Method for determining the age saturation based on the breakdown time and the breakdown voltage

Abstract

The application relates to a method for judging the aging saturation based on the breakdown time and breakdown voltage, which comprises the following steps: measuring, extracting values, drawing, judging whether the aging is stopped and stopping the aging, and utilizes the breakdown voltage or breakdown electric field strength waveform diagram of the breakdown time in the aging process of the pulse voltage, combines the breakdown time and the breakdown voltage or breakdown electric field strength value to instantly judge the aging stage and identify whether the aging enters the saturation stage, so as to improve the aging technology efficiency in a simple method and solve the problem of complex realization of the existing aging saturation judging technology.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vacuum arc-extinguishing chamber aging, and relates to a method for judging aging saturation based on breakdown time and breakdown voltage. BACKGROUND

[0002] At present, vacuum circuit breakers have occupied an absolute major share in the medium and low voltage power switch market; as an environmentally friendly power equipment, the vacuum circuit breaker is facing the urgent need for the development of high transmission grade circuit breakers to replace SF6 gas circuit breakers; as a core component of the vacuum circuit breaker, the insulation performance of the vacuum arc-extinguishing chamber determines the final insulation capability of the vacuum circuit breaker.

[0003] Aging technology is an effective means to improve the insulation performance of the vacuum arc-extinguishing chamber, can remove the gas and impurities adsorbed on the surface of the electrode, effectively improve the microtopography of the electrode surface, and improve the breakdown strength of the electrode gap of the vacuum arc-extinguishing chamber. With the aging, the final breakdown voltage or breakdown electric field strength enters the saturation stage, and the final insulation capability of the electrode gap is reached, and the application of the aging should be stopped.

[0004] However, in the method for judging the saturation stage in the existing aging technology, it is necessary to measure the circuit current to distinguish and judge whether the saturation stage is entered, which increases the complexity of the aging test circuit or judges whether the saturation stage is entered through the mathematical fitting formula of the breakdown voltage or breakdown electric field strength, which improves the complexity of the judgment of the aging saturation stage. Both methods cannot realize simple and real-time discrimination of the aging stage, and can be realized only after entering the saturation stage to a certain extent, causing energy waste and being very unfavorable to the on-site operation and implementation of the aging technical personnel, and seriously hindering the popularization and use of the aging technology method. SUMMARY

[0005] The technical problem to be solved by the application is to provide a method for judging aging saturation based on breakdown time and breakdown voltage, to use the breakdown voltage or breakdown electric field strength waveform of the breakdown time in the pulse voltage aging process, to combine the breakdown time and the breakdown voltage or breakdown electric field strength value to instantly judge the stage of the aging and to distinguish whether the aging has entered the saturation stage, to improve the efficiency of the aging technology in a simple method, and to solve the problem of complex implementation of the existing aging saturation judgment technology.

[0006] To solve the above technical problems, the technical solution adopted by the application is as follows:

[0007] S1, measuring, measuring the breakdown time voltage or electric field strength waveform in the aging process;

[0008] S2, extracting values, extracting the breakdown time and the breakdown voltage or breakdown electric field strength value from the breakdown voltage or breakdown electric field strength waveform;

[0009] S3, drawing, drawing the breakdown time and the breakdown voltage or the breakdown electric field strength change graph along with the breakdown times;

[0010] S4, judging whether the aging, when the breakdown time shows a gradually decreasing trend, the breakdown voltage or the breakdown electric field strength shows a gradually increasing trend, indicating that the aging has not been saturated, and the aging should be continued;

[0011] S5, stopping the aging, when the breakdown time fluctuates within a certain range, and the breakdown voltage or the breakdown electric field strength also fluctuates within a certain range, indicating that the breakdown reaches the saturation stage, and the aging can be stopped.

[0012] In S2, the breakdown time and the breakdown voltage or the breakdown electric field strength data are obtained in real time from the breakdown voltage or the breakdown electric field strength waveform.

[0013] The breakdown time and the breakdown voltage or the breakdown electric field strength data obtained in real time are used to judge whether the aging reaches the saturation stage.

[0014] The beneficial effects of the present application are:

[0015] In the pulse aging process, only the voltage across the vacuum arc-extinguishing chamber is passed through a voltage divider, and then the breakdown voltage or the breakdown electric field strength waveform of the breakdown time is measured by using a digital oscilloscope.

[0016] The breakdown time and the breakdown voltage or the breakdown electric field strength values are extracted from the breakdown waveform, and the breakdown time and the breakdown voltage or the breakdown electric field strength are combined to judge the stage of the aging and determine whether the aging enters the saturation stage, which creatively changes the technical method for determining the saturation stage of the aging, improves the aging technical efficiency of the vacuum circuit breaker, and solves the problem of complex implementation of the existing aging saturation stage judgment method. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described below in conjunction with the drawings and examples:

[0018] Fig. 1 The flowchart of the present application.

[0019] Fig. 2 The breakdown time changes with the breakdown times in the aging process when the time parameters of the applied impulse voltage waveform of the present application are 60 / 350us.

[0020] Fig. 3 The breakdown voltage or the breakdown electric field strength changes with the breakdown times in the aging process when the time parameters of the applied impulse voltage waveform of the present application are 60 / 350us.

[0021] Fig. 4 The breakdown time changes with the breakdown times in the aging process when the time parameters of the applied impulse voltage waveform of the present application are 60 / 350us. Fig. 2 and Fig. 3Comparison images superimposed on each other. Detailed Implementation

[0022] like Figs. 1-4 A method for determining aging saturation based on breakdown time and breakdown voltage includes the following steps:

[0023] S1, Measurement, measuring the voltage or electric field strength waveform at the breakdown moment during the aging process;

[0024] S2, extract values, extract the breakdown time and breakdown voltage or breakdown electric field strength values ​​from the breakdown voltage or breakdown electric field strength waveform;

[0025] S3, Plotting, depicting the change of breakdown time and breakdown voltage or breakdown electric field strength with the number of breakdowns;

[0026] S4. To determine whether aging is necessary, if the breakdown time gradually decreases while the breakdown voltage or breakdown electric field strength gradually increases, it indicates that aging is not yet saturated and aging should continue.

[0027] S5, stop aging. When the breakdown time fluctuates within a certain range, and the breakdown voltage or breakdown electric field strength also fluctuates within a certain range, it indicates that the breakdown has reached the saturation stage, and aging can be stopped.

[0028] The above method utilizes the waveform of the breakdown voltage or breakdown electric field intensity at the breakdown moment during the pulse voltage aging process, and combines the breakdown moment and the breakdown voltage or breakdown electric field intensity values ​​to instantly determine the aging stage and whether the aging has entered the saturation stage. This method improves the efficiency of aging technology in a simple way and solves the problem of the complexity of existing aging saturation judgment technology.

[0029] Preferably, to measure the breakdown voltage or breakdown electric field intensity waveform at the breakdown moment during the aging process, it is only necessary to measure the voltage across the vacuum interrupter using a voltage divider and then a digital oscilloscope.

[0030] Preferably, the aging process only requires measuring the breakdown voltage or breakdown electric field strength waveform at the moment of breakdown.

[0031] In a preferred embodiment, in S2, the breakdown time and breakdown voltage or breakdown electric field strength data are obtained in real time from the breakdown voltage or breakdown electric field strength waveform.

[0032] In the preferred embodiment, the aging process is determined in real time by acquiring the breakdown time and breakdown voltage or breakdown electric field strength data.

[0033] Preferably, the aging technology process only needs to extract the breakdown time and breakdown voltage or breakdown electric field strength data from the breakdown voltage or breakdown electric field strength waveform at the breakdown time, that is, to draw the breakdown time and breakdown voltage or breakdown electric field strength graph with the change of the breakdown times, so as to realize the simple and instant judgment of the aging stage.

[0034] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application. The embodiments in the present application and the features in the embodiments can be combined with each other as long as there is no conflict. The protection scope of the present application should be based on the technical solutions recited in the claims, and the equivalent replacement solutions of the technical features recited in the claims are within the protection scope. That is, the equivalent replacement improvements within this range are also within the protection scope of the present application.

Claims

1. A method for determining burn-in saturation based on breakdown time and breakdown voltage, characterized by, It comprises the following steps: S1, measuring, measuring the voltage or electric field intensity waveform at the breakdown moment during the aging process; S2, extracting values, extracting the breakdown moment and breakdown voltage or breakdown electric field intensity values from the breakdown voltage or breakdown electric field intensity waveform; S3, plotting, plotting the breakdown moment and breakdown voltage or breakdown electric field intensity variation diagram with the breakdown number; S4, judging whether to age, when the breakdown moment shows a gradually decreasing trend and the breakdown voltage or breakdown electric field intensity shows a gradually increasing trend, it indicates that the aging is not saturated and should continue aging; S5, stopping aging, when the breakdown moment fluctuates within a certain range and the breakdown voltage or breakdown electric field intensity also fluctuates within a certain range, it indicates that the breakdown reaches the saturation stage and the aging can be stopped; In S2, the breakdown moment and breakdown voltage or breakdown electric field intensity data are obtained in real time from the breakdown voltage or breakdown electric field intensity waveform.

2. The method of claim 1, wherein the method is characterized by: The breakdown moment and breakdown voltage or breakdown electric field intensity data obtained in real time are used to judge whether the aging reaches the saturation stage in real time.

Images