Generally a harmonic is a integer multiple of the fundamental frequency (nominal fn). When we have a fn of 50 Hz, the 3rd harmonics is traveling with 150 Hz. We can have harmonics in the voltages and in the currents.
. There are two commonly used methods to calculate the apparent power (VA).
The traditional method is the vectorial calculation.
Demand is a measure of average power consumption over a fixed time interval. Maximum (or peak) demand is the highest demand recorded over the billing period. The billing period is mostly end of the month. Non-domestic electrical power users often have to pay a maximum demand charge in addition to the charge for the consumed …
Technical losses are coming from current flowing in electrical installations. They can not be avoided, but reduced by proper installation. Technical losses can be calculated.