Ingaba iMeneyitha yokuLahleka-kuKhuseleko lokuKhusela kuthetha ukuthini? (Icandelo 1)

Intshayelelo yoKhuseleko lweLass-of-Excitation Protection Generator loss-of-excitation protection luhlobo lokhuseleko lwe-generator relay. Ibhekisa kunyamalala ngequbuliso okanye inxenye yovuselelo lwejenereyitha. Xa ijenereyitha ilahlekelwa ngokupheleleyo yimincili, umsinga ochulumancisayo uya kubola ngokuthe chu ukuya ku-zero. Xa ixabiso le-δ ligqithise i-engile yozinzo olumileyo, umenzi wejenereyitha ulahlekelwa yi-synchronism kunye nenkqubo yamandla. Ngeli xesha, isixhobo sokukhusela i-generator sisebenza kwi-generator outlet circuit breaker ukukhupha i-generator kwi-grid yamandla, ukukhusela umonakalo kwi-generator kunye nokuqinisekisa ukusebenza okuzinzile kwegridi yamandla. Olu hlobo lokhuseleko lubizwa ngokuba lukhuseleko lokulahlekelwa yi-excitation.

Ngokuqhelekileyo, i-voltage relay isetyenziswa njengento yokuvala kwisekethe ye-rotor, kwaye i-impedance yokulinganisa imiselwe ngokwesangqa esibalulekileyo esingaphandle kwesinyathelo njengesiseko sesenzo. Umlinganiselo we-impedance kwi-terminal ye-generator iyona nto isisiseko sokukhusela i-generator-of-excitation protection. Xa zombini ikhrayitheriya yozinzo olumileyo kunye nekhrayitheriya yombane we-rotor ephantsi ihlangatyeziwe, oko kuthetha ukuba ijenereyitha ilahlekelwe yimincili kunye nokuzinza. Isixhobo sokukhusela i-generator siya kuthumela ngokukhawuleza isignali yokungazinzi, kwaye i-generator iya kunqunyulwa emva kwexesha lokulibaziseka elibekiwe.

Ikhrayitheriya yozinzo olumileyo inokuphinda isetyenziswe yodwa ukukhubeka kwijenereyitha. Xa i-voltage ye-rotor ephantsi idlula ixabiso elimiselweyo lokukhusela, isixhobo sokukhusela siya kuthumela isignali yokulahlekelwa kwe-excitation. Xa idlula kuluhlu lwesixhobo sokukhusela, isixhobo sokukhusela ijenereyitha siya kusinqumla ngoko nangoko isiphene. Lo mgaqo unokuqikelela ukuba ijenereyitha iya kulahlekelwa uzinzo ngenxa yokulahlekelwa yi-excitation, ukuze kuthathwe amanyathelo okwenziwa ngesandla ngaphambi kokuba i-generator ilahlekelwe uzinzo ukukhusela ingozi ekukhuliseni.

✽ Umzobo weSchematic weSixhobo soKhuseleko seGenereyitha-Ilahleko-yokuKhusela uKhuseleko

✽ Umgaqo woKhuseleko lweLahleko-yokuKhusela

Ukukhuselwa kokulahlekelwa kwe-excitation kuphendula ekusebenzeni kwe-asynchronous okubangelwa iziphene kwi-generator excitation circuit kwaye isebenzisa isangqa se-asynchronous impedance.

Ikhrayitheriya yesenzo yile:

Apho: I-U1 kunye ne-I1 yi-voltage yolandelelwano olulungileyo kunye nangoku ngokulandelelanayo, i-UN yi-voltage elinganisiweyo ye-generator (57.7V), oko kukuthi i-second current current ye-generator, i-Xd yixabiso leyunithi ye-generator ye-synchronous reactance, kwaye i-X'd yixabiso leyunithi ye-generator ye-react transient transient.

Ukuthembeka, i-criterion encedisayo yongezwa: U2 <0.1UN, apho i-UN i-voltage elinganisiweyo ye-generator (57.7V).

Ukhuseleko luya kuhamba kuphela xa zombini iinqobo zokugweba zifikelelwe. Ukukhuselwa kumiselwe imida emibini yexesha, enokuthi ibekwe ngokwahlukileyo. Ngokuqhelekileyo, umda wexesha lokuqala usetyenziselwa ukunciphisa amandla okuphuma kunye nokutshintshela kwi-excitation yogcino, kwaye umda wexesha lesibini usetyenziselwa ukukhupha i-generator kunye nokucima intsimi yamagnetic.

I-Block Diagram ye-Lass-of-Excitation Protection Principle

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