Power Cable Fault Location Method And Line Detection Device To Achieve

Cables reduced a lot of overhead lines, increased the space on the road, avoided a lot of external accident. However, the cable event of failure, find difficulties delayed the restoration of electricity, in order to ensure safe operation and rapid diagnostic cables, repair fault, for cable line fault diagnosis and monitoring of important engineering significance.Currently offline power cable fault location technology has matured, but the power cable line fault location technology is not mature.Through this study common methods of power cable fault location and a new fault location system technology analysis and comparison, to achieve power cable line fault location, you need to consider the following questions:Are ungrounded system can produce effective fault transient traveling wave; How to accurately determine fault traveling wave arrival time and so on. In this paper,35kV XLPE power cables for the study, with PSCAD/EMTDC built a cable system model. The model is simulated fault current waveform characteristics of different neutral grounding under way Simulation analysis of the impact properties of the point of failure fault traveling wave; electrical epidemic wave spectrum analysis. At the same time, the use of wavelet transform local modulus maxi ma point mutation detection feature fault traveling wave to determine whether a failure occurs,If a fault occurs traveling wave algorithm is used to calculate the fault distance, and a simple cable lines for online fault location calculation, feasibility of online fault location, but also on the reality of the job case analysis.Text for online monitoring of power cable fault made the initial introduction, the main processes, the purpose of case studies were highlighted. Also on the side of the fault principle, software and hardware has made a brief introduction.There fore, this article also cited the latest GPRS technology, but also introduced a special computer operating software and interface。Real-time data transmission via GPRS technology to non-cable fault detection data substation information quickly transmitted back to the substation control center。Accelerate the operation of cable management and quick handling of cable faults. In the field of the application process for stability and real-time transmission of the system was verified.