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.
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.
The advantages air cooling are:
• simplicity
• overload capability for short duty cycles
• permits converters installed where
cooling water not available.
All components are wired and the system
tested the works prior delivery which
considerably reduces the time required for
erection and commissioning site.
This method suitable plants with
clean air conditions.
This method necessary plants with
dusty and/or aggressive atmospheres.
11
. cooling water pipes have be
disconnected drained order replace
a thyristor. The
air the closed cooling circuit cooled
by air-to-air air-to-water heat
exchanger.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. This method necessary for high
power applications and plants with dusty
and/or aggressive atmospheres. Circulation
pump, monitoring devices for flow, temperature
and conductivity are part the converter
assembly
