In Need Of 3 Phase Step Down Transformer

[Digging4Truth]

Originally Posted by Timmy

Finally... I'm on it... I am going to pick it up in my mini van as soon as I get off work.


By the way.... HILARIOUS....:ursofu nny

[Timmy]

[tbpew]

D4T,
Since your power center will be a distribution panel on the SECONDARY of a transformer, I strongly suggest that you and your CAMPER TECH STAFF, construct a driven grounding electrode system to provide the 'earthing' of your transformer's secondary NUETRAL.

Your electrical distribution system NEEDS to tied to ground to stablize the phase voltages and to insure a real return path to source exists at the time of ANY (including the FIRST) phase to ground fault.

[Timmy]

TB, who taught you English? Commander Scot of the USS Enterprise?

[Ron]

D4T, glad it all is working out for you!

[Ron]

Originally Posted by Timmy

TB, who taught you English? Commander Scot of the USS Enterprise?

So long as he doesn't mention matter & antimatter streams!

[tbpew]

One final thing (like I can really ever just have one last electrical thought!)....

You can meet your need by deploying three single phase transformers. Your world (temporary electrical distribution system) is going to be limited by the single phase capacity of the generator so three (3) single phase transformers would be used to match (or exceed) the rating of the generator.

It turns out that you can ADD KVA ratings to get to the total.

Example
3-20 Kva single phase transformer would provide 60 KVA when connected as a three phase connected as an assembly in a delta or in a wye (3w or 4w) configuration.

The only advantage MIGHT BE the weight and volume of each part involved in the transport and temporary installation. THE CAUTION would be in making sure that you follow POLARITY indications. IF YOU END up with three single phase units PLEASE CALL ME or send me pictures and I will go over how to make the connections if you do not have an electrical resource that is familiar with polyphase installations.

[Digging4Truth]

Originally Posted by tbpew

D4T,
Since your power center will be a distribution panel on the SECONDARY of a transformer, I strongly suggest that you and your CAMPER TECH STAFF, construct a driven grounding electrode system to provide the 'earthing' of your transformer's secondary NEUTRAL.

Your electrical distribution system NEEDS to tied to ground to stabilize the phase voltages and to insure a real return path to source exists at the time of ANY (including the FIRST) phase to ground fault.

Will do bro. We want this to be a long term system and a driven ground is a small price to pay to ensure a stable voltage.

[Digging4Truth]

Originally Posted by tbpew

One final thing (like I can really ever just have one last electrical thought!)....

You can meet your need by deploying three single phase transformers. Your world (temporary electrical distribution system) is going to be limited by the single phase capacity of the generator so three (3) single phase transformers would be used to match (or exceed) the rating of the generator.

It turns out that you can ADD KVA ratings to get to the total.

Example
3-20 Kva single phase transformer would provide 60 KVA when connected as a three phase connected as an assembly in a delta or in a wye (3w or 4w) configuration.

The only advantage MIGHT BE the weight and volume of each part involved in the transport and temporary installation. THE CAUTION would be in making sure that you follow POLARITY indications. IF YOU END up with three single phase units PLEASE CALL ME or send me pictures and I will go over how to make the connections if you do not have an electrical resource that is familiar with polyphase installations.

I certainly will. Thanks a million...

[tbpew]

Originally Posted by Digging4Truth

Will do bro. We want this to be a long term system and a driven ground is a small price to pay to ensure a stable voltage.

I would suggest 2 or even 3 (rods)....and if it may be there for years....3/4" copper clad rather than 5/8 galvanized (supply houses almost always carry both).

You will need the basic clamps and grounding electrode CONDUCTOR...to interconnect the grounding system (without splicing).

Depending on the size of your secondary service conductors.....will set your grounding electrode conductor....

See table 250-66 in NEC (2008) --table no. may be different if you are referencing an earlier NEC version.

The softer the soil, the poorer the ground. A rod that takes a bit of a work-out to drive is best (soil is tight but has moisture).

The reasons I suggest multiple rods is because for your PRIMARY grounding system we want to achieve the lowest grounding resistance within a reasonable effort. Rods should always be installed with a MINIMUM SPACING of six feet.

......

ON THE OUTSIDE chance this installation involves the pouring of a concrete pad, a UFER Ground system can be used in lieu of the driven electrodes. This is an excellent approach if the soil is rocky or very dry (moisture is key to ground conductivity)