Kev xaiv ntawm Tam sim no Transformer (CT) yuav tsum muaj kev ntsuam xyuas dav dav ntawm ntau yam, suav nrog cov kev ua haujlwm tiag tiag ntawm lub zog hluav taws xob, kev ntsuas tshwj xeeb lossis kev tiv thaiv, thiab ib puag ncig kev teeb tsa. Lub hom phiaj tseem ceeb yog los xyuas kom meej qhov ntsuas qhov tseeb thiab kev tiv thaiv kev ntseeg tau.
The first step is to determine the rated primary current and the transformation ratio. Feem ntau, CT qhov ntsuas qhov tseem ceeb tam sim no raug xaiv raws li qhov siab tshaj plaws thauj khoom tam sim no ntawm txoj kab, thaum suav nrog cov npoo kev nyab xeeb txaus los tiv thaiv kev ua haujlwm ntev nyob rau hauv cov xwm txheej overload. Common transformation ratios include 200/5A, 500/5A, and 1000/5A. Qhov zoo tshaj plaws, qhov kev khiav hauj lwm tam sim no yuav tsum poob rau hauv thaj tsam ntawm 60% mus rau 80% ntawm tus nqi ntsuas los lav qhov ntsuas qhov tseeb thiab kev ntseeg tau ntawm kev tiv thaiv kev ua haujlwm.
Qhov thib ob, nws yog ib qho tseem ceeb uas yuav tsum xav txog qhov tseeb hauv chav kawm thiab nws txoj kev sib raug zoo nrog rau daim ntawv thov. CTs siv rau kev ntsuas hluav taws xob feem ntau xav tau qhov tseeb siab- xws li cov chav kawm 0.2S lossis 0.5- kom txo qhov kev ntsuas qhov yuam kev. Hloov pauv, CTs ua haujlwm rau kev tiv thaiv relay ua qhov tseem ceeb hauv qhov kev ua txhaum tam sim no thiab cov yam ntxwv tsis txaus; yog li ntawd, cov chav kawm tiv thaiv xws li 5P lossis 10P feem ntau xaiv. Furthermore, attention must be paid to the rated burden (VA value) to ensure that the load on the secondary circuit does not exceed the CT's permissible limits.
Thaum kawg, luv luv -lub sij hawm thermal thiab dynamic stability muaj peev xwm, nrog rau kev teeb tsa, yuav tsum tau hais txog. CT yuav tsum muaj peev xwm tiv taus qhov cuam tshuam ntawm qhov system luv -circuit tam sim no; Yog li ntawd, nws yog ib qho tsim nyog los xyuas kom meej tias nws cov thermal stability tam sim no thiab dynamic stability tam sim no ntsuam xyuas tau raws li qhov yuav tsum tau ua. Tsis tas li ntawd, cov txheej txheem xaiv yuav tsum coj mus rau hauv tus account lub mounting txoj kev (xws li, qhov rais-type, post-type, busbar-type), rwb thaiv tsev chav kawm ntawv, ambient kub, thiab altitude tej yam kev mob kom muaj kev ruaj ntseg thiab txhim khu kev qha ntev - lub sij hawm ua hauj lwm.
