Transmission line ceramic insulator flash over ?
Transmission line ceramic insulator flash over ?
(OP)
Dear Forum,
I've tried to find the similar trhead but unfotunately there is no thread discussing this matter.
We have 150 kV transmission line double circuit distance 16 km with average load 110 MW.
Recently we experinced flash over on some of ceramic insulator and trips both lines, the weather was misty rain and foggy.
For short term remedy we wash (energized wash) the ceramic insulator.
For long term remedy I still need more input.
The suspect of this event are : changing season from long dry season to wet season, the line near(you can see the coast line from the towers)wind with salty water from sea.
My option are :
1. add more ceramic insulator
2. coating with silicone which I already proved not make any improvement with my MV O/H line right near the sea, and the coating will peeled if we do the energized washing.
3. Chopper energised washing.
Is any one on the forum experince similar problem ?
If any one has some suggestion ?
I'm scraching my head,pulling my hair this last couple weeks to find good resolution to make sure this not happen again.
Thanks
Pitat
I've tried to find the similar trhead but unfotunately there is no thread discussing this matter.
We have 150 kV transmission line double circuit distance 16 km with average load 110 MW.
Recently we experinced flash over on some of ceramic insulator and trips both lines, the weather was misty rain and foggy.
For short term remedy we wash (energized wash) the ceramic insulator.
For long term remedy I still need more input.
The suspect of this event are : changing season from long dry season to wet season, the line near(you can see the coast line from the towers)wind with salty water from sea.
My option are :
1. add more ceramic insulator
2. coating with silicone which I already proved not make any improvement with my MV O/H line right near the sea, and the coating will peeled if we do the energized washing.
3. Chopper energised washing.
Is any one on the forum experince similar problem ?
If any one has some suggestion ?
I'm scraching my head,pulling my hair this last couple weeks to find good resolution to make sure this not happen again.
Thanks
Pitat






RE: Transmission line ceramic insulator flash over ?
Our Option is : 1 )Add more number of insulators.
2 )Increase voltage rating of the insulator.
Our experience:
Our 33 kv Outdoor substation is nearby seashore. All the supporting insulators are designed for 66 kv . So there is Flash over of Insulators. No need for frequent maintenance.
RE: Transmission line ceramic insulator flash over ?
May be you might have difficulties in expenses. But as we changed the ceramic insulators to silicone rubeer type the tripping on coastal lines (MV) (and on hills where humidity is high) have reduced drastically prooving the point. Yet we are still to pass the first cycle. Also these insulators do not require hot line washing.
RE: Transmission line ceramic insulator flash over ?
I dont understand "Yet we are still to pass the first cycle", Please explain ?
Thanks
Ilyas
RE: Transmission line ceramic insulator flash over ?
RE: Transmission line ceramic insulator flash over ?
RE: Transmission line ceramic insulator flash over ?
Check with Hastings or S&C for the polymer types and ratings.
RE: Transmission line ceramic insulator flash over ?