CN113325255B - Method for monitoring service life of bipolar continuous capillary ejector - Google Patents
Method for monitoring service life of bipolar continuous capillary ejector Download PDFInfo
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- CN113325255B CN113325255B CN202110569459.3A CN202110569459A CN113325255B CN 113325255 B CN113325255 B CN 113325255B CN 202110569459 A CN202110569459 A CN 202110569459A CN 113325255 B CN113325255 B CN 113325255B
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Abstract
The invention discloses a method for monitoring the service life of a bipolar continuous capillary ejector, which comprises the steps of determining working parameters of the bipolar continuous capillary ejector to be monitored, carrying out a service life experiment under the same condition to obtain the trigger capacitor residual voltage Ur of the bipolar continuous capillary ejector during each working in the whole service life period; obtaining a scatter diagram of the trigger capacitor residual voltage Ur changing along with the service life, and determining an alarm threshold value Urm of the trigger capacitor voltage Ur; deducing a relational expression between the service life and the residual voltage of the trigger capacitor based on the scatter diagram; and monitoring the service life of the bipolar continuous capillary ejector in actual operation based on real-time monitoring data of the bipolar continuous capillary in actual operation and the relational expression, and judging the working state of the equipment based on the alarm threshold value Urm.
Description
Technical Field
The invention relates to the technical field of quick bypass switches of power systems, in particular to a service life monitoring method for a bipolar continuous capillary ejector.
Background
The plasma jet triggered gas switch has the advantages of low working coefficient, high conduction speed, simple control and the like, and is widely applied to pulse power systems and electric power systems. For example, the fast control switch of the controllable lightning arrester in Jiangsu-white crane beach requires that the switch is conducted within 1ms after being triggered, the action of the controllable lightning arrester is realized, and the overvoltage of the system is limited, so that the high requirement on the reliability of the switch is provided.
Common spray triggering techniques are spark-discharge spray triggering and bipolar sequential triggering techniques. The bipolar continuous capillary ejector divides a long capillary into two parts by introducing the middle electrode, and is continuously triggered by the two sections of gap capillaries, so that the requirement on the trigger pulse voltage amplitude is remarkably reduced, the triggering reliability is improved, and meanwhile, the maximum triggerable length of the capillary can be increased under the same trigger pulse voltage amplitude to generate plasma with higher density. Therefore, the bipolar continuous capillary ejector is widely applied to a gas switch as a trigger device due to the excellent characteristics of the capillary ejector, can realize quick trigger conduction of the gas switch under an extremely low working coefficient, and has higher efficiency.
However, with the increase of the working frequency, due to the erosion of the arc, the electrodes are eroded, the aperture of the capillary tube is enlarged, the cavity is carbonized, and the like, so that the performance of the capillary tube ejector is degraded, and finally the life of the capillary tube ejector reaches the end, the trigger conduction of the switch is failed, and great hidden danger is brought to the reliability of the equipment. Therefore, the method for monitoring the service life of the bipolar continuous capillary ejector based on the trigger capacitor residual voltage monitoring is provided, the real-time monitoring of the ejector state is realized, the maintenance strategy is provided, and the method has important significance for improving the reliability of the system.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a method for monitoring the service life of a bipolar continuous capillary ejector, which realizes the real-time monitoring of the state of the ejector, provides a maintenance strategy and improves the reliability of a system.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention discloses a method for monitoring the service life of a bipolar continuous capillary ejector, which comprises the following steps:
determining working parameters of a bipolar continuous capillary ejector to be monitored, and performing a life test under the same condition to obtain the trigger capacitor residual voltage Ur of the bipolar continuous capillary ejector during each working in the whole life cycle;
obtaining a scatter diagram of the trigger capacitor residual voltage Ur changing along with the service life, and determining an alarm threshold value Urm of the trigger capacitor voltage Ur;
deducing a relational expression between the service life and the residual voltage of the trigger capacitor based on the scatter diagram;
and monitoring the service life of the bipolar continuous capillary ejector in actual operation based on real-time monitoring data of the bipolar continuous capillary in actual operation and the relational expression, and judging the working state of the equipment based on the alarm threshold value Urm.
In the method for monitoring the service life of the bipolar continuous capillary ejector, the working parameters of the bipolar continuous capillary ejector comprise structure size, working air pressure, working voltage, trigger capacitor voltage and/or gap switch distance.
In the method for monitoring the service life of the bipolar continuous capillary ejector, the characteristic value of trigger capacitor residual voltage Ur is extracted by monitoring the voltage and current of the bipolar continuous capillary ejector, and a parameter visualized scatter diagram and characteristic values such as an average value, a standard deviation, a maximum value, a minimum value and the like are obtained.
In the method for monitoring the service life of the bipolar continuous capillary ejector, a relation between the service life and the trigger capacitor residual voltage is fitted based on a scatter diagram: y = a x + b, wherein y is the trigger capacitor residual voltage, x is the working times, and a and b are parameters.
In the method for monitoring the service life of the bipolar continuous capillary ejector, when | Ur-y |/y > 20%, the y1 value on the 20% error line at the time is taken as an alarm threshold value Urm, and the 20% error line is obtained: y1= a x + b1, with the same slope as the resulting fitted relationship.
In the method for monitoring the service life of the bipolar continuous capillary ejector, the difference value between the residual voltage Ur value of the trigger capacitor measured at this time and the alarm threshold value Urm is compared, when the difference value is larger than the alarm threshold value, the working state of the equipment is considered to be good, otherwise, an alarm is sent out to remind of repairing or replacing the bipolar continuous capillary ejector.
In the technical scheme, the method for monitoring the service life of the bipolar continuous capillary ejector provided by the invention has the following beneficial effects: the method for monitoring the service life of the bipolar continuous capillary ejector realizes the monitoring of the service life of the bipolar continuous capillary ejector and judges the service life state by introducing characteristic value monitoring, establishing an alarm threshold value and judging logic, and provides the basis for operation and maintenance detection. The service life of the bipolar continuous capillary ejector is monitored in real time on line and the service life state of the bipolar continuous capillary ejector is judged, the risk of ejector triggering failure caused by the service life problem can be effectively avoided, and the reliability of the bipolar continuous capillary ejector is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic flow diagram of a bipolar junction capillary injector life monitoring method;
fig. 2 is a scatter diagram and a fitting curve of the trigger capacitance residual voltage Ur and the number of operations in the method for monitoring the lifetime of a bipolar junction capillary ejector.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 2 of the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, in one embodiment, a method of monitoring the life of a bipolar junction capillary injector of the present invention comprises,
determining working parameters of a bipolar continuous capillary ejector to be monitored, and performing a life test under the same condition to obtain the trigger capacitor residual voltage Ur of the bipolar continuous capillary ejector during each working in the whole life cycle;
obtaining a scatter diagram of the trigger capacitor residual voltage Ur changing along with the service life, and determining an alarm threshold value Urm of the trigger capacitor voltage Ur;
deducing a relational expression between the service life and the residual voltage of the trigger capacitor based on the scatter diagram;
and monitoring the service life of the bipolar continuous capillary ejector in actual operation based on real-time monitoring data of the bipolar continuous capillary in actual operation and the relational expression, and judging the working state of the equipment based on the alarm threshold value Urm.
In a preferred embodiment of the method for monitoring the lifetime of a bipolar junction capillary ejector, the operating parameters of the bipolar junction capillary ejector include the structural dimensions, the operating air pressure, the operating voltage, the trigger capacitor voltage and/or the gap switch distance.
In a preferred embodiment of the method for monitoring the service life of the bipolar continuous capillary ejector, a characteristic value of trigger capacitor residual voltage Ur is extracted by monitoring voltage and current of the bipolar continuous capillary ejector, and a parameter visualized scatter diagram and characteristic values such as an average value, a standard deviation, a maximum value and a minimum value are obtained.
In the preferred embodiment of the method for monitoring the service life of the double-pole continuous capillary ejector, the relation between the service life and the trigger capacitor residual voltage is fitted based on a scatter diagram: y = a x + b, wherein y is the trigger capacitor residual voltage, x is the working times, and a and b are parameters.
In the preferred embodiment of the method for monitoring the service life of the bipolar junction capillary ejector, when the value of | Ur-y |/y is more than 20%, the value of y1 on the 20% error line is taken as the alarm threshold value Urm, and the 20% error line is obtained: y1= a x + b1, with the same slope as the resulting fit.
In the preferred embodiment of the method for monitoring the service life of the bipolar continuous capillary ejector, the difference value between the residual voltage Ur value of the trigger capacitor measured at this time and the alarm threshold value Urm is compared, when the difference value is greater than the alarm threshold value, the working state of the equipment is considered to be good, otherwise, an alarm is sent out to remind of repairing or replacing the bipolar continuous capillary ejector.
In one embodiment, the method for monitoring the service life of the bipolar continuous capillary ejector realizes real-time online monitoring of the service life of the bipolar continuous capillary ejector, selects the trigger capacitor residual voltage Ur of the bipolar continuous capillary ejector during each working as a monitoring parameter, and obtains a specific relational expression through fitting and realizes quantification. Determining working parameters of a bipolar continuous capillary ejector to be monitored, and performing a life test under the same condition to obtain the residual voltage of a trigger capacitor in each working process of the bipolar continuous capillary ejector in the whole life cycle; obtaining a scatter diagram of the trigger capacitor residual voltage Ur changing along with the service life, and determining an alarm threshold value Urm of the trigger capacitor voltage Ur; deducing the relation between the service life and the trigger capacitor residual voltage, and obtaining a specific relational expression through inversion and fitting; and monitoring the service life of the bipolar continuous capillary ejector based on the real-time monitoring data and the obtained relational expression, and judging the working state of the equipment.
The method for monitoring the service life of the bipolar continuous capillary ejector selects the trigger capacitor residual voltage Ur of the bipolar continuous capillary ejector during each working as a monitoring parameter, and realizes quantitative analysis. In a preferred embodiment, the monitoring method realizes the life monitoring through the following 4 steps: (1) Determining working parameters of a bipolar continuous capillary ejector to be monitored, and performing a life test under the same condition to obtain the residual voltage of a trigger capacitor in each working process of the bipolar continuous capillary ejector in the whole life cycle; (2) Obtaining a scatter diagram of the trigger capacitor residual voltage Ur changing along with the service life, and determining an alarm threshold value Urm of the trigger capacitor voltage Ur; (3) Deducing the relation between the service life and the trigger capacitor residual voltage, and obtaining a specific relational expression through inversion and fitting; (4) And monitoring the service life of the bipolar continuous capillary ejector based on the real-time monitoring data and the obtained relational expression, and judging the working state of the equipment. For step (1), operating parameters that are completely consistent with those of an actual bipolar junction capillary injector need to be set first, and specifically include: the structure size, working air pressure, working voltage, trigger capacitance voltage and gap switch distance of the bipolar continuous capillary ejector; for the step (2), extracting a characteristic value of trigger capacitor residual voltage Ur by monitoring voltage and current of the bipolar continuous capillary ejector, and obtaining a parameter visualized scatter diagram and characteristic values such as an average value, a standard deviation, a maximum value and a minimum value; steps (3) and (4) will be described with reference to FIG. 2. For the step (3), when the relation between the trigger capacitor residual voltage Ur and the service life is deduced, the trigger capacitor residual voltage Ur shows an approximately linear reduction trend along with the aging of the service life, but the dispersity is gradually increased, and at the end of the service life, the condition that the trigger capacitor residual voltage Ur is obviously reduced can occur. The fitting relational expression of the trigger capacitor residual voltage Ur can be obtained as follows: y = a x + b, wherein y is the residual voltage of the trigger capacitor, x is the working frequency, and a and b are parameters; and (4) triggering the alarm threshold value Urm of the residual voltage Ur of the capacitor, wherein the determination method is that the numerical value of Ur is obviously deviated from the numerical value of the fitting curve in the experimental process, namely when the value of | Ur-y/y is more than 20%, the value of y1 of the 20% error line is taken as the Urm, the 20% error line (namely the Urm curve) can be obtained, and an alarm is given when the numerical value of Ur is obviously deviated from the numerical value of the fitting curve for the first time, namely the value of Ur is less than the Urm.
To illustrate the above process in detail, a preferred set of data sets is shown in a scatter plot in FIG. 2 and is described in detail herein. In the experimental process, in order to determine equivalent and accurate relations and threshold values to realize accurate monitoring of the service life state, it is necessary to ensure operating parameters completely consistent with those of an actual bipolar continuous capillary ejector, which specifically includes: the structure size, working air pressure, working voltage, trigger capacitance voltage and gap switch distance of the bipolar continuous capillary ejector.
In the preferred embodiment, the specific working conditions are that the structural size of the bipolar continuous capillary ejector is 3.5mm of a primary cavity, 4mm of a secondary cavity, and the material of the cavity is polytetrafluoroethylene; SF with absolute pressure of 0.35MPa 6 The distance of the main gap is 25mm, a 30 mu F energy storage capacitor is adopted, and the charging voltage is 2.8kV.
The value of the trigger capacitor residual voltage after each operation of the injector is obtained through the voltage monitoring equipment, the operation times and the trigger capacitor residual voltage corresponding to the operation times are stored, and a visual operation time and a scatter diagram of the trigger capacitor residual voltage corresponding to the operation times, an average value, a maximum value and a minimum value of the residual voltage can be output in real time through a computer, wherein the scatter diagram is shown in figure 2. Because the residual voltage is almost in a linear relation with the reduction of the working times, a fitting relation form of the trigger capacitor residual voltage Ur is obtained by adopting a least square method as follows: y = a x + b, wherein y is the residual voltage of the trigger capacitor, x is the working frequency, and a and b are parameters; in the present preferred embodiment, a = -0.000482, b = -2.656 can be obtained. The service life of the ejector under the same working condition can be monitored by adopting the formula.
Because the discharge has the dispersibility, in order to reasonably determine the allowable range of the residual voltage, a 20% error curve is provided through multiple times of experimental result analysis, and after a corresponding residual voltage fitting curve is obtained, a computer can synchronously and automatically draw a 20% error line so as to visually visualize the degree of the residual voltage value deviating from the fitting curve. In this embodiment, according to the obtained remaining voltage relation, a 20% error curve b1=2.1248, i.e. y1= -0.000482 × +2.1248, may be obtained. As long as the residual voltage is above the 20% error line, the device is considered to be reliable. The alarm threshold value Urm under each work is the residual voltage value corresponding to the 20% error line. Taking the 50 th operation as an example, if the residual voltage value Ur =2.70kV, the user can obtain Urm =2.1235kV, and at this time, ur is much higher than Urm, so it is determined that the user is in a normal operation state.
When the residual voltage is lower than the error line of 20%, the system gives an alarm and displays the residual voltage value Ur and the alarm threshold value Urm, taking the data deviation point appearing for the first time as an example, when the ejector works for 1638 times, the residual voltage Ur =1.03kV, at the moment, the system gives an alarm according to the Urm =1.3353kV obtained by the error line of 20%, and the system gives an alarm to prompt the maintenance or the replacement and outputs the working times, the Ur and the Urm values according to the judgment logic Ur < Urm.
Finally, it should be noted that: the embodiments described are only a few embodiments of the present application, not all embodiments, and all other embodiments that can be obtained by one skilled in the art without making any inventive effort based on the embodiments in the present application are intended to be covered by the present application.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (3)
1. A method for monitoring the service life of a capillary ejector of the bipolar junction type, comprising the steps of,
determining working parameters of a bipolar continuous capillary ejector to be monitored, and performing a life test under the same condition to obtain the trigger capacitor residual voltage Ur of the bipolar continuous capillary ejector during each working in the whole life cycle;
obtaining a scatter diagram of the trigger capacitor residual voltage Ur changing along with the service life, and determining an alarm threshold value Urm of the trigger capacitor voltage Ur;
deducing a relational expression between the service life and the trigger capacitor residual voltage based on the scatter diagram;
monitoring the service life of the actually-operated bipolar continuous capillary ejector based on real-time monitoring data of the actually-operated bipolar continuous capillary ejector and the relational expression, judging the working state of equipment based on the alarm threshold value Urm, extracting a characteristic value of trigger capacitor residual voltage Ur by monitoring the voltage and current of the bipolar continuous capillary ejector, and obtaining a scatter diagram with visualized parameters and an average value, a standard deviation, a maximum value and a minimum value, and fitting the service life of the scatter diagram and the trigger capacitor residual voltage based on the relational expression by adopting a least square method: y = a x + b, wherein y is the trigger capacitor residual voltage, x is the working times, a and b are parameters, the cavity material of the bipolar continuous capillary ejector is polytetrafluoroethylene, when | Ur-y |/y > 20%, the value of y1 on the 20% error line at the moment is used as the alarm threshold value Urm, and the 20% error line is obtained: y1= a x + b1, with the same slope as the resulting fit.
2. The method of claim 1, wherein the operating parameters of the bipolar junction capillary ejector include structural dimensions, operating air pressure, operating voltage, trigger capacitor voltage, and/or gap switch distance.
3. The method for monitoring the service life of a bipolar continuous capillary ejector according to claim 1, wherein the difference between the residual voltage Ur of the trigger capacitor measured this time and an alarm threshold value Urm is compared, when the difference is greater than the alarm threshold value, the working state of the device is considered to be good, otherwise, an alarm is given to remind the bipolar continuous capillary ejector to repair or replace.
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| DE102006050171A1 (en) * | 2006-10-25 | 2008-04-30 | Robert Bosch Gmbh | Characteristic diagram determining method for use in internal-combustion engine, involves assigning initial value, which is adjusted with defined injection quantity, as value to electrical parameter of defined injection quantity |
| CN102004216B (en) * | 2009-08-31 | 2012-09-26 | 中芯国际集成电路制造(上海)有限公司 | Method for testing instability of a negative bias temperature |
| CN102938968B (en) * | 2012-11-12 | 2015-05-27 | 西安交通大学 | Circuit for triggering two-gap plasma jet apparatus |
| CN104316879B (en) * | 2014-10-13 | 2018-08-10 | 珠海许继电气有限公司 | A kind of prediction technique in lead-acid batteries service life |
| CN110096737B (en) * | 2019-03-21 | 2023-04-07 | 国网内蒙古东部电力有限公司电力科学研究院 | Insulator life prediction method and device, computer device and storage medium |
| CN110430655B (en) * | 2019-08-06 | 2023-11-14 | 西安西交瑞力电气研究院有限公司 | Enclosed discharge gap triggered by plasma jet and application thereof |
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