Vanguard ATRT-03_03B - Manual (Page 34)

REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL
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3.5 Using the Turns Ratio Calculator
The ATRT-03 features a turns ratio calculator that can be used to calculate the turns ratio for
various transformer types. The user only needs to provide the H and X name plate voltage
values. Follow the steps below to use the turns ratio calculator.
a. Start from the “START-UP” menu:
Press the [3] key (CALCULATOR).
b. The following screen will be displayed:
Select the transformer configuration by pressing the corresponding key on the keypad.
For this example, press the
[3] key to select the Y-dT transformer type.
c. The following screen will be displayed:
Type the H name plate voltage value using the keypad and then press the
[ENTER]
key.
d. The following screen will be displayed:
Type the X name plate voltage value using the keypad and then press the [ENTER] key.
e. The following screen will be displayed showing the H and X name plate voltages along
with the calculated turns ratio:
Y to DELTA XFORMER
H: 1,734 V
X: 100 V
RATIO: 10.011
ENTER X WINDING
NAME-PLATE VOLTAGE:
V
ENTER H WINDING
NAME-PLATE VOLTAGE:
V
XFMR CONFIGURATION:
1.SNG PHS 2.dT-Y
3.Y-dT 4.dT-dT
5.Y-Y 6.SP TEST
1.TEST XFMR 08/16/10
2.SETUP 08:14:58
3.CALCULATOR
4.DIAG 5.QUICK TST