Thaum xub thawj, lub chaw ua haujlwm fais fab muaj kev tsis txaus siab txog kev ua haujlwm ntawm cov khoom siv hluav taws xob sib xyaw, thiab tau ceev faj heev txog kev ua haujlwm hauv lub network, tsuas yog dai qee cov khoom sim ntawm cov kab tsis tseem ceeb nrog cov qib voltage qis dua 110 kV rau kev soj ntsuam nyob. Nyob rau hauv 1990, ib tug loj-scale muaj kuab paug flashover kev huam yuaj tshwm sim nyob rau hauv North Tuam Tshoj, thiab cov ntaub ntawv insulator soj ntsuam pom tau zoo heev pa phem flashover kuj, uas yog hlub los ntawm lub hwj chim ua hauj lwm chav tsev. Ntau lub tuam tsev tau pib siv cov thev naus laus zis tshiab no txhawm rau nthuav dav qhov ntsuas thiab kev ua haujlwm ntawm kev xyaum ua haujlwm, uas ua kom zoo dua cov pa phem flashover tiv thaiv ntawm cov kab sib kis thiab cov kab sib txuas, thiab txo cov kev ua haujlwm ntawm cov kab tu, yog li nws tau txais tos los ntawm lub zog ua haujlwm. . Tom qab ob peb xyoos ntawm kev ua haujlwm thiab kev ntsuam xyuas, lub zog hluav taws xob tau lees paub tias cov khoom siv hluav taws xob sib xyaw yog cov cuab yeej siv hluav taws xob tiv thaiv hluav taws xob tshiab, thiab tau pib siv cov hluav taws xob ntau dua 110 kV.