When professionals want to manage an electrical system in a new installation or after retrofit or extension of an existing installation, it is important to consider the Harmonic currents emitted by the non linear loads connected to the distribution system.
The non linear loads or products producing harmonics can be as example, for industrial equipments: welding machines, battery chargers, variable speed drives for electrical motors, uninterruptible power supplies, or for office equipments or household appliances: TV sets, fluorescent lighting, light dimmers, etc…
I think that it is sometimes the only best solution to mitigate harmonics at the equipment level by using passive filters or active filters. But you can also consider that the good solution is to mitigate at the installation level. For instance, an active filter can be located at the input of the main supply network in order to mitigate harmonics of all equipments, or for a group of non linear loads.
From the utility point of view, it is mandatory to comply with limits required by standards at the PCC. PCC is the Point of Common Coupling located in the public supply system, closest to the installation concerned, at which other installations (customers) are connected. National or international standards suggest limits to comply with at the PCC, like the Total Voltage Distortion THD.
Some parameters are to be considered at installation and equipment level like Isc, Ssc, Rsc, in order to know what harmonic limits are required. Considering your experience on the field, do you think it is easy to collect that kind of information? And do you know what are the different harmonics mitigation solutions, available for your installation?
I will be glad to react to other point of views.