3000A 230kV Getaway Cable 1

[davidbeach]

Anybody have any experience with anything along the lines of a 3000A 230kV insulated cable run? Not that it's the best solution, but what somebody might get backed into. Overhead seems to be off the table at the moment even if it might be a better solution; lets just say we got backed into getting out the wrong side of a crowded substation. So, if you have knowledge of anything even sort of like that, what does it look like? What's the ampacity of one cable? How many cables can you bring up a single riser pole? Somehow I'm picturing 6 conductors at 500A per phase; what does it look like to terminate 6 conductors to a line at one end and those same six conductors to a pipe bus at the other end. Facing a whole new frontier...

Thanks for any useful hints and suggestions.

I’ll see your silver lining and raise you two black clouds. - Protection Operations

 

[waross]

Short runs, 15 kV cable in an underground substation.
Single conductor, lead sheathed, PVC jacketed cable.
As I recall, 3600 MCM cable. Yes, 3.6 time 1000 MCM.
One of the electricians cut souvenir samples from a cut-off end. If I find mine, after many years, I'll post a picture.
The cables ran from ceiling mounted bus in one room, in underfloor ducts, to a 6000 Amp breaker in an adjacent room.
With expanding loads in the city, a second out-going switch-gear lineup was being installed.
Typical stress cones on each end of the cable.
Pulling those cables into underground duct became exciting.
A Greenlee Tugger was pulling and at the feed end, a rope tied to a fork-fift truck was pushing.
The drive chain on the tugger broke and the stretch in the pull rope caused the capstainto back-spin.
The chain doubled up and smashed the aluminum chain guard.
There were pieces of aluminum and broken chain flying everywhere.
With the ceiling covered with 15 kV bus and several thousands of Amps of rated current, let alone fault current,
God let us live.
Nothing bridged between the bus bars.
More to come.
I'll draw a sketch of an installation closer to what you are proposing.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

 

[7anoter4]

ABB presents a catalogue for XLPE insulated cables up to 500 kV. Attached here it is an extract for 230 kV cables.
According to this table you need only 2 parallel cables of 4931 mcm copper cable one cable per duct in a duct bank.
See ABB XLPE Cable Systems User's guide

 

[7anoter4]

For 100% load factor you need then 3 cables of 2000 mcm and a duct bank of 3*3 ducts in the same conditions

 

[waross]

This WAS 6 x 15 Kv Cables transitioning from underground to overhead bus.
The PVC ducts approached the structure at a 45 degree angle to maintain spacing.
The individual single conductor cables were stress coned and connected to overhead bus.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

 

[davidbeach]

Thanks. That's some pretty impressive cable.

I’ll see your silver lining and raise you two black clouds. - Protection Operations

 

[wroggent]

Here's a couple of 230kV risers:

These two may be in the neighborhood of 2000kcmil CU and 900A per cable @ 75% load factor:

https://www.google.com/maps/@33.428...2WObtctkQaDJqAA!2e0!7i16384!8i8192?authuser=0

https://www.google.com/maps/@33.428...ZIYQGgu-7o5wqoQ!2e0!7i16384!8i8192?authuser=0

No details on these two:

https://www.google.com/maps/@33.290...Q05-Cp2YDj3YhyQ!2e0!7i16384!8i8192?authuser=0

https://www.google.com/maps/@33.291...9d7c6QLbabJWs9A!2e0!7i16384!8i8192?authuser=0

https://www.google.com/maps/@33.291...XMPYnnrVILRU4tg!2e0!7i16384!8i8192?authuser=0