Managing fuse protection in low-voltage networks with distributed generation (2019)
Type of ContentReports
- Engineering: Reports 
AuthorsVan Herel R, Heffernan W, Wood Ashow all
New Zealand’s (NZ’s) uptake of inverter-based solar photovoltaic energy systems can affect fused protection in its 400 V low-voltage (LV) networks. This paper proposes some basic rules that can be applied generally to avoid problems with fuse protection in such networks. NZ’s low-voltage domestic and residential electricity distribution networks typically follow a radial topology beyond the distribution transformer, with a multiple earthed neutral (MEN) earthing system and individual phases connecting residences and premises of small businesses. Most solar photovoltaic (PV) based inverter energy systems (IESs) are installed on north-facing rooftops at suburban residences. The inverters are connected to the main supply into each installation connection point (ICP), usually installed wherever the main circuit board is located. Electricity is exported to the distribution network from behind the domestic metering equipment. Increasing PV uptake in NZ is a ecting power ows in its distribution networks . New types of fault can occur under these new conditions, in networks that were designed originally for unidirectional power ow. As such, it is important to maintain a properly discriminated protection scheme that ensures fuses operate as they should. Problems with protection systems in high-voltage (>1 kV) distribution systems hosting high penetrations of IESs have been studied in signi cant depth . Speci c consideration of the behaviour of fuses at the low-voltage level has been uncommon to date, and this paper addresses the management of fuse-based protection in low-voltage networks with high penetration of IESs. Of particular importance is the relationship between fuses and the conductors they protect, and the purpose of developing this method is to ensure that the phenomenon of conductor “burndown” or “burnout” can be avoided with certainty
CitationVan Herel R, Heffernan W, Wood A (2019). Managing fuse protection in low-voltage networks with distributed generation.
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