Analysis Of DC Power Line Loop Alarm And Positioning Method

DC system for stable operation of the power system plays a very important rolein the ground or ring failure once it occurs, the system will reduce the insulation,thereby causing the protective device malfunction or reject trips. Such as high-impedance grounding occurred, the loop is grounded, AC-DC cascade to the groundand balancing these complex situations occur, along with on-site temperature rising,but not conducive to accurately locate ground. Two DC system there are many formsof wiring and power supply, the cause of failure of the ring there are many, not thenormal wiring or equipment failure, etc., will be the current system a serious securityrisk. Practice has proved that the loop troubleshooting requires a long time forcalculation, analysis, and the need to support a large number of field experience,which greatly reduces the troubleshooting efficiency and reduce the safety factor ofthe DC system. By studying online alarm loop positioning method to analyze varioustroubleshooting methods grounding principles, advantages and disadvantages, andprinciples of composition and the loop line and ring the alarm device fault locationdevice a brief analysis, summary, preliminary to two devices have a more intuitiveunderstanding of the DC system failure to achieve precise positioning and timelymanner. Meanwhile through on-site analysis of actual cases describe, summarizeprocessing method and troubleshooting steps, further close to the actual work, butalso to achieve a shared case summary provides a fresh way to share and operationaltroubleshooting for the future, but also on device the application of the actual work ofthe show explained. Case representative, is a timely reminder for the future andmethods of work available.