| Power cable power supply is safe, reliable, many advantages to beautify the city,along with the rapid development of social production, the power supply cable covers anarea of less, the cable capacitance can improve the power factor, the power cable powertransmission way occupy the dominant position of power supply. Because the cablegenerally wear pipe buried underground or into the cable trench laying, complexenvironment, at the same time with the increase in number of cables and extend theoperation time, cable more and more failures. Once the underground power cable faultoccurs, quickly detect the exact location of the fault point is more difficult, need to spenda longer time, waste a lot of manpower, material resources, but also cause incalculableloss of outage.Power cable fault detection to improve the processing speed of the cable fault findingtechnology, plays a decisive role in the power system reliability and stability. Due to thelimitations of power cable line invisibility and test conditions make the cable fault findinghas certain difficulty, so how to reasonably select the fault test equipment and test methodof quickly and accurately find the cable fault shorten outage time is the cable operators arevery concerned about the issue, but also has a very important theoretical and practicalsignificance of this research.In this paper, according to the Shantou Power Supply Bureau110kV cable operationand maintenance experience, the study compared the power cable fault at various practicaldetecting technology, fast and reasonable measure method and means are given accordingto different types of the fault and properties. And according to the actual operation of the110kV power cable main insulation and the outer sheath of the cable fault fault, analysisof the nature and causes of the fault point method, discusses in detail the pre positioningand precise location, so as soon as possible to repair, restore the power supply, and ensurethe safe and economic operation of the power grid. |
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