What is G5/5?
The Energy Networks Association's Engineering Recommendation G5/5 (ENA EREC G5/5), introduced on June 17, 2020, replaces the previous G5/4-1 guidelines that had been in place since 2001. G5/5 establishes design limits for harmonic voltage levels to ensure compliance with IEC compatibility limits when new or additional loads are connected.
By adhering to G5/5 harmonic guidelines, the electrical system is kept within safe harmonic levels, reducing the risk of voltage issues. While some loads connect easily, others may require harmonic mitigation, such as Active Harmonic Filtration, before receiving approval from the Network Operator.
In most cases, if a load passes the G5/5 assessment, the connection is approved, with or without additional harmonic mitigation.
Why Do You Need G5/5 Assessments?
As harmonic-producing equipment becomes more common, it’s crucial to ensure that new electrical installations, whether an additional load or a new connection, don’t negatively impact other consumers. Proper G5/5 assessments prevent harmonic distortion that can harm electrical systems, whether they belong to you, other consumers, or the Network Operator.
By designing systems within G5/5 standards, everyone enjoys a more stable and reliable electrical environment, avoiding operational issues caused by poor power quality.
How is G5/5 Implemented?
G5/5 follows a similar three-stage assessment process as G5/4 but removes specific harmonic current limits in Stage 2. Instead, G5/5 evaluates the allowable converter equipment rating based on factors like equipment technology, fault level at the Point of Common Coupling (PCC), and the difference between current harmonic distortion and G5/5 limits.
A more in-depth harmonic current assessment is only required if earlier stages fail. If the assessment reaches Stage 3, more detailed and potentially costly harmonic modelling may be necessary, making early harmonic mitigation a better option in many cases.
How Cetronic Can Help
Cetronic provides comprehensive G5/5 assessment services, from gathering the necessary data to measuring pre-existing voltage harmonic distortion and producing a detailed report. We also liaise with connection approval bodies (typically DNOs) and equipment manufacturers to resolve any queries during the process.
To schedule a free initial consultation, fill out the form below. We can also provide an in-depth Guide to G5/5 upon request. Let Cetronic ensure your project meets all G5/5 requirements for a seamless connection.
