69kV Line protection
69kV Line protection
(OP)
We are developing a protection requirement to a power line of 69kV. This line is about 7 kilometer. Because of costs we use 50/51 protection and 67N to backup protection. Is this scheme efficient??? What are the disadvantages of it?
Thanks
Ed
Thanks
Ed






RE: 69kV Line protection
RE: 69kV Line protection
The line is radial and there is a parallel line. One of the end is a generation and i don't have information about the other end.
Thanks
RE: 69kV Line protection
Hope this helps.
RE: 69kV Line protection
RE: 69kV Line protection
RE: 69kV Line protection
I would like add several points.
Standard solution in this case is 50/51, but don't forget:
On the second side( w/o generation) we must install
directional overcurrent 67 with time delay about 0.2-0.5sec.
If we use 67N as back-up protection, we also must install on other side 67N with reverse direction ( time setting lower then 67N on generation side).
Please see attached scheme:
Regards.
Slava