Page 80 - Louth Transformer Catalogue

LT THREE PHASE AUTO TRANSFORMERS

(MADE TO ORDER)

Below are detailed circuit diagrams of two common methods of connecting three phase auto
transformers in a step down star or delta configuration. Step up may also be done.

THREE PHASE STEP DOWN STAR

L1
BROWN
SP L1
BLUE BROWN

L2
L2 BLACK
BLACK
L3
L3 GREY
GREY

THREE PHASE STEP DOWN DELTA
L1
BROWN
L1
BROWN
L2
BLACK

L2
BLACK
L3
GREY
L3
GREY

PLEASE NOTE: AUTO TRANSFORMERS DO NOT PROVIDE INPUT - OUTPUT ISOLATION
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