Steve, I don't know if you read what I wrote on page 1. I did state that since the drone isn't grounded, hitting one phase won't cause a major problem.
But, a bird does not have the length of a Phantom. A Phantom can indeed cause a phase to phase short, especially on distribution lines, which phase to phase is normally 12KV. Phase to ground is 7.2KV as you stated.
Squirrels often cause these fuses to blow as around the pole mounted transformer, the phases are close together. The transformer is the large grey, round object. The fuse is the rod hanging down with a metal ring on its end. This fus has been opened manually. The distribution folks use a long fiberglass stick that has a metal piece that goes into that ring and the fuse can be opened, killing power to the homes feed by that transformer.
The 'thingy' with the rings, is a ceramic insulator. When a fuse blows, there is a part that hangs out, which indicates it was blown. Notice the two grey large PVC caps. This is there to prevent squirrels from making the fuse blow. A crew has to be sent out to determine the problem. They have get into a bucket, on a bucket truck to replace the fuse.
If your Phantom lands between two phases, not downstream from the fuse, another fuse upstream will not blow as there isn't one. The protection comes from a very large breaker. (Think 8' high and a 5' wide cabinet. The actual breaker for those phases, is about 5 to 6 feet in diameter.
Over current and differential relays will sense the extra current and the breaker will trip, cutting power to the distribution line. If a phase to ground or a phase to phase 'short' occurs, the over current relay will trip. These are not standard relays. they are about 8" wide and 10" tall, with very elaborate functions that have to be set by an engineer, such as myself.
Consider your Phantom causes this and a breaker trips instead of a fuse blowing. If after hours, the on-call Transmission Center engineer will be called out. Perhaps me. I drive to the substation and after checking for squirrels, snakes, a regulator problem etc., then using a fiberglass pole, I will manually disconnect that 12KV breaker.
A distribution crew is called out after I report that the problem is downstream. The crew drives and walks the entire distribution lines in search of a problem, ranging from animals, trees, tree branches, kids throwing metal chains across the phases or your Phantom. To remove it, they have to switch that sesction of line off, then they install ground wires that clamp to the phases. Why? Because electricity can be induced into the lines, when the lines run near energized lines. Also, because our slogan is safety first.
Another factors are generators. If not hooked up with relays that separate the generators output to the wires going to your electrical box, then the pole mounted transformer will work in reverse. Your 115VAC will be transformed to either 7.2KV or 12KV determining on how you wired it.
Men have been killed by generators, or if they are lucky they will lose an arm and/or legs if they are lucky. Through such tragedies, safey procedures are added. The lawsuit by my electrical company and the family will make you broke, forever.
Once the problem has been eliminated, I will connect the breaker and after radio contact and I determine that everyone is clear, I will close the breaker. I didn't get paid for being called out in the middle of the night. I was also called out if an entire town or towns were without power. I had to make the decision whether to re-energize a $250,000 or $1, 000,000 transformer. If I made the wrong decision, the company would be ou that money.
Allow me one more look back into my career. I went to work on a computerized system that allowed remote control over all devices, alarms and stays of all devices, as in open or closed. When leaving, I walked up to a regulator (8 feet high and maybe 5' in diameter.) and I put my hand on it. I did so because the maintenance crew replaced it a week ago. It wasn't running hot, so I locked the gate and left.
The dive store, which I taught SCUBA diving from, was nearby. I stopped in to see how many students had signed up. Immediately, I was paged. I called and and I was told the substation that I just left, was on fire. I drove there, got past the police and the fire department was at work. What happened is that regulator, that I touched, literally blew up.
It had to happen within a mi ute of my leaving. These are full of oil, as a dielectric and a cooling agent. The regulator exploded and the oil ignited. I was one minute away from death, if that long. This was my first brush with death. The second time is another long boring story. I came even closer to death.
What I tried to say is to simply stay away from all electric wires. I hope that I made that point as I want to prevent deaths and lawsuits against my friends here. Can I get an amen??