Vll

VLL is an acronym that can refer to several concepts depending on the context, and there is no single universally accepted definition. The most common technical use appears in electrical engineering and power systems.

In electrical engineering, V_LL (often written as VLL) denotes the line-to-line voltage in a three-phase electrical system. It represents the potential difference between any two of the three phase conductors. For calculations, V_LL is related to the phase voltage V_L by the relation V_LL = sqrt(3) × V_L. Regional standards determine typical values; for example, European systems commonly use 400 V line-to-line (approximately 230 V phase voltage), while North American systems may use 480 V line-to-line (about 277 V phase voltage). Understanding V_LL is essential for selecting equipment, sizing transformers, and calculating power in three-phase networks.

Beyond power engineering, VLL is used in telecommunications to denote Virtual Leased Line, a service that provides dedicated-like connectivity over a shared network. This approach aims to combine the reliability and performance characteristics of a traditional leased line with potentially lower cost and greater flexibility, often implemented through MPLS or similar technologies and offered as point-to-point or multipoint connectivity with service-level agreements.

In other domains, VLL can appear as an acronym within specific projects, organizations, or documents, where its meaning is defined locally. As with many acronyms, the intended definition should be established by context and stated at the term’s first use in a given source.