Koj paub dab tsi txog ZERO-SEQUENCE IMPEDANCE rau transformer

Zero-sequence impedance yog qhov tseem ceeb hauv kev ntsuas hluav taws xob, thiab nws tseem ceeb tshwj xeeb thaum txheeb xyuas qhov tsis sib xws. Transformers yog cov khoom tseem ceeb ntawm lub zog hluav taws xob, thiab lawv qhov zero-sequence impedance muaj kev cuam tshuam loj rau kev ua haujlwm ntawm lub zog. Zero-sequence tam sim no thiab voltage qhov tseem ceeb yog qhov tseem ceeb los muab kev tiv thaiv kev tiv thaiv ntawm cov kab hluav taws xob thiab cov khoom siv hluav taws xob. Zero-sequence kom muaj nuj nqis uas muaj qhov tseem ceeb feem ntau tshwm sim tsuas yog thaum lub zog hluav taws xob ua tsis sib npaug vim tsis muaj zog thauj khoom lossis vim yog qhov txhaum.

Transformers yog tsim los hloov hluav taws xob los ntawm ib qho hluav taws xob mus rau lwm qhov hluav taws xob. Thaum lub sij hawm tsis muaj kev sib npaug, xoom-ib ntus tam sim no raug ntxias hauv lub cev, thiab cov dej ntws tuaj yeem ncig hauv lub tshuab hloov pauv. Lub zero-sequence impedance ntawm lub transformer txiav txim siab qhov loj ntawm cov tam sim no thiab qhov tshwm sim voltage poob thoob plaws lub transformer.

Yog tias xoom-sequence impedance ntawm transformer yog tsawg, ces qhov ntws ntawm xoom-sequence tam sim no yuav siab, uas ua rau ib tug loj voltage poob nyob rau hauv lub transformer. Ntawm qhov tod tes, yog tias qhov zero-sequence impedance siab, ces qhov ntws ntawm xoom-sequence tam sim no yuav raug txwv, txwv qhov voltage poob hla lub transformer. Tsis tas li ntawd, tsis tshua muaj pes tsawg-ib theem impedance tuaj yeem ua rau saturation ntawm transformer core, uas tuaj yeem ua rau muaj kev puas tsuaj loj rau lub transformer.

Rau peb-theem fais fab system, xoom-sequence tam sim no ntws thaum ib los yog ob theem faulted rau hauv av. Kev ua haujlwm kom raug ntawm av relays yuav tsum muaj pes tsawg-sequence relay tam sim no thiab (rau kev taw qhia relays) polarizing kom muaj nuj nqis thaum lub sijhawm ua txhaum. Delta-wye transformers nrog grounded wye nruab nrab yog qhov tseem ceeb ntawm xoom sequence-tam sim no ntws nyob rau hauv lub hwj chim system. Nyob ntawm lub transformer tus configuration, xoom-sequence tam sim no yuav ntws los ntawm lub transformer, los ntawm lub transformer, los yog ob qho tib si.

Los piav txog xoom-qib impedance xeem ntawm lub transformer, ib tug grounded wye (qee zaum hu ua lub hnub qub configuration) kev twb kev txuas yog siv. Zigzag transformers raug kuaj rau xoom-sequence impedance los ntawm tib qhov kev sib txuas. Ntsuas qhov xoomIb theem impedance ntawm transformer yog yooj yim heev.Variation ntawm impedanceCov mis yuav tsum tau suav cov impedance rau zigzag lossis lwm yam grounding transformers.