ࡱ> 796w'Pbjbj .Z     4444,`D4>=======$?]Bp= =  m>,,,N  =,=,,;z=L (V<=>0><B+B(z=B z=8,==,>B :'3 (4) LABORATORINIS DARBAS APSAUGOS SU ATSKIRIAN IAISIAIS APSAUGOS TRANSFORMATORIAIS TYRIMAS Darbo tikslas: Iatirti /taiss, naudojan is atskirian iuosius apsaugos transformatorius, pavojingum ir iasiaiakinti atskirs faktoris /tak pavojingumo laipsniui. Darbo u~daviniai: Aptarti atskirian isjs apsaugos transformatoris pagrindinius duomenis (arba kas turi bkti /raayta /renginio pase). Iaanalizuoti apkrovs jungimo galimybes prie atskirian isjs apsaugos transformatoris. Apibendrinti apsaugos transformatoris panaudojimo galimybes. Pateikti iavadas ir apibendrinimus. Pateikti literatkros bei informacijos aaltinis sraa. Darbo eiga: 1. Apsauga su II klass transformatoriumi Tyrimo metu naudojama apkrova yra kilnojama lempa, sujungta su kilnojamu atskirian iuoju apsaugos transformatoriumi. `is transformatorius yra visiakai izoliuotas (~ymjimas ). 1 pav. pavaizduota bandyms schema, kurioje atskiriantysis apsaugos transformatorius ~ymimas ~enklu  EMBED Equation.DSMT4 . Esminis apsaugos ypatumas, kad apsaugos transformatorius yra visiakai izoliuotas. Jis nra sujungtas su /~eminimo laidu. Apkrova sujungta su apsaugos transformatoriumi be /~eminimo.  1 pav. Bandyms schema su atskirian iuoju apsaugos transformatoriumi 1 u~duotis Sujungti 1 pav. schem, naudojant transformatoris turinti aiuos duomenis: pirmin ir antrin /tampa 23V (230V); pilnutin galia 20VA. Prijungti laboratorinio stendo maitinimo laid prie ~ 220 V, 50 Hz maitinimo aaltinio. .jungti stendo ( Netz / power, ~alias) jungikl/ ir pagrindin/ bei schemos automatinius iajungiklius (automatus). Nustatyti, ar ~mogui gresia pavojus (ar avie ia aviesos diodas) ir iamatuoti prisilietimo /tampos vert: Ar ~mogui gresia pavojus? Prisilietimo /tampa UT ? Rezultatas: Savaime suprantama, kad tariamam ~mogui pavojus negresia ir prisilietimo /tampos vert lygi nuliui. 2. Apkrova sujungta su neapsaugota srovei laid~ia dalimi. `is bandymas parodo ~mogaus apsaug, kai apkrova yra visiakai sujungta su neapsaugota srovei laid~ia /taiso dalimi. 2 u~duotis Pakeisti 1 pav. schem, pagal 2 pav. pavaizduot trumpj/ susijungim /taiso apkrovos grandinje.  2 pav. Trumpojo susijungimo apkrovos grandinje schema Nustatyti, ar ~mogui gresia pavojus (ar avie ia aviesos diodas) ir iamatuoti prisilietimo /tampos vert: Ar ~mogui gresia pavojus? Prisilietimo /tampa UT ? Rezultatas: Tariamam ~mogui pavojus negresia, o prisilietimo /tampos vert lygi nuliui. Asmuo yra apsaugotas atskirian iuoju apsaugos transformatoriumi, kuris elektriakai atskiria abi (pirmin ir antrin) grandines. Svarbus dalykas yra tai, kad elektros tinklas nra sujungtas su ~eme. Taip asmuo nra susietas su tinklo /tampa ir nesusidaro u~daros srovs grandins. Dvi apkrovos sujungtos su atskirian iuoju apsaugos transformatoriumi `iame bandyme 2 apkrovos sujungtos su atskirian iuoju apsaugos transformatoriumi. Abiejose apkrovose pagal schem parodyt 3 pav. /vyko trumpasis susijungimas.  3 pav. Trumpojo susijungimo dviejs apkrovs grandinje schema 3 u~duotis Pakeisti 1 pav. schem, pagal 3 pav. pavaizduot trumpj/ susijungim /taiso apkrovos grandinje. Nustatyti, ar ~mogui gresia pavojus (ar avie ia aviesos diodas) ir iamatuoti prisilietimo /tampos vert: Ar ~mogui gresia pavojus? Prisilietimo /tampa UT ? Rezultatas: .tampa tarp dviejs apkrovs siekia 23V (230V). 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"r#899>:@:f<h<l<n<<<<<= $ & F a$ $5$7$8$H$a$ $5$7$8$H$a$$5$7$8$H$`a$$5$7$8$H$`a$$a$$`a$$7^7a$Esant aiam trumpajam susijungimui atskirian iojo apsaugos transformatoriaus darbas nesutrinka. Jis gali bkti aptiktas ir paaalintas reguliarisjs ap~ikrs metu. Jeigu tokios ap~ikros nevykdomos, tai ais gedimas gali tstis ilg laik, keldamas pavojs ~mogaus gyvybei. Todl bktina laikytis aios taisykls: atskiriantieji apsaugos transformatoriai naudojami tik su viena apkrova. Jeigu reikalinga prijungti kelet apkrovs tai gali bkti atlikta tik tuomet jeigu bus laikomasi specialisjs nurodymu. 4. Apkrova su dvigubu trumpuoju susijungimu Esant dvigubam trumpajam susijungimui galima ai situacija: maitinimo kabelis suspaustas tarp metalinis durs, pa~eista jo izoliacija ir vienas laidas susijungs su ~eme, o antrasis laidas susijungs su kilnojamosios lempos metaliniu gaubtu, kur/ lie ia ~mogus (~r. 4 pav.).  4 pav. Dvigubo trumpojo susijungimo schema 4 u~duotis Pakeisti 1 pav. schem, pagal 4 pav. pavaizduot dvigub trumpj/ susijungim /taiso apkrovos grandinje. Nustatyti, ar ~mogui gresia pavojus (ar avie ia aviesos diodas) ir iamatuoti prisilietimo /tampos vert: Ar ~mogui gresia pavojus? Prisilietimo /tampa UT ? Rezultatas: }mogs lie iant/ kilnojamosios lempos metalin/ gaubt veikia 23V (230V) /tampa ir jo gyvybei gresia didelis pavojus. `is pavyzdys rodo, kok/ pavojs kelia dvigubas trumpasis susijungimas. Todl elektros /taiss /zoliacija turi bkti reguliariai tikrinama, norint iavengti aio dvigubo trumpojo susijungimo sukelto pavojaus. Ekvipotencialiniai (vienodo potencialo) sujungimai Sujungimai, kurie suvienodina srovei laid~is dalis potencialus vadinami ekvipotencialiniais (vienodo potencialo) sujungimais. `ie sujungimai padeda iavengti dvigubo trumpojo susijungimo /taiso apkrovos grandinje ir su juo susijusio pavojaus. 5 u~duotis 1 pav. schemoje kilnojamosios lempos metalin/ gaubt sujungti su ~eme, paliekant 4 pav. pavaizduot dvigub trumpj/ susijungim /taiso apkrovos grandinje. Nustatyti, ar ~mogui gresia pavojus (ar avie ia aviesos diodas) ir iamatuoti prisilietimo /tampos vert: Ar ~mogui gresia pavojus? Prisilietimo /tampa UT U~raayti savo pastebjimus. Rezultatai: Jeigu schema sujungta teisingai, tai prisilietimo /tampa turi bkti lygi 0, todl, kad lempos metalinio gaubto ir ~ems potencialai yra vienodi. Automatinis fazinis iajungiklis L1 linijoje iajungia /tampa po kelis sekund~is. `is bandymas parod, kad ekvipotencialinis sujungimas (metalinio gaubto ir ~ems) padjo iavengti pavojaus dl dvigubo trumpojo susijungimo. Ekvipotencialiniai sujungimai bktini, dirbant ypatingai pavojingose patalpose, pavyzd~iui metalinis sijs konstrukcijose, laivs korpusuose, triumuose, katiluose, boileriuose ir panaa. Kabelis (pvz. tipo H07RN-F) skirtas ekvipotencialiniams sujungimams turi bkti kruopa iai paruoatas ir prijungtas iaorje, o jo skerspjkvio plotas turi bkti ne ma~esnis, kaip 4 mm2. Atskiriantysis apsaugos transformatorius turi bkti paliktas elektros srovei laid~ios darbo aplinkos iaorje. 5 pav. pateiktas pavyzdys, kuriame parodyta apsaugos transformatoriaus vieta ir vienodo potencialo sudarymas, prijungiant ekvipotencialinio sujungimo kabel/ tarp /renginio (elektrinio kilnojamojo gr~tuvo) ir srovei laid~ios aplinkos (boilerio), dirbant plieniniame boileryje.  5 pav. 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