App-9
IM 253710-01E
Appendix
App
{u(t)}
2
dt
1
T
0
T
u(t)
dt
1
T
0
T
π
2
2
∆
Urms
2
–
∆
Udc
2
∆
Urms
∆
Umn
∆
Udc
∆
Uac
u(t) dt
1
T
0
T
Computed
Item
Equation
{i(t)}
2
dt
1
T
0
T
i(t)
dt
1
T
0
T
π
2
2
∆
Irms
2
–
∆
Idc
2
∆
Irms
∆
Imn
∆
Idc
∆
Iac
i(t) dt
1
T
0
T
Computed
Item
Equation
Note
•
If the sampled data used in the computation do not exist (for example, when the module is not
installed), the sampled data are considered to be 0’s for the computation.
•
It is recommended that the measurement range and scaling (PT/CT ratio and coefficients) of
the elements that are being computed (delta computation) be set the same as much as
possible. Using different measurement ranges or scalings causes the measurement resolution
of the sampled data to be different. In effect, the computation result will have errors.
Delta Computation Menu/Display Position during All display
Delta
Computation
Menu
u1–u2
Delta
Star
i1–i2
3P3W
3V3A
Star
Delta
Display Format during All display
Element1 Element2 Element3 Element4
Σ
A
Σ
B
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Urms1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Umn1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Udc1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Uac1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Irms1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Imn1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Idc1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Iac1
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Urms1
- - - - -
∆
Urms3
- - - - -
- - - - -
- - - - -
∆
Umn1
- - - - -
∆
Umn3
- - - - -
- - - - -
- - - - -
∆
Udc1
- - - - -
∆
Udc3
- - - - -
- - - - -
- - - - -
∆
Uac1
- - - - -
∆
Uac3
- - - - -
- - - - -
- - - - -
∆
Irms1
- - - - -
∆
Irms3
- - - - -
- - - - -
- - - - -
∆
Imn1
- - - - -
∆
Imn3
- - - - -
- - - - -
- - - - -
∆
Idc1
- - - - -
∆
Idc3
- - - - -
- - - - -
- - - - -
∆
Iac1
- - - - -
∆
Iac3
- - - - -
- - - - -
- - - - -
∆
Urms1
∆
Urms2
∆
Urms3
- - - - -
- - - - -
- - - - -
∆
Umn1
∆
Umn2
∆
Umn3
- - - - -
- - - - -
- - - - -
∆
Udc1
∆
Udc2
∆
Udc3
- - - - -
- - - - -
- - - - -
∆
Uac1
∆
Uac2
∆
Uac3
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Irms4
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Imn4
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Idc4
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Iac4
- - - - -
- - - - -
∆
Urms1
∆
Urms2
∆
Urms3
- - - - -
- - - - -
- - - - -
∆
Umn1
∆
Umn2
∆
Umn3
- - - - -
- - - - -
- - - - -
∆
Udc1
∆
Udc2
∆
Udc3
- - - - -
- - - - -
- - - - -
∆
Uac1
∆
Uac2
∆
Uac3
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Irms4
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Imn4
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Idc4
- - - - -
- - - - -
- - - - -
- - - - -
- - - - -
∆
Iac4
- - - - -
- - - - -
- - - - -
- - - - -
∆
Urm
∆
Umn
∆
Udc
∆
Uac
∆
Irm
∆
Imn
∆
Idc
∆
Iac
∆
Urm
∆
Umn
∆
Udc
∆
Uac
∆
Irm
∆
Imn
∆
Idc
∆
Iac
∆
Urm
∆
Umn
∆
Udc
∆
Uac
∆
Irm
∆
Imn
∆
Idc
∆
Iac
∆
Urm
∆
Umn
∆
Udc
∆
Uac
∆
Irm
∆
Imn
∆
Idc
∆
Iac
Measurement
Function Symbol
Note
During All display, the result of the delta computation is displayed at the position of each
element as shown above, but the number attached to the symbol has no relation to the
element number. For example, if [i1-i2] is selected from the delta computation menu, the true
rms value of [i1-i2] is computed and displayed at [
∆
Irms1].
Appendix 3 Determination of Delta Computation