30m (~100ft) of 14AWG would have a resistance of around 0.8 Ohms.
If you put 200 Amps through that length of cable, it would drop 160V and dissipate over 25,000 Watts!
(And rapidly become incandescent & disintegrate).
You would need to go to somewhere between 2 AWG and 00 AWG for the cable to stand 166A continuously, depending on the exact type.
At 2 AWG the cable resistance would be around 32 milliohms, so you would loose around 6.4V and approximately 1280 Watts just in the cables.
00 AWG would be around 8 milliohms, so 1.6V loss and 320 Watts cable dissipation.
2 AWG would weigh about 25lb.
00 AWG would weigh around 45lb
I just don't see any practical approach using tether cables at that voltage and current...
You would likely get rather better results using a high voltage feed to the drone, so the wires can be thinner and lighter, then use DC-DC converters onboard to power the ESCs.
I think that could be lighter and possibly cheaper than the high current low voltage supplies plus the massive cables?
eg. a 200V feed would only need 20A cable.
You are looking at somewhere in the region of 5000 Watts input power, regardless of the supply arrangement; what are you going to plug that in to??
Whatever you do, it's a massive amount of power if anything goes wrong, with serious risk of fire and injury.