scope:

This part of IEC 63222, which is a Technical Report, collects relevant information on power quality impacts from, e.g., CIGRE reports, case studies, research findings, etc., in order to uncover the mechanisms of how electrical equipment/installations/system are impacted by power quality disturbances, as well as to fully understand the guidelines for power quality management.

The contents of this document aim to help network operators, network users and equipment suppliers make rational investments and actively cooperate to manage power quality and keep it consistent with relevant EMC standards.

NOTE 1 The boundaries between the various voltage levels may be different for different countries/regions. In the context of this document, the following terms for system voltage are used:

• low voltage (LV) refers to U_N ≤ 1 kV

• medium voltage (MV) refers to 1 kV < U_N ≤ 35 kV

• high voltage (HV) refers to 35 kV < U_N ≤ 230 kV

NOTE 2 Because of existing network structures, in some countries/regions, the boundary between medium and high voltage can be different.