Electrical Engineering - 3 phase delta (unbalanced load)

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3 phase delta (unbalanced load)

Lew

2006-03-15, 6:29 pm

L1---------------.---------------------.------------------------------------------------------------
| |

| |

L2-----------.--------------------.---------------------------------------------------

| | | |

| | | |

L3-----.---------------------.------------------------------------------------------------------------------
| | | | | |
| | | | | |
| | | | | |
| /\ | | /\ |
300 | / \ 300 | / \ |
| / \ | 2000 / \ | 2000
|/______\| |/______\|
300 2000

A SCR pulses 480VAC to the above resistive heating element arrangement.
Notice, I have 2 seperate deltas 300ohm legs and 2000 ohm legs. NOT
SHOWN IN THE ABOVE DIAGRAM IS 575 ohm heaters across L1-L3 and another
575 ohm heater (resistor) across L2-L3. Using an amp clamp, I have
39,39, and 9 amps on legs L1,L2, and L3. How do I calculate what I
should have in theory?

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