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First clarify what u mean by transient?
transmission Lines can be , underground cable or OHL conductors, in Qatar Electricity Transmission HV/EHV is by AC transmission ,in several countries long distance transmission is achieved by HVDC lines also .Energization /Transmission project commissioning, of FEEDERS/CABLE/OHL or SUBSTATION is a long procedure consisting of number of safety precautions and test acceptance process.
finally there is an over all stability test from remote end(Live ) to the upcoming commissioning end .
again final safety documents and various test results and healthiness reports are reviewed before energization /commissioning .
