What is PD IEC/TR 61000-1-7- Electromagnetic compatibility (EMC) in single-phase systems about?
PD IEC/TR 61000-1-7 is a safety standard on electromagnetic compatibility (EMC).
PD IEC/TR 61000-1-7 which is a Technical Report that provides definitions of various electrical power quantities and the relationship between them under non-sinusoidal conditions, in order to give clear information on both components in the power factor: the fundamental power factor, which is due to the phase difference between the voltage and current at the fundamental frequency, and the non-fundamental power factor, which is related to the distortion of the voltage and/or current.
PD IEC/TR 61000-1-7 provides definitions for the three following cases:
- The general case where the voltage and current are both distorted
- The case where the voltage is assumed to be sinusoidal, and the current is only distorted with harmonic components (Clause 6)
- The case where the voltage and current are both sinusoidal
PD IEC/TR 61000-1-7 gives information on the fundamental active factor, which is used to describe the behaviour of a piece of equipment as a load or a generator.
Note: PD IEC/TR 61000-1-7 is applicable only to single-phase systems.
Who is PD IEC/TR 61000-1-7- Electromagnetic compatibility (EMC) in single-phase systems for?
PD IEC/TR 61000-1-7 on power factor in single-phase systems under non-sinusoidal conditions is relevant to:
- Electricians
- Electrical engineers
- Manufacturers of measuring equipment and apparatus
- Manufacturers of analyzers, antennas, and accessories
- Testing authorities
- EMC engineers
Why should you use PD IEC/TR 61000-1-7- Electromagnetic compatibility (EMC) in single-phase systems?
The prevalence of loads drawing non-sinusoidal current from power systems requires clarification of such concepts as power and power factor, to avoid confusion due to implied assumptions of sinusoidal voltage and current.
PD IEC/TR 61000-1-7 specifically addresses the terms related to the power factor of equipment that is applicable regardless of the voltage and current waveforms. When voltages and currents on power supply networks are perfectly sinusoidal, cos ϕ corresponds to the power factor. But this is not true anymore when electric quantities are distorted. In some existing documents, cos ϕ is still used as a power factor, leading to an incorrect assessment of the equipment impact to supply networks.
The purpose of PD IEC/TR 61000-1-7 is to give clear information on both components in the power factor:
- The fundamental power factor, which is due to the phase difference between the voltage and current at the fundamental frequency (cos ϕ 1)
- The non-fundamental power factor, which is related to the distortion of the voltage or current
Overall, PD IEC/TR 61000-1-7 is helpful as it assists the user with the sinusoidal conditions, i.e., the state of a linear electric circuit element or electric circuit that is characterized by the electric currents and voltages all being sinusoidal functions of time with the same frequency.