Vanguard TTRA-S2 (ATRT-03 S2, ATRT-03A S2, ATRT-03B S2, Tri-Phase) - Manual (Page 25)

REV 2 TTRA-S2 VERSION 1.x SOFTWARE MANUAL
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4.8.2. Displaying the Deviation Graph
The deviation graph is a useful tool for analyzing the transformer ratio deviation. The deviation
graph displays the phase A, B, and C turns-ratio deviation of the current test record. The
following formula is used to calculate the deviation, or percent difference:
Deviation = |[(Ratio
calculated
– Ratio
measured
)/ Ratio
calculated
] x 100|
To display the deviation graph for the loaded test record, click on the File menu and then select
the Display Deviation Graph option. A typical deviation graph is shown below in Figure 4.
Figure 4. A Typical Deviation Graph