ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 295)

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Network topology;

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Distance between pylons;

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Distance between the transformer and the various meters that it supplies;

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Number of meters behind a MV/LV distribution transformer.

For each of these networks, three MV electrical network topologies are possible:

star, ring, or mesh topologies. The most widespread topology is the mesh topology,

which has the advantage of protecting the entire electrical network against possible

electrical defects at some points of the network. If a defect, like a short circuit, weak-

ens the network at a point, other electrical lines take over since the topology pro-

vides backup links due to meshing. No point of the electrical network is supplied by

a single electrical line.

Topology of MV Networks

In rural areas, the star topology of the “tree” type is widespread. In semiurban areas,

star topologies of the “tree” type and ring topologies are found with several high

voltage network connection points.

In dense urban areas, the widespread topology is the mesh topology, but it oper-

ates as an energized star configuration. The mesh links are backup links should one

of the main links be cut.

Figures 12.4 to 12.6 illustrate these various MV network topologies.

Topology of LV Networks

In most countries, the topology of LV electrical networks is a star topology of the

tree type allowing links in this way by meshing between certain branches of the elec-

trical network. However, these mesh links are still too rare to define the network

topology as an actual mesh.

276 PLC for Communities

Figure 12.4 Star topology

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 295