The Harmonized System of tariff nomenclature are internationally standardized names and numbers maintained by the World Customs Organization for classifying traded products. World Customs Organization (WCO) is an intergovernmental organization that helps member states communicate and cooperate on customs issues. ...
According to the World Customs Organization, the Harmonized System is used as a basis for:
Customs tariffs
Collection of international trade statistics
Rules of origin
Collection of internal taxes
Trade negotiations (e.g., the WTO schedules of tariff concessions)
Transport tariffs and statistics
Monitoring of controlled goods (e.g., wastes, narcotics, chemical weapons, ozone layer depleting substances, endangered species)
Areas of Customs controls and procedures, including risk assessment, information technology and compliance.
Harmonic measurements are very useful in that they provide information necessary to characterize the loads as well as provide a means for verifying the harmonic model.
Measured harmonic currents are used as input to the model and simulated harmonic voltage distortion levels are then compared with measured values to determine the accuracy of the model.
The effect of important system parameters (capacitors, loads, transformer sizes) is evaluated and the potential for problem resonance conditions is determined (5th or 7th harmonic resonance is the most important).
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