He aha te mea whakahāwea? Tātaitanga o te selectivity o tuatea iahiko

Na roto i te selectivity tikanga o hinu tikanga o te tiaki o hiko pūrere iahiko. Ka rite ki te hua o fuses ranei tuatea iahiko haukotia te me kawenga kore ngingiha waea hono ki reira e ara iahiko poto me exceedances faaroo i ngā pae tīpakohia, ka tonu te toenga o te ara iahiko ki te mahi.

Scheme o automata

Ko te ariā e taea te whiwhi taua selectivity mā te whakaaro i te kaupapa o te rōpū hiko kāinga.

Ki te kia mahi i te taiawhio poto i roto i te kīhini atu ruma ranei kotahi anake taputapu paruru e pā ana ki te mekameka. i runga i te urunga aunoa kore e tahuri atu, a ka kawe hiko ki te toe wāhanga. Ki te kore hoki tetahi take i mahi i te pana mo te kīhini, na ka whakahaere i te raruraru te tomokanga aunoa i tahuri atu te mana mō ngā ara iahiko katoa.

whakarōpū

He aha te mea te selectivity o te mīhini, ka taea te māngai reira i roto i te puka o ratou kohikohinga, me ngā hoahoa waea.

1. Whakaoti. A, no te koe mekameka daisy whakaaro maha i runga i overcurrent tauhohe te tetahi e ko tata ki te rohe whawhati tata.
2. Motunga. Ko rite ki te tonu te tiaki, engari ko reira whai hua anake ki runga ki te nui etahi o overcurrent.
3. Rangitahi. A, no te e hono ngā pūrere i roto i te raupapa ki te āhuatanga o nāianei taua whakaturia roa te wā rerekē i runga i te mahi o tona hua āta i te wahi ki te arā noa te pūtake mana. mīhini Time whakahāwea whakamahia mo te whakaaro tutaki ia atu i te tere whakaweto. Hei tauira: ko te tuatahi rongo te i muri i 0.1 hēkona, te tuarua - 0.5 hēkona, te tuatoru - 1 hekona.
4. O nāianei. Selectivity wā rite tawhā anake ko te cutoff nāianei mōrahi. E tīpakohia Pūrere i te aronga o te whakaiti i te setpoint i te puna mana ki nga taonga kawenga (hei tauira, 25 A ki te tāuru, me te ake ki te putanga 16 A me te 10 A - ki te rama).
5. Time-o nāianei. Ko te mīhini whakaratohia hoki he tauhohenga ki te nāianei, me te - te wā. E wehea mihini ki ngā rōpū A, B, C, D. whakarite ratou wa selectivity i tetahi he (ara iahiko poto) he uaua no te mea kei te superimposed nga āhuatanga o ngā pūrere i runga i tetahi i tetahi. tutuki te pānga paruru mōrahi e i roto i te rōpū A, arā te nei whakamahia mō te iahiko hiko. Ko te pūrere tino noa momo C, engari whakaarokore ki hea, me te kore e tūtohutia ratou. tono Rōpū D te ki te pūnaha puku ki ngā inrush nui.
6. Rohe. Ko te mahi o te kōwae aroturuki ruri mana supply. A, no te he paepae setpoint (uara paepae tomu'a), tuku raraunga ki te pokapū mana, tīpakohia nei mo te whakaweto aunoa. Ko te tikanga e whakamahia ana i roto i te ahumahi, no te he uaua, utu, me te rapu utu kai mana motuhake. He whakamahia putanga hiko: ka tukua ka kitea he he i te mīhini awa he tohu ki whakarunga me te kotahi tīmata ki te tatau i te wā wa ko āhua 50 ms. Ki te kei raro te whakakā i roto i tenei wa e kore e mahi i te reira, tahuri ki runga ki taua, kei nei i runga ake i te mekameka.
7. Energy. Mīhini i te tere tiketike, ai kore e te nāianei poto-iahiko i te wā ki te tae te mōrahi.

Puka o te whakahāweatanga

Kei te wehea selectivity Protection ki tūturu ranei whanaunga, i runga i nei e monokia pae. Hoki te take tuatahi ko te keu tino pono fuses te wāhanga pakaru o te ara iahiko. I roto i te rua o nga mihini momotu kei runga ake, ki te kore e mahi tiaki i raro nei mo te ngā take.

tepu selectivity

mahi tiaki tīpakopako te nuinga, no te nui rawa i te kaiwahi i haaati iti ahau _n, t. E. I pokatata iti. A, no te ki te poto-takatakanga whakatutuki ona nui atu uaua. Ki tenei mutunga, hoko kaiwhakanao hua ki te papa o te selectivity, ki e taea e koe te hanga i paihere ki hīrau whiriwhiri. Here taea e koe te tīpako i te rōpū o ngā pūrere o tetahi anake kaiwhakanao. selectivity o te tepu aroaro raro, ka taea e kitea e koe a ratou ano i runga i nga tukutuku o kamupene.

Hei whakamātau i selectivity i waenganui i te whakarunga me te taputapu awa ko te whakawhitinga o te rarangi me te tīwae, te wahi "t" - he selectivity katoa, me te tokomaha - wāhanga (ki te he iti iho i te uara i tohua i roto i te tepu tetahi he o nāianei).

mihini te tātai selectivity

Kei te nuinga ngā pūrere tiaki whakamahia i roto i whakakā tikanga, te selectivity o e te mea tika ki te whakarite i te kōwhiringa tika me ngā tautuhinga. Ratou mahi whiriwhiri mō te tiaki tāuta ofi ki te supply mana e whakaratohia e te huru e whai ake nei.

• _s.o.posled ahau ≥ K _nd ∙ ahau _k.pred. Kei hea:
  - _s.o.posled ahau - te nāianei i i whakahohe te tiaki te;
  - e ahau _k.pred. - tiaki poto-iahiko i te mutunga o te awhe, kei i te tawhiti nui i te pūtake kaha;
  - K _nd - tika tau whakarea i tei runga i te tawhā titaritari ana.

He aha te selectivity i te wa, kua kite te ture o mihini reira i te pā ana i raro nei.

• _{s.o.posled k.pred} t ≥ _t. + Δt, te wahi:
  - t a t _{s.o.posled k.pred.} - te wā wā i nei tīmata nga mihini tapahia-atu, aua, e tata ana a mamao i te pūtake kaha;
  - Δt - wā atamira selectivity, putumōhio selectable.

kanohi kauwhata o te selectivity

Hoki pono waea tiaki overcurrent Me te selectivity kāri. tohu te reira i te āhuatanga o te whakaaro iahiko tāuta hokohoko ena i roto i te mekameka wa-o nāianei. whiriwhiri te tauine e na taua i runga i te ngā rohe ki te kia kitea nga āhuatanga tiaki o nga whakaaro. I roto i te mahi, te selectivity o nga kaupapa kāri pai io kore whakamahia, i te mea he ngoikoretanga nui, me te arata'i ki te hiko kaiwhakamahi.

kia ōwehenga iti i te iti rawa 2.5 mo selectivity. Otiia ara to ratou he wāhi mahi noa, ahakoa iti. Anake i te ōwehenga o 3.2 te kitea, ratou pūtahitanga. Otiia i roto i tenei take kotahi o te mau faaroo e taea kia rimurapa me Me ki te tāuta i muri i te waea aunoa o nui-wāhanga ripeka.

I roto i te nuinga o te wā, e kore e te selectivity o te tiaki e hiahiatia ana. E mea titauhia anake te wahi i reira e taea e ngaahi nunua mamafa.

Ki te whiwhi te uara tatau faaroo rimurapa automata i runga i tāuru whakaturia tuatea iahiko whakakā kawenga ranei.

Ka taea hoki te tono mihini motuhake whiriwhiri.

Whiriwhiri S750DR aunoa

ABB manufactures hua tohu S750DR, te wahi whakaratohia te selectivity o whakakā e te atu o nāianei e kore e nei i whakawāteatia i muri i te whakawhitinga whakapā matua i roto i te ara iahiko poto.

A, no te motu i te pae tata i hanga awa whakapā bimetallic whiriwhiri e te wa roa whakautu. Ko te kupu te whakakā taketake tīpakongia hoki ki wahi i mahi puna whakapā. Ki te haere tonu te mo-nāianei ki rere i roto i te ms 20-200 momotuhia tiaki waiariki i roto i ara iahiko matua me te tāpiri. Ko te kupu whiriwhiri Unuhia bimetallic poraka disengaging tikanga, me te kore e te puna e taea ki te kati hoki ki te whakapā matua.

Whāiti mīhini nāianei whakaratohia e tīpakongia parenga 0.5 ohms o resistance me te arcing nui roto te taputapu.

mutunga

He aha te mea te selectivity, e mea ohie ki te mahino ka whakaaro te iahiko hiko ki hononga raupapa o mihini. E ngāwari ratou ki te tiki ake, ki te whakarato i hīrau whiriwhiri i runga i kikī. Fifi puta ka nui ngā poto-iahiko. Hoki tenei whakaaro maha ngā tikanga, me te mihini motuhake ABB, te hanga i te roa i roto i te wa whakahohenga.