B. Test Templates
72A-2570-01 Rev. K 07/2011 B-3
Autotransformers
* Indicates short-circuit tests where the terminals are shorted together with three
sets of jumpers, to provide symmetry (X1-X2, X2-X3, X3-X1) OR (Y1-Y2,
Y2-Y3, Y3-Y1). The neutral is not included for 3 wye connections but may
be included for 1 test connections.
Table B.2 Autotransformer without Tertiary or with Buried Tertiary —
9Tests
Test Type Test # 3 1
Series Winding (OC)
All Other Terminals
Floating
Test 1 H1-X1 H1-X1
Test 2 H2-X2
Test 3 H3-X3
Common Winding (OC)
All Other Terminals
Floating
Test 4 X1-H0X0 X1-H0X0
Test 5 X2-H0X0
Test 6 X3-H0X0
Short Circuit (SC)
High (H) to Low (L)
Short [X1-X2-X3-X1]*
Test 7 H1-H0X0 H1-H0X0
Short
[X1-H0X0]*
Test 8 H2-H0X0
Test 9 H3-H0X0
Table B.3 Autotransformer With Tertiary — 18 Tests
Test Type Test # 3 1
Series Winding (OC)
All Other Terminals Floating
Test 1 H1-X1
H1-X1Test 2 H2-X2
Test 3 H3-X3
Common Winding (OC)
All Other Terminals Floating
Test 4 X1-H0X0
X1-H0X0Test 5 X2-H0X0
Test 6 X3-H0X0
Tertiary Winding (OC)
All Other Terminals Floating
Test 7 Y1-Y3
Y1-Y2
(Y1-Y0)
Test 8 Y2-Y1
Test 9 Y3-Y2
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