Speaker
Jose Gascon
(CERN)
Description
As a result of the construction of the LHC accelerator
and the consolidation of the other accelerators, the
electrical network at CERN has been under continuous
evolution. The new equipment and their requirements
have increased the complexity of the distribution
network.
Since 1993 several main substations have been
renovated while some others have remained unaltered.
New technologies have been recently developed and
electrical equipment installed, but their implementation
in the electrical network often results in incompatibilities
with older technologies.
The coordination between the operating protective
relays in the HV network (known as “selectivity”) has
been a major problem observed during recent
disturbances on the CERN electrical network.
Disturbances of this nature have become more and
more frequent and have demonstrated areas of the
CERN electrical network that are particularly susceptible
to selectivity issues. This indiscriminate feeder tripping
has resulted in power cuts to areas that have not been
directly involved in electrical faults and increased the
time for the reestablishment of the service.
This lecture reviews the present situation of the HV
network concerning protection selectivity and the
corrective actions to be undertaken since the last
serious event.
Author
Jose Gascon
(CERN)
