Peb coj meej hwj chim rau lub ntiaj teb no

Yog vim li cas xav tau ib tug lub cev muaj zog tiv thaiv Circuit Court tej fais fab MPCB

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Yuav ua li cas yog: Sib Nqus lub cev muaj zog Circuit Court tej fais fab

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Cov Circuit Court tej fais fab tiv thaiv nroj tsuag ntawm luv luv circuits nyob rau hauv lub txwv ntawm lawv tawg peev xwm thiab los ntawm txoj kev nqus chiv (ib ib theem). Sib Nqus Circuit Court tawg yog tag nrho cov-ncej los ntawm cov nyuam: ib tug sib nqus txhais yuav ib txhij qhib tag nrho cov ncej.

Rau cov uas tsis luv luv-Circuit Court currents, Circuit Court tej fais fab ua hauj lwm sai tshaj fuses. Qhov no tiv thaiv raws li cov IEC 60947-2 txheem. Rau ib tug luv luv-Circuit Court tam sim no kom zoo, muaj peb imperatives:

·  Thaum Ntxov nrhiav kom tau ntawm lub faulty tam sim no,

·  Ceev ceev sib cais ntawm cov neeg,

·  Breakage ntawm lub luv luv-Circuit Court tam sim no.

AC motors - tiv thaiv tiv thaiv luv luv circuits

Txhua  electric tsav  muaj kev khiav hauj lwm txwv. Overshooting cov kev txwv no yuav nws thiaj li ua kom puas nws lub tshuab nws lub ntsiab, lub tam sim ntawd cov nyhuv ua kev khiav hauj lwm shutdown thiab losses. Ib tug luv luv Circuit Court yog ib tug ncaj qha kev tiv tauj ntawm ob lub ntsiab lus sib txawv ntawm cov hluav taws xob tej zaum:

- alternating tam sim no : theem-rau-theem kev sib cuag, theem-rau-nruab nrab kev sib cuag, theem-rau-av hu los yog hu rau ntawm windings nyob rau hauv ib theem,
- Direct current: contact between two poles or between the ground and the pole insulated from it.

Qhov no yuav muaj ib tug xov tooj ntawm cov ua: kev puas tsuaj rau lub kua roj vanish insulating lub conductors, xoob, tawg los yog stripped ntawm tej los yog cables, hlau txawv teb chaws lub cev, kev deposits (hmoov, ya raws, thiab lwm yam), seepage ntawm dej los yog lwm yam kev haus dej kom ntau, tsis ncaj ncees lawm thaiv nyob rau hauv los ua ke los yog txij nkawm.

Ib tug luv luv Circuit Court tau nyob rau hauv ib tug cia li surge ntawm tam sim no uas yuav ncav cuag ob peb puas lub sij hawm ua hauj lwm tam sim no tsis pub dhau milliseconds. Ib tug luv luv Circuit Court yuav muaj raug los thiab heev puas khoom. Nws yog typified los ntawm ob phenomena.

 

Thermal phenomenon

Ib tug thermal phenomenon coj mus rau lub zog tso rau hauv qhov hluav taws xob Circuit Court hla los ntawm lub luv luv Circuit Court tam sim no  kuv rau thaum lub sij hawm t raws li nyob rau hauv cov mis kuv 2 t thiab qhia raws li ib tug 2 s. Qhov no thermal nyhuv yuav ua rau:

·  Melting ntawm tus neeg xyuas pib hu,

·  Kev puas tsuaj ntawm lub cua sov ntsiab nyob rau hauv ib tug bimetal relay yog kev sib koom tes yog hom 1,

·  Cim ntawm hluav taws xob arcs,

·  Calcination ntawm insulating cov ntaub ntawv uas,

·  Hluav taws nyob rau hauv cov khoom siv.

·  fuses , uas ua txhaum lub Circuit Court los ntawm melting thiab yuav tsum tau hloov tom qab,

·  Nqus Circuit Court tej fais fab  uas tau ua txhaum lub Circuit Court thiab tsuas yuav tsum tau yuav tsum tau pib dua.

Luv-Circuit Court kev tiv thaiv muaj peev xwm kuj yuav ua tau rau hauv multifunction pab kiag li lawm xws li lub cev muaj zog pib kev tiv thaiv thiab contactor tej fais fab.

Txhais cov ntsiab lus thiab cov yam ntxwv

Lub ntsiab yam ntxwv ntawm luv luv-Circuit Court kev tiv thaiv pab kiag li lawm yog:

·  Rhuav muaj peev xwm : lub siab tshaj plaws nqi nyob rau hauv lub yees luv luv-Circuit Court tam sim no hais tias ib tug tiv thaiv ntaus ntawv yuav tawg ntawm ib tug muab voltage,

·  Kaw lub peev xwm : lub siab tshaj plaws nqi ib tug tiv thaiv ntaus ntawv yuav ncav cuag nyob rau ntawm nws nyob voltage nyob rau hauv kev cai tswjhwm tej yam kev mob. Lub kaw nqi yog k lub sij hawm so peev xwm raws li qhia nyob rau hauv lub rooj hauv qab no.

So peev xwm (BC)

φ cos

Kaw peev xwm (CC)

4.5kA <BC <6kA

0.7

1.5 BC

6kA <BC <10kA

0.5

1.7 BC

10kA <BC <20kA

0.3

2 BC

20kA <BC <50kA

0.25

2.1 BC

50kA <BC

0.2

2.2 BC

So thiab kaw daim ntawv Tuition Waiver rau Circuit Court tej fais fab los ntawm cov  IEC 60947-2 txheem

fuses

Fuses ua theem-by-theem (tib ncej) tiv thaiv nrog ib tug high school cov so peev xwm thaum uas tsis muaj volume. Lawv txwv I2t thiab electrodynamic kev nyuaj siab (Icrête).

Lawv yog mounted:

·  Nyob rau tshwj xeeb kev txhawb hu ua fuseholders,

·  Los yog nyob rau hauv isolators nyob rau hauv lub qhov chaw ntawm nyob thiab kev mus.

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Nco ntsoov tias txawv tebchaws qhia fuse cartridges yuav wired rau ib tug tag nrho-ncej switching ntaus ntawv (feem ntau yog lub cev muaj zog tswj contactor) los mus tiv thaiv singlephase lag luam thaum lawv yaj.

Lub fuses siv rau lub cev muaj zog tiv thaiv tej nyob rau hauv uas lawv cia los ntawm lub  overcurrents  vim lub magnetising tam sim no thaum motors yog switched. Lawv yog cov tsis haum rau kev tiv thaiv tiv thaiv overload (tsis zoo li gg fuses) thiaj li ib tug overload relay yuav tsum tau ntxiv rau cov lub cev muaj zog fais fab mov Circuit Court. Nyob rau hauv Feem ntau, lawv loj yuav tsum cia li saum toj no tag nrho cov load tam sim no ntawm lub cev muaj zog.


Post time: Aug-13-2018

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