【正文】 the signal’s discontinuity instants leads to the signal average value much lower than the peak value. At the d4,d5 and d6 levels along with the high frequency ponents,a run proportional to the absolute average value (). the k th value of which calculated in the Nwidth window can he found from the relationship:is presented. It is assumed that the shorted line’s discrimination during the intermittent earth is carried out by paring the C ratio of the absolute instantaneous value and absolute average value to the value of the ratio:. Fivelevel deposition of currenf signal,Undamaged line, Btype intermittent fault. Fivelevel deposition of current signal,damaged line, Ctype intermittent fault. Fivelevel deposition of currenf signal,Undamaged line, Ctype intermittent fault. Fivelevel deposition of current signal,damaged line, Dtype intermittent fault. Fivelevel deposition of current signal,undamaged line, Dtype intermittent fault. Discrimination algorithm for line with intermittent fault to ground (PAC)When the protection meets the condition (1l), the breaker will open provided that the zero voltage ponent, ( =l),proving the existence of the eanh fault still remains,and any pulse (OS) switching off the admittance part of protection ( =0) was not sent out. The aleorithm representing the described idea of discrimination of the line touched by an intermittent fault to ground (PAC) is shown in .In ,the block scheme of an adaptive earth fault protection being an extension of the conventional admittance type protection (see ) is supplementary blocks are: WD block in which the multilevel deposition of measuring signals takes place,and the PAC parator (peakaverage parator) in which the line discrimination algorithm is implemented (see ).. Adaptive earth fault protection block schemeDue to the logic structure of protection, the WD and PAC blocks enhance functionality and reliability of the faults elimination where the protections operating according to the classic criterions are unreliable.VI. FINALREMARKSReported examples of the,andmeasuring signals during the intermittent earth faults show that detection of such aults as well as identification of damaged line can pose problems to the conventional earth fault protecting difficulties are higher when the inner pause during the fault exceeds tens of milliseconds. As such pauses can occur in the balanced medium voltage distribution networks, a number of nonbroken off earth faults should be expected. Therefore, new protective criterions eliminating such a trouble are to be searched. Having analysed the examples of intermittent faults it can be easily perceived that the multilevel wavelet deposition enables to separate the signal features typical for the protected line conditions. All reported examples have shown that the disturbance of the original signal appears especially evident at initial deposition levels (dl, d2, d3) for the signals ing from both the damaged line and the undamaged line. For higher levels (d4, d5, d6), the images of signal ponents in damaged and undamaged lines bee evidently different thus enabling the damaged line discrimination as well as the fault elimination. e馬,陪F?lm嫄W壙獑??N€?)?0?q??3拞屓??p勌m:b5a漬璺1疆lv~0瘩艌v€ ??`@2屘b瘌Tq 〆妋4U~K袢,疀薤`,A6玭$? $徤?|ッ?罪=T?G駁op1尚懇袹戦疈u圻?賡O?a?*{p懡0L)w懱拽?E???/扢]?9镃/潺hRＱ烞b蔔Ye嚁劑Bb?捚?慳曥T?UFU Z!醋M[M蘇g壺鰷伸???qfg%厧139。t?€ 戯憤焿驆罳騙^萡P?躀cP縮蒕\?nP砫 }?C?Z豸值?箾殶竛吐K?M轂?藑琶q@v栃?? 譇橒忋喏曚NI耔nENB峢mT鸏s眑+?該Ζ|紖?!汩?膾f抙氄宨澻S箔XM竴玐訨?V?腡?,B衹絵2n吞輷匽e馬e馬,陪F?lm嫄W壙獑??N€?)?0?q??3拞屓??p勌m:b5a漬璺1疆lv~0瘩艌v€ ??`@2屘b瘌Tq 〆妋4U~K袢,疀薤`,A6玭$? $徤?|ッ?罪=T?G駁op1尚懇袹戦疈u圻?賡O?a?*{p懡0L)w懱拽?E???/扢]?9镃/潺hRＱ烞b蔔Ye嚁劑Bb?捚?慳曥T羈8?p~蟇7硏楓{?泝Z祘?$賕?諑矽?|D蚈/盰,vDlE嵮禋T?NI耔nENB峢mT鸏s眑+?該Ζ|紖?!汩?膾f抙氄宨澻S箔XM竴玐訨?V?腡?,B衹絵2n吞輷匽之銻蚗v枉h5di:t詮I?懣忋忑殆懛嗕!V汁 赸l偎蠽れMヌn?~鈹舤Y?忩eF39。Hga}厏a堳膷Q?h芛vf???瘐?c+粂鰌q惦ez 赸l偎蠽れMヌn?~鈹舤Y?忩eF39。Hga}厏a堳膷Q?h芛vf???瘐?c+粂鰌q惦e摭F訥,ドRU?遴?eyk?窅脆?_躵y膠?宗卝?XA蛋?H7曮Z e馬,陪F?lm嫄W壙獑??N€?)?0?q??3拞屓??p勌m:b5a漬璺1疆