To help visualize the workings of an electric fence, it helps to see it another way. Such a fence works like a table lamp, ceiling light or any other electric appliance that gets plugged in and is turned on and off with a switch. Your car battery has the same thing......a (+) post and a (-) post. To turn the lights on, you flip the switch.
In such a setting, there is a hot wire and a ground wire. The same exists with an electric fence. Hot wire (+) and ground wire (-). Except in this case, the animal is the switch. If it touches the hot wire while in contact with the ground (literally the ground upon which they stand), the current flows through and they get shocked. If they are climbing on a standard wire fence that is connected to the ground, such a fence will conduct electricity and works the same as if they were standing on the ground.
If the woven wire or other fence is nailed to wooden posts.....those do not conduct the juice all that well, so the shock would be reduced or eliminated. But if it is mounted on steel posts driven into the ground, it works well.
So if the woven wire is tied back to the ground, you can run hot wires alongside it and if the animal is climbing the woven wire, then touches the hot wire, they get zapped.
So goal is to run the hot wires very close to the woven wire, and as many strands as needed to make sure that any effort on their part to go up and over will always mean they touch a hot wire and get it.