
59-1
59.1 Introduction
A dramatic change is going on currently in the supply of electrical energy, generally called power supply.
In
former
times,
this
power
supply
was
mainly
provided
by
few
big
power
stations.
e
technology
of
the
automation
systems
in
such
power
stations
was
designated
by
a
few
big
enterprises.
ese
days
more
and
more
small
power
supplies
(DER—distributed
energy
resources)
like
wind
power
plants,
combined
heat
and
power,
hydropower
plants,
photovoltaic
systems,
fuel
cells,
and
others
are
being
implemented
everywhere.
e
devices
for
the
automation,
protection,
and
monitoring
of
the
distributed
energy
resources
are
develope ...