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1.4 Measurand
Table 5.1-4
Ia, Ib, Ic,
I1,I2,I0,Ie
Va,Vb,Vc,V1,V2,V0,Vs,
P, Q, f
Correspondent Element
ID for the primary values
Note: The above coefficients can be derived with the following equations:
(1) Currents in three-phase (I
L1
, I
L2
, I
L3
) and in symmetrical component (I1, I2, I0):
where, In: Secondary current rating
For example, in In=1A , we can have coefficient 1706.666667.
(2) Earth fault current (I
e
) and I
e
used for SEF (I
se
) :
where, In: Secondary current rating (or Ise rating current)
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