Study On The Inprovement Of Value Engineering About Undercurrent Route Selection Installment

The undercurrent electrical network system is refers to the electrical power system which neutral point not to earth or earth after the extinguishing coil, the system which below 110KV adopts this way majority in our country.Before 2000, the method which discover faulty line's is shuts off feed lines on power distribution equipment in the transformer substation gradually, when which feed line is cut-off, the voltage recovery normal,it must be the faulty line. Although this method could find the faulty line, but will have the non-faulty line to excise, to discover the breakdown to need the time long shortcoming. The shortcoming is right line will be excised, the time discovers the breakdown is too long.The undercurrent route selection installment is one kind of new relay protection installment, It appears on the market about for 15 years.when the undercurrent electrical network occurs single-phase earths,for one second later,It can select the faulty line automatically.Its market demand scale should approximately in 3,500,000,000 Yuan.But the undercurrent route selection installment present existence serious problem, like the route selection is inaccurate, the failure rate is high.Through the understanding and the analysis on hardware and the software state of play's in market.This article has determined the improvement program which take embedded computer as new generation undercurrent route selection installment's hardware disposition ,it including the ARM processor and linux operating system.After the technical change, The procedure expanded the gathering signal scope, increased algorithmic logics about the data pretreatment technology, the continual route selection technology, the effective territory technology, line capacitance law, wavelet law and so on.After the software and the hardware promotion, we have performe the massive field test, this method's rate of accuracy has obtained 100% route selection.