摘要
通过交流杂散电流干扰下的阴极保护电位分析,研究交流杂散电流存在情况下并行间距、并行长度、交叉角度及交流干扰电压对埋地管道阴极保护系统的干扰规律具有实际意义。交流干扰存在情况下,干扰源与管道并行间距、并行长度及交流干扰电压对管地电位的影响因阴极保护电压不同而发生不同趋势的改变,阴保电压为-1.1 V是一个转折电位,阴保电位较小时管地电位正移,且随着管道与交流干扰源之间距离越小正移越多,很有可能会超出最小保护电位范围;而阴极保护电压较大时管地电位受交流杂散电流干扰而负移,且随着管道与交流干扰源之间距离越小负移越多,很有可能会超出最大保护电位范围。交流干扰存在情况下干扰源与管道交叉时,交叉角度越大,对管地电位的影响越小,当交叉角度增大到90°时,阴极保护下的管地电位与无干扰时电位之间差值最小。
Through analysis of the cathodic protection potential under AC stray current interference,the interference regularity of the parallel distance,parallel length,cross angle and AC interference voltage under AC stray current on the cathode protection system of the buried pipelines was studied.Results showed that under the presence of AC interference,the parallel distance and length between the interference sources and the pipelines as well as the influence of AC interference voltage on the pipe-to-soil potential had different changing trends with different cathode protection voltages.The negative voltage at-1.1 V was a turning point and the pipe-to-soil potential shifted positively when the cathodic protection potential was small,which shifted positively more and more and was likely to exceed the minimum protection potential range with the decrease of the distance between the pipeline and the AC interference source.On the other hand,when the cathodic protection voltage was large,the pipeto-soil potential shifted negatively due to the stray current interference,which shifted negatively more and more and was likely to exceed the maximum protection potential range with the decrease of the distance between the pipeline and the AC interference source.Furthermore,under the presence of AC interference,the influence of the crossing angle between the interference source and the pipeline on the pipe-to-soil potential was reduced with the increase of the crossing angle.When the cross angle was increased to 90°,the difference between the pipe-to-soil potential under the cathodic protection and the potential without the interference was the smallest.
出处
《材料保护》
CAS
CSCD
北大核心
2016年第8期76-79,9,共4页
Materials Protection
基金
国家自然科学青年基金(51206179)
中央高校基金项目(3122014D027)
中国民航大学实验技术创新基金(01-14-01)资助
关键词
交流杂散电流干扰
并行间距
并行长度
交叉角度
交流干扰电压
阴极保护系统
AC stray current interference
parallel distance
parallel length
cross angle
AC interference voltage
cathodic protection system
