Sir, we opened checked the VI as we found out that there is current leaks between contact force spring conductor insulted coupling rod due to possible insulation failure.
Please see pics...
Sir it is withdrawble VCB. Please see VCB insulating rod evidence of damage.http://files.engineering.com/getfile.aspx?folder=e900dd92-87ce-4335-8624-2bf6d90afaac&file=20140825_132300.jpg
To All Experts,
Specs of the VCB are below;
VD4 ABB - 17.5 KV/630 Amperes/ 25 KA
Our plant is diesel/bunker C power plant supply the small island. The unit is status is on going commissioning and it is synchronize to the grid.
The diesel generator rated 13.8 KV and 2.1 MW capacity connected...
Dear All,
I will raise this concern because , recently after we tried to back the unit online after replacing the fuse, explosion occurred again but now fuse are okay. During last explosion I observed that there was arcing evidence originated from the VCB. The relay indicates current...
The PT is installed in the switchgear. Yes power cable is connected from generator to switchgear. What do you mean the small details ?
Why the bus PT limiting fuse not blown but generator PT blown?
Im confuse also because, generator potential transformer fuse is always experience blowing fuse but the unit is synchronized to the GRID then why is my bus PT is not affected and its configuration is the same, wye connected primary and wye secondary and broken delta.
Yes Sir, there are many power plant connected in the GRID. I am looking for a solution to operate the plant in ungrounded system what to do because fuse blown twice.
First move, we replace the withdrawble PT and fus, then thesame fuse blown.
Sir Zanoter we are connected directly to grid. Assuming 90% all faults is cause of ground faults due to sub-trasmission lines.
In case there is a line to ground fault in the grid, since my generator is ungrounded or floating nuetral , the effect is the unfaulted phases increase twice or trice ...
To all,
What will be the best solution so that i can run the unit in ungrounded system?
It is okay to change the generator PT from wye connected primary to open delta? What is the effect?
Thanks all you Sir.
Sir Slavag, there is no installed damping resistor in the secondary of the broken delta which is connected to the relay input. What is the ferro-resonance ? This is cause PT fuse blown?
Hi,
To all,
We have 2.1 MW Diesel Power plant supply the small grid , generator rated voltage of 13,8KV and ungrounded or floating nuetral . Our problem is the generator potential transformer wye connected primary and wye connected secondary and broken delta connected secondary , primary PR...
