CN112798242A - Method for calculating spring fatigue degree of vacuum circuit breaker - Google Patents
Method for calculating spring fatigue degree of vacuum circuit breaker Download PDFInfo
- Publication number
- CN112798242A CN112798242A CN202011559977.9A CN202011559977A CN112798242A CN 112798242 A CN112798242 A CN 112798242A CN 202011559977 A CN202011559977 A CN 202011559977A CN 112798242 A CN112798242 A CN 112798242A
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- spring
- circuit breaker
- vacuum circuit
- fatigue degree
- torsion
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 238000007906 compression Methods 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 21
- 239000003350 kerosene Substances 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims description 9
- 206010016256 fatigue Diseases 0.000 description 39
- 238000004146 energy storage Methods 0.000 description 27
- 230000008569 process Effects 0.000 description 10
- 230000009467 reduction Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The invention discloses a method for calculating spring fatigue of a vacuum circuit breaker. Sequentially taking out vacuum circuit breaker spring kerosene to be detected and calculating fatigue degree to be immersed; the pressure detection device is placed in a spring compression fatigue degree detection unit for detecting pressure; the tension detection unit is placed in the spring tension fatigue degree detection unit to detect tension; the torsion detecting unit is placed in the spring torsion fatigue degree detecting unit to detect torsion. The invention solves the problem of how to calculate and obtain the spring suitable for the fatigue degree of the vacuum circuit breaker.
Description
Technical Field
The invention relates to the technical field of vacuum circuit breakers, in particular to a method for calculating the spring fatigue degree of a vacuum circuit breaker.
Background
The vacuum circuit breaker mainly comprises a vacuum arc extinguish chamber, a closing spring, an energy storage system, an overcurrent release, a switching-on and switching-off coil, a manual switching-on and switching-off system, an auxiliary switch, an energy storage indicating piece and the like, wherein the closing spring is connected with an energy storage shaft in the energy storage system through an energy storage connecting lever, and a gear reduction box in the energy storage system drives the energy storage shaft to rotate clockwise step by step. In the process of closing the vacuum circuit breaker, when the moving contact is close to the termination position, the circuit breaker can be reliably closed only by providing a proper amount of overshoot energy by the closing spring.
In the energy storage process, a reduction gearbox of the vacuum circuit breaker provides power for the energy storage process, the power generated by the reduction gearbox is finally transmitted to a driven gear outside the reduction gearbox, the driven gear drives an energy storage shaft to rotate clockwise, and then a closing spring connected with the energy storage shaft is stretched, the stretching force of the closing spring is increased along with the increase of the stretching variable of the closing spring, because the closing spring is connected with the energy storage shaft through an energy storage connecting lever, the acting force of the stretching force which is transmitted to the energy storage shaft through the energy storage connecting lever and changes along the anticlockwise direction on the energy storage shaft is increased, so that the energy storage shaft has a trend of rotating along the anticlockwise direction, the rotation of the energy storage shaft is not facilitated, the smooth completion of the energy storage process is influenced, and more serious, if the acting force is greater than the clockwise power applied to the energy storage shaft by the, the energy storage shaft can rotate, so that the energy storage process can be completely impossible to carry out, and the vacuum circuit breaker can not realize closing.
When the closing spring needs to be stretched and charged, the top part is stretched preferentially all the time, and possibly when one section of the top part is stretched to the maximum elastic deformation amount, one section of the bottom part is not stretched. After long-term use, the top of the energy storage spring is easy to generate elastic fatigue, and the bottom of the energy storage spring is still intact, so that the whole energy storage mechanism fails. The unreasonable arrangement mode of the energy storage mechanism shortens the service life of the energy storage spring. Control of the fatigue of the spring is therefore crucial.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a method for calculating the fatigue degree of a spring of a vacuum circuit breaker, which can solve the problem of how to calculate and obtain the spring suitable for the fatigue degree of the vacuum circuit breaker.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for calculating the spring fatigue degree of a vacuum circuit breaker comprises the following steps
S1: taking out one vacuum circuit breaker spring to be detected and calculating the fatigue degree, placing the vacuum circuit breaker spring to be detected and calculating the fatigue degree in kerosene, immersing the vacuum circuit breaker spring to be detected and calculating the fatigue degree in the kerosene for 1min, taking out and airing;
s2: taking the dried vacuum circuit breaker spring, and operating the dried vacuum circuit breaker spring according to the descriptions of the step S3, the step S4 and the step S5 in sequence;
s3: placing the dried vacuum circuit breaker spring in a spring compression fatigue degree detection unit, and simultaneously compressing the vacuum circuit breaker spring at two ends of the vacuum circuit breaker spring along the axial direction of the vacuum circuit breaker spring through the spring compression fatigue degree detection unit until the spring compression fatigue degree detection unit reaches a specified position;
s30: the return spring compresses the fatigue degree detecting unit and takes out the vacuum circuit breaker spring, detects the length of the compressed and reset vacuum circuit breaker spring, if the difference value between the length of the compressed and reset vacuum circuit breaker spring and the original length of the vacuum circuit breaker spring is in accordance with the designated value, the step S4 is executed;
s4: placing the dried vacuum circuit breaker spring in a spring stretching fatigue degree detection unit, and stretching the vacuum circuit breaker spring at two ends of the vacuum circuit breaker spring along the axial direction of the vacuum circuit breaker spring through the spring stretching fatigue degree detection unit until the spring stretching fatigue degree detection unit reaches a specified position;
s40: the return spring stretches the fatigue degree detection unit and takes out the vacuum circuit breaker spring, the length of the stretched and reset vacuum circuit breaker spring is detected, and if the difference value between the length of the stretched and reset vacuum circuit breaker spring and the original length of the vacuum circuit breaker spring meets a specified numerical value, the step S5 is executed;
s5: the vacuum circuit breaker spring after being placed and dried is arranged in the spring torsion fatigue degree detection unit, the spring torsion fatigue degree detection unit is used for simultaneously torsion the vacuum circuit breaker spring along the circumferential direction of the vacuum circuit breaker spring at the two ends of the vacuum circuit breaker spring, and the spring torsion fatigue degree detection unit reaches a specified angle.
Preferably, in step S3, the spring compression fatigue degree detecting unit includes a first linear cylinder, a first mounting plate, a first extending portion, and a first positioning plate, where the first linear cylinder, the first mounting plate, the first extending portion, and the first positioning plate are symmetrically disposed at two ends of a spring of the vacuum circuit breaker, a cylinder body of the first linear cylinder is fixedly disposed, a piston rod of the first linear cylinder is fixedly connected to the first mounting plate, the first mounting plate is fixedly connected to the first extending portion, and the first extending portion is slidably connected to the first positioning plate.
According to the preferable technical scheme, the first mounting plate is provided with a pressure reading unit, the pressure reading unit is in communication connection with a computer terminal, the pressure reading unit continuously detects the pressure of the spring of the vacuum circuit breaker and continuously sends a pressure signal to the computer terminal, and the computer terminal generates a curve of the pressure of the spring of the vacuum circuit breaker along with the change of time according to the pressure signal sent by the pressure reading unit.
Preferably, in step S4, the spring tension fatigue degree detection unit includes a second linear cylinder, a second mounting plate, and a second clamping jaw that can be symmetrically disposed at two ends of the vacuum circuit breaker spring, a cylinder body of the second linear cylinder is fixedly disposed, a piston rod of the second linear cylinder is fixedly connected to the second mounting plate, and the second clamping jaw is disposed at one side of the second mounting plate.
According to the preferable technical scheme, the second mounting plate is provided with a tension reading unit, the tension reading unit is in communication connection with a computer terminal, the tension reading unit continuously detects tension of the spring of the vacuum circuit breaker and continuously sends tension signals to the computer terminal, and the computer terminal generates a curve of the tension of the spring of the vacuum circuit breaker along with time according to the tension signals sent by the tension reading unit.
Preferably, in step S5, the spring torsional fatigue degree detection unit includes a third motor, a third mounting plate, and a third clamping jaw that can be symmetrically disposed at two ends of the vacuum circuit breaker spring, a body of the third motor is fixedly disposed, a rotating shaft of the third motor is fixedly connected to the third mounting plate, and the third clamping jaw is disposed at one end of the third mounting plate.
According to the preferable technical scheme, the third mounting plate is provided with a torsion reading unit, the torsion reading unit is in communication connection with a computer terminal, the torsion reading unit continuously detects the torsion of the spring of the vacuum circuit breaker and continuously sends a torsion signal to the computer terminal, and the computer terminal generates a curve of the torsion of the spring of the vacuum circuit breaker along with time according to the torsion signal sent by the torsion reading unit.
The invention discloses a method for calculating the spring fatigue degree of a vacuum circuit breaker, which has the following advantages:
the foreign bodies attached to the surface of the spring of the vacuum circuit breaker are removed through kerosene soaking, the influence of the foreign bodies attached to the surface of the spring of the vacuum circuit breaker on the stress of the spring of the vacuum circuit breaker is reduced, and the detection and calculation results are improved. The compression, the pulling-up and the torsion of the vacuum circuit breaker spring are detected, the actual compression, the pulling-up and the torsion limit values of the vacuum circuit breaker spring can be obtained, secondary quality detection can also be carried out on the vacuum circuit breaker spring, and the vacuum circuit breaker spring which fails when reaching the limit value can be directly scrapped.
The axial compression limit value of the vacuum circuit breaker spring is detected by axially compressing the vacuum circuit breaker spring, and calculation and analysis are performed according to the recorded data. The limit value of the axial lifting of the vacuum circuit breaker spring is detected by axially lifting the vacuum circuit breaker spring, and calculation and analysis are carried out according to recorded data. The limit value of the circumferential torsion of the vacuum circuit breaker spring is detected by circumferentially amending the vacuum circuit breaker spring, and calculation and analysis are carried out according to the recorded data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a spring compression fatigue detection unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a spring tension fatigue detection unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a spring torsional fatigue detection unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but 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.
As shown in fig. 1 to 3, a method for calculating spring fatigue of a vacuum circuit breaker according to an embodiment of the present invention includes the following steps:
s1: and taking out one vacuum circuit breaker spring to be detected and calculated according to the degree of exhaustion, placing the vacuum circuit breaker spring to be detected and calculated according to the degree of exhaustion in kerosene, immersing the vacuum circuit breaker spring to be detected and calculated according to the degree of exhaustion in the kerosene, keeping the kerosene for 1min, taking out and airing. The foreign bodies attached to the surface of the spring of the vacuum circuit breaker are removed through kerosene soaking, the influence of the foreign bodies attached to the surface of the spring of the vacuum circuit breaker on the stress of the spring of the vacuum circuit breaker is reduced, and the detection and calculation results are improved.
S2: and taking the dried vacuum circuit breaker spring, and operating the dried vacuum circuit breaker spring according to the descriptions of the step S3, the step S4 and the step S5 in sequence. The compression, the pulling-up and the torsion of the vacuum circuit breaker spring are detected, the actual compression, the pulling-up and the torsion limit values of the vacuum circuit breaker spring can be obtained, secondary quality detection can also be carried out on the vacuum circuit breaker spring, and the vacuum circuit breaker spring which fails when reaching the limit value can be directly scrapped.
S3: the vacuum circuit breaker spring after placing to dry is in spring compression degree detecting element tired out, degree detecting element tired out through spring compression simultaneously at the axial compression vacuum circuit breaker spring of vacuum circuit breaker spring both ends along vacuum circuit breaker spring, and degree detecting element reachs the assigned position until spring compression is tired out. The axial compression limit value of the vacuum circuit breaker spring is detected by axially compressing the vacuum circuit breaker spring, and calculation and analysis are performed according to the recorded data.
S30: the return spring compresses the exhaustion degree detecting unit and takes out the vacuum circuit breaker spring, detects the length of the compressed and reset vacuum circuit breaker spring, and if the difference between the length of the compressed and reset vacuum circuit breaker spring and the original length of the vacuum circuit breaker spring conforms to a designated value, performs step S4. The follow-up detection is carried out under the condition that the spring of the vacuum circuit breaker can still normally reset after reaching the extreme position so as to keep the accuracy of a follow-up calculation structure.
S4: the vacuum circuit breaker spring after placing to dry is in the tensile degree detecting element that tireds out of spring, and the tensile degree detecting element that tireds out of spring is simultaneously at the both ends of vacuum circuit breaker spring along the tensile vacuum circuit breaker spring of vacuum circuit breaker spring's axial, and degree detecting element reachs the assigned position until the tensile degree that tireds out of spring. The limit value of the axial lifting of the vacuum circuit breaker spring is detected by axially lifting the vacuum circuit breaker spring, and calculation and analysis are carried out according to recorded data.
S40: the return spring stretches the fatigue degree detecting unit and takes out the vacuum circuit breaker spring, detects the length of the stretched and reset vacuum circuit breaker spring, and if the difference between the length of the stretched and reset vacuum circuit breaker spring and the original length of the vacuum circuit breaker spring meets a specified value, step S5 is performed. The follow-up detection is carried out under the condition that the spring of the vacuum circuit breaker can still normally reset after reaching the extreme position so as to keep the accuracy of a follow-up calculation structure.
S5: the vacuum circuit breaker spring after being placed and dried is arranged in the spring torsion fatigue degree detection unit, the spring torsion fatigue degree detection unit is used for simultaneously torsion the vacuum circuit breaker spring along the circumferential direction of the vacuum circuit breaker spring at the two ends of the vacuum circuit breaker spring, and the spring torsion fatigue degree detection unit reaches a specified angle. The limit value of the circumferential torsion of the vacuum circuit breaker spring is detected by circumferentially amending the vacuum circuit breaker spring, and calculation and analysis are carried out according to the recorded data.
In step S3, the spring compression fatigue degree detecting unit includes a first linear cylinder 11, a first mounting plate 12, a first extending portion 13, and a first positioning plate 14, which are symmetrically disposed at two ends of a spring of the vacuum circuit breaker, wherein a cylinder body of the first linear cylinder 11 is fixedly disposed, a piston rod of the first linear cylinder 11 is fixedly connected to the first mounting plate 12, the first mounting plate 12 is fixedly connected to the first extending portion 13, and the first extending portion 13 is slidably connected to the first positioning plate 14. The two first positioning plates 14 are close to each other until abutting, namely, the designated limit position.
In order to continuously record the compression process so as to be convenient for calculation and analysis, the first mounting plate 12 is provided with a pressure reading unit which is in communication connection with a computer terminal, the pressure reading unit continuously detects the pressure of the spring of the vacuum circuit breaker and continuously sends a pressure signal to the computer terminal, and the computer terminal generates a curve of the pressure of the spring of the vacuum circuit breaker along with the time according to the pressure signal sent by the pressure reading unit.
In step S4, the spring tension fatigue degree detecting unit includes a second linear cylinder 21, a second mounting plate 22, and a second clamping jaw 23 that can be symmetrically disposed at two ends of the vacuum circuit breaker spring, a cylinder body of the second linear cylinder 21 is fixedly disposed, a piston rod of the second linear cylinder 21 is fixedly connected to the second mounting plate 22, and the second clamping jaw 23 is disposed at one side of the second mounting plate 22. The two second linear cylinders 21 are contracted to the shortest position, which is the designated limit position.
In order to continuously record the stretching process so as to facilitate calculation and analysis, the second mounting plate 22 is provided with a tension reading unit, the tension reading unit is in communication connection with a computer terminal, the tension reading unit continuously detects the tension of the spring of the vacuum circuit breaker and continuously sends a tension signal to the computer terminal, and the computer terminal generates a curve of the change of the tension of the spring of the vacuum circuit breaker along with time according to the tension signal sent by the tension reading unit.
In step S5, the spring torsional fatigue detection unit includes a third motor 31, a third mounting plate 32, and a third clamping jaw 33 that can be symmetrically disposed at two ends of a spring of the vacuum circuit breaker, a body of the third motor 31 is fixedly disposed, a rotating shaft of the third motor 31 is fixedly connected to the third mounting plate 32, and the third clamping jaw 33 is disposed at one end of the third mounting plate 32. The third motor 31 may rotate by a designated angle to twist the vacuum interrupter spring.
In order to continuously record the torsion process so as to be convenient for calculation and analysis, a torsion reading unit is arranged on the third mounting plate 32 and is in communication connection with a computer terminal, the torsion reading unit continuously detects the torsion of the spring of the vacuum circuit breaker and continuously sends a torsion signal to the computer terminal, and the computer terminal generates a curve of the torsion of the spring of the vacuum circuit breaker along with the change of time according to the torsion signal sent by the torsion reading unit.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for calculating the spring fatigue degree of a vacuum circuit breaker is characterized by comprising the following steps: comprises the following steps
S1: taking out one vacuum circuit breaker spring to be detected and calculating the fatigue degree, placing the vacuum circuit breaker spring to be detected and calculating the fatigue degree in kerosene, immersing the vacuum circuit breaker spring to be detected and calculating the fatigue degree in the kerosene for 1min, taking out and airing;
s2: taking the dried vacuum circuit breaker spring, and operating the dried vacuum circuit breaker spring according to the descriptions of the step S3, the step S4 and the step S5 in sequence;
s3: placing the dried vacuum circuit breaker spring in a spring compression fatigue degree detection unit, and simultaneously compressing the vacuum circuit breaker spring at two ends of the vacuum circuit breaker spring along the axial direction of the vacuum circuit breaker spring through the spring compression fatigue degree detection unit until the spring compression fatigue degree detection unit reaches a specified position;
s30: the return spring compresses the fatigue degree detecting unit and takes out the vacuum circuit breaker spring, detects the length of the compressed and reset vacuum circuit breaker spring, if the difference value between the length of the compressed and reset vacuum circuit breaker spring and the original length of the vacuum circuit breaker spring is in accordance with the designated value, the step S4 is executed;
s4: placing the dried vacuum circuit breaker spring in a spring stretching fatigue degree detection unit, and stretching the vacuum circuit breaker spring at two ends of the vacuum circuit breaker spring along the axial direction of the vacuum circuit breaker spring through the spring stretching fatigue degree detection unit until the spring stretching fatigue degree detection unit reaches a specified position;
s40: the return spring stretches the fatigue degree detection unit and takes out the vacuum circuit breaker spring, the length of the stretched and reset vacuum circuit breaker spring is detected, and if the difference value between the length of the stretched and reset vacuum circuit breaker spring and the original length of the vacuum circuit breaker spring meets a specified numerical value, the step S5 is executed;
s5: the vacuum circuit breaker spring after being placed and dried is arranged in the spring torsion fatigue degree detection unit, the spring torsion fatigue degree detection unit is used for simultaneously torsion the vacuum circuit breaker spring along the circumferential direction of the vacuum circuit breaker spring at the two ends of the vacuum circuit breaker spring, and the spring torsion fatigue degree detection unit reaches a specified angle.
2. The method of calculating spring fatigue of a vacuum circuit breaker according to claim 1, wherein: in step S3, the spring compression fatigue degree detecting unit includes a first linear cylinder, a first mounting plate, a first extending portion, and a first positioning plate, where the first linear cylinder, the first mounting plate, the first extending portion, and the first positioning plate can be symmetrically disposed at two ends of a spring of the vacuum circuit breaker, a cylinder body of the first linear cylinder is fixedly disposed, a piston rod of the first linear cylinder is fixedly connected to the first mounting plate, the first mounting plate is fixedly connected to the first extending portion, and the first extending portion is slidably connected to the first positioning plate.
3. The method of calculating spring fatigue of a vacuum circuit breaker according to claim 2, wherein: the first mounting plate is provided with a pressure reading unit, the pressure reading unit is in communication connection with a computer terminal, the pressure reading unit continuously detects the pressure of the vacuum circuit breaker spring and continuously sends a pressure signal to the computer terminal, and the computer terminal generates a curve of the pressure of the vacuum circuit breaker spring changing along with time according to the pressure signal sent by the pressure reading unit.
4. The method of calculating spring fatigue of a vacuum circuit breaker according to claim 1, wherein: in step S4, the spring tension fatigue degree detection unit includes a second linear cylinder, a second mounting plate, and a second clamping jaw that can be symmetrically disposed at two ends of the vacuum circuit breaker spring, a cylinder body of the second linear cylinder is fixedly disposed, a piston rod of the second linear cylinder is fixedly connected to the second mounting plate, and the second clamping jaw is disposed at one side of the second mounting plate.
5. The method of calculating spring fatigue of a vacuum circuit breaker according to claim 4, wherein: the second mounting plate is provided with a tension reading unit which is in communication connection with a computer terminal, the tension reading unit continuously detects tension of the vacuum circuit breaker spring and continuously sends tension signals to the computer terminal, and the computer terminal generates a curve of the tension of the vacuum circuit breaker spring changing along with time according to the tension signals sent by the tension reading unit.
6. The method of calculating spring fatigue of a vacuum circuit breaker according to claim 1, wherein: in step S5, the spring torsional fatigue degree detection unit includes a third motor, a third mounting plate, and a third clamping jaw that can be symmetrically disposed at two ends of the vacuum circuit breaker spring, a body of the third motor is fixedly disposed, a rotating shaft of the third motor is fixedly connected to the third mounting plate, and the third clamping jaw is disposed at one end of the third mounting plate.
7. The method of calculating spring fatigue of a vacuum circuit breaker according to claim 6, wherein: the third mounting plate is provided with a torsion reading unit which is in communication connection with a computer terminal, the torsion reading unit continuously detects the torsion of the vacuum circuit breaker spring and continuously sends a torsion signal to the computer terminal, and the computer terminal generates a curve of the torsion of the vacuum circuit breaker spring changing along with time according to the torsion signal sent by the torsion reading unit.
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| CN202011559977.9A CN112798242A (en) | 2020-12-25 | 2020-12-25 | Method for calculating spring fatigue degree of vacuum circuit breaker |
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| CN202011559977.9A CN112798242A (en) | 2020-12-25 | 2020-12-25 | Method for calculating spring fatigue degree of vacuum circuit breaker |
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Application publication date: 20210514 |