船舶静电场抑制效果的影响因素研究

Study on influencing factors of static electric field suppression effect of a ship

针对不同成因的电场,开发了相应的电场抑制装置.为了研究不同装置之间的相互影响,在分析主动轴接地系统的基础上,提出了舰船主要电结构的等效电路模型,并在此基础上进行了船模实验,讨论了对静电场抑制效果的影响因素.结果表明:航速对静电场及其抑制效果的影响可以忽略;涂层电阻的增加会使静电场减小,但不会影响静电场抑制效果;主动轴接地系统和静电场抑制装置的工作会影响彼此信号,轴频电场抑制装置和静电场抑制装置的工作会影响彼此信号,当对静电场进行抑制时,轴频电场会有所增强,而降低轴-地电阻后,尽管会使静电场增强,但同时也会提高静电场抑制效果,最终能够使静电场比降低轴-地电阻前下降到更低的程度.实验结果验证了等效电路模型的有效性.

Pertinent devices were developed to suppress the electric fields according to different causes.To study the interaction among different devices,the equivalent circuit model of the main electrical structure of ship was proposed based on the active-shaftgrouding(ASG) system.A ship model experiment was carried out based on this circuit model,and the influencing factors of static electric field suppression effect were discussed.Results show that the influence of speed on static electric field and its suppression effect can be ignored;The static electric field would be suppressed while the coating resistance increases, but the variation of coating resistance would not affect the effect of electrostatic field suppression;the ASG system and the static electric field suppression device would affect the signals from each other.The shaft-rate electric field would be enhanced when the static electric field was suppressed. Reduction of shaft-ground resistance would enhance the electrostatic field, but the static electric field suppression effect would be improved meanwhile,and the electrostatic field would be suppressed to a lower degree compared with the situation before reducing the shaft-ground resistance. The effectiveness of the equivalent circuit model was verified by the experimental results.