Unbalanced open delta loads

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Joethemechanic

Joethemechanic

Senior Member
Location
Hazleton Pa
Occupation
Electro-Mechanical Technician. Industrial machinery
Is there any portion of the primaries feeding your transformers that runs underground? Or any kind of unusual close spacing of the primary conductors?

How far off the road is this pump station? Does it have it's own pole line for the primaries? If so is it 2 phases and a MGN?
 
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kclark8799

Member
Location
NW Florida
Occupation
Electrical
Joethemechanic said:
Is there any portion of the primaries feeding your transformers that runs underground? Or any kind of unusual close spacing of the primary conductors?

How far off the road is this pump station? Does it have it's own pole line for the primaries? If so is it 2 phases and a MGN?
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All overhead and did notice that the 2 phases are burning tops of trees in one area. The 2 primaries run approximately 3/4 mile . Then an underbuilt with two pole spands feeds lift station transformers. Two houses feeds off the unproblematic phase.
 
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Bjenks

Senior Member
Location
East Coast of FL
kclark8799 said:
I have a 15hp 3phase 230 v. pump. Voltage is good phase to phase but amps are 16 , 34 , and 34. On stand by generator everything is great at 34 amps. Power company replaced everything but the pole with no change. Even followed the primary when crossed. Any ideas.
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34/Sqr(3) is 19.62A which is pretty close to how the current would change when you take a closed delta and remove the impedence on one of the legs and make it an open delta.
 
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