Relationship Between Measurement Error Of Core Loss Pc And Phase Angel Θ (2) - Iwatsu SY-8218 Instruction Manual

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9.3 Relationship between measurement error of core loss Pc and phase angel θ (2)
● The following describes the relationship between the measurement error of the core loss Pc and the phase angle θ when a primary exciting
current i or a secondary induced voltage V
1
If a primary exciting current i
core loss PC becomes worse than described in Section 9.2. This cannot be also escaped from the pure mathematical principle.
When both the primary exciting current i
ingredient is i or V , and the phase difference between these ingredients is θ
n n
In this case, the core loss measurement error is the total of each frequency ingredient of the core loss measurement error shown in expression
(9.2), which can be estimated easily by Section 9.2 and which becomes worse.
is the distorted wave; not a single sine wave.
2
or a secondary induced voltage V
1
and the secondary induced voltage V
1


  
P i V cos
c n n

n 1
is the distorted wave; not a single sine wave, the measurement accuracy of the
2
are the distorted wave, the effective value of each frequency
2
, the core loss Pc is expressed by expression (9.3).
n

(9.3)
n
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B-H ANALYZER SY-8218 / SY-8219