Conference,
DIRECT LIGHTNING STROKES INTO RADIO ANTENNA MASTS OF HIGH VOLTAGE SUBSTATIONS SIMULATION AND ESTIMATION OF RISKS
(1986)
Abstract
In the recent years the increasing
activity of thunderstorms in Austria has
caused many faults in public electricity
supply. Sometimes direct strokes into the
radio antenna mast of substations have
occurred. Because the radio antenna mast
is near the electric plant with the control-,
measuring- and supply lines and
computers, the direct strokes are responsible
for operating troubles.
The mentioned troubles caused the
Austrian Electricity Supply Board to make
extensive investigations in close co-operation
with the Technical Universities of
Vienna and Graz to improve the reliability
of the electric supply system.
For the simulation a current impulse
generator fed the current into the top of
the radio antenna mast. The electric circuit
was closed by return wires. The current
distribution in the earthing system
in the area of the electric plant was measured.
During this simulation it was possible
to make several additional earthing
measures and to check their efficiency.
Parallel to the practical measurements
theoretical studies are also very
important. This is to estimate risks for
existing substations as well as those in
the planning stage. It determines the
optimal position of the radio antenna
mast in a substation and carefully directs
the set-up arrangements to avoid undue
interferences.
