Usoro mgbako ihe mgbawa sekit ugbu a

Buru ụzọ gbakọọ ngụkọta ike P nke ngwa eletriki niile, na ngụkọ nke ngụkọta ugbu a nọmba I = P / U,mgba ọkụ ntapukwesịrị ịdị ukwuu karịa ngụkọta ugbu a, a ga-enwerịrị akụkụ ụfọdụ, ma ọ bụ na ntinye nke ngwa eletriki ndị ọzọ agaghị enwe ike iguzogide.Mwepu ntapu ugbu a ezinụlọ 30MA nwere ike.Mgbanwe ntapubụ n'ozuzu bụghị ibufe ọrụ nchebe, ma ọ bụrụ na ị chọrọ iji chebe akara ka obere sekit breaker, obere sekit breaker enweghị ike họrọ oke ibu.N'ozuzu, a na-eji ụdị C.

Obere sekit breakerjiri usoro ngụkọ dị mfe nke nwere ụfọdụ njehie na-adabaghị nke ukwuu ma nwee ike ịnakwere na injinia:

(1) maka 10/0.4kV voltaji ọkwa nkeobere eriri sekit, nwere ike ịtụle elu voltaji n'akụkụ nke obere sekit ikike bụ enweghi ngwụcha (10KV n'akụkụ nke obere sekit ikike bụ n'ozuzu 200 ~ 400MVA ma ọ bụ ọbụna ukwuu, otú dị ka enweghi ngwụcha na-atụle, njehie bụ ihe na-erughị 10%).

(2) Gb50054-95 "Usoro nhazi nkesa nkesa ike dị ala" 2.1.2 ndokwa: "Mgbe nchikota nke ugbu a nke moto ejikọrọ n'akụkụ ebe dị mkpirikpi gafere 1% nke oge dị mkpirikpi, mmetụta ahụ. nke nzaghachi moto ugbu a kwesịrị ịgụnye.Ọ bụrụ na mkpirisi okirikiri dị ugbu a bụ 30KA, were 1% nke ya, nke kwesịrị ịbụ 300A.Ngụkọta ike nke moto bụ ihe dịka 150KW, ma mgbe ọ malitere n'otu oge ahụ, nzaghachi ugbu a gụnyere kwesịrị ịbụ 6.5 ∑ In.

(3) voltaji impedance UK nke mini-circuit breaker na-anọchi anya sekit mkpirisi n'akụkụ (okirikiri), mgbe akụkụ ruru ya gosiri ugbu a, mbụ n'akụkụ voltaji bụ narị isi uru nke ya gosiri voltaji.Ya mere, mgbe isi voltaji bụ voltaji e gosiri, nke abụọ ugbu a bụ nke a na-atụ anya ya dị mkpirikpi oge.

(4) Obere akụkụ nke mgbawa sekit gosiri ugbu a It=Ste/1.732U Ste bụ ike nke obere sekit breaker (KVA), Ue bụ obere akụkụ nke gosiri voltaji (no-load voltaji), Ue = 0.4kV mgbe 10 / 0.4kV, ya mere, akụkụ nke abụọ e depụtara ugbu a nke mini-circuit breaker kwesịrị gbakọọ nanị dị ka ike nke mini-circuit breaker X1.44 ~ 1.50.

(5) Dị ka nkọwa nke Uk na (3), mkpirisi mkpirisi nke ugbu a nke akụkụ inyeaka (mkpirisi okirikiri nke atọ) bụ nkọwa nke I (3) maka Uk, na mkpirisi okirikiri nke ugbu a akụkụ inyeaka (mkpirisi mkpirisi nkeji atọ) bụ I(3)=Ite/Uk, nke bụ uru bara uru nke AC.

(6) N'okpuru otumini-circuit breakerikike, ọ bụrụ na enwere obere sekit n'etiti akụkụ abụọ ahụ, mgbe ahụ I (2) = 1.732I (3) / 2 = 0.866I (3)

Ngụkọta nke dị n'elu bụ uru dị ugbu a nke obere sekit dị na ntinye nke obere sekit nke obere ihe, nke bụ ihe mberede sekit kacha njọ.Ọ bụrụ na enwere ebe dị anya n'etiti ebe dị mkpirikpi na obere ihe mgbawa, tụlee ihe mgbochi ahịrị.