Sounds like you have a fault.
We usually go out and locate the line and paint it.
We then use a fault locater.Isolate both ends,hook up one end to the fault locater voltage output,Adjustable up to 1700 volts.We have a meter with 2 insulated probes connected to it . we poke into to ground on top of the circuit. and follow the needle until we are right on top of the center signal.Dig down and walla,hole in cable. repair it with a heat shrink connector kit,and your ready to reconnect and energize. Works everytime.