GB/Z 17625.13-2020 Electromagnetic compatibility—Limits—Assessment of emission limits for the connection of unbalanced installations to MV,HV and EHV power systems

Scope

This part of the "Electromagnetic Compatibility Limits" provides a guideline for the basic requirements for unbalanced facilities (i.e., three-phase facilities that cause voltage imbalance) to be connected to public medium-voltage, high-voltage, and ultra-high-voltage power systems (low-voltage facilities will be regulated in other national standard documents). In this part, unbalanced facilities refer to three-phase facilities (which may be loads or power generation equipment) that cause voltage imbalance in the system. There is no specific description of the connection of single-phase facilities, as the connection of such facilities is controlled by system operators or owners. However, these general principles can also be applied when considering the connection of single-phase facilities. The main objective of this part is to guide the engineering practices of system operators or owners, so as to provide sufficient service quality for all connected users. However, this part does not intend to replace the emission limit standards of equipment when it comes to facilities.
This part focuses on the capacity allocation for system interference absorption; it does not address how to mitigate interference and how to expand the system's capacity.
Since the standards highlighted in this part are based on certain necessary simplifications and assumptions, there is no guarantee that this method can provide the best solution for all unbalanced loads. In terms of engineering, it is advisable to flexibly use and evaluate the recommended methods in all or part of the assessment procedures.

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