ࡱ> .0-5@ 7bjbj22 "HXX &&&&L&l@:^'(((((((k9m9m9m9m9m9m9$:RH=Z9i(((((9((9d/d/d/(((k9d/(k9d/d/x/1?2(R' 9&, 22:0@:2,=-=?2=?2@((d/(((((99!V#D/FV# Determinarea permitivitatii electrice si a factorului de pierderi la materialele electroizolante solide Chestiuni de studiat : Se vor utiliza valorile marimilor tg si r pentru diferite materiale electroizolante si se vor compara cu cele din tabelele (existente in indrumar sau inn cursul tiparit). Determinarile se vor face la frcvente f=100 Hz si f=1 kHz. 2.Materiale utilizate : 1-Prespan 6-Azbest 2-Micanita 7-Rasina epoxidica 3-Textolit 8-Pertinax 4-Sticlotextolit 9-Polietilena 5-PVC plastificat 10-Sticla 3.Formule de calcul : C0=0* EMBED Equation.3 ; C0=capacitatea condensatorului cu aer avand configuratia geometrica identica cu cea a condensatorului de incercat; A=aria suprafetei electrodului, cu diametru D=10 cm; d=distanta dintre electrozi (egala cu grosimea probei); Cr=Cx-Cc-Cp r= EMBED Equation.3  Cc=capacitatea cablului de masura; Cc=61 pF Cr=capacitatea reala a condensatorului de masura; Cp=capacitatea parazita; Cp=43 pF r=8.85*10-12 F/m RLC=220 V(~) Material de incercatGrosime dFrecventa fCXCrCo rtgObservatiimmHzpFpFpFadimensionaleSticla4.11000218114169.440.670.17100226122169.440.720.026Polietilana0.4610003732691510.270.1780.00241003732691510.270.1780.002Pertinax0.781000387283890.670.3170.013100380276890.670.30.020Pasina epoxilica2.96100017672234.70.30.00510017773234.70.30.002Azbest1.04100023713366.80.1990.0610026916566.80.2470.148PVC plastificat0.821000375271847.220.3190.064100408304847.220.350.068Sticlotextolit1.821000275171381.710.440.005 t v y L X Z \   2468˹˹˫˹˹˹˹˹˹˫zg$jhquhquCJEHH*UaJj<7@ hquCJUVaJ$jhquhquCJEHH*UaJj7@ hquCJUVaJjhquCJH*UaJhquCJH*aJhqu5CJaJhquCJaJhCJH*aJhCJaJh5CJaJh5CJ$aJ$hF5CJ$aJ$(X  x y 8 Z \ F:h^hgd & FgdgdF$a$gd78XZ\>@prt~*,BDFHJLNPRTVXZ\^dfz|~̹hFh]CJH*aJh]CJH*aJh]CJaJhFh]CJaJh]CJaJhFCJH*aJhFCJH*aJhFCJaJhquCJaJhquCJH*aJ@((,@DJPX^f|~Ff $$Ifa$gdFh^hgdh^hgdqu $$Ifa$gdFkd$$Ifl4ִvC0 @,"K t06    44 la    $*+,8=BFJRXFf Ff $$Ifa$gdF   #$)+,78<=ABEFIJQRWX^`acfgjknovw|}h]CJaJh]CJaJhFh]CJaJZX_`abcgkow}FfFf Ff $$Ifa$gdF    !'(FfFf $$Ifa$gdF    !&()/0459:=>ABFGLMQSTVYZ]^abfglmrtuh]CJaJhFh]CJaJh]CJaJZ()05:>BGMRSTUVZ^bgmstuFf$$Ff ! $$Ifa$gdFFf4444Ff0-Ff,*Ff(' $$Ifa$gdF44444 4 4 4444444"4$4%4-4.424347484;4<4?4@4F4G4K4L4P4R4S4U4X4Y4\4]4`4a4g4h4l4m4q4s4t4{4|444444444444444444444444444h]CJaJUh]CJaJhFh]CJaJZ100275171381.710.440.006Micanita0.821000310206847.220.240.14100318214847.220.250.25Prespan1.481000480376469.40.430.016100656552469.40.670.018Textolit1.881000336232369.530.620.19100536432369.531.170.442 Exemplu de calcul pentru micanita : Cr=Cx-Cc-Cp Cr=310-61-43=206 Cr=318-61-43=214 C0=0* EMBED Equation.3 =8.85*10-12* EMBED Equation.3 =8.85*10-12* EMBED Equation.3 =847.22 pF r= EMBED Equation.3 = EMBED Equation.3 =0.24 r= EMBED Equation.3 =  EMBED Equation.3 =0.25 44 4 4444#4$4%4.43484<4@4G4L4Q4R4S4T4U4Y4]4a4h4Ff83 $$Ifa$gd]Ff40 $$Ifa$gdFh4m4r4s4t4|444444444444444444444FfD<Ff@9Ff<6 $$Ifa$gdF $$Ifa$gd]444444444444444444444444444455 5 5555555@5A5C5D5F5G5I5J5K5b5c5q5r5555556666 606ĻİĻİĻĻĢjhCJH*UaJhhCJaJhCJH*aJhCJaJhyCJH*aJhyCJaJhFCJaJh]CJaJhFh]CJaJh]CJaJ=4444444444444445 55555555:5=5h^hgdFfLBFfH? $$Ifa$gdF=5K5r556N7P777^gdCjh^hgdh^hgdgdh^hgdy06264666F6L6N6P6v6x6z6|666666666666666 77ǾϵǾϵqiǵϵZj<7@ hCJUVaJhyCJaJ$jHhquhCJEHH*UaJjz7@ hCJUVaJ$jJFhquhCJEHH*UaJj7@ hCJUVaJhCJH*aJhCJH*aJhCJaJjhCJH*UaJ$jMDhquhCJEHH*UaJj7@ hCJUVaJ77777<7>7@7B7D7L7N7P7T7V7X7Z777777777ɖxiVɖGj7@ hCjCJUVaJ$jNhquhCjCJEHH*UaJj<7@ hCjCJUVaJhCjhCjCJaJhCjhCJaJh]CJaJhCjCJaJ$jLhCjhCjCJEHH*UaJj7@ hCjCJUVaJhCjCJH*aJjhCjCJH*UaJhCJaJjhCJH*UaJ$jJhquhCJEHH*UaJ7777777ĹhhCJaJhCjhCjCJaJh]CJaJhCjCJaJjhCjCJH*UaJ$jQhCjhCjCJEHH*UaJ 1h/ =!"#$%Dd lb  c $A? ?3"`?2Gwwڋ f\X}f#D`!wwڋ f\X}fXHx5O;A}U? 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