ZyXEL Communications PLA-470 V2 - V3.0.5 Przewodnik Instalacji Pobierz pdf (Strona 302)

•

Intervention on PLC devices by authorized people.

The authorizations for interventions on an electrical network (deenergized,

close or energized) are obtained via specific trainings and approvals by ad hoc bod-

ies.

Table 12.1 lists the various authorizations for the various classes of technical

parties intervening on an electrical network according to the work to be carried out.

The installation of telecommunications devices and more generally of electrical

devices on the infrastructure of a public electrical network also raises a number of

issues, in particular the following:

•

Power supply of the PLC devices (installation of a power supply meter, billing

of the PLC device power supply, and so forth).

•

Nondisturbed operation of the electrical network and of its controlling

devices.

•

Possible identification of the low throughput PLC networks existing on the

electrical network of the community electrical utility and of the location of

these devices (electrical substation, pylon, and so forth).

•

Possible coexistence of community PLC networks and of private home or cor-

porate PLC networks. This coexistence between PLC networks and therefore

between PLC technologies will be examined further in Chapter 13, which is

dedicated to hybrid networks.

Choosing Equipment and Technologies

The choice of the PLC devices for a community network is particularly important

insofar as the master-slave architecture required by this type of network makes it

necessary to use a PLC technology incompatible with other technologies.

The Opera (Open PLC Research Alliance) project did not result in the develop-

ment of a single PLC standard. Since the HomePlug alliance has not yet finalized in

June 2008 the HomePlug BPL (Broadband PowerLine) version dedicated to the PLC

networks of communities, the PLC technologies for the networks of communities

are specific to each manufacturer, even if some of them use HomePlug as a basis to

propose PLC products for the distribution networks of communities.

Therefore, it is important to compare the various technologies capable of satis-

fying the requirements of a master-slave architecture on the public electrical net-

work. For this purpose, Table 12.2 summarizes the advantages and disadvantages

of each PLC technology for a distribution network.

Implementation of a Communitywide PLC Network 283

Table 12.1 Electrical Authorizations

AUTHORIZATION DEENERGIZED CLOSENESS ENERGIZED

LV HV LV MV LV MV

Non-electrician B0 H0 BOV HOV — —

Executing electrician B1 H1 B1V H1V B1T H1T

Work manager B2 H2 B2V H2V B2T H2T

1 2 ... 297 298 299 300 301 302 303 304 305 306 307 ... 348 349

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