Overhead Line Down Detection
Overhead Line Down Detection
(OP)
I am working on a project focused on the detection of downed energized primary overhead lines to support wildfire mitigation on exposed feeders.
Looking at the SEL-451 relay with Arc Sense Technology (AST) high-impedance fault detection. What other technologies / grounding should be considered for this application? Web search has been pretty fruitless so far.
Looking at the SEL-451 relay with Arc Sense Technology (AST) high-impedance fault detection. What other technologies / grounding should be considered for this application? Web search has been pretty fruitless so far.






RE: Overhead Line Down Detection
RE: Overhead Line Down Detection
RE: Overhead Line Down Detection
RE: Overhead Line Down Detection
11kV Overhead lines.
GEC have a relay that is fed from a split core balance type C/T fitted to the outgoing feeder circuit breaker cable.
I don't have the model no. to hand but will follow up with details.
RE: Overhead Line Down Detection
RE: Overhead Line Down Detection
Electromechanical type: CMU
Solid State type: MCSU
Both relays are used with split core type C/T & method of routing earth conductor & the insulation of cable termination box & any cable armouring is important.
RE: Overhead Line Down Detection
I'd chat up your local sales folk and see what they can offer up from the various relay groups. I'm sure they are all working on it in one form or another.
David Castor
www.cvoes.com
RE: Overhead Line Down Detection
The current that would "return" to the substation on one feeder neutral can be load from that circuit, load from other circuits, ground fault from that circuit, ground fault from other circuits, or any combination. No attempt is made to do any form of protection based on measurement of neutral current.
The solutions being discussed are all looking for the signature of an arcing fault, particularly an arcing fault with very high fault resistance. One of the characteristics being looked for is the high frequency component of the arc.
RE: Overhead Line Down Detection
Could you please post a single line diagram of a typical system used in USA where the problems prevail.
Thanks