气体间隙开关喷射等离子体触发性能劣化及剩余触发寿命预测研究

doi:10.19595/j.cnki.1000-6753.tces.222320

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Abstract

The cumulative effect of multiple discharges at high injected trigger energy causes a serious problem of trigger failure of the Plasma-Jet-Triggered gas gap switch. In order to achieve stable triggering conduction of the gas switch, the experiment of the influence of the injection energy rate on the plasma injection characteristics and the study of the degradation of the gas switch triggering performance under repeated triggering were carried out t based on the gas switch trigger life research platform. Finally, a residual trigger life prediction model was established to predict the gas switch trigger life based on the law of gradual change of the trigger characteristic parameters.
The results are as follows:
(1) The energy release rate is fast under the 40 μF capacitive discharge circuit, the high-temperature ablation environment is instantly established, and the plasma jet is rapidly formed and ejected from the cavity, but the main channel arc current acts on the trigger channel for a short period of time, the gas-producing material is not fully ablated, the gas molecules in the ferry vapor layer are not completely dissociated to form plasma, the conductivity of the plasma jet is low, and the aerodynamic force of the plasma jet accumulated in the short ablation time is insufficient, so the plasma jet duration and characteristic parameters are reduced, and the gas switch touch-on cannot be induced. Under the 240 μF high-capacity trigger circuit, the arc ablation time is extended by 1.3 times and the energy used for dissociation to form plasma is increased by 24.4%, which significantly improves the plasma jet parameters (jet area, height, velocity, etc.) and enables stable trigger conduction of the gas gap switch at a lower jet height.
(2) Under repeated triggering, the ablation products on the inner wall of the first cavity accumulate, the surface roughness increases, the discharge path gradually deteriorates, resulting in the gradual deterioration of the triggering discharge performance of the first cavity, and the discharge time delay Δt₀ between capacitors C₁ and C₂ increases. Under the effect of intense ablation along the surface arc current, the diameter of the second cavity nozzle gradually increases, the pressure difference between the inside and outside of the trigger cavity nozzle decreases, and the cumulative effect of the insulation material gas production capacity and arc energy utilization decreases, which leads to a decrease in the plasma jet characteristics parameters, causing a weakening of the distortion effect of the background electric field of the main gap of the switch, resulting in an increase in the breakdown time delay Δt₁. By the end of the trigger life, breakdown delay Δt₁ and on-time delay Δt₂ increased by 0.67 and 1.2 times, respectively. And the diameter of the first and second trigger cavity nozzles increased by nearly 2.9 and 3.3 times, respectively. Δt₀, Δt₁, Δt₂ can be used to characterize the degree of deterioration of the trigger first cavity, second cavity, and conduction performance, respectively. In practical applications, the threshold range in which the above characteristic quantities change can be detected to determine the superiority of the gas switch triggering performance and the trigger life stage.
(3) Based on the strong correlation law between plasma jet height and gas switch trigger performance degradation, the plasma jet height is used as the predictor. The gas switch trigger life prediction model ARIMA(1, 1, 2) was established after ADF test, ACF and PACF parameters identification, the information criterion judgment and significance test. The number of remaining trigger life predictions for the model is 398. The predicted values are basically consistent with the experimental results, and the remaining trigger life prediction error is within 10%, which can well meet the requirements of gas switch trigger life prediction.

Key words： Gas gap switch plasma jet trigger failure life prediction overvoltage and grounding

Received: 16 December 2022

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TM470

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	Dong Bingbing
	Guo Zhiyuan

Cite this article:

Dong Bingbing,Guo Zhiyuan. Study on Triggering Performance Degradation and Remaining Trigger Life Prediction of Gas Gap Switch Jet Plasma[J]. Transactions of China Electrotechnical Society, 0, (): 239604-239604.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.222320 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/239604

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