Farko na Maimakon Tsakiyar Tashin Karamin Dabbobi
Himayar Da Duka Cikin Turbin
Turbin suna cikin muhimman komponantun da ke cikin masana'antu tauri. A nan da suka zama kalmomi, mutanen da suke maimaita, da kuma yawan lokaci na tururin mai gini, hukuncin da ke cikinsu ba suka faruwa sosai. Amma, wani abu da ya faruwa ne kuma yake iya haifar da matsaloli ga turbin. Saboda haka, bayyana turbin daga hukuncin da za su faruwa yana da muhimmanci sosai.
Hukuncin da ke cikin turbin suna faɗa da nau'o'in biyu: hukuncin da ke cikin waɗanda suka shiga da hukuncin da ke cikin waɗanda suka shiga. Hukuncin da ke cikin waɗanda suka shiga an yi amfani da tsarin relay wajen bincike don hana hukunci da zan iya haifar da turbin. Don hukuncin da ke cikin waɗanda suka shiga, ana amfani da tsarin himayar da duka.
Akwai tsari masu himayar da duka da ake amfani da su don inganta hukuncin da ke cikin fase da fase da kuma fase da kasa. Tsarin himayar da duka wajen turbin ta tauri tana nuna da amincewar da ake bayyana a cikin asusun Merz-Prize circulating current. Wannan himaya na iya amfani da shi don turbin da ake samun 2 MVA zuwa runshin.
Kwakwalwa Don Himayar Da Duka Cikin Turbin
Turbin ta tauri suna cikin star-connected da kusa da delta-connected. Current transformers (CTs) da ke cikin kusa da star-connected suna cikin delta-connected, amma wadanda ke cikin kusa da delta-connected suna cikin star-connected. Kafin da ke cikin star connection da current transformer da kuma power transformer suna zama ground.
An kawo kwallon restraining coil a kan kwallon secondary da ke cikin current transformers. Wannan kwallon restraining coil na iya rarrabe sensitiviti na system. An kawo kwallon operating coil a kan tapping point da ke cikin kwallon restraining coil da kuma star point da ke cikin kwallon secondary da ke cikin current transformers.
Ishiyar Tsarin Himayar Da Duka
A nan da yawa, kwallon operating carry ba da current saboda currents da ke cikin kusa biyu da ke cikin power transformer suka ci gaba. Amma, idan yana faruwa da hukuncin da ke cikin windings da ke cikin power transformer, wannan gaban ce yake buƙata. Bambanta, kwallon operating da ke cikin differential relay carry current da take daidai da farkon current da ke cikin kusa biyu da ke cikin transformer. Don haka, relay trippa main circuit breakers da ke cikin kusa biyu da ke cikin power transformer.
Abubuwan Da Ke Cikin Tsarin Himayar Da Duka
Idan ake sanya turbin, magnetizing current inrush transient ya fi sanya a cikinshi. Wannan current yana iya zama 10 times full-load current kuma ya ci gaba a lokacin. Wannan magnetizing current yana sanya a primary winding da ke cikin power transformer, wanda yake haifar da discrepancy a output da ke cikin current transformers. Wannan, a turn, zai iya haifar da tsarin himayar da duka cikin turbin ya yi aiki da hankali.
Don hana wannan abu, an kawo kick fuse a kan relay coil. Wannan fuses suna cikin time-limit type da inverse characteristic, kuma ba su yi aiki a lokacin da inrush surge yana ci gaba. Idan yana faruwa, fuses suka blow, tare da fault current zai sanya a kan relay coils da kuma activate protection system. Wannan abu na iya haifar da amfani da relay da inverse and definite minimum characteristic, ba instantaneous-type relay ba.
