Poor Grounding Ntawm Distribution Transformer

Kev tiv thaiv xob laim ua haujlwm rau kev faib hluav taws xob cuam tshuam los ntawm xob laim hluav taws xob feem ntau tau ua tiav, tab sis tseem muaj ob qhov teeb meem: ① tsis zoo hauv av ntawm xob laim ntes; ② Tsuas yog hais txog kev teeb tsa hluav taws xob ntawm sab hluav taws xob siab thiab tsis saib xyuas qhov teeb meem ntawm kev teeb tsa xob laim rau sab qis (tshwj xeeb tshaj yog nyob rau thaj chaw uas muaj hluav taws xob ntau zaus). Yog hais tias lub hauv paus ntawm lub teeb ntes hluav taws xob tsis zoo thiab overvoltage tshwm sim, lub teeb ntes hluav taws xob tsis tuaj yeem tso tawm qhov dej tam sim no, uas yuav ua rau lub rwb thaiv tsev ntawm lub transformer puas; Yog hais tias lub teeb ntes hluav taws xob tsis tau nruab rau ntawm qhov qis-voltage, thaum muaj ntau qhov hluav taws xob tam sim no tawm mus rau hauv av los ntawm high-voltage sab xob laim ntes, qhov hluav taws xob poob yog tsim los ntawm qhov chaw hauv av. Qhov hluav taws xob no tseem ua rau ntawm qhov nruab nrab ntawm qhov qis-voltage sab winding thaum dhau los ntawm lub transformer casing, thiab qhov qis-voltage sab winding yog grounded los ntawm yoj impedance ntawm cov kab qis-voltage. Cov kev ntsuas hauv qab no tuaj yeem ua tau
① Txheeb xyuas qhov teeb meem hauv av uas cuam tshuam nrog tus ntes xob laim thiab rov txuas lawv raws li qhov xav tau. Nco ntsoov tias txoj hlua hluav taws xob hauv av yuav tsum tau txuas ncaj qha mus rau lub plhaub ntawm lub transformer thiab qhov nruab nrab ntawm qhov qis-voltage sab, thiab tom qab ntawd cov khoom siv hauv av yuav tsum tau sib koom. Nws cov av tiv thaiv yuav tsum tsis pub tshaj 4 Ω; ② Rau cov cheeb tsam uas muaj cua daj cua dub ntau, yuav tsum tau ntxiv cov hluav taws xob qis hluav taws xob rau sab qis.