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Method for measuring inner running state of vaccum arc-chutes based on X-ray capacity

A vacuum interrupter, X-ray technology, applied in the electrical field, can solve the problems of lack of great practical value, complex equipment, low accuracy, etc., to achieve convenient and easy detection methods, ensure repeatability, and solve problems with poor repeatability. Effect

Inactive Publication Date: 2007-07-18
CHINA ELECTRIC POWER RES INST
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Problems solved by technology

[0003] But there is a problem with this method: that is, the repeatability is poor, the continuous measurement error is large, the whole equipment is complicated, and the cost is high
Therefore, the accuracy of this method is low and lacks great practical value

Method used

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  • Method for measuring inner running state of vaccum arc-chutes based on X-ray capacity

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Embodiment Construction

[0015] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] See Figure 2, in the figure: 1. Vacuum interrupter; 2. Power frequency high voltage; 3. Measuring probe of X-ray dose rate meter; 4. Measuring computer; 5. Released X-rays.

[0017] During the power frequency withstand voltage test, a high voltage is applied across the vacuum interrupter 1, and electrons escape from the surface of the cathode due to field emission. These electrons are accelerated to bombard the anode under the action of a high voltage electric field, and are generated based on the bremsstrahlung mechanism. X-ray.

[0018] Set the opening distance of the vacuum interrupter 1 to be judged at 2-22 mm, then apply a power frequency voltage of 40-100 kV, and measure the emission intensity of its X-ray 5 .

[0019] It has been verified by experiments that when the internal vacuum degree of the arc extinguishing...

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Abstract

The invention relates to a method based on X-rays quantity change to judge running state for the vacuum arc extinguish chamber inner. It includes the following steps: while doing power frequency withstand voltage test, exerting high voltage to the two ends of the vacuum arc extinguish chamber; running off electron from the cathode surface caused by field emission; these electrons post bombing anode under the action of high voltage electric filed; basing on bremsstrahlung mechanism to generate X-rays; measuring them; if their releasing quantity is not stable, this can explain that the inner vacuum degree reaches safety lower limit, or electricity life reaches critical. The invention can realize wireless measuring without any electric connection with the tested vacuum arc extinguish chamber which not only has safe and reliable operation, but also can realize online monitoring for the vacuum circuit breaker.

Description

technical field [0001] The invention relates to a method for judging the degree of vacuum in a vacuum interrupter and judging its electrical life according to the number of times the vacuum interrupter can break a rated short-circuit current in the field of electrical technology, in particular to a method for judging the vacuum interrupter based on the change of X-ray quantity Methods for the internal running state. Background technique [0002] At present, the method used for judging the degree of vacuum in the vacuum interrupter is the "magnetron discharge method", and its working principle is shown in Figure 1. The axial high-voltage electric field 2 of the chamber, so that the electrons in the tube can obtain enough kinetic energy to ionize the gas molecules after they collide in the process of moving from the anode to the cathode; The charged particles between the heads move in a spiral trajectory to increase the collision path, thereby improving the full ionization of...

Claims

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Application Information

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IPC IPC(8): G01L21/00G01L21/30G01L21/36G01L21/34G01R31/00G01R31/327G01R31/25G01R31/12
Inventor 李炜郭媛媛王承玉龙西明高晖
Owner CHINA ELECTRIC POWER RES INST
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