Mune hombe mafambiro system, kuitira kuti isangane nezvinodiwa zve relay kuchengetedza senitivity coordination, chikamu cheiyo main transformer inofanirwa kuve. akadzika, uye rumwe rutivi haruna kudzika.

Kana mapoinzi maviri evasina kwavakarerekera evashanduri vakuru muchiteshi chimwe asina kudzika pasi panguva imwe chete, chinonyanya kutariswa ndiko kurongeka kwe zero-sequence. mafambiro uye zero-sequence voltage kudzivirira.

A substation ine akawanda ma transformer anomhanya achienderana anowanzo atora nzira iyo isina kwayakarerekera poindi yeimwe transformer inodzika, nepo iyo isina kwayakarerekera yeimwe chikamu cheshanduko haina kudzika. Nenzira iyi, chiyero chepasi chazvino chinogona kuganhurirwa mukati mechikamu chinonzwisisika, uye panguva imwe chete, ukuru uye nhanho-ne-nhanho mamiriro e zero-kutevedzana ikozvino kweiyo gidhi remagetsi haizokanganiswi nekuchinja mune. iyo maitiro ekushanda zvakanyanya sezvinobvira, uye kunzwisiswa kwe zero-sequence yekudzivirira ikozvino kwegadziriro inovandudzwa.