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4 Calculation formulas
𝑚
𝐸𝑄1+ = ∑ 𝑄1+ (𝑖)𝑇(𝑖)
𝑖=1
𝑄 (𝑖) 𝑓𝑜𝑟 𝑄1(𝑖) > 0
𝑄1+ (𝑖) = { 1
0 𝑓𝑜𝑟 𝑄1(𝑖) ≤ 0
𝑚
𝐸𝑄1− = ∑ 𝑄1− (𝑖)𝑇(𝑖)
Reactive energy of fundamental component
(consumed and supplied)
EQ1+
EQ1-
𝑖=1
varh
𝑄1− (𝑖) = {
|𝑄1 (𝑖) | 𝑓𝑜𝑟 𝑄1 (𝑖) < 0
0 𝑓𝑜𝑟 𝑄1(𝑖) ≥ 0
where:
i is subsequent number of the 10/12-period measurement window,
Q1(i) represents reactive power of fundamental component Q1 calculated in i-th measuring window,
T(i) represents duration of i-th measuring window (in
hours)
𝑚
𝐸𝑆 = ∑ 𝑆(𝑖)𝑇(𝑖)
𝑖=1
Apparent energy
4.2
ES
VAh
where:
i is subsequent number of the 10/12-period measurement window,
S(i) represents apparent power S calculated in i-th
measuring window
T(i) represents duration of i-th measuring window (in
hours)
Split-phase network
Split-phase network
(parameters not mentioned are calculated as for single-phase)
Name
Parameter
Designation
Unit
Method of calculation
Ptot
W
𝑃𝑡𝑜𝑡 = 𝑃𝐴 + 𝑃𝐵
QBtot
var
𝑄𝐵𝑡𝑜𝑡 = 𝑄𝐵𝐴 + 𝑄𝐵𝐵
Q1tot
var
𝑄1𝑡𝑜𝑡 = 𝑄1𝐴 + 𝑄1𝐵
Stot
VA
𝑆𝑡𝑜𝑡 = 𝑆𝐴 + 𝑆𝐵
SNtot
VA
𝑆𝑁𝑡𝑜𝑡 = 𝑆𝑁𝐴 + 𝑆𝑁𝐵
DBtot
var
𝐷𝐵𝑡𝑜𝑡 = 𝐷𝐵𝐴 + 𝐷𝐵𝐵
Total Power Factor
PFtot
-
Total displacement power factor
costot
DPFtot
-
Total tangent 
tantot
-
Total active power
Total Budeanu reactive
power
Total reactive power of
fundamental component
Total apparent power
Total apparent distortion
power
Total Budeanu distortion
power
𝑃𝑡𝑜𝑡
𝑆𝑡𝑜𝑡
1
cos 𝜑𝑡𝑜𝑡 = 𝐷𝑃𝐹𝑡𝑜𝑡 = (cos 𝜑𝐴 + cos𝜑𝐵 )
2
𝑄𝑡𝑜𝑡
𝑡𝑎𝑛𝜑𝑡𝑜𝑡 =
𝑃𝑡𝑜𝑡
where: Qtot = QBtot, when Budeanu method was chosen,
Qtot = Q1tot, when IEEE 1459 method was chosen,
𝑃𝐹𝑡𝑜𝑡 =
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