What makes you say there isn't? What is your threshold for "strong" and at what distance from the wires are you measuring?
The formula for the magnetic field of a long straight wire is:
B = (2 x 10^-7)I/d
http://www.ac.wwu.edu/~vawter/PhysicsNet…
For a given power, the higher the voltage, the lower the current and the lower the losses due to resistance in the wires. Therefore power companies like to use the highest voltages they can.
http://en.wikipedia.org/wiki/Electric_po…
Still, when a power line is transmitting 100MW of power, then even though the voltage is on the order of 100KV, we are still talking about 1000 amperes of current.
An extreme case is the Pacific DC Intertie: 3,100MW at 500KV for a current of about 6000 amps.
http://en.wikipedia.org/wiki/Pacific_DC_…
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