc-extinguishing chamber is kept still for a second time T2, measuring the second vacuum degree to obtain a second vacuum degree P2;
judging whether the first vacuum degree P1 and the second vacuum degree P2 meet preset conditions or not;
if so, judging whether the second vacuum degree P2 meets the current vacuum degree value required to be met in the preset storage period according to a preset analysis algorithm, and judging whether the vacuum arc-extinguishing chamber is qualified.
2. The method of claim 1, wherein the predetermined analysis algorithm is:
p2- (0.066-P1) N/7300-P1 < 0; wherein N represents actual number of days between the measurement of the first vacuum level P1 and the measurement of the second vacuum level P2;
if the result is less than 0, determining that the second vacuum degree P2 meets the current vacuum degree value required to be met by the preset storage period; if the result is 0 or more, it is not satisfied.
3. The method of claim 1, wherein determining whether the first vacuum level P1 and the second vacuum level P2 satisfy a preset condition comprises:
determining whether the second vacuum level P2 differs from the first vacuum level P1 by an order of magnitude less than or equal to 1 order of magnitude; and
judging whether the second vacuum degree P2 is smaller than a preset standard value;
if the judgment result is yes, judging that the first vacuum degree P1 and the second vacuum degree P2 meet the preset condition; if at least one judgment result is negative, judging that the first vacuum degree P1 and the second vacuum degree P2 do not meet the preset condition.
4. The method of claim 3, wherein after determining that the first vacuum level P1 and the second vacuum level P2 do not satisfy the preset condition, the method further comprises:
if the magnitude difference between the second vacuum degree P2 and the first vacuum degree P1 is more than 1 magnitude, after the vacuum arc-extinguishing chamber stands for a third time T3, measuring the third vacuum degree to obtain a third vacuum degree P3;
if the difference between the third vacuum degree P3 and the second vacuum degree P2 is in the same order of magnitude, judging according to the third vacuum degree P3, the second vacuum degree P2 and the preset analysis algorithm; if the difference between the third vacuum degree P3 and the first vacuum degree P1 is in the same order of magnitude, the judgment is carried out according to the third vacuum degree P3, the first vacuum degree P1 and the preset analysis algorithm.
5. The method of claim 1, wherein the first time period T1 > 72 hours; the second period of time T2 is > 72 hours.
6. The method according to claim 1, characterized in that the environment humidity of the testing environment where the vacuum interrupter is located is < 60%, and the vacuum interrupter is pre-stored in the testing environment for > 24 hours.
7. The method of claim 1, wherein each measurement uses the same vacuum gauge for vacuum measurements.
8. A vacuum degree comparison detection system of a vacuum arc extinguish chamber is characterized by comprising a timing module, a vacuum degree measurement module and a quality judgment module;
the timing module is configured to judge whether the standing time of the vacuum arc-extinguishing chamber reaches a first time length T1 and a second time length T2 respectively;
the vacuum degree measuring module is configured to measure a first vacuum degree when the standing time length reaches the first time length T1, and a first vacuum degree P1 is obtained; measuring a second vacuum degree when the standing time reaches the second time T2 to obtain a second vacuum degree P2;
the quality determination module is configured to determine whether the first vacuum level P1 and the second vacuum level P2 satisfy a preset condition; if so, judging whether the second vacuum degree P2 meets the current vacuum degree value required to be met in the preset storage period according to a preset analysis algorithm, and judging whether the vacuum arc-extinguishing chamber is qualified.
9. The system of claim 8, comprising a condition determining module configured to determine whether an ambient humidity of a detection environment in which the vacuum interrupter is located is less than 60%; and judging whether the same vacuum gauge is used for vacuum degree measurement in each measurement.
10. The system of claim 8, wherein the vacuum measurement module comprises a pulsed magnetron vacuum gauge or a Bayard-Alpert gauge.
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| US20150285863A1 (en) * | 2011-12-13 | 2015-10-08 | Finley Lee Ledbetter | System and Method to Predict a Usable Life of a Vacuum Interrupter in the Field |
| CN211265346U (en) * | 2020-03-24 | 2020-08-14 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | On-spot 6kV high-voltage vacuum switch vacuum degree quick test device |
-
2022
- 2022-01-25 CN CN202210088328.8A patent/CN114464497A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09101224A (en) * | 1995-10-05 | 1997-04-15 | Anelva Corp | Vacuum pressure measuring system |
| CN101661570A (en) * | 2009-09-24 | 2010-03-03 | 河北工业大学 | Expert system for measurement of vacuum degree and life management of vacuum arc extinguish chamber and application method |
| US20150285863A1 (en) * | 2011-12-13 | 2015-10-08 | Finley Lee Ledbetter | System and Method to Predict a Usable Life of a Vacuum Interrupter in the Field |
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| CN211265346U (en) * | 2020-03-24 | 2020-08-14 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | On-spot 6kV high-voltage vacuum switch vacuum degree quick test device |
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