Multi-electrode microsensor for detecting copper metal vapor concentration

Abstract

The invention discloses a multi-electrode microsensor for detecting copper metal vapor concentration. The microsensor comprises a discharge cathode comprising a metal discharge needle array, a first insulated support, an extraction electrode, second insulated supports and a collecting electrode, wherein the discharge cathode is grounded, and generates a strong electric field in a small local area at the tips of metal discharge needles, thereby realizing the field emission of electrons; the first insulated support is used for isolating the discharge cathode from the extraction electrode; the extraction electrode is connected with a direct current power supply, and is used for extracting positive ion current generated by the ionization, collision and diffusion of detected gas to realize the separation of the electrons from the positive ion current; the second insulated supports are used for isolating the extraction electrode from the collecting electrode; the collecting electrode is connected with the direct current power supply, and the positive ion current is accelerated by the electric field so as to be absorbed by the collecting electrode. According to the microsensor, the detected gas can weakly discharge electricity under the conditions of normal temperature, atmospheric pressure and low voltage, and corresponding discharge current can be obtained on the collecting electrode; the microsensor can be used for detecting the copper metal vapor concentration in an arc extinguishing chamber of a circuit breaker.

Description

technical field [0001] The invention relates to the field of electric life detection of circuit breakers, in particular to a multi-electrode microsensor for detecting the concentration of copper metal vapor. Background technique [0002] In the power system, the circuit breaker is one of the most important equipment in switching electrical equipment, and its performance reliability is related to the safe operation of the power system. Practice shows that the electrical life of the circuit breaker is an important parameter for life diagnosis of the circuit breaker. Currently, high pressure SF 6 Mechanical characteristics of circuit breakers, partial discharge (insulation characteristics), SF 6 Gas characteristics have been thoroughly studied, and there are practical and practical technologies available, but high-pressure SF 6 The research on electrical life characteristics of circuit breakers is only based on N-I b There are a few rough estimation methods such as curve an...

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Problems solved by technology

However, this method does not consider the complex relationship between the current flowing through the two ends of the contact and the ablation of the circuit breaker contact, nor does it consider how much energy flowing through the contact is used for the ablation of the contact, so the obtained results very rough and difficult to apply

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