IEEE Power & Energy Magazine - March/April 2018 - 64

SF6 Monitoring
in CB

<>
Blocaux
225/90/20 kV

Switchgear Monitoring +
SCU + Switch Cabinet

Wind Farms (Far Away)
Disconnector
Monitoring

LPIT CT + VT

Transformer
Monitoring + BCU +
Switch Cabinet

MU/SAMU +
Switch
Cabinet
Lithium Ion Auxiliary
Units (+ DSAS Backup)

figure 8. New devices in the Blocaux smart substation. SCU: SAS control unit; BCU: basic control unit; MU: merging
unit; SAMU: stand-along MU; DSAS: digital SAS. (Photo courtesy of RTE, used with permission.)

computation results could be performed and sent with the
actual values to the control centers.
in the Poste intelligent/smart substation project, we have
experimented with a new functional design: all the protection is stored in the same cubicle instead of our traditional
feeder-oriented design of cubicles. This enables the possibility of connecting a hot spare intelligent electronic device
(ieD), such as a protection function, that can replace any
faulty one upon request. The final aim is to obtain a selfhealing or n-1 failure-resilient protection function, giving
more time for maintenance personnel to intervene. The obvious drawback is the complexity and difficulty of identifying the faulted equipment. an identification aid has to be
provided (with light-emitting diodes, for instance). maintenance feedback has to be taken into account. This might
lead, in the future, to a certain level of virtualization of some
equipment in the same box.
To summarize, the main advantages of the full digitalization of the data collected are
✔ higher data refresh time
✔ more precise measurements
64

ieee power & energy magazine

✔ better dynamic filtering and lower electromagnetic

disturbances on low power wires
✔ higher data redundancy
✔ more precise time accuracy and thus sequencing of
data and events
✔ compliance with standards, thus a consistency of data
models, and a certain level of interoperability between
equipment from different vendors.
Full digitalization also provides a safer way for maintenance
as fiber optics replace copper cables, fewer auxiliary units
(e.g., diesel generators or batteries) are needed, and the choice
to organize the design (i.e., centralized or not, integrated or
not) is more open to the Tso needs. additional expected
advantages include a potential reduction in spatial and environmental footprint at a lower cost. since this is the first trial,
the results will require further examination and adjustments
to designs.
Caution is needed, however. Time synchronization is difficult to achieve, and there needs to be a careful design and
commissioning. Data models are more complex and must be
Tso oriented (and not vendor oriented). new commissioning
march/april 2018



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2018

Contents
IEEE Power & Energy Magazine - March/April 2018 - Cover1
IEEE Power & Energy Magazine - March/April 2018 - Cover2
IEEE Power & Energy Magazine - March/April 2018 - Contents
IEEE Power & Energy Magazine - March/April 2018 - 2
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IEEE Power & Energy Magazine - March/April 2018 - Cover3
IEEE Power & Energy Magazine - March/April 2018 - Cover4
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