IEEE 644-2019 pdf free.IEEE Standard for Measurement of Power Frequency Electric and Magnetic Fields from AC Power Lines.
The word shuuld indicates that among several possibilities one is recommended as particularly suitable. without mentioning or excluding others: or that a certain course of action is preferred but not necessarily required (should equals is recommended that).
The word mat is used to indicate a course of action permissibic within thc limits of the standard (may equals is pennitted to).
The word can is used for statements of possibility and capability, whether material. physical. or causal (can equals is able to).
2. Definitions
For the purposes of this document, the following terms and definitions apply. The iEEE Standards L)iciionurv OnIinc’ should be consulted for terms not defined in this clause.3 Additional definitions related to corona and field effects can be fijund in IEEE Std 539tM II328I.
crosstalk: The noise or extraneous signal caused by ac or pulse-type signals in adjacent circuits.
electric field: A vector field of electric field strength. E. or of electric flux density, D.
NOTE I—The term is ako used to denote a region in which such vector fields have a significant magnitude.’
NOTE 2— VectorfIeld, The totality ofvectors in a given region represented by a vector tiinction U (x. v, 🙂 of the space coordinates x, y, :. A vector field (in this case, the electric field) associates a vector-valued quantity (in this case, the electric field strength, E. or electric flux density. Di with every point in a given region.
electric field strength (E): At a given point in space, the ratio of force on a positive test charge placed at the point to the magnitude of the test charge, in the limit that the magnitude of the test charge goes to zero. The electric field strength at a point in space in an electric field is a vector defined by space components along three orthogonal axes. For steady-state sinusoidal fields, each space component is a complex number or phasor. The magnitudes of the components, expressed by their root-mean-square (rms) values in volts per meter(VJrn), and the phases need not be the same (see Adler [HI]).S aLw: maximum value of the electric field strength. phasor. vertical component of the electric field strength.
Ai alternative general representation of a stcady-siatc sinusoidal clectric ficld strength us be dcnvcd algcbraically from Equation (I). In this casc, the electric field strength is a vector rotating in a plane where it describes an ellipse for which the rms value of the semi-major axis represents the magnitude and direction of the maximum value of the clectric field strength. and whose semi-minor axis represents the magnitude and direction of the field a quarter cycle later (see (B I) and I 115J). This representation is perhaps more useful in characterizing power-line electric fields where the electric field strength along the direction of the line are small and can usually be neglected. Thus, the electric field strength vector from a power line with parallel conductors is assumed to sweep out an ellipse in a vertical plane perpendicular to the direction olthe power line.
For non-parallel conductors, the electric fidd strength vector describes an ellipse, but the plane of the ellipse may not be vertical. This ellipse may degenerate into a straight line. See aLco single-phase ac fields. poly phase ac fields
The use of the term “ac electric field” is deprecated.
frequency: The number of complete cycles of sinusoidal variation per unit time.
NOTE I—Electric and magnetic field components have a fundamental frequency equal to that of the power line voltages and currents,
NOTE 2—For ac power lines, the most widely used frequencies are 60 Hz and 50 I-li.
harmonic content: Distortion of a sinusoidal waveform characterized by the magnitude and order of the Fourier series terms describing the wave.
NOTE-—For power lines, the harmonic content is t.pically small and of little concern for the purpose of field measurements, except at points near large industrial loads (saturated power transformers, rectifiers, aluminum and chlorine plants. etc.) where certain harmonics may reach 10% of the line voltage. Power equipment such as dc-to-ac and ac-to-dc converters also may produce harmonics. Laboratory installations also may have voltage or current sources with significant harmonic content.
magnetic field: A vector field of magnetic field strength, II. or of magnetic flux density. R see aLso:
malniuin value of the magnetic field, resultant magnetic field.
NOTE I – The term is also used to denote a region in which such vector fields have a significant magnitude.
NOTE 2—Vectorfield. The totality olvectors in a given region represented by a vector function x, y, :1 of the space coordinates x. y.z. A vector field (in this case, the magnetic IkId) associates a vector valued quantity (in this case, the magnetic field strength. II. or magnetic flux density. Th with every point in a given region.
magnetic field strength: A vector quantity, often denoted as H. related to the magnetic flux density, 8. by H (Bun) – M where is the magnetic permeability of free space and M is the magnetization of the magnetic medium. In free space, M vanishes, and the relationship between II and B becomes 11 = B.t. The preferred unit for H is amperes per meter (Aim ).
NOTE I—This term has sometimes been called the magnetic field intensity, but such use of the word intensity is deprecated in favor of strength.IEEE 644 pdf download.