Overview
IEC TR 61000-1-7:2016 - Electromagnetic compatibility (EMC) Part 1-7 - clarifies how power factor and related electrical power quantities are defined and related in single-phase systems when voltages and/or currents are non-sinusoidal. The Technical Report explains the two components of power factor: the fundamental power factor (due to phase difference at the fundamental frequency) and the non-fundamental power factor (due to waveform distortion). It is intended to remove ambiguity that arises when sinusoidal assumptions (e.g., using cos φ alone) are applied to distorted waveforms.
Key Topics
- Definitions and terminology for voltages, currents and power under non-sinusoidal conditions.
- Instantaneous values and decomposition into fundamental and distortion components.
- RMS values, total distortion contents and DC ratios.
- Breakdown of active power:
- Active power, DC power, fundamental active power, distortion active power.
- Definitions of apparent power and fundamental apparent power.
- Power factor decomposition:
- Fundamental power factor (phase displacement at fundamental frequency).
- Non-fundamental power factor (impact of harmonics/distortion).
- Special case treatment where the voltage is sinusoidal and the current contains harmonics.
- Informative annexes on sinusoidal conditions and the fundamental active factor.
Requirements and Practical Notes
- Provides consistent, unambiguous definitions for measuring and reporting power quantities in single-phase networks with distorted waveforms.
- Guides interpretation of measurement results (RMS, harmonic content, active vs distortion power) so that equipment impact on supply networks is assessed correctly.
- Focuses on single-phase systems only - do not apply the definitions to multi-phase systems without reference to appropriate documents.
Applications and Who Uses It
- Power quality engineers and consultants assessing power factor, harmonics and distortion.
- Utility engineers and network operators clarifying billing, penalties or connection requirements related to power factor and harmonic distortion.
- Product designers and EMC specialists developing equipment that draws non-sinusoidal currents (e.g., power electronics, LED drivers, chargers).
- Test laboratories and compliance bodies establishing measurement and reporting procedures for non-sinusoidal conditions.
- System integrators and facility managers implementing PFC (power factor correction), harmonic filtering, or specifying mitigation measures.
Related Standards
- Other parts of the IEC 61000 EMC series (general principles, environment classification, emission/ immunity limits, testing/measurement techniques) which provide complementary guidance on testing, limits and installation for electromagnetic compatibility and power quality.
For authoritative use and formal compliance, obtain the full IEC TR 61000-1-7:2016 publication from the IEC webstore or your national IEC committee.