Parelled cables and step distance relaying
Parelled cables and step distance relaying
(OP)
Can paralleled cables (242kv XLPE, 1,500cu) be protected via a single CT or does each cable need its own CT? I'm thinking that theoretically it will work if the impedance is set to account for only one cable, however I am not sure if mutual coupling will cause over or under reaching. Each 3 phase set is cross bounded on the ground shield and each phase in its own conduit.






RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
@DavidBeach: Well said, and I will take this into account. If studies were to demonstrate this idea as impractical; would using 2 CTs (one per cable) externally paralleled (at the test switches) make any difference over summing each CT internally within the relay?
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
Yeah, you can jumper them. Our group ask for it, and sometimes we get it. We don't get them installed every quarter mile when we do get them.
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
RE: Parelled cables and step distance relaying
I will probably go the two relay route.