【摘要】 XLPE电缆外护套是防止水分进入主绝缘的第一道关口,因此对外护套故障点的及时定位、修补尤为重要。介绍了应用S3000电缆故障定位系统对外护套故障定位的现场特例,并指出采用高压电桥预定位和跨步电压法精确定位相结合是最快捷的电缆外护套故障测寻方法。鉴于外护套故障定位仪对干燥地面下电缆故障定位存在灵敏度不足问题,通过改进定位仪电路,提高了仪器的测试灵敏度。更多还原

【Abstract】 The oversheath of XLPE cables is the first barrier to prevent water from entering major insulation;as a result the timely trouble-locating/shooting for it is very important. In this paper,the special cases of using S3000 trouble-locating system for the said purpose are described,and the combination of pre-location by the HV bridge and precise location by the step-voltage method is indicated as the most efficient method. In view of the inadequate sensitivity of the oversheath trouble-locater being used for troubles under dry ground,an improvement on the locater’s circuit is made to raise its sensitivity.更多还原