Power

[haisa]

Hello,
What are the possible faults on transmission lines apart from long trees grounding the line?
We have a 330KV line that keeps tripping but continue in service once closed back. We have cleared all vegetations under the line and all terminal equipment have passed insulation resistance test.
What is arc resistance test.

 

[magoo2]

There's a lot of possibilities but it depends what part of the world you are in. Your title is also too broad and doesn't seem to relate to your question.

What relay information did you get?

How about:
- lightning
- contamination
- birds