1. LL - voltage line to line
Measurement of voltage line to line depends on PT ratings programmed in the meter and the supplied voltage.
For example : PT primary = 11000 V
PT secondary = 110 V
Input Voltage at meter terminals = 100 V
Amps average = 10 A
PF average = 0.98
Then, VLL = (PT primary/PT secondary)*Input voltage
Hence, VLL = (11000/110)*100 = 10 KV
2. Ln - voltage line to neutral
VLN = (VLL)/(Root3)
Considering above example, VLN =(10000)*(1.73) = 5.78 KV
3. U - Watts total
W = (Root3)*(VLL)*(Amps average)*(PF average)
Considering above example, W = (1.73)*(10000)*(10)*(0.98) = 169540 Watts i.e., 169.54 KW