Specifications

G4500 BLACKBOX PORTABLE OPERATIONAL MANUAL
August 2010
Elspec | Website
59
TDD
Total Demand Distortion – TDD – is the current distortion (harmonics above
the 1
st
) as a percent of maximum demand load. TDD is defined using the follow-
ing relationship:
I
TDD
=
%100*
2
2
2
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




h
L
h
I
I