This standard specifies the measurement methods for high-voltage AC overhead transmission lines, substation power frequency electric field, and power frequency magnetic field. This standard is applicable to all voltage levels of AC high-voltage overhead transmission lines and substations. The following terms and definitions apply to this standard. 2.1 Power frequency electric field is a material form that exists around the charge, and the electric field of a charge that undergoes a periodic change of 5OHz over time is called a power frequency electric field. The strength of the electric field is a vector at any point in space, measured in V/m, but the electric field units of AC high-voltage overhead transmission lines and substations are generally expressed in kV/m. 2.2 Power frequency magnetic field A power frequency magnetic field is a form of material that exists around a regularly moving charge (current), and a magnetic field that undergoes a 5OHz periodic change over time is called a power frequency magnetic field. The magnetic induction intensity is a vector whose divergence at any point is 0, and its measurement unit is T. The magnetic field intensity is also a vector, and its measurement unit is A/m. In air medium, 1uT is equivalent to 0.8A/m. 2.3 Distortion field Perturbed field: Changes in amplitude, direction, or both of a field due to the intervention of an object. Note: Due to the presence of objects, the electric field usually produces significant distortion on the surface of the object. As long as it is not a magnetic substance, the power frequency magnetic field usually does not deform due to the presence of objects. The measurement of power frequency electric field and magnetic field using 3 measuring instruments must use dedicated probes or power frequency electric field and magnetic field measuring instruments. Power frequency electric field measurement instruments and power frequency magnetic field measurement instruments can be separate probes or instruments that combine the two. However, regardless of the type of instrument, it must be verified by the metrology department and within the validity period of the verification
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