| The Nei kun electrification railroad is the biggest electricity customer for the Zhao tong supply power bureau,following the railroad line totally has already 6 transformer substations,total capacity is 248 MVA,being a special customer of the Zhao tong electricity net,this burden haven't line,dissymmetry and the characteristics of the motion, it infuses into unbalance harmonic toward the Zhao tong electricity net over a long period of time,and unavoidably the harmonic enlarge and often damages the equip of without achievement in expiation,results in protect a mistake to move,the electric power calculate of the precision also is subjected to influence for the vital 220 kV Zhao tong and 220 kV Da guan transformer substation,the its harmonic pollution has already seriously threatenned safe stability of the Zhao tong electricity net,as to it's the influence of other customer also allows of no to neglect.To availably carry on manage the harmonic of the Zhao tong electricity net,first carry on a valid monitor,carry on system analysis,then draw up according to the monitor income data practical viable manage a project,then can attain the expectation effect.The traditional monitor appearance data collects to be subjected to work time restriction,can't actually the hour acquire reaction electric power quality various index signs,but the harmonic's time for take place and way have very greatly and at will sex and adopt normal regulations a monitor a method can't be accurate to control its true circumstance and dynamic state regulation,the harmonic of the Zhao tong electricity net is not availably monitored for long time.Secondly,the appearance data of the tradition monitor is analytical main is analyze by artificial,the work have great capacity,the conclusion is also not enough objective.The power quality online monitoring system is ability solid hour monitor a charged barbed wire net movement circumstance,according to solid hour collect,deliver to the center server through the network,then pass the appropriation analysis software to carry on calculation to various index signs analytical,and according to nation related standard carry on judgment,finally with chart as a result carry on keeping view exportation,this is good effect to electric power quality various index sign analysis.Tally up the Zhao tong electricity net to circulate experience over a long period of time and in the past artificial test result with the harmonic,discover the 220kV electric voltage grade a transformer substation of medium,low side electric power quality existence the problem was more,strange time the harmonic electric voltage and current's being super to mark a circumstance be more widespread,because of medium,low side is not line burden more, exist harmonic source customer.Moreover,because of the low side of the 220kV transformer substation generally installs the invalid of compensate equip capacitor set,but the capacitor set be easily subjected to harmonic bane,so the 220kV and 110kV of the transformer substation not line customer place circuit and the 35kV low side invalid of achievement compensate should be established a monitor.According to this principle, drew up the constitution project of the Zhao tong electricity net power quality online monitor system,in the 220kV Zhao tong and 220kV Da guan transformer substations having seven the 110kV circuit lines carry and 35kV three circuit lines invalid of the achievement compensate established ten monitors to order.After the system being builted up,and applied that system to analyze Zhao tong electricity net the first half of 2007 power quality,the first step confirms a Zhao tong electricity net the existent key problem of the power quality is harmonic,voltage fluctauation and flicker in the near future,that system of successful application laid the foundation for the further work... |
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