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Surge Testing DR Unit
Npts
∑
Abs
=
=
i
1
EAR
−
1
2
Npts
∑
=
j
What the formula above does is calculate the ratio of the two areas shown in the two figures
to the right.
To summarize, the EAR is the pink area divided by the blue area.
The EAR algorithm is on the DR to calculate the Line to Line EAR (L-L EAR). The L-L EAR is
used to numerically quantify the difference between the three waveforms of a three phase
motor's surge test.
Fig 3-7: Graphical EAR explanation
12/7/2009 | 71-026 V2
PP24
−
(
) 1
(
) 2
(
F
F
)
i
i
(
) 1
Abs
(
F
)
j
1
27
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