IEC 61000-1-7-2016 pdf download.Electromagnetic compatibility (EMC) – Part 1-7: General – Power factor in single-phase systems under non-sinusoidal conditions.
This part of IEC 61 000, which is a Technical Report, 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. This Technical Report is applicable only to singlephase systems.
This Technical Report provides definitions for the three following cases:
• the general case where the voltage and current are both distorted (Clause 5),
• the case where the voltage is assumed to be sinusoidal and the current is only distorted with harmonic components (Clause 6),
• the particular case where the voltage and current are both sinusoidal (Annex A).
Annex B 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any amendments) applies.
Void.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 root-mean-square value
r.m.s. value effective value for a time-dependent quantity, positive square root of the mean value of the square of the quantity taken over a given time interval
Note 1 to entry: The root-mean-square value of a periodic quantity is usually taken over an integration interval the range of which is the period multiplied by a natural number.
Note 2 to entry: For a sinusoidal quantity a(t) = Âcos( ω t + ϑ 0 ), the root-mean-square value is A eff = Â/√2.
Note 3 to entry: The root-mean-square value of a quantity may be denoted by adding one of the subscripts eff or rms to the symbol of the quantity.
Note 4 to entry: In electrical technology, the root-mean-square values of electric current i(t) and voltage u(t)are usually denoted I and U, respectively.
[SOURCE: IEC 60050-1 03:2009, 1 03-02-03]
3.2 direct component
mean value of a quantity taken over a given time interval
[SOURCE: IEC 60050-1 03:2009, 1 03-06-05, modified – definition extended to quantities containing interharmonic components.]
3.3 sinusoidal, adj.
pertaining to an alternating quantity represented by the product of a real constant and a sine or cosine function whose argument is a linear function of the independent variable
Note 1 to entry: The real constant may be a scalar, vector or tensor quantity.
Note 2 to entry: Examples are a(t) = Âcos( ω t + ϑ 0 ) and a(x) = Âcos[k(x –x 0 )]. [SOURCE: IEC 60050-1 03:2009, 1 03-07-01 ]
3.4 initial phase
phase angle ϑ 0 value of the phase of a sinusoidal quantity when the value of the independent variable is zero
Note 1 to entry: For the quantity a(t) = Âcos( ω t + ϑ 0 ), the initial phase is ϑ 0 . [SOURCE: IEC 60050-1 03:2009, 1 03-07-05]
3.5 periodic conditions
state of an electric circuit element or electric circuit that is characterized by the electric currents and voltages all being periodic functions of time with the same period T.IEC 61000-1-7 pdf download.