Lightening Arrestor or Voltage Stabilizer

What kind of damage occurred in the control panel?

A major cause of burnt insulation is loose connections where the wire attaches to some distribution point. It may also cause very significant wire oxidation.

Your 3 wire-three phase power will have no ground wire until you transform it from a delta configuration to a wye configuration. Then, if you have significant ground current, it is most likely due to an imbalance.

What is your panel voltage level?

Thanks for ur reply.

The wires were burnt.

There were no loose connections as far as observed.

The panel voltage level is 230V.

Yes, Yes and Yes.

Sorry friend. There is no simple and single solution to power quality at your remote location. Your suspicion on the short on the 11kV line is well iustified. But, so would be nearby lightnings anywhere from the generator to you. Which may be many hundreds of kilometers.

Spikes may be limited in several steps. Spark gaps to limit the most brutal overvoltages. Like 10kV spike on a 220V line. A choke on every phase, to kill high frequency parts of the disturbancy. MOV blocks to absorb, what still gets thru. It is all for spikes that can an will damage electrics and cabling. MOV blocks are Zinc Oxide ceramic bricks that are capable of absorbing spikes frequently present on the power lines. They are replaceable. They are sized to max. voltage: 110V average = 110/0,7 = 157V peak. The MOV I would select is in the range 180-220V, that it would turn on only on really excessive voltages. A fist or two fist size block would protect your equipment. You fabricate your own, I am not aware off the shelf assembly.

You need more? Write!

Thanks for your reply.Yes I understand that.