Lokhu ikakhulukazi ukucabangela ukukhethwa kwesenzo sokuvikela i-transformer relay. Ukuvikelwa okusheshayo kwekhefu phezulu voltage uhlangothi lwe-transformer lusetshenziselwa ikakhulukazi ukuvikela amaphutha angaphandle we-transformer. Esilungiselelweni, uma umthamo omkhulu wesekethe emfushane usezingeni eliphansi voltage uhlangothi lwe-transformer alugwenywa, amanani wamanje wesifunda esifushane ebangeni elingekude ne-outlet ohlangothini lwe-voltage ephansi awashintshi kakhulu futhi ayafana ngokuyisisekelo, okuzokwandisa ububanzi bokuvikelwa kwekhefu okusheshayo ku-voltage ephezulu. uhlangothi lwe-transformer kuya kulayini ophumayo we-low-voltage, ngaleyo ndlela ulahlekelwa ukukhetha Ngemva kokulahlekelwa ukukhetha, ukuvikela kunokwethenjelwa kakhulu, kodwa kuletha ukuphazamiseka kwemvume. Isibonelo, amapaki amaningi ezimboni manje afakwe amagumbi okusabalalisa jikelele angu-10KV (amabha amabhasi angu-10KV+ama-breaker circuit aphumayo), futhi ishabhu ngayinye ifakwe amagumbi okusabalalisa amandla aphansi (ikhabhinethi yenethiwekhi eyindandatho+i-transformer). Uma i-circuit breaker ingaphunyuki umthamo omkhulu wesekethe emfishane ohlangothini lwe-voltage ephansi ye-transformer, izobangela ukuthi iswishi eyinhloko ene-voltage ephansi, (i-fuse yenethiwekhi yekhabhinethi yokulayisha ukulayisha), kanye ne-high-voltage circuit breaker ukuthi isebenze, okuzoletha ukuphazamiseka emsebenzini