The
air the closed cooling circuit cooled
by air-to-air air-to-water heat
exchanger. Circulation
pump, monitoring devices for flow, temperature
and conductivity are part the converter
assembly.
This method suitable plants with
clean air conditions.Efficient cooling means
higher reliability
Air-cooling
• Open-circuit:
Fans force the cooling air through the
thyristor heat sinks.
• Closed-circuit:
The cooling air circulates closed
circuit inside the converter cubicles.
The advantages water cooling are:
• space-saving layout
• losses easily conveyed from control room
• higher ambient temperature permissible
• less noise
• fully enclosed cubicle with protection
class IP55 (protection against dust
and splash water) for noise reduction and
severe ambient conditions available
Air-cooled
MEGADRIVE-LCI driving
a boiler feed pump a
nuclear power plant
Rated power: 3.4 MW
Operating
mode: 12/12-pulse
Walk-in enclosure
For outdoor erection, the converter complete
with auxiliaries, switchgear, reactors and air-
conditioning plant can installed fully
sealed enclosure which can supplied for
varying severities ambient conditions.
Water-cooling
Deionised water flows closed-circuit
through the thyristor heat sinks and around
the snubber circuit resistors and cooled by
either water-to-water water-to-air heat
exchanger. This method necessary for high
power applications and plants with dusty
and/or aggressive atmospheres.
This method necessary plants with
dusty and/or aggressive atmospheres.
All components are wired and the system
tested the works prior delivery which
considerably reduces the time required for
erection and commissioning site.
11
.
The advantages air cooling are:
• simplicity
• overload capability for short duty cycles
• permits converters installed where
cooling water not available. cooling water pipes have be
disconnected drained order replace
a thyristor
