Aretẹlẹ ti oluyipada ti ara

Awọn oluyipada ti ara rẹ, tun mo bi iyipada ilẹ, jẹ iru oluyipada oluyipada aini ni mẹta-}} fa awọn eto agbara ina. O ti wa ni deede gba oojọ ni awọn eto agbara laisi didoju agbara ti o ni didoju-ara lati pese asopọ kekere atọwọda, sporor, tabi ni idiwọ ẹri. During line - to - ground faults, it offers a low - impedance path for zero - sequence fault currents (while presenting high impedance to positive and negative sequence currents), limiting fault currents and transient overvoltages to ensure reliable operation of the grounding protection system; Pẹlupẹlu, o ṣe nfun kukuru nigbagbogbo {{{{{o kukuru titi di fifọ Circuit ṣe yọ ẹbi naa han, nitorinaa ni kukuru} Bẹẹda awọn iwọn. The kVA rating of an earthing transformer depends on the normal line - to - neutral voltage and the fault current value within a specified time, such as seconds to minutes. Additionally, it may adopt a secondary (low - voltage) winding to continuously supply power to substation stations, and enables delta - connected three - phase systems to accommodate phase - to - neutral loads by providing a return path for current to the neutral; during single - phase faults, it limits the fault current in the neutral to improve power line restoration.

Afikun awọn akọsilẹ lori iṣiṣẹ ati be be

• EtoPipa
• Iṣiṣe deede: Iyọ-ọrọ lọwọlọwọ ṣiṣan nipasẹ ẹgbẹ akọkọ ti gbigbele; Ẹgbẹ keji (ti o ba wa lọwọlọwọ) ko ni lọwọlọwọ.
• Nikan - ► Tẹ aiṣedeede KokoPipa By properly selecting the current-limiting impedance Z, the per-phase short-circuit current can be controlled to not exceed the rated phase current of the main transformer windings. Iwọn wiwọn ti iru kukuru si iru awọn ọjọ 8}} Circuit lọwọlọwọ jẹ 10 aaya.

Ni isẹ deede, lilọ kiri ni fifẹ ti iyipada wiwo ni asopọ pọ si awọn oluṣe alakoso ti eto itanna, lakoko ti o ti wa ni ilẹ keji. Ni akoko yii, oluyipada ṣiṣẹ bi ibojuwo irinwo, fifa folitigbọsi oke tabi isalẹ gẹgẹ bi awọn ibeere.

Fun ifisonu awọn iṣan okẹjẹ, iyọrisi ti gbigbe ara rẹ, pẹlu eyikeyi awọn alaworan ilẹ, pẹlu afikun awọn ohun titobi ti awọn iṣan idaamu ti nṣàn nipasẹ eto. Nipa ṣiṣakoso awọn iṣan agbara ẹbi wọnyi, ẹrọ oluyipada ikogun ṣe iranlọwọ lati ṣetọju iduroṣinṣin eto ati aabo ti o ni imọlara lati ibajẹ.

When a fault (such as a line-to-ground fault) arises in the system, fault currents flow through the secondary winding of the earthing transformer to the ground. Eyi ṣẹda kekere kan kekere - ►}

Ni awọn ofin ti ailewu ati aabo, ẹrọ oluyipada ti iṣan ensource ati ẹrọ ninu eto itanna nipa pese ọna igbẹkẹle kan si ilẹ. O ṣe iranlọwọ lati yago fun awọn iyalẹnu itanna, ina, ati awọn ewu miiran ti o ni nkan ṣe pẹlu awọn ipo ẹbi, bayi ni idasi si agbegbe iṣẹ ailewu ati igbẹkẹle eto imudarasi.

Awoyi earthhing jẹ ohun elo itanna pataki ti a dagbasoke lati koju aini aini didoju pataki ni awọn atunto aabo agbara kan ati rii daju pe iṣẹ ailewu ti o waye. Awọn iṣẹ rẹ Atijọ ati awọn abuda ṣiṣẹ ni a tan tan kaakiri ninu awọn aaye wọnyi:

Iṣeduro didojuwọn akiyesi lailewu ni awọn alailanfani marun ti o tẹle:

• Awọn ibeere idabobo giga ati idiyele: When a single-phase grounding fault happens, the voltage of the non-fault phase increases by √3 times. Bi abajade, awọn ohun elo itanna ninu eto agbara nilo lati ni ipin idabobo ti o ga julọ, eyiti o n gbe iṣẹ iṣelọpọ mejeeji ati idiyele itọju atẹle ti ẹrọ.
• Ewu ti Arc Ibi Ilẹ: Ti o ba jẹ pe nikan {0} onibaje ti yi, AC yoo parun, AC yoo parun nigbati o ba kọja ni odo, ati ẹbi yoo parẹ. Sibẹsibẹ, nigbati isisoke ju awọn amperes 30 lọ, apa ti iduroṣinṣin yoo jẹ ipilẹṣẹ, lara gbigbe ti agbejade ti o tẹsiwaju. Eyi kii ṣe awọn ohun elo bama jẹ ṣugbọn o tun jẹ ki awọn meji {{O si tun mu ki o si 4}} alakoso tabi paapaa mẹta {{5} onipo.
• Iṣoro ni yiyan aabo gbigbe gbigbe gbigbe: O nira lati mọ aabo ti o ni imọlara ati aabo yiyan. Paapa fun awọn akopọ agbara pẹlu awọn okun alailera ti Arc, Iṣeto ati iṣẹ deede ti iru idaabobo bẹẹ jẹ irọrun ti akoko ati ipinya ti awọn aṣiṣe.
• Gege ko le fa resonace apọju: Awọn iṣe bii fifọ okun waya, awọn iṣẹ yiyipada ti awọn akoko oriṣiriṣi, ati fiuse munu ni awọn akoko oriṣiriṣi le yori si marvolace. Overvoltage yii le fa ina mọnamọna Arerest Constea, yiyipada alakoso ti awọn oluyipada fifuye, ati filasi flacul ti awọn ohun elo itanna.
• Resolation sudvoltage ti ẹrọ oluyipada folti itanna: Nitori naa pe àpẹrẹ ti awọn oju-aye gritrate agbara, dibọn ayidayiya nigbagbogbo, eyiti o fẹ fer -llin ti o ga julọ -} Iru inu ẹrọ nigbagbogbo ti oluyipada folti folti ti itanna. Ni awọn ọran ti o lagbara, o le jo paapaa awọn oluyipada naa funrararẹ.

• Oludasile ipese agbara giga: Iyipada kekere ni mẹta {0} onitosi ori ẹrọ / tunun nigbakan awọn aṣiṣe; Ko si tppinpinte lẹsẹkẹsẹ, pẹlu awọn aṣiṣe ti a mọ laarin awọn wakati ~ 2, aridaju agbara tẹsiwaju.
• Adirẹsi kekere si ibaraẹnisọrọ / awọn ọna ami ami: talaka: ailagbara elekitiro labẹ mẹta {{0} Išẹ iṣiṣẹ; Igbẹhin kekere ti o wa lọwọlọwọ fa ipa kekere; ARCs Ara-ara -}} oniyipada ni awọn ọna kekere (fun apẹẹrẹ, awọn ẹwọn igberiko).
• Rọpọ Wiwa ẹbi & Ipo: Iyatọ ti iṣakojọpọ kekere ti o lọwọlọwọ ṣe iranlọwọ fun awọn ẹrọ aabo ati wa awọn aṣiṣe.
• Dinku ibeere fun lọwọlọwọ- ► Dipo awọn ẹrọ Lilọ kiri Awọn iwulo fun titobi nla, gige awọn ere, gige apẹrẹ.
• Iṣakoso apọju ti o dara julọ ni awọn oju iṣẹlẹ kan: rọrun lati ṣakoso awọn iyipada folti lakoko deede / awọn ilana titan, fifa awọn eewu ibajẹ.
• Ṣe idaniloju iduroṣinṣin leto ipo: rọrun lati ṣetọju mẹta- Diews awọn ifiṣẹ, dida awọn ipa pataki ati yago fun awọn ọran pataki.