IEC TS 62749-2020 pdf free

IEC TS 62749-2020 pdf free.Assessment of power quality – Characteristics of electricity supplied by public networks.
Most of the recommendations for power quality at the point of supply are expressed as power quality indices that describe the manner in which the characteristics of electricity vary. Such
variations may appear random in time, with reference to any specific point of supply, and random in location, with reference to any given instant of time. As such, the power quality indices are based on the occurrence of the applicable electromagnetic phenomena:
• continuous phenomena, i.e. deviations from the nominal value that occur continuously over time. Such phenomena occur mainly due to load pattern, changes of load, non-linear loads or distributed generation,
• discontinuous phenomena or events, i.e. sudden and significant deviations from normal or desired wave shape which typically occur due to unpredictable events (e.g. faults) or external causes (e.g. weather conditions), and
• other phenomena, i.e. phenomena occurring in the presence of mains communicating systems (MCS) andIor equipment using switch-mode technology connected to the grid. For more information about other phenomena, see Annex G.
The power quality indices and the recommended values are intended to be used as technical reference for regulatory purposes (e.g. in network codes) or for contracts between network operator and network user (e.g. part of a connection agreement).
Power quality requirements combine the obligations of network operators with the requirements of equipment or installations on the electromagnetic environment. It is worth noting however, that the requirements of equipment or installations on the electromagnetic environment also include emission aspects that are addressed in other IEC standards (see Clause 2 and Annex F).
NOTE 1 Network operators are in charge of developing and operating the electricity supply system taking into
account at the same time:
• provision of adequate conditions for equipment, installations or other networks connected to their network;
• avoidance of unnecessary costs.
NOTE 2 In many countries/regions, requirements concerning the essential characteristics of electricity at points of supply of public networks are set, or controlled, by National/Regional Regulatory Authorities.
In some cases, additional requirements or differences in requirements can be agreed by terms of a contract (usually a connection agreement) between an individual network user and the network operator. Such a contract is most likely to arise for network users with relatively large electricity demand, supplied from the MV or HV network, or having power quality sensitive load. It may also arise in sparsely populated or difficult terrain, such as mountain regions, where distribution costs are high. In such an area, a network user may be willing to accept a connection, at lower cost, which does not entirely comply with the power quality standards.IEC TS 62749 pdf download.